mirror of
https://github.com/alibaba/higress.git
synced 2026-05-28 22:57:31 +08:00
458 lines
15 KiB
Go
458 lines
15 KiB
Go
package provider
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import (
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"encoding/json"
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"errors"
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"fmt"
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"math"
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"strings"
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"time"
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"github.com/alibaba/higress/plugins/wasm-go/extensions/ai-proxy/util"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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)
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// qwenProvider is the provider for Qwen service.
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const (
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qwenResultFormatMessage = "message"
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qwenDomain = "dashscope.aliyuncs.com"
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qwenChatCompletionPath = "/api/v1/services/aigc/text-generation/generation"
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qwenTopPMin = 0.000001
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qwenTopPMax = 0.999999
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)
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type qwenProviderInitializer struct {
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}
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func (m *qwenProviderInitializer) ValidateConfig(config ProviderConfig) error {
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return nil
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}
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func (m *qwenProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
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return &qwenProvider{
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config: config,
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contextCache: createContextCache(&config),
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}, nil
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}
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type qwenProvider struct {
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config ProviderConfig
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contextCache *contextCache
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}
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func (m *qwenProvider) GetProviderType() string {
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return providerTypeQwen
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}
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const (
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forceStreaming = true
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)
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func (m *qwenProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
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if apiName != ApiNameChatCompletion {
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return types.ActionContinue, errUnsupportedApiName
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}
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_ = util.OverwriteRequestPath(qwenChatCompletionPath)
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_ = util.OverwriteRequestHost(qwenDomain)
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_ = proxywasm.ReplaceHttpRequestHeader("Authorization", "Bearer "+m.config.GetRandomToken())
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if m.config.protocol == protocolOriginal && m.config.context == nil {
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ctx.DontReadRequestBody()
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return types.ActionContinue, nil
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}
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if forceStreaming {
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_ = proxywasm.RemoveHttpRequestHeader("Accept-Encoding")
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_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
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_ = proxywasm.ReplaceHttpRequestHeader("Accept", "text/event-stream")
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_ = proxywasm.ReplaceHttpRequestHeader("X-DashScope-SSE", "enable")
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return types.ActionContinue, nil
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} else {
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// Delay the header processing to allow changing streaming mode in OnRequestBody
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return types.HeaderStopIteration, nil
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}
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}
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func (m *qwenProvider) OnRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
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if apiName != ApiNameChatCompletion {
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return types.ActionContinue, errUnsupportedApiName
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}
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if m.config.protocol == protocolOriginal {
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if m.config.context == nil {
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return types.ActionContinue, nil
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}
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request := &qwenTextGenRequest{}
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if err := json.Unmarshal(body, request); err != nil {
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return types.ActionContinue, fmt.Errorf("unable to unmarshal request: %v", err)
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}
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err := m.contextCache.GetContent(func(content string, err error) {
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defer func() {
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_ = proxywasm.ResumeHttpRequest()
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}()
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if err != nil {
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log.Errorf("failed to load context file: %v", err)
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_ = util.SendResponse(500, util.MimeTypeTextPlain, fmt.Sprintf("failed to load context file: %v", err))
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}
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m.insertContextMessage(request, content)
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if err := replaceJsonRequestBody(request, log); err != nil {
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_ = util.SendResponse(500, util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
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}
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}, log)
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if err == nil {
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return types.ActionPause, nil
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}
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return types.ActionContinue, err
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}
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request := &chatCompletionRequest{}
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if err := decodeChatCompletionRequest(body, request); err != nil {
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return types.ActionContinue, err
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}
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model := request.Model
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if model == "" {
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return types.ActionContinue, errors.New("missing model in chat completion request")
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}
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ctx.SetContext(ctxKeyOriginalRequestModel, model)
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mappedModel := getMappedModel(model, m.config.modelMapping, log)
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if mappedModel == "" {
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return types.ActionContinue, errors.New("model becomes empty after applying the configured mapping")
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}
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request.Model = mappedModel
