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import {
NodePyATVDeviceOptions,
NodePyATVExecutableType,
NodePyATVInternalState,
NodePyATVListenerState,
NodePyATVState,
NodePyATVStateIndex
} from './types';
import {ChildProcess} from 'child_process';
import {EventEmitter} from 'events';
import NodePyATVDevice from './device';
import NodePyATVDeviceEvent from './device-event';
import {addRequestId, debug, execute, getParamters, parseState, removeRequestId} from './tools';
import {FakeChildProcess} from './fake-spawn';
/**
* @internal
*/
export default class NodePyATVDeviceEvents extends EventEmitter {
private readonly options: NodePyATVDeviceOptions;
private readonly state: NodePyATVState;
private readonly device: NodePyATVDevice;
private pyatv: ChildProcess | FakeChildProcess | undefined;
private timeout: NodeJS.Timeout | undefined;
private listenerState: NodePyATVListenerState;
constructor(state: NodePyATVState, device: NodePyATVDevice, options: NodePyATVDeviceOptions) {
super();
this.state = state;
this.device = device;
this.options = Object.assign({}, options);
this.listenerState = NodePyATVListenerState.stopped;
}
applyStateAndEmitEvents(newState: NodePyATVState): void {
Object.keys(this.state).forEach((key: string) => {
// @ts-ignore
const oldValue = this.state[key];
// @ts-ignore
const newValue = newState[key];
if(oldValue === undefined || newValue === undefined || oldValue === newValue) {
return;
}
const event = new NodePyATVDeviceEvent({
key: key as NodePyATVStateIndex,
old: oldValue,
new: newValue,
device: this.device
});
// @ts-ignore
this.state[key] = newState[key];
try {
this.emit('update:' + key, event);
this.emit('update', event);
}
catch(error) {
this.emit('error', error);
}
});
}
private parsePushUpdate(reqId: string, data: string): void {
let json: NodePyATVInternalState;
try {
json = JSON.parse(data);
}
catch(error) {
const msg = `Unable to parse stdout json: ${error}`;
debug(reqId, msg, this.options);
this.emit('error', new Error(msg));
return;
}
this.applyPushUpdate(json, reqId);
if(this.listenerState === NodePyATVListenerState.starting) {
this.listenerState = NodePyATVListenerState.started;
this.checkListener();
}
}
private applyPushUpdate(update: NodePyATVInternalState, reqId: string): void {
const newState = parseState(update, reqId, this.options);
this.applyStateAndEmitEvents(newState);
}
private checkListener(): void {
if(this.listenerState === NodePyATVListenerState.stopped && this.listenerCount() === 0 && this.timeout) {
clearTimeout(this.timeout);
this.timeout = undefined;
}
else if(this.listenerState === NodePyATVListenerState.stopped && this.listenerCount() > 0) {
const id = addRequestId();
debug(id, `Start listeing to events from device ${this.options.name}`, this.options);
this.startListening(id);
removeRequestId(id);
}
else if(
[NodePyATVListenerState.starting, NodePyATVListenerState.started].includes(this.listenerState) &&
this.listenerCount() === 0
) {
const id = addRequestId();
debug(id, `Stop listening to events from device ${this.options.name}`, this.options);
this.stopListening(id)
.catch(error => debug(id, `Unable to stop listeing: ${error}`, this.options))
.finally(() => removeRequestId(id));
}
}
private startListening(reqId: string): void {
Iif(this.listenerState !== NodePyATVListenerState.stopped) {
return;
}
this.listenerState = NodePyATVListenerState.starting;
const listenStart = new Date().getTime();
const parameters = getParamters(this.options);
this.pyatv = execute(reqId, NodePyATVExecutableType.atvscript, [...parameters, 'push_updates'], this.options);
const onError = (error: Error) => {
debug(reqId, `Got error from child process: ${error}`, this.options);
this.emit('error', error);
};
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const onStdErr = (data: any) => {
const error = new Error(`Got stderr output from pyatv: ${data}`);
debug(reqId, data.toString(), this.options);
this.emit('error', error);
};
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const onStdOut = (data: any) => {
String(data)
.split('\n')
.map(s => s.trim())
.filter(Boolean)
.forEach(s => this.parsePushUpdate(reqId, s));
};
const onClose = (code: number) => {
Iif(this.pyatv === undefined) {
// this should never happen… :/
return;
}
this.listenerState = NodePyATVListenerState.stopped;
debug(reqId, `Listening with atvscript exited with code ${code}`, this.options);
if(this.timeout !== undefined) {
clearTimeout(this.timeout);
this.timeout = undefined;
}
Eif (this.pyatv.stdout) {
this.pyatv.stdout.off('data', onStdOut);
}
Eif (this.pyatv.stderr) {
this.pyatv.stderr.off('data', onStdErr);
}
this.pyatv.off('error', onError);
this.pyatv.off('close', onClose);
if(this.listenerCount() > 0 && new Date().getTime() - listenStart < 30000) {
debug(reqId, `Wait 15s and restart listeing to events from device ${this.options.name}`, this.options);
this.timeout = setTimeout(() => {
this.checkListener();
}, 15000);
}
else Iif(this.listenerCount() > 0) {
debug(reqId, `Restart listeing to events from device ${this.options.name}`, this.options);
this.checkListener();
}
removeRequestId(reqId);
};
this.pyatv.on('error', onError);
this.pyatv.on('close', onClose);
Eif (this.pyatv.stdout) {
this.pyatv.stdout.on('data', onStdOut);
}
Eif (this.pyatv.stderr) {
this.pyatv.stderr.on('data', onStdErr);
}
}
protected async stopListening(reqId: string): Promise<void> {
Iif(
this.listenerState !== NodePyATVListenerState.starting &&
this.listenerState !== NodePyATVListenerState.started
) {
return;
}
this.listenerState = NodePyATVListenerState.stopping;
Iif(this.pyatv === undefined) {
throw new Error(
'Unable to stop listening due to internal error: state is stopping, but there\'s no child process. ' +
'This should never happen, please report this.'
);
}
Eif(this.pyatv.stdin) {
debug(reqId, 'Pressing enter to close atvscript…', this.options);
this.pyatv.stdin.write('\n');
await new Promise(cb => this.timeout = setTimeout(cb, 250));
}
if(this.listenerState === NodePyATVListenerState.stopping && this.pyatv) {
this.pyatv.kill();
}
this.listenerState = NodePyATVListenerState.stopped;
return;
}
addListener(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.addListener(event, listener);
this.checkListener();
return this;
}
on(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.on(event, listener);
this.checkListener();
return this;
}
once(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.once(event, (event: NodePyATVDeviceEvent) => {
listener(event);
setTimeout(() => this.checkListener(), 0);
});
this.checkListener();
return this;
}
prependListener(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.prependListener(event, listener);
this.checkListener();
return this;
}
off(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.off(event, listener);
this.checkListener();
return this;
}
removeAllListeners(event?: string | symbol): this {
super.removeAllListeners(event);
this.checkListener();
return this;
}
removeListener(event: string | symbol, listener: (event: NodePyATVDeviceEvent) => void): this {
super.removeListener(event, listener);
this.checkListener();
return this;
}
listenerCount(event?: string | symbol): number {
if(event !== undefined) {
return super.listenerCount(event);
}
return this.eventNames()
.map(event => this.listenerCount(event))
.reduce((a, b) => a + b, 0);
}
}
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