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import log from 'loglevel'
import util from 'util'
import chalk from 'chalk'
import prefix from 'loglevel-plugin-prefix'
import ansiStrip from 'strip-ansi'
prefix.reg(log)
const DEFAULT_LEVEL = 'trace'
const COLORS = {
error: 'red',
warn: 'yellow',
info: 'cyanBright',
debug: 'green',
trace: 'cyan'
}
const matches = {
COMMAND: 'COMMAND',
DATA: 'DATA',
RESULT: 'RESULT'
}
const SERIALIZERS = [{
/**
* display error stack
*/
matches: (err) => err instanceof Error,
serialize: (err) => err.stack
}, {
/**
* color commands blue
*/
matches: (log) => log === matches.COMMAND,
serialize: (log) => chalk.magenta(log)
}, {
/**
* color data yellow
*/
matches: (log) => log === matches.DATA,
serialize: (log) => chalk.yellow(log)
}, {
/**
* color result cyan
*/
matches: (log) => log === matches.RESULT,
serialize: (log) => chalk.cyan(log)
}]
const loggers = {}
let logLevelsConfig = {}
const logCache = new Set()
let logFile
const originalFactory = log.methodFactory
log.methodFactory = function (methodName, logLevel, loggerName) {
const rawMethod = originalFactory(methodName, logLevel, loggerName)
return (...args) => {
/**
* create logFile lazily
*/
if (!logFile && process.env.WDIO_LOG_PATH) {
logFile = fs.createWriteStream(process.env.WDIO_LOG_PATH)
}
/**
* split `prefixer: value` sting to `prefixer: ` and `value`
* so that SERIALIZERS can match certain string
*/
const match = Object.values(matches).filter(x => args[0].endsWith(`: ${x}`))[0]
if (match) {
const prefixStr = args.shift().slice(0, -match.length - 1)
args.unshift(prefixStr, match)
}
args = args.map((arg) => {
for (const s of SERIALIZERS) {
if (s.matches(arg)) {
return s.serialize(arg)
}
}
return arg
})
const logText = ansiStrip(`${util.format.apply(this, args)}\n`)
if (logFile && logFile.writable) {
/**
* empty logging cache if stuff got logged before
*/
if (logCache.size) {
logCache.forEach((log) => logFile.write(log))
logCache.clear()
}
return logFile.write(logText)
}
logCache.add(logText)
rawMethod(...args)
}
}
prefix.apply(log, {
template: '%t %l %n:',
timestampFormatter: (date) => chalk.gray(date.toISOString()),
levelFormatter: (level) => chalk[COLORS[level]](level.toUpperCase()),
nameFormatter: (name) => chalk.whiteBright(name)
})
export default function getLogger (name) {
/**
* check if logger was already initiated
*/
if (loggers[name]) {
return loggers[name]
}
let logLevel = process.env.WDIO_LOG_LEVEL || DEFAULT_LEVEL
const logLevelName = getLogLevelName(name)
if (logLevelsConfig[logLevelName]) {
logLevel = logLevelsConfig[logLevelName]
}
loggers[name] = log.getLogger(name)
loggers[name].setLevel(logLevel)
return loggers[name]
}
/**
* Wait for writable stream to be flushed.
* Calling this prevents part of the logs in the very env to be lost.
*/
getLogger.waitForBuffer = async () => new Promise(resolve => {
if (logFile && Array.isArray(logFile.writableBuffer) && logFile.writableBuffer.length !== 0) {
return setTimeout(async () => {
await getLogger.waitForBuffer(resolve)
resolve()
}, 20)
}
resolve(true)
})
getLogger.setLevel = (name, level) => loggers[name].setLevel(level)
getLogger.setLogLevelsConfig = (logLevels = {}, wdioLogLevel = DEFAULT_LEVEL) => {
/**
* set log level
*/
if (process.env.WDIO_LOG_LEVEL === undefined) {
process.env.WDIO_LOG_LEVEL = wdioLogLevel
}
logLevelsConfig = {}
/**
* build logLevelsConfig object
*/
Object.entries(logLevels).forEach(([logName, logLevel]) => {
const logLevelName = getLogLevelName(logName)
logLevelsConfig[logLevelName] = logLevel
})
/**
* set log level for each logger
*/
Object.keys(loggers).forEach(logName => {
const logLevelName = getLogLevelName(logName)
/**
* either apply log level from logLevels object or use global logLevel
*/
const logLevel = typeof logLevelsConfig[logLevelName] !== 'undefined' ? logLevelsConfig[logLevelName] : process.env.WDIO_LOG_LEVEL
loggers[logName].setLevel(logLevel)
})
}
const getLogLevelName = logName => logName.split(':').shift()
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