Class: Curl::Multi

Inherits:
Object
  • Object
show all
Defined in:
lib/curl/multi.rb,
ext/curb_multi.c

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.Curl::Multi.default_timeout( = 4) ⇒ 4

Get the global default time out for all Curl::Multi Handles.

Returns:

  • (4) 


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# File 'ext/curb_multi.c', line 124

VALUE ruby_curl_multi_get_default_timeout(VALUE klass) {
  return INT2FIX(cCurlMutiDefaulttimeout);
}

.Curl::Multi.default_timeout( = 4) ⇒ 4

Set the global default time out for all Curl::Multi Handles. This value is used when libcurl cannot determine a timeout value when calling curl_multi_timeout.

Returns:

  • (4) 


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# File 'ext/curb_multi.c', line 112

VALUE ruby_curl_multi_set_default_timeout(VALUE klass, VALUE timeout) {
  cCurlMutiDefaulttimeout = FIX2LONG(timeout);
  return timeout;
}

.download(urls, easy_options = {}, multi_options = {}, download_paths = nil, &blk) ⇒ Object

call-seq:

Curl::Multi.download(){|c|}

will create 2 new files file1.txt and file2.txt

2 files will be opened, and remain open until the call completes

when using the :post or :put method, urls should be a hash, including the individual post fields per post



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# File 'lib/curl/multi.rb', line 183

def download(urls,easy_options={},multi_options={},download_paths=nil,&blk)
  errors = []
  procs = []
  files = []
  urls_with_config = []
  url_to_download_paths = {}

  urls.each_with_index do|urlcfg,i|
    if urlcfg.is_a?(Hash)
      url = url[:url]
    else
      url = urlcfg
    end

    if download_paths and download_paths[i]
      download_path = download_paths[i]
    else
      download_path = File.basename(url)
    end

    file = lambda do|dp|
      file = File.open(dp,"wb")
      procs << (lambda {|data| file.write data; data.size })
      files << file
      file
    end.call(download_path)

    if urlcfg.is_a?(Hash)
      urls_with_config << urlcfg.merge({:on_body => procs.last}.merge(easy_options))
    else
      urls_with_config << {:url => url, :on_body => procs.last, :method => :get}.merge(easy_options)
    end
    url_to_download_paths[url] = {:path => download_path, :file => file} # store for later
  end

  if blk
    # when injecting the block, ensure file is closed before yielding
    Curl::Multi.http(urls_with_config, multi_options) do |c,code,method|
      info = url_to_download_paths[c.url]
      begin
        file = info[:file]
        files.reject!{|f| f == file }
        file.close
      rescue => e
        errors << e
      end
      blk.call(c,info[:path])
    end
  else
    Curl::Multi.http(urls_with_config, multi_options)
  end

ensure
  files.each {|f|
    begin
      f.close
    rescue => e
      errors << e
    end
  }
  raise errors unless errors.empty?
end

.get(urls, easy_options = {}, multi_options = {}, &blk) ⇒ Object

call-seq:

Curl::Multi.get('url1','url2','url3','url4','url5', :follow_location => true) do|easy|
  easy
end

Blocking call to fetch multiple url’s in parallel.



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# File 'lib/curl/multi.rb', line 11

def get(urls, easy_options={}, multi_options={}, &blk)
  url_confs = []
  urls.each do|url|
    url_confs << {:url => url, :method => :get}.merge(easy_options)
  end
  self.http(url_confs, multi_options) {|c,code,method| blk.call(c) if blk }
end

.http(urls_with_config, multi_options = {}, &blk) ⇒ Object

call-seq:

Curl::Multi.http( [

{ :url => 'url1', :method => :post,
  :post_fields => {'field1' => 'value1', 'field2' => 'value2'} },
{ :url => 'url2', :method => :get,
  :follow_location => true, :max_redirects => 3 },
{ :url => 'url3', :method => :put, :put_data => File.open('file.txt','rb') },
{ :url => 'url4', :method => :head }

], => true)

Blocking call to issue multiple HTTP requests with varying verb’s.

urls_with_config: is a hash of url’s pointing to the easy handle options as well as the special option :method, that can by one of [:get, :post, :put, :delete, :head], when no verb is provided e.g. :method => nil -> GET is used multi_options: options for the multi handle blk: a callback, that yeilds when a handle is completed



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# File 'lib/curl/multi.rb', line 85

def http(urls_with_config, multi_options={}, &blk)
  m = Curl::Multi.new

  # maintain a sane number of easy handles
  multi_options[:max_connects] = max_connects = multi_options.key?(:max_connects) ? multi_options[:max_connects] : 10

  free_handles = [] # keep a list of free easy handles

  # configure the multi handle
  multi_options.each { |k,v| m.send("#{k}=", v) }
  callbacks = [:on_progress,:on_debug,:on_failure,:on_success,:on_body,:on_header]

  add_free_handle = proc do|conf, easy|
    c       = conf.dup # avoid being destructive to input
    url     = c.delete(:url)
    method  = c.delete(:method)
    headers = c.delete(:headers)

    easy    = Curl::Easy.new if easy.nil?

