aaac7fed
 liuqimichale
add
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// A writer for when we don't know what kind of thing
// the thing is. That is, it's not explicitly set,
// so we're going to make it whatever the thing already
// is, or "File"
//
// Until then, collect all events.
module.exports = ProxyWriter
var Writer = require('./writer.js')
var getType = require('./get-type.js')
var inherits = require('inherits')
var collect = require('./collect.js')
var fs = require('fs')
inherits(ProxyWriter, Writer)
function ProxyWriter (props) {
var self = this
if (!(self instanceof ProxyWriter)) {
throw new Error('ProxyWriter must be called as constructor.')
}
self.props = props
self._needDrain = false
Writer.call(self, props)
}
ProxyWriter.prototype._stat = function () {
var self = this
var props = self.props
// stat the thing to see what the proxy should be.
var stat = props.follow ? 'stat' : 'lstat'
fs[stat](props.path, function (er, current) {
var type
if (er || !current) {
type = 'File'
} else {
type = getType(current)
}
props[type] = true
props.type = self.type = type
self._old = current
self._addProxy(Writer(props, current))
})
}
ProxyWriter.prototype._addProxy = function (proxy) {
// console.error("~~ set proxy", this.path)
var self = this
if (self._proxy) {
return self.error('proxy already set')
}
self._proxy = proxy
;[
'ready',
'error',
'close',
'pipe',
'drain',
'warn'
].forEach(function (ev) {
proxy.on(ev, self.emit.bind(self, ev))
})
self.emit('proxy', proxy)
var calls = self._buffer
calls.forEach(function (c) {
// console.error("~~ ~~ proxy buffered call", c[0], c[1])
proxy[c[0]].apply(proxy, c[1])
})
self._buffer.length = 0
if (self._needsDrain) self.emit('drain')
}
ProxyWriter.prototype.add = function (entry) {
// console.error("~~ proxy add")
collect(entry)
if (!this._proxy) {
this._buffer.push(['add', [entry]])
this._needDrain = true
return false
}
return this._proxy.add(entry)
}
ProxyWriter.prototype.write = function (c) {
// console.error('~~ proxy write')
if (!this._proxy) {
this._buffer.push(['write', [c]])
this._needDrain = true
return false
}
return this._proxy.write(c)
}
ProxyWriter.prototype.end = function (c) {
// console.error('~~ proxy end')
if (!this._proxy) {
this._buffer.push(['end', [c]])
return false
}
return this._proxy.end(c)
}
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