1package provider
2
3import (
4 "context"
5 "encoding/json"
6 "errors"
7 "fmt"
8 "io"
9 "time"
10
11 "github.com/openai/openai-go"
12 "github.com/openai/openai-go/option"
13 "github.com/openai/openai-go/shared"
14 "github.com/opencode-ai/opencode/internal/config"
15 "github.com/opencode-ai/opencode/internal/llm/tools"
16 "github.com/opencode-ai/opencode/internal/logging"
17 "github.com/opencode-ai/opencode/internal/message"
18)
19
20type openaiOptions struct {
21 baseURL string
22 disableCache bool
23 reasoningEffort string
24 extraHeaders map[string]string
25}
26
27type OpenAIOption func(*openaiOptions)
28
29type openaiClient struct {
30 providerOptions providerClientOptions
31 options openaiOptions
32 client openai.Client
33}
34
35type OpenAIClient ProviderClient
36
37func newOpenAIClient(opts providerClientOptions) OpenAIClient {
38 openaiOpts := openaiOptions{
39 reasoningEffort: "medium",
40 }
41 for _, o := range opts.openaiOptions {
42 o(&openaiOpts)
43 }
44
45 openaiClientOptions := []option.RequestOption{}
46 if opts.apiKey != "" {
47 openaiClientOptions = append(openaiClientOptions, option.WithAPIKey(opts.apiKey))
48 }
49 if openaiOpts.baseURL != "" {
50 openaiClientOptions = append(openaiClientOptions, option.WithBaseURL(openaiOpts.baseURL))
51 }
52
53 if openaiOpts.extraHeaders != nil {
54 for key, value := range openaiOpts.extraHeaders {
55 openaiClientOptions = append(openaiClientOptions, option.WithHeader(key, value))
56 }
57 }
58
59 client := openai.NewClient(openaiClientOptions...)
60 return &openaiClient{
61 providerOptions: opts,
62 options: openaiOpts,
63 client: client,
64 }
65}
66
67func (o *openaiClient) convertMessages(messages []message.Message) (openaiMessages []openai.ChatCompletionMessageParamUnion) {
68 // Add system message first
69 openaiMessages = append(openaiMessages, openai.SystemMessage(o.providerOptions.systemMessage))
70
71 for _, msg := range messages {
72 switch msg.Role {
73 case message.User:
74 openaiMessages = append(openaiMessages, openai.UserMessage(msg.Content().String()))
75
76 case message.Assistant:
77 assistantMsg := openai.ChatCompletionAssistantMessageParam{
78 Role: "assistant",
79 }
80
81 if msg.Content().String() != "" {
82 assistantMsg.Content = openai.ChatCompletionAssistantMessageParamContentUnion{
83 OfString: openai.String(msg.Content().String()),
84 }
85 }
86
87 if len(msg.ToolCalls()) > 0 {
88 assistantMsg.ToolCalls = make([]openai.ChatCompletionMessageToolCallParam, len(msg.ToolCalls()))
89 for i, call := range msg.ToolCalls() {
90 assistantMsg.ToolCalls[i] = openai.ChatCompletionMessageToolCallParam{
91 ID: call.ID,
92 Type: "function",
93 Function: openai.ChatCompletionMessageToolCallFunctionParam{
94 Name: call.Name,
95 Arguments: call.Input,
96 },
97 }
98 }
99 }
100
101 openaiMessages = append(openaiMessages, openai.ChatCompletionMessageParamUnion{
102 OfAssistant: &assistantMsg,
103 })
104
105 case message.Tool:
106 for _, result := range msg.ToolResults() {
107 openaiMessages = append(openaiMessages,
108 openai.ToolMessage(result.Content, result.ToolCallID),
109 )
110 }
111 }
112 }
113
114 return
115}
116
117func (o *openaiClient) convertTools(tools []tools.BaseTool) []openai.ChatCompletionToolParam {
118 openaiTools := make([]openai.ChatCompletionToolParam, len(tools))
119
120 for i, tool := range tools {
121 info := tool.Info()
122 openaiTools[i] = openai.ChatCompletionToolParam{
123 Function: openai.FunctionDefinitionParam{
124 Name: info.Name,
125 Description: openai.String(info.Description),
126 Parameters: openai.FunctionParameters{
127 "type": "object",
128 "properties": info.Parameters,
129 "required": info.Required,
130 },
131 },
132 }
133 }
134
135 return openaiTools
136}
137
138func (o *openaiClient) finishReason(reason string) message.FinishReason {
139 switch reason {
140 case "stop":
141 return message.FinishReasonEndTurn
142 case "length":
143 return message.FinishReasonMaxTokens
144 case "tool_calls":
145 return message.FinishReasonToolUse
146 default:
147 return message.FinishReasonUnknown
