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Breaking: use classes, requiring
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,90 +1,84 @@ | ||
| 'use strict' | ||
|
|
||
| const Writable = require('readable-stream').Writable | ||
| const inherits = require('inherits') | ||
|
|
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| const defaultOptions = { type: 'put' } | ||
| class WriteStream extends Writable { | ||
| constructor (db, options) { | ||
| options = Object.assign({ type: 'put' }, options) | ||
|
|
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| function WriteStream (db, options) { | ||
| if (!(this instanceof WriteStream)) { | ||
| return new WriteStream(db, options) | ||
| } | ||
|
|
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| options = Object.assign({}, defaultOptions, options) | ||
|
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| Writable.call(this, { | ||
| objectMode: true, | ||
| highWaterMark: options.highWaterMark || 16 | ||
| }) | ||
| super({ | ||
| objectMode: true, | ||
| highWaterMark: options.highWaterMark || 16 | ||
| }) | ||
|
|
||
| this._options = options | ||
| this._db = db | ||
| this._buffer = [] | ||
| this._flushing = false | ||
| this._maxBufferLength = options.maxBufferLength || Infinity | ||
| this._options = options | ||
| this._db = db | ||
| this._buffer = [] | ||
| this._flushing = false | ||
| this._maxBufferLength = options.maxBufferLength || Infinity | ||
| this._flush = this._flush.bind(this) | ||
|
|
||
| this.on('finish', () => { | ||
| this.emit('close') | ||
| }) | ||
| } | ||
| this.on('finish', () => { | ||
| this.emit('close') | ||
| }) | ||
| } | ||
|
|
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| inherits(WriteStream, Writable) | ||
| _write (data, enc, next) { | ||
| if (this.destroyed) return | ||
|
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| WriteStream.prototype._write = function (data, enc, next) { | ||
| if (this.destroyed) return | ||
| if (!this._flushing) { | ||
| this._flushing = true | ||
| process.nextTick(this._flush) | ||
| } | ||
|
|
||
| if (!this._flushing) { | ||
| this._flushing = true | ||
| process.nextTick(() => { this._flush() }) | ||
| if (this._buffer.length >= this._maxBufferLength) { | ||
| this.once('_flush', (err) => { | ||
| if (err) return this.destroy(err) | ||
| this._write(data, enc, next) | ||
| }) | ||
| } else { | ||
| this._buffer.push(Object.assign({ type: this._options.type }, data)) | ||
| next() | ||
| } | ||
| } | ||
|
|
||
| if (this._buffer.length >= this._maxBufferLength) { | ||
| this.once('_flush', (err) => { | ||
| if (err) return this.destroy(err) | ||
| this._write(data, enc, next) | ||
| }) | ||
| } else { | ||
| this._buffer.push(Object.assign({ type: this._options.type }, data)) | ||
| next() | ||
| } | ||
| } | ||
| _flush () { | ||
| const buffer = this._buffer | ||
|
|
||
| WriteStream.prototype._flush = function () { | ||
| const buffer = this._buffer | ||
| if (this.destroyed) return | ||
|
|
||
| if (this.destroyed) return | ||
| this._buffer = [] | ||
| this._db.batch(buffer, (err) => { | ||
| this._flushing = false | ||
|
|
||
| this._buffer = [] | ||
| this._db.batch(buffer, (err) => { | ||
| this._flushing = false | ||
| if (!this.emit('_flush', err) && err) { | ||
| // There was no _flush listener. | ||
| this.destroy(err) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| if (!this.emit('_flush', err) && err) { | ||
| // There was no _flush listener. | ||
| this.destroy(err) | ||
| _final (cb) { | ||
| if (this._flushing) { | ||
| // Wait for scheduled or in-progress _flush() | ||
| this.once('_flush', (err) => { | ||
| if (err) return cb(err) | ||
|
|
||
| // There could be additional buffered writes | ||
| this._final(cb) | ||
| }) | ||
| } else if (this._buffer && this._buffer.length) { | ||
| this.once('_flush', cb) | ||
| this._flush() | ||
| } else { | ||
| cb() | ||
| } | ||
| }) | ||
| } | ||
|
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| WriteStream.prototype._final = function (cb) { | ||
| if (this._flushing) { | ||
| // Wait for scheduled or in-progress _flush() | ||
| this.once('_flush', (err) => { | ||
| if (err) return cb(err) | ||
|
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||
| // There could be additional buffered writes | ||
| this._final(cb) | ||
| }) | ||
| } else if (this._buffer && this._buffer.length) { | ||
| this.once('_flush', cb) | ||
| this._flush() | ||
| } else { | ||
| cb() | ||
| } | ||
| } | ||
|
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| WriteStream.prototype._destroy = function (err, cb) { | ||
| this._buffer = null | ||
| cb(err) | ||
| _destroy (err, cb) { | ||
| this._buffer = null | ||
| cb(err) | ||
| } | ||
| } | ||
|
|
||
| module.exports = WriteStream |
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