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Yang Luo
2023-12-01 10:02:48 +08:00
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.gitignore
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# If you prefer the allow list template instead of the deny list, see community template:
# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
#
# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib
# Test binary, built with `go test -c`
*.test
# Output of the go coverage tool, specifically when used with LiteIDE
*.out
# Dependency directories (remove the comment below to include it)
# vendor/
# Go workspace file
go.work
.idea/
*.iml
LICENSE
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Apache License
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http://www.apache.org/licenses/
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README.md
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# go-openrouter
chat.go
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package openrouter
import (
"context"
"errors"
"net/http"
)
// Chat message role defined by the Sensa API.
type ModelName string
const (
ChatMessageRoleUser = "user"
ChatMessageRoleSystem = "system"
ChatMessageRoleAssistant = "assistant"
)
var (
ErrChatCompletionStreamNotSupported = errors.New("streaming is not supported with this method, please use CreateChatCompletionStream") //nolint:lll
ErrCompletionUnsupportedModel = errors.New("this model is not supported with this method") //nolint:lll
)
// CreateChatCompletion — API call to Create a completion for the chat message.
func (c *Client) CreateChatCompletion(
ctx context.Context,
request *ChatCompletionRequest,
) (response *ChatCompletionResponse, err error) {
if request.Stream {
err = ErrChatCompletionStreamNotSupported
return
}
urlSuffix := "/chat/completions"
request.Model = wrapperModels[request.Model]
if !checkSupportsModel(request.Model) {
err = ErrCompletionUnsupportedModel
return
}
req, err := c.requestBuilder.Build(ctx, http.MethodPost, c.fullURL(urlSuffix), request)
if err != nil {
return
}
err = c.sendRequest(req, &response)
return
}
chat_stream.go
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package openrouter
import (
"bufio"
"context"
utils "github.com/casibase/go-openrouter/internal"
)
type ChatCompletionStream struct {
streamReader
}
// CreateChatCompletionStream — API call to create a chat completion w/ streaming
// support. It sets whether to stream back partial progress. If set, tokens will be
// sent as data-only server-sent events as they become available, with the
// stream terminated by a data: [DONE] message.
func (c *Client) CreateChatCompletionStream(
ctx context.Context,
request *ChatCompletionRequest,
) (stream *ChatCompletionStream, err error) {
urlSuffix := "/chat/completions"
request.Model = wrapperModels[request.Model]
if !checkSupportsModel(request.Model) {
err = ErrCompletionUnsupportedModel
return
}
request.Stream = true
req, err := c.newStreamRequest(ctx, "POST", urlSuffix, request)
if err != nil {
return
}
resp, err := c.config.HTTPClient.Do(req) //nolint:bodyclose // body is closed in stream.Close()
if err != nil {
return
}
if isFailureStatusCode(resp) {
return nil, c.handleErrorResp(resp)
}
stream = &ChatCompletionStream{
streamReader: streamReader{
emptyMessagesLimit: c.config.EmptyMessagesLimit,
reader: bufio.NewReader(resp.Body),
response: resp,
errAccumulator: utils.NewErrorAccumulator(),
unmarshaler: &utils.JSONUnmarshaler{},
},
}
return
}
chat_test.go
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package openrouter
import (
"context"
"testing"
)
func TestClient_CreateChatCompletion(t *testing.T) {
client, _ := NewClient("", "", "")
req := &ChatCompletionRequest{
Model: "claude-2",
Messages: []ChatCompletionMessage{
{
Role: ChatMessageRoleSystem,
Content: "You are a helpful assistant.",
},
{
Role: ChatMessageRoleUser,
Content: "what is today",
},
},
Stream: false,
Temperature: nil,
TopP: nil,
}
t.Log(client.CreateChatCompletion(context.Background(), req))
//
//r, err := client.CreateChatCompletionStream(context.Background(), req)
//if err != nil {
// t.Error(err)
//}
//t.Log(r)
//for {
// fmt.Println(1)
// r, err := r.Recv()
// if err != nil {
