Merge branch 'rolling' into reorganize-code-and-restructure-the-codebase

.gitignore

@@ -4,3 +4,4 @@ package-lock.json
 dump.rdb
 .vscode
 megalinter-reports/
+dhat-heap.json

Cargo.lock

@@ -9,7 +9,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "617a8268e3537fe1d8c9ead925fca49ef6400927ee7bc26750e90ecee14ce4b8"
 dependencies = [
  "bitflags 1.3.2",
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "futures-core",
  "futures-sink",
  "memchr",
@@ -46,7 +46,7 @@ dependencies = [
  "actix-web",
  "askama_escape",
  "bitflags 1.3.2",
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "derive_more",
  "futures-core",
  "http-range",
@@ -57,6 +57,18 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "actix-governor"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46ff2d40f2bc627b8054c5e20fa6b0b0cf9428699b54bd41634e9ae3098ad555"
+dependencies = [
+ "actix-http",
+ "actix-web",
+ "futures 0.3.28",
+ "governor",
+]
+
 [[package]]
 name = "actix-http"
 version = "3.4.0"
@@ -68,10 +80,10 @@ dependencies = [
  "actix-service",
  "actix-utils",
  "ahash",
- "base64 0.21.3",
+ "base64 0.21.4",
  "bitflags 2.4.0",
  "brotli",
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "bytestring",
  "derive_more",
  "encoding_rs",
@@ -103,7 +115,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e01ed3140b2f8d422c68afa1ed2e85d996ea619c988ac834d255db32138655cb"
 dependencies = [
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -183,7 +195,7 @@ dependencies = [
  "actix-utils",
  "actix-web-codegen",
  "ahash",
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "bytestring",
  "cfg-if 1.0.0",
  "cookie 0.16.2",
@@ -216,7 +228,7 @@ dependencies = [
  "actix-router",
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -278,9 +290,9 @@ checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
 [[package]]
 name = "anstyle"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15c4c2c83f81532e5845a733998b6971faca23490340a418e9b72a3ec9de12ea"
+checksum = "b84bf0a05bbb2a83e5eb6fa36bb6e87baa08193c35ff52bbf6b38d8af2890e46"
 
 [[package]]
 name = "anyhow"
@@ -288,12 +300,24 @@ version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
 
+[[package]]
+name = "arc-swap"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bddcadddf5e9015d310179a59bb28c4d4b9920ad0f11e8e14dbadf654890c9a6"
+
 [[package]]
 name = "askama_escape"
 version = "0.10.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "619743e34b5ba4e9703bba34deac3427c72507c7159f5fd030aea8cac0cfe341"
 
+[[package]]
+name = "async-once-cell"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9338790e78aa95a416786ec8389546c4b6a1dfc3dc36071ed9518a9413a542eb"
+
 [[package]]
 name = "async-trait"
 version = "0.1.73"
@@ -302,7 +326,7 @@ checksum = "bc00ceb34980c03614e35a3a4e218276a0a824e911d07651cd0d858a51e8c0f0"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -346,9 +370,9 @@ dependencies = [
 
 [[package]]
 name = "base64"
-version = "0.21.3"
+version = "0.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "414dcefbc63d77c526a76b3afcf6fbb9b5e2791c19c3aa2297733208750c6e53"
+checksum = "9ba43ea6f343b788c8764558649e08df62f86c6ef251fdaeb1ffd010a9ae50a2"
 
 [[package]]
 name = "bit-set"
@@ -441,9 +465,9 @@ dependencies = [
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "bytestring"
@@ -451,7 +475,7 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "238e4886760d98c4f899360c834fa93e62cf7f721ac3c2da375cbdf4b8679aae"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
 ]
 
 [[package]]
@@ -558,8 +582,12 @@ version = "4.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "35ed6e9d84f0b51a7f52daf1c7d71dd136fd7a3f41a8462b8cdb8c78d920fad4"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
+ "futures-core",
  "memchr",
+ "pin-project-lite",
+ "tokio 1.32.0",
+ "tokio-util",
 ]
 
 [[package]]
@@ -574,7 +602,7 @@ version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "888604f00b3db336d2af898ec3c1d5d0ddf5e6d462220f2ededc33a87ac4bbd5"
 dependencies = [
- "time 0.1.45",
+ "time 0.1.43",
  "url 1.7.2",
 ]
 
@@ -602,7 +630,7 @@ dependencies = [
  "publicsuffix",
  "serde",
  "serde_json",
- "time 0.1.45",
+ "time 0.1.43",
  "try_from",
  "url 1.7.2",
 ]
@@ -798,7 +826,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13b588ba4ac1a99f7f2964d24b3d896ddc6bf847ee3855dbd4366f058cfcd331"
 dependencies = [
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
+]
+
+[[package]]
+name = "dashmap"
+version = "5.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978747c1d849a7d2ee5e8adc0159961c48fb7e5db2f06af6723b80123bb53856"
+dependencies = [
+ "cfg-if 1.0.0",
+ "hashbrown 0.14.0",
+ "lock_api 0.4.10",
+ "once_cell",
+ "parking_lot_core 0.9.8",
 ]
 
 [[package]]
@@ -820,6 +861,22 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "dhat"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f2aaf837aaf456f6706cb46386ba8dffd4013a757e36f4ea05c20dd46b209a3"
+dependencies = [
+ "backtrace",
+ "lazy_static",
+ "mintex",
+ "parking_lot 0.12.1",
+ "rustc-hash",
+ "serde",
+ "serde_json",
+ "thousands",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -918,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "error-stack"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6a37ef405b504fc3b87a24fa52906d98cdd1a7d4e5ef2b49f0d5fead138fced"
+checksum = "27a72baa257b5e0e2de241967bc5ee8f855d6072351042688621081d66b2a76b"
 dependencies = [
  "anyhow",
  "rustc_version 0.4.0",
@@ -1049,6 +1106,21 @@ version = "0.1.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a471a38ef8ed83cd6e40aa59c1ffe17db6855c18e3604d9c4ed8c08ebc28678"
 
+[[package]]
+name = "futures"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.28"
@@ -1056,6 +1128,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "955518d47e09b25bbebc7a18df10b81f0c766eaf4c4f1cccef2fca5f2a4fb5f2"
 dependencies = [
  "futures-core",
+ "futures-sink",
 ]
 
 [[package]]
@@ -1070,10 +1143,38 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"
 dependencies = [
- "futures",
+ "futures 0.1.31",
  "num_cpus",
 ]
 
+[[package]]
+name = "futures-executor"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccecee823288125bd88b4d7f565c9e58e41858e47ab72e8ea2d64e93624386e0"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fff74096e71ed47f8e023204cfd0aa1289cd54ae5430a9523be060cdb849964"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
+dependencies = [
+ "proc-macro2 1.0.66",
+ "quote 1.0.33",
+ "syn 2.0.32",
+]
+
 [[package]]
 name = "futures-sink"
 version = "0.3.28"
@@ -1086,16 +1187,28 @@ version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76d3d132be6c0e6aa1534069c705a74a5997a356c0dc2f86a47765e5617c5b65"
 
+[[package]]
+name = "futures-timer"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
+
 [[package]]
 name = "futures-util"
 version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26b01e40b772d54cf6c6d721c1d1abd0647a0106a12ecaa1c186273392a69533"
 dependencies = [
+ "futures-channel",
  "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
  "futures-task",
+ "memchr",
  "pin-project-lite",
  "pin-utils",
+ "slab",
 ]
 
 [[package]]
@@ -1143,6 +1256,24 @@ version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fb8d784f27acf97159b40fc4db5ecd8aa23b9ad5ef69cdd136d3bc80665f0c0"
 
+[[package]]
+name = "governor"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c390a940a5d157878dd057c78680a33ce3415bcd05b4799509ea44210914b4d5"
+dependencies = [
+ "cfg-if 1.0.0",
+ "dashmap",
+ "futures 0.3.28",
+ "futures-timer",
+ "no-std-compat",
+ "nonzero_ext",
+ "parking_lot 0.12.1",
+ "quanta",
+ "rand 0.8.5",
+ "smallvec 1.11.0",
+]
+
 [[package]]
 name = "h2"
 version = "0.1.26"
@@ -1152,7 +1283,7 @@ dependencies = [
  "byteorder",
  "bytes 0.4.12",
  "fnv",
- "futures",
+ "futures 0.1.31",
  "http 0.1.21",
  "indexmap",
  "log",
@@ -1167,7 +1298,7 @@ version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "91fc23aa11be92976ef4729127f1a74adf36d8436f7816b185d18df956790833"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "fnv",
  "futures-core",
  "futures-sink",
@@ -1207,6 +1338,12 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
+[[package]]
+name = "hashbrown"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+
 [[package]]
 name = "hermit-abi"
 version = "0.3.2"
@@ -1258,7 +1395,7 @@ version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd6effc99afb63425aff9b05836f029929e345a6148a14b7ecd5ab67af944482"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "fnv",
  "itoa 1.0.9",
 ]
@@ -1270,7 +1407,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6741c859c1b2463a423a1dbce98d418e6c3c3fc720fb0d45528657320920292d"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "http 0.1.21",
  "tokio-buf",
 ]
@@ -1281,7 +1418,7 @@ version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d5f38f16d184e36f2408a55281cd658ecbd3ca05cce6d6510a176eca393e26d1"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "http 0.2.9",
  "pin-project-lite",
 ]
@@ -1317,7 +1454,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c843caf6296fc1f93444735205af9ed4e109a539005abb2564ae1d6fad34c52"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "futures-cpupool",
  "h2 0.1.26",
  "http 0.1.21",
@@ -1328,7 +1465,7 @@ dependencies = [
  "log",
  "net2",
  "rustc_version 0.2.3",
- "time 0.1.45",
+ "time 0.1.43",
  "tokio 0.1.22",
  "tokio-buf",
  "tokio-executor",
@@ -1346,7 +1483,7 @@ version = "0.14.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ffb1cfd654a8219eaef89881fdb3bb3b1cdc5fa75ded05d6933b2b382e395468"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "futures-channel",
  "futures-core",
  "futures-util",
@@ -1371,7 +1508,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a800d6aa50af4b5850b2b0f659625ce9504df908e9733b635720483be26174f"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "hyper 0.12.36",
  "native-tls",
  "tokio-io",
@@ -1383,7 +1520,7 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d6183ddfa99b85da61a140bea0efc93fdf56ceaa041b37d553518030827f9905"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "hyper 0.14.27",
  "native-tls",
  "tokio 1.32.0",
@@ -1429,7 +1566,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
 dependencies = [
  "autocfg 1.1.0",
- "hashbrown",
+ "hashbrown 0.12.3",
 ]
 
 [[package]]
@@ -1525,11 +1662,21 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25d058a81af0d1c22d7a1c948576bee6d673f7af3c0f35564abd6c81122f513d"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "linux-raw-sys"
-version = "0.4.5"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57bcfdad1b858c2db7c38303a6d2ad4dfaf5eb53dfeb0910128b2c26d6158503"
+checksum = "1a9bad9f94746442c783ca431b22403b519cd7fbeed0533fdd6328b2f2212128"
 
 [[package]]
 name = "local-channel"
@@ -1580,6 +1727,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
+[[package]]
+name = "mach"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b823e83b2affd8f40a9ee8c29dbc56404c1e34cd2710921f2801e2cf29527afa"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "markup5ever"
 version = "0.8.1"
@@ -1653,6 +1809,15 @@ dependencies = [
  "autocfg 1.1.0",
 ]
 
+[[package]]
+name = "mimalloc"
+version = "0.1.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "972e5f23f6716f62665760b0f4cbf592576a80c7b879ba9beaafc0e558894127"
+dependencies = [
+ "libmimalloc-sys",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -1678,6 +1843,16 @@ dependencies = [
  "adler",
 ]
 