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ctx.SetContext(ctxKeyFinalRequestModel, request.Model)
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if !forceStreaming {
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if request.Stream {
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_ = proxywasm.ReplaceHttpRequestHeader("Accept", "text/event-stream")
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_ = proxywasm.ReplaceHttpRequestHeader("X-DashScope-SSE", "enable")
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} else {
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_ = proxywasm.ReplaceHttpRequestHeader("Accept", "*/*")
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_ = proxywasm.RemoveHttpRequestHeader("X-DashScope-SSE")
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}
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}
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if m.config.context == nil {
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qwenRequest := m.buildQwenTextGenerationRequest(request)
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return types.ActionContinue, replaceJsonRequestBody(qwenRequest, log)
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}
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err := m.contextCache.GetContent(func(content string, err error) {
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defer func() {
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_ = proxywasm.ResumeHttpRequest()
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}()
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if err != nil {
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log.Errorf("failed to load context file: %v", err)
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_ = util.SendResponse(500, util.MimeTypeTextPlain, fmt.Sprintf("failed to load context file: %v", err))
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}
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insertContextMessage(request, content)
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qwenRequest := m.buildQwenTextGenerationRequest(request)
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if err := replaceJsonRequestBody(qwenRequest, log); err != nil {
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_ = util.SendResponse(500, util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
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}
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}, log)
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if err == nil {
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return types.ActionPause, nil
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}
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return types.ActionContinue, err
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}
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func (m *qwenProvider) OnResponseHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
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if m.config.protocol == protocolOriginal {
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ctx.DontReadResponseBody()
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return types.ActionContinue, nil
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}
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_ = proxywasm.RemoveHttpResponseHeader("Content-Length")
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return types.ActionContinue, nil
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}
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func (m *qwenProvider) OnStreamingResponseBody(ctx wrapper.HttpContext, name ApiName, chunk []byte, isLastChunk bool, log wrapper.Log) ([]byte, error) {
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receivedBody := chunk
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if bufferedStreamingBody, has := ctx.GetContext(ctxKeyStreamingBody).([]byte); has {
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receivedBody = append(bufferedStreamingBody, chunk...)
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}
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eventStartIndex, lineStartIndex, valueStartIndex := -1, -1, -1
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defer func() {
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if eventStartIndex >= 0 && eventStartIndex < len(receivedBody) {
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// Just in case the received chunk is not a complete event.
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ctx.SetContext(ctxKeyStreamingBody, receivedBody[eventStartIndex:])
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} else {
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ctx.SetContext(ctxKeyStreamingBody, nil)
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}
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}()
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// Sample event response:
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//
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// event:result
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// :HTTP_STATUS/200
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// data:{"output":{"choices":[{"message":{"content":"你好！","role":"assistant"},"finish_reason":"null"}]},"usage":{"total_tokens":116,"input_tokens":114,"output_tokens":2},"request_id":"71689cfc-1f42-9949-86e8-9563b7f832b1"}
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//
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// event:error
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// :HTTP_STATUS/400
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// data:{"code":"InvalidParameter","message":"Preprocessor error","request_id":"0cbe6006-faec-9854-bf8b-c906d75c3bd8"}
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//
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var responseBuilder strings.Builder
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currentKey := ""
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currentEvent := &streamEvent{}
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i, length := 0, len(receivedBody)
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for i = 0; i < length; i++ {
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ch := receivedBody[i]
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if ch != '\n' {
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if lineStartIndex == -1 {
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if eventStartIndex == -1 {
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eventStartIndex = i
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}
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lineStartIndex = i
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valueStartIndex = -1
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}
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if valueStartIndex == -1 {
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if ch == ':' {
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valueStartIndex = i + 1
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currentKey = string(receivedBody[lineStartIndex:valueStartIndex])
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}
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} else if valueStartIndex == i && ch == ' ' {
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// Skip leading spaces in data.
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valueStartIndex = i + 1
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}
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continue
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}
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if lineStartIndex != -1 {
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value := string(receivedBody[valueStartIndex:i])
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log.Debugf("key: %s value: %s", currentKey, value)
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currentEvent.setValue(currentKey, value)
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} else {
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// Extra new line. The current event is complete.
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log.Debugf("processing event: %v", currentEvent)
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if err := m.convertStreamEvent(ctx, &responseBuilder, currentEvent, log); err != nil {
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return nil, err
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}
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// Reset event parsing state.
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eventStartIndex = -1
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currentEvent = &streamEvent{}
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}
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// Reset line parsing state.
