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gemini.go
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gemini.go
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package gemini
import (
"context"
"fmt"
"github.com/google/generative-ai-go/genai"
"google.golang.org/api/option"
"github.com/amikos-tech/chroma-go/types"
)
// Docs: https://developers.cloudflare.com/workers-ai/ (Cloudflare Workers AI) and https://developers.cloudflare.com/workers-ai/models/embedding/ (Embedding API)
const (
DefaultEmbeddingModel = "text-embedding-004"
ModelContextVar = "model"
APIKeyEnvVar = "GEMINI_API_KEY"
)
type Client struct {
apiKey string
DefaultModel string
Client *genai.Client
DefaultContext *context.Context
MaxBatchSize int
}
func applyDefaults(c *Client) (err error) {
if c.DefaultModel == "" {
c.DefaultModel = DefaultEmbeddingModel
}
if c.DefaultContext == nil {
ctx := context.Background()
c.DefaultContext = &ctx
}
if c.Client == nil {
c.Client, err = genai.NewClient(*c.DefaultContext, option.WithAPIKey(c.apiKey))
if err != nil {
return err
}
}
return nil
}
func validate(c *Client) error {
if c.apiKey == "" {
return fmt.Errorf("API key is required")
}
return nil
}
func NewGeminiClient(opts ...Option) (*Client, error) {
client := &Client{}
for _, opt := range opts {
err := opt(client)
if err != nil {
return nil, err
}
}
err := applyDefaults(client)
if err != nil {
return nil, err
}
if err := validate(client); err != nil {
return nil, err
}
return client, nil
}
func (c *Client) CreateEmbedding(ctx context.Context, req []string) ([]*types.Embedding, error) {
var em *genai.EmbeddingModel
if ctx.Value(ModelContextVar) != nil {
em = c.Client.EmbeddingModel(ctx.Value(ModelContextVar).(string))
} else {
em = c.Client.EmbeddingModel(c.DefaultModel)
}
b := em.NewBatch()
for _, t := range req {
b.AddContent(genai.Text(t))
}
res, err := em.BatchEmbedContents(ctx, b)
if err != nil {
return nil, err
}
var embeddings = make([][]float32, 0)
for _, e := range res.Embeddings {
embeddings = append(embeddings, e.Values)
}
return types.NewEmbeddingsFromFloat32(embeddings), nil
}
// close closes the underlying client
//
//nolint:unused
func (c *Client) close() error {
return c.Client.Close()
}
var _ types.EmbeddingFunction = (*GeminiEmbeddingFunction)(nil)
type GeminiEmbeddingFunction struct {
apiClient *Client
}
func NewGeminiEmbeddingFunction(opts ...Option) (*GeminiEmbeddingFunction, error) {
client, err := NewGeminiClient(opts...)
if err != nil {
return nil, err
}
return &GeminiEmbeddingFunction{apiClient: client}, nil
}
// close closes the underlying client
//
//nolint:unused
func (e *GeminiEmbeddingFunction) close() error {
return e.apiClient.close()
}
func (e *GeminiEmbeddingFunction) EmbedDocuments(ctx context.Context, documents []string) ([]*types.Embedding, error) {
if e.apiClient.MaxBatchSize > 0 && len(documents) > e.apiClient.MaxBatchSize {
return nil, fmt.Errorf("number of documents exceeds the maximum batch size %v", e.apiClient.MaxBatchSize)
}
if len(documents) == 0 {
return types.NewEmbeddingsFromFloat32(nil), nil
}
response, err := e.apiClient.CreateEmbedding(ctx, documents)
if err != nil {
return nil, err
}
return response, nil
}
func (e *GeminiEmbeddingFunction) EmbedQuery(ctx context.Context, document string) (*types.Embedding, error) {
response, err := e.apiClient.CreateEmbedding(ctx, []string{document})
if err != nil {
return nil, err
}
return response[0], nil
}
func (e *GeminiEmbeddingFunction) EmbedRecords(ctx context.Context, records []*types.Record, force bool) error {
return types.EmbedRecordsDefaultImpl(e, ctx, records, force)
}