attachmate

Streamable CouchDB attachments

An experiment in using @isaacs useful fstream project to stream files in and out of CouchDB as attachments to documents.

Downloading From Couch to FileSystem

Example: Download Attachments to the Filesystem

var attachmate = require('attachmate');
var fstream = require('fstream');
var path = require('path');
var outputPath = path.resolve(__dirname, 'output');
var mkdirp = require('mkdirp');
 
mkdirp(outputPath, function(err) {
  if (err) return;
 
  var r = fstream.Reader({
    type: attachmate.Reader,
    path: 'http://localhost:5984/testdb/test'
  });
 
  var w = fstream.Writer({
    path: outputPath,
    type: 'Directory'
  });
 
  // pipe the attachments to the directory
  r.pipe(w);
});
 
 

Example: Download Attachments (using download helper)

var attachmate = require('attachmate');
var path = require('path');
var outputPath = path.resolve(__dirname, 'output');
var mkdirp = require('mkdirp');
 
mkdirp(outputPath, function(err) {
  if (err) return;
 
  attachmate.download(
    'http://localhost:5984/testdb/test',
    outputPath,
    function(err) {
      console.log('done, error = ', err);
    }
  );
});
 
 

Uploading from Filesystem to Couch

Options

The fstream classes take a set of options at initialization. In keeping with the fstream standard, we use the path option to denote the target document. The following additional options are also supported:

• preserveExisting - whether or not existing attachments on the document should be preserved. (default = true)

• includeHidden - whether or not hidden files should be included when uploading attachments to couch. (default = false)

Example: Upload Attachments from the Filesystem

var attachmate = require('attachmate');
var fstream = require('fstream');
var path = require('path');
 
var r = fstream.Reader({
  path: path.resolve(__dirname, 'input'),
  type: 'Directory'
});
 
var w = new attachmate.Writer({
  path: 'http://localhost:5984/testdb/test',
  includeHidden: false,
  preserveExisting: true
});
 
// pipe the attachments to the directory
r.pipe(w);

Example: Upload Attachments (using upload helper)

var attachmate = require('attachmate');
var path = require('path');
 
attachmate.upload(
  'http://localhost:5984/testdb/test',
  path.resolve(__dirname, 'input'),
  function(err) {
    console.log('done, error = ', err);
  }
);

Reference

AttachmentReader

_getEntries()

_read()

pause()

resume()

HttpRequestEntry(targetDoc, path)

_getStream()

_read()

pause()

resume()

AttachmentWriter(props)

add()

end()

_addAttachment(name, chunks, size)

_process()

License(s)

MIT

Copyright (c) 2017 Damon Oehlman damon.oehlman@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.