The ShellConnection class receives commands over a TCP connection and sends responses back to the client.

Commands are received one per line, and responses are sent in RFC 2821-style response chunks. Every command can send multiple response chunks. Intermediate response chunks have a status code of 100, and can occur more than once. The final chunk has a status code has a 200, 4xx or 500 status code and is exactly one line long. If the command was successful, the status code is 200 and the response text is "OK". If the command was not successful (its return code was not 0), the status code is 400 + return code. If the comand resulted in an exception, the status code is 500.

Example (positive response to help command):

100-The following commands are available:
100-bundles (ls, ss)
100-services (lss)
100-start
100-stop
...
100-set
100 Enter <command> --help for more information about a command
200 OK

Example (negative response to login command):

403 DENIED

Creates the ShellConnection.

Destroys the ShellConnection.

See also: Poco::Runnable::run()

Close the underlying socket if our bundle is stopping.

Creates a suitable status code and response message for the command's exit code.