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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -8,4 +8,5 @@ local-production.yml | |
| .cache*/ | ||
| Dockerfile* | ||
| .dockerignore | ||
| diagnostics/ | ||
| .idea | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| const { Writable } = require('stream'); | ||
| const fs = require('fs-extra'); | ||
| const path = require('path'); | ||
| const uuid = require('uuid'); | ||
| const consts = require('../constants'); | ||
| const helpers = require('../helpers'); | ||
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|
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| const kRecordBufferSize = 1024 * 1024 * 10; | ||
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| class ClientStreamRecorder extends Writable { | ||
| constructor(options) { | ||
| super(options); | ||
| this._sessionId = options.sessionId || uuid.v4(); | ||
| this._saveDir = options.saveDir || '.'; | ||
| this._bufferSize = options.bufferSize || kRecordBufferSize; | ||
| this._bufferPos = 0; | ||
| this._isRecording = false; | ||
| this._buffer = Buffer.allocUnsafe(this._bufferSize); | ||
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| this.on('unpipe', () => { | ||
| this._finish_recording() | ||
| .then(() => this._flush_buffer()) | ||
| .then(() => this.emit('flushed')); | ||
| }); | ||
| } | ||
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| /** | ||
| * | ||
| * @returns {string} | ||
| */ | ||
| get dataPath() { | ||
| return path.join(this._saveDir, this._sessionId); | ||
| } | ||
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| _write(chunk, encoding, callback) { | ||
| this._record_chunk(chunk).then(() => { | ||
| callback(); | ||
| }); | ||
| } | ||
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| async _record_chunk(chunk) { | ||
| this._isRecording = true; | ||
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| let slice = chunk; | ||
| if(this._bufferPos + slice.length > this._bufferSize) { | ||
| slice = chunk.slice(0, this._bufferSize - this._bufferPos); | ||
| } | ||
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|
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| slice.copy(this._buffer, this._bufferPos, 0, slice.length); | ||
| this._bufferPos += slice.length; | ||
| if(this._bufferPos === this._bufferSize) { | ||
| await this._flush_buffer(); | ||
| } | ||
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| if(slice.length < chunk.length) { | ||
| await this._record_chunk(chunk.slice(slice.length)); | ||
| } | ||
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| this._isRecording = false; | ||
| this.emit('_record_chunk'); | ||
| } | ||
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| async _flush_buffer() { | ||
| await fs.ensureDir(this._saveDir); | ||
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| // Normalize the version size so it will be correctly parsed when streamed to a server. | ||
| let zeroPad = 0; | ||
| if(!await fs.pathExists(this.dataPath)) { | ||
| for (let i = consts.PROTOCOL_VERSION_MIN_SIZE; i <= consts.VERSION_SIZE; i++) { | ||
| zeroPad = consts.VERSION_SIZE - i; | ||
| if (helpers.readUInt32(this._buffer.slice(0, i)) === consts.PROTOCOL_VERSION) break; | ||
| } | ||
| } | ||
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| const fd = await fs.open(this.dataPath, 'a'); | ||
| if(zeroPad > 0) await fs.write(fd, Buffer.alloc(zeroPad, '0', 'ascii'), 0); | ||
| await fs.write(fd, this._buffer, 0, this._bufferPos); | ||
| await fs.close(fd); | ||
| this._bufferPos = 0; | ||
| } | ||
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| async _finish_recording() { | ||
| if(!this._isRecording) return; | ||
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| return new Promise(resolve => { | ||
| this.once('_record_chunk', () => resolve()); | ||
| }); | ||
| } | ||
| } | ||
|
|
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| module.exports = ClientStreamRecorder; |
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