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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package clients
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"github.com/weaviate/weaviate/usecases/cluster"
)
type ClusterSchema struct {
client *http.Client
}
func NewClusterSchema(httpClient *http.Client) *ClusterSchema {
return &ClusterSchema{client: httpClient}
}
func (c *ClusterSchema) OpenTransaction(ctx context.Context, host string,
tx *cluster.Transaction,
) error {
path := "/schema/transactions/"
method := http.MethodPost
url := url.URL{Scheme: "http", Host: host, Path: path}
pl := txPayload{
Type: tx.Type,
ID: tx.ID,
Payload: tx.Payload,
DeadlineMilli: tx.Deadline.UnixMilli(),
}
jsonBytes, err := json.Marshal(pl)
if err != nil {
return fmt.Errorf("marshal transaction payload: %w", err)
}
req, err := http.NewRequestWithContext(ctx, method, url.String(),
bytes.NewReader(jsonBytes))
if err != nil {
return fmt.Errorf("open http request: %w", err)
}
req.Header.Set("content-type", "application/json")
res, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("send http request: %w", err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
if res.StatusCode != http.StatusCreated {
if res.StatusCode == http.StatusConflict {
return cluster.ErrConcurrentTransaction
}
return fmt.Errorf("unexpected status code %d (%s)", res.StatusCode,
body)
}
// optional for backward-compatibility before v1.17 where only
// write-transactions where supported. They had no return value other than
// the status code. With the introduction of read-transactions it is now
// possible to return the requested value
if len(body) == 0 {
return nil
}
var txRes txResponsePayload
err = json.Unmarshal(body, &txRes)
if err != nil {
return fmt.Errorf("unexpected error unmarshalling tx response: %w", err)
}
if tx.ID != txRes.ID {
return fmt.Errorf("unexpected mismatch between outgoing and incoming tx ids:"+
"%s vs %s", tx.ID, txRes.ID)
}
tx.Payload = txRes.Payload
return nil
}
func (c *ClusterSchema) AbortTransaction(ctx context.Context, host string,
tx *cluster.Transaction,
) error {
path := "/schema/transactions/" + tx.ID
method := http.MethodDelete
url := url.URL{Scheme: "http", Host: host, Path: path}
req, err := http.NewRequestWithContext(ctx, method, url.String(), nil)
if err != nil {
return fmt.Errorf("open http request: %w", err)
}
res, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("send http request: %w", err)
}
defer res.Body.Close()
if res.StatusCode != http.StatusNoContent {
errBody, _ := io.ReadAll(res.Body)
return fmt.Errorf("unexpected status code %d: %s", res.StatusCode, errBody)
}
return nil
}
func (c *ClusterSchema) CommitTransaction(ctx context.Context, host string,
tx *cluster.Transaction,
) error {
path := "/schema/transactions/" + tx.ID + "/commit"
method := http.MethodPut
url := url.URL{Scheme: "http", Host: host, Path: path}
req, err := http.NewRequestWithContext(ctx, method, url.String(), nil)
if err != nil {
return fmt.Errorf("open http request: %w", err)
}
res, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("send http request: %w", err)
}
defer res.Body.Close()
if res.StatusCode != http.StatusNoContent {
errBody, _ := io.ReadAll(res.Body)
return fmt.Errorf("unexpected status code %d: %s", res.StatusCode, errBody)
}
return nil
}
type txPayload struct {
Type cluster.TransactionType `json:"type"`
ID string `json:"id"`
Payload interface{} `json:"payload"`
DeadlineMilli int64 `json:"deadlineMilli"`
}
type txResponsePayload struct {
Type cluster.TransactionType `json:"type"`
ID string `json:"id"`
Payload json.RawMessage `json:"payload"`
}
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