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69 lines (63 loc) · 1.89 KB
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import * as ds from "@devicescript/core"
import { Server, ServerOptions } from "./servercore"
const minInterval = 100
const maxInterval = 3600 * 1000
export interface SensorServerOptions extends ServerOptions {
interval?: number
}
export class SensorServer
extends Server
implements ds.SensorServerSpec
{
_preferredInterval: number
_streamingInterval: number
_streamingSamples = 0
_interval: number
constructor(
spec: ds.ServiceSpec,
options?: SensorServerOptions
) {
super(spec, options)
const interval = options?.interval || 500
this.set_streamingInterval(interval)
this._preferredInterval = this._streamingInterval
}
private maybeStop() {
if (this._streamingSamples <= 0) {
this._streamingSamples = 0
clearInterval(this._interval)
this._interval = 0
}
}
private async sendSample() {
const v = await (this as any).reading()
const p = this.spec.lookup("reading").encode(v)
await this._send(p)
this._streamingSamples--
this.maybeStop()
}
streamingSamples() {
return this._streamingSamples
}
async set_streamingSamples(value: number) {
this._streamingSamples = value
if (this._streamingSamples > 0 && !this._interval) {
this._interval = setInterval(
this.sendSample,
this._streamingInterval
)
await this.sendSample()
} else this.maybeStop()
}
streamingPreferredInterval() {
return this._preferredInterval
}
streamingInterval() {
return this._streamingInterval
}
set_streamingInterval(value: number) {
this._streamingInterval = Math.clamp(minInterval, value, maxInterval)
if (this._interval)
updateInterval(this._interval, this._streamingInterval)
}
}