1package provider
2
3import (
4 "context"
5 "encoding/json"
6 "errors"
7 "fmt"
8 "io"
9 "strings"
10 "time"
11
12 "github.com/anthropics/anthropic-sdk-go"
13 "github.com/anthropics/anthropic-sdk-go/bedrock"
14 "github.com/anthropics/anthropic-sdk-go/option"
15 "github.com/opencode-ai/opencode/internal/config"
16 "github.com/opencode-ai/opencode/internal/llm/models"
17 "github.com/opencode-ai/opencode/internal/llm/tools"
18 "github.com/opencode-ai/opencode/internal/logging"
19 "github.com/opencode-ai/opencode/internal/message"
20)
21
22type anthropicOptions struct {
23 useBedrock bool
24 disableCache bool
25 shouldThink func(userMessage string) bool
26}
27
28type AnthropicOption func(*anthropicOptions)
29
30type anthropicClient struct {
31 providerOptions providerClientOptions
32 options anthropicOptions
33 client anthropic.Client
34}
35
36type AnthropicClient ProviderClient
37
38func newAnthropicClient(opts providerClientOptions) AnthropicClient {
39 anthropicOpts := anthropicOptions{}
40 for _, o := range opts.anthropicOptions {
41 o(&anthropicOpts)
42 }
43
44 anthropicClientOptions := []option.RequestOption{}
45 if opts.apiKey != "" {
46 anthropicClientOptions = append(anthropicClientOptions, option.WithAPIKey(opts.apiKey))
47 }
48 if anthropicOpts.useBedrock {
49 anthropicClientOptions = append(anthropicClientOptions, bedrock.WithLoadDefaultConfig(context.Background()))
50 }
51
52 client := anthropic.NewClient(anthropicClientOptions...)
53 return &anthropicClient{
54 providerOptions: opts,
55 options: anthropicOpts,
56 client: client,
57 }
58}
59
60func (a *anthropicClient) convertMessages(messages []message.Message) (anthropicMessages []anthropic.MessageParam) {
61 for i, msg := range messages {
62 cache := false
63 if i > len(messages)-3 {
64 cache = true
65 }
66 switch msg.Role {
67 case message.User:
68 content := anthropic.NewTextBlock(msg.Content().String())
69 if cache && !a.options.disableCache {
70 content.OfRequestTextBlock.CacheControl = anthropic.CacheControlEphemeralParam{
71 Type: "ephemeral",
72 }
73 }
74 var contentBlocks []anthropic.ContentBlockParamUnion
75 contentBlocks = append(contentBlocks, content)
76 for _, binaryContent := range msg.BinaryContent() {
77 base64Image := binaryContent.String(models.ProviderAnthropic)
78 imageBlock := anthropic.NewImageBlockBase64(binaryContent.MIMEType, base64Image)
79 contentBlocks = append(contentBlocks, imageBlock)
80 }
81 anthropicMessages = append(anthropicMessages, anthropic.NewUserMessage(contentBlocks...))
82
83 case message.Assistant:
84 blocks := []anthropic.ContentBlockParamUnion{}
85 if msg.Content().String() != "" {
86 content := anthropic.NewTextBlock(msg.Content().String())
87 if cache && !a.options.disableCache {
88 content.OfRequestTextBlock.CacheControl = anthropic.CacheControlEphemeralParam{
89 Type: "ephemeral",
90 }
91 }
92 blocks = append(blocks, content)
93 }
94
95 for _, toolCall := range msg.ToolCalls() {
96 var inputMap map[string]any
97 err := json.Unmarshal([]byte(toolCall.Input), &inputMap)
98 if err != nil {
99 continue
100 }
101 blocks = append(blocks, anthropic.ContentBlockParamOfRequestToolUseBlock(toolCall.ID, inputMap, toolCall.Name))
102 }
103
104 if len(blocks) == 0 {
105 logging.Warn("There is a message without content, investigate, this should not happen")
106 continue
107 }
108 anthropicMessages = append(anthropicMessages, anthropic.NewAssistantMessage(blocks...))
