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