etcher-sdk
Version:
73 lines • 2.3 kB
JavaScript
;
/*
* Copyright 2018 balena.io
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Scanner = void 0;
const debug_1 = require("debug");
const events_1 = require("events");
const debug = (0, debug_1.default)('etcher-sdk:scanner');
class Scanner extends events_1.EventEmitter {
constructor(adapters) {
super();
this.adapters = adapters;
this.drives = new Set();
this.adapters.forEach((adapter) => {
adapter.on('attach', this.onAttach.bind(this));
adapter.on('detach', this.onDetach.bind(this));
adapter.on('error', this.emit.bind(this, 'error'));
});
}
onAttach(drive) {
this.drives.add(drive);
this.emit('attach', drive);
}
onDetach(drive) {
this.drives.delete(drive);
this.emit('detach', drive);
}
getBy(field, value) {
for (const drive of this.drives) {
if (drive[field] === value) {
return drive;
}
}
}
start() {
debug('start');
let notReady = this.adapters.length;
return new Promise((resolve) => {
this.adapters.forEach((adapter) => {
adapter.on('ready', () => {
notReady -= 1;
if (notReady === 0) {
this.emit('ready');
resolve();
}
});
adapter.start();
});
});
}
stop() {
debug('stop');
this.drives.clear();
this.adapters.forEach((adapter) => {
adapter.stop();
});
}
}
exports.Scanner = Scanner;
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