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Project: Vcr 1.4.0

Publisher: VCR

EM HTTP Request

  • @exclude-jruby
  • @exclude-rbx

EM HTTP Request allows multiple simultaneous asynchronous requests.
(The other HTTP libraries are synchronous). The scenarios below
demonstrate how VCR can be used with asynchronous em-http requests.

Background
Given
a file named "vcr_setup.rb" with: 
require 'em-http-request'
require 'vcr_cucumber_helpers'

start_sinatra_app(:port => 7777) do
  %w[ foo bar bazz ].each_with_index do |path, index|
    get "/#{path}" do
      sleep index * 0.1 # ensure the async callbacks are invoked in order
      ARGV[0] + ' ' + path
    end
  end
end

require 'vcr'

VCR.config do |c|
  c.stub_with :webmock
  c.cassette_library_dir = 'cassettes'
end
Scenarios
multiple simultaneous HttpRequest objects
Given
a file named "make_requests.rb" with: 
require 'vcr_setup'

VCR.use_cassette('em_http', :record => :new_episodes) do
  EventMachine.run do
    http_array = %w[ foo bar bazz ].map do |p|
      EventMachine::HttpRequest.new("http://localhost:7777/#{p}").get
    end

    http_array.each do |http|
      http.callback do
        puts http.response

        if http_array.all? { |h| h.response.to_s != '' }
          EventMachine.stop
        end
      end
    end
  end
end
When
I run "ruby make_requests.rb Hello"
Then
the output should contain: 
Hello foo
Hello bar
Hello bazz
And
the file "cassettes/em_http.yml" should contain YAML like: 
--- 
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/foo
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "9"
    body: Hello foo
    http_version: "1.1"
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/bar
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "9"
    body: Hello bar
    http_version: "1.1"
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/bazz
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "10"
    body: Hello bazz
    http_version: "1.1"
When
I run "ruby make_requests.rb Goodbye"
Then
the output should contain: 
Hello foo
Hello bar
Hello bazz
MultiRequest
Given
a file named "make_requests.rb" with: 
require 'vcr_setup'

VCR.use_cassette('em_http', :record => :new_episodes) do
  EventMachine.run do
    multi = EventMachine::MultiRequest.new

    %w[ foo bar bazz ].each do |path|
      multi.add(EventMachine::HttpRequest.new("http://localhost:7777/#{path}").get)
    end

    multi.callback do
      multi.responses[:succeeded].each do |http|
        puts http.response
      end
      EventMachine.stop
    end
  end
end
When
I run "ruby make_requests.rb Hello"
Then
the output should contain: 
Hello foo
Hello bar
Hello bazz
And
the file "cassettes/em_http.yml" should contain YAML like: 
--- 
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/foo
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "9"
    body: Hello foo
    http_version: "1.1"
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/bar
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "9"
    body: Hello bar
    http_version: "1.1"
- !ruby/struct:VCR::HTTPInteraction 
  request: !ruby/struct:VCR::Request 
    method: :get
    uri: http://localhost:7777/bazz
    body: 
    headers: 
  response: !ruby/struct:VCR::Response 
    status: !ruby/struct:VCR::ResponseStatus 
      code: 200
      message: OK
    headers: 
      content-type: 
      - text/html;charset=utf-8
      content-length: 
      - "10"
    body: Hello bazz
    http_version: "1.1"
When
I run "ruby make_requests.rb Goodbye"
Then
the output should contain: 
Hello foo
Hello bar
Hello bazz

Last published over 5 years ago by myronmarston.