I wrote my app that use Lua and connect to my server using Ruby but when the application start, it seem stop working. I'm not sure what the problem is because I'm new to Ruby but I ever used Python and have the same problem Corona Simulator stop working after connecting to server
I'm curious is Ruby have something like http protocol requirement or not? Below is my code using puts to send data to client.
require "socket"
class Server
def initialize(ip,port)
puts "Server Start!!"
#server = TCPServer.open(ip,port)
#connections = Hash.new
#rooms = Hash.new
#clients = Hash.new
#connections[:server] = #server
#connections[:rooms] = #rooms
#connections[:clients] = #clients
end
def run
loop {
Thread.start(#server.accept) do |client|
puts "New client connected."
nickname = client.gets.chomp.to_sym
puts "#{nickname} #{client}"
#connections[:clients][nickname] = client
client.puts "Hi there"
client.print "\n"
client.close
end
}.join
end
end
server = Server.new("127.0.0.1",8080)
server.run
add
client.print "\n
client.close
at the end of thread function and it should work
Related
I have a module that should send GPS location to my server. Below I describe how communication happens between module and server:
When the module connects to the server, module sends its IMEI.
If server accepts data, then should reply to module 01. Note that confirmation should be sent as binary packet. I.e. 1 byte 0x01.
I'm struggling at second step. Have tried various combination, but neither worked.
client.puts('\x01')
client.send([0x01].pack("C"), 0)
client.write["01"].pack('H*')
Below is a full code example:
require 'socket'
class ClientThread
def initialize(port)
#server = TCPServer.open(port)
end
def run
puts "Started TCP Server"
loop do
Thread.start(#server.accept) do |client|
2.times do |index|
data = client.recv(8192)
if index == 0
client.send('\x01'.encode('utf-8'), 0) # RESPONSE TO DEVISE THAT SERVER IS READY TO ACCEPT DATA
elsif index == 1
puts self.log("Done! Closing Connection")
client.close
else
client.send('\x00'.encode('utf-8'), 0) # RESPONSE TO DEVISE THAT SERVER IS NOT READY TO ACCEPT DATA
end
end # end of loop twice
end # end of Thread
end # end of infinite loop
end # run method
end # end of class
new_thread = ClientThread.new(65432)
p new_thread.run
Device does not understand that server is ready to accept data. Most likely, because binary packet is formed incorrectly. How do you form response, so device would understand to send GSP data?
Ask me please if any questions. Thanks.
I have managed to make it work.
Instead of client.send('\x01'.encode('utf-8'), 0) I have used client.puts [0x01].pack("C") and module started to send data.
Below is a full working example for Teltonika FMT100.
Module sends its IMEI to the server.
Server accepts data and replies as binary packet 0x01.
Module send GPS data to the server. At this point you will need to decode data.
require 'socket'
class ClientThread
def initialize(port)
#server = TCPServer.open(port)
#imei = "unknown"
end
def log(msg)
"#{Time.now.utc} #{msg}"
end
def run
puts self.log("Started TCP Server")
loop do
Thread.start(#server.accept) do |client|
if client
2.times do |index|
begin
data = client.recv(8192)
if index == 0
#imei = data
p self.log("Device Authenticated | IMEI: #{#imei}")
client.puts [0x01].pack("C")
elsif index == 1
p data.unpack('H*').first
p self.log("Done! Closing Connection")
client.close
else
client.puts [0x00].pack("C")
end
rescue IOError
p self.log("Stream is already closed")
end
end # end of loop twice
else
p self.log('Socket is null')
end # if conditional
end # end of Thread
end # end of infinite loop
end # run method
end # end of class
new_thread = ClientThread.new(65432)
p new_thread.run
You should get something similar to:
"2021-12-30 11:12:22 UTC Device Authenticated | IMEI: \u0000\u000F357544374597827"
"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"
"2021-12-30 11:12:24 UTC Done! Closing Connection"
I'm get stuck to write a tcp server daemon in Ruby 2.3. The issue is, that my connection is not going further, when postfix is communicating with the ruby tcp server. If i do connect to the ruby tcp server by telnet, everything works fine. My code is as follows:
require 'socket'
require_relative 'postfix_delegation_object'
class Server
attr_reader :binding, :port
def initialize(binding: '127.0.0.1', port: '1988')
puts "Starting server now!"
