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from typing import List, Optional, Sequence, Tuple, Union, cast
from uuid import UUID
from overrides import overrides
from chromadb.config import DEFAULT_DATABASE, DEFAULT_TENANT, System
from chromadb.db.base import NotFoundError, UniqueConstraintError
from chromadb.db.system import SysDB
from chromadb.proto.convert import (
from_proto_collection,
from_proto_segment,
to_proto_update_metadata,
to_proto_segment,
to_proto_segment_scope,
)
from chromadb.proto.coordinator_pb2 import (
CreateCollectionRequest,
CreateDatabaseRequest,
CreateSegmentRequest,
CreateTenantRequest,
DeleteCollectionRequest,
DeleteSegmentRequest,
GetCollectionsRequest,
GetCollectionsResponse,
GetDatabaseRequest,
GetSegmentsRequest,
GetTenantRequest,
UpdateCollectionRequest,
UpdateSegmentRequest,
)
from chromadb.proto.coordinator_pb2_grpc import SysDBStub
from chromadb.types import (
Collection,
Database,
Metadata,
OptionalArgument,
Segment,
SegmentScope,
Tenant,
Unspecified,
UpdateMetadata,
)
from google.protobuf.empty_pb2 import Empty
import grpc
class GrpcSysDB(SysDB):
"""A gRPC implementation of the SysDB. In the distributed system, the SysDB is also
called the 'Coordinator'. This implementation is used by Chroma frontend servers
to call a remote SysDB (Coordinator) service."""
_sys_db_stub: SysDBStub
_channel: grpc.Channel
_coordinator_url: str
_coordinator_port: int
def __init__(self, system: System):
self._coordinator_url = system.settings.require("chroma_coordinator_host")
# TODO: break out coordinator_port into a separate setting?
self._coordinator_port = system.settings.require("chroma_server_grpc_port")
return super().__init__(system)
@overrides
def start(self) -> None:
# TODO: add retry policy here
self._channel = grpc.insecure_channel(
f"{self._coordinator_url}:{self._coordinator_port}"
)
self._sys_db_stub = SysDBStub(self._channel) # type: ignore
return super().start()
@overrides
def stop(self) -> None:
self._channel.close()
return super().stop()
@overrides
def reset_state(self) -> None:
self._sys_db_stub.ResetState(Empty())
return super().reset_state()
@overrides
def create_database(
self, id: UUID, name: str, tenant: str = DEFAULT_TENANT
) -> None:
request = CreateDatabaseRequest(id=id.hex, name=name, tenant=tenant)
response = self._sys_db_stub.CreateDatabase(request)
if response.status.code == 409:
raise UniqueConstraintError()
@overrides
def get_database(self, name: str, tenant: str = DEFAULT_TENANT) -> Database:
request = GetDatabaseRequest(name=name, tenant=tenant)
response = self._sys_db_stub.GetDatabase(request)
if response.status.code == 404:
raise NotFoundError()
return Database(
id=UUID(hex=response.database.id),
name=response.database.name,
tenant=response.database.tenant,
)
@overrides
def create_tenant(self, name: str) -> None:
request = CreateTenantRequest(name=name)
response = self._sys_db_stub.CreateTenant(request)
if response.status.code == 409:
raise UniqueConstraintError()
@overrides
def get_tenant(self, name: str) -> Tenant:
request = GetTenantRequest(name=name)
response = self._sys_db_stub.GetTenant(request)
if response.status.code == 404:
raise NotFoundError()
return Tenant(
name=response.tenant.name,
)
@overrides
def create_segment(self, segment: Segment) -> None:
proto_segment = to_proto_segment(segment)
request = CreateSegmentRequest(
segment=proto_segment,
)
response = self._sys_db_stub.CreateSegment(request)
if response.status.code == 409:
raise UniqueConstraintError()
@overrides
def delete_segment(self, id: UUID) -> None:
request = DeleteSegmentRequest(
id=id.hex,
)
response = self._sys_db_stub.DeleteSegment(request)
if response.status.code == 404:
raise NotFoundError()
@overrides
def get_segments(
self,
id: Optional[UUID] = None,
type: Optional[str] = None,
scope: Optional[SegmentScope] = None,
topic: Optional[str] = None,
collection: Optional[UUID] = None,
) -> Sequence[Segment]:
request = GetSegmentsRequest(
id=id.hex if id else None,
type=type,
scope=to_proto_segment_scope(scope) if scope else None,
topic=topic,
collection=collection.hex if collection else None,
