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105 lines
3.3 KiB
Go
105 lines
3.3 KiB
Go
package provider
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import (
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"fmt"
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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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// openaiProvider is the provider for OpenAI service.
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const (
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openaiDomain = "api.openai.com"
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openaiChatCompletionPath = "/v1/chat/completions"
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openaiEmbeddingsPath = "/v1/chat/embeddings"
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)
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type openaiProviderInitializer struct {
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}
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func (m *openaiProviderInitializer) ValidateConfig(config ProviderConfig) error {
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return nil
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}
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func (m *openaiProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
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return &openaiProvider{
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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 openaiProvider struct {
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config ProviderConfig
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contextCache *contextCache
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}
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func (m *openaiProvider) GetProviderType() string {
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return providerTypeOpenAI
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}
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func (m *openaiProvider) OnRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, log wrapper.Log) (types.Action, error) {
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switch apiName {
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case ApiNameChatCompletion:
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_ = util.OverwriteRequestPath(openaiChatCompletionPath)
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break
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case ApiNameEmbeddings:
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_ = util.OverwriteRequestPath(openaiEmbeddingsPath)
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break
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}
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_ = util.OverwriteRequestAuthorization("Bearer " + m.config.GetRandomToken())
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_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
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return types.ActionContinue, nil
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}
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func (m *openaiProvider) 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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// We don't need to process the request body for other APIs.
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return types.ActionContinue, nil
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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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bodyAltered := false
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if request.Stream {
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// For stream requests, we need to include usage in the response.
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if request.StreamOptions == nil {
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request.StreamOptions = &streamOptions{IncludeUsage: true}
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bodyAltered = true
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} else if !request.StreamOptions.IncludeUsage {
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request.StreamOptions.IncludeUsage = true
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bodyAltered = true
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}
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}
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if m.contextCache == nil {
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if bodyAltered {
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if err := replaceJsonRequestBody(request, log); err != nil {
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_ = util.SendResponse(500, "ai-proxy.openai.set_include_usage_failed", util.MimeTypeTextPlain, fmt.Sprintf("failed to replace request body: %v", err))
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}
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}
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return types.ActionContinue, nil
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} else {
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// If context cache is configured and body has been altered, the new body will be replaced when inserting the context data.
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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, "ai-proxy.openai.load_ctx_failed", 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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if err := replaceJsonRequestBody(request, log); err != nil {
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_ = util.SendResponse(500, "ai-proxy.openai.insert_ctx_failed", 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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