Class: Fluent::OsmocomSpectrumSenseInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_osmocom_spectrum_sense.rb

Constant Summary collapse

REG = 
/^(?<time>.+) center_freq (?<center_freq>\d+\.\d+) freq (?<freq>\d+\.\d+) power_db (?<power_db>-?\d+\.\d+) noise_floor_db (?<noise_floor_db>-?\d+\.\d+)$/

Instance Method Summary collapse

Constructor Details

#initialize ⇒ OsmocomSpectrumSenseInput

Returns a new instance of OsmocomSpectrumSenseInput.



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 10

def initialize
  super
end

Instance Method Details

#build_options ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 61

def build_options
  options = ""
  if @sample_rate
    options += " -s #{@sample_rate}"
  end
  if @dwell_delay
    options += " --dwell-delay=#{@dwell_delay}"
  end
  if @tune_delay
    options += " --tune-delay=#{@tune_delay}"
  end
  if @channel_bandwidth
    options += " -b #{@channel_bandwidth}"
  end

  options += " #{@minfreq} #{@maxfreq}"
  return options
end

#collect_osmocom_output(stdout) ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 81

def collect_osmocom_output(stdout)
  collected = []
  begin
    readlines_nonblock(stdout).each do |line|
      # XXX: parse here
      log.debug "line => '#{line}'"
      match = line.match(REG)
      next unless match
      obj = {
        :time => Time.parse(match[:time]),
        :center_freq => match[:center_freq].to_f,
        :freq => match[:freq].to_f,
        :power_db => match[:power_db].to_f,
        :noise_floor_db => match[:noise_floor_db].to_f,
      }
      log.debug "new osmocom_spectrum_sense input => #{obj}"
      collected << obj
    end
  rescue => e
    log.error "failed to read or parse line", :error => e.to_s,
      :error_class => e.class.to_s
  end

  collected.each do |obj|
    time = obj[:time].nil? ? Engine.now : Fluent::EventTime.from_time(obj[:time])
    obj.delete(:time) # including time could problem in some output plugin
    router.emit(@tag, time, obj)
  end
rescue => e
  log.error "failed to collect output from tshark",
    :error => e.to_s,
    :error_class => e.class.to_s
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 22

def configure(conf)
  super

  if !@minfreq.is_a?(Integer) or !@maxfreq.is_a?(Integer)
    raise ConfigError, "minfreq/maxfreq is required to be Integer"
  end
end

#readlines_nonblock(io) ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 115

def readlines_nonblock(io)
  @nbbuffer = "" if @nbbuffer == nil
  @nbbuffer += io.read_nonblock(65535)
  lines = []
  while idx = @nbbuffer.index("\n")
    lines << @nbbuffer[0..idx-1]
    @nbbuffer = @nbbuffer[idx+1..-1]
  end
  return lines
rescue
  return []
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 47

def run
  options = build_options
  cmdline = "osmocom_spectrum_sense #{options}"
  print cmdline + "\n"
  stdin, stdout, stderr, @th_osmocom = *Open3.popen3(cmdline)

  while @th_osmocom.alive?
    collect_osmocom_output(stdout)
  end
rescue => e
  log.error "unexpected error", :error => e.to_s
  log.error_backtrace e.backtrace
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 36

def shutdown
  if @th_osmocom and @th_osmocom.alive?
    Process.kill("INT", @th_osmocom.pid)
  end
  @thread.join
rescue => e
  log.error "osmocom_spectrum_sense failed to shutdown", :error => e.to_s,
    :error_class => e.class.to_s
  log.error_backtrace e.backtrace
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_osmocom_spectrum_sense.rb', line 30

def start
  super

  @thread = Thread.new(&method(:run))
end