feat(mini-program): 短篇小说 SSE 流式服务

mini-program/src/services/shortNovel.js

@@ -0,0 +1,134 @@
+import { getApiBaseUrl, getAuthHeader } from './request.js'
+
+/**
+ * 短篇小说外部服务 API 封装
+ * 通过后端 SSE 代理调用外部 short-novel-service
+ */
+
+/**
+ * 首次发起短篇小说生成（SSE 流式）
+ * @param {Object} params
+ * @param {string} params.query - 用户心愿文本
+ * @param {Function} params.onEvent - 事件回调 (event) => void，event 包含 type、session_id、payload
+ * @param {Function} params.onError - 错误回调
+ * @returns {Object} uni.request 任务对象（用于 abort）
+ */
+export const startNovelStream = ({ query, onEvent, onError }) => {
+  const task = uni.request({
+    url: `${getApiBaseUrl()}/shortNovel/stream`,
+    method: 'POST',
+    data: { query },
+    header: {
+      'Content-Type': 'application/json',
+      'Accept': 'text/event-stream',
+      ...getAuthHeader()
+    },
+    enableChunked: true,
+    timeout: 300000,
+    success: (res) => {
+      if (res.statusCode >= 400) {
+        onError?.(res.data?.message || '请求失败')
+        return
+      }
+      if (typeof res.data === 'string' && res.data) {
+        consumeSseText(res.data, onEvent, onError)
+      }
+    },
+    fail: (error) => {
+      onError?.(error.errMsg || '网络请求失败')
+    }
+  })
+
+  task?.onChunkReceived?.((res) => {
+    try {
+      const text = decodeChunk(res.data)
+      consumeSseText(text, onEvent, onError)
+    } catch (error) {
+      onError?.(error.message || '流式解析失败')
+    }
+  })
+
+  return task
+}
+
+/**
+ * 后续轮次（澄清回答、大纲确认/修改、重试）
+ * @param {Object} params
+ * @param {string} params.sessionId - 外部服务的 session_id
+ * @param {string} params.action - answer_clarification | confirm_outline | modify_outline | retry
+ * @param {Object} params.payload - 操作载荷
+ * @param {Function} params.onEvent
+ * @param {Function} params.onError
+ * @returns {Object} uni.request 任务对象
+ */
+export const followupStream = ({ sessionId, action, payload, onEvent, onError }) => {
+  const task = uni.request({
+    url: `${getApiBaseUrl()}/shortNovel/followup`,
+    method: 'POST',
+    data: { sessionId, action, payload },
+    header: {
+      'Content-Type': 'application/json',
+      'Accept': 'text/event-stream',
+      ...getAuthHeader()
+    },
+    enableChunked: true,
+    timeout: 300000,
+    success: (res) => {
+      if (res.statusCode >= 400) {
+        onError?.(res.data?.message || '请求失败')
+        return
+      }
+      if (typeof res.data === 'string' && res.data) {
+        consumeSseText(res.data, onEvent, onError)
+      }
+    },
+    fail: (error) => {
+      onError?.(error.errMsg || '网络请求失败')
+    }
+  })
+
+  task?.onChunkReceived?.((res) => {
+    try {
+      const text = decodeChunk(res.data)
+      consumeSseText(text, onEvent, onError)
+    } catch (error) {
+      onError?.(error.message || '流式解析失败')
+    }
+  })
+
+  return task
+}
+
+/**
+ * 解码 chunk 数据
+ */
+function decodeChunk(chunk) {
+  if (typeof chunk === 'string') return chunk
+  const decoder = new TextDecoder('utf-8')
+  return decoder.decode(new Uint8Array(chunk))
+}
+
+/**
+ * 解析 SSE 文本
+ * 外部服务事件格式：data: {"type":"status","session_id":"xxx","payload":{...}}
+ */
+function consumeSseText(text, onEvent, onError) {
+  const lines = text.split(/\r?\n/)
+  let dataBuffer = ''
+
+  for (const line of lines) {
+    if (line.startsWith('data:')) {
+      dataBuffer += line.slice(5).trim()
+    } else if (line === '' && dataBuffer) {
+      const dataStr = dataBuffer
+      dataBuffer = ''
+      if (dataStr === '[DONE]') return
+      try {
+        const event = JSON.parse(dataStr)
+        onEvent?.(event)
+      } catch (e) {
+        onError?.(`SSE 解析失败: ${e.message}`)
+      }
+    }
+  }
+}