feat: Add XMPP client connection manager and consolidate build configuration - #19
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Introduce a new ClientConnectionManager for XMPP client-to-server connections. It provides a module config schema for the C2S listener port (default 5222) and registers the module for config discovery, preparing the server-side connection management scaffolding.
Refactor build configuration to use a single executable target instead of multiple intermediate libraries (xtrpg_config, xtrpg_network, xtrpg_xmpp). Sources are now compiled directly into xtrpg_cpp_server. Changes: - Remove separate library targets and consolidate into executable - Add ENABLE_XMPP_JID build option - Change include/link visibility from PUBLIC to PRIVATE - Remove commented-out legacy storage backend code
This change introduces XML stream tokenization and a dedicated XMPP client session lifecycle. TcpConnection now supports async reads without relying on shared_from_this, and the tokenizer listener contract was simplified to a raw pointer for direct callback handling. ClientConnectionManager now tracks active sessions, creates a session for each new TCP connection, and starts processing the inbound XML stream. A new ClientSession class reads socket data, passes it through the tokenizer, and handles XML events for the XMPP client flow.
Initialize Asio io_context and start a SocketConnectionListener in main. Adds includes, a global atomic shutdown flag and signal handler (SIGINT/SIGTERM/SIGHUP) to support graceful termination. Creates a ClientConnectionManager, registers it as an observer with the listener, reads the C2S port (default 5222) from config, and runs io_context on a thread pool. On shutdown the listener is stopped, io_context is stopped and all IO threads are joined. Also adds a catch-all exception handler and informational logging.
Add std::cout debug output to ClientSession's XML handler methods (openDeclaration, closeDeclaration, setAttribute, appendText) to aid troubleshooting of XML tokenization/parsing. This is a non-functional change that only emits diagnostic logs when those hooks are invoked.
Replace the old multi-observer pattern with a single raw-pointer observer API (Observable::setObserver) and simplify dispatching. Introduce XmlToken and TokenType to represent parsed XML tokens. XmlStreamTokenizer now builds and emits XmlToken instances (and text/comments) via the Observable interface instead of calling listener methods. XmlTokenListener was converted to observer interfaces for XmlToken and TokenizationError. Update ClientSession and main to use the new setObserver/onObservation API and adjust includes. This is an API-level refactor to centralize token events and streamline tokenizer → session communication.
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