source: trip-planner-front/node_modules/http-proxy-middleware/lib/logger.js@ 76712b2

Last change on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 3.4 KB
Line 
1var util = require('util')
2var _ = require('lodash')
3
4var loggerInstance
5
6var defaultProvider = {
7 log: console.log,
8 debug: console.log, // use .log(); since console does not have .debug()
9 info: console.info,
10 warn: console.warn,
11 error: console.error
12}
13
14// log level 'weight'
15var LEVELS = {
16 debug: 10,
17 info: 20,
18 warn: 30,
19 error: 50,
20 silent: 80
21}
22
23module.exports = {
24 // singleton
25 getInstance: function() {
26 if (!loggerInstance) {
27 loggerInstance = new Logger()
28 }
29
30 return loggerInstance
31 },
32 getArrow: getArrow
33}
34
35function Logger() {
36 var logLevel
37 var provider
38
39 var api = {
40 log: log,
41 debug: debug,
42 info: info,
43 warn: warn,
44 error: error,
45 setLevel: function(v) {
46 if (isValidLevel(v)) {
47 logLevel = v
48 }
49 },
50 setProvider: function(fn) {
51 if (fn && isValidProvider(fn)) {
52 provider = fn(defaultProvider)
53 }
54 }
55 }
56
57 init()
58
59 return api
60
61 function init() {
62 api.setLevel('info')
63 api.setProvider(function() {
64 return defaultProvider
65 })
66 }
67
68 // log will log messages, regardless of logLevels
69 function log() {
70 provider.log(_interpolate.apply(null, arguments))
71 }
72
73 function debug() {
74 if (_showLevel('debug')) {
75 provider.debug(_interpolate.apply(null, arguments))
76 }
77 }
78
79 function info() {
80 if (_showLevel('info')) {
81 provider.info(_interpolate.apply(null, arguments))
82 }
83 }
84
85 function warn() {
86 if (_showLevel('warn')) {
87 provider.warn(_interpolate.apply(null, arguments))
88 }
89 }
90
91 function error() {
92 if (_showLevel('error')) {
93 provider.error(_interpolate.apply(null, arguments))
94 }
95 }
96
97 /**
98 * Decide to log or not to log, based on the log levels 'weight'
99 * @param {String} showLevel [debug, info, warn, error, silent]
100 * @return {Boolean}
101 */
102 function _showLevel(showLevel) {
103 var result = false
104 var currentLogLevel = LEVELS[logLevel]
105
106 if (currentLogLevel && currentLogLevel <= LEVELS[showLevel]) {
107 result = true
108 }
109
110 return result
111 }
112
113 // make sure logged messages and its data are return interpolated
114 // make it possible for additional log data, such date/time or custom prefix.
115 function _interpolate() {
116 var fn = _.spread(util.format)
117 var result = fn(_.slice(arguments))
118
119 return result
120 }
121
122 function isValidProvider(fnProvider) {
123 var result = true
124
125 if (fnProvider && !_.isFunction(fnProvider)) {
126 throw new Error('[HPM] Log provider config error. Expecting a function.')
127 }
128
129 return result
130 }
131
132 function isValidLevel(levelName) {
133 var validLevels = _.keys(LEVELS)
134 var isValid = _.includes(validLevels, levelName)
135
136 if (!isValid) {
137 throw new Error('[HPM] Log level error. Invalid logLevel.')
138 }
139
140 return isValid
141 }
142}
143
144/**
145 * -> normal proxy
146 * => router
147 * ~> pathRewrite
148 * ≈> router + pathRewrite
149 *
150 * @param {String} originalPath
151 * @param {String} newPath
152 * @param {String} originalTarget
153 * @param {String} newTarget
154 * @return {String}
155 */
156function getArrow(originalPath, newPath, originalTarget, newTarget) {
157 var arrow = ['>']
158 var isNewTarget = originalTarget !== newTarget // router
159 var isNewPath = originalPath !== newPath // pathRewrite
160
161 if (isNewPath && !isNewTarget) {
162 arrow.unshift('~')
163 } else if (!isNewPath && isNewTarget) {
164 arrow.unshift('=')
165 } else if (isNewPath && isNewTarget) {
166 arrow.unshift('≈')
167 } else {
168 arrow.unshift('-')
169 }
170
171 return arrow.join('')
172}
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