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lineStartIndex = -1
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valueStartIndex = -1
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currentKey = ""
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}
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modifiedResponseChunk := responseBuilder.String()
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log.Debugf("=== modified response chunk: %s", modifiedResponseChunk)
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return []byte(modifiedResponseChunk), nil
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}
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func (m *qwenProvider) OnResponseBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) (types.Action, error) {
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qwenResponse := &qwenTextGenResponse{}
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if err := json.Unmarshal(body, qwenResponse); err != nil {
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return types.ActionContinue, fmt.Errorf("unable to unmarshal Qwen response: %v", err)
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}
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response := m.buildChatCompletionResponse(ctx, qwenResponse)
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return types.ActionContinue, replaceJsonResponseBody(response, log)
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}
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func (m *qwenProvider) buildQwenTextGenerationRequest(origRequest *chatCompletionRequest) *qwenTextGenRequest {
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return &qwenTextGenRequest{
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Model: origRequest.Model,
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Input: qwenTextGenInput{
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Messages: origRequest.Messages,
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},
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Parameters: qwenTextGenParameters{
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ResultFormat: qwenResultFormatMessage,
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MaxTokens: origRequest.MaxTokens,
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N: origRequest.N,
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Seed: origRequest.Seed,
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Temperature: origRequest.Temperature,
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TopP: math.Max(qwenTopPMin, math.Min(origRequest.TopP, qwenTopPMax)),
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},
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}
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}
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func (m *qwenProvider) buildChatCompletionResponse(ctx wrapper.HttpContext, qwenResponse *qwenTextGenResponse) *chatCompletionResponse {
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choices := make([]chatCompletionChoice, 0, len(qwenResponse.Output.Choices))
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for _, qwenChoice := range qwenResponse.Output.Choices {
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choices = append(choices, chatCompletionChoice{
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Message: &qwenChoice.Message,
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FinishReason: qwenChoice.FinishReason,
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})
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}
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return &chatCompletionResponse{
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Id: qwenResponse.RequestId,
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Created: time.Now().UnixMilli() / 1000,
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Model: ctx.GetContext(ctxKeyFinalRequestModel).(string),
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SystemFingerprint: "",
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Object: objectChatCompletion,
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Choices: choices,
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Usage: chatCompletionUsage{
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PromptTokens: qwenResponse.Usage.InputTokens,
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CompletionTokens: qwenResponse.Usage.OutputTokens,
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TotalTokens: qwenResponse.Usage.TotalTokens,
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},
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}
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}
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func (m *qwenProvider) buildChatCompletionStreamingResponse(ctx wrapper.HttpContext, qwenResponse *qwenTextGenResponse) []*chatCompletionResponse {
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baseMessage := chatCompletionResponse{
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Id: qwenResponse.RequestId,
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Created: time.Now().UnixMilli() / 1000,
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Model: ctx.GetContext(ctxKeyFinalRequestModel).(string),
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SystemFingerprint: "",
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Object: objectChatCompletionChunk,
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}
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responses := make([]*chatCompletionResponse, 0)
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qwenChoice := qwenResponse.Output.Choices[0]
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message := qwenChoice.Message
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content := message.Content
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if rawPushedContent := ctx.GetContext(ctxKeyPushedMessageContent); rawPushedContent != nil {
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if pushedContent := rawPushedContent.(string); pushedContent != "" && strings.HasPrefix(content, pushedContent) {
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content = content[len(pushedContent):]
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}
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}
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if content != "" {
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deltaResponse := *&baseMessage
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deltaResponse.Choices = append(deltaResponse.Choices, chatCompletionChoice{Delta: &chatMessage{Role: message.Role, Content: content}})
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responses = append(responses, &deltaResponse)
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ctx.SetContext(ctxKeyPushedMessageContent, message.Content)
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}
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// Yes, Qwen uses a string "null" as null.
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if qwenChoice.FinishReason != "" && qwenChoice.FinishReason != "null" {
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finishResponse := *&baseMessage
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finishResponse.Choices = append(finishResponse.Choices, chatCompletionChoice{FinishReason: qwenChoice.FinishReason})
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responses = append(responses, &finishResponse)
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}
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return responses
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}
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func (m *qwenProvider) convertStreamEvent(ctx wrapper.HttpContext, responseBuilder *strings.Builder, event *streamEvent, log wrapper.Log) error {
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if event.Data == streamEndDataValue {
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m.appendStreamEvent(responseBuilder, event)
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return nil
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}
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if event.Event != eventResult || event.HttpStatus != httpStatus200 {
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// Something goes wrong. Just pass through the event.
