-
Notifications
You must be signed in to change notification settings - Fork 111
/
iso8583Queue.js
317 lines (248 loc) · 9.04 KB
/
iso8583Queue.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
var iso8583Packet = require('../../../lib/iso8583-packet');
var helpers = require('../../../lib/helpers');
var net = require('net');
var maxQueue = 100;
var queueTimeout = 35000;
var queueShortTimeout = 5000;
function queue(c) {
this.index = 1;
this.q = {};
this.busyTerminals = {};
if (c) {
maxQueue = c.maxQueue;
queueTimeout = c.queueTimeout * 1000;
queueShortTimeout = c.queueShortTimeout * 1000;
}
}
// Adds message to queue
queue.prototype.addMessage = function(sender, msg, params, errReturn) {
var isSystemSender = false;
if (!params) params = {};
var parentQueueItem = params.hasOwnProperty('parent') ? params['parent'] : null;
var delayTime = params.hasOwnProperty('delayTime') && params['delayTime'] ? params['delayTime'] : 0;
var comment = params.hasOwnProperty('comment') && params['comment'] ? params['comment'] : null;
if (!sender) {
throw new Error('Queue addMessage no sender');
}
if (this.getCount() >= maxQueue) {
throw new Error('Reached max queue length ');
}
if (typeof sender == 'object' && sender.constructor.name == 'Socket') {
var senderName = sender.name;
} else if (typeof sender == 'object' && sender.constructor.name == 'IncomingMessage') {
var senderName = sender.name;
} else if (typeof sender == 'object' && sender.constructor.name == 'Iso8583Logic') {
var senderName = sender.name;
isSystemSender = true;
}
var p = new iso8583Packet(msg);
if (!p.parseError && !p.checkErrors.length && !(p.isExpired && !isSystemSender)) {
dd('\n\n' + senderName + p.pretty(), 'verbose');
var stan = p.getField(11);
var terminalId = p.getField(41);
} else if (p.isExpired) {
dd((senderName + ': Warning! Iso8583 packet is expired. Won\'t queue!' + p.pretty()).red, 'verbose');
if (Array.isArray(errReturn)) errReturn.push('Packet is expired!');
return false;
} else if (p.parseError) {
dd((senderName + ': Warning! Failed to parse iso8583 packet. Won\'t queue!').red);
if (Array.isArray(errReturn)) errReturn.push('Failed to parse packet!');
return false;
} else {
dd((senderName + ': Warning! Iso8583 packet contains errors. Won\'t queue!' + p.pretty()).red, 'verbose');
if (Array.isArray(errReturn)) p.checkErrors.forEach(function(item) { errReturn.push(item); });
return false;
}
var item = {
id: this.index,
isProcessed: 0,
delayUntil: delayTime ? Date.now() + delayTime : 0,
createdAt: Date.now(),
retryCount: parentQueueItem && parentQueueItem.hasOwnProperty('retryCount') ? parentQueueItem['retryCount'] + 1 : 0,
stan: stan,
terminalId: terminalId,
messageTypeGroup: p.messageTypeGroup,
sender: sender,
senderName: senderName,
isSystemSender: isSystemSender,
packet: p,
comment: comment
};
var timeout = parentQueueItem ? queueShortTimeout : queueTimeout;
item.timeoutTimer = setTimeout(function() {
this.queueTimeout(item['id'])
}.bind(this), timeout + delayTime);
dd('Writing to queue ' + senderName + ' [' + this.getCount() + ']');
this.q[this.index] = item;
this.index++;
return item;
}
// Handles queue timeout
queue.prototype.queueTimeout = function(itemId) {
var item = this.getById(itemId);
dd(('Queue notice: ' + item.senderName + ' reached queue timeout').yellow);
if (item && !item.sender.isClosed()) {
dd('Dropping the client ' + item.senderName);
item.sender.queueTimeout();
} else {
this.confirm(itemId);
dd('The client ' + item.senderName + ' is already gone');
this.parent.socket.processQueue();
}
}
// Get queue item by id
queue.prototype.getById = function(id) {
return this.q.hasOwnProperty(id) ? this.q[id] : null;
}
// Returns messagess, ready to process
queue.prototype.fetchToProcess = function() {
result = [];
for (var i in this.q) {
var qe = this.q[i];
if (!qe.isProcessed && Date.now() >= qe.delayUntil && (!global.c['queueLockTerminal'] || !this.checkTerminalIsBusy(qe.terminalId))) {
qe.isProcessed = 1;
if (global.c['queueLockTerminal']) this.takeTerminal(qe.terminalId, qe['id']);
result.push(qe);
}
}
return result;
}
// Checks of currenlty there is no message with given terminal id in active state
queue.prototype.checkTerminalIsBusy = function(terminalId) {
