system commit

backend/src/services/openaiService.ts

@@ -0,0 +1,30 @@
+import OpenAI from 'openai';
+
+const client = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });
+
+export interface ChatCompletionChunk {
+  text: string;
+  done?: boolean;
+}
+
+export async function *streamChat(model: string, messages: { role: 'user'|'assistant'|'system'; content: string }[]) {
+  // 使用新的 responses API (若版本支持)；否则回退到 chat.completions
+  const stream = await client.chat.completions.create({
+    model,
+    messages,
+    stream: true,
+    temperature: 0.7,
+  });
+  for await (const part of stream) {
+    const delta = part.choices?.[0]?.delta?.content;
+    if (delta) {
+      yield { text: delta } as ChatCompletionChunk;
+    }
+  }
+  yield { text: '', done: true };
+}
+
+export async function oneShot(model: string, messages: { role: 'user'|'assistant'|'system'; content: string }[]) {
+  const completion = await client.chat.completions.create({ model, messages });
+  return completion.choices[0]?.message?.content || '';
+}