CODEU CHAT SERVER | README

DISCLAIMER

CODEU is a program created by Google to develop the skills of future software engineers. This project is not an offical Google Product. This project is a playground for those looking to develop their coding and software engineering skills.

ENVIRONMENT

All instructions here are relative to a LINUX environment. There will be some differences if you are working on a non-LINUX system. We will not support any other development environment.

This project was built using JAVA 7. It is recommended that you install JAVA 7 when working with this project.

GETTING STARTED

There is a single python script build.py that is used to build and run the project. There are many ways to run a python script. The syntax below should work almost anywhere if the script is in your current directory.

To build the project:

   $ python build.py clean
   $ python build.py build

To test the project:

   $ python build.py run codeu.chat.TestRunner

To run the project you will need to run both the client and the server. Run the following two commands in separate shells:
```
   $ python build.py run codeu.chat.ServerMain <team_id> <team_secret> <port> <persistent-dir>
   $ python build.py run codeu.chat.ClientMain "<host>@<port>"
```
You must provide the following startup arguments to ServerMain:
- <team_id> and <team_secret>: a numeric id for your team, and a secret code, which are used to authenticate your server with the Relay server. You can specify any integer value for <team_id>, and a value expressed in hexadecimal format (using numbers 0-9 and letters in the range A-F) for <team_secret> when you launch the server in your local setup since it will not connect to the Relay server.
- <port>: the TCP port that your Server will listen on for connections from the Client. You can use any value between 1024 and 65535, as long as there is no other service currently listening on that port in your system. The server will return an error:
```
 java.net.BindException: Address already in use (Bind failed)
```
  if the port is already in use.
- <persistent-dir>: the path where you want the server to save data between runs. This directory must exist when you start the server.
  
  The startup argument for running ClientMain is <host>@<port>:
- <host>: the hostname or IP address of the computer on which the server is listening. If you are running server and client on the same computer, you can use localhost here.
- <port>: the port on which your server is listening. Must be the same port number you specified when you launched ServerMain.
- The "@" between <host> and <port> is mandatory.

All running images write informational and exceptional events to log files. The default setting for log messages is "INFO". You may change this to get more or fewer messages, and you are encouraged to add more LOG statements to the code. The logging is implemented in codeu.chat.util.Logger.java, which is built on top of java.util.logging.Logger, which you can refer to for more information.

In addition to your team's client and server, the project also includes a Relay Server. This is not needed to get your project started. You can start it locally using python build.py run codeu.chat.RelayMain <args>. Look in RelayMain.Java for information about arguments.

Finding your way around the project

All the source files (except test-related source files) are in ./src/codeu/chat. The test source files are in ./test/codeu/chat. If you use the supplied scripts to build the project, the .class files will be placed in ./bin. There is a ./third_party directory that holds the jar files for JUnit (a Java testing framework). Your environment may or may not already have this installed. The supplied scripts use the version in ./third_party.

Finally, there are some high-level design documents in the project Wiki. Please review them as they can help you find your way around the sources.

Source Directories

The major project components have been separated into their own packages. The main packages/directories under src/codeu/chat are:

codeu.chat.client

Classes for building a simple client (codeu.chat.ClientMain).