+[[package]]
+name = "mintex"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd7c5ba1c3b5a23418d7bbf98c71c3d4946a0125002129231da8d6b723d559cb"
+dependencies = [
+ "once_cell",
+ "sys-info",
+]
+
 [[package]]
 name = "mio"
 version = "0.6.23"
@@ -1721,6 +1896,20 @@ dependencies = [
  "ws2_32-sys",
 ]
 
+[[package]]
+name = "mlua"
+version = "0.8.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bb37b0ba91f017aa7ca2b98ef99496827770cd635b4a932a6047c5b4bbe678e"
+dependencies = [
+ "bstr",
+ "cc",
+ "num-traits",
+ "once_cell",
+ "pkg-config",
+ "rustc-hash",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.11"
@@ -1762,6 +1951,18 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab250442c86f1850815b5d268639dff018c0627022bc1940eb2d642ca1ce12f0"
 
+[[package]]
+name = "no-std-compat"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b93853da6d84c2e3c7d730d6473e8817692dd89be387eb01b94d7f108ecb5b8c"
+
+[[package]]
+name = "nonzero_ext"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
+
 [[package]]
 name = "num-traits"
 version = "0.2.16"
@@ -1825,7 +2026,7 @@ checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -1836,9 +2037,9 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.92"
+version = "0.9.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db7e971c2c2bba161b2d2fdf37080177eff520b3bc044787c7f1f5f9e78d869b"
+checksum = "db4d56a4c0478783083cfafcc42493dd4a981d41669da64b4572a2a089b51b1d"
 dependencies = [
  "cc",
  "libc",
@@ -1944,7 +2145,7 @@ dependencies = [
  "pest_meta",
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -2046,7 +2247,7 @@ dependencies = [
  "phf_shared 0.11.2",
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -2076,6 +2277,26 @@ dependencies = [
  "siphasher 0.3.11",
 ]
 
+[[package]]
+name = "pin-project"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fda4ed1c6c173e3fc7a83629421152e01d7b1f9b7f65fb301e490e8cfc656422"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
+dependencies = [
+ "proc-macro2 1.0.66",
+ "quote 1.0.33",
+ "syn 2.0.32",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.13"
@@ -2162,6 +2383,22 @@ dependencies = [
  "url 2.4.1",
 ]
 
+[[package]]
+name = "quanta"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20afe714292d5e879d8b12740aa223c6a88f118af41870e8b6196e39a02238a8"
+dependencies = [
+ "crossbeam-utils 0.8.16",
+ "libc",
+ "mach",
+ "once_cell",
+ "raw-cpuid",
+ "wasi 0.10.2+wasi-snapshot-preview1",
+ "web-sys",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "quote"
 version = "0.6.13"
@@ -2316,6 +2553,15 @@ dependencies = [
  "rand_core 0.3.1",
 ]
 
+[[package]]
+name = "raw-cpuid"
+version = "10.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c297679cb867470fa8c9f67dbba74a78d78e3e98d7cf2b08d6d71540f797332"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
 [[package]]
 name = "rayon"
 version = "1.7.0"
@@ -2353,12 +2599,21 @@ version = "0.23.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f49cdc0bb3f412bf8e7d1bd90fe1d9eb10bc5c399ba90973c14662a27b3f8ba"
 dependencies = [
+ "arc-swap",
+ "async-trait",
+ "bytes 1.5.0",
  "combine",
+ "futures 0.3.28",
+ "futures-util",
  "itoa 1.0.9",
  "percent-encoding 2.3.0",
+ "pin-project-lite",
  "ryu",
  "sha1_smol",
  "socket2 0.4.9",
+ "tokio 1.32.0",
+ "tokio-retry",
+ "tokio-util",
  "url 2.4.1",
 ]
 
@@ -2418,7 +2673,7 @@ dependencies = [
  "cookie_store",
  "encoding_rs",
  "flate2",
- "futures",
+ "futures 0.1.31",
  "http 0.1.21",
  "hyper 0.12.36",
  "hyper-tls 0.3.2",
@@ -2429,7 +2684,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_urlencoded 0.5.5",
- "time 0.1.45",
+ "time 0.1.43",
  "tokio 0.1.22",
  "tokio-executor",
  "tokio-io",
@@ -2446,8 +2701,8 @@ version = "0.11.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e9ad3fe7488d7e34558a2033d45a0c90b72d97b4f80705666fea71472e2e6a1"
 dependencies = [
- "base64 0.21.3",
- "bytes 1.4.0",
+ "base64 0.21.4",
+ "bytes 1.5.0",
  "encoding_rs",
  "futures-core",
  "futures-util",
@@ -2477,36 +2732,18 @@ dependencies = [
  "winreg 0.50.0",
 ]
 
-[[package]]
-name = "rlua"
-version = "0.19.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d33e5ba15c3d43178f283ed5863d4531e292fc0e56fb773f3bea45f18e3a42a"
-dependencies = [
- "bitflags 1.3.2",
- "bstr",
- "libc",
- "num-traits",
- "rlua-lua54-sys",
-]
-
-[[package]]
-name = "rlua-lua54-sys"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7aafabafe1895cb4a2be81a56d7ff3d46bf4b5d2f9cfdbea2ed404cdabe96474"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
-]
-
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -2527,9 +2764,9 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "0.38.11"
+version = "0.38.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0c3dde1fc030af041adc40e79c0e7fbcf431dd24870053d187d7c66e4b87453"
+checksum = "d7db8590df6dfcd144d22afd1b83b36c21a18d7cbc1dc4bb5295a8712e9eb662"
 dependencies = [
  "bitflags 2.4.0",
  "errno",
@@ -2687,14 +2924,14 @@ checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.105"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "693151e1ac27563d6dbcec9dee9fbd5da8539b20fa14ad3752b2e6d363ace360"
+checksum = "2cc66a619ed80bf7a0f6b17dd063a84b88f6dea1813737cf469aef1d081142c2"
 dependencies = [
  "itoa 1.0.9",
  "ryu",
@@ -2806,6 +3043,9 @@ name = "smallvec"
 version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "socket2"
@@ -2926,9 +3166,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.31"
+version = "2.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "718fa2415bcb8d8bd775917a1bf12a7931b6dfa890753378538118181e0cb398"
+checksum = "239814284fd6f1a4ffe4ca893952cdd93c224b6a1571c9a9eadd670295c0c9e2"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
@@ -2947,6 +3187,16 @@ dependencies = [
  "unicode-xid 0.2.4",
 ]
 
+[[package]]
+name = "sys-info"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b3a0d0aba8bf96a0e1ddfdc352fc53b3df7f39318c71854910c3c4b024ae52c"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.8.0"
@@ -2997,17 +3247,22 @@ checksum = "49922ecae66cc8a249b77e68d1d0623c1b2c514f0060c27cdc68bd62a1219d35"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
+[[package]]
+name = "thousands"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bf63baf9f5039dadc247375c29eb13706706cfde997d0330d05aa63a77d8820"
+
 [[package]]
 name = "time"
-version = "0.1.45"
+version = "0.1.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b797afad3f312d1c66a56d11d0316f916356d11bd158fbc6ca6389ff6bf805a"
+checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
 dependencies = [
  "libc",
- "wasi 0.10.0+wasi-snapshot-preview1",
  "winapi 0.3.9",
 ]
 
@@ -3071,7 +3326,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "mio 0.6.23",
  "num_cpus",
  "tokio-current-thread",
@@ -3090,7 +3345,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17ed6077ed6cd6c74735e21f37eb16dc3935f96878b1fe961074089cc80893f9"
 dependencies = [
  "backtrace",
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "libc",
  "mio 0.8.8",
  "num_cpus",
@@ -3110,7 +3365,7 @@ checksum = "8fb220f46c53859a4b7ec083e41dec9778ff0b1851c0942b211edb89e0ccdc46"
 dependencies = [
  "bytes 0.4.12",
  "either",
- "futures",
+ "futures 0.1.31",
 ]
 
 [[package]]
@@ -3119,7 +3374,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1de0e32a83f131e002238d7ccde18211c0a5397f60cbfffcb112868c2e0e20e"
 dependencies = [
- "futures",
+ "futures 0.1.31",
  "tokio-executor",
 ]
 
@@ -3130,7 +3385,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fb2d1b8f4548dbf5e1f7818512e9c406860678f29c300cdf0ebac72d1a3a1671"
 dependencies = [
  "crossbeam-utils 0.7.2",
- "futures",
+ "futures 0.1.31",
 ]
 
 [[package]]
@@ -3140,7 +3395,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57fc868aae093479e3131e3d165c93b1c7474109d13c90ec0dda2a1bbfff0674"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "log",
 ]
 
@@ -3152,7 +3407,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
 ]
 
 [[package]]
@@ -3172,7 +3427,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09bc590ec4ba8ba87652da2068d150dcada2cfa2e07faae270a5e0409aa51351"
 dependencies = [
  "crossbeam-utils 0.7.2",
- "futures",
+ "futures 0.1.31",
  "lazy_static",
  "log",
  "mio 0.6.23",
@@ -3184,6 +3439,17 @@ dependencies = [
  "tokio-sync",
 ]
 
+[[package]]
+name = "tokio-retry"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f57eb36ecbe0fc510036adff84824dd3c24bb781e21bfa67b69d556aa85214f"
+dependencies = [
+ "pin-project",
+ "rand 0.8.5",
+ "tokio 1.32.0",
+]
+
 [[package]]
 name = "tokio-sync"
 version = "0.1.8"
@@ -3191,7 +3457,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "edfe50152bc8164fcc456dab7891fa9bf8beaf01c5ee7e1dd43a397c3cf87dee"
 dependencies = [
  "fnv",
- "futures",
+ "futures 0.1.31",
 ]
 
 [[package]]
@@ -3201,7 +3467,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98df18ed66e3b72e742f185882a9e201892407957e45fbff8da17ae7a7c51f72"
 dependencies = [
  "bytes 0.4.12",
- "futures",
+ "futures 0.1.31",
  "iovec",
  "mio 0.6.23",
  "tokio-io",
@@ -3217,7 +3483,7 @@ dependencies = [
  "crossbeam-deque 0.7.4",
  "crossbeam-queue",
  "crossbeam-utils 0.7.2",
- "futures",
+ "futures 0.1.31",
  "lazy_static",
  "log",
  "num_cpus",
@@ -3232,7 +3498,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "93044f2d313c95ff1cb7809ce9a7a05735b012288a888b62d4434fd58c94f296"
 dependencies = [
  "crossbeam-utils 0.7.2",
- "futures",
+ "futures 0.1.31",
  "slab",
  "tokio-executor",
 ]
@@ -3243,7 +3509,7 @@ version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "806fe8c2c87eccc8b3267cbae29ed3ab2d0bd37fca70ab622e46aaa9375ddb7d"
 dependencies = [
- "bytes 1.4.0",
+ "bytes 1.5.0",
  "futures-core",
  "futures-sink",
  "pin-project-lite",
@@ -3413,9 +3679,9 @@ checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
 [[package]]
 name = "walkdir"
-version = "2.3.3"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36df944cda56c7d8d8b7496af378e6b16de9284591917d307c9b4d313c44e698"
+checksum = "d71d857dc86794ca4c280d616f7da00d2dbfd8cd788846559a6813e6aa4b54ee"
 dependencies = [
  "same-file",
  "winapi-util",
@@ -3427,7 +3693,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6395efa4784b027708f7451087e647ec73cc74f5d9bc2e418404248d679a230"
 dependencies = [
- "futures",
+ "futures 0.1.31",
  "log",
  "try-lock",
 ]
@@ -3443,9 +3709,9 @@ dependencies = [
 
 [[package]]
 name = "wasi"
-version = "0.10.0+wasi-snapshot-preview1"
+version = "0.10.2+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
 
 [[package]]
 name = "wasi"
@@ -3474,7 +3740,7 @@ dependencies = [
  "once_cell",
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
  "wasm-bindgen-shared",
 ]
 