109
110 case message.Tool:
111 results := make([]anthropic.ContentBlockParamUnion, len(msg.ToolResults()))
112 for i, toolResult := range msg.ToolResults() {
113 results[i] = anthropic.NewToolResultBlock(toolResult.ToolCallID, toolResult.Content, toolResult.IsError)
114 }
115 anthropicMessages = append(anthropicMessages, anthropic.NewUserMessage(results...))
116 }
117 }
118 return
119}
120
121func (a *anthropicClient) convertTools(tools []tools.BaseTool) []anthropic.ToolUnionParam {
122 anthropicTools := make([]anthropic.ToolUnionParam, len(tools))
123
124 for i, tool := range tools {
125 info := tool.Info()
126 toolParam := anthropic.ToolParam{
127 Name: info.Name,
128 Description: anthropic.String(info.Description),
129 InputSchema: anthropic.ToolInputSchemaParam{
130 Properties: info.Parameters,
131 // TODO: figure out how we can tell claude the required fields?
132 },
133 }
134
135 if i == len(tools)-1 && !a.options.disableCache {
136 toolParam.CacheControl = anthropic.CacheControlEphemeralParam{
137 Type: "ephemeral",
138 }
139 }
140
141 anthropicTools[i] = anthropic.ToolUnionParam{OfTool: &toolParam}
142 }
143
144 return anthropicTools
145}
146
147func (a *anthropicClient) finishReason(reason string) message.FinishReason {
148 switch reason {
149 case "end_turn":
150 return message.FinishReasonEndTurn
151 case "max_tokens":
152 return message.FinishReasonMaxTokens
153 case "tool_use":
154 return message.FinishReasonToolUse
155 case "stop_sequence":
156 return message.FinishReasonEndTurn
157 default:
158 return message.FinishReasonUnknown
159 }
160}
161
162func (a *anthropicClient) preparedMessages(messages []anthropic.MessageParam, tools []anthropic.ToolUnionParam) anthropic.MessageNewParams {
163 var thinkingParam anthropic.ThinkingConfigParamUnion
164 lastMessage := messages[len(messages)-1]
165 isUser := lastMessage.Role == anthropic.MessageParamRoleUser
166 messageContent := ""
167 temperature := anthropic.Float(0)
168 if isUser {
169 for _, m := range lastMessage.Content {
170 if m.OfRequestTextBlock != nil && m.OfRequestTextBlock.Text != "" {
171 messageContent = m.OfRequestTextBlock.Text
172 }
173 }
174 if messageContent != "" && a.options.shouldThink != nil && a.options.shouldThink(messageContent) {
175 thinkingParam = anthropic.ThinkingConfigParamUnion{
176 OfThinkingConfigEnabled: &anthropic.ThinkingConfigEnabledParam{
177 BudgetTokens: int64(float64(a.providerOptions.maxTokens) * 0.8),
178 Type: "enabled",
179 },
180 }
181 temperature = anthropic.Float(1)
182 }
183 }
184
185 return anthropic.MessageNewParams{
186 Model: anthropic.Model(a.providerOptions.model.APIModel),
187 MaxTokens: a.providerOptions.maxTokens,
188 Temperature: temperature,
189 Messages: messages,
190 Tools: tools,
191 Thinking: thinkingParam,
192 System: []anthropic.TextBlockParam{
193 {
194 Text: a.providerOptions.systemMessage,
195 CacheControl: anthropic.CacheControlEphemeralParam{
196 Type: "ephemeral",
197 },
198 },
199 },
200 }
201}
202
203func (a *anthropicClient) send(ctx context.Context, messages []message.Message, tools []tools.BaseTool) (resposne *ProviderResponse, err error) {
204 preparedMessages := a.preparedMessages(a.convertMessages(messages), a.convertTools(tools))
205 cfg := config.Get()
206 if cfg.Debug {
207 jsonData, _ := json.Marshal(preparedMessages)
208 logging.Debug("Prepared messages", "messages", string(jsonData))
209 }
210
211 attempts := 0
212 for {
213 attempts++
214 anthropicResponse, err := a.client.Messages.New(
215 ctx,
216 preparedMessages,
217 )
