Sharp: Lack of pipe method?

[lenliu]

i installed sharp module based on the 'Read Me' document, simple test is ok, but i get the below error when excute my test code, lack of importing some other module?

My Ubuntu env(Ubuntu 14.04 LTS)

    uname -a
    Linux mao 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Test Code:

    var sharp = require('sharp');
    var http = require('http');
    require('stream');

    http.createServer(function(request, response) {
    response.writeHead(200, {'Content-Type': 'image/webp'});
    sharp('input.jpg').rotate().resize(200).webp().pipe(response);
    }).listen(8000);
    // Create HTTP server that always returns auto-rotated 'input.jpg',
    // resized to 200 pixels wide, in WebP format

The error log：

    sharp('input.jpg').rotate().resize(200).webp().pipe(response);
                                                     ^
    TypeError: Object [object Promise] has no method 'pipe'
            at Server.<anonymous> (/home/len/temp/nodejis/webp.js:10:50)
            at Server.emit (events.js:98:17)
            at HTTPParser.parser.onIncoming (http.js:2108:12)
            at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23)
            at Socket.socket.ondata (http.js:1966:22)
            at TCP.onread (net.js:527:27)
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_lookup: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
    (.:6385): GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed

[lenliu]

I read over the issue #30 a moment ago , so i think is it the problem of the sharp's version? Has not the pipe() method deployed to Ubuntu repository? i installed the sharp module using the command 'npm install sharp'

[lovell]

Stream support will be available in the forthcoming 0.6.0 version. The most recent version published to _npm_ is 0.5.2.

If you'd like to use the Stream API sooner, you can install this module from the Github master branch by using:

npm install lovell/sharp

or, in the dependencies section of package.json, use:

'sharp': 'lovell/sharp'

Hope this helps.

[lenliu]

Thanks, the test above is ok after reinstalling the sharp; but another problem when i replace input.jpg to stream, the HTTP request from browser can not return, the code is below:

var sharp = require('sharp');
var http = require('http');
var inputStream = http.get('http://i.ebayimg.com/00/s/MTYwMFgxNjAw/z/C~EAAOSw~CRToq89/$_58.JPG');
var transformer = sharp().resize(200);
http.createServer(function (req, res) {
  var outputStream = res;
  inputStream.pipe(transformer).pipe(outputStream); // coding according to the doc
}).listen(8000);

[lenliu]

I am newer in node dev area, before i writed a java library using im4java based on Graphicsmagick, and the function is similar to the Sharp but webp encode.

[lovell]

http.get() returns a request object rather than a Readable Stream response.

I recommend you use the request HTTP client.

You'll need to move inputStream and transformer inside the scope of the closure passed to createServer().

var request = require('request');
var sharp = require('sharp');

http.createServer(function (req, res) {
  var inputStream = request('http://i.ebayimg.com/00/s/MTYwMFgxNjAw/z/C~EAAOSw~CRToq89/$_58.JPG');
  var transformer = sharp().resize(200);
  inputStream.pipe(transformer).pipe(res);
}).listen(8000);

[lenliu]

Thanks @lovell ; It works!