@@ -3508,7 +3774,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2 1.0.66",
  "quote 1.0.33",
- "syn 2.0.31",
+ "syn 2.0.32",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -3535,25 +3801,31 @@ version = "0.20.2"
 dependencies = [
  "actix-cors",
  "actix-files",
+ "actix-governor",
  "actix-web",
+ "async-once-cell",
  "async-trait",
  "criterion",
+ "dhat",
  "env_logger",
  "error-stack",
  "fake-useragent",
+ "futures 0.3.28",
  "handlebars",
  "log",
  "md5",
+ "mimalloc",
+ "mlua",
  "once_cell",
  "rand 0.8.5",
  "redis",
  "regex",
  "reqwest 0.11.20",
- "rlua",
  "rusty-hook",
  "scraper",
  "serde",
  "serde_json",
+ "smallvec 1.11.0",
  "tempfile",
  "tokio 1.32.0",
 ]

Cargo.toml

@@ -8,9 +8,9 @@ license = "AGPL-3.0"
 
 [dependencies]
 reqwest = {version="0.11.20",features=["json"]}
-tokio = {version="1.32.0",features=["full"]}
+tokio = {version="1.32.0",features=["rt-multi-thread","macros"]}
 serde = {version="1.0.188",features=["derive"]}
-handlebars = { version = "4.3.7", features = ["dir_source"] }
+handlebars = { version = "4.4.0", features = ["dir_source"] }
 scraper = {version="0.17.1"}
 actix-web = {version="4.4.0", features = ["cookies"]}
 actix-files = {version="0.6.2"}
@@ -19,14 +19,20 @@ serde_json = {version="1.0.105"}
 fake-useragent = {version="0.1.3"}
 env_logger = {version="0.10.0"}
 log = {version="0.4.20"}
-rlua = {version="0.19.7"}
-redis = {version="0.23.2"}
+mlua = {version="0.8.10", features=["luajit"]}
+redis = {version="0.23.3", features=["tokio-comp","connection-manager"]}
 md5 = {version="0.7.0"}
 rand={version="0.8.5"}
 once_cell = {version="1.18.0"}
 error-stack = {version="0.4.0"}
 async-trait = {version="0.1.73"}
 regex = {version="1.9.4", features=["perf"]}
+smallvec = {version="1.11.0", features=["union", "serde"]}
+futures = {version="0.3.28"}
+dhat = {version="0.3.2", optional = true}
+mimalloc = { version = "0.1.38", default-features = false }
+async-once-cell = {version="0.5.3"}
+actix-governor = {version="0.4.1"}
 
 [dev-dependencies]
 rusty-hook = "^0.11.2"
@@ -47,13 +53,17 @@ rpath = false
 
 [profile.release]
 opt-level = 3
-debug = false
+debug = false # This should only be commented when testing with dhat profiler
+# debug = 1 # This should only be uncommented when testing with dhat profiler
 split-debuginfo = '...'
 debug-assertions = false
 overflow-checks = false
-lto = 'thin'
+lto = true
 panic = 'abort'
 incremental = false
-codegen-units = 16
+codegen-units = 1
 rpath = false
 strip = "debuginfo"
+
+[features]
+dhat-heap = ["dep:dhat"] 

Dockerfile

@@ -19,7 +19,7 @@ COPY . .
 RUN cargo install --path .
 
 # We do not need the Rust toolchain to run the binary!
-FROM gcr.io/distroless/cc-debian11
+FROM gcr.io/distroless/cc-debian12
 COPY --from=builder /app/public/ /opt/websurfx/public/
 COPY --from=builder /app/websurfx/config.lua /etc/xdg/websurfx/config.lua
 COPY --from=builder /usr/local/cargo/bin/* /usr/local/bin/

README.md

@@ -5,7 +5,7 @@
   <b align="center"><a href="README.md">Readme</a></b> |
   <b><a href="https://discord.gg/SWnda7Mw5u">Discord</a></b> |
   <b><a href="https://github.com/neon-mmd/websurfx">GitHub</a></b> |
-  <b><a href="./docs/README.md">Documentation</a></b>
+  <b><a href="../../tree/HEAD/docs/">Documentation</a></b>
   <br /><br />
   <a href="#">
     <img
@@ -51,7 +51,7 @@
 - **Getting Started**
     - [🔭 Preview](#preview-)
     - [🚀 Features](#features-)
-    - [🛠️ Installation and Testing](#installation-and-testing-)
+    - [🛠️ Installation and Testing](#installation-and-testing-%EF%B8%8F)
     - [🔧 Configuration](#configuration-)
 - **Feature Overview**
     - [🎨 Theming](#theming-)

docs/installation.md

@@ -109,7 +109,7 @@ colorscheme = "catppuccin-mocha" -- the colorscheme name which should be used fo
 theme = "simple" -- the theme name which should be used for the website
 
 -- ### Caching ###
-redis_connection_url = "redis://redis:6379" -- redis connection url address on which the client should connect on.
+redis_url = "redis://redis:6379" -- redis connection url address on which the client should connect on.
 
 -- ### Search Engines ###
 upstream_search_engines = { DuckDuckGo = true, Searx = false } -- select the upstream search engines from which the results should be fetched.

public/static/themes/simple.css

@@ -132,6 +132,35 @@ body {
   width: 1.2rem;
   height: 1.2rem;
 }
+.results .result_disallowed,
+.results .result_filtered {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  gap: 10rem;
+  font-size: 2rem;
+  color: var(--foreground-color);
+  margin: 0rem 7rem;
+}
+
+.results .result_disallowed .user_query,
+.results .result_filtered .user_query {
+  color: var(--background-color);
+  font-weight: 300;
+}
+
+.results .result_disallowed img,
+.results .result_filtered img {
+  width: 30rem;
+}
+
+.results .result_disallowed div,
+.results .result_filtered div {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  line-break: strict;
+}
 
 /* styles for the footer and header */
 

public/templates/search.html

@@ -1,37 +1,69 @@
 {{>header this.style}}
 <main class="results">
-  {{>search_bar this}}
-  <div class="results_aggregated">
-    {{#if results}} {{#each results}}
-    <div class="result">
-      <h1><a href="{{{this.url}}}">{{{this.title}}}</a></h1>
-      <small>{{{this.url}}}</small>
-      <p>{{{this.description}}}</p>
-      <div class="upstream_engines">
-        {{#each engine}}
-        <span>{{{this}}}</span>
-        {{/each}}
-      </div>
+    {{>search_bar this}}
+    <div class="results_aggregated">
+        {{#if results}} {{#each results}}
+        <div class="result">
+            <h1><a href="{{{this.url}}}">{{{this.title}}}</a></h1>
+            <small>{{{this.url}}}</small>
+            <p>{{{this.description}}}</p>
+            <div class="upstream_engines">
+                {{#each engine}}
+                <span>{{{this}}}</span>
+                {{/each}}
+            </div>
+        </div>
+        {{/each}} {{else}} {{#if disallowed}}
+        <div class="result_disallowed">
+            <div class="description">
+                <p>
+                    Your search - <span class="user_query">{{{this.pageQuery}}}</span> -
+                    has been disallowed.
+                </p>
+                <p class="description_paragraph">Dear user,</p>
+                <p class="description_paragraph">
+                    The query - <span class="user_query">{{{this.pageQuery}}}</span> - has
+                    been blacklisted via server configuration and hence disallowed by the
+                    server. Henceforth no results could be displayed for your query.
+                </p>
+            </div>
+            <img src="./images/barricade.png" alt="Image of a Barricade" />
+        </div>
+        {{else}} {{#if filtered}}
+        <div class="result_filtered">
+            <div class="description">
+                <p>
+                    Your search - <span class="user_query">{{{this.pageQuery}}}</span> -
+                    has been filtered.
+                </p>
+                <p class="description_paragraph">Dear user,</p>
+                <p class="description_paragraph">
+                    All the search results contain results that has been configured to be
+                    filtered out via server configuration and henceforth has been
+                    completely filtered out.
+                </p>
+            </div>
+            <img src="./images/filter.png" alt="Image of a paper inside a funnel" />
+        </div>
+        {{else}}
+        <div class="result_not_found">
+            <p>Your search - {{{this.pageQuery}}} - did not match any documents.</p>
+            <p class="suggestions">Suggestions:</p>
+            <ul>
+                <li>Make sure that all words are spelled correctly.</li>
+                <li>Try different keywords.</li>
+                <li>Try more general keywords.</li>
+            </ul>
+            <img src="./images/no_results.gif" alt="Man fishing gif" />
+        </div>
+        {{/if}} {{/if}} {{/if}}
     </div>
-    {{/each}} {{else}}
-    <div class="result_not_found">
-      <p>Your search - {{{this.pageQuery}}} - did not match any documents.</p>
-      <p class="suggestions">Suggestions:</p>
-      <ul>
-        <li>Make sure that all words are spelled correctly.</li>
-        <li>Try different keywords.</li>
-        <li>Try more general keywords.</li>
-      </ul>
-      <img src="./images/no_results.gif" alt="Man fishing gif" />
+    <div class="page_navigation">
+        <button type="button" onclick="navigate_backward()">
+            &#8592; previous
+        </button>
+        <button type="button" onclick="navigate_forward()">next &#8594;</button>
     </div>
-    {{/if}}
-  </div>
-  <div class="page_navigation">
-    <button type="button" onclick="navigate_backward()">
-      &#8592; previous
-    </button>
-    <button type="button" onclick="navigate_forward()">next &#8594;</button>
-  </div>
 </main>
 <script src="static/index.js"></script>
 <script src="static/pagination.js"></script>

src/bin/websurfx.rs

@@ -3,9 +3,19 @@
 //! This module contains the main function which handles the logging of the application to the
 //! stdout and handles the command line arguments provided and launches the `websurfx` server.
 
+use mimalloc::MiMalloc;
 use std::net::TcpListener;
 use websurfx::{config::parser::Config, run};
 
+/// A dhat heap memory profiler
+#[cfg(feature = "dhat-heap")]
+#[global_allocator]
+static ALLOC: dhat::Alloc = dhat::Alloc;
+
+#[cfg(not(feature = "dhat-heap"))]
+#[global_allocator]
+static GLOBAL: MiMalloc = MiMalloc;
+
 /// The function that launches the main server and registers all the routes of the website.
 ///
 /// # Error
@@ -14,6 +24,10 @@ use websurfx::{config::parser::Config, run};
 /// available for being used for other applications.
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
+    // A dhat heap profiler initialization.
+    #[cfg(feature = "dhat-heap")]
+    let _profiler = dhat::Profiler::new_heap();
+
     // Initialize the parsed config file.
     let config = Config::parse(false).unwrap();
 

src/cache/cacher.rs

@@ -1,14 +1,24 @@
 //! This module provides the functionality to cache the aggregated results fetched and aggregated
 //! from the upstream search engines in a json format.
 
