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1 | 'use strict' | |
2 | ||
3 | const async = require('async') | |
4 | const map = require('lodash/map') | |
5 | const mongoose = require('mongoose') | |
6 | ||
7 | const constants = require('../initializers/constants') | |
8 | const logger = require('../helpers/logger') | |
9 | const Pods = require('../models/pods') | |
10 | const requests = require('../helpers/requests') | |
11 | ||
12 | const Video = mongoose.model('Video') | |
13 | ||
14 | let timer = null | |
15 | ||
16 | // --------------------------------------------------------------------------- | |
17 | ||
18 | const RequestSchema = mongoose.Schema({ | |
19 | request: mongoose.Schema.Types.Mixed, | |
20 | to: [ { type: mongoose.Schema.Types.ObjectId, ref: 'users' } ] | |
21 | }) | |
22 | ||
23 | RequestSchema.statics = { | |
24 | activate, | |
25 | deactivate, | |
26 | flush, | |
27 | forceSend | |
28 | } | |
29 | ||
30 | RequestSchema.pre('save', function (next) { | |
31 | const self = this | |
32 | ||
33 | if (self.to.length === 0) { | |
34 | Pods.listAllIds(function (err, podIds) { | |
35 | if (err) return next(err) | |
36 | ||
37 | // No friends | |
38 | if (podIds.length === 0) return | |
39 | ||
40 | self.to = podIds | |
41 | return next() | |
42 | }) | |
43 | } else { | |
44 | return next() | |
45 | } | |
46 | }) | |
47 | ||
48 | mongoose.model('Request', RequestSchema) | |
49 | ||
50 | // ------------------------------ STATICS ------------------------------ | |
51 | ||
52 | function activate () { | |
53 | logger.info('Requests scheduler activated.') | |
54 | timer = setInterval(makeRequests.bind(this), constants.INTERVAL) | |
55 | } | |
56 | ||
57 | function deactivate () { | |
58 | logger.info('Requests scheduler deactivated.') | |
59 | clearInterval(timer) | |
60 | } | |
61 | ||
62 | function flush () { | |
63 | removeAll.call(this, function (err) { | |
64 | if (err) logger.error('Cannot flush the requests.', { error: err }) | |
65 | }) | |
66 | } | |
67 | ||
68 | function forceSend () { | |
69 | logger.info('Force requests scheduler sending.') | |
70 | makeRequests.call(this) | |
71 | } | |
72 | ||
73 | // --------------------------------------------------------------------------- | |
74 | ||
75 | // Make a requests to friends of a certain type | |
76 | function makeRequest (toPod, requestsToMake, callback) { | |
77 | if (!callback) callback = function () {} | |
78 | ||
79 | const params = { | |
80 | toPod: toPod, | |
81 | encrypt: true, // Security | |
82 | sign: true, // To prove our identity | |
83 | method: 'POST', | |
84 | path: '/api/' + constants.API_VERSION + '/remote/videos', | |
85 | data: requestsToMake // Requests we need to make | |
86 | } | |
87 | ||
88 | // Make multiple retry requests to all of pods | |
89 | // The function fire some useful callbacks | |
90 | requests.makeSecureRequest(params, function (err, res) { | |
91 | if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) { | |
92 | logger.error('Error sending secure request to %s pod.', toPod.url, { error: err || new Error('Status code not 20x') }) | |
93 | ||
94 | return callback(false) | |
95 | } | |
96 | ||
97 | return callback(true) | |
98 | }) | |
99 | } | |
100 | ||
101 | // Make all the requests of the scheduler | |
102 | function makeRequests () { | |
103 | const self = this | |
104 | ||
105 | list.call(self, function (err, requests) { | |
106 | if (err) { | |
107 | logger.error('Cannot get the list of requests.', { err: err }) | |
108 | return // Abort | |
109 | } | |
110 | ||
111 | // If there are no requests, abort | |
112 | if (requests.length === 0) { | |
113 | logger.info('No requests to make.') | |
114 | return | |
115 | } | |
116 | ||
117 | logger.info('Making requests to friends.') | |
118 | ||
119 | // Requests by pods id | |
120 | const requestsToMake = {} | |
121 | ||
122 | requests.forEach(function (poolRequest) { | |
123 | poolRequest.to.forEach(function (toPodId) { | |
124 | if (!requestsToMake[toPodId]) { | |
125 | requestsToMake[toPodId] = { | |
126 | ids: [], | |
127 | datas: [] | |
128 | } | |
129 | } | |
130 | ||
131 | requestsToMake[toPodId].ids.push(poolRequest._id) | |
132 | requestsToMake[toPodId].datas.push(poolRequest.request) | |
133 | }) | |
134 | }) | |
135 | ||
136 | const goodPods = [] | |
137 | const badPods = [] | |
138 | ||
139 | async.eachLimit(Object.keys(requestsToMake), constants.REQUESTS_IN_PARALLEL, function (toPodId, callbackEach) { | |
140 | const requestToMake = requestsToMake[toPodId] | |
141 | ||
142 | // FIXME: mongodb request inside a loop :/ | |
143 | Pods.findById(toPodId, function (err, toPod) { | |
144 | if (err) { | |
