2024-02-07 22:24:29 +00:00
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// openai package provides middleware for partial compatibility with the OpenAI REST API
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package openai
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"math/rand"
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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2024-03-26 20:04:17 +00:00
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"github.com/ollama/ollama/api"
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2024-07-02 18:50:56 +00:00
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"github.com/ollama/ollama/types/model"
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2024-02-07 22:24:29 +00:00
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)
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type Error struct {
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Message string `json:"message"`
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Type string `json:"type"`
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Param interface{} `json:"param"`
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Code *string `json:"code"`
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}
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type ErrorResponse struct {
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Error Error `json:"error"`
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}
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type Message struct {
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Role string `json:"role"`
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Content string `json:"content"`
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}
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type Choice struct {
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Index int `json:"index"`
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Message Message `json:"message"`
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FinishReason *string `json:"finish_reason"`
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}
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type ChunkChoice struct {
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Index int `json:"index"`
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Delta Message `json:"delta"`
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FinishReason *string `json:"finish_reason"`
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}
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2024-07-02 23:01:45 +00:00
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type CompleteChunkChoice struct {
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Text string `json:"text"`
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Index int `json:"index"`
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FinishReason *string `json:"finish_reason"`
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}
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2024-02-07 22:24:29 +00:00
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type Usage struct {
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PromptTokens int `json:"prompt_tokens"`
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CompletionTokens int `json:"completion_tokens"`
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TotalTokens int `json:"total_tokens"`
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}
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type ResponseFormat struct {
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Type string `json:"type"`
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}
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type ChatCompletionRequest struct {
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Model string `json:"model"`
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Messages []Message `json:"messages"`
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Stream bool `json:"stream"`
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MaxTokens *int `json:"max_tokens"`
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Seed *int `json:"seed"`
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Stop any `json:"stop"`
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Temperature *float64 `json:"temperature"`
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FrequencyPenalty *float64 `json:"frequency_penalty"`
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PresencePenalty *float64 `json:"presence_penalty_penalty"`
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TopP *float64 `json:"top_p"`
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ResponseFormat *ResponseFormat `json:"response_format"`
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}
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type ChatCompletion struct {
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Id string `json:"id"`
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Object string `json:"object"`
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Created int64 `json:"created"`
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Model string `json:"model"`
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SystemFingerprint string `json:"system_fingerprint"`
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Choices []Choice `json:"choices"`
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Usage Usage `json:"usage,omitempty"`
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}
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type ChatCompletionChunk struct {
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Id string `json:"id"`
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Object string `json:"object"`
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Created int64 `json:"created"`
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Model string `json:"model"`
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SystemFingerprint string `json:"system_fingerprint"`
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Choices []ChunkChoice `json:"choices"`
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}
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2024-07-02 23:01:45 +00:00
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// TODO (https://github.com/ollama/ollama/issues/5259): support []string, []int and [][]int
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type CompletionRequest struct {
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Model string `json:"model"`
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Prompt string `json:"prompt"`
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FrequencyPenalty float32 `json:"frequency_penalty"`
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MaxTokens *int `json:"max_tokens"`