+use error_stack::Report;
+use futures::future::try_join_all;
 use md5::compute;
-use redis::{Client, Commands, Connection};
+use redis::{aio::ConnectionManager, AsyncCommands, Client, RedisError};
+
+use super::error::PoolError;
 
 /// A named struct which stores the redis Connection url address to which the client will
 /// connect to.
+#[derive(Clone)]
 pub struct RedisCache {
-    /// It stores the redis Connection url address.
-    connection: Connection,
+    /// It stores a pool of connections ready to be used.
+    connection_pool: Vec<ConnectionManager>,
+    /// It stores the size of the connection pool (in other words the number of
+    /// connections that should be stored in the pool).
+    pool_size: u8,
+    /// It stores the index of which connection is being used at the moment.
+    current_connection: u8,
 }
 
 impl RedisCache {
@@ -16,11 +26,25 @@ impl RedisCache {
     ///
     /// # Arguments
     ///
-    /// * `redis_connection_url` - It stores the redis Connection url address.
-    pub fn new(redis_connection_url: String) -> Result<Self, Box<dyn std::error::Error>> {
+    /// * `redis_connection_url` - It takes the redis Connection url address.
+    /// * `pool_size` - It takes the size of the connection pool (in other words the number of
+    /// connections that should be stored in the pool).
+    pub async fn new(
+        redis_connection_url: &str,
+        pool_size: u8,
+    ) -> Result<Self, Box<dyn std::error::Error>> {
         let client = Client::open(redis_connection_url)?;
-        let connection = client.get_connection()?;
-        let redis_cache = RedisCache { connection };
+        let mut tasks: Vec<_> = Vec::new();
+
+        for _ in 0..pool_size {
+            tasks.push(client.get_tokio_connection_manager());
+        }
+
+        let redis_cache = RedisCache {
+            connection_pool: try_join_all(tasks).await?,
+            pool_size,
+            current_connection: Default::default(),
+        };
         Ok(redis_cache)
     }
 
@@ -29,7 +53,7 @@ impl RedisCache {
     /// # Arguments
     ///
     /// * `url` - It takes an url as string.
-    fn hash_url(url: &str) -> String {
+    fn hash_url(&self, url: &str) -> String {
         format!("{:?}", compute(url))
     }
 
@@ -38,9 +62,42 @@ impl RedisCache {
     /// # Arguments
     ///
     /// * `url` - It takes an url as a string.
-    pub fn cached_json(&mut self, url: &str) -> Result<String, Box<dyn std::error::Error>> {
-        let hashed_url_string = Self::hash_url(url);
-        Ok(self.connection.get(hashed_url_string)?)
+    pub async fn cached_json(&mut self, url: &str) -> Result<String, Report<PoolError>> {
+        self.current_connection = Default::default();
+        let hashed_url_string: &str = &self.hash_url(url);
+
+        let mut result: Result<String, RedisError> = self.connection_pool
+            [self.current_connection as usize]
+            .get(hashed_url_string)
+            .await;
+
+        // Code to check whether the current connection being used is dropped with connection error
+        // or not. if it drops with the connection error then the current connection is replaced
+        // with a new connection from the pool which is then used to run the redis command then
+        // that connection is also checked whether it is dropped or not if it is not then the
+        // result is passed as a `Result` or else the same process repeats again and if all of the
+        // connections in the pool result in connection drop error then a custom pool error is
+        // returned.
+        loop {
+            match result {
+                Err(error) => match error.is_connection_dropped() {
+                    true => {
+                        self.current_connection += 1;
+                        if self.current_connection == self.pool_size {
+                            return Err(Report::new(
+                                PoolError::PoolExhaustionWithConnectionDropError,
+                            ));
+                        }
+                        result = self.connection_pool[self.current_connection as usize]
+                            .get(hashed_url_string)
+                            .await;
+                        continue;
+                    }
+                    false => return Err(Report::new(PoolError::RedisError(error))),
+                },
+                Ok(res) => return Ok(res),
+            }
+        }
     }
 
     /// A function which caches the results by using the hashed `url` as the key and
@@ -51,21 +108,45 @@ impl RedisCache {
     ///
     /// * `json_results` - It takes the json results string as an argument.
     /// * `url` - It takes the url as a String.
-    pub fn cache_results(
+    pub async fn cache_results(
         &mut self,
-        json_results: String,
+        json_results: &str,
         url: &str,
-    ) -> Result<(), Box<dyn std::error::Error>> {
-        let hashed_url_string = Self::hash_url(url);
-
-        // put results_json into cache
-        self.connection.set(&hashed_url_string, json_results)?;
+    ) -> Result<(), Report<PoolError>> {
+        self.current_connection = Default::default();
+        let hashed_url_string: &str = &self.hash_url(url);
 
-        // Set the TTL for the key to 60 seconds
-        self.connection
-            .expire::<String, u32>(hashed_url_string, 60)
-            .unwrap();
+        let mut result: Result<(), RedisError> = self.connection_pool
+            [self.current_connection as usize]
+            .set_ex(hashed_url_string, json_results, 60)
+            .await;
 
-        Ok(())
+        // Code to check whether the current connection being used is dropped with connection error
+        // or not. if it drops with the connection error then the current connection is replaced
+        // with a new connection from the pool which is then used to run the redis command then
+        // that connection is also checked whether it is dropped or not if it is not then the
+        // result is passed as a `Result` or else the same process repeats again and if all of the
+        // connections in the pool result in connection drop error then a custom pool error is
+        // returned.
+        loop {
+            match result {
+                Err(error) => match error.is_connection_dropped() {
+                    true => {
+                        self.current_connection += 1;
+                        if self.current_connection == self.pool_size {
+                            return Err(Report::new(
+                                PoolError::PoolExhaustionWithConnectionDropError,
+                            ));
+                        }
+                        result = self.connection_pool[self.current_connection as usize]
+                            .set_ex(hashed_url_string, json_results, 60)
+                            .await;
+                        continue;
+                    }
+                    false => return Err(Report::new(PoolError::RedisError(error))),
+                },
+                Ok(_) => return Ok(()),
+            }
+        }
     }
 }

src/cache/error.rs

@@ -0,0 +1,37 @@
+//! This module provides the error enum to handle different errors associated while requesting data from
+//! the redis server using an async connection pool.
+use std::fmt;
+
+use redis::RedisError;
+
+/// A custom error type used for handling redis async pool associated errors.
+#[derive(Debug)]
+pub enum PoolError {
+    /// This variant handles all errors related to `RedisError`,
+    RedisError(RedisError),
+    /// This variant handles the errors which occurs when all the connections
+    /// in the connection pool return a connection dropped redis error.
+    PoolExhaustionWithConnectionDropError,
+}
+
+impl fmt::Display for PoolError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            PoolError::RedisError(redis_error) => {
+                if let Some(detail) = redis_error.detail() {
+                    write!(f, "{}", detail)
+                } else {
+                    write!(f, "")
+                }
+            }
+            PoolError::PoolExhaustionWithConnectionDropError => {
+                write!(
+                    f,
+                    "Error all connections from the pool dropped with connection error"
+                )
+            }
+        }
+    }
+}
+
+impl error_stack::Context for PoolError {}

src/cache/mod.rs

@@ -2,3 +2,4 @@
 //! results fetched and aggregated from the upstream search engines in a json format.
 
 pub mod cacher;
+pub mod error;

src/config/parser.rs

@@ -3,9 +3,9 @@
 
 use crate::handler::paths::{file_path, FileType};
 
-use crate::models::parser_models::Style;
+use crate::models::parser_models::{AggregatorConfig, RateLimiter, Style};
 use log::LevelFilter;
-use rlua::Lua;
+use mlua::Lua;
 use std::{collections::HashMap, fs, thread::available_parallelism};
 
 /// A named struct which stores the parsed config file options.
@@ -32,14 +32,11 @@ pub struct Config {
     pub request_timeout: u8,
     /// It stores the number of threads which controls the app will use to run.
     pub threads: u8,
-}
-
-/// Configuration options for the aggregator.
-#[derive(Clone)]
-pub struct AggregatorConfig {
-    /// It stores the option to whether enable or disable random delays between
-    /// requests.
-    pub random_delay: bool,
+    /// It stores configuration options for the ratelimiting middleware.
+    pub rate_limiter: RateLimiter,
+    /// It stores the level of safe search to be used for restricting content in the
+    /// search results.
+    pub safe_search: u8,
 }
 
 impl Config {
@@ -57,53 +54,70 @@ impl Config {
     /// or io error if the config.lua file doesn't exists otherwise it returns a newly constructed
     /// Config struct with all the parsed config options from the parsed config file.
     pub fn parse(logging_initialized: bool) -> Result<Self, Box<dyn std::error::Error>> {
-        Lua::new().context(|context| -> Result<Self, Box<dyn std::error::Error>> {
-            let globals = context.globals();
+        let lua = Lua::new();
+        let globals = lua.globals();
 
-            context
-                .load(&fs::read_to_string(file_path(FileType::Config)?)?)
-                .exec()?;
+        lua.load(&fs::read_to_string(file_path(FileType::Config)?)?)
+            .exec()?;
 
-            let parsed_threads: u8 = globals.get::<_, u8>("threads")?;
+        let parsed_threads: u8 = globals.get::<_, u8>("threads")?;
 
-            let debug: bool = globals.get::<_, bool>("debug")?;
-            let logging:bool= globals.get::<_, bool>("logging")?;
+        let debug: bool = globals.get::<_, bool>("debug")?;
+        let logging: bool = globals.get::<_, bool>("logging")?;
 
-            if !logging_initialized {
-                set_logging_level(debug, logging);
-            }
+        if !logging_initialized {
+            set_logging_level(debug, logging);
+        }
+
+        let threads: u8 = if parsed_threads == 0 {
+            let total_num_of_threads: usize = available_parallelism()?.get() / 2;
+            log::error!(
+                "Config Error: The value of `threads` option should be a non zero positive integer"
+            );
+            log::error!("Falling back to using {} threads", total_num_of_threads);
+            total_num_of_threads as u8
+        } else {
+            parsed_threads
+        };
 
-            let threads: u8 = if parsed_threads == 0 {
-                let total_num_of_threads: usize =  available_parallelism()?.get() / 2;
-                log::error!("Config Error: The value of `threads` option should be a non zero positive integer");
-                log::error!("Falling back to using {} threads", total_num_of_threads);
-                total_num_of_threads as u8
-            } else {
-                parsed_threads
-            };
+        let rate_limiter = globals.get::<_, HashMap<String, u8>>("rate_limiter")?;
+
+        let parsed_safe_search: u8 = globals.get::<_, u8>("safe_search")?;
+        let safe_search: u8 = match parsed_safe_search {
+            0..=4 => parsed_safe_search,
+            _ => {
+                log::error!("Config Error: The value of `safe_search` option should be a non zero positive integer from 0 to 4.");
+                log::error!("Falling back to using the value `1` for the option");
+                1
+            }
+        };
 
-            Ok(Config {
-                port: globals.get::<_, u16>("port")?,
-                binding_ip: globals.get::<_, String>("binding_ip")?,
-                style: Style::new(
-                    globals.get::<_, String>("theme")?,
-                    globals.get::<_, String>("colorscheme")?,
-                ),
-                redis_url: globals.get::<_, String>("redis_url")?,
-                aggregator: AggregatorConfig {
-                    random_delay: globals.get::<_, bool>("production_use")?,
-                },
-                logging,
-                debug,
-                upstream_search_engines: globals
-                    .get::<_, HashMap<String, bool>>("upstream_search_engines")?
-                    .into_iter()
-                    .filter_map(|(key, value)| value.then_some(key))
-                    .filter_map(|engine| crate::models::engine_models::EngineHandler::new(&engine))
-                    .collect(),
-                request_timeout: globals.get::<_, u8>("request_timeout")?,
-                threads,
-            })
+        Ok(Config {
+            port: globals.get::<_, u16>("port")?,
+            binding_ip: globals.get::<_, String>("binding_ip")?,
+            style: Style::new(
+                globals.get::<_, String>("theme")?,
+                globals.get::<_, String>("colorscheme")?,
+            ),
+            redis_url: globals.get::<_, String>("redis_url")?,
+            aggregator: AggregatorConfig {
+                random_delay: globals.get::<_, bool>("production_use")?,
+            },
+            logging,
+            debug,
+            upstream_search_engines: globals
+                .get::<_, HashMap<String, bool>>("upstream_search_engines")?
+                .into_iter()
+                .filter_map(|(key, value)| value.then_some(key))
+                .filter_map(|engine| crate::models::engine_models::EngineHandler::new(&engine))
+                .collect(),
+            request_timeout: globals.get::<_, u8>("request_timeout")?,
+            threads,
+            rate_limiter: RateLimiter {
+                number_of_requests: rate_limiter["number_of_requests"],
+                time_limit: rate_limiter["time_limit"],
+            },
+            safe_search,
         })
     }
 }

src/engines/duckduckgo.rs

@@ -4,14 +4,14 @@
 
 use std::collections::HashMap;
 
