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writer.js
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writer.js
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/* jshint node: true */
'use strict';
var path = require('path');
var debug = require('debug')('attachmate');
var request = require('request');
var mime = require('mime');
var util = require('util');
var collect = require('fstream/lib/collect');
var reHiddenFile = /(^|\/)\./;
var reBackslash = /\\/g;
/**
## AttachmentWriter(props)
**/
function AttachmentWriter(props) {
if (! (this instanceof AttachmentWriter)) {
return new AttachmentWriter(props);
}
// ensure props have been defined
props = props || {};
// TODO: check the path property is a url
this.path = props.path;
this.includeHidden = props.includeHidden;
this.preserveExisting = typeof props.preserveExisting == 'undefined' ||
props.preserveExisting;
this.docData = props.docData || {};
this._activeEntry = null;
this._buffer = [];
this._newAttachments = {};
}
util.inherits(AttachmentWriter, require('fstream').Writer);
module.exports = AttachmentWriter;
/**
### add()
**/
AttachmentWriter.prototype.add = function(entry) {
collect(entry);
// console.log('adding: ' + entry.props.path);
this._buffer.push(entry);
this._process();
};
/**
### end()
**/
AttachmentWriter.prototype.end = function() {
var writer = this;
var putOpts;
debug('stream ended, uploading attachment');
// get the current version of the document from couch
debug('requesting current doc: ' + this.path);
request(this.path, function(err, res, body) {
if (! err) {
var currentDoc = {};
try {
currentDoc = JSON.parse(body);
// if the current doc has an error, then reset the current doc
if (currentDoc.error) {
debug('got error requesting current doc: ' + currentDoc.error);
currentDoc = {};
}
}
catch (e) {
writer.emit('error', 'Cannot parse existing doc');
}
if (currentDoc._rev) {
debug(writer.path + ' retrieved, current revision = ' +
currentDoc._rev);
}
// ensure the current doc has an attachments member
// if we have been told not to preserve attachments, though, then reset
currentDoc._attachments =
(writer.preserveExisting ?currentDoc._attachments : {}) || {};
// if we have doc data then update the document
for (var docKey in writer.docData) {
if (docKey && docKey[0] !== '_') {
currentDoc[docKey] = writer.docData[docKey];
}
}
// add the new attachments
for (var aKey in writer._newAttachments) {
currentDoc._attachments[aKey] = writer._newAttachments[aKey];
}
// if the current document does not have an id, then give it one
debug('putting document update @ ' + writer.path);
putOpts = {
url: writer.path,
method: 'PUT',
json: currentDoc
};
request(putOpts, function(err, res, body) {
// check if we have received a body error from the response
if (!err && typeof body == 'object' && body.error) {
err = body.error;
}
if (! err) {
debug('uploaded doc ' +
(typeof body == 'object' ? body.id + '/' + body.rev : ''));
writer.emit('end');
}
else {
debug('upload failed to url (' + writer.path + ' failed)', err);
writer.emit('error', err);
}
});
}
});
debug('ENDED');
};
/**
### _addAttachment(name, chunks, size)
**/
AttachmentWriter.prototype._addAttachment = function(name, chunks, size) {
// convert the buffer chunks to a single buffer
var buffer = new Buffer(size);
var lastIndex = 0;
debug('got buffer of size ' + size + ' for: ' + name);
// replace back slashes with forward slashes
// as loading in from windows tends to cause problems
name = name.replace(reBackslash, '/');
chunks.forEach(function(chunk) {
chunk.copy(buffer, lastIndex);
lastIndex += chunk.length;
});
this._newAttachments[name] = {
'content_type': mime.lookup(name),
data: buffer.toString('base64')
};
};
/**
### _process()
**/
AttachmentWriter.prototype._process = function() {
var entry;
var relPath;
var writer = this;
var entryDataSize = 0;
var entryChunks = [];
var canProcess;
// if we are already processing an entry, abort
if (this._activeEntry) {
return;
}
// grab the next entry
entry = this._activeEntry = this._buffer.shift();
// if we have no new entry to process, bail
if (! entry) {
return;
}
relPath = path.relative(entry.root.props.path, entry.props.path);
canProcess = relPath && entry.readable &&
(this.includeHidden || (! reHiddenFile.test(relPath)));
if (canProcess) {
debug('processing: ' + relPath);
entry.on('end', function() {
if (entryChunks.length > 0) {
writer._addAttachment(relPath, entryChunks, entryDataSize);
}
writer._activeEntry = null;
writer._process();
});
if (entry.props.Directory) {
entry.on('entry', function(childEntry) {
// console.log('child', childEntry);
writer.add(childEntry);
});
// clear the active entry flag
writer._activeEntry = null;
}
else {
// console.log('stream: ', entry._getStream());
entry.on('data', function(chunk) {
entryChunks[entryChunks.length] = chunk;
entryDataSize += chunk.length;
});
}
// entry.resume();
}
else {
this._activeEntry = null;
this._process();
}
entry.pipe();
};