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PresencePenalty float32 `json:"presence_penalty"`
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Seed *int `json:"seed"`
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Stop any `json:"stop"`
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Stream bool `json:"stream"`
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Temperature *float32 `json:"temperature"`
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TopP float32 `json:"top_p"`
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}
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type Completion struct {
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Id string `json:"id"`
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Object string `json:"object"`
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Created int64 `json:"created"`
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Model string `json:"model"`
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SystemFingerprint string `json:"system_fingerprint"`
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Choices []CompleteChunkChoice `json:"choices"`
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Usage Usage `json:"usage,omitempty"`
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}
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type CompletionChunk struct {
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Id string `json:"id"`
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Object string `json:"object"`
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Created int64 `json:"created"`
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Choices []CompleteChunkChoice `json:"choices"`
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Model string `json:"model"`
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SystemFingerprint string `json:"system_fingerprint"`
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}
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2024-07-02 18:50:56 +00:00
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type Model struct {
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Id string `json:"id"`
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Object string `json:"object"`
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Created int64 `json:"created"`
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OwnedBy string `json:"owned_by"`
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}
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type ListCompletion struct {
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Object string `json:"object"`
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Data []Model `json:"data"`
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}
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2024-02-07 22:24:29 +00:00
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func NewError(code int, message string) ErrorResponse {
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var etype string
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switch code {
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case http.StatusBadRequest:
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etype = "invalid_request_error"
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case http.StatusNotFound:
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etype = "not_found_error"
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default:
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etype = "api_error"
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}
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return ErrorResponse{Error{Type: etype, Message: message}}
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}
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func toChatCompletion(id string, r api.ChatResponse) ChatCompletion {
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return ChatCompletion{
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Id: id,
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Object: "chat.completion",
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Created: r.CreatedAt.Unix(),
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Model: r.Model,
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SystemFingerprint: "fp_ollama",
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Choices: []Choice{{
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Index: 0,
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Message: Message{Role: r.Message.Role, Content: r.Message.Content},
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FinishReason: func(reason string) *string {
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if len(reason) > 0 {
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return &reason
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}
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return nil
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}(r.DoneReason),
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}},
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Usage: Usage{
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// TODO: ollama returns 0 for prompt eval if the prompt was cached, but openai returns the actual count
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PromptTokens: r.PromptEvalCount,
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CompletionTokens: r.EvalCount,
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TotalTokens: r.PromptEvalCount + r.EvalCount,
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},
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}
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}
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func toChunk(id string, r api.ChatResponse) ChatCompletionChunk {
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return ChatCompletionChunk{
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Id: id,
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Object: "chat.completion.chunk",
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Created: time.Now().Unix(),
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Model: r.Model,
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SystemFingerprint: "fp_ollama",
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2024-05-11 22:31:41 +00:00
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Choices: []ChunkChoice{{
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Index: 0,
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Delta: Message{Role: "assistant", Content: r.Message.Content},
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FinishReason: func(reason string) *string {
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if len(reason) > 0 {
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return &reason
