Class: Excon::Connection

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

Constant Summary

Constants included from Utils

Utils::ESCAPED, Utils::UNESCAPED

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

#connection_uri, #escape_uri, #port_string, #query_string, #request_uri, #split_header_value, #unescape_form, #unescape_uri, #valid_connection_keys, #valid_request_keys

Constructor Details

#initialize(params = {}) ⇒ Connection

Initializes a new Connection instance

@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
  @option params [String] :socket The path to the unix socket (required for 'unix://' connections)
  @option params [String] :ciphers Only use the specified SSL/TLS cipher suites; use OpenSSL cipher spec format e.g. 'HIGH:!aNULL:!3DES' or 'AES256-SHA:DES-CBC3-SHA'
  @option params [String] :proxy Proxy server; e.g. 'http://myproxy.com:8888'
  @option params [Fixnum] :retry_limit Set how many times we'll retry a failed request.  (Default 4)
  @option params [Class] :instrumentor Responds to #instrument as in ActiveSupport::Notifications
  @option params [String] :instrumentor_name Name prefix for #instrument events.  Defaults to 'excon'



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# File 'lib/excon/connection.rb', line 49

def initialize(params = {})
  @data = Excon.defaults.dup
  # merge does not deep-dup, so make sure headers is not the original
  @data[:headers] = @data[:headers].dup

  # the same goes for :middlewares
  @data[:middlewares] = @data[:middlewares].dup

  params = validate_params(:connection, params)
  @data.merge!(params)

  unless @data[:scheme] == UNIX
    no_proxy_env = ENV["no_proxy"] || ENV["NO_PROXY"] || ""
    no_proxy_list = no_proxy_env.scan(/\*?\.?([^\s,:]+)(?::(\d+))?/i).map { |s| [s[0], s[1]] }
    unless no_proxy_list.index { |h| /(^|\.)#{h[0]}$/.match(@data[:host]) && (h[1].nil? || h[1].to_i == @data[:port]) }
      if @data[:scheme] == HTTPS && (ENV.has_key?('https_proxy') || ENV.has_key?('HTTPS_PROXY'))
        @data[:proxy] = setup_proxy(ENV['https_proxy'] || ENV['HTTPS_PROXY'])
      elsif (ENV.has_key?('http_proxy') || ENV.has_key?('HTTP_PROXY'))
        @data[:proxy] = setup_proxy(ENV['http_proxy'] || ENV['HTTP_PROXY'])
      elsif @data.has_key?(:proxy)
        @data[:proxy] = setup_proxy(@data[:proxy])
      end
    end
  end

  if @data[:proxy]
    @data[:headers]['Proxy-Connection'] ||= 'Keep-Alive'
    # https credentials happen in handshake
    if @data[:scheme] == 'http' && (@data[:proxy][:user] || @data[:proxy][:password])
      user, pass = Utils.unescape_form(@data[:proxy][:user].to_s), Utils.unescape_form(@data[:proxy][:password].to_s)
      auth = ['' << user.to_s << ':' << pass.to_s].pack('m').delete(Excon::CR_NL)
      @data[:headers]['Proxy-Authorization'] = 'Basic ' << auth
    end
  end

  if ENV.has_key?('EXCON_DEBUG') || ENV.has_key?('EXCON_STANDARD_INSTRUMENTOR')
    @data[:instrumentor] = Excon::StandardInstrumentor

    if ENV.has_key?('EXCON_DEBUG')
      @data[:debug_request] = @data[:debug_reponse] = true
    end
  end

  # Use Basic Auth if url contains a login
  if @data[:user] || @data[:password]
    user, pass = Utils.unescape_form(@data[:user].to_s), Utils.unescape_form(@data[:password].to_s)
    @data[:headers]['Authorization'] ||= 'Basic ' << ['' << user.to_s << ':' << pass.to_s].pack('m').delete(Excon::CR_NL)
  end

  @socket_key = '' << @data[:scheme]
  if @data[:scheme] == UNIX
    if @data[:host]
      raise ArgumentError, "The `:host` parameter should not be set for `unix://` connections.\n" +
                           "When supplying a `unix://` URI, it should start with `unix:/` or `unix:///`."
    elsif !@data[:socket]
      raise ArgumentError, 'You must provide a `:socket` for `unix://` connections'
    else
      @socket_key << '://' << @data[:socket]
    end
  else
    @socket_key << '://' << @data[:host] << port_string(@data)
  end
  reset
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/excon/connection.rb', line 5

def data
  @data
end

Instance Method Details

#connection ⇒ Object 



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# File 'lib/excon/connection.rb', line 7

def connection
  Excon.display_warning('Excon::Connection#connection is deprecated use Excon::Connection#data instead.')
  @data
end

