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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 {send, build, getBlock, decode, config} from "@onflow/fcl"
import {Logger, LOGGER_LEVELS} from "./logger"
import {getAvailablePorts} from "../utils"
const {spawn} = require("child_process")
const DEFAULT_HTTP_PORT = 8080
const DEFAULT_GRPC_PORT = 3569
const print = {
log: console.log,
service: console.log,
info: console.log,
error: console.error,
warn: console.warn,
}
/** Class representing emulator */
export class Emulator {
/**
* Create an emulator.
*/
constructor() {
this.initialized = false
this.logging = false
this.filters = []
this.logger = new Logger()
}
/**
* Set logging flag.
* @param {boolean} logging - whether logs shall be printed
*/
setLogging(logging) {
this.logging = logging
}
/**
* Log message with a specific type.
* @param {*} message - message to put into log output
* @param {"log"|"error"} type - type of the message to output
*/
log(message, type = "log") {
if (this.logging !== false) {
print[type](message)
}
}
/**
* Start emulator.
* @param {Object} options - Optional parameters to start emulator with
* @param {string} [options.flags] - Extra flags to supply to emulator
* @param {boolean} [options.logging] - Switch to enable/disable logging by default
* @param {number} [options.grpcPort] - Hardcoded GRPC port
* @param {number} [options.restPort] - Hardcoded REST/HTTP port
* @param {number} [options.adminPort] - Hardcoded admin port
* @returns Promise<*>
*/
async start(options = {}) {
// populate emulator ports with available ports
const ports = await getAvailablePorts(3)
const [grpcPort, restPort, adminPort] = ports
// override ports if specified in options
this.grpcPort = options.grpcPort || grpcPort
this.restPort = options.restPort || restPort
this.adminPort = options.adminPort || adminPort
// Support deprecated start call using static port
Iif (arguments.length > 1 || typeof arguments[0] === "number") {
console.warn(`Calling emulator.start with the port argument is now deprecated in favour of dynamically selected ports and will be removed in future versions of flow-js-testing.
Please refrain from supplying this argument, as using it may cause unintended consequences.
More info: https://github.com/onflow/flow-js-testing/blob/master/TRANSITIONS.md#0001-deprecate-emulatorstart-port-argument`)
;[this.adminPort, options = {}] = arguments
const offset = this.adminPort - DEFAULT_HTTP_PORT
this.grpcPort = DEFAULT_GRPC_PORT + offset
}
const {flags, logging = false, signatureCheck = false} = options
// config access node
config().put("accessNode.api", `http://localhost:${this.restPort}`)
this.logging = logging
this.process = spawn("flow", [
"emulator",
"--verbose",
`--log-format=JSON`,
`--rest-port=${this.restPort}`,
`--admin-port=${this.adminPort}`,
`--port=${this.grpcPort}`,
`--skip-version-check`,
signatureCheck ? "" : "--skip-tx-validation",
flags,
])
this.logger.setProcess(this.process)
// Listen to logger to display logs if enabled
this.logger.on("*", (level, msg) => {
if (!this.filters.includes(level)) return
this.log(`${level.toUpperCase()}: ${msg}`)
if (msg.includes("Starting") && msg.includes(this.adminPort)) {
this.log("EMULATOR IS UP! Listening for events!")
}
})
// Suppress logger warning while waiting for emulator
await config().put("logger.level", 0)
return new Promise((resolve, reject) => {
const cleanup = success => {
this.initialized = success
this.logger.removeListener(LOGGER_LEVELS.ERROR, listener)
clearInterval(internalId)
if (success) resolve(true)
else reject()
}
let internalId
const checkLiveness = async function () {
try {
await send(build([getBlock(false)])).then(decode)
// Enable logger after emulator has come online
await config().put("logger.level", 2)
cleanup(true)
} catch (err) {} // eslint-disable-line no-unused-vars, no-empty
}
internalId = setInterval(checkLiveness, 100)
const listener = msg => {
this.log(`EMULATOR ERROR: ${msg}`, "error")
cleanup(false)
}
this.logger.on(LOGGER_LEVELS.ERROR, listener)
this.process.on("close", code => {
Iif (this.filters.includes("service")) {
this.log(`EMULATOR: process exited with code ${code}`)
}
cleanup(false)
})
})
}
/**
* Clear all log filters.
* @returns void
**/
clearFilters() {
this.filters = []
}
/**
* Remove specific type of log filter.
* @param {(debug|info|warning)} type - type of message
* @returns void
**/
removeFilter(type) {
this.filters = this.filters.filter(item => item !== type)
}
/**
* Add log filter.
* @param {(debug|info|warning)} type type - type of message
* @returns void
**/
addFilter(type) {
if (!this.filters.includes(type)) {
this.filters.push(type)
}
}
/**
* Stop emulator.
* @returns Promise<*>
*/
async stop() {
// eslint-disable-next-line no-undef
return new Promise(resolve => {
this.process.kill()
setTimeout(() => {
this.initialized = false
resolve(false)
}, 50)
})
}
}
/** Singleton instance */
export default new Emulator()
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