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| 1 | +'use strict'; |
| 2 | + |
| 3 | +import redisUrl from 'redis-url'; |
| 4 | +import nodeGeocoder from 'node-geocoder'; |
| 5 | +import Promise from 'bluebird'; |
| 6 | + |
| 7 | +let client; |
| 8 | + |
| 9 | +const setCache = (uri) => { |
| 10 | + try { |
| 11 | + client = redisUrl.connect(uri); |
| 12 | + Promise.promisifyAll(Object.getPrototypeOf(client)); |
| 13 | + } catch (err) { |
| 14 | + throw err; |
| 15 | + } |
| 16 | +}; |
| 17 | + |
| 18 | +const getReverse = (lat, lng) => { |
| 19 | + return new Promise((resolve, reject) => { |
| 20 | + const geocoderProvider = 'google'; |
| 21 | + const httpAdapter = 'http'; |
| 22 | + const geocoder = nodeGeocoder(geocoderProvider, httpAdapter); |
| 23 | + geocoder.reverse({lat: lat, lon: lng}).then(res => { |
| 24 | + if (res.length === 0) resolve(null); |
| 25 | + resolve(res[0].formattedAddress.split(',').map(x => x.trim()).slice(0, 2).join(', ')); |
| 26 | + }).catch(reject); |
| 27 | + }); |
| 28 | +}; |
| 29 | + |
| 30 | +const getCoordinates = (loc) => { |
| 31 | + return new Promise((resolve, reject) => { |
| 32 | + try { |
| 33 | + const [lng, lat] = loc.coordinates; |
| 34 | + resolve({lng: lng, lat: lat}); |
| 35 | + } catch (err) { |
| 36 | + reject(err); |
| 37 | + } |
| 38 | + }); |
| 39 | +}; |
| 40 | + |
| 41 | +const getFromCache = (lat, lng) => { |
| 42 | + return new Promise((resolve, reject) => { |
| 43 | + client.getAsync(`geocoder:${lat}:${lng}`).then(resolve).catch(reject); |
| 44 | + }); |
| 45 | +}; |
| 46 | + |
| 47 | +const getAddress = (loc) => { |
| 48 | + return new Promise((resolve, reject) => { |
| 49 | + getCoordinates(loc).then(({lng, lat}) => { |
| 50 | + if (client) { |
| 51 | + getFromCache(lat, lng).then(reply => { |
| 52 | + if (reply) resolve(reply); |
| 53 | + getReverse(lat, lng).then(address => { |
| 54 | + if (!address) resolve(null); |
| 55 | + client.set(`geocoder:${lat}:${lng}`, address); |
| 56 | + resolve(address); |
| 57 | + }).catch(reject); |
| 58 | + }).catch(reject); |
| 59 | + } else { |
| 60 | + getReverse(lat, lng).then(resolve).catch(reject); |
| 61 | + } |
| 62 | + }).catch(reject); |
| 63 | + }); |
| 64 | +}; |
| 65 | + |
| 66 | +const clearCache = (lat, lng) => { |
| 67 | + if (client) { |
| 68 | + client.del(`geocoder:${lat}:${lng}`); |
| 69 | + } |
| 70 | +}; |
| 71 | + |
| 72 | +module.exports = { |
| 73 | + setCache: setCache, |
| 74 | + getAddress: getAddress, |
| 75 | + getFromCache: getFromCache, |
| 76 | + clearCache: clearCache |
| 77 | +}; |
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