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import {EventEmitter} from 'events'; |
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import { StringDecoder } from 'string_decoder'; |
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// Max duration to batch session data before sending it to the renderer process.
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const BATCH_DURATION_MS = 16; |
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// Max size of a session data batch. Note that this value can be exceeded by ~4k
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// (chunk sizes seem to be 4k at the most)
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const BATCH_MAX_SIZE = 200 * 1024; |
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// Data coming from the pty is sent to the renderer process for further
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// vt parsing and rendering. This class batches data to minimize the number of
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// IPC calls. It also reduces GC pressure and CPU cost: each chunk is prefixed
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// with the window ID which is then stripped on the renderer process and this
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// overhead is reduced with batching.
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export class PluginEventDataBatcher extends EventEmitter { |
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uid: number; |
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decoder: StringDecoder; |
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data!: any[] |
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timeout!: NodeJS.Timeout | null; |
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constructor(uid: number) { |
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super(); |
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this.uid = uid; |
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this.decoder = new StringDecoder('utf8'); |
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this.reset(); |
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} |
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reset() { |
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this.data = []; |
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this.timeout = null; |
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} |
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write(key: string, ...payload: any): void { |
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if (this.data.length >= BATCH_MAX_SIZE) { |
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// We've reached the max batch size. Flush it and start another one
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if (this.timeout) { |
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clearTimeout(this.timeout); |
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this.timeout = null; |
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} |
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this.flush(); |
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} |
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this.data.push({ |
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key, |
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payload, |
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}); |
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console.log('data', this.data) |
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if (!this.timeout) { |
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this.timeout = setTimeout(() => this.flush(), BATCH_DURATION_MS); |
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} |
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} |
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flush() { |
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// Reset before emitting to allow for potential reentrancy
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const data = this.data; |
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this.reset(); |
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this.emit('flush', data); |
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} |
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} |
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