// fmt.Println(err.Error())
// if errors.Is(err, io.EOF) {
// fmt.Println(1)
// break
// }
// t.Error(err)
// }
// t.Logf("%#v", r.Choices)
//}
}
client.go
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package openrouter
import (
"context"
"encoding/json"
"fmt"
utils "github.com/casibase/go-openrouter/internal"
"io"
"net/http"
)
type Client struct {
config ClientConfig
requestBuilder utils.RequestBuilder
}
func NewClient(auth, xTitle, httpReferer string) (*Client, error) {
config, err := DefaultConfig(auth, xTitle, httpReferer)
if err != nil {
return nil, err
}
return NewClientWithConfig(config), nil
}
func NewClientWithConfig(config ClientConfig) *Client {
return &Client{
config: config,
requestBuilder: utils.NewRequestBuilder(),
}
}
func (c *Client) sendRequest(req *http.Request, v any) error {
req.Header.Set("Accept", "application/json; charset=utf-8")
// Check whether Content-Type is already set, Upload Files API requires
// Content-Type == multipart/form-data
contentType := req.Header.Get("Content-Type")
if contentType == "" {
req.Header.Set("Content-Type", "application/json; charset=utf-8")
}
c.setCommonHeaders(req)
res, err := c.config.HTTPClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
if isFailureStatusCode(res) {
return c.handleErrorResp(res)
}
return decodeResponse(res.Body, v)
}
func (c *Client) setCommonHeaders(req *http.Request) {
req.Header.Set("HTTP-Referer", c.config.HttpReferer)
req.Header.Set("X-Title", c.config.XTitle)
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.config.authToken))
}
func isFailureStatusCode(resp *http.Response) bool {
return resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusBadRequest
}
func decodeResponse(body io.Reader, v any) error {
if v == nil {
return nil
}
if result, ok := v.(*string); ok {
return decodeString(body, result)
}
return json.NewDecoder(body).Decode(v)
}
func decodeString(body io.Reader, output *string) error {
b, err := io.ReadAll(body)
if err != nil {
return err
}
*output = string(b)
return nil
}
// fullURL returns full URL for request.
// args[0] is model name, if API type is Azure, model name is required to get deployment name.
func (c *Client) fullURL(suffix string) string {
return fmt.Sprintf("%s%s", c.config.BaseURL, suffix)
}
func (c *Client) newStreamRequest(
ctx context.Context,
method string,
urlSuffix string,
body any) (*http.Request, error) {
req, err := c.requestBuilder.Build(ctx, method, c.fullURL(urlSuffix), body)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "text/event-stream")
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Connection", "keep-alive")
c.setCommonHeaders(req)
return req, nil
}
func (c *Client) handleErrorResp(resp *http.Response) error {
var errRes ErrorResponse
err := json.NewDecoder(resp.Body).Decode(&errRes)
if err != nil || errRes.Error == nil {
reqErr := &RequestError{
HTTPStatusCode: resp.StatusCode,
Err: err,
}
if errRes.Error != nil {
reqErr.Err = errRes.Error
}
return reqErr
}
errRes.Error.HTTPStatusCode = resp.StatusCode
return errRes.Error
}
config.go
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package openrouter
import (
"net/http"
)
const (
routerAPIURLv1 = "https://openrouter.ai/api/v1"
defaultEmptyMessagesLimit uint = 300
)
// ClientConfig is a configuration of a client.
// XTitle、HttpRefer your own site url
type ClientConfig struct {
authToken string
XTitle string
HttpReferer string
BaseURL string
HTTPClient *http.Client
EmptyMessagesLimit uint
}
func DefaultConfig(auth, xTitle, httpReferer string) (ClientConfig, error) {
return ClientConfig{
authToken: auth,
HTTPClient: &http.Client{},
XTitle: xTitle,
HttpReferer: httpReferer,
BaseURL: routerAPIURLv1,
EmptyMessagesLimit: defaultEmptyMessagesLimit,
}, nil
}
func (c ClientConfig) WithHttpClientConfig(client *http.Client) ClientConfig {
c.HTTPClient = client
return c
}
error.go
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package openrouter
import (
"encoding/json"
"fmt"
)
// APIError provides error information returned by the OpenAI API.
type APIError struct {
Code any `json:"code,omitempty"`
Message string `json:"message"`
Details any `json:"details"`
HTTPStatusCode int `json:"-"`
}
// RequestError provides informations about generic request errors.
