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cloudfunctions/walkSave/index.js
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173
cloudfunctions/walkSave/index.js
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// 云函数 walkSave — 保存遛狗 + 原子更新 stats + 连续天数 + 成就判定
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// 契约见 docs/03-云函数设计.md §3 / §6
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// action: 'create'（默认，结束遛狗时调）| 'attach'（成果卡补充选填字段时调）
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const cloud = require('wx-server-sdk');
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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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const DAY = 86400000;
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const BASE_STRIDE = { xs: 0.20, s: 0.25, m: 0.35, l: 0.45, xl: 0.55 }; // 旧档无 stride 时兜底用
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// 时间戳 → 本地 yyyy-mm-dd（默认 +8）
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function toDateStr(ts, tz = 8) {
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const d = new Date(ts + tz * 3600 * 1000);
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const y = d.getUTCFullYear();
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const m = String(d.getUTCMonth() + 1).padStart(2, '0');
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const day = String(d.getUTCDate()).padStart(2, '0');
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return `${y}-${m}-${day}`;
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}
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function diffDays(a, b) {
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return Math.round((Date.parse(b + 'T00:00:00Z') - Date.parse(a + 'T00:00:00Z')) / DAY);
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}
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// 本地小时（默认 +8），用于「早起鸟」场景判定
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function localHour(ts, tz = 8) {
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return new Date(ts + tz * 3600 * 1000).getUTCHours();
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}
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// 连续天数算法（docs/05 R10）：从该狗全部 walkDate 重算，保证补记任意顺序都能正确续/断签。
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// 同日多次自动去重；以最新日期为锚，向前连续 +1，遇断签停止。
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async function computeStreak(openid, dogId) {
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const res = await db.collection('walks')
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.where({ _openid: openid, dogIds: dogId })
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.field({ walkDate: true })
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.orderBy('walkDate', 'desc')
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.limit(1000)
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.get();
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const dates = Array.from(new Set(res.data.map((w) => w.walkDate).filter(Boolean))).sort(); // 升序
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if (!dates.length) return { currentStreak: 0, lastWalkDate: '' };
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const lastWalkDate = dates[dates.length - 1];
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let streak = 1;
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for (let i = dates.length - 1; i > 0; i--) {
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if (diffDays(dates[i - 1], dates[i]) === 1) streak++;
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else break;
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}
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return { currentStreak: streak, lastWalkDate };
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}
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// 累计/连续类成就（基于更新后的 stats）
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const STAT_ACHIEVEMENTS = [
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{ key: 'first_walk', name: '首遛', cond: (s) => s.totalWalks >= 1 },
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{ key: 'week_streak', name: '一周不断', cond: (s) => s.currentStreak >= 7 },
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{ key: 'month_streak', name: '满月坚持', cond: (s) => s.currentStreak >= 30 },
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{ key: 'hundred_km', name: '百里同行', cond: (s) => s.totalDistance >= 100 },
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{ key: 'early_bird', name: '早起鸟', cond: (s) => (s.earlyWalks || 0) >= 10 }, // 场景类：累计早遛 10 次（仅实时遛狗计入）
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];
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// 解锁成就（去重：同一 dog 同一 key 不重复）
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async function unlockAchievements(openid, dogId, candidates) {
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if (!candidates.length) return [];
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const col = db.collection('dog_achievements');
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const existing = await col.where({ dogId }).field({ achievementKey: true }).get();
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const have = new Set(existing.data.map((d) => d.achievementKey));
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const fresh = candidates.filter((c) => !have.has(c.key));
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const now = Date.now();
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for (const c of fresh) {
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await col.add({ data: { _openid: openid, dogId, achievementKey: c.key, unlockedAt: now } });
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}
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return fresh.map((c) => ({ key: c.key, name: c.name }));
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}
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exports.main = async (event) => {
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const { OPENID } = cloud.getWXContext();
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const action = event.action || 'create';
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// ===== attach：成果卡补充选填字段（docs/05 R6）=====
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if (action === 'attach') {
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const { walkId } = event;
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if (!walkId) return { ok: false, code: 'INVALID', msg: '缺少 walkId' };
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const walkRes = await db.collection('walks').doc(walkId).get().catch(() => null);
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if (!walkRes || !walkRes.data || walkRes.data._openid !== OPENID) {
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return { ok: false, code: 'FORBIDDEN', msg: '无权操作' };
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}
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const weather = event.weather || null;
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const patch = {
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weather,
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mood: event.mood || null,
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note: event.note || null,
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photos: event.photos || [],
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};
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await db.collection('walks').doc(walkId).update({ data: patch });
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// 场景类成就：雨天战士（天气是事后补的，故在此判定）