218 // If there is an error we are going to see if we can retry the call
219 if err != nil {
220 logging.Error("Error in Anthropic API call", "error", err)
221 retry, after, retryErr := a.shouldRetry(attempts, err)
222 if retryErr != nil {
223 return nil, retryErr
224 }
225 if retry {
226 logging.WarnPersist(fmt.Sprintf("Retrying due to rate limit... attempt %d of %d", attempts, maxRetries), logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
227 select {
228 case <-ctx.Done():
229 return nil, ctx.Err()
230 case <-time.After(time.Duration(after) * time.Millisecond):
231 continue
232 }
233 }
234 return nil, retryErr
235 }
236
237 content := ""
238 for _, block := range anthropicResponse.Content {
239 if text, ok := block.AsAny().(anthropic.TextBlock); ok {
240 content += text.Text
241 }
242 }
243
244 return &ProviderResponse{
245 Content: content,
246 ToolCalls: a.toolCalls(*anthropicResponse),
247 Usage: a.usage(*anthropicResponse),
248 }, nil
249 }
250}
251
252func (a *anthropicClient) stream(ctx context.Context, messages []message.Message, tools []tools.BaseTool) <-chan ProviderEvent {
253 preparedMessages := a.preparedMessages(a.convertMessages(messages), a.convertTools(tools))
254 cfg := config.Get()
255 if cfg.Debug {
256 // jsonData, _ := json.Marshal(preparedMessages)
257 // logging.Debug("Prepared messages", "messages", string(jsonData))
258 }
259 attempts := 0
260 eventChan := make(chan ProviderEvent)
261 go func() {
262 for {
263 attempts++
264 anthropicStream := a.client.Messages.NewStreaming(
265 ctx,
266 preparedMessages,
267 )
268 accumulatedMessage := anthropic.Message{}
269
270 currentToolCallID := ""
271 for anthropicStream.Next() {
272 event := anthropicStream.Current()
273 err := accumulatedMessage.Accumulate(event)
274 if err != nil {
275 logging.Warn("Error accumulating message", "error", err)
276 continue
277 }
278
279 switch event := event.AsAny().(type) {
280 case anthropic.ContentBlockStartEvent:
281 if event.ContentBlock.Type == "text" {
282 eventChan <- ProviderEvent{Type: EventContentStart}
283 } else if event.ContentBlock.Type == "tool_use" {
284 currentToolCallID = event.ContentBlock.ID
285 eventChan <- ProviderEvent{
286 Type: EventToolUseStart,
287 ToolCall: &message.ToolCall{
288 ID: event.ContentBlock.ID,
289 Name: event.ContentBlock.Name,
290 Finished: false,
291 },
292 }
293 }
294
295 case anthropic.ContentBlockDeltaEvent:
296 if event.Delta.Type == "thinking_delta" && event.Delta.Thinking != "" {
297 eventChan <- ProviderEvent{
298 Type: EventThinkingDelta,
299 Thinking: event.Delta.Thinking,
300 }
301 } else if event.Delta.Type == "text_delta" && event.Delta.Text != "" {
302 eventChan <- ProviderEvent{
303 Type: EventContentDelta,
304 Content: event.Delta.Text,
305 }
306 } else if event.Delta.Type == "input_json_delta" {
307 if currentToolCallID != "" {
308 eventChan <- ProviderEvent{
309 Type: EventToolUseDelta,
310 ToolCall: &message.ToolCall{
311 ID: currentToolCallID,
312 Finished: false,
313 Input: event.Delta.JSON.PartialJSON.Raw(),
314 },
315 }
316 }
317 }
318 case anthropic.ContentBlockStopEvent:
319 if currentToolCallID != "" {
320 eventChan <- ProviderEvent{
321 Type: EventToolUseStop,
322 ToolCall: &message.ToolCall{
323 ID: currentToolCallID,
324 },
325 }
326 currentToolCallID = ""
327 } else {
328 eventChan <- ProviderEvent{Type: EventContentStop}
329 }
330
331 case anthropic.MessageStopEvent:
332 content := ""
333 for _, block := range accumulatedMessage.Content {
334 if text, ok := block.AsAny().(anthropic.TextBlock); ok {
335 content += text.Text
336 }
337 }