type RequestError struct {
HTTPStatusCode int
Err error
}
type ErrorResponse struct {
Error *APIError `json:"error,omitempty"`
}
func (e *APIError) Error() string {
if e.HTTPStatusCode > 0 {
return fmt.Sprintf("error, status code: %d, message: %s", e.HTTPStatusCode, e.Message)
}
return e.Message
}
func (e *APIError) UnmarshalJSON(data []byte) (err error) {
var rawMap map[string]json.RawMessage
err = json.Unmarshal(data, &rawMap)
if err != nil {
return
}
err = json.Unmarshal(rawMap["message"], &e.Message)
if err != nil {
return
}
if _, ok := rawMap["code"]; !ok {
return nil
}
// if the api returned a number, we need to force an integer
// since the json package defaults to float64
var intCode int
err = json.Unmarshal(rawMap["code"], &intCode)
if err == nil {
e.Code = intCode
return nil
}
return json.Unmarshal(rawMap["code"], &e.Code)
}
func (e *RequestError) Error() string {
return fmt.Sprintf("error, status code: %d, message: %s", e.HTTPStatusCode, e.Err)
}
func (e *RequestError) Unwrap() error {
return e.Err
}
go.mod
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module github.com/casibase/go-openrouter
go 1.19
internal/error_accumulator.go
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package internal
import (
"bytes"
"fmt"
"io"
)
type ErrorAccumulator interface {
Write(p []byte) error
Bytes() []byte
}
type errorBuffer interface {
io.Writer
Len() int
Bytes() []byte
}
type DefaultErrorAccumulator struct {
Buffer errorBuffer
}
func NewErrorAccumulator() ErrorAccumulator {
return &DefaultErrorAccumulator{
Buffer: &bytes.Buffer{},
}
}
func (e *DefaultErrorAccumulator) Write(p []byte) error {
_, err := e.Buffer.Write(p)
if err != nil {
return fmt.Errorf("error accumulator write error, %w", err)
}
return nil
}
func (e *DefaultErrorAccumulator) Bytes() (errBytes []byte) {
if e.Buffer.Len() == 0 {
return
}
errBytes = e.Buffer.Bytes()
return
}
internal/marshaller.go
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package internal
import (
"encoding/json"
)
type Marshaller interface {
Marshal(value any) ([]byte, error)
}
type JSONMarshaller struct{}
func (jm *JSONMarshaller) Marshal(value any) ([]byte, error) {
return json.Marshal(value)
}
internal/request_builder.go
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package internal
import (
"bytes"
"context"
"net/http"
)
type RequestBuilder interface {
Build(ctx context.Context, method, url string, request any) (*http.Request, error)
}
type HTTPRequestBuilder struct {
marshaller Marshaller
}
func NewRequestBuilder() *HTTPRequestBuilder {
return &HTTPRequestBuilder{
marshaller: &JSONMarshaller{},
}
}
func (b *HTTPRequestBuilder) Build(ctx context.Context, method, url string, request any) (*http.Request, error) {
if request == nil {
return http.NewRequestWithContext(ctx, method, url, nil)
}
var reqBytes []byte
reqBytes, err := b.marshaller.Marshal(request)
if err != nil {
return nil, err
}
return http.NewRequestWithContext(
ctx,
method,
url,
bytes.NewBuffer(reqBytes),
)
}
internal/unmarshaler.go
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package internal
import (
"encoding/json"
)
type Unmarshaler interface {
Unmarshal(data []byte, v any) error
}
type JSONUnmarshaler struct{}
func (jm *JSONUnmarshaler) Unmarshal(data []byte, v any) error {
return json.Unmarshal(data, v)
}
stream_reader.go
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package openrouter
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"net/http"
utils "github.com/casibase/go-openrouter/internal"
)
var (
ErrTooManyEmptyStreamMessages = errors.New("stream has sent too many empty messages")
)
type streamReader struct {
emptyMessagesLimit uint
isFinished bool
reader *bufio.Reader
response *http.Response
errAccumulator utils.ErrorAccumulator
unmarshaler utils.Unmarshaler
}
func (stream *streamReader) Recv() (response *ChatCompletionResponse, err error) {
if stream.isFinished {
err = io.EOF
return
}
response, err = stream.processLines()
return
}
func (stream *streamReader) processLines() (*ChatCompletionResponse, error) {
var emptyMessagesCount uint
for {