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m.appendStreamEvent(responseBuilder, event)
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return nil
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}
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qwenResponse := &qwenTextGenResponse{}
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if err := json.Unmarshal([]byte(event.Data), qwenResponse); err != nil {
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log.Errorf("unable to unmarshal Qwen response: %v", err)
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return fmt.Errorf("unable to unmarshal Qwen response: %v", err)
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}
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responses := m.buildChatCompletionStreamingResponse(ctx, qwenResponse)
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for _, response := range responses {
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responseBody, err := json.Marshal(response)
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if err != nil {
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log.Errorf("unable to marshal response: %v", err)
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return fmt.Errorf("unable to marshal response: %v", err)
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}
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modifiedEvent := &*event
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modifiedEvent.Data = string(responseBody)
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m.appendStreamEvent(responseBuilder, modifiedEvent)
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}
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return nil
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}
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func (m *qwenProvider) insertContextMessage(request *qwenTextGenRequest, content string) {
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fileMessage := chatMessage{
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Role: roleSystem,
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Content: content,
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}
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firstNonSystemMessageIndex := -1
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messages := request.Input.Messages
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if messages != nil {
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for i, message := range request.Input.Messages {
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if message.Role != roleSystem {
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firstNonSystemMessageIndex = i
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break
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}
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}
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}
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if firstNonSystemMessageIndex == -1 {
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request.Input.Messages = append(request.Input.Messages, fileMessage)
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} else {
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request.Input.Messages = append(request.Input.Messages[:firstNonSystemMessageIndex], append([]chatMessage{fileMessage}, request.Input.Messages[firstNonSystemMessageIndex:]...)...)
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}
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}
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func (m *qwenProvider) appendStreamEvent(responseBuilder *strings.Builder, event *streamEvent) {
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responseBuilder.WriteString(streamEventIdItemKey)
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responseBuilder.WriteString(event.Id)
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responseBuilder.WriteString("\n")
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responseBuilder.WriteString(streamEventNameItemKey)
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responseBuilder.WriteString(event.Event)
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responseBuilder.WriteString("\n")
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responseBuilder.WriteString(streamBuiltInItemKey)
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responseBuilder.WriteString(streamHttpStatusValuePrefix)
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responseBuilder.WriteString(event.HttpStatus)
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responseBuilder.WriteString("\n")
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responseBuilder.WriteString(streamDataItemKey)
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responseBuilder.WriteString(event.Data)
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responseBuilder.WriteString("\n\n")
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}
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type qwenTextGenRequest struct {
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Model string `json:"model"`
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Input qwenTextGenInput `json:"input"`
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Parameters qwenTextGenParameters `json:"parameters,omitempty"`
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}
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type qwenTextGenInput struct {
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Messages []chatMessage `json:"messages"`
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}
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type qwenTextGenParameters struct {
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ResultFormat string `json:"result_format,omitempty"`
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MaxTokens int `json:"max_tokens,omitempty"`
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RepetitionPenalty float64 `json:"repetition_penalty,omitempty"`
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N int `json:"n,omitempty"`
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Seed int `json:"seed,omitempty"`
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Temperature float64 `json:"temperature,omitempty"`
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TopP float64 `json:"top_p,omitempty"`
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}
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type qwenTextGenResponse struct {
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RequestId string `json:"request_id"`
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Output qwenTextGenOutput `json:"output"`
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Usage qwenTextGenUsage `json:"usage"`
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}
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type qwenTextGenOutput struct {
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FinishReason string `json:"finish_reason"`
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Choices []qwenTextGenChoice `json:"choices"`
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}
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type qwenTextGenChoice struct {
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FinishReason string `json:"finish_reason"`
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Message chatMessage `json:"message"`
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}
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type qwenTextGenUsage struct {
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InputTokens int `json:"input_tokens"`
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OutputTokens int `json:"output_tokens"`
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TotalTokens int `json:"total_tokens"`
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}
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