Module: HttpSimulator

Defined in:
lib/http_sim.rb

Constant Summary collapse

@@pid = 
false
@@erb_files = 
{
  index: self.read_file('lib/index.html.erb'),
  request: self.read_file('lib/request.html.erb'),
  response: self.read_file('lib/response.html.erb')
}
@@endpoints = 
[]

Class Method Summary collapse

Class Method Details

.check_if_port_in_use(port) ⇒ Object 



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# File 'lib/http_sim.rb', line 97

def self.check_if_port_in_use(port)
  begin
    HTTParty.get("http://localhost:#{port}/")
    raise "Port #{port} already in use"
  rescue Errno::ECONNREFUSED
    # ignored
  end
end

.read_file(path) ⇒ Object 



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# File 'lib/http_sim.rb', line 29

def self.read_file(path)
  lines = []
  File.open(path, 'r') do |f|
    f.each_line do |line|
      lines.push line
    end
  end
  lines.join
end

.register_endpoint(method, path, default_response) ⇒ Object 



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# File 'lib/http_sim.rb', line 111

def self.register_endpoint(method, path, default_response)
  raise '/ is a reserved path' if path == '/'

  endpoint = Endpoint.new(method, path, default_response)
  @@endpoints.push endpoint

  case endpoint.method
    when 'GET'
      Sinatra::Base.get endpoint.path do
        endpoint.add_request request.body.read
        endpoint.default_response
      end
    when 'PUT'
      Sinatra::Base.put endpoint.path do
        endpoint.add_request request.body.read
        endpoint.default_response
      end
    when 'PATCH'
      Sinatra::Base.patch endpoint.path do
        endpoint.add_request request.body.read
        endpoint.default_response
      end
    when 'POST'
      Sinatra::Base.post endpoint.path do
        endpoint.add_request request.body.read
        endpoint.default_response
      end
    when 'DELETE'
      Sinatra::Base.delete endpoint.path do
        endpoint.add_request request.body.read
        endpoint.default_response
      end
  end

  Sinatra::Base.get "#{endpoint.path}/response" do
    ERB.new(@@erb_files[:response]).result binding
  end

  Sinatra::Base.put "#{endpoint.path}/response" do
    endpoint.response = request.body.read
  end

  Sinatra::Base.delete "#{endpoint.path}/response" do
    endpoint.response = endpoint.default_response
  end

  Sinatra::Base.get "#{endpoint.path}/requests" do
    @endpoint = endpoint
    ERB.new(@@erb_files[:request]).result binding
  end

  Sinatra::Base.delete "#{endpoint.path}/requests" do
    endpoint.requests = []
  end
end

.reset_endpoints ⇒ Object

TODO: Should this just be ‘reset’?



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# File 'lib/http_sim.rb', line 107

def self.reset_endpoints
  @@endpoints = []
end

.run!(port: 4567) ⇒ Object 



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# File 'lib/http_sim.rb', line 46

def self.run!(port: 4567)
  check_if_port_in_use(port)

  Sinatra::Base.get '/' do
    ERB.new(@@erb_files[:index]).result binding
  end

  Class.new(Sinatra::Base) {
    set :port, port
    set :logging, false

    include HttpSimulator
  }.run!
end

.run_daemon!(port: 4567, max_wait_seconds: 5, log_file: 'http_sim_log.log') ⇒ Object 



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# File 'lib/http_sim.rb', line 61

def self.run_daemon!(port: 4567, max_wait_seconds: 5, log_file: 'http_sim_log.log')
  @@pid = Process.fork do
    $stdout.reopen(log_file, 'w')
    $stdout.sync = true
    $stderr.reopen($stdout)
    run!(port: port)
  end

  wait_for_start(port, max_wait_seconds)

  at_exit do
    Process.kill 'SIGKILL', @@pid
  end

  @@pid
end

.stop_daemon! ⇒ Object 



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# File 'lib/http_sim.rb', line 78

def self.stop_daemon!
  Process.kill('SIGKILL', @@pid) if @@pid
end

.wait_for_start(port, max_wait_seconds) ⇒ Object 



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# File 'lib/http_sim.rb', line 82

def self.wait_for_start(port, max_wait_seconds)
  wait_count = 0
  while wait_count < max_wait_seconds * 4
    begin
      HTTParty.get("http://localhost:#{port}/")
      return
    rescue Errno::ECONNREFUSED
      wait_count += 1
      sleep 0.25
    end
  end

  raise "Simulators failed to start - timed out after #{max_wait_seconds} seconds!"
end