forked from tagkiller/express-gateway-plugin-statsd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
manifest.js
105 lines (97 loc) · 3.49 KB
/
manifest.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
// @ts-check
/// <reference path="./node_modules/express-gateway/index.d.ts" />
const SDC = require('@fiverr/statsd-client');
const logger = require('express-gateway/lib/logger').gateway;
function getDurationInMilliseconds(start) {
const NS_PER_SEC = 1e9
const NS_TO_MS = 1e6
const diff = process.hrtime(start)
return (diff[0] * NS_PER_SEC + diff[1]) / NS_TO_MS
}
const plugin = {
version: '1.0.0',
policies: ['statsd'],
init: pluginContext => {
pluginContext.registerPolicy({
name: 'statsd',
schema: {
$id: 'http://express-gateway.io/schemas/policies/statsd.json',
type: 'object',
properties: {
removeIdsRegex: {
type: 'string',
description: 'Regex to use to match ids to remove from the path tag',
default: '([0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12})|([0-9]+)',
},
removeIds: {
type: 'boolean',
description: 'Whether to remove Ids from the path that are sent to metrics or not (default: false)',
default: false,
},
statsdConfig: {
type: 'object',
properties: {
host: {
type: 'string',
description: 'Where to send the stats (default: localhost)',
default: 'localhost',
},
port: {
type: 'number',
description: 'The http port (default: 8125)',
default: 8125,
},
prefix: {
type: 'string',
description: 'Prefix all stats with this value (default "apigateway")',
default: 'apigateway',
},
scheme: {
type: 'string',
description: 'scheme to use to format the data (default: "datadog")',
default: 'datadog',
},
},
},
},
},
policy: (actionParams) => {
const removeIdsRegex = new RegExp(actionParams.removeIdsRegex, 'g');
const config = {
...actionParams.statsdConfig,
sanitise: string => `${string}`,
errorHandler: (error, data) => logger.error(`${error} - data : ${JSON.stringify(data)}`)
}
const sdc = new SDC(config);
function writePoint(start, req, res) {
const duration = getDurationInMilliseconds(start);
const path = actionParams.removeIds ? req.path.replace(removeIdsRegex, '_id_') : req.path;
sdc.time('request_duration', new Date(Date.now() - duration), {
tags: {
path: path,
method: req.method,
status_code: res.statusCode,
host: req.hostname,
service: 'apigateway',
},
});
};
// To avoid memory leak
function removeListeners(res) {
res.removeListener('finish', writePoint);
res.removeListener('error', removeListeners);
res.removeListener('close', removeListeners);
}
return (req, res, next) => {
const start = process.hrtime();
// Look at the following doc for the list of events : https://nodejs.org/api/http.html
res.once('finish', () => writePoint(start, req, res));
res.once('error', () => removeListeners(res));
res.once('close', () => removeListeners(res));
next();
}
},
});
}
};
module.exports = plugin;