41 lines
1.6 KiB
JavaScript
41 lines
1.6 KiB
JavaScript
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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exports.main = async event => {
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const { OPENID } = cloud.getWXContext()
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// Reading a non-existent collection throws in WeChat 云开发, and this function
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// starts with a read — so the collection would never get created by the later
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// add(). Create it up-front (no-op if it already exists) to break that deadlock.
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try {
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await db.createCollection('locations')
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} catch (e) {
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// -501001 / "already exists" is expected on every call after the first.
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}
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const now = Date.now()
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const loc = event.location || null
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const visible = Boolean(event.visible)
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const hasCoord = loc && typeof loc.latitude === 'number' && typeof loc.longitude === 'number'
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const data = {
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openid: OPENID,
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location: hasCoord ? { latitude: loc.latitude, longitude: loc.longitude } : null,
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// `nearbyPets` currently filters by distance in memory off `location`, so the
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// `visible` flag below is what gates discovery. `geo` is kept (Point form) only
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// to enable a future geoNear migration if the user base outgrows the in-memory
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// scan — it needs a manually-created geo index to be queried.
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geo: hasCoord && visible ? db.Geo.Point(loc.longitude, loc.latitude) : null,
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visible,
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updatedAt: now
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}
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const existed = await db.collection('locations').where({ openid: OPENID }).limit(1).get()
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if (existed.data.length) await db.collection('locations').doc(existed.data[0]._id).update({ data })
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else await db.collection('locations').add({ data })
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return { ok: true }
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}
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