148 }
149}
150
151func (o *openaiClient) preparedParams(messages []openai.ChatCompletionMessageParamUnion, tools []openai.ChatCompletionToolParam) openai.ChatCompletionNewParams {
152 params := openai.ChatCompletionNewParams{
153 Model: openai.ChatModel(o.providerOptions.model.APIModel),
154 Messages: messages,
155 Tools: tools,
156 }
157
158 if o.providerOptions.model.CanReason == true {
159 params.MaxCompletionTokens = openai.Int(o.providerOptions.maxTokens)
160 switch o.options.reasoningEffort {
161 case "low":
162 params.ReasoningEffort = shared.ReasoningEffortLow
163 case "medium":
164 params.ReasoningEffort = shared.ReasoningEffortMedium
165 case "high":
166 params.ReasoningEffort = shared.ReasoningEffortHigh
167 default:
168 params.ReasoningEffort = shared.ReasoningEffortMedium
169 }
170 } else {
171 params.MaxTokens = openai.Int(o.providerOptions.maxTokens)
172 }
173
174 return params
175}
176
177func (o *openaiClient) send(ctx context.Context, messages []message.Message, tools []tools.BaseTool) (response *ProviderResponse, err error) {
178 params := o.preparedParams(o.convertMessages(messages), o.convertTools(tools))
179 cfg := config.Get()
180 if cfg.Debug {
181 jsonData, _ := json.Marshal(params)
182 logging.Debug("Prepared messages", "messages", string(jsonData))
183 }
184 attempts := 0
185 for {
186 attempts++
187 openaiResponse, err := o.client.Chat.Completions.New(
188 ctx,
189 params,
190 )
191 // If there is an error we are going to see if we can retry the call
192 if err != nil {
193 retry, after, retryErr := o.shouldRetry(attempts, err)
194 if retryErr != nil {
195 return nil, retryErr
196 }
197 if retry {
198 logging.WarnPersist(fmt.Sprintf("Retrying due to rate limit... attempt %d of %d", attempts, maxRetries), logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
199 select {
200 case <-ctx.Done():
201 return nil, ctx.Err()
202 case <-time.After(time.Duration(after) * time.Millisecond):
203 continue
204 }
205 }
206 return nil, retryErr
207 }
208
209 content := ""
210 if openaiResponse.Choices[0].Message.Content != "" {
211 content = openaiResponse.Choices[0].Message.Content
212 }
213
214 toolCalls := o.toolCalls(*openaiResponse)
215 finishReason := o.finishReason(string(openaiResponse.Choices[0].FinishReason))
216
217 if len(toolCalls) > 0 {
218 finishReason = message.FinishReasonToolUse
219 }
220
221 return &ProviderResponse{
222 Content: content,
223 ToolCalls: toolCalls,
224 Usage: o.usage(*openaiResponse),
225 FinishReason: finishReason,
226 }, nil
227 }
228}
229
230func (o *openaiClient) stream(ctx context.Context, messages []message.Message, tools []tools.BaseTool) <-chan ProviderEvent {
231 params := o.preparedParams(o.convertMessages(messages), o.convertTools(tools))
232 params.StreamOptions = openai.ChatCompletionStreamOptionsParam{
233 IncludeUsage: openai.Bool(true),
234 }
235
236 cfg := config.Get()
237 if cfg.Debug {
238 jsonData, _ := json.Marshal(params)
239 logging.Debug("Prepared messages", "messages", string(jsonData))
240 }
241
242 attempts := 0
243 eventChan := make(chan ProviderEvent)
244
245 go func() {
246 for {
247 attempts++
248 openaiStream := o.client.Chat.Completions.NewStreaming(
249 ctx,
250 params,
251 )
252
253 acc := openai.ChatCompletionAccumulator{}
254 currentContent := ""
255 toolCalls := make([]message.ToolCall, 0)
256
257 for openaiStream.Next() {
258 chunk := openaiStream.Current()
259 acc.AddChunk(chunk)
260
261 for _, choice := range chunk.Choices {
262 if choice.Delta.Content != "" {
263 eventChan <- ProviderEvent{
264 Type: EventContentDelta,
265 Content: choice.Delta.Content,
266 }
267 currentContent += choice.Delta.Content
268 }
269 }
270 }
271
272 err := openaiStream.Err()
273 if err == nil || errors.Is(err, io.EOF) {
274 // Stream completed successfully
275 finishReason := o.finishReason(string(acc.ChatCompletion.Choices[0].FinishReason))
276 if len(acc.ChatCompletion.Choices[0].Message.ToolCalls) > 0 {
277 toolCalls = append(toolCalls, o.toolCalls(acc.ChatCompletion)...)