338
339 eventChan <- ProviderEvent{
340 Type: EventComplete,
341 Response: &ProviderResponse{
342 Content: content,
343 ToolCalls: a.toolCalls(accumulatedMessage),
344 Usage: a.usage(accumulatedMessage),
345 FinishReason: a.finishReason(string(accumulatedMessage.StopReason)),
346 },
347 }
348 }
349 }
350
351 err := anthropicStream.Err()
352 if err == nil || errors.Is(err, io.EOF) {
353 close(eventChan)
354 return
355 }
356 // If there is an error we are going to see if we can retry the call
357 retry, after, retryErr := a.shouldRetry(attempts, err)
358 if retryErr != nil {
359 eventChan <- ProviderEvent{Type: EventError, Error: retryErr}
360 close(eventChan)
361 return
362 }
363 if retry {
364 logging.WarnPersist(fmt.Sprintf("Retrying due to rate limit... attempt %d of %d", attempts, maxRetries), logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
365 select {
366 case <-ctx.Done():
367 // context cancelled
368 if ctx.Err() != nil {
369 eventChan <- ProviderEvent{Type: EventError, Error: ctx.Err()}
370 }
371 close(eventChan)
372 return
373 case <-time.After(time.Duration(after) * time.Millisecond):
374 continue
375 }
376 }
377 if ctx.Err() != nil {
378 eventChan <- ProviderEvent{Type: EventError, Error: ctx.Err()}
379 }
380
381 close(eventChan)
382 return
383 }
384 }()
385 return eventChan
386}
387
388func (a *anthropicClient) shouldRetry(attempts int, err error) (bool, int64, error) {
389 var apierr *anthropic.Error
390 if !errors.As(err, &apierr) {
391 return false, 0, err
392 }
393
394 if apierr.StatusCode != 429 && apierr.StatusCode != 529 {
395 return false, 0, err
396 }
397
398 if attempts > maxRetries {
399 return false, 0, fmt.Errorf("maximum retry attempts reached for rate limit: %d retries", maxRetries)
400 }
401
402 retryMs := 0
403 retryAfterValues := apierr.Response.Header.Values("Retry-After")
404
405 backoffMs := 2000 * (1 << (attempts - 1))
406 jitterMs := int(float64(backoffMs) * 0.2)
407 retryMs = backoffMs + jitterMs
408 if len(retryAfterValues) > 0 {
409 if _, err := fmt.Sscanf(retryAfterValues[0], "%d", &retryMs); err == nil {
410 retryMs = retryMs * 1000
411 }
412 }
413 return true, int64(retryMs), nil
414}
415
416func (a *anthropicClient) toolCalls(msg anthropic.Message) []message.ToolCall {
417 var toolCalls []message.ToolCall
418
419 for _, block := range msg.Content {
420 switch variant := block.AsAny().(type) {
421 case anthropic.ToolUseBlock:
422 toolCall := message.ToolCall{
423 ID: variant.ID,
424 Name: variant.Name,
425 Input: string(variant.Input),
426 Type: string(variant.Type),
427 Finished: true,
428 }
429 toolCalls = append(toolCalls, toolCall)
430 }
431 }
432
433 return toolCalls
434}
435
436func (a *anthropicClient) usage(msg anthropic.Message) TokenUsage {
437 return TokenUsage{
438 InputTokens: msg.Usage.InputTokens,
439 OutputTokens: msg.Usage.OutputTokens,
440 CacheCreationTokens: msg.Usage.CacheCreationInputTokens,
441 CacheReadTokens: msg.Usage.CacheReadInputTokens,
442 }
443}
444
445func WithAnthropicBedrock(useBedrock bool) AnthropicOption {
446 return func(options *anthropicOptions) {
447 options.useBedrock = useBedrock
448 }
449}
450
451func WithAnthropicDisableCache() AnthropicOption {
452 return func(options *anthropicOptions) {
453 options.disableCache = true
454 }
455}
456
457func DefaultShouldThinkFn(s string) bool {
458 return strings.Contains(strings.ToLower(s), "think")
459}
460
461func WithAnthropicShouldThinkFn(fn func(string) bool) AnthropicOption {
462 return func(options *anthropicOptions) {
463 options.shouldThink = fn
464 }
465}