Created
November 10, 2011 21:53
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Log streaming in ruby.
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class LogProducer | |
attr_accessor :streams | |
def initialize(options = {}) | |
@streams = Hash.new | |
@filename = options[:filename] | |
add_stream(options[:stream]) | |
end | |
def add_stream(stream) | |
@streams[stream.key] = stream | |
end | |
def start | |
@thread = Thread.new do | |
File::Tail::Logfile.tail(@filename, :backward => 10) do |line| | |
@streams.each do |key, stream| | |
stream.queue << line | |
end | |
end | |
end | |
end | |
def stop | |
@thread.kill | |
end | |
def should_stop? | |
delete_idle_streams | |
@streams.empty? | |
end | |
private | |
def delete_idle_streams | |
@streams.each do |key, stream| | |
if(stream.idle?) | |
@streams.delete(key) | |
end | |
end | |
end | |
end |
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require 'digest' | |
class LogStream | |
IDLE_THRESHOLD = 20 | |
attr_accessor :queue, :key, :filename | |
def initialize() | |
@queue = Queue.new | |
@key = generate_hash | |
@last_read_at = Time.now.to_i | |
end | |
def log_messages() | |
@last_read_at = Time.now.to_i | |
messages = [] | |
@queue.size.times do |i| | |
messages << @queue.pop | |
end | |
messages | |
end | |
def idle?() | |
idle_time > IDLE_THRESHOLD | |
end | |
def idle_time() | |
Time.now.to_i - @last_read_at | |
end | |
def generate_hash() | |
h = Digest::SHA2.new << Time.now.to_i.to_s | |
h.to_s | |
end | |
end |
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require 'rubygems' | |
require 'file/tail' | |
require 'thread' | |
require './log_stream' | |
require './log_producer' | |
class LogStreamer | |
def self.start_log_stream(filename) | |
log_stream = LogStream.new | |
start_producer(filename, log_stream) | |
start_sweeper | |
log_stream.key | |
end | |
def self.log_messages(filename, key) | |
producers[filename].streams[key].log_messages | |
end | |
def self.producers | |
@@producers ||= Hash.new | |
end | |
def self.start_producer(filename, stream) | |
if(producers.has_key?(filename)) | |
producers[filename].add_stream(stream) | |
else | |
producers[filename] = LogProducer.new(:filename => filename, :stream => stream) | |
producers[filename].start | |
end | |
end | |
def self.start_sweeper | |
@@sweeper ||= Thread.new do | |
while(1) do | |
producers.each do |k, v| | |
if(v.should_stop?) | |
puts "Stopping producer thread." | |
v.stop | |
producers.delete(k) | |
end | |
end | |
sleep(5) | |
end | |
end | |
end | |
end |
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