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1 | 'use strict' | |
2 | ||
3 | const each = require('async/each') | |
4 | const eachLimit = require('async/eachLimit') | |
5 | const values = require('lodash/values') | |
6 | const mongoose = require('mongoose') | |
7 | const waterfall = require('async/waterfall') | |
8 | ||
9 | const constants = require('../initializers/constants') | |
10 | const logger = require('../helpers/logger') | |
11 | const requests = require('../helpers/requests') | |
12 | ||
13 | const Pod = mongoose.model('Pod') | |
14 | ||
15 | let timer = null | |
16 | let lastRequestTimestamp = 0 | |
17 | ||
18 | // --------------------------------------------------------------------------- | |
19 | ||
20 | const RequestSchema = mongoose.Schema({ | |
21 | request: mongoose.Schema.Types.Mixed, | |
22 | endpoint: { | |
23 | type: String, | |
24 | enum: [ values(constants.REQUEST_ENDPOINTS) ] | |
25 | }, | |
26 | to: [ | |
27 | { | |
28 | type: mongoose.Schema.Types.ObjectId, | |
29 | ref: 'Pod' | |
30 | } | |
31 | ] | |
32 | }) | |
33 | ||
34 | RequestSchema.statics = { | |
35 | activate, | |
36 | deactivate, | |
37 | flush, | |
38 | forceSend, | |
39 | list, | |
40 | remainingMilliSeconds | |
41 | } | |
42 | ||
43 | RequestSchema.pre('save', function (next) { | |
44 | const self = this | |
45 | ||
46 | if (self.to.length === 0) { | |
47 | Pod.listAllIds(function (err, podIds) { | |
48 | if (err) return next(err) | |
49 | ||
50 | // No friends | |
51 | if (podIds.length === 0) return | |
52 | ||
53 | self.to = podIds | |
54 | return next() | |
55 | }) | |
56 | } else { | |
57 | return next() | |
58 | } | |
59 | }) | |
60 | ||
61 | mongoose.model('Request', RequestSchema) | |
62 | ||
63 | // ------------------------------ STATICS ------------------------------ | |
64 | ||
65 | function activate () { | |
66 | logger.info('Requests scheduler activated.') | |
67 | lastRequestTimestamp = Date.now() | |
68 | ||
69 | const self = this | |
70 | timer = setInterval(function () { | |
71 | lastRequestTimestamp = Date.now() | |
72 | makeRequests.call(self) | |
73 | }, constants.REQUESTS_INTERVAL) | |
74 | } | |
75 | ||
76 | function deactivate () { | |
77 | logger.info('Requests scheduler deactivated.') | |
78 | clearInterval(timer) | |
79 | timer = null | |
80 | } | |
81 | ||
82 | function flush () { | |
83 | removeAll.call(this, function (err) { | |
84 | if (err) logger.error('Cannot flush the requests.', { error: err }) | |
85 | }) | |
86 | } | |
87 | ||
88 | function forceSend () { | |
89 | logger.info('Force requests scheduler sending.') | |
90 | makeRequests.call(this) | |
91 | } | |
92 | ||
93 | function list (callback) { | |
94 | this.find({ }, callback) | |
95 | } | |
96 | ||
97 | function remainingMilliSeconds () { | |
98 | if (timer === null) return -1 | |
99 | ||
100 | return constants.REQUESTS_INTERVAL - (Date.now() - lastRequestTimestamp) | |
101 | } | |
102 | ||
103 | // --------------------------------------------------------------------------- | |
104 | ||
105 | // Make a requests to friends of a certain type | |
106 | function makeRequest (toPod, requestEndpoint, requestsToMake, callback) { | |
107 | if (!callback) callback = function () {} | |
108 | ||
109 | const params = { | |
110 | toPod: toPod, | |
111 | encrypt: true, // Security | |
112 | sign: true, // To prove our identity | |
113 | method: 'POST', | |
114 | path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint, | |
115 | data: requestsToMake // Requests we need to make | |
116 | } | |
117 | ||
118 | // Make multiple retry requests to all of pods | |
119 | // The function fire some useful callbacks | |
120 | requests.makeSecureRequest(params, function (err, res) { | |
121 | if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) { | |
122 | logger.error( | |
123 | 'Error sending secure request to %s pod.', | |
124 | toPod.url, | |
125 | { | |
126 | error: err || new Error('Status code not 20x : ' + res.statusCode) | |
127 | } | |
128 | ) | |
129 | ||
130 | return callback(false) | |
131 | } | |
132 | ||
133 | return callback(true) | |
134 | }) | |
135 | } | |
136 | ||
137 | // Make all the requests of the scheduler | |
138 | function makeRequests () { | |
139 | const self = this | |
140 | ||
141 | // We limit the size of the requests (REQUESTS_LIMIT) | |
142 | // We don't want to stuck with the same failing requests so we get a random list | |
143 | listWithLimitAndRandom.call(self, constants.REQUESTS_LIMIT, function (err, requests) { | |
144 | if (err) { | |
145 | logger.error('Cannot get the list of requests.', { err: err }) | |
146 | return // Abort | |
147 | } | |
148 | ||
149 | // If there are no requests, abort | |
150 | if (requests.length === 0) { | |
151 | logger.info('No requests to make.') | |
152 | return | |
153 | } | |
154 | ||
155 | logger.info('Making requests to friends.') | |
156 | ||
157 | // We want to group requests by destinations pod and endpoint | |
158 | const requestsToMakeGrouped = {} | |
