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require 'xmpp4r/stream'
module Jabber
module Reliable
class Connection < Jabber::Client
def initialize(full_jid, config)
super(full_jid)
@servers = config[:servers]
@port = config[:port] || 5222
@max_retry = config[:max_retry] || 30
@retry_sleep = config[:retry_sleep] || 2
if(@servers.nil? or @servers.empty?)
@servers = [@jid.domain]
end
end
def connect
retry_count = 0
server_to_use = nil
server_pool = @servers.dup.sort{ rand <=> rand }
begin
server_to_use = server_pool.shift
server_pool.push(server_to_use)
Jabber::debuglog "timeout will be: #{@retry_sleep.to_f}"
Timeout.timeout(@retry_sleep.to_f){
Jabber::debuglog "trying to connect to #{server_to_use}"
super(server_to_use, @port)
}
Jabber::debuglog self.jid.to_s + " connected to " + server_to_use.to_s
Jabber::debuglog "out of possible servers " + @servers.inspect
rescue Exception, Timeout::Error => e
Jabber::warnlog "#{server_to_use} error: #{e.inspect}. Will attempt to reconnect in #{@retry_sleep}"
sleep(@retry_sleep.to_f)
if(retry_count >= @max_retry.to_i)
Jabber::warnlog "reached max retry count on exception, failing"
raise e
end
retry_count += 1
retry
end
end
end
class Listener
def initialize(full_jid, password, config, &block)
@on_message_block = block
@full_jid = full_jid
@config = config
@password = password
@max_retry = config[:max_retry] || 30
end
def setup_connection
@connection = Connection.new(@full_jid, @config)
if @on_message_block
@connection.add_message_callback(&@on_message_block)
else
@connection.add_message_callback do |msg|
self.on_message(msg)
end
end
#We could just reconnect in @connection.on_exception,
#but by raising into this seperate thread, we avoid growing our stack trace
@reconnection_thread = Thread.new do
first_run = true
begin
self.start unless first_run
loop do
sleep(1)
Thread.pass
end
rescue => e
first_run = false
retry
end
end
@exception_handlers = []
@connection.on_exception do |e, connection, where_failed|
self.run_exception_handlers(e, connection, where_failed)
end
end
def run_exception_handlers(e, connection, where_failed)
@exception_handlers.each do |ex_handler|
ex_handler.call(e, connection, where_failed)
end
if where_failed == :sending
@message_to_send_on_reconnect = @message_now_sending
end
if where_failed != :close && !@connection.is_connected?
@reconnection_thread.raise(e)
end
end
def add_exception_handler(&block)
@exception_handlers << block
end
def start
setup_connection unless @connection
connect
auth
send_presence
if @message_to_send_on_reconnect
send_message(@message_to_send_on_reconnect)
end
@message_to_send_on_reconnect = nil
end
#Stop the listener. (close the connection)
def stop
@connection.close if @connection and @connection.is_connected?
@connection = nil
end
def connect
@connection.connect
end
def auth
@connection.auth(@password)
end
def send_presence
presence_message = @config[:presence_message]
if presence_message && !presence_message.empty?
@connection.send(Jabber::Presence.new.set_show(:chat).set_status(presence_message))
end
end
#TODO: test and fix situation where we get disconnected while sending but then successfully reconnect
# (and make sure in such cases we resent)
def send_message(message)
unless @connection
raise ::ArgumentError, "Can't send messages while listener is stopped. Plase 'start' the listener first."
end
retry_count = 0
begin
while(not @connection.is_connected?)
#wait
Thread.pass
end
@message_now_sending = message
@connection.send(message)
return true #true, message was sent
rescue => e
if e.is_a?(Interrupt)
raise e
end
if(retry_count > @max_retry.to_i)
Jabber::debuglog "reached max retry count on message re-send, failing"
raise e
end
retry_count += 1
Jabber::debuglog "retrying message send.." + e.inspect
retry
end
end
end
end
end
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