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2026-02-04 16:11:55 +08:00
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// 云函数入口文件
const cloud = require('wx-server-sdk')
const axios = require('axios')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()
const _ = db.command
exports.main = async (event, context) => {
const { roomId } = event
try {
// 1. 获取房间信息
const room = await db.collection('rooms').doc(roomId).get()
const data = room.data
if (!data) return { success: false, msg: '房间不存在' }
// 检查是否正在计算中(防并发)
if (data.status === 'calculating') {
return {
success: false,
msg: '正在计算中,请稍候...',
isCalculating: true
}
}
// 2. 提取有效坐标
const validMembers = data.members.filter(m => m.location && m.location.lat)
const locations = validMembers.map(m => ({
lng: m.location.lng,
lat: m.location.lat,
address: m.location.address || '',
name: m.location.name || ''
}))
// 验证至少需要2个位置才能计算
if (locations.length < 2) {
return { success: false, msg: '至少需要2人添加位置才能计算推荐地点' }
}
// 检查成员列表是否有变化(防止成员未变时重复计算)
if (data.status === 'calculated' && data.result && data.result.success) {
// 比较当前成员位置的数量和组成
const currentMemberIds = validMembers
.map(m => `${m.openid}_${m.location.lat}_${m.location.lng}`)
.sort()
.join(',')
// 存储上次计算时的成员快照
const lastMemberIds = data.lastCalculatedMembers || ''
if (currentMemberIds === lastMemberIds) {
return {
success: false,
msg: '成员位置未变化,无需重复计算',
isDuplicate: true,
existingResult: data.result
}
}
}
// 加锁:设置状态为计算中
await db.collection('rooms').doc(roomId).update({
data: {
status: _.set('calculating'),
calculateStartTime: _.set(db.serverDate())
}
})
console.log(`Room ${roomId} 状态已锁定为 calculating`)
// 3. 配置后端服务 URL请替换为实际部署的后端服务地址
// 示例:
// - 本地开发: http://localhost:8000
// - Render 部署: https://meetspot-xxx.onrender.com
// - Railway 部署: https://meetspot-production.railway.app
const BACKEND_URL = process.env.BACKEND_URL || 'https://meetspot.onrender.com'
console.log(`调用后端服务: ${BACKEND_URL}/api/miniprogram/calculate`)
// 4. 使用 HTTP 调用后端服务
const response = await axios.post(
`${BACKEND_URL}/api/miniprogram/calculate`,
{
locations: locations,
keywords: data.keywords || '咖啡馆',
requirements: data.requirements || ''
},
{
headers: {
'Content-Type': 'application/json'
},
timeout: 30000 // 30秒超时
}
)
const result = response.data
if (response.status !== 200 || !result) {
console.error('Backend Error:', response.status, result)
return { success: false, msg: '计算服务异常' }
}
// 5. 将结果回写到数据库
if (result.success) {
// 生成成员位置快照用于下次比对
const memberSnapshot = validMembers
.map(m => `${m.openid}_${m.location.lat}_${m.location.lng}`)
.sort()
.join(',')
await db.collection('rooms').doc(roomId).update({
data: {
result: _.set(result), // 使用 _.set 强制覆写 result 字段
status: _.set('calculated'), // 使用 _.set 强制覆写 status 字段
lastCalculateTime: _.set(db.serverDate()), // 记录计算时间
lastCalculatedMembers: _.set(memberSnapshot) // 记录成员快照
}
})
} else {
// 计算失败,释放锁
await db.collection('rooms').doc(roomId).update({
data: {
status: _.set('active')
}
})
}
return result
} catch (err) {
console.error('CalculateMeetSpot Error:', err)
// 发生异常时,释放锁
try {
await db.collection('rooms').doc(roomId).update({
data: {
status: _.set('active')
}
})
} catch (unlockErr) {
console.error('Failed to unlock room:', unlockErr)
}
return {
success: false,
msg: '计算失败',
error: err.message || err.toString()
}
}
}

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{
"name": "calculateMeetSpot",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"dependencies": {
"wx-server-sdk": "3.0.1",
"axios": "^1.6.0"
}
}