github.com/weaviate/weaviate@v1.24.6/modules/img2vec-neural/clients/vectorizer.go (about)

     1  //                           _       _
     2  // __      _____  __ ___   ___  __ _| |_ ___
     3  // \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
     4  //  \ V  V /  __/ (_| |\ V /| | (_| | ||  __/
     5  //   \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
     6  //
     7  //  Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
     8  //
     9  //  CONTACT: hello@weaviate.io
    10  //
    11  
    12  package clients
    13  
    14  import (
    15  	"bytes"
    16  	"context"
    17  	"encoding/json"
    18  	"fmt"
    19  	"io"
    20  	"net/http"
    21  	"time"
    22  
    23  	"github.com/pkg/errors"
    24  	"github.com/sirupsen/logrus"
    25  	"github.com/weaviate/weaviate/modules/img2vec-neural/ent"
    26  )
    27  
    28  type vectorizer struct {
    29  	origin     string
    30  	httpClient *http.Client
    31  	logger     logrus.FieldLogger
    32  }
    33  
    34  func New(origin string, timeout time.Duration, logger logrus.FieldLogger) *vectorizer {
    35  	return &vectorizer{
    36  		origin: origin,
    37  		httpClient: &http.Client{
    38  			Timeout: timeout,
    39  		},
    40  		logger: logger,
    41  	}
    42  }
    43  
    44  func (v *vectorizer) Vectorize(ctx context.Context,
    45  	id, image string,
    46  ) (*ent.VectorizationResult, error) {
    47  	body, err := json.Marshal(vecRequest{
    48  		ID:    id,
    49  		Image: image,
    50  	})
    51  	if err != nil {
    52  		return nil, errors.Wrapf(err, "marshal body")
    53  	}
    54  
    55  	req, err := http.NewRequestWithContext(ctx, "POST", v.url("/vectors"),
    56  		bytes.NewReader(body))
    57  	if err != nil {
    58  		return nil, errors.Wrap(err, "create POST request")
    59  	}
    60  
    61  	res, err := v.httpClient.Do(req)
    62  	if err != nil {
    63  		return nil, errors.Wrap(err, "send POST request")
    64  	}
    65  	defer res.Body.Close()
    66  
    67  	bodyBytes, err := io.ReadAll(res.Body)
    68  	if err != nil {
    69  		return nil, errors.Wrap(err, "read response body")
    70  	}
    71  
    72  	var resBody vecResponse
    73  	if err := json.Unmarshal(bodyBytes, &resBody); err != nil {
    74  		return nil, errors.Wrap(err, "unmarshal response body")
    75  	}
    76  
    77  	if res.StatusCode > 399 {
    78  		return nil, errors.Errorf("fail with status %d", res.StatusCode)
    79  	}
    80  
    81  	return &ent.VectorizationResult{
    82  		ID:         resBody.ID,
    83  		Image:      image,
    84  		Dimensions: resBody.Dim,
    85  		Vector:     resBody.Vector,
    86  	}, nil
    87  }
    88  
    89  func (v *vectorizer) url(path string) string {
    90  	return fmt.Sprintf("%s%s", v.origin, path)
    91  }
    92  
    93  type vecRequest struct {
    94  	ID    string `json:"id"`
    95  	Image string `json:"image"`
    96  }
    97  
    98  type vecResponse struct {
    99  	ID     string    `json:"id"`
   100  	Vector []float32 `json:"vector"`
   101  	Dim    int       `json:"dim"`
   102  	Error  string    `json:"error"`
   103  }