159 | ||
160 | requests.forEach(function (poolRequest) { | |
161 | poolRequest.to.forEach(function (toPodId) { | |
162 | const hashKey = toPodId + poolRequest.endpoint | |
163 | if (!requestsToMakeGrouped[hashKey]) { | |
164 | requestsToMakeGrouped[hashKey] = { | |
165 | toPodId, | |
166 | endpoint: poolRequest.endpoint, | |
167 | ids: [], // pool request ids, to delete them from the DB in the future | |
168 | datas: [] // requests data, | |
169 | } | |
170 | } | |
171 | ||
172 | requestsToMakeGrouped[hashKey].ids.push(poolRequest._id) | |
173 | requestsToMakeGrouped[hashKey].datas.push(poolRequest.request) | |
174 | }) | |
175 | }) | |
176 | ||
177 | const goodPods = [] | |
178 | const badPods = [] | |
179 | ||
180 | eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, function (hashKey, callbackEach) { | |
181 | const requestToMake = requestsToMakeGrouped[hashKey] | |
182 | ||
183 | // FIXME: mongodb request inside a loop :/ | |
184 | Pod.load(requestToMake.toPodId, function (err, toPod) { | |
185 | if (err) { | |
186 | logger.error('Error finding pod by id.', { err: err }) | |
187 | return callbackEach() | |
188 | } | |
189 | ||
190 | // Maybe the pod is not our friend anymore so simply remove it | |
191 | if (!toPod) { | |
192 | const requestIdsToDelete = requestToMake.ids | |
193 | ||
194 | logger.info('Removing %d requests of unexisting pod %s.', requestIdsToDelete.length, requestToMake.toPodId) | |
195 | removePodOf.call(self, requestIdsToDelete, requestToMake.toPodId) | |
196 | return callbackEach() | |
197 | } | |
198 | ||
199 | makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, function (success) { | |
200 | if (success === true) { | |
201 | logger.debug('Removing requests for %s pod.', requestToMake.toPodId, { requestsIds: requestToMake.ids }) | |
202 | ||
203 | goodPods.push(requestToMake.toPodId) | |
204 | ||
205 | // Remove the pod id of these request ids | |
206 | removePodOf.call(self, requestToMake.ids, requestToMake.toPodId, callbackEach) | |
207 | } else { | |
208 | badPods.push(requestToMake.toPodId) | |
209 | callbackEach() | |
210 | } | |
211 | }) | |
212 | }) | |
213 | }, function () { | |
214 | // All the requests were made, we update the pods score | |
215 | updatePodsScore(goodPods, badPods) | |
216 | // Flush requests with no pod | |
217 | removeWithEmptyTo.call(self) | |
218 | }) | |
219 | }) | |
220 | } | |
221 | ||
222 | // Remove pods with a score of 0 (too many requests where they were unreachable) | |
223 | function removeBadPods () { | |
224 | waterfall([ | |
225 | function findBadPods (callback) { | |
226 | Pod.listBadPods(function (err, pods) { | |
227 | if (err) { | |
228 | logger.error('Cannot find bad pods.', { error: err }) | |
229 | return callback(err) | |
230 | } | |
231 | ||
232 | return callback(null, pods) | |
233 | }) | |
234 | }, | |
235 | ||
236 | function removeTheseBadPods (pods, callback) { | |
237 | if (pods.length === 0) return callback(null, 0) | |
238 | ||
239 | each(pods, function (pod, callbackEach) { | |
240 | pod.remove(callbackEach) | |
241 | }, function (err) { | |
242 | return callback(err, pods.length) | |
243 | }) | |
244 | } | |
245 | ], function (err, numberOfPodsRemoved) { | |
246 | if (err) { | |
247 | logger.error('Cannot remove bad pods.', { error: err }) | |
248 | } else if (numberOfPodsRemoved) { | |
249 | logger.info('Removed %d pods.', numberOfPodsRemoved) | |
250 | } else { | |
251 | logger.info('No need to remove bad pods.') | |
252 | } | |
253 | }) | |
254 | } | |
255 | ||
256 | function updatePodsScore (goodPods, badPods) { | |
257 | logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length) | |
258 | ||
259 | Pod.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) { | |
260 | if (err) logger.error('Cannot increment scores of good pods.') | |
261 | }) | |
262 | ||
263 | Pod.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) { | |
264 | if (err) logger.error('Cannot decrement scores of bad pods.') | |
265 | removeBadPods() | |
266 | }) | |
267 | } | |
268 | ||
269 | function listWithLimitAndRandom (limit, callback) { | |
270 | const self = this | |
271 | ||
272 | self.count(function (err, count) { | |
273 | if (err) return callback(err) | |
274 | ||
275 | let start = Math.floor(Math.random() * count) - limit | |
276 | if (start < 0) start = 0 | |
277 | ||
278 | self.find().sort({ _id: 1 }).skip(start).limit(limit).exec(callback) | |
279 | }) | |
280 | } | |
281 | ||
282 | function removeAll (callback) { | |
283 | this.remove({ }, callback) | |
284 | } | |
285 | ||
286 | function removePodOf (requestsIds, podId, callback) { | |
287 | if (!callback) callback = function () {} | |
288 | ||
289 | this.update({ _id: { $in: requestsIds } }, { $pull: { to: podId } }, { multi: true }, callback) | |
290 | } | |
291 | ||
292 | function removeWithEmptyTo (callback) { | |
293 | if (!callback) callback = function () {} | |
294 | ||
295 | this.remove({ to: { $size: 0 } }, callback) | |
296 | } |