-use reqwest::header::{HeaderMap, CONTENT_TYPE, COOKIE, REFERER, USER_AGENT};
+use reqwest::header::HeaderMap;
 use scraper::{Html, Selector};
 
 use crate::models::aggregation_models::SearchResult;
 
 use crate::models::engine_models::{EngineError, SearchEngine};
 
-use error_stack::{IntoReport, Report, Result, ResultExt};
+use error_stack::{Report, Result, ResultExt};
 
 /// A new DuckDuckGo engine type defined in-order to implement the `SearchEngine` trait which allows to
 /// reduce code duplication as well as allows to create vector of different search engines easily.
@@ -21,10 +21,11 @@ pub struct DuckDuckGo;
 impl SearchEngine for DuckDuckGo {
     async fn results(
         &self,
-        query: String,
+        query: &str,
         page: u32,
-        user_agent: String,
+        user_agent: &str,
         request_timeout: u8,
+        _safe_search: u8,
     ) -> Result<HashMap<String, SearchResult>, EngineError> {
         // Page number can be missing or empty string and so appropriate handling is required
         // so that upstream server recieves valid page number.
@@ -43,38 +44,19 @@ impl SearchEngine for DuckDuckGo {
         };
 
         // initializing HeaderMap and adding appropriate headers.
-        let mut header_map = HeaderMap::new();
-        header_map.insert(
-            USER_AGENT,
-            user_agent
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(
-            REFERER,
-            "https://google.com/"
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(
-            CONTENT_TYPE,
-            "application/x-www-form-urlencoded"
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(
-            COOKIE,
-            "kl=wt-wt"
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
+        let header_map = HeaderMap::try_from(&HashMap::from([
+            ("USER_AGENT".to_string(), user_agent.to_string()),
+            ("REFERER".to_string(), "https://google.com/".to_string()),
+            (
+                "CONTENT_TYPE".to_string(),
+                "application/x-www-form-urlencoded".to_string(),
+            ),
+            ("COOKIE".to_string(), "kl=wt-wt".to_string()),
+        ]))
+        .change_context(EngineError::UnexpectedError)?;
 
         let document: Html = Html::parse_document(
-            &DuckDuckGo::fetch_html_from_upstream(self, url, header_map, request_timeout).await?,
+            &DuckDuckGo::fetch_html_from_upstream(self, &url, header_map, request_timeout).await?,
         );
 
         let no_result: Selector = Selector::parse(".no-results")
@@ -108,8 +90,7 @@ impl SearchEngine for DuckDuckGo {
                         .next()
                         .unwrap()
                         .inner_html()
-                        .trim()
-                        .to_string(),
+                        .trim(),
                     format!(
                         "https://{}",
                         result
@@ -118,15 +99,15 @@ impl SearchEngine for DuckDuckGo {
                             .unwrap()
                             .inner_html()
                             .trim()
-                    ),
+                    )
+                    .as_str(),
                     result
                         .select(&result_desc)
                         .next()
                         .unwrap()
                         .inner_html()
-                        .trim()
-                        .to_string(),
-                    vec!["duckduckgo".to_string()],
+                        .trim(),
+                    &["duckduckgo"],
                 )
             })
             .map(|search_result| (search_result.url.clone(), search_result))

src/engines/searx.rs

@@ -2,14 +2,13 @@
 //! by querying the upstream searx search engine instance with user provided query and with a page
 //! number if provided.
 
-use reqwest::header::{HeaderMap, CONTENT_TYPE, COOKIE, REFERER, USER_AGENT};
+use reqwest::header::HeaderMap;
 use scraper::{Html, Selector};
 use std::collections::HashMap;
 
 use crate::models::aggregation_models::SearchResult;
-
 use crate::models::engine_models::{EngineError, SearchEngine};
-use error_stack::{IntoReport, Report, Result, ResultExt};
+use error_stack::{Report, Result, ResultExt};
 
 /// A new Searx engine type defined in-order to implement the `SearchEngine` trait which allows to
 /// reduce code duplication as well as allows to create vector of different search engines easily.
@@ -19,45 +18,38 @@ pub struct Searx;
 impl SearchEngine for Searx {
     async fn results(
         &self,
-        query: String,
+        query: &str,
         page: u32,
-        user_agent: String,
+        user_agent: &str,
         request_timeout: u8,
+        mut safe_search: u8,
     ) -> Result<HashMap<String, SearchResult>, EngineError> {
         // Page number can be missing or empty string and so appropriate handling is required
         // so that upstream server recieves valid page number.
+        if safe_search == 3 {
+            safe_search = 2;
+        };
+
         let url: String = match page {
-            0 | 1 => format!("https://searx.work/search?q={query}&pageno=1"),
-            _ => format!("https://searx.work/search?q={query}&pageno={page}"),
+            0 | 1 => {
+                format!("https://searx.work/search?q={query}&pageno=1&safesearch={safe_search}")
+            }
+            _ => format!(
+                "https://searx.work/search?q={query}&pageno={page}&safesearch={safe_search}"
+            ),
         };
 
         // initializing headers and adding appropriate headers.
-        let mut header_map = HeaderMap::new();
-        header_map.insert(
-            USER_AGENT,
-            user_agent
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(
-            REFERER,
-            "https://google.com/"
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(
-            CONTENT_TYPE,
-            "application/x-www-form-urlencoded"
-                .parse()
-                .into_report()
-                .change_context(EngineError::UnexpectedError)?,
-        );
-        header_map.insert(COOKIE, "categories=general; language=auto; locale=en; autocomplete=duckduckgo; image_proxy=1; method=POST; safesearch=2; theme=simple; results_on_new_tab=1; doi_resolver=oadoi.org; simple_style=auto; center_alignment=1; query_in_title=1; infinite_scroll=0; disabled_engines=; enabled_engines=\"archive is__general\\054yep__general\\054curlie__general\\054currency__general\\054ddg definitions__general\\054wikidata__general\\054duckduckgo__general\\054tineye__general\\054lingva__general\\054startpage__general\\054yahoo__general\\054wiby__general\\054marginalia__general\\054alexandria__general\\054wikibooks__general\\054wikiquote__general\\054wikisource__general\\054wikiversity__general\\054wikivoyage__general\\054dictzone__general\\054seznam__general\\054mojeek__general\\054naver__general\\054wikimini__general\\054brave__general\\054petalsearch__general\\054goo__general\"; disabled_plugins=; enabled_plugins=\"searx.plugins.hostname_replace\\054searx.plugins.oa_doi_rewrite\\054searx.plugins.vim_hotkeys\"; tokens=; maintab=on; enginetab=on".parse().into_report().change_context(EngineError::UnexpectedError)?);
+        let header_map = HeaderMap::try_from(&HashMap::from([
+            ("USER_AGENT".to_string(), user_agent.to_string()),
+            ("REFERER".to_string(), "https://google.com/".to_string()),
+            ("CONTENT_TYPE".to_string(), "application/x-www-form-urlencoded".to_string()),
+            ("COOKIE".to_string(), "categories=general; language=auto; locale=en; autocomplete=duckduckgo; image_proxy=1; method=POST; safesearch=2; theme=simple; results_on_new_tab=1; doi_resolver=oadoi.org; simple_style=auto; center_alignment=1; query_in_title=1; infinite_scroll=0; disabled_engines=; enabled_engines=\"archive is__general\\054yep__general\\054curlie__general\\054currency__general\\054ddg definitions__general\\054wikidata__general\\054duckduckgo__general\\054tineye__general\\054lingva__general\\054startpage__general\\054yahoo__general\\054wiby__general\\054marginalia__general\\054alexandria__general\\054wikibooks__general\\054wikiquote__general\\054wikisource__general\\054wikiversity__general\\054wikivoyage__general\\054dictzone__general\\054seznam__general\\054mojeek__general\\054naver__general\\054wikimini__general\\054brave__general\\054petalsearch__general\\054goo__general\"; disabled_plugins=; enabled_plugins=\"searx.plugins.hostname_replace\\054searx.plugins.oa_doi_rewrite\\054searx.plugins.vim_hotkeys\"; tokens=; maintab=on; enginetab=on".to_string())
+        ]))
+        .change_context(EngineError::UnexpectedError)?;
 
         let document: Html = Html::parse_document(
-            &Searx::fetch_html_from_upstream(self, url, header_map, request_timeout).await?,
+            &Searx::fetch_html_from_upstream(self, &url, header_map, request_timeout).await?,
         );
 
         let no_result: Selector = Selector::parse("#urls>.dialog-error>p")
@@ -98,24 +90,21 @@ impl SearchEngine for Searx {
                         .next()
                         .unwrap()
                         .inner_html()
-                        .trim()
-                        .to_string(),
+                        .trim(),
                     result
                         .select(&result_url)
                         .next()
                         .unwrap()
                         .value()
                         .attr("href")
-                        .unwrap()
-                        .to_string(),
+                        .unwrap(),
                     result
                         .select(&result_desc)
                         .next()
                         .unwrap()
                         .inner_html()
-                        .trim()
-                        .to_string(),
-                    vec!["searx".to_string()],
+                        .trim(),
+                    &["searx"],
                 )
             })
             .map(|search_result| (search_result.url.clone(), search_result))

src/handler/paths.rs

@@ -4,6 +4,7 @@
 use std::collections::HashMap;
 use std::io::Error;
 use std::path::Path;
+use std::sync::OnceLock;
 
 // ------- Constants --------
 /// The constant holding the name of the theme folder.
@@ -31,57 +32,7 @@ pub enum FileType {
 }
 
 /// A static variable which stores the different filesystem paths for various file/folder types.
-static FILE_PATHS_FOR_DIFF_FILE_TYPES: once_cell::sync::Lazy<HashMap<FileType, Vec<String>>> =
-    once_cell::sync::Lazy::new(|| {
-        HashMap::from([
-            (
-                FileType::Config,
-                vec![
-                    format!(
-                        "{}/.config/{}/{}",
-                        std::env::var("HOME").unwrap(),
-                        COMMON_DIRECTORY_NAME,
-                        CONFIG_FILE_NAME
-                    ),
-                    format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, CONFIG_FILE_NAME),
-                    format!("./{}/{}", COMMON_DIRECTORY_NAME, CONFIG_FILE_NAME),
-                ],
-            ),
-            (
-                FileType::Theme,
-                vec![
-                    format!("/opt/websurfx/{}/", PUBLIC_DIRECTORY_NAME),
-                    format!("./{}/", PUBLIC_DIRECTORY_NAME),
-                ],
-            ),
-            (
-                FileType::AllowList,
-                vec![
-                    format!(
-                        "{}/.config/{}/{}",
-                        std::env::var("HOME").unwrap(),
-                        COMMON_DIRECTORY_NAME,
-                        ALLOWLIST_FILE_NAME
-                    ),
-                    format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, ALLOWLIST_FILE_NAME),
-                    format!("./{}/{}", COMMON_DIRECTORY_NAME, ALLOWLIST_FILE_NAME),
-                ],
-            ),
-            (
-                FileType::BlockList,
-                vec![
-                    format!(
-                        "{}/.config/{}/{}",
-                        std::env::var("HOME").unwrap(),
-                        COMMON_DIRECTORY_NAME,
-                        BLOCKLIST_FILE_NAME
-                    ),
-                    format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, BLOCKLIST_FILE_NAME),
-                    format!("./{}/{}", COMMON_DIRECTORY_NAME, BLOCKLIST_FILE_NAME),
-                ],
-            ),
-        ])
-    });
+static FILE_PATHS_FOR_DIFF_FILE_TYPES: OnceLock<HashMap<FileType, Vec<String>>> = OnceLock::new();
 