return this.busyTerminals.hasOwnProperty(terminalId);
}
// Marks given terminal id as busy
queue.prototype.takeTerminal = function (terminalId, key) {
this.busyTerminals[terminalId] = key;
}
// Marks given terminal id as available
queue.prototype.releaseTerminal = function(terminalId, key) {
dd('Releasing terminal ' + terminalId + ' with the key ' + key, 'verbose');
// If terminal was takey by someone else -- do nothing
if (key && this.busyTerminals.hasOwnProperty(terminalId) && this.busyTerminals[terminalId] != key) {
dd('Terminal ' + terminalId + ' is assigned to key ' + this.busyTerminals[terminalId] + '. Nothing to do.', 'verbose');
return false;
} else if (!this.busyTerminals.hasOwnProperty(terminalId)) {
dd('Terminal ' + terminalId + ' is not assigned', 'verbose');
return false;
} else {
delete this.busyTerminals[terminalId];
return true;
}
}
queue.prototype.confirm = function(id) {
var item = this.getById(id);
if (item) {
var qe = {};
if (item.timeoutTimer) clearTimeout(item.timeoutTimer);
for (var key in item) qe[key] = item[key];
if (global.c['queueLockTerminal']) this.releaseTerminal(qe['terminalId'], qe['id']);
delete this.q[id];
return qe;
} else {
return null;
}
}
// Return the list of client currently waiting for result
queue.prototype.getActiveSenders = function() {
result = [];
for (var i in this.q) {
var qe = this.q[i];
if (qe.isProcessed) {
result.push(qe);
}
}
return result;
}
// Retrieves an item with corresponding stan and terminalId from the list of active items in queue
queue.prototype.getActiveByPacket = function(p) {
var pretenders = [];
for (var i in this.q) {
var qe = this.q[i];
var messageIdentified = true;
// Checking the key fields in the message queue
for (var i in global.c['queueMessageKeyFields']) {
var id = global.c['queueMessageKeyFields'][i];
if (!p.getField(id) || p.getField(id) != qe.packet.getField(id)) {
messageIdentified = false;
break;
}
}
if (messageIdentified && qe.isProcessed) {
// Not system senders does not care of original packet mti group
if (!qe.isSystemSender) {
pretenders.push(qe);
// System senders do care
} else if (qe.messageTypeGroup == p.messageTypeGroup) {
pretenders.push(qe);
}
}
}
// We have one correct sender -- good news
if (pretenders.length == 1) {
return pretenders[0];
// We have more than one senders, pretending to be the recipient -- need to solve problem
} else if (pretenders.length > 1) {
pretenders = this.solveConflict(p, pretenders);
if (pretenders[0]['score'] != pretenders[1]['score']) var solveResult = 'success'; else var solveResult = 'failed';
dd(('Queue warning: solving queue conflict with ' + pretenders.length + ' pretenders [' + solveResult + ']').red);
return pretenders[0]
// There is nobody to get the response
} else {
return null;
}
}
// Solves conflict and tries to return the most corresponding pretender
queue.prototype.solveConflict = function(p, pretenders) {
for (var i in pretenders) {
if (!pretenders[i].hasOwnProperty('score')) pretenders[i]['score'] = 0;
// Score by message type group
if (pretenders[i]['packet']['messageTypeGroup'] == p.messageTypeGroup) {
pretenders[i]['score'] += 10;
}
// Score by transaction amount
if (p.messageTypeGroup == 2) {
if (pretenders[i]['packet'].getField(4) == p.getField(4)) {
pretenders[i]['score'] += 1;
}
}
// Score by pan
if (pretenders[i]['packet']['messageTypeGroup'] == 2 && p.messageTypeId == '0210') {
var pan = p.getField(2);
var srcTrack = pretenders[i]['packet'].getField(35);
if (pan && srcTrack) {
var reg = new RegExp('^' + pan);
if (srcTrack.match(pan)) {
pretenders[i]['score'] += 5;
}
}
}
}
pretenders.sort(function (a, b) {
if (a.score > b.score) return -1;
if (a.score < b.score) return 1;
return 0;
});
return pretenders;
}
// Get total queue messages count
queue.prototype.getCount = function() {
return Object.keys(this.q).length;
}
// Check if the queue is empty
queue.prototype.isEmpty = function() {
return this.getCount() == 0;
}
// Returns queue keys
queue.prototype.getKeys = function() {
return Object.keys(this.q);
}
// Get pending messages count
queue.prototype.getPendingCount = function() {
cnt = 0;
for (var i in this.q) {
if (!this.q[i].isProcessed) cnt++;
}
return cnt;
}
module.exports = queue;