#connection=(new_params) ⇒ Object 



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# File 'lib/excon/connection.rb', line 11

def connection=(new_params)
  Excon.display_warning('Excon::Connection#connection= is deprecated. Use of this method may cause unexpected results.')
  @data = new_params
end

#error_call(datum) ⇒ Object 



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# File 'lib/excon/connection.rb', line 114

def error_call(datum)
  if datum[:error]
    raise(datum[:error])
  end
end

#inspect ⇒ Object 



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# File 'lib/excon/connection.rb', line 348

def inspect
  vars = instance_variables.inject({}) do |accum, var|
    accum.merge!(var.to_sym => instance_variable_get(var))
  end
  if vars[:'@data'][:headers].has_key?('Authorization')
    vars[:'@data'] = vars[:'@data'].dup
    vars[:'@data'][:headers] = vars[:'@data'][:headers].dup
    vars[:'@data'][:headers]['Authorization'] = REDACTED
  end
  if vars[:'@data'][:password]
    vars[:'@data'] = vars[:'@data'].dup
    vars[:'@data'][:password] = REDACTED
  end
  inspection = '#<Excon::Connection:'
  inspection << (object_id << 1).to_s(16)
  vars.each do |key, value|
    inspection << ' ' << key.to_s << '=' << value.inspect
  end
  inspection << '>'
  inspection
end

#params ⇒ Object 



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# File 'lib/excon/connection.rb', line 16

def params
  Excon.display_warning('Excon::Connection#params is deprecated use Excon::Connection#data instead.')
  @data
end

#params=(new_params) ⇒ Object 



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# File 'lib/excon/connection.rb', line 20

def params=(new_params)
  Excon.display_warning('Excon::Connection#params= is deprecated. Use of this method may cause unexpected results.')
  @data = new_params
end

#proxy ⇒ Object 



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# File 'lib/excon/connection.rb', line 25

def proxy
  Excon.display_warning('Excon::Connection#proxy is deprecated use Excon::Connection#data[:proxy] instead.')
  @data[:proxy]
end

#proxy=(new_proxy) ⇒ Object 



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# File 'lib/excon/connection.rb', line 29

def proxy=(new_proxy)
  Excon.display_warning('Excon::Connection#proxy= is deprecated. Use of this method may cause unexpected results.')
  @data[:proxy] = new_proxy
end

#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] :path appears after 'scheme://host:port/'
  @option params [Hash]   :query appended to the 'scheme://host:port/path/' in the form of '?key=value'



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# File 'lib/excon/connection.rb', line 228

def request(params={}, &block)
  params = validate_params(:request, params)
  # @data has defaults, merge in new params to override
  datum = @data.merge(params)
  datum[:headers] = @data[:headers].merge(datum[:headers] || {})

  if datum[:scheme] == UNIX
    datum[:headers]['Host']   ||= '' << datum[:socket]
  else
    datum[:headers]['Host']   ||= '' << datum[:host] << port_string(datum)
  end
  datum[:retries_remaining] ||= datum[:retry_limit]

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

  if block_given?
    Excon.display_warning('Excon requests with a block are deprecated, pass :response_block instead.')
    datum[:response_block] = Proc.new
  end

  if datum[:idempotent]
    if datum[:request_block]
      Excon.display_warning('Excon requests with a :request_block can not be :idempotent.')
      datum[:idempotent] = false
    end
    if datum[:pipeline]
      Excon.display_warning("Excon requests can not be :idempotent when pipelining.")
      datum[:idempotent] = false
    end
  end

  datum[:connection] = self

  datum[:stack] = datum[:middlewares].map do |middleware|
    lambda {|stack| middleware.new(stack)}
  end.reverse.inject(self) do |middlewares, middleware|
    middleware.call(middlewares)
  end
  datum = datum[:stack].request_call(datum)

  unless datum[:pipeline]
    datum = response(datum)

    if datum[:persistent]
      if key = datum[:response][:headers].keys.detect {|k| k.casecmp('Connection') == 0 }
        if split_header_value(datum[:response][:headers][key]).any? {|t| t.casecmp('close') == 0 }
          reset
        end
      end
    else
      reset
    end

    Excon::Response.new(datum[:response])
  else
    datum
  end
rescue => error
  reset
  datum[:error] = error
  if datum[:stack]
    datum[:stack].error_call(datum)
  else
    raise error
  end
end