puts "Listening on tcp://#{binding}:#{port}"
socket = TCPServer.new(binding, port)
while client = socket.accept
Thread.new { handle_connection(client) }
end
end
def handle_connection(client)
hash_values = {}
puts "New client! #{client}"
while line = client.gets
if line.include? "="
key, val = line.split('=')
hash_values[key] = val.to_s.strip
else
pdo = PostfixDelegationObject.new(hash_values)
client.write("action=dunno")
end
end
end
end
I could solve it by my own. I just had to enter twice '\n'
like this:
client.write("action=dunno\n\n")
This one would not work:
client.write("action=dunno")
client.write("\n\n")
I wrote a TCP server using below code. This is to receive GPS location data via GSM network from a remote GPS sensor.
require 'socket'
server = TCPServer.open(2000) # Listen on port 2000
sockets = [server] # An array of sockets we'll monitor
log = STDOUT # Send log messages to standard out
while true
ready = select(sockets)
readable = ready[0]
readable.each do |socket|
if socket == server
client = server.accept
sockets << client
log.puts "Accepted connection from #{client.peeraddr[2]}"
while msg = client.gets
puts msg
end
else
input = socket.gets
if !input
log.puts "Client on #{socket.peeraddr[2]} disconnected"
sockets.delete(socket)
socket.close
next
end
input.chop!
if (input == "quit")
socket.puts("Bye");
log.puts "Closing connnection to #{socket.peeraddr[2]}"
sockets.delete(socket)
socket.close
else
socket.puts(input.reverse)
end
end
end
end
and then I wrote one using Eventmachine. Code as below:
require 'eventmachine'
module EchoServer
def post_init
puts "-- someone connected to the echo server!"
end
def receive_data data
puts data
end
def unbind
puts "-- someone disconnected from the echo server!"
end
end
EventMachine::run {
EventMachine::start_server "127.0.0.1", 2000, EchoServer
}
However, this eventmachine code will not receive nor display the data. Any part of the Eventmachine code that is wrong?
Thanks
I think your problem is that you are listening on localhost only, try this:
EM::run do
EM.start_server "0.0.0.0", 2000, EchoServer
end
I'm studying how to use ZeroMQ together with EventMachine.
To test things out, I wrote a small program in ruby (echo client server) where i used XREQ and XREP sockets. The client application is sending messages to server (consecutive numbers) and getting them back in responce. The interval between sendings is 0.1s.
Everything works... until a certain moment. When current number reaches about 400, server just freezes and doesn't respond to client anymore. I tested this on several computers, and still got that strange issue.
The code is pretty straightforward:
server.rb
require 'rubygems'
require 'bundler/setup'
require 'em-zeromq'
Thread.abort_on_exception = true
ADDRESS = 'tcp://127.0.0.1:2091'
class EMServerHandler
attr_reader :received
def on_readable(socket, messages)
client_identity = messages.shift.copy_out_string #getting client identity from the 1st part of the message
messages.shift #skip the delimeter
messages.each do |m|
msg = m.copy_out_string
puts "server received from #{client_identity}: " + msg
socket.send_msg("#{client_identity}",'',"#{msg}") #echo message back to the client
end
end
end
trap('INT') do
EM::stop()
end
puts "Program started (with zmq #{ZMQ::Util.version.join('.')})."
