Module: Dev::Consul

Defined in:
lib/dev/consul.rb,
lib/dev/consul/build.rb,
lib/dev/consul/version.rb

Overview

Helpers to fetch and run a development-instance of consul

Defined Under Namespace

Modules: Build

Constant Summary collapse

RELEASE = 
'3'.freeze
VERSION = 
'0.6.4'.freeze

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/dev/consul.rb', line 39

def output
  @output
end

Class Method Details

.architecture ⇒ Object 



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# File 'lib/dev/consul.rb', line 15

def architecture
  case RUBY_PLATFORM
  when /x86_64/ then 'amd64'
  when /amd64/ then 'amd64'
  when /386/ then '386'
  when /arm/ then 'arm'
  else raise NameError, "Unable to detect system architecture for #{RUBY_PLATFORM}"
  end
end

.bin ⇒ Object 



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# File 'lib/dev/consul.rb', line 35

def bin
  File.join(bindir, "consul_#{VERSION}_#{platform}_#{architecture}")
end

.bindir ⇒ Object 



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# File 'lib/dev/consul.rb', line 11

def bindir
  File.expand_path('../../bin', __dir__)
end

.block ⇒ Object 



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# File 'lib/dev/consul.rb', line 101

def block
  @thread.join unless @thread.nil?
end

.log(*message) ⇒ Object

Logging helper



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# File 'lib/dev/consul.rb', line 42

def log(*message)
  return unless output.is_a?(IO)

  output.write(message.join(' ') + "\n")
  output.flush
end

.platform ⇒ Object 



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# File 'lib/dev/consul.rb', line 25

def platform
  case RUBY_PLATFORM
  when /darwin/ then 'darwin'
  when /freebsd/ then 'freebsd'
  when /linux/ then 'linux'
  when /solaris/ then 'solaris'
  else raise NameError, "Unable to detect system platfrom for #{RUBY_PLATFORM}"
  end
end

.run(**options) ⇒ Object 



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# File 'lib/dev/consul.rb', line 49

def run(**options)
  @output = options.fetch(:output, $stdout)
  log "Starting #{bin}"


  ## Fork a child process for Consul from a thread
  @stopped = false
  @thread = Thread.new do
    IO.popen("#{bin} agent -dev -advertise=127.0.0.1", 'r+') do |io|
      Thread.current[:process] = io.pid
      log "Started #{bin} (#{io.pid})"

      ## Stream output
      loop do
        break if io.eof?
        chunk = io.readpartial(1024)

        next unless output.is_a?(IO)
        output.write(chunk)
        output.flush
      end
    end
  end

  self
end

.stop ⇒ Object 



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# File 'lib/dev/consul.rb', line 105

def stop
  unless @thread.nil?
    unless @thread[:process].nil?
      log "Stop #{bin} (#{@thread[:process]})"
      Process.kill('TERM', @thread[:process])
    end

    @thread.join
  end

  @thread = nil
  @stopped = true
end

.wait ⇒ Object 



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# File 'lib/dev/consul.rb', line 76

def wait
  ## Wait for the service to become ready
  loop do
    break if @stopped || @thread.nil? || !@thread.alive?

    leader =
      begin
        Net::HTTP.get('localhost', '/v1/status/leader', 8500)
      rescue Errno::ECONNREFUSED
        log 'Waiting for Consul HTTP API to be ready'
        sleep 1
        next
      end

    if leader == '""'
      log 'Waiting for RAFT to initialize'
      sleep 1
      next
    end

    log 'Consul HTTP API is ready!'
    break
  end
end