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114 lines
3.7 KiB
Go
114 lines
3.7 KiB
Go
package provider
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import (
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"encoding/json"
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"errors"
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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/types"
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"net/http"
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"strings"
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)
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const (
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cohereDomain = "api.cohere.com"
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cohereChatCompletionPath = "/v1/chat"
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)
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type cohereProviderInitializer struct{}
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func (m *cohereProviderInitializer) ValidateConfig(config ProviderConfig) error {
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if config.apiTokens == nil || len(config.apiTokens) == 0 {
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return errors.New("no apiToken found in provider config")
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}
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return nil
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}
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func (m *cohereProviderInitializer) CreateProvider(config ProviderConfig) (Provider, error) {
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return &cohereProvider{
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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 cohereProvider struct {
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config ProviderConfig
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contextCache *contextCache
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}
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type cohereTextGenRequest struct {
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Message string `json:"message,omitempty"`
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Model string `json:"model,omitempty"`
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Stream bool `json:"stream,omitempty"`
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MaxTokens int `json:"max_tokens,omitempty"`
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Temperature float64 `json:"temperature,omitempty"`
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K int `json:"k,omitempty"`
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P float64 `json:"p,omitempty"`
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Seed int `json:"seed,omitempty"`
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StopSequences []string `json:"stop_sequences,omitempty"`
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FrequencyPenalty float64 `json:"frequency_penalty,omitempty"`
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PresencePenalty float64 `json:"presence_penalty,omitempty"`
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}
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func (m *cohereProvider) GetProviderType() string {
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return providerTypeCohere
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}
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func (m *cohereProvider) 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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m.config.handleRequestHeaders(m, ctx, apiName, log)
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return types.ActionContinue, nil
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}
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func (m *cohereProvider) 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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return m.config.handleRequestBody(m, m.contextCache, ctx, apiName, body, log)
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}
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func (m *cohereProvider) buildCohereRequest(origin *chatCompletionRequest) *cohereTextGenRequest {
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if len(origin.Messages) == 0 {
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return nil
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}
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return &cohereTextGenRequest{
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Message: origin.Messages[0].StringContent(),
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Model: origin.Model,
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MaxTokens: origin.MaxTokens,
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Stream: origin.Stream,
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Temperature: origin.Temperature,
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K: origin.N,
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P: origin.TopP,
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Seed: origin.Seed,
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StopSequences: origin.Stop,
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FrequencyPenalty: origin.FrequencyPenalty,
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PresencePenalty: origin.PresencePenalty,
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}
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}
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func (m *cohereProvider) TransformRequestHeaders(ctx wrapper.HttpContext, apiName ApiName, headers http.Header, log wrapper.Log) {
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util.OverwriteRequestPathHeader(headers, cohereChatCompletionPath)
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util.OverwriteRequestHostHeader(headers, cohereDomain)
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util.OverwriteRequestAuthorizationHeader(headers, "Bearer "+m.config.GetApiTokenInUse(ctx))
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headers.Del("Content-Length")
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}
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func (m *cohereProvider) TransformRequestBody(ctx wrapper.HttpContext, apiName ApiName, body []byte, log wrapper.Log) ([]byte, error) {
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request := &chatCompletionRequest{}
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if err := m.config.parseRequestAndMapModel(ctx, request, body, log); err != nil {
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return nil, err
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}
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cohereRequest := m.buildCohereRequest(request)
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return json.Marshal(cohereRequest)
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}
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func (m *cohereProvider) GetApiName(path string) ApiName {
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if strings.Contains(path, cohereChatCompletionPath) {
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return ApiNameChatCompletion
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}
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return ""
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}
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