rawLine, readErr := stream.reader.ReadBytes('\n')
if readErr != nil {
respErr := stream.unmarshalError()
if respErr != nil {
return nil, fmt.Errorf("error, %w", respErr.Error)
}
return nil, readErr
}
var headerData = []byte("data:")
noSpaceLine := bytes.TrimSpace(rawLine)
if !bytes.HasPrefix(noSpaceLine, headerData) {
writeErr := stream.errAccumulator.Write(noSpaceLine)
if writeErr != nil {
return nil, writeErr
}
emptyMessagesCount++
if emptyMessagesCount > stream.emptyMessagesLimit {
return nil, ErrTooManyEmptyStreamMessages
}
continue
}
noPrefixLine := bytes.TrimSpace(bytes.TrimPrefix(noSpaceLine, headerData))
if string(noPrefixLine) == "[DONE]" {
stream.isFinished = true
return nil, io.EOF
}
var response ChatCompletionResponse
unmarshalErr := stream.unmarshaler.Unmarshal(noPrefixLine, &response)
if unmarshalErr != nil {
return nil, unmarshalErr
}
return &response, nil
}
}
func (stream *streamReader) unmarshalError() (errResp *ErrorResponse) {
errBytes := stream.errAccumulator.Bytes()
if len(errBytes) == 0 {
return
}
err := stream.unmarshaler.Unmarshal(errBytes, &errResp)
if err != nil {
errResp = nil
}
return
}
func (stream *streamReader) Close() {
stream.response.Body.Close()
}
types.go
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package openrouter
const (
GooglePalm2CodeChatBison = "google/palm-2-codechat-bison"
GooglePalm2ChatBison = "google/palm-2-chat-bison"
OpenaiGpt35Turbo = "openai/gpt-3.5-turbo"
OpenaiGpt35Turbo16k = "openai/gpt-3.5-turbo-16k"
OpenaiGpt4 = "openai/gpt-4"
OpenaiGpt432K = "openai/gpt-4-32k"
AnthropicClaude2 = "anthropic/claude-2"
AnthropicClaudeInstantV1 = "anthropic/claude-instant-v1"
MetaLlamaLlama213bChat = "meta-llama/llama-2-13b-chat"
MetaLlamaLlama270bChat = "meta-llama/llama-2-70b-chat"
Palm2CodeChatBison = "palm-2-codechat-bison"
Palm2ChatBison = "palm-2-chat-bison"
Gpt35Turbo = "gpt-3.5-turbo"
Gpt35Turbo16k = "gpt-3.5-turbo-16k"
Gpt4 = "gpt-4"
G432K = "gpt-4-32k"
Claude2 = "claude-2"
ClaudeInstantV1 = "claude-instant-v1"
Llama213bChat = "llama-2-13b-chat"
Llama270bChat = "llama-2-70b-chat"
)
var (
enableModels = map[string]bool{
GooglePalm2CodeChatBison: true,
GooglePalm2ChatBison: true,
OpenaiGpt35Turbo: true,
OpenaiGpt35Turbo16k: true,
OpenaiGpt4: true,
OpenaiGpt432K: true,
AnthropicClaude2: true,
AnthropicClaudeInstantV1: true,
MetaLlamaLlama213bChat: true,
MetaLlamaLlama270bChat: true,
}
wrapperModels = map[string]string{
Palm2CodeChatBison: GooglePalm2CodeChatBison,
Palm2ChatBison: GooglePalm2ChatBison,
Gpt35Turbo: OpenaiGpt35Turbo,
Gpt35Turbo16k: OpenaiGpt35Turbo16k,
Gpt4: OpenaiGpt4,
G432K: OpenaiGpt432K,
Claude2: AnthropicClaude2,
ClaudeInstantV1: AnthropicClaudeInstantV1,
Llama213bChat: MetaLlamaLlama213bChat,
Llama270bChat: MetaLlamaLlama270bChat,
}
)
func checkSupportsModel(model string) bool {
return enableModels[model]
}
type ChatCompletionMessage struct {
Role string `json:"role"`
Content string `json:"content"`
}
// ChatCompletionRequest represents a request structure for chat completion API.
type ChatCompletionRequest struct {
Model string `json:"model"`
Messages []ChatCompletionMessage `json:"messages"`
MaxTokens int `json:"max_tokens,omitempty"`
Stream bool `json:"stream,omitempty"`
Temperature *float32 `json:"temperature,omitempty"`
TopP *float32 `json:"top_p,omitempty"`
TopK *uint `json:"top_k,omitempty"`
}
type Index struct {
Role string `json:"role"`
Content string `json:"content"`
}
type ChatCompletionChoice struct {
Message Index `json:"message,omitempty"`
FinishReason string `json:"finish_reason,omitempty"`
Delta Index `json:"delta,omitempty"`
Index uint `json:"index,omitempty"`
}
// ChatCompletionResponse represents a response structure for chat completion API.
type ChatCompletionResponse struct {
ID string `json:"id,omitempty"`
Object string `json:"object,omitempty"`
Created int64 `json:"created,omitempty"`
Model string `json:"model"`
Choices []ChatCompletionChoice `json:"choices"`
//Usage Usage `json:"usage,omitempty"`
}
type Usage struct {
CompletionTokens int `json:"completion_tokens"`
TotalTokens int `json:"total_tokens"`
}