 /// A function which returns an appropriate path for thr provided file type by checking if the path
 /// for the given file type exists on that path.
@@ -99,11 +50,64 @@ static FILE_PATHS_FOR_DIFF_FILE_TYPES: once_cell::sync::Lazy<HashMap<FileType, V
 /// 1. `/opt/websurfx` if it not present here then it fallbacks to the next one (2)
 /// 2. Under project folder ( or codebase in other words) if it is not present
 ///    here then it returns an error as mentioned above.
-pub fn file_path(file_type: FileType) -> Result<String, Error> {
-    let file_path = FILE_PATHS_FOR_DIFF_FILE_TYPES.get(&file_type).unwrap();
+pub fn file_path(file_type: FileType) -> Result<&'static str, Error> {
+    let file_path: &Vec<String> = FILE_PATHS_FOR_DIFF_FILE_TYPES
+        .get_or_init(|| {
+            HashMap::from([
+                (
+                    FileType::Config,
+                    vec![
+                        format!(
+                            "{}/.config/{}/{}",
+                            std::env::var("HOME").unwrap(),
+                            COMMON_DIRECTORY_NAME,
+                            CONFIG_FILE_NAME
+                        ),
+                        format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, CONFIG_FILE_NAME),
+                        format!("./{}/{}", COMMON_DIRECTORY_NAME, CONFIG_FILE_NAME),
+                    ],
+                ),
+                (
+                    FileType::Theme,
+                    vec![
+                        format!("/opt/websurfx/{}/", PUBLIC_DIRECTORY_NAME),
+                        format!("./{}/", PUBLIC_DIRECTORY_NAME),
+                    ],
+                ),
+                (
+                    FileType::AllowList,
+                    vec![
+                        format!(
+                            "{}/.config/{}/{}",
+                            std::env::var("HOME").unwrap(),
+                            COMMON_DIRECTORY_NAME,
+                            ALLOWLIST_FILE_NAME
+                        ),
+                        format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, ALLOWLIST_FILE_NAME),
+                        format!("./{}/{}", COMMON_DIRECTORY_NAME, ALLOWLIST_FILE_NAME),
+                    ],
+                ),
+                (
+                    FileType::BlockList,
+                    vec![
+                        format!(
+                            "{}/.config/{}/{}",
+                            std::env::var("HOME").unwrap(),
+                            COMMON_DIRECTORY_NAME,
+                            BLOCKLIST_FILE_NAME
+                        ),
+                        format!("/etc/xdg/{}/{}", COMMON_DIRECTORY_NAME, BLOCKLIST_FILE_NAME),
+                        format!("./{}/{}", COMMON_DIRECTORY_NAME, BLOCKLIST_FILE_NAME),
+                    ],
+                ),
+            ])
+        })
+        .get(&file_type)
+        .unwrap();
+
     for (idx, _) in file_path.iter().enumerate() {
         if Path::new(file_path[idx].as_str()).exists() {
-            return Ok(file_path[idx].clone());
+            return Ok(std::mem::take(&mut &*file_path[idx]));
         }
     }
 

src/lib.rs

@@ -19,6 +19,7 @@ use crate::server::router;
 
 use actix_cors::Cors;
 use actix_files as fs;
+use actix_governor::{Governor, GovernorConfigBuilder};
 use actix_web::{dev::Server, http::header, middleware::Logger, web, App, HttpServer};
 use config::parser::Config;
 use handlebars::Handlebars;
@@ -47,7 +48,7 @@ use handler::paths::{file_path, FileType};
 pub fn run(listener: TcpListener, config: Config) -> std::io::Result<Server> {
     let mut handlebars: Handlebars<'_> = Handlebars::new();
 
-    let public_folder_path: String = file_path(FileType::Theme)?;
+    let public_folder_path: &str = file_path(FileType::Theme)?;
 
     handlebars
         .register_templates_directory(".html", format!("{}/templates", public_folder_path))
@@ -69,10 +70,17 @@ pub fn run(listener: TcpListener, config: Config) -> std::io::Result<Server> {
             ]);
 
         App::new()
+            .wrap(Logger::default()) // added logging middleware for logging.
             .app_data(handlebars_ref.clone())
             .app_data(web::Data::new(config.clone()))
             .wrap(cors)
-            .wrap(Logger::default()) // added logging middleware for logging.
+            .wrap(Governor::new(
+                &GovernorConfigBuilder::default()
+                    .per_second(config.rate_limiter.time_limit as u64)
+                    .burst_size(config.rate_limiter.number_of_requests as u32)
+                    .finish()
+                    .unwrap(),
+            ))
             // Serve images and static files (css and js files).
             .service(
                 fs::Files::new("/static", format!("{}/static", public_folder_path))

src/models/aggregation_models.rs

@@ -2,6 +2,7 @@
 //! data scraped from the upstream search engines.
 
 use serde::{Deserialize, Serialize};
+use smallvec::SmallVec;
 
 use super::{engine_models::EngineError, parser_models::Style};
 
@@ -19,7 +20,7 @@ pub struct SearchResult {
     /// The description of the search result.
     pub description: String,
     /// The names of the upstream engines from which this results were provided.
-    pub engine: Vec<String>,
+    pub engine: SmallVec<[String; 0]>,
 }
 
 impl SearchResult {
@@ -32,12 +33,12 @@ impl SearchResult {
     /// (href url in html in simple words).
     /// * `description` - The description of the search result.
     /// * `engine` - The names of the upstream engines from which this results were provided.
-    pub fn new(title: String, url: String, description: String, engine: Vec<String>) -> Self {
+    pub fn new(title: &str, url: &str, description: &str, engine: &[&str]) -> Self {
         SearchResult {
-            title,
-            url,
-            description,
-            engine,
+            title: title.to_owned(),
+            url: url.to_owned(),
+            description: description.to_owned(),
+            engine: engine.iter().map(|name| name.to_string()).collect(),
         }
     }
 
@@ -46,8 +47,8 @@ impl SearchResult {
     /// # Arguments
     ///
     /// * `engine` - Takes an engine name provided as a String.
-    pub fn add_engines(&mut self, engine: String) {
-        self.engine.push(engine)
+    pub fn add_engines(&mut self, engine: &str) {
+        self.engine.push(engine.to_owned())
     }
 
     /// A function which returns the engine name stored from the struct as a string.
@@ -55,13 +56,13 @@ impl SearchResult {
     /// # Returns
     ///
     /// An engine name stored as a string from the struct.
-    pub fn engine(self) -> String {
-        self.engine.get(0).unwrap().to_string()
+    pub fn engine(&mut self) -> String {
+        std::mem::take(&mut self.engine[0])
     }
 }
 
 /// A named struct that stores the error info related to the upstream search engines.
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Clone)]
 pub struct EngineErrorInfo {
     /// It stores the error type which occured while fetching the result from a particular search
     /// engine.
@@ -81,18 +82,18 @@ impl EngineErrorInfo {
     /// * `error` - It takes the error type which occured while fetching the result from a particular
     /// search engine.
     /// * `engine` - It takes the name of the engine that failed to provide the requested search results.
-    pub fn new(error: &EngineError, engine: String) -> Self {
+    pub fn new(error: &EngineError, engine: &str) -> Self {
         Self {
             error: match error {
-                EngineError::RequestError => String::from("RequestError"),
-                EngineError::EmptyResultSet => String::from("EmptyResultSet"),
-                EngineError::UnexpectedError => String::from("UnexpectedError"),
+                EngineError::RequestError => "RequestError".to_owned(),
+                EngineError::EmptyResultSet => "EmptyResultSet".to_owned(),
+                EngineError::UnexpectedError => "UnexpectedError".to_owned(),
             },
-            engine,
+            engine: engine.to_owned(),
             severity_color: match error {
-                EngineError::RequestError => String::from("green"),
-                EngineError::EmptyResultSet => String::from("blue"),
-                EngineError::UnexpectedError => String::from("red"),
+                EngineError::RequestError => "green".to_owned(),
+                EngineError::EmptyResultSet => "blue".to_owned(),
+                EngineError::UnexpectedError => "red".to_owned(),
             },
         }
     }
@@ -101,7 +102,7 @@ impl EngineErrorInfo {
 /// A named struct to store, serialize, deserialize the all the search results scraped and
 /// aggregated from the upstream search engines.
 /// `SearchResult` structs.
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Default)]
 #[serde(rename_all = "camelCase")]
 pub struct SearchResults {
     /// Stores the individual serializable `SearchResult` struct into a vector of
@@ -113,6 +114,14 @@ pub struct SearchResults {
     /// Stores the information on which engines failed with their engine name
     /// and the type of error that caused it.
     pub engine_errors_info: Vec<EngineErrorInfo>,
+    /// Stores the flag option which holds the check value that the following
+    /// search query was disallowed when the safe search level set to 4 and it
+    /// was present in the `Blocklist` file.
+    pub disallowed: bool,
+    /// Stores the flag option which holds the check value that the following
+    /// search query was filtered when the safe search level set to 3 and it
+    /// was present in the `Blocklist` file.
+    pub filtered: bool,
 }
 
 impl SearchResults {
@@ -124,23 +133,49 @@ impl SearchResults {
     /// and stores it into a vector of `SearchResult` structs.
     /// * `page_query` - Takes an argument of current page`s search query `q` provided in
     /// the search url.
-    /// * `empty_result_set` - Takes a boolean which indicates that no engines gave a result for the
-    /// given search query.
+    /// * `engine_errors_info` - Takes an array of structs which contains information regarding
+    /// which engines failed with their names, reason and their severity color name.
     pub fn new(
         results: Vec<SearchResult>,
-        page_query: String,
-        engine_errors_info: Vec<EngineErrorInfo>,
+        page_query: &str,
+        engine_errors_info: &[EngineErrorInfo],
     ) -> Self {
-        SearchResults {
+        Self {
             results,
-            page_query,
-            style: Style::new("".to_string(), "".to_string()),
-            engine_errors_info,
+            page_query: page_query.to_owned(),
+            style: Style::default(),
+            engine_errors_info: engine_errors_info.to_owned(),
+            disallowed: Default::default(),
+            filtered: Default::default(),
         }
     }
 
     /// A setter function to add website style to the return search results.
-    pub fn add_style(&mut self, style: Style) {
-        self.style = style;
+    pub fn add_style(&mut self, style: &Style) {
+        self.style = style.clone();
+    }
+
+    /// A setter function that sets disallowed to true.
+    pub fn set_disallowed(&mut self) {
+        self.disallowed = true;
+    }
+
+    /// A setter function to set the current page search query.
+    pub fn set_page_query(&mut self, page: &str) {
+        self.page_query = page.to_owned();
+    }
+
+    /// A setter function that sets the filtered to true.
+    pub fn set_filtered(&mut self) {
+        self.filtered = true;
+    }
+
+    /// A getter function that gets the value of `engine_errors_info`.
+    pub fn engine_errors_info(&mut self) -> Vec<EngineErrorInfo> {
+        std::mem::take(&mut self.engine_errors_info)
+    }
+    /// A getter function that gets the value of `results`.
+    pub fn results(&mut self) -> Vec<SearchResult> {
+        self.results.clone()
     }
 }

src/models/engine_models.rs

@@ -2,7 +2,7 @@
 //! the upstream search engines with the search query provided by the user.
 
 use super::aggregation_models::SearchResult;
-use error_stack::{IntoReport, Result, ResultExt};
+use error_stack::{Result, ResultExt};
 use std::{collections::HashMap, fmt, time::Duration};
 
 /// A custom error type used for handle engine associated errors.
@@ -64,7 +64,7 @@ pub trait SearchEngine: Sync + Send {
     /// otherwise it returns a custom `EngineError`.
     async fn fetch_html_from_upstream(
         &self,
-        url: String,
+        url: &str,
         header_map: reqwest::header::HeaderMap,
         request_timeout: u8,
     ) -> Result<String, EngineError> {
@@ -75,11 +75,9 @@ pub trait SearchEngine: Sync + Send {
             .headers(header_map) // add spoofed headers to emulate human behavior
             .send()
             .await
-            .into_report()
             .change_context(EngineError::RequestError)?
             .text()
             .await
-            .into_report()
             .change_context(EngineError::RequestError)?)
     }
 
