Enhance signal handling to support proper daemon operation:
- SIGTERM: Graceful shutdown (same behavior as SIGINT)
- SIGQUIT: Graceful shutdown with full statistics dump
- SIGUSR1: Log rotation acknowledgment for external tools
- SIGUSR2: Dump runtime status to log without stopping
Statistics dump includes connection counts, ME keepalive metrics,
and relay adaptive tuning counters. SIGHUP config reload unchanged
(handled in hot_reload.rs).
Signals are handled via tokio::signal::unix with async select!
to avoid blocking the runtime. Non-shutdown signals (USR1/USR2)
run in a background task spawned at startup.
Signed-off-by: Vladimir Krivopalov <argenet@yandex.ru>
Implement core daemon infrastructure for running telemt as a background
service on Unix platforms (Linux, FreeBSD, etc.):
- Add src/daemon module with classic double-fork daemonization
- Implement flock-based PID file management to prevent duplicate instances
- Add privilege dropping (setuid/setgid) after socket binding
- New CLI flags: --daemon, --foreground, --pid-file, --run-as-user,
--run-as-group, --working-dir
Daemonization occurs before tokio runtime starts to ensure clean fork.
PID file uses exclusive locking to detect already-running instances.
Privilege dropping happens after bind_listeners() to allow binding
to privileged ports (< 1024) before switching to unprivileged user.
Signed-off-by: Vladimir Krivopalov <argenet@yandex.ru>
- Introduced adversarial tests to validate the behavior of the health monitoring system under various conditions, including the management of draining writers.
- Implemented integration tests to ensure the health monitor correctly handles expired and empty draining writers.
- Added regression tests to verify the functionality of the draining writers' cleanup process, ensuring it adheres to the defined thresholds and budgets.
- Updated the module structure to include the new test files for better organization and maintainability.
- Bump telemt dependency version from 3.3.15 to 3.3.19.
- Add `metrics_listen` option to `config.toml` for specifying a custom address for the metrics endpoint.
- Update `ServerConfig` struct to include `metrics_listen` and adjust logic in `spawn_metrics_if_configured` to prioritize this new option over `metrics_port`.
- Enhance error handling for invalid listen addresses in metrics setup.
This commit adds support for configuring the data path via a
configuration file or command-line option. This may be useful
on systems without systemd, such as OpenWrt or Alpine Linux.
Signed-off-by: Maxim Anisimov <maxim.anisimov.ua@gmail.com>
Vladimir Krivopalov