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112 lines
2.4 KiB
112 lines
2.4 KiB
6 years ago
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// A writer for when we don't know what kind of thing
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// the thing is. That is, it's not explicitly set,
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// so we're going to make it whatever the thing already
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// is, or "File"
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//
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// Until then, collect all events.
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module.exports = ProxyWriter
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var Writer = require('./writer.js')
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var getType = require('./get-type.js')
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var inherits = require('inherits')
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var collect = require('./collect.js')
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var fs = require('fs')
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inherits(ProxyWriter, Writer)
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function ProxyWriter (props) {
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var self = this
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if (!(self instanceof ProxyWriter)) {
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throw new Error('ProxyWriter must be called as constructor.')
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}
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self.props = props
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self._needDrain = false
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Writer.call(self, props)
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}
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ProxyWriter.prototype._stat = function () {
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var self = this
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var props = self.props
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// stat the thing to see what the proxy should be.
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var stat = props.follow ? 'stat' : 'lstat'
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fs[stat](props.path, function (er, current) {
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var type
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if (er || !current) {
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type = 'File'
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} else {
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type = getType(current)
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}
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props[type] = true
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props.type = self.type = type
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self._old = current
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self._addProxy(Writer(props, current))
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})
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}
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ProxyWriter.prototype._addProxy = function (proxy) {
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// console.error("~~ set proxy", this.path)
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var self = this
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if (self._proxy) {
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return self.error('proxy already set')
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}
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self._proxy = proxy
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;[
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'ready',
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'error',
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'close',
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'pipe',
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'drain',
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'warn'
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].forEach(function (ev) {
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proxy.on(ev, self.emit.bind(self, ev))
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})
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self.emit('proxy', proxy)
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var calls = self._buffer
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calls.forEach(function (c) {
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// console.error("~~ ~~ proxy buffered call", c[0], c[1])
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proxy[c[0]].apply(proxy, c[1])
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})
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self._buffer.length = 0
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if (self._needsDrain) self.emit('drain')
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}
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ProxyWriter.prototype.add = function (entry) {
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// console.error("~~ proxy add")
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collect(entry)
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if (!this._proxy) {
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this._buffer.push(['add', [entry]])
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this._needDrain = true
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return false
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}
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return this._proxy.add(entry)
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}
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ProxyWriter.prototype.write = function (c) {
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// console.error('~~ proxy write')
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if (!this._proxy) {
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this._buffer.push(['write', [c]])
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this._needDrain = true
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return false
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}
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return this._proxy.write(c)
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}
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ProxyWriter.prototype.end = function (c) {
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// console.error('~~ proxy end')
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if (!this._proxy) {
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this._buffer.push(['end', [c]])
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return false
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}
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return this._proxy.end(c)
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}
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