    easy.url = url

    # assign callbacks
    callbacks.each do |cb|
      cbproc = c.delete(cb)
      easy.send(cb,&cbproc) if cbproc
    end

    case method
    when :post
      fields = c.delete(:post_fields)
      # set the post post using the url fields
      easy.post_body = fields.map{|f,k| "#{easy.escape(f)}=#{easy.escape(k)}"}.join('&')
    when :put
      easy.put_data = c.delete(:put_data)
    when :head
      easy.head = true
    when :delete
      easy.delete = true
    when :get
    else
      # XXX: nil is treated like a GET
    end

    # headers is a special key
    headers.each {|k,v| easy.headers[k] = v } if headers
 
    #
    # use the remaining options as specific configuration to the easy handle
    # bad options should raise an undefined method error
    #
    c.each { |k,v| easy.send("#{k}=",v) }

    easy.on_complete {|curl,code|
      free_handles << curl
      blk.call(curl,code,method) if blk
    }
    m.add(easy)
  end

  max_connects.times do
    conf = urls_with_config.pop
    add_free_handle.call conf, nil
    break if urls_with_config.empty?
  end

  consume_free_handles = proc do
    # as we idle consume free handles
    if urls_with_config.size > 0 && free_handles.size > 0
      easy = free_handles.pop
      conf = urls_with_config.pop
      add_free_handle.call conf, easy
    end
  end

  if urls_with_config.empty?
    m.perform
  else
    until urls_with_config.empty?
      m.perform do
        consume_free_handles.call
      end
      consume_free_handles.call
    end
    free_handles = nil
  end
end

.Curl::Multi.new ⇒ #<Curl::Easy...>

Create a new Curl::Multi instance

Returns:



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# File 'ext/curb_multi.c', line 84

VALUE ruby_curl_multi_new(VALUE klass) {
  VALUE new_curlm;

  ruby_curl_multi *rbcm = ALLOC(ruby_curl_multi);

  rbcm->handle = curl_multi_init();
  if (!rbcm->handle) {
    rb_raise(mCurlErrFailedInit, "Failed to initialize multi handle");
  }

  rbcm->requests = rb_hash_new();

  rbcm->active = 0;
  rbcm->running = 0;

  new_curlm = Data_Wrap_Struct(klass, curl_multi_mark, curl_multi_free, rbcm);

  return new_curlm;
}

.post(urls_with_config, easy_options = {}, multi_options = {}, &blk) ⇒ Object

call-seq:

Curl::Multi.post([{:url => 'url1', :post_fields => {'field1' => 'value1', 'field2' => 'value2'}},
                  {:url => 'url2', :post_fields => {'field1' => 'value1', 'field2' => 'value2'}},
                  {:url => 'url3', :post_fields => {'field1' => 'value1', 'field2' => 'value2'}}],
                 { :follow_location => true, :multipart_form_post => true },
                 {:pipeline => true }) do|easy|
  easy_handle_on_request_complete
end

Blocking call to POST multiple form’s in parallel.

urls_with_config: is a hash of url’s pointing to the postfields to send easy_options: are a set of common options to set on all easy handles multi_options: options to set on the Curl::Multi handle



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# File 'lib/curl/multi.rb', line 35

def post(urls_with_config, easy_options={}, multi_options={}, &blk)
  url_confs = []
  urls_with_config.each do|uconf|
    url_confs << uconf.merge(:method => :post).merge(easy_options)
  end
  self.http(url_confs, multi_options) {|c,code,method| blk.call(c) }
end

.put(urls_with_config, easy_options = {}, multi_options = {}, &blk) ⇒ Object

call-seq:

Curl::Multi.put([{:url => 'url1', :put_data => "some message"},
                 {:url => 'url2', :put_data => IO.read('filepath')},
                 {:url => 'url3', :put_data => "maybe another string or socket?"],
                 {:follow_location => true},
                 {:pipeline => true }) do|easy|
  easy_handle_on_request_complete
end

Blocking call to POST multiple form’s in parallel.

urls_with_config: is a hash of url’s pointing to the postfields to send easy_options: are a set of common options to set on all easy handles multi_options: options to set on the Curl::Multi handle



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# File 'lib/curl/multi.rb', line 59

def put(urls_with_config, easy_options={}, multi_options={}, &blk)
  url_confs = []
  urls_with_config.each do|uconf|
    url_confs << uconf.merge(:method => :put).merge(easy_options)
  end
  self.http(url_confs, multi_options) {|c,code,method| blk.call(c) }
end

Instance Method Details

#add(easy) ⇒ Object

multi = Curl::Multi.new easy = Curl::Easy.new(‘url’)

multi.add(easy)

Add an easy handle to the multi stack



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# File 'ext/curb_multi.c', line 222

VALUE ruby_curl_multi_add(VALUE self, VALUE easy) {
  CURLMcode mcode;
  ruby_curl_easy *rbce;
  ruby_curl_multi *rbcm;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  Data_Get_Struct(easy, ruby_curl_easy, rbce);

  /* setup the easy handle */
  ruby_curl_easy_setup( rbce );

  mcode = curl_multi_add_handle(rbcm->handle, rbce->curl);
  if (mcode != CURLM_CALL_MULTI_PERFORM && mcode != CURLM_OK) {
    raise_curl_multi_error_exception(mcode);
  }

  rbcm->active++;

  /* Increase the running count, so that the perform loop keeps running.
   * If this number is not correct, the next call to curl_multi_perform will correct it. */
  rbcm->running++;

  rb_hash_aset( rbcm->requests, easy, easy );

  return self;
}

#cancel! ⇒ Object

Cancels all requests currently being made on this Curl::Multi handle.



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# File 'ext/curb_multi.c', line 311

static VALUE ruby_curl_multi_cancel(VALUE self) {
  ruby_curl_multi *rbcm;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  
  rb_hash_foreach( rbcm->requests, ruby_curl_multi_cancel_callback, (VALUE)rbcm );
  
  /* for chaining */
  return self;
}

#idle? ⇒ Boolean

Returns whether or not this Curl::Multi handle is processing any requests. E.g. this returns true when multi.requests.length == 0.

Returns:

  • (Boolean) 


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# File 'ext/curb_multi.c', line 162

static VALUE ruby_curl_multi_idle(VALUE self) {
  ruby_curl_multi *rbcm;
  
  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  
  if ( FIX2INT( rb_funcall(rbcm->requests, rb_intern("length"), 0) ) == 0 ) {
    return Qtrue;
  } else {
    return Qfalse;
  }
}

#max_connects=(count) ⇒ Object

multi = Curl::Multi.new multi.max_connects = 800

Set the max connections in the cache for a multi handle



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# File 'ext/curb_multi.c', line 181

static VALUE ruby_curl_multi_max_connects(VALUE self, VALUE count) {
#ifdef HAVE_CURLMOPT_MAXCONNECTS
  ruby_curl_multi *rbcm;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  curl_multi_setopt(rbcm->handle, CURLMOPT_MAXCONNECTS, NUM2INT(count));
#endif

  return count;
}

#perform(*args) ⇒ Object

multi = Curl::Multi.new easy1 = Curl::Easy.new(‘url’) easy2 = Curl::Easy.new(‘url’)

multi.add(easy1) multi.add(easy2)

multi.perform do

# while idle other code my execute here

end

Run multi handles, looping selecting when data can be transfered



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# File 'ext/curb_multi.c', line 503

VALUE ruby_curl_multi_perform(int argc, VALUE *argv, VALUE self) {
  CURLMcode mcode;
  ruby_curl_multi *rbcm;
  int maxfd, rc;
  fd_set fdread, fdwrite, fdexcep;
#ifdef _WIN32
  fd_set crt_fdread, crt_fdwrite, crt_fdexcep;
#endif
  long timeout_milliseconds;
  struct timeval tv = {0, 0};
  VALUE block = Qnil;
#ifdef HAVE_RB_THREAD_BLOCKING_REGION
  struct _select_set fdset_args;
#endif

  rb_scan_args(argc, argv, "0&", &block);

  Data_Get_Struct(self, ruby_curl_multi, rbcm);

  timeout_milliseconds = cCurlMutiDefaulttimeout;

  rb_curl_multi_run( self, rbcm->handle, &(rbcm->running) );
  rb_curl_multi_read_info( self, rbcm->handle );
  if (block != Qnil) { rb_funcall(block, rb_intern("call"), 1, self);  }
 
  do {
    while (rbcm->running) {

#ifdef HAVE_CURL_MULTI_TIMEOUT
      /* get the curl suggested time out */
      mcode = curl_multi_timeout(rbcm->handle, &timeout_milliseconds);
      if (mcode != CURLM_OK) {
        raise_curl_multi_error_exception(mcode);
      }
#else
      /* libcurl doesn't have a timeout method defined, initialize to -1 we'll pick up the default later */
      timeout_milliseconds = -1;
#endif

      if (timeout_milliseconds == 0) { /* no delay */
        rb_curl_multi_run( self, rbcm->handle, &(rbcm->running) );
        rb_curl_multi_read_info( self, rbcm->handle );
        if (block != Qnil) { rb_funcall(block, rb_intern("call"), 1, self);  }
        continue;
      }

      if (timeout_milliseconds < 0 || timeout_milliseconds > cCurlMutiDefaulttimeout) {
        timeout_milliseconds = cCurlMutiDefaulttimeout; /* libcurl doesn't know how long to wait, use a default timeout */
                                                        /* or buggy versions libcurl sometimes reports huge timeouts... let's cap it */
      }

      tv.tv_sec  = 0; /* never wait longer than 1 second */
      tv.tv_usec = (int)(timeout_milliseconds * 1000); /* XXX: int is the right type for OSX, what about linux? */

