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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,210 @@ | ||
| package bedrock | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/sha256" | ||
| "encoding/base64" | ||
| "encoding/hex" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-sdk-go-v2/aws" | ||
| "github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream" | ||
| "github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream/eventstreamapi" | ||
| v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4" | ||
| "github.com/aws/aws-sdk-go-v2/config" | ||
| "github.com/tidwall/gjson" | ||
| "github.com/tidwall/sjson" | ||
|
|
||
| "github.com/anthropics/anthropic-sdk-go/internal/requestconfig" | ||
| "github.com/anthropics/anthropic-sdk-go/option" | ||
| "github.com/anthropics/anthropic-sdk-go/packages/ssestream" | ||
| ) | ||
|
|
||
| const DefaultVersion = "bedrock-2023-05-31" | ||
|
|
||
| var DefaultEndpoints = map[string]bool{ | ||
| "/v1/complete": true, | ||
| "/v1/messages": true, | ||
| } | ||
|
|
||
| type eventstreamChunk struct { | ||
| Bytes string `json:"bytes"` | ||
| P string `json:"p"` | ||
| } | ||
|
|
||
| type eventstreamDecoder struct { | ||
| eventstream.Decoder | ||
|
|
||
| rc io.ReadCloser | ||
| evt ssestream.Event | ||
| err error | ||
| } | ||
|
|
||
| func (e *eventstreamDecoder) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| func (e *eventstreamDecoder) Err() error { | ||
| return nil | ||
| } | ||
|
|
||
| func (e *eventstreamDecoder) Next() bool { | ||
| if e.err != nil { | ||
| return false | ||
| } | ||
|
|
||
| msg, err := e.Decoder.Decode(e.rc, nil) | ||
| if err != nil { | ||
| e.err = err | ||
| return false | ||
| } | ||
|
|
||
| messageType := msg.Headers.Get(eventstreamapi.MessageTypeHeader) | ||
| if messageType == nil { | ||
| e.err = fmt.Errorf("%s event header not present", eventstreamapi.MessageTypeHeader) | ||
| return false | ||
| } | ||
|
|
||
| switch messageType.String() { | ||
| case eventstreamapi.EventMessageType: | ||
| eventType := msg.Headers.Get(eventstreamapi.EventTypeHeader) | ||
| if eventType == nil { | ||
| e.err = fmt.Errorf("%s event header not present", eventstreamapi.EventTypeHeader) | ||
| return false | ||
| } | ||
|
|
||
| if eventType.String() == "chunk" { | ||
| chunk := eventstreamChunk{} | ||
| err = json.Unmarshal(msg.Payload, &chunk) | ||
| if err != nil { | ||
| e.err = err | ||
| return false | ||
| } | ||
| decoded, err := base64.StdEncoding.DecodeString(chunk.Bytes) | ||
| if err != nil { | ||
| e.err = err | ||
| return false | ||
| } | ||
| e.evt = ssestream.Event{ | ||
| Type: gjson.GetBytes(decoded, "type").String(), | ||
| Data: decoded, | ||
| } | ||
| } | ||
|
|
||
| case eventstreamapi.ExceptionMessageType: | ||
| case eventstreamapi.ErrorMessageType: | ||
| errorCode := "UnknownError" | ||
| errorMessage := errorCode | ||
| if header := msg.Headers.Get(eventstreamapi.ErrorCodeHeader); header != nil { | ||
| errorCode = header.String() | ||
| } | ||
| if header := msg.Headers.Get(eventstreamapi.ErrorMessageHeader); header != nil { | ||
| errorMessage = header.String() | ||
| } | ||
| e.err = fmt.Errorf("received error or exception %s: %s", errorCode, errorMessage) | ||
| return false | ||
| } | ||
|
|
||
| return true | ||
| } | ||
|
|
||
| func (e *eventstreamDecoder) Event() ssestream.Event { | ||
| return e.evt | ||
| } | ||
|
|
||
| var ( | ||
| _ ssestream.Decoder = &eventstreamDecoder{} | ||
| ) | ||
|
|
||
| func init() { | ||
| ssestream.RegisterDecoder("application/vnd.amazon.eventstream", func(rc io.ReadCloser) ssestream.Decoder { | ||
| return &eventstreamDecoder{rc: rc} | ||
| }) | ||
| } | ||
|
|
||
| // WithLoadDefaultConfig returns a request option which loads the default config for Amazon and registers | ||
| // middleware that intercepts request to the Messages API so that this SDK can be used with Amazon Bedrock. | ||
| // | ||
| // If you already have an [aws.Config], it is recommended that you instead call [WithConfig] directly. | ||
| func WithLoadDefaultConfig(ctx context.Context, optFns ...func(*config.LoadOptions) error) option.RequestOption { | ||
| cfg, err := config.LoadDefaultConfig(ctx, optFns...) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return WithConfig(cfg) | ||
| } | ||
|
|
||
| // WithConfig returns a request option which uses the provided config and registers middleware that | ||
| // intercepts request to the Messages API so that this SDK can be used with Amazon Bedrock. | ||
| func WithConfig(cfg aws.Config) option.RequestOption { | ||
| signer := v4.NewSigner() | ||
| middleware := bedrockMiddleware(signer, cfg) | ||
|
|
||
| return func(rc *requestconfig.RequestConfig) error { | ||
| return rc.Apply( | ||
| option.WithBaseURL(fmt.Sprintf("https://bedrock-runtime.%s.amazonaws.com", cfg.Region)), | ||
| option.WithMiddleware(middleware), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| func bedrockMiddleware(signer *v4.Signer, cfg aws.Config) option.Middleware { | ||
| return func(r *http.Request, next option.MiddlewareNext) (res *http.Response, err error) { | ||
| var body []byte | ||
| if r.Body != nil { | ||
| body, err = io.ReadAll(r.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| r.Body.Close() | ||
|
|
||
| if !gjson.GetBytes(body, "anthropic_version").Exists() { | ||
| body, _ = sjson.SetBytes(body, "anthropic_version", DefaultVersion) | ||
| } | ||
|
|
||
| if r.Method == http.MethodPost && DefaultEndpoints[r.URL.Path] { | ||
| model := gjson.GetBytes(body, "model").String() | ||
| stream := gjson.GetBytes(body, "stream").Bool() | ||
|
|
||
| body, _ = sjson.DeleteBytes(body, "model") | ||
| body, _ = sjson.DeleteBytes(body, "stream") | ||
|
|
||
| var path string | ||
| if stream { | ||
| path = fmt.Sprintf("/model/%s/invoke-with-response-stream", model) | ||
| } else { | ||
| path = fmt.Sprintf("/model/%s/invoke", model) | ||
| } | ||
|
|
||
| r.URL.Path = path | ||
| } | ||
|
|
||
| reader := bytes.NewReader(body) | ||
| r.Body = io.NopCloser(reader) | ||
| r.GetBody = func() (io.ReadCloser, error) { | ||
| _, err := reader.Seek(0, 0) | ||
| return io.NopCloser(reader), err | ||
| } | ||
| r.ContentLength = int64(len(body)) | ||
| } | ||
|
|
||
| ctx := r.Context() | ||
| credentials, err := cfg.Credentials.Retrieve(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| hash := sha256.Sum256(body) | ||
| err = signer.SignHTTP(ctx, credentials, r, hex.EncodeToString(hash[:]), "bedrock", cfg.Region, time.Now()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return next(r) | ||
| } | ||
| } |
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