#request_call(datum) ⇒ Object 



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# File 'lib/excon/connection.rb', line 120

def request_call(datum)
  begin
    if datum.has_key?(:response)
      # we already have data from a middleware, so bail
      return datum
    else
      socket.data = datum
      # start with "METHOD /path"
      request = datum[:method].to_s.upcase << ' '
      if datum[:proxy]
        request << datum[:scheme] << '://' << datum[:host] << port_string(datum)
      end
      request << datum[:path]

      # add query to path, if there is one
      request << query_string(datum)

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

      if datum.has_key?(:request_block)
        datum[:headers]['Transfer-Encoding'] = 'chunked'
      else
        body = datum[:body].is_a?(String) ? StringIO.new(datum[:body]) : datum[:body]

        # The HTTP spec isn't clear on it, but specifically, GET requests don't usually send bodies;
        # if they don't, sending Content-Length:0 can cause issues.
        unless datum[:method].to_s.casecmp('GET') == 0 && body.nil?
          unless datum[:headers].has_key?('Content-Length')
            datum[:headers]['Content-Length'] = detect_content_length(body)
          end
        end
      end

      if datum[:response_block]
        datum[:headers]['TE'] = 'trailers'
      else
        datum[:headers]['TE'] = 'trailers, deflate, gzip'
      end
      datum[:headers]['Connection'] = datum[:persistent] ? 'TE' : 'TE, close'

      # add headers to request
      datum[:headers].each do |key, values|
        [values].flatten.each do |value|
          request << key.to_s << ': ' << value.to_s << CR_NL
        end
      end

      # add additional "\r\n" to indicate end of headers
      request << CR_NL
      socket.write(request) # write out request + headers

      if datum.has_key?(:request_block)
        while true # write out body with chunked encoding
          chunk = datum[:request_block].call
          if FORCE_ENC
            chunk.force_encoding('BINARY')
          end
          if chunk.length > 0
            socket.write(chunk.length.to_s(16) << CR_NL << chunk << CR_NL)
          else
            socket.write('0' << CR_NL << CR_NL)
            break
          end
        end
      elsif !body.nil? # write out body
        if body.respond_to?(:binmode)
          body.binmode
        end
        if body.respond_to?(:pos=)
          body.pos = 0
        end
        while chunk = body.read(datum[:chunk_size])
          socket.write(chunk)
        end
      end
    end
  rescue => error
    case error
    when Excon::Errors::StubNotFound, Excon::Errors::Timeout
      raise(error)
    else
      raise(Excon::Errors::SocketError.new(error))
    end
  end

  datum
end

#requests(pipeline_params) ⇒ Object

Sends the supplied requests to the destination host using pipelining.

@pipeline_params [Array<Hash>] pipeline_params An array of one or more optional params, override defaults set in Connection.new, see #request for details



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# File 'lib/excon/connection.rb', line 300

def requests(pipeline_params)
  pipeline_params.each {|params| params.merge!(:pipeline => true, :persistent => true) }
  pipeline_params.last.merge!(:persistent => @data[:persistent])

  responses = pipeline_params.map do |params|
    request(params)
  end.map do |datum|
    Excon::Response.new(response(datum)[:response])
  end

  if @data[:persistent]
    if key = responses.last[:headers].keys.detect {|k| k.casecmp('Connection') == 0 }
      if split_header_value(responses.last[:headers][key]).any? {|t| t.casecmp('close') == 0 }
        reset
      end
    end
  else
    reset
  end

  responses
end

#reset ⇒ Object 



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# File 'lib/excon/connection.rb', line 323

def reset
  if old_socket = sockets.delete(@socket_key)
    old_socket.close rescue nil
  end
end

#response_call(datum) ⇒ Object 



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# File 'lib/excon/connection.rb', line 209

def response_call(datum)
  if datum.has_key?(:response_block) && !datum[:response][:body].empty?
    response_body = datum[:response][:body].dup
    content_length = remaining = response_body.bytesize
    while remaining > 0
      datum[:response_block].call(response_body.slice!(0, [datum[:chunk_size], remaining].min), [remaining - datum[:chunk_size], 0].max, content_length)
      remaining -= datum[:chunk_size]
    end
  end
  datum
end

#retry_limit ⇒ Object 



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# File 'lib/excon/connection.rb', line 343

def retry_limit
  Excon.display_warning('Excon::Connection#retry_limit is deprecated, use Excon::Connection#data[:retry_limit].')
  @data[:retry_limit] ||= DEFAULT_RETRY_LIMIT
end

#retry_limit=(new_retry_limit) ⇒ Object 



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# File 'lib/excon/connection.rb', line 338

def retry_limit=(new_retry_limit)
  Excon.display_warning('Excon::Connection#retry_limit= is deprecated, pass :retry_limit to the initializer.')
  @data[:retry_limit] = new_retry_limit
end