@@ -103,10 +101,11 @@ pub trait SearchEngine: Sync + Send {
     /// or HeaderMap fails to initialize.
     async fn results(
         &self,
-        query: String,
+        query: &str,
         page: u32,
-        user_agent: String,
+        user_agent: &str,
         request_timeout: u8,
+        safe_search: u8,
     ) -> Result<HashMap<String, SearchResult>, EngineError>;
 }
 

src/models/parser_models.rs

@@ -12,7 +12,7 @@ use serde::{Deserialize, Serialize};
 /// order to allow the deserializing the json back to struct in aggregate function in
 /// aggregator.rs and create a new struct out of it and then serialize it back to json and pass
 /// it to the template files.
-#[derive(Serialize, Deserialize, Clone)]
+#[derive(Serialize, Deserialize, Clone, Default)]
 pub struct Style {
     /// It stores the parsed theme option used to set a theme for the website.
     pub theme: String,
@@ -33,3 +33,20 @@ impl Style {
         Style { theme, colorscheme }
     }
 }
+
+/// Configuration options for the aggregator.
+#[derive(Clone)]
+pub struct AggregatorConfig {
+    /// It stores the option to whether enable or disable random delays between
+    /// requests.
+    pub random_delay: bool,
+}
+
+/// Configuration options for the rate limiter middleware.
+#[derive(Clone)]
+pub struct RateLimiter {
+    /// The number of request that are allowed within a provided time limit.
+    pub number_of_requests: u8,
+    /// The time limit in which the quantity of requests that should be accepted.
+    pub time_limit: u8,
+}

src/results/aggregator.rs

@@ -60,14 +60,15 @@ type FutureVec = Vec<JoinHandle<Result<HashMap<String, SearchResult>, Report<Eng
 /// function in either `searx` or `duckduckgo` or both otherwise returns a `SearchResults struct`
 /// containing appropriate values.
 pub async fn aggregate(
-    query: String,
+    query: &str,
     page: u32,
     random_delay: bool,
     debug: bool,
-    upstream_search_engines: Vec<EngineHandler>,
+    upstream_search_engines: &[EngineHandler],
     request_timeout: u8,
+    safe_search: u8,
 ) -> Result<SearchResults, Box<dyn std::error::Error>> {
-    let user_agent: String = random_user_agent();
+    let user_agent: &str = random_user_agent();
 
     // Add a random delay before making the request.
     if random_delay || !debug {
@@ -76,19 +77,24 @@ pub async fn aggregate(
         tokio::time::sleep(Duration::from_secs(delay_secs)).await;
     }
 
-    let mut names: Vec<&str> = vec![];
+    let mut names: Vec<&str> = Vec::with_capacity(0);
 
     // create tasks for upstream result fetching
     let mut tasks: FutureVec = FutureVec::new();
 
     for engine_handler in upstream_search_engines {
-        let (name, search_engine) = engine_handler.into_name_engine();
+        let (name, search_engine) = engine_handler.to_owned().into_name_engine();
         names.push(name);
-        let query: String = query.clone();
-        let user_agent: String = user_agent.clone();
+        let query: String = query.to_owned();
         tasks.push(tokio::spawn(async move {
             search_engine
-                .results(query, page, user_agent.clone(), request_timeout)
+                .results(
+                    &query,
+                    page,
+                    user_agent.clone(),
+                    request_timeout,
+                    safe_search,
+                )
                 .await
         }));
     }
@@ -106,7 +112,7 @@ pub async fn aggregate(
     let mut result_map: HashMap<String, SearchResult> = HashMap::new();
     let mut engine_errors_info: Vec<EngineErrorInfo> = Vec::new();
 
-    let mut handle_error = |error: Report<EngineError>, engine_name: String| {
+    let mut handle_error = |error: &Report<EngineError>, engine_name: &'static str| {
         log::error!("Engine Error: {:?}", error);
         engine_errors_info.push(EngineErrorInfo::new(
             error.downcast_ref::<EngineError>().unwrap(),
@@ -116,7 +122,7 @@ pub async fn aggregate(
 
     for _ in 0..responses.len() {
         let response = responses.pop().unwrap();
-        let engine = names.pop().unwrap().to_string();
+        let engine = names.pop().unwrap();
 
         if result_map.is_empty() {
             match response {
@@ -124,7 +130,7 @@ pub async fn aggregate(
                     result_map = results.clone();
                 }
                 Err(error) => {
-                    handle_error(error, engine);
+                    handle_error(&error, engine);
                 }
             }
             continue;
@@ -136,39 +142,37 @@ pub async fn aggregate(
                     result_map
                         .entry(key)
                         .and_modify(|result| {
-                            result.add_engines(engine.clone());
+                            result.add_engines(engine);
                         })
                         .or_insert_with(|| -> SearchResult { value });
                 });
             }
             Err(error) => {
-                handle_error(error, engine);
+                handle_error(&error, engine);
             }
         }
     }
 
-    let mut blacklist_map: HashMap<String, SearchResult> = HashMap::new();
-    filter_with_lists(
-        &mut result_map,
-        &mut blacklist_map,
-        &file_path(FileType::BlockList)?,
-    )?;
+    if safe_search >= 3 {
+        let mut blacklist_map: HashMap<String, SearchResult> = HashMap::new();
+        filter_with_lists(
+            &mut result_map,
+            &mut blacklist_map,
+            file_path(FileType::BlockList)?,
+        )?;
 
-    filter_with_lists(
-        &mut blacklist_map,
-        &mut result_map,
-        &file_path(FileType::AllowList)?,
-    )?;
+        filter_with_lists(
+            &mut blacklist_map,
+            &mut result_map,
+            file_path(FileType::AllowList)?,
+        )?;
 
-    drop(blacklist_map);
+        drop(blacklist_map);
+    }
 
     let results: Vec<SearchResult> = result_map.into_values().collect();
 
-    Ok(SearchResults::new(
-        results,
-        query.to_string(),
-        engine_errors_info,
-    ))
+    Ok(SearchResults::new(results, query, &engine_errors_info))
 }
 
 /// Filters a map of search results using a list of regex patterns.
@@ -190,7 +194,7 @@ pub fn filter_with_lists(
     let mut reader = BufReader::new(File::open(file_path)?);
 
     for line in reader.by_ref().lines() {
-        let re = Regex::new(&line?)?;
+        let re = Regex::new(line?.trim())?;
 
         // Iterate over each search result in the map and check if it matches the regex pattern
         for (url, search_result) in map_to_be_filtered.clone().into_iter() {
@@ -199,7 +203,10 @@ pub fn filter_with_lists(
                 || re.is_match(&search_result.description.to_lowercase())
             {
                 // If the search result matches the regex pattern, move it from the original map to the resultant map
-                resultant_map.insert(url.clone(), map_to_be_filtered.remove(&url).unwrap());
+                resultant_map.insert(
+                    url.to_owned(),
+                    map_to_be_filtered.remove(&url.to_owned()).unwrap(),
+                );
             }
         }
     }
@@ -210,6 +217,7 @@ pub fn filter_with_lists(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use smallvec::smallvec;
     use std::collections::HashMap;
     use std::io::Write;
     use tempfile::NamedTempFile;
@@ -219,22 +227,22 @@ mod tests {
         // Create a map of search results to filter
         let mut map_to_be_filtered = HashMap::new();
         map_to_be_filtered.insert(
-            "https://www.example.com".to_string(),
+            "https://www.example.com".to_owned(),
             SearchResult {
-                title: "Example Domain".to_string(),
-                url: "https://www.example.com".to_string(),
+                title: "Example Domain".to_owned(),
+                url: "https://www.example.com".to_owned(),
                 description: "This domain is for use in illustrative examples in documents."
-                    .to_string(),
-                engine: vec!["Google".to_string(), "Bing".to_string()],
+                    .to_owned(),
+                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
             },
         );
         map_to_be_filtered.insert(
-            "https://www.rust-lang.org/".to_string(),
+            "https://www.rust-lang.org/".to_owned(),
             SearchResult {
-                title: "Rust Programming Language".to_string(),
-                url: "https://www.rust-lang.org/".to_string(),
-                description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_string(),
-                engine: vec!["Google".to_string(), "DuckDuckGo".to_string()],
+                title: "Rust Programming Language".to_owned(),
+                url: "https://www.rust-lang.org/".to_owned(),
+                description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_owned(),
+                engine: smallvec!["Google".to_owned(), "DuckDuckGo".to_owned()],
             },
         );
 
@@ -263,22 +271,22 @@ mod tests {
     fn test_filter_with_lists_wildcard() -> Result<(), Box<dyn std::error::Error>> {
         let mut map_to_be_filtered = HashMap::new();
         map_to_be_filtered.insert(
-            "https://www.example.com".to_string(),
+            "https://www.example.com".to_owned(),
             SearchResult {
-                title: "Example Domain".to_string(),
-                url: "https://www.example.com".to_string(),
+                title: "Example Domain".to_owned(),
+                url: "https://www.example.com".to_owned(),
                 description: "This domain is for use in illustrative examples in documents."
-                    .to_string(),
-                engine: vec!["Google".to_string(), "Bing".to_string()],
+                    .to_owned(),
+                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
             },
         );
         map_to_be_filtered.insert(
-            "https://www.rust-lang.org/".to_string(),
+            "https://www.rust-lang.org/".to_owned(),
             SearchResult {
-                title: "Rust Programming Language".to_string(),
-                url: "https://www.rust-lang.org/".to_string(),
-                description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_string(),
-                engine: vec!["Google".to_string(), "DuckDuckGo".to_string()],
+                title: "Rust Programming Language".to_owned(),
+                url: "https://www.rust-lang.org/".to_owned(),
+                description: "A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.".to_owned(),
+                engine: smallvec!["Google".to_owned(), "DuckDuckGo".to_owned()],
             },
         );
 
@@ -323,13 +331,13 @@ mod tests {
     fn test_filter_with_lists_invalid_regex() {
         let mut map_to_be_filtered = HashMap::new();
         map_to_be_filtered.insert(
-            "https://www.example.com".to_string(),
+            "https://www.example.com".to_owned(),
             SearchResult {
-                title: "Example Domain".to_string(),
-                url: "https://www.example.com".to_string(),
+                title: "Example Domain".to_owned(),
+                url: "https://www.example.com".to_owned(),
                 description: "This domain is for use in illustrative examples in documents."
-                    .to_string(),
-                engine: vec!["Google".to_string(), "Bing".to_string()],
+                    .to_owned(),
+                engine: smallvec!["Google".to_owned(), "Bing".to_owned()],
             },
         );
 

src/results/user_agent.rs

@@ -1,30 +1,34 @@
 //! This module provides the functionality to generate random user agent string.
 