)
response = self._sys_db_stub.GetSegments(request)
results: List[Segment] = []
for proto_segment in response.segments:
segment = from_proto_segment(proto_segment)
results.append(segment)
return results
@overrides
def update_segment(
self,
id: UUID,
topic: OptionalArgument[Optional[str]] = Unspecified(),
collection: OptionalArgument[Optional[UUID]] = Unspecified(),
metadata: OptionalArgument[Optional[UpdateMetadata]] = Unspecified(),
) -> None:
write_topic = None
if topic != Unspecified():
write_topic = cast(Union[str, None], topic)
write_collection = None
if collection != Unspecified():
write_collection = cast(Union[UUID, None], collection)
write_metadata = None
if metadata != Unspecified():
write_metadata = cast(Union[UpdateMetadata, None], metadata)
request = UpdateSegmentRequest(
id=id.hex,
topic=write_topic,
collection=write_collection.hex if write_collection else None,
metadata=to_proto_update_metadata(write_metadata)
if write_metadata
else None,
)
if topic is None:
request.ClearField("topic")
request.reset_topic = True
if collection is None:
request.ClearField("collection")
request.reset_collection = True
if metadata is None:
request.ClearField("metadata")
request.reset_metadata = True
self._sys_db_stub.UpdateSegment(request)
@overrides
def create_collection(
self,
id: UUID,
name: str,
metadata: Optional[Metadata] = None,
dimension: Optional[int] = None,
get_or_create: bool = False,
tenant: str = DEFAULT_TENANT,
database: str = DEFAULT_DATABASE,
) -> Tuple[Collection, bool]:
request = CreateCollectionRequest(
id=id.hex,
name=name,
metadata=to_proto_update_metadata(metadata) if metadata else None,
dimension=dimension,
get_or_create=get_or_create,
tenant=tenant,
database=database,
)
response = self._sys_db_stub.CreateCollection(request)
if response.status.code == 409:
raise UniqueConstraintError()
collection = from_proto_collection(response.collection)
return collection, response.created
@overrides
def delete_collection(
self, id: UUID, tenant: str = DEFAULT_TENANT, database: str = DEFAULT_DATABASE
) -> None:
request = DeleteCollectionRequest(
id=id.hex,
tenant=tenant,
database=database,
)
response = self._sys_db_stub.DeleteCollection(request)
if response.status.code == 404:
raise NotFoundError()
@overrides
def get_collections(
self,
id: Optional[UUID] = None,
topic: Optional[str] = None,
name: Optional[str] = None,
tenant: str = DEFAULT_TENANT,
database: str = DEFAULT_DATABASE,
limit: Optional[int] = None,
offset: Optional[int] = None,
) -> Sequence[Collection]:
# TODO: implement limit and offset in the gRPC service
request = GetCollectionsRequest(
id=id.hex if id else None,
topic=topic,
name=name,
tenant=tenant,
database=database,
)
response: GetCollectionsResponse = self._sys_db_stub.GetCollections(request)
results: List[Collection] = []
for collection in response.collections:
results.append(from_proto_collection(collection))
return results
@overrides
def update_collection(
self,
id: UUID,
topic: OptionalArgument[str] = Unspecified(),
name: OptionalArgument[str] = Unspecified(),
dimension: OptionalArgument[Optional[int]] = Unspecified(),
metadata: OptionalArgument[Optional[UpdateMetadata]] = Unspecified(),
) -> None:
write_topic = None
if topic != Unspecified():
write_topic = cast(str, topic)
write_name = None
if name != Unspecified():
write_name = cast(str, name)
write_dimension = None
if dimension != Unspecified():
write_dimension = cast(Union[int, None], dimension)
write_metadata = None
if metadata != Unspecified():
write_metadata = cast(Union[UpdateMetadata, None], metadata)
request = UpdateCollectionRequest(
id=id.hex,
topic=write_topic,
name=write_name,
dimension=write_dimension,
metadata=to_proto_update_metadata(write_metadata)
if write_metadata
else None,
)
if metadata is None:
request.ClearField("metadata")
request.reset_metadata = True
response = self._sys_db_stub.UpdateCollection(request)
if response.status.code == 404:
raise NotFoundError()
def reset_and_wait_for_ready(self) -> None:
self._sys_db_stub.ResetState(Empty(), wait_for_ready=True)
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