Class: Excon::Connection

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

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
  @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'



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/excon/connection.rb', line 19

def initialize(url, params = {})
  uri = URI.parse(url)
  @connection = Excon.defaults.merge({
    :host              => uri.host,
    :path              => uri.path,
    :port              => uri.port.to_s,
    :query             => uri.query,
    :scheme            => uri.scheme,
  }).merge!(params)
  # merge does not deep-dup, so make sure headers is not the original
  @connection[:headers] = @connection[:headers].dup

  @proxy = nil

  # use proxy from the environment if present
  if ENV.has_key?('http_proxy')
    @proxy = setup_proxy(ENV['http_proxy'])
  elsif params.has_key?(:proxy)
    @proxy = setup_proxy(params[:proxy])
  end

  if @connection[:scheme] == HTTPS
    # use https_proxy if that has been specified
    if ENV.has_key?('https_proxy')
      @proxy = setup_proxy(ENV['https_proxy'])
    end
  end

  if @proxy
    @connection[:headers]['Proxy-Connection'] ||= 'Keep-Alive'
  end

  # Use Basic Auth if url contains a login
  if uri.user || uri.password
    auth = ["#{uri.user}:#{uri.password}"].pack('m').delete("\r\n")
    @connection[:headers]['Authorization'] ||= "Basic #{auth}"
  end

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

Instance Attribute Details

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



3
4
5
 
# File 'lib/excon/connection.rb', line 3

def connection
  @connection
end

#proxy ⇒ Object (readonly)

Returns the value of attribute proxy.



3
4
5
 
# File 'lib/excon/connection.rb', line 3

def proxy
  @proxy
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



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
# File 'lib/excon/connection.rb', line 71

def request(params, &block)
  # 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]

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

  if block_given?
    puts("Excon requests with a block are deprecated, pass :response_block instead (#{caller.first})")
    params[:response_block] = Proc.new
  end

  if params.has_key?(:instrumentor)
    if (retries_remaining ||= params[:retry_limit]) < params[:retry_limit]
      event_name = "#{params[:instrumentor_name]}.retry"
    else
      event_name = "#{params[:instrumentor_name]}.request"
    end
    params[:instrumentor].instrument(event_name, params) do
      request_kernel(params)
    end
  else
    request_kernel(params)
  end
rescue => request_error
  if params[:idempotent] && [Excon::Errors::SocketError,
      Excon::Errors::HTTPStatusError].any? {|ex| request_error.kind_of? ex }
    retries_remaining ||= params[:retry_limit]
    retries_remaining -= 1
    if retries_remaining > 0
      if params[:body].respond_to?(:pos=)
        params[:body].pos = 0
      end
      retry
    else
      if params.has_key?(:instrumentor)
        params[:instrumentor].instrument("#{params[:instrumentor_name]}.error", :error => request_error)
      end
      raise(request_error)
    end
  else
    if params.has_key?(:instrumentor)
      params[:instrumentor].instrument("#{params[:instrumentor_name]}.error", :error => request_error)
    end
    raise(request_error)
  end
end

#reset ⇒ Object 



123
124
125
 
# File 'lib/excon/connection.rb', line 123

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

#retry_limit ⇒ Object 



141
142
143
144
 
# File 'lib/excon/connection.rb', line 141

def retry_limit
  puts("Excon::Connection#retry_limit is deprecated, pass :retry_limit to the initializer (#{caller.first})")
  @connection[:retry_limit] ||= DEFAULT_RETRY_LIMIT
end

#retry_limit=(new_retry_limit) ⇒ Object 



136
137
138
139
 
# File 'lib/excon/connection.rb', line 136

def retry_limit=(new_retry_limit)
  puts("Excon::Connection#retry_limit= is deprecated, pass :retry_limit to the initializer (#{caller.first})")
  @connection[:retry_limit] = new_retry_limit
end