const Message = require('primea-message') const BN = require('bn.js') 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.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 (portName, message) { this.ports.queue(portName, message) return this._startMessageLoop() } async initialize (message) { await this.run(message, 'initialize') return 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 the // update it if (message._fromTicks > this.ticks) { this.ticks = message._fromTicks this.hypervisor.scheduler.update(this) } // run the next message await this.run(message) } // no more messages; shut down this.hypervisor.scheduler.done(this.id) } } /** * 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 run (message, method = 'run') { let result const responsePort = message.responsePort delete message.responsePort this.ports.addReceivedPorts(message) if (message.constructor === DeleteMessage) { this.ports._delete(message.fromName) } else { try { result = await this.container[method](message) || {} } catch (e) { result = { exception: true, exceptionError: e } } } if (responsePort) { this.send(responsePort, new Message({ data: result })) } 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 } /** * creates a new container. Returning a port to it. * @param {String} type * @param {*} data - the data to populate the initail state with * @returns {Object} */ createInstance (type, message) { let nonce = this.state.nonce const id = { nonce: nonce, parent: this.id } // incerment the nonce nonce = new BN(nonce) nonce.iaddn(1) this.state.nonce = nonce.toArray() this.ports.removeSentPorts(message) return this.hypervisor.createInstance(type, message, id) } /** * sends a message to a given port * @param {Object} portRef - the port * @param {Message} message - the message */ send (port, message) { message._hops++ // set the port that the message came from message._fromTicks = this.ticks this.ports.removeSentPorts(message) // if (this.currentMessage !== message && !message.responsePort) { // this.currentMessage._addSubMessage(message) // } return this.hypervisor.send(port, message) } }