/
engine.rb
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/
engine.rb
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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.
#
module Fluent
require 'fluent/event_router'
require 'fluent/root_agent'
class EngineClass
def initialize
@root_agent = nil
@event_router = nil
@default_loop = nil
@engine_stopped = false
@log_emit_thread = nil
@log_event_loop_stop = false
@log_event_queue = []
@suppress_config_dump = false
end
MATCH_CACHE_SIZE = 1024
LOG_EMIT_INTERVAL = 0.1
attr_reader :root_agent
attr_reader :matches, :sources
def init(opts = {})
BasicSocket.do_not_reverse_lookup = true
Plugin.load_plugins
if defined?(Encoding)
Encoding.default_internal = 'ASCII-8BIT' if Encoding.respond_to?(:default_internal)
Encoding.default_external = 'ASCII-8BIT' if Encoding.respond_to?(:default_external)
end
suppress_interval(opts[:suppress_interval]) if opts[:suppress_interval]
@suppress_config_dump = opts[:suppress_config_dump] if opts[:suppress_config_dump]
@without_source = opts[:without_source] if opts[:without_source]
@root_agent = RootAgent.new(opts)
self
end
def log
$log
end
def suppress_interval(interval_time)
@suppress_emit_error_log_interval = interval_time
@next_emit_error_log_time = Time.now.to_i
end
def parse_config(io, fname, basepath = Dir.pwd, v1_config = false)
if fname =~ /\.rb$/
require 'fluent/config/dsl'
Config::DSL::Parser.parse(io, File.join(basepath, fname))
else
Config.parse(io, fname, basepath, v1_config)
end
end
def run_configure(conf)
configure(conf)
conf.check_not_fetched { |key, e|
unless e.name == 'system'
unless @without_source && e.name == 'source'
$log.warn "parameter '#{key}' in #{e.to_s.strip} is not used."
end
end
}
end
def configure(conf)
# plugins / configuration dumps
Gem::Specification.find_all.select{|x| x.name =~ /^fluent(d|-(plugin|mixin)-.*)$/}.each do |spec|
$log.info "gem '#{spec.name}' version '#{spec.version}'"
end
unless @suppress_config_dump
$log.info "using configuration file: #{conf.to_s.rstrip}"
end
@root_agent.configure(conf)
@event_router = @root_agent.event_router
end
def load_plugin_dir(dir)
Plugin.load_plugin_dir(dir)
end
def emit(tag, time, record)
unless record.nil?
emit_stream tag, OneEventStream.new(time, record)
end
end
def emit_array(tag, array)
emit_stream tag, ArrayEventStream.new(array)
end
def emit_stream(tag, es)
@event_router.emit_stream(tag, es)
end
def flush!
@root_agent.flush!
end
def now
# TODO thread update
Time.now.to_i
end
def log_event_loop
$log.disable_events(Thread.current)
while sleep(LOG_EMIT_INTERVAL)
break if @log_event_loop_stop
next if @log_event_queue.empty?
# NOTE: thead-safe of slice! depends on GVL
events = @log_event_queue.slice!(0..-1)
next if events.empty?
events.each {|tag,time,record|
begin
@event_router.emit(tag, time, record)
rescue => e
$log.error "failed to emit fluentd's log event", :tag => tag, :event => record, :error_class => e.class, :error => e
end
}
end
end
def run
begin
start
if @event_router.match?($log.tag)
$log.enable_event
@log_emit_thread = Thread.new(&method(:log_event_loop))
end
unless @engine_stopped
# for empty loop
@default_loop = Coolio::Loop.default
@default_loop.attach Coolio::TimerWatcher.new(1, true)
# TODO attach async watch for thread pool
@default_loop.run
end
if @engine_stopped and @default_loop
@default_loop.stop
@default_loop = nil
end
rescue => e
$log.error "unexpected error", :error_class=>e.class, :error=>e
$log.error_backtrace
ensure
$log.info "shutting down fluentd"
shutdown
if @log_emit_thread
@log_event_loop_stop = true
@log_emit_thread.join
end
end
end
def stop
@engine_stopped = true
if @default_loop
@default_loop.stop
@default_loop = nil
end
nil
end
def push_log_event(tag, time, record)
return if @log_emit_thread.nil?
@log_event_queue.push([tag, time, record])
end
private
def start
@root_agent.start
end
def shutdown
@root_agent.shutdown
end
end
Engine = EngineClass.new
end