The erl-chat-server from luisgabriel

erl-chat-server's Introduction

What is this?

A simple chat server written in Erlang. It was built with the propose of learn a bit about the language.

How can I run?

Compile: erl -make

Run Erlang VM: erl -pa ebin/

Run chat server: chat_server:start(<PORT>).

How can I interact with the server?

It was defined a communication protocol over TCP. So you can interact with the server sending via TCP known messages.

Protocol

The protocol messages will be described below.

Client to Server

CONNECT:<nick>: Try connection with the server.

SAY:<msg>: Send a public message to the chat room.

PVT:<nick>:<msg>: Send a private message to a specific user.

QUIT:: Disconnect from the server.

Server to Client

CONNECT:OK:<nick1>:<nick2>:(...):<nickN>: Positive response from a CONNECT message sent by client. The online user list is sent in message.

CONNECT:ERROR:<reason>: Negative response from a CONNECT message sent by the client.

PVT:<nick>:<msg>: A private message sent to the client by .

JOIN:<nick>: Notify when someone joined the chat room.

LEFT:<nick>: Notify when someone left the chat room.

References

Here is some helpful references used during the development:

Learn You Some Erlang for Great Good!

A Generic Server Tutorial

A Generalized TCP Server

Erlang Examples: Talk with Sockets

Contributors

Luís Gabriel Lima (luisgabriel)

Rafael Brandão (rafaelbrandao)

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erl-chat-server's Issues

PVT:<nick>:<msg> not work.

Hi! )
From telnet I connecting to server (port server 2221):
telnet 192.168.1.100 2221
CONNECT:User1
CONNECT:Ok:User1

From other terminal I connecting to server withe nick User2 )))

telnet 192.168.1.100 2221
CONNECT:User2
CONNECT:Ok:User2

If I send SAY:Hello it's work.
But If i Send PVT:User1:Hi
Message don't sending.

What's bug?
Thx)

Unable to ssh into server.

I started a server on port 8080.chat_server:start(8080)

I then tried to SSH into the server with

ssh 100.115.92.201 -p 8080

but it gives me this error:

=CRASH REPORT==== 9-Apr-2022::18:32:02.710764 ===
  crasher:
    initial call: tcp_server:accept_loop/1
    pid: <0.85.0>
    registered_name: []
    exception error: no match of right hand side value {"SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2\r\n",
                                                        []}
      in function  chat_server:pre_loop/1 (src/chat_server.erl, line 14)
    ancestors: [chat_server,<0.82.0>]
    message_queue_len: 0
    messages: []
    links: [#Port<0.8>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 376
    stack_size: 27
    reductions: 968
  neighbours: