Class: Excon::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/excon/connection.rb

Constant Summary collapse

CR_NL = 
"\r\n"
HTTP_1_1 = 
" HTTP/1.1\r\n"
FORCE_ENC = 
CR_NL.respond_to?(:force_encoding)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url, params = {}) ⇒ Connection

Initializes a new Connection instance

@param [String] url The destination URL
@param [Hash<Symbol, >] params One or more optional params
  @option params [String] :body Default text to be sent over a socket. Only used if :body absent in Connection#request params
  @option params [Hash<Symbol, String>] :headers The default headers to supply in a request. Only used if params[:headers] is not supplied to Connection#request
  @option params [String] :host The destination host's reachable DNS name or IP, in the form of a String
  @option params [String] :path Default path; appears after 'scheme://host:port/'. Only used if params[:path] is not supplied to Connection#request
  @option params [Fixnum] :port The port on which to connect, to the destination host
  @option params [Hash]   :query Default query; appended to the 'scheme://host:port/path/' in the form of '?key=value'. Will only be used if params[:query] is not supplied to Connection#request
  @option params [String] :scheme The protocol; 'https' causes OpenSSL to be used



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# File 'lib/excon/connection.rb', line 19

def initialize(url, params = {})
  uri = URI.parse(url)
  @connection = {
    :headers  => {},
    :host     => uri.host,
    :path     => uri.path,
    :port     => uri.port,
    :query    => uri.query,
    :scheme   => uri.scheme
  }.merge!(params)

  @socket_key = '' << @connection[:host] << ':' << @connection[:port].to_s
  reset
end

Instance Attribute Details

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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# File 'lib/excon/connection.rb', line 3

def connection
  @connection
end

Instance Method Details

#request(params, &block) ⇒ Object

Sends the supplied request to the destination host.

@yield [chunk] @see Response#self.parse
@param [Hash<Symbol, >] params One or more optional params, override defaults set in Connection.new
  @option params [String] :body text to be sent over a socket
  @option params [Hash<Symbol, String>] :headers The default headers to supply in a request
  @option params [String] :host The destination host's reachable DNS name or IP, in the form of a String
  @option params [String] :path appears after 'scheme://host:port/'
  @option params [Fixnum] :port The port on which to connect, to the destination host
  @option params [Hash]   :query appended to the 'scheme://host:port/path/' in the form of '?key=value'
  @option params [String] :scheme The protocol; 'https' causes OpenSSL to be used



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# File 'lib/excon/connection.rb', line 44

def request(params, &block)
  begin
    # connection has defaults, merge in new params to override
    params = @connection.merge(params)
    params[:headers] = @connection[:headers].merge(params[:headers] || {})
    params[:headers]['Host'] ||= '' << params[:host] << ':' << params[:port].to_s

    # if path is empty or doesn't start with '/', insert one
    unless params[:path][0, 1] == '/'
      params[:path].insert(0, '/')
    end

    # start with "METHOD /path"
    request = params[:method].to_s.upcase << ' ' << params[:path]

    # add query to path, if there is one
    case params[:query]
    when String
      request << '?' << params[:query]
    when Hash
      request << '?'
      for key, values in params[:query]
        case values
        when nil
          request << key.to_s << '&'
        when Array
          values.each do |value|
            request << key.to_s << '=' << CGI.escape(value.to_s) << '&'
          end
        else
          request << key.to_s << '=' << CGI.escape(values.to_s) << '&'
        end
      end
      request.chop! # remove trailing '&'
    end

    # finish first line with "HTTP/1.1\r\n"
    request << HTTP_1_1

    # calculate content length and set to handle non-ascii
    params[:headers]['Content-Length'] = case params[:body]
    when File
      params[:body].binmode
      File.size(params[:body])
    when String
      params[:body].force_encoding('BINARY') if FORCE_ENC
      params[:body].length
    else
      0
    end

    # add headers to request
    for key, values in params[:headers]
      for value in [*values]
        request << key.to_s << ': ' << value.to_s << CR_NL
      end
    end

    # add additional "\r\n" to indicate end of headers
    request << CR_NL

    # write out the request, sans body
    socket.write(request)

    # write out the body
    if params[:body]
      if params[:body].is_a?(String)
        socket.write(params[:body])
      else
        while chunk = params[:body].read(CHUNK_SIZE)
          socket.write(chunk)
        end
      end
    end

    # read the response
    response = Excon::Response.parse(socket, params, &block)

    if response.headers['Connection'] == 'close'
      reset
    end

    response
  rescue => socket_error
    reset
    raise(Excon::Errors::SocketError.new(socket_error))
  end

  if params.has_key?(:expects) && ![*params[:expects]].include?(response.status)
    reset
    raise(Excon::Errors.status_error(params, response))
  else
    response
  end

rescue => request_error
  if params[:idempotent] &&
      (request_error.is_a?(Excon::Errors::SocketError) ||
      (request_error.is_a?(Excon::Errors::HTTPStatusError) && response.status != 404))
    retries_remaining ||= 4
    retries_remaining -= 1
    if retries_remaining > 0
      retry
    else
      raise(request_error)
    end
  else
    raise(request_error)
  end
end

#reset ⇒ Object 



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# File 'lib/excon/connection.rb', line 155

def reset
  (old_socket = sockets.delete(@socket_key)) && old_socket.close
end