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export class AnthropicResponseTransformer {
constructor(model, requestId) {
this.model = model;
this.requestId = requestId || `chatcmpl-${Date.now()}`;
this.created = Math.floor(Date.now() / 1000);
this.messageId = null;
this.currentIndex = 0;
}
parseSSELine(line) {
if (line.startsWith('event:')) {
return { type: 'event', value: line.slice(6).trim() };
}
if (line.startsWith('data:')) {
const dataStr = line.slice(5).trim();
try {
return { type: 'data', value: JSON.parse(dataStr) };
} catch (e) {
return { type: 'data', value: dataStr };
}
}
return null;
}
transformEvent(eventType, eventData) {
if (eventType === 'message_start') {
this.messageId = eventData.message?.id || this.requestId;
return this.createOpenAIChunk('', 'assistant', false);
}
if (eventType === 'content_block_start') {
return null;
}
if (eventType === 'content_block_delta') {
const text = eventData.delta?.text || '';
return this.createOpenAIChunk(text, null, false);
}
if (eventType === 'content_block_stop') {
return null;
}
if (eventType === 'message_delta') {
const stopReason = eventData.delta?.stop_reason;
if (stopReason) {
return this.createOpenAIChunk('', null, true, this.mapStopReason(stopReason));
}
return null;
}
if (eventType === 'message_stop') {
return this.createDoneSignal();
}
if (eventType === 'ping') {
return null;
}
return null;
}
createOpenAIChunk(content, role = null, finish = false, finishReason = null) {
const chunk = {
id: this.requestId,
object: 'chat.completion.chunk',
created: this.created,
model: this.model,
choices: [
{
index: 0,
delta: {},
finish_reason: finish ? finishReason : null
}
]
};
if (role) {
chunk.choices[0].delta.role = role;
}
if (content) {
chunk.choices[0].delta.content = content;
}
return `data: ${JSON.stringify(chunk)}\n\n`;
}
createDoneSignal() {
return 'data: [DONE]\n\n';
}
mapStopReason(anthropicReason) {
const mapping = {
'end_turn': 'stop',
'max_tokens': 'length',
'stop_sequence': 'stop',
'tool_use': 'tool_calls'
};
return mapping[anthropicReason] || 'stop';
}
async *transformStream(sourceStream) {
let buffer = '';
let currentEvent = null;
try {
for await (const chunk of sourceStream) {
buffer += chunk.toString();
const lines = buffer.split('\n');
buffer = lines.pop() || '';
for (const line of lines) {
if (!line.trim()) continue;
const parsed = this.parseSSELine(line);
if (!parsed) continue;
if (parsed.type === 'event') {
currentEvent = parsed.value;
} else if (parsed.type === 'data' && currentEvent) {
const transformed = this.transformEvent(currentEvent, parsed.value);
if (transformed) {
yield transformed;
}
currentEvent = null;
}
}
}
} catch (error) {
console.error('Anthropic 流转换错误:', error);
throw error;
}
}
}
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