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handler.rb
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handler.rb
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# frozen_string_literal: true
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} "\
"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,
Net::HTTPFatalError # for proxy connection failures
]
# 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|
# Monkey patch default content-type set by Net::HTTP
Thread.current[:net_http_skip_default_content_type] = true
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|
bytes_received += chunk.bytesize
resp.signal_data(chunk)
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)
ensure
# ensure we turn off monkey patch in case of error
Thread.current[:net_http_skip_default_content_type] = nil
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|
# Ruby 2.5, can disable retries for idempotent operations
# avoid patching for Ruby 2.5 for disable retry
http.max_retries = 0 if http.respond_to?(:max_retries)
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))
# Net::HTTP adds a default Content-Type when a body is present.
# Set the body stream when it has an unknown size or when it is > 0.
if !request.body.respond_to?(:size) ||
(request.body.respond_to?(:size) && request.body.size > 0)
req.body_stream = request.body
end
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)
# Net::HTTP adds a default header for accept-encoding (2.0.0+).
# Setting a default empty value defeats this.
#
# Removing this is necessary for most services to not break request
# signatures as well as dynamodb crc32 checks (these fail if the
# response is gzipped).
headers = { '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