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}
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return nil
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}(r.DoneReason),
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}},
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}
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}
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2024-07-02 23:01:45 +00:00
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func toCompletion(id string, r api.GenerateResponse) Completion {
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return Completion{
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Id: id,
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Object: "text_completion",
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Created: r.CreatedAt.Unix(),
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Model: r.Model,
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SystemFingerprint: "fp_ollama",
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Choices: []CompleteChunkChoice{{
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Text: r.Response,
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Index: 0,
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FinishReason: func(reason string) *string {
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if len(reason) > 0 {
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return &reason
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}
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return nil
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}(r.DoneReason),
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}},
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Usage: Usage{
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// TODO: ollama returns 0 for prompt eval if the prompt was cached, but openai returns the actual count
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PromptTokens: r.PromptEvalCount,
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CompletionTokens: r.EvalCount,
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TotalTokens: r.PromptEvalCount + r.EvalCount,
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},
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}
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}
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func toCompleteChunk(id string, r api.GenerateResponse) CompletionChunk {
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return CompletionChunk{
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Id: id,
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Object: "text_completion",
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Created: time.Now().Unix(),
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Model: r.Model,
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SystemFingerprint: "fp_ollama",
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Choices: []CompleteChunkChoice{{
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Text: r.Response,
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Index: 0,
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FinishReason: func(reason string) *string {
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if len(reason) > 0 {
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return &reason
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}
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return nil
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}(r.DoneReason),
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}},
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}
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}
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2024-07-02 18:50:56 +00:00
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func toListCompletion(r api.ListResponse) ListCompletion {
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var data []Model
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for _, m := range r.Models {
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data = append(data, Model{
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Id: m.Name,
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Object: "model",
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Created: m.ModifiedAt.Unix(),
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OwnedBy: model.ParseName(m.Name).Namespace,
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})
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}
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return ListCompletion{
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Object: "list",
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Data: data,
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}
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}
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func toModel(r api.ShowResponse, m string) Model {
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return Model{
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Id: m,
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Object: "model",
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Created: r.ModifiedAt.Unix(),
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OwnedBy: model.ParseName(m).Namespace,
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}
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}
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func fromChatRequest(r ChatCompletionRequest) api.ChatRequest {
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var messages []api.Message
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for _, msg := range r.Messages {
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messages = append(messages, api.Message{Role: msg.Role, Content: msg.Content})
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}
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options := make(map[string]interface{})
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switch stop := r.Stop.(type) {
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case string:
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options["stop"] = []string{stop}
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case []any:
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var stops []string
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for _, s := range stop {
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if str, ok := s.(string); ok {
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stops = append(stops, str)
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}
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}
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options["stop"] = stops
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}
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if r.MaxTokens != nil {
