forked from fluent/fluentd
/
engine.rb
267 lines (225 loc) · 5.34 KB
/
engine.rb
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#
# Fluent
#
# Copyright (C) 2011 FURUHASHI Sadayuki
#
# 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
class EngineClass
def initialize
@matches = []
@sources = []
@match_cache = {}
@started = []
@default_loop = nil
end
def init
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
self
end
def read_config(path)
$log.info "reading config file", :path=>path
File.open(path) {|io|
parse_config(io, File.basename(path), File.dirname(path))
}
end
def parse_config(io, fname, basepath=Dir.pwd)
conf = Config.parse(io, fname, basepath)
configure(conf)
conf.check_not_fetched {|key,e|
$log.warn "parameter '#{key}' in #{e.to_s.strip} is not used."
}
end
def configure(conf)
conf.elements.select {|e|
e.name == 'source'
}.each {|e|
type = e['type']
unless type
raise ConfigError, "Missing 'type' parameter on <source> directive"
end
$log.info "adding source type=#{type.dump}"
input = Plugin.new_input(type)
input.configure(e)
@sources << input
}
conf.elements.select {|e|
e.name == 'match'
}.each {|e|
type = e['type']
pattern = e.arg
unless type
raise ConfigError, "Missing 'type' parameter on <match #{e.arg}> directive"
end
$log.info "adding match", :pattern=>pattern, :type=>type
output = Plugin.new_output(type)
output.configure(e)
match = Match.new(pattern, output)
@matches << match
}
end
def load_plugin_dir(dir)
Plugin.load_plugin_dir(dir)
end
def emit(tag, time, record)
emit_stream tag, OneEventStream.new(time, record)
end
def emit_array(tag, array)
emit_stream tag, ArrayEventStream.new(array)
end
def emit_stream(tag, es)
target = @match_cache[tag]
unless target
target = match(tag) || NoMatchMatch.new
if @match_cache.size < 1024 # TODO size limit
@match_cache[tag] = target
end
end
target.emit(tag, es)
rescue
$log.warn "emit transaction failed ", :error=>$!.to_s
$log.warn_backtrace
raise
end
def match(tag)
@matches.find {|m| m.match(tag) }
end
def match?(tag)
!!match(tag)
end
def flush!
flush_recursive(@matches)
end
def now
# TODO thread update
Time.now.to_i
end
def run
begin
start
if match?($log.tag)
$log.enable_event
end
# 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
rescue
$log.error "unexpected error", :error=>$!.to_s
$log.error_backtrace
ensure
shutdown
end
end
def stop
$log.info "shutting down fluentd"
if @default_loop
@default_loop.stop
@default_loop = nil
end
nil
end
private
def start
@matches.each {|m|
m.start
@started << m
}
@sources.each {|s|
s.start
@started << s
}
end
def shutdown
@started.reverse_each {|s|
begin
s.shutdown
rescue
$log.warn "unexpected error while shutting down", :error=>$!.to_s
$log.warn_backtrace
end
}
end
def flush_recursive(array)
array.each {|m|
begin
if m.is_a?(Match)
m = m.output
end
if m.is_a?(BufferedOutput)
m.force_flush
elsif m.is_a?(MultiOutput)
flush_recursive(m.outputs)
end
rescue
$log.debug "error while force flushing", :error=>$!.to_s
$log.debug_backtrace
end
}
end
class NoMatchMatch
def initialize
@count = 0
end
def emit(tag, es)
# TODO use time instead of num of records
c = (@count += 1)
if c < 512
if Math.log(c) / Math.log(2) % 1.0 == 0
$log.warn "no patterns matched", :tag=>tag
return
end
else
if c % 512 == 0
$log.warn "no patterns matched", :tag=>tag
return
end
end
$log.on_trace { $log.trace "no patterns matched", :tag=>tag }
end
def start
end
def shutdown
end
def match(tag)
false
end
end
end
Engine = EngineClass.new
module Test
@@test = false
def test?
@@test
end
def self.setup
@@test = true
Fluent.__send__(:remove_const, :Engine)
engine = Fluent.const_set(:Engine, EngineClass.new).init
engine.define_singleton_method(:now=) {|n|
@now = n.to_i
}
engine.define_singleton_method(:now) {
@now || super()
}
nil
end
end
end