cloudflare/tableflip

Features

• Socket Handoffs - Passes open TCP or UDP listeners from a parent process to a child process to maintain continuous service availability.
• Zero-Downtime Socket Handovers - Provides a mechanism to transfer listening TCP, UDP, and Unix domain sockets between processes to ensure continuous service availability during restarts.
• Process Lifecycle Managers - Acts as a coordinator for graceful shutdowns and process synchronization using file-based tracking and system signals.
• Graceful Shutdowns - Ensures clean termination of services by allowing in-flight requests to complete before shutting down.
• Zero-Downtime Upgrades - Updates application code without dropping active network connections by transferring file descriptors between processes.
• Listener Handoffs - Hands over TCP, UDP, and Unix domain socket listeners to a child process to maintain connectivity.
• Descriptor Passing - Provides a mechanism for passing network sockets and open files between process instances to maintain active sessions.
• File Descriptor Restoration - Allows the transfer of open file descriptors from a parent process to a child process to maintain active connections.
• Process Handoff Synchronization - Coordinates process shutdown by waiting for the parent process to exit or acknowledge the resource transfer.
• Process Lifecycle Management - Coordinates the handoff and graceful shutdown of system processes during version upgrades or configuration changes.
• Signal-Driven Process Spawning - Triggers the creation of a new process instance and resource transfer upon receiving specific system signals.
• Upgrade Signaling - Triggers a new process instance and transfer of file descriptors upon receiving a specific system signal.
• Connection Draining - Implements a mechanism to stop accepting new connections while allowing existing requests to complete before process exit.
• Socket Transfer Utilities - Provides a system for handing over Unix domain sockets and network listeners between processes during service upgrades.
• Non-Blocking File Descriptor Transitions - Sets inherited file descriptors to non-blocking mode to prevent the child process from hanging during execution.
• Process Shutdown Synchronization - Synchronizes process shutdown by waiting for a parent process to exit or responding to system signals.
• Readiness Notifiers - Notifies a parent process that a new instance is ready to take over and clean up inherited descriptors.
• PID-Based Process Tracking - Uses a persistent file to store the process ID for coordinating transitions between old and new versions.

Star history