audiobookshelf/server/Logger.js

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const { LogLevel } = require('./utils/constants')
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class Logger {
constructor() {
this.logLevel = process.env.NODE_ENV === 'production' ? LogLevel.INFO : LogLevel.TRACE
this.socketListeners = []
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}
get timestamp() {
return (new Date()).toISOString()
}
get levelString() {
for (const key in LogLevel) {
if (LogLevel[key] === this.logLevel) {
return key
}
}
return 'UNKNOWN'
}
getLogLevelString(level) {
for (const key in LogLevel) {
if (LogLevel[key] === level) {
return key
}
}
return 'UNKNOWN'
}
addSocketListener(socket, level) {
var index = this.socketListeners.findIndex(s => s.id === socket.id)
if (index >= 0) {
this.socketListeners.splice(index, 1, {
id: socket.id,
socket,
level
})
} else {
this.socketListeners.push({
id: socket.id,
socket,
level
})
}
}
removeSocketListener(socketId) {
this.socketListeners = this.socketListeners.filter(s => s.id !== socketId)
}
logToSockets(level, args) {
this.socketListeners.forEach((socketListener) => {
if (socketListener.level <= level) {
socketListener.socket.emit('log', {
timestamp: this.timestamp,
message: args.join(' '),
levelName: this.getLogLevelString(level),
level
})
}
})
}
setLogLevel(level) {
this.logLevel = level
this.debug(`Set Log Level to ${this.levelString}`)
}
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trace(...args) {
if (this.logLevel > LogLevel.TRACE) return
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console.trace(`[${this.timestamp}] TRACE:`, ...args)
this.logToSockets(LogLevel.TRACE, args)
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}
debug(...args) {
if (this.logLevel > LogLevel.DEBUG) return
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console.debug(`[${this.timestamp}] DEBUG:`, ...args)
this.logToSockets(LogLevel.DEBUG, args)
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}
info(...args) {
if (this.logLevel > LogLevel.INFO) return
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console.info(`[${this.timestamp}] INFO:`, ...args)
this.logToSockets(LogLevel.INFO, args)
}
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warn(...args) {
if (this.logLevel > LogLevel.WARN) return
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console.warn(`[${this.timestamp}] WARN:`, ...args)
this.logToSockets(LogLevel.WARN, args)
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}
error(...args) {
if (this.logLevel > LogLevel.ERROR) return
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console.error(`[${this.timestamp}] ERROR:`, ...args)
this.logToSockets(LogLevel.ERROR, args)
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}
fatal(...args) {
console.error(`[${this.timestamp}] FATAL:`, ...args)
this.logToSockets(LogLevel.FATAL, args)
}
note(...args) {
console.log(`[${this.timestamp}] NOTE:`, ...args)
this.logToSockets(LogLevel.NOTE, args)
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}
}
module.exports = new Logger()