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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
require 'thread'
module AWS
module Core
module Http
# @api private
class CurbHandler
class NetworkError < StandardError; end
def initialize
@q = []
@sem = Mutex.new
@multi = Curl::Multi.new
start_processor
end
def handle request, response, &read_block
raise "unsupport http reqest method: #{request.http_method}" unless
['GET', 'HEAD', 'PUT', 'POST', 'DELETE'].include? request.http_method
@sem.synchronize do
@q << [request, response, read_block, Thread.current]
begin
@processor.wakeup
rescue ThreadError
start_processor
end
end
Thread.stop
nil
end
# fills the Curl::Multi handle with the given array of queue
# items, calling make_easy_handle on each one first
private
def fill_multi(items)
items.each do |item|
c = make_easy_handle(*item)
@multi.add(c)
end
end
# starts a background thread that waits for new items and
# sends them through the Curl::Multi handle
private
def start_processor
@processor = Thread.new do
loop do
items = nil
@sem.synchronize do
items = @q.slice!(0..-1)
end
unless items.empty?
fill_multi(items)
@multi.perform do
# curl is idle, so process more items if we can get them
# without blocking
if !@q.empty? && @sem.try_lock
begin
fill_multi(@q.slice!(0..-1))
ensure
@sem.unlock
end
end
end
end
# wait for a new item to show up before continuing
Thread.stop if @q.empty?
end
end
end
private
def make_easy_handle request, response, read_block, thread = nil
protocol = request.use_ssl? ? 'https' : 'http'
url = "#{protocol}://#{request.host}:#{request.port}#{request.uri}"
curl = Curl::Easy.new(url)
# curl.verbose = true
request.headers.each {|k, v| curl.headers[k] = v}
curl.on_header {|header_data|
if header_data =~ /:\s+/
name, value = header_data.strip.split(/:\s+/, 2)
response.headers[name] = value
end
header_data.length
}
case request.http_method
when 'GET'
# ....
when 'HEAD'
curl.head = true
when 'PUT'
curl.put_data = request.body || ''
when 'POST'
curl.headers['Content-Type'] = curl.headers['Content-Type'] || ''
curl.post_body = request.body || ''
when 'DELETE'
curl.delete = true
end
buffer = []
if read_block
curl.on_body do |chunk|
read_block.call(chunk)
chunk.size
end
else
curl.on_body do |chunk|
buffer << chunk
chunk.size
end
end
curl.on_complete do
response.status = curl.response_code
unless curl.response_code > 0
response.network_error = NetworkError.new('Empty response. Assume network error.')
end
unless read_block
response.body = buffer.join("")
end
thread.run if thread
end
curl
end
end
end
end
end
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