153 lines
5.1 KiB
JavaScript
153 lines
5.1 KiB
JavaScript
// 云函数入口文件
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const cloud = require('wx-server-sdk')
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const axios = require('axios')
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cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
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const db = cloud.database()
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const _ = db.command
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exports.main = async (event, context) => {
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const { roomId } = event
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try {
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// 1. 获取房间信息
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const room = await db.collection('rooms').doc(roomId).get()
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const data = room.data
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if (!data) return { success: false, msg: '房间不存在' }
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// 检查是否正在计算中（防并发）
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if (data.status === 'calculating') {
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return {
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success: false,
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msg: '正在计算中，请稍候...',
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isCalculating: true
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}
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}
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// 2. 提取有效坐标
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const validMembers = data.members.filter(m => m.location && m.location.lat)
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const locations = validMembers.map(m => ({
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lng: m.location.lng,
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lat: m.location.lat,
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address: m.location.address || '',
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name: m.location.name || ''
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}))
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// 验证：至少需要2个位置才能计算
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if (locations.length < 2) {
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return { success: false, msg: '至少需要2人添加位置才能计算推荐地点' }
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}
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// 检查成员列表是否有变化（防止成员未变时重复计算）
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if (data.status === 'calculated' && data.result && data.result.success) {
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// 比较当前成员位置的数量和组成
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const currentMemberIds = validMembers
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.map(m => `${m.openid}_${m.location.lat}_${m.location.lng}`)
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.sort()
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.join(',')
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// 存储上次计算时的成员快照
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const lastMemberIds = data.lastCalculatedMembers || ''
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if (currentMemberIds === lastMemberIds) {
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return {
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success: false,
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msg: '成员位置未变化，无需重复计算',
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isDuplicate: true,
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existingResult: data.result
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}
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}
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}
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// 加锁：设置状态为计算中
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await db.collection('rooms').doc(roomId).update({
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data: {
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status: _.set('calculating'),
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calculateStartTime: _.set(db.serverDate())
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}
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})
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console.log(`Room ${roomId} 状态已锁定为 calculating`)
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// 3. 配置后端服务 URL（请替换为实际部署的后端服务地址）
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// 示例：
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// - 本地开发: http://localhost:8000
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// - Render 部署: https://meetspot-xxx.onrender.com
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// - Railway 部署: https://meetspot-production.railway.app
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const BACKEND_URL = process.env.BACKEND_URL || 'https://meetspot.onrender.com'
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console.log(`调用后端服务: ${BACKEND_URL}/api/miniprogram/calculate`)
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// 4. 使用 HTTP 调用后端服务
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const response = await axios.post(
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`${BACKEND_URL}/api/miniprogram/calculate`,
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{
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locations: locations,
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keywords: data.keywords || '咖啡馆',
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requirements: data.requirements || ''
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},
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{
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headers: {
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'Content-Type': 'application/json'
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},
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timeout: 30000 // 30秒超时
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}
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)
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const result = response.data
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if (response.status !== 200 || !result) {
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console.error('Backend Error:', response.status, result)
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return { success: false, msg: '计算服务异常' }
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}
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// 5. 将结果回写到数据库
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if (result.success) {
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// 生成成员位置快照用于下次比对
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const memberSnapshot = validMembers
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.map(m => `${m.openid}_${m.location.lat}_${m.location.lng}`)
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.sort()
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.join(',')
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await db.collection('rooms').doc(roomId).update({
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data: {
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result: _.set(result), // 使用 _.set 强制覆写 result 字段
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status: _.set('calculated'), // 使用 _.set 强制覆写 status 字段
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lastCalculateTime: _.set(db.serverDate()), // 记录计算时间
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lastCalculatedMembers: _.set(memberSnapshot) // 记录成员快照
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}
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})
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} else {
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// 计算失败，释放锁
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await db.collection('rooms').doc(roomId).update({
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data: {
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status: _.set('active')
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}
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})
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}
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return result
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} catch (err) {
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console.error('CalculateMeetSpot Error:', err)
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// 发生异常时，释放锁
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try {
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await db.collection('rooms').doc(roomId).update({
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data: {
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status: _.set('active')
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}
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})
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} catch (unlockErr) {
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console.error('Failed to unlock room:', unlockErr)
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}
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return {
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success: false,
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msg: '计算失败',
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error: err.message || err.toString()
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}
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}
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}
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