EM.run do
EventMachine.epoll
ctx = EM::ZeroMQ::Context.new(1)
server = ctx.bind(ZMQ::XREP, ADDRESS, EMServerHandler.new, {:identity => "server"})
end
client.rb
require 'rubygems'
require 'bundler/setup'
require 'em-zeromq'
Thread.abort_on_exception = true
ADDRESS = 'tcp://127.0.0.1:2091'
class EMClientHandler
attr_reader :received
def on_readable(socket, messages)
messages.shift #skip the delimeter
messages.each do |m|
puts "client recieved: " + m.copy_out_string
end
end
end
trap('INT') do
EM::stop()
end
puts "Program started (with zmq #{ZMQ::Util.version.join('.')})."
EM.run do
EventMachine.epoll
ctx = EM::ZeroMQ::Context.new(1)
puts "client"
puts "enter client name >> "
identity = gets.strip
client = ctx.connect(ZMQ::XREQ, ADDRESS, EMClientHandler.new, {:identity => identity})
client.send_msg('', "hello from client #{identity}")
count = 0
EM::PeriodicTimer.new(0.1) do
client.send_msg('', "#{count += 1}")
end
end
Please help me figure out the reason for this.
Your ZeroMQ context is being reaped by the garbage collector.
You need to move your call to EM::ZeroMQ::Context#new outside of the EM loop.
See the README
At last I figured out that this issue only appeared when using ruby 1.9.3p0, so it feels like this is a bug of that version of ruby.
With ruby 1.9.2 everything works like a charm.
I am writing a ruby script to be used as Postfix SMTP access policy delegation. The script needs to access a Tokyo Tyrant database. I am using EventMachine to take care of network connections. EventMachine needs a EventMachine::Connection class that is instantiated by EventMachine‘s processing loop whenever a new connection is created. so for each connection a class is instantiated and destroyed.
I am creating a connection to Tokyo Tyrant from the post_init of the EventMachine::Connection (ie right after connection is setup) and tearing it down after connection is terminated.
My question is if this is the proper way to connect to db? ie making a connection every yime I need it and tearing it down after I am finished? Wouldn't be better to connect to DB once (when program is started) tear it down during program shutdown? If that is so how should I code that ?
My code is:
require 'rubygems'
require 'eventmachine'
require 'rufus/tokyo/tyrant'
class LineCounter < EM::Connection
ActionAllow = "action=dunno\n\n"
def post_init
puts "Received a new connection"
#tokyo = Rufus::Tokyo::Tyrant.new('server', 1978)
#data_received = ""
end
def receive_data data
#data_received << data
#data_received.lines do |line|
key = line.split('=')[0]
value = line.split('=')[1]
#reverse_client_name = value.strip() if key == 'reverse_client_name'
#client_address = value.strip() if key == 'client_address'
#tokyo[#client_address] = #reverse_client_name
end
puts #client_address, #reverse_client_name
send_data ActionAllow
end
def unbind
#tokyo.close
end
end
EventMachine::run {
host,port = "127.0.0.1", 9997
EventMachine::start_server host, port, LineCounter
puts "Now accepting connections on address #{host}, port #{port}..."
EventMachine::add_periodic_timer( 10 ) { $stderr.write "*" }
}
with regards,
raj
Surprising there's no answers to this question.
What you probably need is a connection pool where you can fetch, use, and return connections as they are required.
class ConnectionPool
def initialize(&block)
#pool = [ ]
#generator = block
end
def fetch
#pool.shift or #generator and #generator.call
end
def release(handle)
#pool.push(handle)
end
def use
if (block_given?)
handle = fetch
yield(handle)
release(handle)
end
end
end
# Declare a pool with an appropriate connection generator
tokyo_pool = ConnectionPool.new do
Rufus::Tokyo::Tyrant.new('server', 1978)
end
# Fetch/Release cycle
tokyo = tokyo_pool.fetch
tokyo[#client_address] = #reverse_client_name
tokyo_pool.release(tokyo)
# Simple block-method for use
tokyo_pool.use do |tokyo|
tokyo[#client_address] = #reverse_client_name
end