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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"runtime"
"sync"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/weaviate/weaviate/entities/moduletools"
"github.com/weaviate/weaviate/usecases/modulecomponents/ent"
"golang.org/x/sync/errgroup"
)
var _NUMCPU = runtime.NumCPU()
type client struct {
lock sync.RWMutex
origin string
httpClient *http.Client
maxDocuments int
logger logrus.FieldLogger
}
func New(origin string, timeout time.Duration, logger logrus.FieldLogger) *client {
return &client{
origin: origin,
httpClient: &http.Client{Timeout: timeout},
maxDocuments: 32,
logger: logger,
}
}
func (c *client) Rank(ctx context.Context,
query string, documents []string, cfg moduletools.ClassConfig,
) (*ent.RankResult, error) {
eg := &errgroup.Group{}
eg.SetLimit(_NUMCPU)
chunkedDocuments := c.chunkDocuments(documents, c.maxDocuments)
documentScoreResponses := make([][]DocumentScore, len(chunkedDocuments))
for i := range chunkedDocuments {
i := i // https://golang.org/doc/faq#closures_and_goroutines
eg.Go(func() error {
documentScoreResponse, err := c.performRank(ctx, query, chunkedDocuments[i], cfg)
if err != nil {
return err
}
c.lockGuard(func() {
documentScoreResponses[i] = documentScoreResponse
})
return nil
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
return c.toRankResult(query, documentScoreResponses), nil
}
func (c *client) lockGuard(mutate func()) {
c.lock.Lock()
defer c.lock.Unlock()
mutate()
}
func (c *client) toRankResult(query string, scores [][]DocumentScore) *ent.RankResult {
documentScores := []ent.DocumentScore{}
for _, docScores := range scores {
for i := range docScores {
documentScores = append(documentScores, ent.DocumentScore{
Document: docScores[i].Document,
Score: docScores[i].Score,
})
}
}
return &ent.RankResult{
Query: query,
DocumentScores: documentScores,
}
}
func (c *client) performRank(ctx context.Context,
query string, documents []string, cfg moduletools.ClassConfig,
) ([]DocumentScore, error) {
body, err := json.Marshal(RankInput{
Query: query,
Documents: documents,
})
if err != nil {
return nil, errors.Wrapf(err, "marshal body")
}
req, err := http.NewRequestWithContext(ctx, "POST", c.url("/rerank"),
bytes.NewReader(body))
if err != nil {
return nil, errors.Wrap(err, "create POST request")
}
res, err := c.httpClient.Do(req)
if err != nil {
return nil, errors.Wrap(err, "send POST request")
}
defer res.Body.Close()
bodyBytes, err := io.ReadAll(res.Body)
if err != nil {
return nil, errors.Wrap(err, "read response body")
}
var resBody RankResponse
if err := json.Unmarshal(bodyBytes, &resBody); err != nil {
return nil, errors.Wrap(err, "unmarshal response body")
}
if res.StatusCode != 200 {
if resBody.Error != "" {
return nil, errors.Errorf("fail with status %d: %s", res.StatusCode,
resBody.Error)
}
return nil, errors.Errorf("fail with status %d", res.StatusCode)
}
return resBody.Scores, nil
}
func (c *client) chunkDocuments(documents []string, chunkSize int) [][]string {
var requests [][]string
for i := 0; i < len(documents); i += chunkSize {
end := i + chunkSize
if end > len(documents) {
end = len(documents)
}
requests = append(requests, documents[i:end])
}
return requests
}
func (c *client) url(path string) string {
return fmt.Sprintf("%s%s", c.origin, path)
}
type RankInput struct {
Query string `json:"query"`
Documents []string `json:"documents"`
RankPropertyValue string `json:"property"`
}
type DocumentScore struct {
Document string `json:"document"`
Score float64 `json:"score"`
}
type RankResponse struct {
Query string `json:"query"`
Scores []DocumentScore `json:"scores"`
RankPropertyValue string `json:"property"`
Score float64 `json:"score"`
Error string `json:"error"`
}
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