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options["num_predict"] = *r.MaxTokens
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}
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if r.Temperature != nil {
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options["temperature"] = *r.Temperature * 2.0
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} else {
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options["temperature"] = 1.0
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}
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if r.Seed != nil {
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options["seed"] = *r.Seed
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}
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if r.FrequencyPenalty != nil {
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options["frequency_penalty"] = *r.FrequencyPenalty * 2.0
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}
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if r.PresencePenalty != nil {
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options["presence_penalty"] = *r.PresencePenalty * 2.0
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}
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if r.TopP != nil {
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options["top_p"] = *r.TopP
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} else {
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options["top_p"] = 1.0
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}
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var format string
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if r.ResponseFormat != nil && r.ResponseFormat.Type == "json_object" {
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format = "json"
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}
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return api.ChatRequest{
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Model: r.Model,
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Messages: messages,
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Format: format,
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Options: options,
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Stream: &r.Stream,
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}
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}
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func fromCompleteRequest(r CompletionRequest) (api.GenerateRequest, error) {
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options := make(map[string]any)
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switch stop := r.Stop.(type) {
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case string:
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options["stop"] = []string{stop}
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case []string:
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options["stop"] = stop
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default:
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if r.Stop != nil {
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return api.GenerateRequest{}, fmt.Errorf("invalid type for 'stop' field: %T", r.Stop)
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}
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}
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if r.MaxTokens != nil {
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options["num_predict"] = *r.MaxTokens
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}
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if r.Temperature != nil {
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options["temperature"] = *r.Temperature * 2.0
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} else {
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options["temperature"] = 1.0
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}
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if r.Seed != nil {
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options["seed"] = *r.Seed
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}
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options["frequency_penalty"] = r.FrequencyPenalty * 2.0
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options["presence_penalty"] = r.PresencePenalty * 2.0
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if r.TopP != 0.0 {
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options["top_p"] = r.TopP
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} else {
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options["top_p"] = 1.0
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}
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return api.GenerateRequest{
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Model: r.Model,
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Prompt: r.Prompt,
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Options: options,
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Stream: &r.Stream,
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}, nil
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}
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type BaseWriter struct {
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gin.ResponseWriter
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}
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type ChatWriter struct {
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stream bool
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id string
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BaseWriter
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}
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type CompleteWriter struct {
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stream bool
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id string
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BaseWriter
|
|
|
|
}
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
type ListWriter struct {
|
|
|
|
BaseWriter
|
|
|
|
}
|
|
|
|
|
|
|
|
type RetrieveWriter struct {
|
|
|
|
BaseWriter
|
|
|
|
model string
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *BaseWriter) writeError(code int, data []byte) (int, error) {
|
2024-02-07 22:24:29 +00:00
|
|
|
var serr api.StatusError
|
|
|
|
err := json.Unmarshal(data, &serr)
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "application/json")
|
|
|
|
err = json.NewEncoder(w.ResponseWriter).Encode(NewError(http.StatusInternalServerError, serr.Error()))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
func (w *ChatWriter) writeResponse(data []byte) (int, error) {
|
2024-02-07 22:24:29 +00:00
|
|
|
var chatResponse api.ChatResponse
|
|
|
|
err := json.Unmarshal(data, &chatResponse)
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
// chat chunk
|