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let newAchievements = [];
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if (weather === 'rainy') {
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for (const dogId of walkRes.data.dogIds || []) {
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const got = await unlockAchievements(OPENID, dogId, [{ key: 'rainy_warrior', name: '雨天战士' }]);
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newAchievements = newAchievements.concat(got);
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}
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}
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return { ok: true, data: { newAchievements } };
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}
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// ===== finish：结束遛狗，落库 + 统计 + 成就 =====
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const { dogIds, startAt, endAt, duration } = event;
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// 客户端只传 GPS 距离（米，未授权为 null）；狗步由服务端按每只狗 stride 算（docs/05 R3）
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const distanceMeters = event.distanceMeters != null ? Number(event.distanceMeters) : null;
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const distance = distanceMeters != null ? +(distanceMeters / 1000).toFixed(2) : null; // 公里
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const pooped = !!event.pooped;
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if (!Array.isArray(dogIds) || dogIds.length === 0) {
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return { ok: false, code: 'INVALID', msg: '缺少遛狗对象' };
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}
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const now = Date.now();
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const walkDate = toDateStr(endAt || now);
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// 早起鸟：以开始时间的本地小时判定，<7 点记一次「早遛」（场景类，仅实时遛狗计入）
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const isEarly = startAt != null && localHour(startAt) < 7;
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const addRes = await db.collection('walks').add({
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data: {
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_openid: OPENID,
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dogIds, startAt, endAt, duration,
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distance, dogSteps: null, pooped, // dogSteps（代表狗）循环后回填
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weather: null, mood: null, note: null, photos: [],
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source: 'realtime',
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isManual: false,
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countsForRanking: true,
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walkDate,
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createdAt: now,
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},
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});
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const walkId = addRes._id;
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const results = [];
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let newAchievements = [];
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let repSteps = null; // 代表狗（dogIds[0]）的狗步，写回 walk 用
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for (const dogId of dogIds) {
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const dogRes = await db.collection('dogs').doc(dogId).get().catch(() => null);
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if (!dogRes || !dogRes.data || dogRes.data._openid !== OPENID) continue;
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const dog = dogRes.data;
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const s = dog.stats || { totalWalks: 0, totalDistance: 0, totalSteps: 0, currentStreak: 0, lastWalkDate: '' };
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// 每只狗按自身 stride 换算狗步（旧档无 stride 时兜底 0.35m）
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const stride = dog.stride || BASE_STRIDE[dog.sizeLevel] || 0.35;
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const steps = distanceMeters != null ? Math.round(distanceMeters / stride) : null;
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if (dogId === dogIds[0]) repSteps = steps;
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// 连续天数按全部历史重算（已含本条，刚 add 入库）
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const streakInfo = await computeStreak(OPENID, dogId);
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const newStats = {
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totalWalks: (s.totalWalks || 0) + 1,
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totalDistance: +(((s.totalDistance || 0) + (distance || 0)).toFixed(2)),
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totalSteps: (s.totalSteps || 0) + (steps || 0),
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earlyWalks: (s.earlyWalks || 0) + (isEarly ? 1 : 0),
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currentStreak: streakInfo.currentStreak,
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lastWalkDate: streakInfo.lastWalkDate,
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};
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await db.collection('dogs').doc(dogId).update({ data: { stats: newStats } });
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const satisfied = STAT_ACHIEVEMENTS
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.filter((a) => a.cond(newStats))
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.map((a) => ({ key: a.key, name: a.name }));
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newAchievements = newAchievements.concat(await unlockAchievements(OPENID, dogId, satisfied));
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results.push({ dogId, name: dog.name, duration, dogSteps: steps, distance, streak: newStats.currentStreak });
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}
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if (repSteps != null) {
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await db.collection('walks').doc(walkId).update({ data: { dogSteps: repSteps } });
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}
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// 用户累计次数 +1
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await db.collection('users').where({ _openid: OPENID }).update({ data: { walkCount: _.inc(1) } });
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return { ok: true, data: { walkId, results, newAchievements } };
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};
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9
cloudfunctions/walkSave/package.json
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9
cloudfunctions/walkSave/package.json
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@@ -0,0 +1,9 @@
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{
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"name": "walkSave",
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"version": "1.0.0",
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"description": "保存遛狗 + 原子更新stats + 连续天数 + 成就判定",
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"main": "index.js",
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"dependencies": {
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"wx-server-sdk": "~2.6.3"
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}
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}
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