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Add
Stream method for running a model and streaming its output (#29)
* Rename replicate_test.go to client_test.go * Add Stream method * Support streaming official language models * Fix streaming implementation * Consolidate error into errChan * Handle closed lineChan
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| package replicate | ||
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| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "unicode/utf8" | ||
|
|
||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
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| var ( | ||
| ErrInvalidUTF8Data = errors.New("invalid UTF-8 data") | ||
| ) | ||
|
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| // SSEEvent represents a Server-Sent Event. | ||
| type SSEEvent struct { | ||
| Type string | ||
| ID string | ||
| Data string | ||
| } | ||
|
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| func (e *SSEEvent) decode(b []byte) error { | ||
| data := [][]byte{} | ||
| for _, line := range bytes.Split(b, []byte("\n")) { | ||
| // Parse field and value from line | ||
| parts := bytes.SplitN(line, []byte{':'}, 2) | ||
| field := string(parts[0]) | ||
| var value []byte | ||
| if len(parts) == 2 { | ||
| value = parts[1] | ||
| // Trim leading space if present | ||
| value, _ = bytes.CutPrefix(value, []byte(" ")) | ||
| } | ||
|
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| switch field { | ||
| case "id": | ||
| e.ID = string(value) | ||
| case "event": | ||
| e.Type = string(value) | ||
| case "data": | ||
| data = append(data, value) | ||
| default: | ||
| // ignore | ||
| } | ||
| } | ||
|
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| if !utf8.Valid(bytes.Join(data, []byte("\n"))) { | ||
| return ErrInvalidUTF8Data | ||
| } | ||
|
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| e.Data = string(bytes.Join(data, []byte("\n"))) | ||
|
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| return nil | ||
| } | ||
|
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| // Stream runs a model with the given input and returns a streams its output. | ||
| func (r *Client) Stream(ctx context.Context, identifier string, input PredictionInput, webhook *Webhook) (<-chan SSEEvent, <-chan error) { | ||
| sseChan := make(chan SSEEvent, 64) | ||
| errChan := make(chan error, 64) | ||
|
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| done := make(chan struct{}) | ||
|
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| g, ctx := errgroup.WithContext(ctx) | ||
| g.Go(func() error { | ||
| id, err := ParseIdentifier(identifier) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| var prediction *Prediction | ||
| if id.Version == nil { | ||
| prediction, err = r.CreatePredictionWithModel(ctx, id.Owner, id.Name, input, webhook, true) | ||
| } else { | ||
| prediction, err = r.CreatePrediction(ctx, *id.Version, input, webhook, true) | ||
| } | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| url := prediction.URLs["stream"] | ||
| if url == "" { | ||
| return errors.New("streaming not supported") | ||
| } | ||
|
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| req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create request: %w", err) | ||
| } | ||
| req.Header.Set("Accept", "text/event-stream") | ||
| req.Header.Set("Cache-Control", "no-cache") | ||
| req.Header.Set("Connection", "keep-alive") | ||
|
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| resp, err := r.c.Do(req) | ||
| if err != nil { | ||
| resp.Body.Close() | ||
| return fmt.Errorf("failed to send request: %w", err) | ||
| } | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| return fmt.Errorf("received invalid status code %d", resp.StatusCode) | ||
| } | ||
|
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| r := bufio.NewReader(resp.Body) | ||
| var buf bytes.Buffer | ||
| lineChan := make(chan []byte) | ||
|
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| g.Go(func() error { | ||
| defer close(lineChan) | ||
|
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| for { | ||
| select { | ||
| case <-done: | ||
| return nil | ||
| default: | ||
| line, err := r.ReadBytes('\n') | ||
| if err != nil { | ||
| defer resp.Body.Close() | ||
| if err == io.EOF { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
| lineChan <- line | ||
| } | ||
| } | ||
| }) | ||
|
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||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| case b, ok := <-lineChan: | ||
| if !ok { | ||
| return nil | ||
| } | ||
|
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| buf.Write(b) | ||
|
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| if bytes.Equal(b, []byte("\n")) { | ||
| b := buf.Bytes() | ||
| buf.Reset() | ||
|
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| event := SSEEvent{Type: "message"} | ||
| if err := event.decode(b); err != nil { | ||
| errChan <- err | ||
| } | ||
|
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| switch event.Type { | ||
| case "error": | ||
| errChan <- unmarshalAPIError([]byte(event.Data)) | ||
| case "done": | ||
| close(done) | ||
| return nil | ||
| default: | ||
| sseChan <- event | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }) | ||
|
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| go func() { | ||
| defer close(sseChan) | ||
| defer close(errChan) | ||
|
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| err := g.Wait() | ||
| if err != nil { | ||
| errChan <- err | ||
| } | ||
| }() | ||
|
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| return sseChan, errChan | ||
| } |