Class: Probe

Inherits:
Object
  • Object
show all
Defined in:
lib/probe.rb

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ Probe

Returns a new instance of Probe.



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# File 'lib/probe.rb', line 9

def initialize(opts)
  @type = opts[:type].downcase
  @timeout = opts[:timeout] || 5
  @opts = opts
end

Instance Method Details

#command_probe ⇒ Object 



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# File 'lib/probe.rb', line 33

def command_probe
  cmd =  @opts[:command]
  run_as = @opts[:run_as]
  if run_as.nil? 
    run_as = 'nobody' if Process.uid.zero?
  else
    warn "WARNNG: Option 'run_as' requires root, ignoring it." unless Process.uid.zero? 
    run_as = nil unless Process.uid.zero? 
  end 

  Timeout::timeout(@timeout) do
    user = Etc.getpwnam(run_as) if run_as
    pid = Process.fork do
      STDOUT.reopen('/dev/null')
      STDERR.reopen('/dev/null')
      unless run_as.nil? 
        Process.egid = Process.gid = user.gid
        Process.euid = Process.uid = user.uid
      end
      exec cmd
    end
    status = Process.wait pid
    exit_status = $?.exitstatus 
    raise "Command [#{cmd}] exited with #{exit_status}" if exit_status > 0
  end
end

#error_wrapper(&block) ⇒ Object 



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# File 'lib/probe.rb', line 103

def error_wrapper(&block) 
  begin 
    instance_eval(&block) if block_given?
    raise 'block should be passed to error_wrapper' unless block_given?
  rescue => e 
    return "#{e.class} => #{e.message}"
  end
  "SUCCESS"
end

#http_probe ⇒ Object 



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# File 'lib/probe.rb', line 60

def http_probe
  url = @opts[:url]
  method = @opts[:method] || 'get'
  payload = @opts[:payload]  if @opts.key? :payload
  insecure = @opts[:insecure] || false
  headers = @opts[:headers] || {}

  Timeout::timeout(@timeout) do 
    uri = URI(url)
    is_https = uri.scheme == 'https'
    
    uri.path = '/' if uri.path.empty? 
    req = Object.const_get("Net::HTTP::#{method.capitalize}").new(uri.path)
    req.body = payload
     
    headers.each {|k,v| req[k] = v }
  
    opts = {}

    if is_https
      if @opts[:ca_file] 
        opts[:ca_file] = @opts[:ca_file]
      end
      
      if @opts[:cert_file] 
        opts[:cert] = OpenSSL::X509::Certificate.new( File.read @opts[:cert_file] )
      end

      if @opts[:key_file] 
        opts[:key] =  OpenSSL::PKey::RSA.new( File.read @opts[:key_file] )
      end
    end
 
    opts[:use_ssl] = is_https 
    opts[:verify_mode] = OpenSSL::SSL::VERIFY_NONE if is_https && insecure 
 
    Net::HTTP.start( uri.host, uri.port, opts ) do |http|
      res = http.request(req)
      raise "Request to #{url} returned code #{res.code}" unless res.code == '200'
    end
  end
end

#run ⇒ Object 



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# File 'lib/probe.rb', line 113

def run 
  case @type 
    when 'tcp'
      error_wrapper { tcp_probe }
    when 'udp'
      error_wrapper { udp_probe }
    when 'command'
      error_wrapper { command_probe }
    when 'http'
      error_wrapper { http_probe }
    else 
      raise "Type '#{@type}' not supported"
  end
end

#tcp_probe ⇒ Object 



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# File 'lib/probe.rb', line 15

def tcp_probe
  host = @opts[:host]
  port = @opts[:port] 
  Timeout::timeout(@timeout) do 
    TCPSocket.new(host, port).close
  end 
end

#udp_probe ⇒ Object 



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# File 'lib/probe.rb', line 23

def udp_probe
  host = @opts[:host]
  port = @opts[:port]
  Timeout::timeout(@timeout) do 
    u = UDPSocket.new
    u.connect(host,port)
    u.puts "check"
  end
end