+use std::sync::OnceLock;
+
 use fake_useragent::{Browsers, UserAgents, UserAgentsBuilder};
 
 /// A static variable which stores the initially build `UserAgents` struct. So as it can be resused
 /// again and again without the need of reinitializing the `UserAgents` struct.
-static USER_AGENTS: once_cell::sync::Lazy<UserAgents> = once_cell::sync::Lazy::new(|| {
-    UserAgentsBuilder::new()
-        .cache(false)
-        .dir("/tmp")
-        .thread(1)
-        .set_browsers(
-            Browsers::new()
-                .set_chrome()
-                .set_safari()
-                .set_edge()
-                .set_firefox()
-                .set_mozilla(),
-        )
-        .build()
-});
+static USER_AGENTS: OnceLock<UserAgents> = OnceLock::new();
 
 /// A function to generate random user agent to improve privacy of the user.
 ///
 /// # Returns
 ///
 /// A randomly generated user agent string.
-pub fn random_user_agent() -> String {
-    USER_AGENTS.random().to_string()
+pub fn random_user_agent() -> &'static str {
+    USER_AGENTS
+        .get_or_init(|| {
+            UserAgentsBuilder::new()
+                .cache(false)
+                .dir("/tmp")
+                .thread(1)
+                .set_browsers(
+                    Browsers::new()
+                        .set_chrome()
+                        .set_safari()
+                        .set_edge()
+                        .set_firefox()
+                        .set_mozilla(),
+                )
+                .build()
+        })
+        .random()
 }

src/server/routes/search.rs

@@ -3,17 +3,73 @@
 use crate::{
     cache::cacher::RedisCache,
     config::parser::Config,
-    models::{
-        aggregation_models::SearchResults,
-        engine_models::EngineHandler,
-        server_models::{Cookie, SearchParams},
-    },
+    handler::paths::{file_path, FileType},
+    models::{aggregation_models::SearchResults, engine_models::EngineHandler},
     results::aggregator::aggregate,
 };
 use actix_web::{get, web, HttpRequest, HttpResponse};
 use handlebars::Handlebars;
+use regex::Regex;
+use serde::Deserialize;
+use std::{
+    fs::{read_to_string, File},
+    io::{BufRead, BufReader, Read},
+};
 use tokio::join;
 
+// ---- Constants ----
+/// Initialize redis cache connection once and store it on the heap.
+static REDIS_CACHE: async_once_cell::OnceCell<RedisCache> = async_once_cell::OnceCell::new();
+
+/// A named struct which deserializes all the user provided search parameters and stores them.
+#[derive(Deserialize)]
+pub struct SearchParams {
+    /// It stores the search parameter option `q` (or query in simple words)
+    /// of the search url.
+    q: Option<String>,
+    /// It stores the search parameter `page` (or pageno in simple words)
+    /// of the search url.
+    page: Option<u32>,
+    /// It stores the search parameter `safesearch` (or safe search level in simple words) of the
+    /// search url.
+    safesearch: Option<u8>,
+}
+
+/// Handles the route of index page or main page of the `websurfx` meta search engine website.
+#[get("/")]
+pub async fn index(
+    hbs: web::Data<Handlebars<'_>>,
+    config: web::Data<Config>,
+) -> Result<HttpResponse, Box<dyn std::error::Error>> {
+    let page_content: String = hbs.render("index", &config.style).unwrap();
+    Ok(HttpResponse::Ok().body(page_content))
+}
+
+/// Handles the route of any other accessed route/page which is not provided by the
+/// website essentially the 404 error page.
+pub async fn not_found(
+    hbs: web::Data<Handlebars<'_>>,
+    config: web::Data<Config>,
+) -> Result<HttpResponse, Box<dyn std::error::Error>> {
+    let page_content: String = hbs.render("404", &config.style)?;
+
+    Ok(HttpResponse::Ok()
+        .content_type("text/html; charset=utf-8")
+        .body(page_content))
+}
+
+/// A named struct which is used to deserialize the cookies fetched from the client side.
+#[allow(dead_code)]
+#[derive(Deserialize)]
+struct Cookie<'a> {
+    /// It stores the theme name used in the website.
+    theme: &'a str,
+    /// It stores the colorscheme name used for the website theme.
+    colorscheme: &'a str,
+    /// It stores the user selected upstream search engines selected from the UI.
+    engines: Vec<&'a str>,
+}
+
 /// Handles the route of search page of the `websurfx` meta search engine website and it takes
 /// two search url parameters `q` and `page` where `page` parameter is optional.
 ///
@@ -47,42 +103,58 @@ pub async fn search(
                 None => 1,
             };
 
+            let safe_search: u8 = match config.safe_search {
+                3..=4 => config.safe_search,
+                _ => match &params.safesearch {
+                    Some(safesearch) => match safesearch {
+                        0..=2 => *safesearch,
+                        _ => 1,
+                    },
+                    None => config.safe_search,
+                },
+            };
+
             let (_, results, _) = join!(
                 results(
                     format!(
-                        "http://{}:{}/search?q={}&page={}",
+                        "http://{}:{}/search?q={}&page={}&safesearch={}",
                         config.binding_ip,
                         config.port,
                         query,
-                        page - 1
+                        page - 1,
+                        safe_search
                     ),
                     &config,
-                    query.to_string(),
+                    query,
                     page - 1,
                     req.clone(),
+                    safe_search
                 ),
                 results(
                     format!(
-                        "http://{}:{}/search?q={}&page={}",
-                        config.binding_ip, config.port, query, page
+                        "http://{}:{}/search?q={}&page={}&safesearch={}",
+                        config.binding_ip, config.port, query, page, safe_search
                     ),
                     &config,
-                    query.to_string(),
+                    query,
                     page,
                     req.clone(),
+                    safe_search
                 ),
                 results(
                     format!(
-                        "http://{}:{}/search?q={}&page={}",
+                        "http://{}:{}/search?q={}&page={}&safesearch={}",
                         config.binding_ip,
                         config.port,
                         query,
-                        page + 1
+                        page + 1,
+                        safe_search
                     ),
                     &config,
-                    query.to_string(),
+                    query,
                     page + 1,
                     req.clone(),
+                    safe_search
                 )
             );
 
@@ -113,28 +185,54 @@ pub async fn search(
 async fn results(
     url: String,
     config: &Config,
-    query: String,
+    query: &str,
     page: u32,
     req: HttpRequest,
+    safe_search: u8,
 ) -> Result<SearchResults, Box<dyn std::error::Error>> {
     // Initialize redis cache connection struct
-    let mut redis_cache = RedisCache::new(config.redis_url.clone())?;
+    let mut redis_cache: RedisCache = REDIS_CACHE
+        .get_or_init(async {
+            // Initialize redis cache connection pool only one and store it in the heap.
+            RedisCache::new(&config.redis_url, 5).await.unwrap()
+        })
+        .await
+        .clone();
     // fetch the cached results json.
-    let cached_results_json = redis_cache.cached_json(&url);
+    let cached_results_json: Result<String, error_stack::Report<crate::cache::error::PoolError>> =
+        redis_cache.clone().cached_json(&url).await;
     // check if fetched cache results was indeed fetched or it was an error and if so
     // handle the data accordingly.
     match cached_results_json {
-        Ok(results) => Ok(serde_json::from_str::<SearchResults>(&results).unwrap()),
+        Ok(results) => Ok(serde_json::from_str::<SearchResults>(&results)?),
         Err(_) => {
+            if safe_search == 4 {
+                let mut results: SearchResults = SearchResults::default();
+                let mut _flag: bool =
+                    is_match_from_filter_list(file_path(FileType::BlockList)?, query)?;
+                _flag = !is_match_from_filter_list(file_path(FileType::AllowList)?, query)?;
+
+                if _flag {
+                    results.set_disallowed();
+                    results.add_style(&config.style);
+                    results.set_page_query(query);
+                    redis_cache
+                        .cache_results(&serde_json::to_string(&results)?, &url)
+                        .await?;
+                    return Ok(results);
+                }
+            }
+
             // check if the cookie value is empty or not if it is empty then use the
             // default selected upstream search engines from the config file otherwise
             // parse the non-empty cookie and grab the user selected engines from the
             // UI and use that.
             let mut results: SearchResults = match req.cookie("appCookie") {
                 Some(cookie_value) => {
-                    let cookie_value: Cookie = serde_json::from_str(cookie_value.name_value().1)?;
+                    let cookie_value: Cookie<'_> =
+                        serde_json::from_str(cookie_value.name_value().1)?;
 
-                    let engines = cookie_value
+                    let engines: Vec<EngineHandler> = cookie_value
                         .engines
                         .iter()
                         .filter_map(|name| EngineHandler::new(name))
@@ -145,8 +243,9 @@ async fn results(
                         page,
                         config.aggregator.random_delay,
                         config.debug,
-                        engines,
+                        &engines,
                         config.request_timeout,
+                        safe_search,
                     )
                     .await?
                 }
@@ -156,15 +255,69 @@ async fn results(
                         page,
                         config.aggregator.random_delay,
                         config.debug,
-                        config.upstream_search_engines.clone(),
+                        &config.upstream_search_engines,
                         config.request_timeout,
+                        safe_search,
                     )
                     .await?
                 }
             };
-            results.add_style(config.style.clone());
-            redis_cache.cache_results(serde_json::to_string(&results)?, &url)?;
+            if results.engine_errors_info().is_empty() && results.results().is_empty() {
+                results.set_filtered();
+            }
+            results.add_style(&config.style);
+            redis_cache
+                .cache_results(&serde_json::to_string(&results)?, &url)
+                .await?;
             Ok(results)
         }
     }
 }
+
+/// A helper function which checks whether the search query contains any keywords which should be
+/// disallowed/allowed based on the regex based rules present in the blocklist and allowlist files.
+fn is_match_from_filter_list(
+    file_path: &str,
+    query: &str,
+) -> Result<bool, Box<dyn std::error::Error>> {
+    let mut flag = false;
+    let mut reader = BufReader::new(File::open(file_path)?);
+    for line in reader.by_ref().lines() {
+        let re = Regex::new(&line?)?;
+        if re.is_match(query) {
+            flag = true;
+            break;
+        }
+    }
+    Ok(flag)
+}
+
+/// Handles the route of robots.txt page of the `websurfx` meta search engine website.
+#[get("/robots.txt")]
+pub async fn robots_data(_req: HttpRequest) -> Result<HttpResponse, Box<dyn std::error::Error>> {
+    let page_content: String =
+        read_to_string(format!("{}/robots.txt", file_path(FileType::Theme)?))?;
+    Ok(HttpResponse::Ok()
+        .content_type("text/plain; charset=ascii")
+        .body(page_content))
+}
+
+/// Handles the route of about page of the `websurfx` meta search engine website.
+#[get("/about")]
+pub async fn about(
+    hbs: web::Data<Handlebars<'_>>,
+    config: web::Data<Config>,
+) -> Result<HttpResponse, Box<dyn std::error::Error>> {
+    let page_content: String = hbs.render("about", &config.style)?;
+    Ok(HttpResponse::Ok().body(page_content))
+}
+
+/// Handles the route of settings page of the `websurfx` meta search engine website.
+#[get("/settings")]
+pub async fn settings(
+    hbs: web::Data<Handlebars<'_>>,
+    config: web::Data<Config>,
+) -> Result<HttpResponse, Box<dyn std::error::Error>> {
+    let page_content: String = hbs.render("settings", &config.style)?;
+    Ok(HttpResponse::Ok().body(page_content))
+}

websurfx/config.lua

@@ -10,6 +10,21 @@ production_use = false -- whether to use production mode or not (in other words
 -- if production_use is set to true
 -- There will be a random delay before sending the request to the search engines, this is to prevent DDoSing the upstream search engines from a large number of simultaneous requests.
 request_timeout = 30 -- timeout for the search requests sent to the upstream search engines to be fetched (value in seconds).
+rate_limiter = {
+	number_of_requests = 20, -- The number of request that are allowed within a provided time limit.
+	time_limit = 3, -- The time limit in which the quantity of requests that should be accepted.
+}
+
+-- ### Search ###
+-- Filter results based on different levels. The levels provided are:
+-- {{
+-- 0 - None
+-- 1 - Low
+-- 2 - Moderate
+-- 3 - High
+-- 4 - Aggressive
+-- }}
+safe_search = 2
 
 -- ### Website ###
 -- The different colorschemes provided are:
@@ -34,4 +49,7 @@ theme = "simple" -- the theme name which should be used for the website
 redis_url = "redis://127.0.0.1:8082" -- redis connection url address on which the client should connect on.
 
 -- ### Search Engines ###
-upstream_search_engines = { DuckDuckGo = true, Searx = false } -- select the upstream search engines from which the results should be fetched.
+upstream_search_engines = {
+	DuckDuckGo = true,
+	Searx = false,
+} -- select the upstream search engines from which the results should be fetched.