-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
handler.rb
191 lines (164 loc) · 6.1 KB
/
handler.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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
60
61
62
63
64
65
66
67
68
69
70
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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
require 'net/https'
require 'openssl'
module Seahorse
module Client
# @api private
module NetHttp
# The default HTTP handler for Seahorse::Client. This is based on
# the Ruby's `Net::HTTP`.
class Handler < Client::Handler
# @api private
class TruncatedBodyError < IOError
def initialize(bytes_expected, bytes_received)
msg = "http response body truncated, expected #{bytes_expected} "
msg << "bytes, received #{bytes_received} bytes"
super(msg)
end
end
NETWORK_ERRORS = [
SocketError, EOFError, IOError, Timeout::Error,
Errno::ECONNABORTED, Errno::ECONNRESET, Errno::EPIPE,
Errno::EINVAL, Errno::ETIMEDOUT, OpenSSL::SSL::SSLError,
Errno::EHOSTUNREACH, Errno::ECONNREFUSED
]
# does not exist in Ruby 1.9.3
if OpenSSL::SSL.const_defined?(:SSLErrorWaitReadable)
NETWORK_ERRORS << OpenSSL::SSL::SSLErrorWaitReadable
end
# @api private
DNS_ERROR_MESSAGES = [
'getaddrinfo: nodename nor servname provided, or not known', # MacOS
'getaddrinfo: Name or service not known' # GNU
]
# Raised when a {Handler} cannot construct a `Net::HTTP::Request`
# from the given http verb.
class InvalidHttpVerbError < StandardError; end
# @param [RequestContext] context
# @return [Response]
def call(context)
transmit(context.config, context.http_request, context.http_response)
Response.new(context: context)
end
# @param [Configuration] config
# @return [ConnectionPool]
def pool_for(config)
ConnectionPool.for(pool_options(config))
end
private
def error_message(req, error)
if error.is_a?(SocketError) && DNS_ERROR_MESSAGES.include?(error.message)
host = req.endpoint.host
"unable to connect to `#{host}`; SocketError: #{error.message}"
else
error.message
end
end
# @param [Configuration] config
# @param [Http::Request] req
# @param [Http::Response] resp
# @return [void]
def transmit(config, req, resp)
session(config, req) do |http|
http.request(build_net_request(req)) do |net_resp|
status_code = net_resp.code.to_i
headers = extract_headers(net_resp)
bytes_received = 0
resp.signal_headers(status_code, headers)
net_resp.read_body do |chunk|
if bytes_received < resp.body.size
chunk_index = resp.body.size - bytes_received
next_chunk = chunk.byteslice(chunk_index..-1)
else
next_chunk = chunk
end
resp.signal_data(next_chunk) if next_chunk
bytes_received += chunk.bytesize
end
complete_response(req, resp, bytes_received)
end
end
rescue *NETWORK_ERRORS => error
# these are retryable
error = NetworkingError.new(error, error_message(req, error))
resp.signal_error(error)
rescue => error
# not retryable
resp.signal_error(error)
end
def complete_response(req, resp, bytes_received)
if should_verify_bytes?(req, resp)
verify_bytes_received(resp, bytes_received)
else
resp.signal_done
end
end
def should_verify_bytes?(req, resp)
req.http_method != 'HEAD' && resp.headers['content-length']
end
def verify_bytes_received(resp, bytes_received)
bytes_expected = resp.headers['content-length'].to_i
if bytes_expected == bytes_received
resp.signal_done
else
error = TruncatedBodyError.new(bytes_expected, bytes_received)
resp.signal_error(NetworkingError.new(error, error.message))
end
end
def session(config, req, &block)
pool_for(config).session_for(req.endpoint) do |http|
http.read_timeout = config.http_read_timeout
yield(http)
end
end
# Extracts the {ConnectionPool} configuration options.
# @param [Configuration] config
# @return [Hash]
def pool_options(config)
ConnectionPool::OPTIONS.keys.inject({}) do |opts,opt|
opts[opt] = config.send(opt)
opts
end
end
# Constructs and returns a Net::HTTP::Request object from
# a {Http::Request}.
# @param [Http::Request] request
# @return [Net::HTTP::Request]
def build_net_request(request)
request_class = net_http_request_class(request)
req = request_class.new(request.endpoint.request_uri, headers(request))
req.body_stream = request.body
req
end
# @param [Http::Request] request
# @raise [InvalidHttpVerbError]
# @return Returns a base `Net::HTTP::Request` class, e.g.,
# `Net::HTTP::Get`, `Net::HTTP::Post`, etc.
def net_http_request_class(request)
Net::HTTP.const_get(request.http_method.capitalize)
rescue NameError
msg = "`#{request.http_method}` is not a valid http verb"
raise InvalidHttpVerbError, msg
end
# @param [Http::Request] request
# @return [Hash] Returns a vanilla hash of headers to send with the
# HTTP request.
def headers(request)
# setting these to stop net/http from providing defaults
headers = { 'content-type' => '', 'accept-encoding' => '' }
request.headers.each_pair do |key, value|
headers[key] = value
end
headers
end
# @param [Net::HTTP::Response] response
# @return [Hash<String, String>]
def extract_headers(response)
response.to_hash.inject({}) do |headers, (k, v)|
headers[k] = v.first
headers
end
end
end
end
end
end