const Message = require('primea-message') const PortManager = require('./portManager.js') const DeleteMessage = require('./deleteMessage') module.exports = class Kernel { /** * the Kernel manages the varous message passing functions and provides * an interface for the containers to use * @param {Object} opts * @param {Object} opts.id - the UUID of the Kernel * @param {Object} opts.state - the state of the container * @param {Object} opts.hypervisor * @param {Object} opts.container - the container constuctor and argments */ constructor (opts) { this.state = opts.state this.code = opts.code this.hypervisor = opts.hypervisor this.id = opts.id this.container = new opts.container.Constructor(this, opts.container.args) this.ticks = 0 this.containerState = 'idle' // create the port manager this.ports = new PortManager(Object.assign({ kernel: this }, opts)) } /** * adds a message to this containers message queue * @param {string} portName * @param {object} message */ queue (port, message) { this.ports.queue(port.destName, message) this._startMessageLoop() } async create (message) { await this.message(message, 'onCreation') this._startMessageLoop() } // waits for the next message async _startMessageLoop () { // this ensure we only every have one loop running at a time if (this.containerState !== 'running') { this.containerState = 'running' while (1) { const message = await this.ports.getNextMessage() if (!message) break // dequqe message message.fromPort.messages.shift() // if the message we recived had more ticks then we currently have then // update it if (message._fromTicks > this.ticks) { this.ticks = message._fromTicks this.hypervisor.scheduler.update(this) } // run the next message await this.message(message) } this.containerState = 'idle' this.container.onIdle() } } shutdown () { this.hypervisor.scheduler.done(this.id) } startup () { return this.container.onStartup() } /** * run the kernels code with a given enviroment * @param {object} message - the message to run * @param {boolean} init - whether or not to run the intialization routine * @returns {Promise} */ async message (message, method = 'onMessage') { if (message.constructor === DeleteMessage) { this.ports._delete(message.fromName) } else { const responsePort = message.responsePort delete message.responsePort this.ports.addReceivedPorts(message) let result try { result = await this.container[method](message) } catch (e) { console.log(e) result = { exception: true, exceptionError: e } } if (responsePort) { this.send(responsePort, new Message({ data: result })) } await this.ports.clearUnboundedPorts() } } getResponsePort (message) { if (message.responsePort) { return message.responsePort.destPort } else { const [portRef1, portRef2] = this.ports.createChannel() message.responsePort = portRef2 this.ports._unboundPorts.delete(portRef2) return portRef1 } } /** * updates the number of ticks that the container has run * @param {Number} count - the number of ticks to add */ incrementTicks (count) { this.ticks += count this.hypervisor.scheduler.update(this) } /** * creates a new message * @param {*} data */ createMessage (opts) { const message = new Message(opts) this.ports.checkSendingPorts(message) return message } generateNextId () { const id = { nonce: this.state.nonce, parent: this.id } this.state.nonce++ return id } /** * sends a message to a given port * @param {Object} portRef - the port * @param {Message} message - the message */ send (port, message) { message._hops++ message._fromTicks = this.ticks message.fromId = this.id this.ports.removeSentPorts(message) return this.hypervisor.send(port, message) } }