Function handleChatCompletion

src/controllers/chat.js:769–801

(req, res)

                                ]
                            },
                            "finish_reason": null
                        }
                    ]
                }
                res.write(`data: ${JSON.stringify(headerDelta)}\n\n`)

                const argsString = call.function.arguments || ''
                for (let offset = 0; offset < argsString.length; offset += ARG_CHUNK_SIZE) {
                    const piece = argsString.slice(offset, offset + ARG_CHUNK_SIZE)
                    const argDelta = {
                        "id": `chatcmpl-${message_id}`,
                        "object": "chat.completion.chunk",
                        "created": Math.round(new Date().getTime() / 1000),
                        "choices": [
                            {
                                "index": 0,
                                "delta": {
                                    "tool_calls": [
                                        {
                                            "index": index,
                                            "function": { "arguments": piece }
                                        }
                                    ]
                                },
                                "finish_reason": null
                            }
                        ]
                    }
                    res.write(`data: ${JSON.stringify(argDelta)}\n\n`)
                }
            }
        }

        /**
         * 处理一个 SSE data 段（已剥离 'data: ' 前缀）
         * @param {string} dataContent - 原始 data 段