@thingweb/node-red-node-wot/src/servients/servient-wrapper.ts

Web of Things nodes for Node-RED using node-wot

import { ExposedThing, Servient } from "@node-wot/core"
import { HttpServer } from "@node-wot/binding-http"
import { CoapServer } from "@node-wot/binding-coap"
import { WebSocketServer } from "@node-wot/binding-websockets"
import { MqttBrokerServer } from "@node-wot/binding-mqtt"

export default class ServientWrapper {
    private servient
    private wot
    private started = false
    private server
    private things: { [key: string]: ExposedThing } = {}
    public constructor(bindingType: string, config: any) {
        console.debug("[debug] servient constructor called. config: ", config)
        this.servient = new Servient()
        if (bindingType === "http") {
            this.server = new HttpServer(config)
        } else if (bindingType === "websocket") {
            this.server = new WebSocketServer(config)
        } else if (bindingType === "coap") {
            this.server = new CoapServer(config)
        } else if (bindingType === "mqtt") {
            this.server = new MqttBrokerServer(config)
        }
        this.servient.addServer(this.server)
    }

    public isRunning() {
        return this.started
    }

    public async startServient() {
        this.wot = await this.servient.start()
    }

    public async createThing(td) {
        const thing = await this.wot.produce(td)
        this.things[td.title] = thing
        return thing
    }

    public async exposeThing(thing: ExposedThing) {
        await thing.expose()
        this.started = true
        const td = thing.getThingDescription()
        console.debug("[debug] thing exposed.", td)
        return td
    }

    public getThing(thingName: string) {
        return this.things[thingName]
    }

    public addCredentials(title, credentials) {
        const thing = this.things[title]
        const td = thing.getThingDescription()
        this.servient.addCredentials({ [td.id]: credentials })
    }

    public async endServient() {
        if (this.server) {
            console.debug("[debug] endServient called.")
            for (const key in this.things) {
                await this.server.destroy(this.things[key].id)
            }
            console.debug("[debug] server destroyed.")
            await this.server.stop()
            console.debug("[debug] server stopped.")
            await this.servient.shutdown()
            console.debug("[debug] servient shutdown.")
        }
    }
}