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February 27, 2020 01:45
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# | |
# Fluentd | |
# | |
# Licensed under the Apache License, Version 2.0 (the "License"); | |
# you may not use this file except in compliance with the License. | |
# You may obtain a copy of the License at | |
# | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# | |
# Unless required by applicable law or agreed to in writing, software | |
# distributed under the License is distributed on an "AS IS" BASIS, | |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
# See the License for the specific language governing permissions and | |
# limitations under the License. | |
# | |
require 'yajl' | |
require 'fluent/input' | |
require 'fluent/time' | |
require 'fluent/timezone' | |
require 'fluent/config/error' | |
module Fluent | |
class ExecInput < Input | |
Plugin.register_input('exec', self) | |
def initialize | |
super | |
require 'fluent/plugin/exec_util' | |
end | |
desc 'The command (program) to execute.' | |
config_param :command, :string | |
desc 'The format used to map the program output to the incoming event.(tsv,json,msgpack)' | |
config_param :format, :string, default: 'tsv' | |
desc 'Specify the comma-separated keys when using the tsv format.' | |
config_param :keys, default: [] do |val| | |
val.split(',') | |
end | |
desc 'Tag of the output events.' | |
config_param :tag, :string, default: nil | |
desc 'The key to use as the event tag instead of the value in the event record. ' | |
config_param :tag_key, :string, default: nil | |
desc 'The key to use as the event time instead of the value in the event record.' | |
config_param :time_key, :string, default: nil | |
desc 'The format of the event time used for the time_key parameter.' | |
config_param :time_format, :string, default: nil | |
desc 'The interval time between periodic program runs.' | |
config_param :run_interval, :time, default: nil | |
def configure(conf) | |
super | |
if localtime = conf['localtime'] | |
@localtime = true | |
elsif utc = conf['utc'] | |
@localtime = false | |
end | |
if conf['timezone'] | |
@timezone = conf['timezone'] | |
Fluent::Timezone.validate!(@timezone) | |
end | |
if !@tag && !@tag_key | |
raise ConfigError, "'tag' or 'tag_key' option is required on exec input" | |
end | |
if @time_key | |
if @time_format | |
f = @time_format | |
@time_parse_proc = Proc.new {|str| Time.strptime(str, f).to_i } | |
else | |
@time_parse_proc = Proc.new {|str| str.to_i } | |
end | |
end | |
@parser = setup_parser(conf) | |
end | |
def setup_parser(conf) | |
case @format | |
when 'tsv' | |
if @keys.empty? | |
raise ConfigError, "keys option is required on exec input for tsv format" | |
end | |
ExecUtil::TSVParser.new(@keys, method(:on_message)) | |
when 'json' | |
ExecUtil::JSONParser.new(method(:on_message)) | |
when 'msgpack' | |
ExecUtil::MessagePackParser.new(method(:on_message)) | |
else | |
ExecUtil::TextParserWrapperParser.new(conf, method(:on_message)) | |
end | |
end | |
def start | |
if @run_interval | |
@finished = false | |
@thread = Thread.new(&method(:run_periodic)) | |
else | |
@io = IO.popen(@command, "r") | |
@pid = @io.pid | |
@thread = Thread.new(&method(:run)) | |
end | |
end | |
def shutdown | |
if @run_interval | |
@finished = true | |
@pid = @run_periodic_pid | |
end | |
if @pid | |
begin | |
Process.kill(:TERM, @pid) | |
rescue #Errno::ECHILD, Errno::ESRCH, Errno::EPERM | |
end | |
if @thread.join(0.1) | |
return | |
end | |
begin | |
Process.kill(:KILL, @pid) | |
rescue #Errno::ECHILD, Errno::ESRCH, Errno::EPERM | |
end | |
begin | |
# Need to reap the process because it will become a zombie process | |
Process.detach(@pid) | |
rescue #Errno::ECHILD, Errno::ESRCH, Errno::EPERM | |
end | |
# cleanup the thread | |
Thread.kill(@thread) | |
@thread.join(0.1) | |
end | |
end | |
def run | |
@parser.call(@io) | |
Process.waitpid(@io.pid) | |
end | |
def run_periodic | |
sleep @run_interval | |
until @finished | |
begin | |
io = IO.popen(@command, "r") | |
@run_periodic_pid = io.pid | |
@parser.call(io) | |
rescue | |
log.error "exec failed to run or shutdown child process", error: $!.to_s, error_class: $!.class.to_s | |
log.warn_backtrace $!.backtrace | |
ensure | |
Process.waitpid(@run_periodic_pid) | |
@run_periodic_pid = nil | |
sleep @run_interval | |
end | |
end | |
end | |
private | |
def on_message(record, parsed_time = nil) | |
if val = record.delete(@tag_key) | |
tag = val | |
else | |
tag = @tag | |
end | |
if parsed_time | |
time = parsed_time | |
else | |
if val = record.delete(@time_key) | |
time = @time_parse_proc.call(val) | |
else | |
time = Engine.now | |
end | |
end | |
router.emit(tag, time, record) | |
rescue => e | |
log.error "exec failed to emit", error: e.to_s, error_class: e.class.to_s, tag: tag, record: Yajl.dump(record) | |
end | |
end | |
end |
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