      FD_ZERO(&fdread);
      FD_ZERO(&fdwrite);
      FD_ZERO(&fdexcep);

      /* load the fd sets from the multi handle */
      mcode = curl_multi_fdset(rbcm->handle, &fdread, &fdwrite, &fdexcep, &maxfd);
      if (mcode != CURLM_OK) {
        raise_curl_multi_error_exception(mcode);
      }

#ifdef _WIN32
      create_crt_fd(&fdread, &crt_fdread);
      create_crt_fd(&fdwrite, &crt_fdwrite);
      create_crt_fd(&fdexcep, &crt_fdexcep);
#endif

#ifdef HAVE_RB_THREAD_BLOCKING_REGION
      fdset_args.maxfd = maxfd+1;
      fdset_args.fdread = &fdread;
      fdset_args.fdwrite = &fdwrite;
      fdset_args.fdexcep = &fdexcep;
      fdset_args.tv = &tv;
      rc = rb_thread_blocking_region(curb_select, &fdset_args, RUBY_UBF_IO, 0);
#else
      rc = rb_thread_select(maxfd+1, &fdread, &fdwrite, &fdexcep, &tv);
#endif

#ifdef _WIN32
      cleanup_crt_fd(&fdread, &crt_fdread);
      cleanup_crt_fd(&fdwrite, &crt_fdwrite);
      cleanup_crt_fd(&fdexcep, &crt_fdexcep);
#endif

      switch(rc) {
      case -1:
        rb_raise(rb_eRuntimeError, "select(): %s", strerror(errno));
        break;
      case 0: /* timeout */
      default: /* action */
        rb_curl_multi_run( self, rbcm->handle, &(rbcm->running) );
        rb_curl_multi_read_info( self, rbcm->handle );
        if (block != Qnil) { rb_funcall(block, rb_intern("call"), 1, self);  }
        break;
      }
    }

  } while( rbcm->running );

  rb_curl_multi_read_info( self, rbcm->handle );
  if (block != Qnil) { rb_funcall(block, rb_intern("call"), 1, self);  }
    
  return Qtrue;
}

#pipeline=(onoff) ⇒ Object

multi = Curl::Multi.new multi.pipeline = true

Pass a long set to 1 to enable or 0 to disable. Enabling pipelining on a multi handle will make it attempt to perform HTTP Pipelining as far as possible for transfers using this handle. This means that if you add a second request that can use an already existing connection, the second request will be “piped” on the same connection rather than being executed in parallel. (Added in 7.16.0)



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# File 'ext/curb_multi.c', line 203

static VALUE ruby_curl_multi_pipeline(VALUE self, VALUE onoff) {
#ifdef HAVE_CURLMOPT_PIPELINING
  ruby_curl_multi *rbcm;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  curl_multi_setopt(rbcm->handle, CURLMOPT_PIPELINING, onoff == Qtrue ? 1 : 0);
#endif
  return onoff;
}

#remove(easy) ⇒ Object

multi = Curl::Multi.new easy = Curl::Easy.new(‘url’)

multi.add(easy)

# sometime later multi.remove(easy)

Remove an easy handle from a multi stack.

Will raise an exception if the easy handle is not found



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# File 'ext/curb_multi.c', line 263

VALUE ruby_curl_multi_remove(VALUE self, VALUE easy) {
  ruby_curl_multi *rbcm;
  ruby_curl_easy *rbce;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);

  Data_Get_Struct(easy, ruby_curl_easy, rbce);

  rb_curl_multi_remove(rbcm,easy);

  return self;
}

#requests ⇒ Array

Returns an array containing all the active requests on this Curl::Multi object.

Returns:

  • (Array) 


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# File 'ext/curb_multi.c', line 141

static VALUE ruby_curl_multi_requests(VALUE self) {
  ruby_curl_multi *rbcm;
  VALUE result_array;

  Data_Get_Struct(self, ruby_curl_multi, rbcm);
  
  result_array = rb_ary_new();
  
  /* iterate over the requests hash, and stuff references into the array. */
  rb_hash_foreach(rbcm->requests, ruby_curl_multi_requests_callback, result_array);
  
  return result_array;
}