|
|
|
if w.stream {
|
|
|
|
d, err := json.Marshal(toChunk(w.id, chatResponse))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "text/event-stream")
|
|
|
|
_, err = w.ResponseWriter.Write([]byte(fmt.Sprintf("data: %s\n\n", d)))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
if chatResponse.Done {
|
|
|
|
_, err = w.ResponseWriter.Write([]byte("data: [DONE]\n\n"))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// chat completion
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "application/json")
|
|
|
|
err = json.NewEncoder(w.ResponseWriter).Encode(toChatCompletion(w.id, chatResponse))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
func (w *ChatWriter) Write(data []byte) (int, error) {
|
2024-02-07 22:24:29 +00:00
|
|
|
code := w.ResponseWriter.Status()
|
|
|
|
if code != http.StatusOK {
|
|
|
|
return w.writeError(code, data)
|
|
|
|
}
|
|
|
|
|
|
|
|
return w.writeResponse(data)
|
|
|
|
}
|
|
|
|
|
2024-07-02 23:01:45 +00:00
|
|
|
func (w *CompleteWriter) writeResponse(data []byte) (int, error) {
|
|
|
|
var generateResponse api.GenerateResponse
|
|
|
|
err := json.Unmarshal(data, &generateResponse)
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
// completion chunk
|
|
|
|
if w.stream {
|
|
|
|
d, err := json.Marshal(toCompleteChunk(w.id, generateResponse))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "text/event-stream")
|
|
|
|
_, err = w.ResponseWriter.Write([]byte(fmt.Sprintf("data: %s\n\n", d)))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
if generateResponse.Done {
|
|
|
|
_, err = w.ResponseWriter.Write([]byte("data: [DONE]\n\n"))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// completion
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "application/json")
|
|
|
|
err = json.NewEncoder(w.ResponseWriter).Encode(toCompletion(w.id, generateResponse))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *CompleteWriter) Write(data []byte) (int, error) {
|
|
|
|
code := w.ResponseWriter.Status()
|
|
|
|
if code != http.StatusOK {
|
|
|
|
return w.writeError(code, data)
|
|
|
|
}
|
|
|
|
|
|
|
|
return w.writeResponse(data)
|
|
|
|
}
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
func (w *ListWriter) writeResponse(data []byte) (int, error) {
|
|
|
|
var listResponse api.ListResponse
|
|
|
|
err := json.Unmarshal(data, &listResponse)
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "application/json")
|
|
|
|
err = json.NewEncoder(w.ResponseWriter).Encode(toListCompletion(listResponse))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *ListWriter) Write(data []byte) (int, error) {
|
|
|
|
code := w.ResponseWriter.Status()
|
|
|
|
if code != http.StatusOK {
|
|
|
|
return w.writeError(code, data)
|
|
|
|
}
|
|
|
|
|
|
|
|
return w.writeResponse(data)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *RetrieveWriter) writeResponse(data []byte) (int, error) {
|
|
|
|
var showResponse api.ShowResponse
|
|
|
|
err := json.Unmarshal(data, &showResponse)
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
// retrieve completion
|
|
|
|
w.ResponseWriter.Header().Set("Content-Type", "application/json")
|
|
|
|
err = json.NewEncoder(w.ResponseWriter).Encode(toModel(showResponse, w.model))
|
|
|
|
if err != nil {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return len(data), nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *RetrieveWriter) Write(data []byte) (int, error) {
|
|
|
|
code := w.ResponseWriter.Status()
|
|
|
|
if code != http.StatusOK {
|
|
|
|
return w.writeError(code, data)
|
|
|
|
}
|
|
|
|
|
|
|
|
return w.writeResponse(data)
|
|
|
|
}
|
|
|
|
|
|
|
|
func ListMiddleware() gin.HandlerFunc {
|
|
|
|
return func(c *gin.Context) {
|
|
|
|
w := &ListWriter{
|
|
|
|
BaseWriter: BaseWriter{ResponseWriter: c.Writer},
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Writer = w
|
|
|
|
|
|
|
|
c.Next()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func RetrieveMiddleware() gin.HandlerFunc {
|
|
|
|
return func(c *gin.Context) {
|
|
|
|
var b bytes.Buffer
|
|
|
|
if err := json.NewEncoder(&b).Encode(api.ShowRequest{Name: c.Param("model")}); err != nil {
|
|
|
|
c.AbortWithStatusJSON(http.StatusInternalServerError, NewError(http.StatusInternalServerError, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Request.Body = io.NopCloser(&b)
|
|
|
|
|
|
|
|
// response writer
|
|
|
|
w := &RetrieveWriter{
|
|
|
|
BaseWriter: BaseWriter{ResponseWriter: c.Writer},
|
|
|
|
model: c.Param("model"),
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Writer = w
|
|
|
|
|
|
|
|
c.Next()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2024-07-02 23:01:45 +00:00
|
|
|
func CompletionsMiddleware() gin.HandlerFunc {
|
|
|
|
return func(c *gin.Context) {
|
|
|
|
var req CompletionRequest
|
|
|
|
err := c.ShouldBindJSON(&req)
|
|
|
|
if err != nil {
|
|
|
|
c.AbortWithStatusJSON(http.StatusBadRequest, NewError(http.StatusBadRequest, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
var b bytes.Buffer
|
|
|
|
genReq, err := fromCompleteRequest(req)
|
|
|
|
if err != nil {
|
|
|
|
c.AbortWithStatusJSON(http.StatusBadRequest, NewError(http.StatusBadRequest, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
if err := json.NewEncoder(&b).Encode(genReq); err != nil {
|
|
|
|
c.AbortWithStatusJSON(http.StatusInternalServerError, NewError(http.StatusInternalServerError, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Request.Body = io.NopCloser(&b)
|
|
|
|
|
|
|
|
w := &CompleteWriter{
|
|
|
|
BaseWriter: BaseWriter{ResponseWriter: c.Writer},
|
|
|
|
stream: req.Stream,
|
|
|
|
id: fmt.Sprintf("cmpl-%d", rand.Intn(999)),
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Writer = w
|
|
|
|
|
|
|
|
c.Next()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
func ChatMiddleware() gin.HandlerFunc {
|
2024-02-07 22:24:29 +00:00
|
|
|
return func(c *gin.Context) {
|
|
|
|
var req ChatCompletionRequest
|
|
|
|
err := c.ShouldBindJSON(&req)
|
|
|
|
if err != nil {
|
|
|
|
c.AbortWithStatusJSON(http.StatusBadRequest, NewError(http.StatusBadRequest, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(req.Messages) == 0 {
|
|
|
|
c.AbortWithStatusJSON(http.StatusBadRequest, NewError(http.StatusBadRequest, "[] is too short - 'messages'"))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
var b bytes.Buffer
|
2024-07-02 18:50:56 +00:00
|
|
|
if err := json.NewEncoder(&b).Encode(fromChatRequest(req)); err != nil {
|
2024-02-07 22:24:29 +00:00
|
|
|
c.AbortWithStatusJSON(http.StatusInternalServerError, NewError(http.StatusInternalServerError, err.Error()))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Request.Body = io.NopCloser(&b)
|
|
|
|
|
2024-07-02 18:50:56 +00:00
|
|
|
w := &ChatWriter{
|
|
|
|
BaseWriter: BaseWriter{ResponseWriter: c.Writer},
|
|
|
|
stream: req.Stream,
|
|
|
|
id: fmt.Sprintf("chatcmpl-%d", rand.Intn(999)),
|
2024-02-07 22:24:29 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
c.Writer = w
|
|
|
|
|
|
|
|
c.Next()
|
|
|
|
}
|
|
|
|
}
|