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1 | 'use strict' | |
2 | ||
3 | const each = require('async/each') | |
4 | const eachLimit = require('async/eachLimit') | |
5 | const waterfall = require('async/waterfall') | |
6 | const values = require('lodash/values') | |
7 | ||
8 | const constants = require('../initializers/constants') | |
9 | const logger = require('../helpers/logger') | |
10 | const requests = require('../helpers/requests') | |
11 | ||
12 | let timer = null | |
13 | let lastRequestTimestamp = 0 | |
14 | ||
15 | // --------------------------------------------------------------------------- | |
16 | ||
17 | module.exports = function (sequelize, DataTypes) { | |
18 | const Request = sequelize.define('Request', | |
19 | { | |
20 | request: { | |
21 | type: DataTypes.JSON, | |
22 | allowNull: false | |
23 | }, | |
24 | endpoint: { | |
25 | type: DataTypes.ENUM(values(constants.REQUEST_ENDPOINTS)), | |
26 | allowNull: false | |
27 | } | |
28 | }, | |
29 | { | |
30 | classMethods: { | |
31 | associate, | |
32 | ||
33 | activate, | |
34 | countTotalRequests, | |
35 | deactivate, | |
36 | flush, | |
37 | forceSend, | |
38 | remainingMilliSeconds | |
39 | } | |
40 | } | |
41 | ) | |
42 | ||
43 | return Request | |
44 | } | |
45 | ||
46 | // ------------------------------ STATICS ------------------------------ | |
47 | ||
48 | function associate (models) { | |
49 | this.belongsToMany(models.Pod, { | |
50 | foreignKey: { | |
51 | name: 'requestId', | |
52 | allowNull: false | |
53 | }, | |
54 | through: models.RequestToPod, | |
55 | onDelete: 'CASCADE' | |
56 | }) | |
57 | } | |
58 | ||
59 | function activate () { | |
60 | logger.info('Requests scheduler activated.') | |
61 | lastRequestTimestamp = Date.now() | |
62 | ||
63 | const self = this | |
64 | timer = setInterval(function () { | |
65 | lastRequestTimestamp = Date.now() | |
66 | makeRequests.call(self) | |
67 | }, constants.REQUESTS_INTERVAL) | |
68 | } | |
69 | ||
70 | function countTotalRequests (callback) { | |
71 | const query = { | |
72 | include: [ this.sequelize.models.Pod ] | |
73 | } | |
74 | ||
75 | return this.count(query).asCallback(callback) | |
76 | } | |
77 | ||
78 | function deactivate () { | |
79 | logger.info('Requests scheduler deactivated.') | |
80 | clearInterval(timer) | |
81 | timer = null | |
82 | } | |
83 | ||
84 | function flush (callback) { | |
85 | removeAll.call(this, function (err) { | |
86 | if (err) logger.error('Cannot flush the requests.', { error: err }) | |
87 | ||
88 | return callback(err) | |
89 | }) | |
90 | } | |
91 | ||
92 | function forceSend () { | |
93 | logger.info('Force requests scheduler sending.') | |
94 | makeRequests.call(this) | |
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 | sign: true, // Prove our identity | |
112 | method: 'POST', | |
113 | path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint, | |
114 | data: requestsToMake // Requests we need to make | |
115 | } | |
116 | ||
117 | // Make multiple retry requests to all of pods | |
118 | // The function fire some useful callbacks | |
119 | requests.makeSecureRequest(params, function (err, res) { | |
120 | if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) { | |
121 | logger.error( | |
122 | 'Error sending secure request to %s pod.', | |
123 | toPod.host, | |
124 | { | |
125 | error: err || new Error('Status code not 20x : ' + res.statusCode) | |
126 | } | |
127 | ) | |
128 | ||
129 | return callback(false) | |
130 | } | |
131 | ||
132 | return callback(true) | |
133 | }) | |
134 | } | |
135 | ||
136 | // Make all the requests of the scheduler | |
137 | function makeRequests () { | |
138 | const self = this | |
139 | const RequestToPod = this.sequelize.models.RequestToPod | |
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 (request) { | |
161 | request.Pods.forEach(function (toPod) { | |
162 | const hashKey = toPod.id + request.endpoint | |
163 | if (!requestsToMakeGrouped[hashKey]) { | |
164 | requestsToMakeGrouped[hashKey] = { | |
165 | toPodId: toPod.id, | |
166 | endpoint: request.endpoint, | |
167 | ids: [], // request ids, to delete them from the DB in the future | |