278 }
279 if len(toolCalls) > 0 {
280 finishReason = message.FinishReasonToolUse
281 }
282
283 eventChan <- ProviderEvent{
284 Type: EventComplete,
285 Response: &ProviderResponse{
286 Content: currentContent,
287 ToolCalls: toolCalls,
288 Usage: o.usage(acc.ChatCompletion),
289 FinishReason: finishReason,
290 },
291 }
292 close(eventChan)
293 return
294 }
295
296 // If there is an error we are going to see if we can retry the call
297 retry, after, retryErr := o.shouldRetry(attempts, err)
298 if retryErr != nil {
299 eventChan <- ProviderEvent{Type: EventError, Error: retryErr}
300 close(eventChan)
301 return
302 }
303 if retry {
304 logging.WarnPersist(fmt.Sprintf("Retrying due to rate limit... attempt %d of %d", attempts, maxRetries), logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
305 select {
306 case <-ctx.Done():
307 // context cancelled
308 if ctx.Err() == nil {
309 eventChan <- ProviderEvent{Type: EventError, Error: ctx.Err()}
310 }
311 close(eventChan)
312 return
313 case <-time.After(time.Duration(after) * time.Millisecond):
314 continue
315 }
316 }
317 eventChan <- ProviderEvent{Type: EventError, Error: retryErr}
318 close(eventChan)
319 return
320 }
321 }()
322
323 return eventChan
324}
325
326func (o *openaiClient) shouldRetry(attempts int, err error) (bool, int64, error) {
327 var apierr *openai.Error
328 if !errors.As(err, &apierr) {
329 return false, 0, err
330 }
331
332 if apierr.StatusCode != 429 && apierr.StatusCode != 500 {
333 return false, 0, err
334 }
335
336 if attempts > maxRetries {
337 return false, 0, fmt.Errorf("maximum retry attempts reached for rate limit: %d retries", maxRetries)
338 }
339
340 retryMs := 0
341 retryAfterValues := apierr.Response.Header.Values("Retry-After")
342
343 backoffMs := 2000 * (1 << (attempts - 1))
344 jitterMs := int(float64(backoffMs) * 0.2)
345 retryMs = backoffMs + jitterMs
346 if len(retryAfterValues) > 0 {
347 if _, err := fmt.Sscanf(retryAfterValues[0], "%d", &retryMs); err == nil {
348 retryMs = retryMs * 1000
349 }
350 }
351 return true, int64(retryMs), nil
352}
353
354func (o *openaiClient) toolCalls(completion openai.ChatCompletion) []message.ToolCall {
355 var toolCalls []message.ToolCall
356
357 if len(completion.Choices) > 0 && len(completion.Choices[0].Message.ToolCalls) > 0 {
358 for _, call := range completion.Choices[0].Message.ToolCalls {
359 toolCall := message.ToolCall{
360 ID: call.ID,
361 Name: call.Function.Name,
362 Input: call.Function.Arguments,
363 Type: "function",
364 Finished: true,
365 }
366 toolCalls = append(toolCalls, toolCall)
367 }
368 }
369
370 return toolCalls
371}
372
373func (o *openaiClient) usage(completion openai.ChatCompletion) TokenUsage {
374 cachedTokens := completion.Usage.PromptTokensDetails.CachedTokens
375 inputTokens := completion.Usage.PromptTokens - cachedTokens
376
377 return TokenUsage{
378 InputTokens: inputTokens,
379 OutputTokens: completion.Usage.CompletionTokens,
380 CacheCreationTokens: 0, // OpenAI doesn't provide this directly
381 CacheReadTokens: cachedTokens,
382 }
383}
384
385func WithOpenAIBaseURL(baseURL string) OpenAIOption {
386 return func(options *openaiOptions) {
387 options.baseURL = baseURL
388 }
389}
390
391func WithOpenAIExtraHeaders(headers map[string]string) OpenAIOption {
392 return func(options *openaiOptions) {
393 options.extraHeaders = headers
394 }
395}
396
397func WithOpenAIDisableCache() OpenAIOption {
398 return func(options *openaiOptions) {
399 options.disableCache = true
400 }
401}
402
403func WithReasoningEffort(effort string) OpenAIOption {
404 return func(options *openaiOptions) {
405 defaultReasoningEffort := "medium"
406 switch effort {
407 case "low", "medium", "high":
408 defaultReasoningEffort = effort
409 default:
410 logging.Warn("Invalid reasoning effort, using default: medium")
411 }
412 options.reasoningEffort = defaultReasoningEffort
413 }
414}