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* Flow JS Testing
*
* Copyright 2020-2021 Dapper Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {EventEmitter} from "events"
/**
* Enum of all logger levels
* @readonly
* @enum {number}
*/
export const LOGGER_LEVELS = {
PANIC: 5,
FATAL: 4,
ERROR: 3,
WARN: 2,
INFO: 1,
DEBUG: 0,
TRACE: -1,
}
// eslint-disable-next-line no-control-regex
const LOG_REGEXP = /LOG:.*?\s+(.*)/
export class Logger extends EventEmitter {
constructor(options) {
super(options)
this.handleMessage = this.handleMessage.bind(this)
this.process = null
this.setMaxListeners(100)
}
/**
* Sets the emulator process to monitor logs of
* @param {import("child_process").ChildProcessWithoutNullStreams} process
* @returns {void}
*/
setProcess(process) {
if (this.process) {
this.process.stdout.removeListener("data", this.handleMessage)
this.process.stderr.removeListener("data", this.handleMessage)
}
this.process = process
this.process.stdout.on("data", this.handleMessage)
this.process.stderr.on("data", this.handleMessage)
}
handleMessage(buffer) {
const logs = this.parseDataBuffer(buffer)
logs.forEach(({level, msg, ...data}) => {
// Handle log special case
const levelMatch =
level === LOGGER_LEVELS.INFO || level === LOGGER_LEVELS.DEBUG
const logMatch = LOG_REGEXP.test(msg)
if (levelMatch && logMatch) {
let logMessage = msg.match(LOG_REGEXP).at(1)
// if message is string, remove from surrounding and unescape
if (/^"(.*)"/.test(logMessage)) {
logMessage = logMessage
.substring(1, logMessage.length - 1)
.replace(/\\"/g, '"')
}
this.emit("log", logMessage)
}
// Emit emulator message to listeners
this.emit("message", {level, msg, ...data})
})
}
fixJSON(msg) {
// TODO: Test this functionality
const split = msg.split("\n").filter(item => item !== "")
return split.length > 1 ? `[${split.join(",")}]` : split[0]
}
parseDataBuffer(dataBuffer) {
const data = dataBuffer.toString()
try {
if (data.includes("msg")) {
let messages = JSON.parse(this.fixJSON(data))
// Make data into array if not array
messages = [].concat(messages)
// Map string levels to enum
messages = messages.map(m => ({
...m,
level: LOGGER_LEVELS[m.level.toUpperCase()],
}))
return messages
}
} catch (e) {
console.error(e)
}
return []
}
}
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