168 | datas: [] // requests data, | |
169 | } | |
170 | } | |
171 | ||
172 | requestsToMakeGrouped[hashKey].ids.push(request.id) | |
173 | requestsToMakeGrouped[hashKey].datas.push(request.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: SQL request inside a loop :/ | |
184 | self.sequelize.models.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 | RequestToPod.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 pod %s.', requestToMake.toPodId, { requestsIds: requestToMake.ids }) | |
202 | ||
203 | goodPods.push(requestToMake.toPodId) | |
204 | ||
205 | // Remove the pod id of these request ids | |
206 | RequestToPod.removePodOf(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.call(self, goodPods, badPods) | |
216 | // Flush requests with no pod | |
217 | removeWithEmptyTo.call(self, function (err) { | |
218 | if (err) logger.error('Error when removing requests with no pods.', { error: err }) | |
219 | }) | |
220 | }) | |
221 | }) | |
222 | } | |
223 | ||
224 | // Remove pods with a score of 0 (too many requests where they were unreachable) | |
225 | function removeBadPods () { | |
226 | const self = this | |
227 | ||
228 | waterfall([ | |
229 | function findBadPods (callback) { | |
230 | self.sequelize.models.Pod.listBadPods(function (err, pods) { | |
231 | if (err) { | |
232 | logger.error('Cannot find bad pods.', { error: err }) | |
233 | return callback(err) | |
234 | } | |
235 | ||
236 | return callback(null, pods) | |
237 | }) | |
238 | }, | |
239 | ||
240 | function removeTheseBadPods (pods, callback) { | |
241 | each(pods, function (pod, callbackEach) { | |
242 | pod.destroy().asCallback(callbackEach) | |
243 | }, function (err) { | |
244 | return callback(err, pods.length) | |
245 | }) | |
246 | } | |
247 | ], function (err, numberOfPodsRemoved) { | |
248 | if (err) { | |
249 | logger.error('Cannot remove bad pods.', { error: err }) | |
250 | } else if (numberOfPodsRemoved) { | |
251 | logger.info('Removed %d pods.', numberOfPodsRemoved) | |
252 | } else { | |
253 | logger.info('No need to remove bad pods.') | |
254 | } | |
255 | }) | |
256 | } | |
257 | ||
258 | function updatePodsScore (goodPods, badPods) { | |
259 | const self = this | |
260 | const Pod = this.sequelize.models.Pod | |
261 | ||
262 | logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length) | |
263 | ||
264 | if (goodPods.length !== 0) { | |
265 | Pod.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) { | |
266 | if (err) logger.error('Cannot increment scores of good pods.', { error: err }) | |
267 | }) | |
268 | } | |
269 | ||
270 | if (badPods.length !== 0) { | |
271 | Pod.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) { | |
272 | if (err) logger.error('Cannot decrement scores of bad pods.', { error: err }) | |
273 | removeBadPods.call(self) | |
274 | }) | |
275 | } | |
276 | } | |
277 | ||
278 | function listWithLimitAndRandom (limit, callback) { | |
279 | const self = this | |
280 | ||
281 | self.count().asCallback(function (err, count) { | |
282 | if (err) return callback(err) | |
283 | ||
284 | // Optimization... | |
285 | if (count === 0) return callback(null, []) | |
286 | ||
287 | let start = Math.floor(Math.random() * count) - limit | |
288 | if (start < 0) start = 0 | |
289 | ||
290 | const query = { | |
291 | order: [ | |
292 | [ 'id', 'ASC' ] | |
293 | ], | |
294 | offset: start, | |
295 | limit: limit, | |
296 | include: [ this.sequelize.models.Pod ] | |
297 | } | |
298 | ||
299 | self.findAll(query).asCallback(callback) | |
300 | }) | |
301 | } | |
302 | ||
303 | function removeAll (callback) { | |
304 | // Delete all requests | |
305 | this.truncate({ cascade: true }).asCallback(callback) | |
306 | } | |
307 | ||
308 | function removeWithEmptyTo (callback) { | |
309 | if (!callback) callback = function () {} | |
310 | ||
311 | const query = { | |
312 | where: { | |
313 | id: { | |
314 | $notIn: [ | |
315 | this.sequelize.literal('SELECT "requestId" FROM "RequestToPods"') | |
316 | ] | |
317 | } | |
318 | } | |
319 | } | |
320 | ||
321 | this.destroy(query).asCallback(callback) | |
322 | } |