145 | logger.error('Error finding pod by id.', { err: err }) | |
146 | return callbackEach() | |
147 | } | |
148 | ||
149 | // Maybe the pod is not our friend anymore so simply remove them | |
150 | if (!toPod) { | |
151 | removePodOf.call(self, requestToMake.ids, toPodId) | |
152 | return callbackEach() | |
153 | } | |
154 | ||
155 | makeRequest(toPod, requestToMake.datas, function (success) { | |
156 | if (err) { | |
157 | logger.error('Errors when sent request to %s.', toPod.url, { error: err }) | |
158 | // Do not stop the process just for one error | |
159 | return callbackEach() | |
160 | } | |
161 | ||
162 | if (success === true) { | |
163 | logger.debug('Removing requests for %s pod.', toPodId, { requestsIds: requestToMake.ids }) | |
164 | ||
165 | // Remove the pod id of these request ids | |
166 | removePodOf.call(self, requestToMake.ids, toPodId) | |
167 | goodPods.push(toPodId) | |
168 | } else { | |
169 | badPods.push(toPodId) | |
170 | } | |
171 | ||
172 | callbackEach() | |
173 | }) | |
174 | }) | |
175 | }, function () { | |
176 | // All the requests were made, we update the pods score | |
177 | updatePodsScore(goodPods, badPods) | |
178 | // Flush requests with no pod | |
179 | removeWithEmptyTo.call(self) | |
180 | }) | |
181 | }) | |
182 | } | |
183 | ||
184 | // Remove pods with a score of 0 (too many requests where they were unreachable) | |
185 | function removeBadPods () { | |
186 | async.waterfall([ | |
187 | function findBadPods (callback) { | |
188 | Pods.findBadPods(function (err, pods) { | |
189 | if (err) { | |
190 | logger.error('Cannot find bad pods.', { error: err }) | |
191 | return callback(err) | |
192 | } | |
193 | ||
194 | return callback(null, pods) | |
195 | }) | |
196 | }, | |
197 | ||
198 | function listVideosOfTheseBadPods (pods, callback) { | |
199 | if (pods.length === 0) return callback(null) | |
200 | ||
201 | const urls = map(pods, 'url') | |
202 | const ids = map(pods, '_id') | |
203 | ||
204 | Video.listByUrls(urls, function (err, videosList) { | |
205 | if (err) { | |
206 | logger.error('Cannot list videos urls.', { error: err, urls: urls }) | |
207 | return callback(null, ids, []) | |
208 | } | |
209 | ||
210 | return callback(null, ids, videosList) | |
211 | }) | |
212 | }, | |
213 | ||
214 | function removeVideosOfTheseBadPods (podIds, videosList, callback) { | |
215 | // We don't have to remove pods, skip | |
216 | if (typeof podIds === 'function') return podIds(null) | |
217 | ||
218 | async.each(videosList, function (video, callbackEach) { | |
219 | video.remove(callbackEach) | |
220 | }, function (err) { | |
221 | if (err) { | |
222 | // Don't stop the process | |
223 | logger.error('Error while removing videos of bad pods.', { error: err }) | |
224 | return | |
225 | } | |
226 | ||
227 | return callback(null, podIds) | |
228 | }) | |
229 | }, | |
230 | ||
231 | function removeBadPodsFromDB (podIds, callback) { | |
232 | // We don't have to remove pods, skip | |
233 | if (typeof podIds === 'function') return podIds(null) | |
234 | ||
235 | Pods.removeAllByIds(podIds, callback) | |
236 | } | |
237 | ], function (err, removeResult) { | |
238 | if (err) { | |
239 | logger.error('Cannot remove bad pods.', { error: err }) | |
240 | } else if (removeResult) { | |
241 | const podsRemoved = removeResult.result.n | |
242 | logger.info('Removed %d pods.', podsRemoved) | |
243 | } else { | |
244 | logger.info('No need to remove bad pods.') | |
245 | } | |
246 | }) | |
247 | } | |
248 | ||
249 | function updatePodsScore (goodPods, badPods) { | |
250 | logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length) | |
251 | ||
252 | Pods.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) { | |
253 | if (err) logger.error('Cannot increment scores of good pods.') | |
254 | }) | |
255 | ||
256 | Pods.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) { | |
257 | if (err) logger.error('Cannot decrement scores of bad pods.') | |
258 | removeBadPods() | |
259 | }) | |
260 | } | |
261 | ||
262 | function list (callback) { | |
263 | this.find({ }, { _id: 1, request: 1, to: 1 }, callback) | |
264 | } | |
265 | ||
266 | function removeAll (callback) { | |
267 | this.remove({ }, callback) | |
268 | } | |
269 | ||
270 | function removePodOf (requestsIds, podId, callback) { | |
271 | if (!callback) callback = function () {} | |
272 | ||
273 | this.update({ _id: { $in: requestsIds } }, { $pull: { to: podId } }, { multi: true }, callback) | |
274 | } | |
275 | ||
276 | function removeWithEmptyTo (callback) { | |
277 | if (!callback) callback = function () {} | |
278 | ||
279 | this.remove({ to: { $size: 0 } }, callback) | |
280 | } |