Struct EngineProcessManager 

pub struct EngineProcessManager { /* private fields */ }

Manages the rivet-engine subprocess.

The engine is intentionally orphaned: dropping the manager (or having the host process exit) must NOT terminate the engine. This lets a dev-server restart of the rivetkit host reattach to the same long-lived engine and keep all in-flight actor state. To honor that contract:

• Command::kill_on_drop is left at its default (false) so the tokio Child does not send SIGKILL on drop.
• Stdout and stderr are routed to log files at spawn time so the engine’s write fds remain valid after the host’s pipes close.
• On startup we probe the configured endpoint and reuse a healthy engine instead of spawning a duplicate.

When we spawn the engine, watcher holds a tokio task that owns the Child and awaits child.wait() so we get a log line if the engine dies while rivetkit is still running. On Drop we abort the watcher; aborting drops the Child without killing it (kill_on_drop=false), so the engine stays running and gets reparented to init when rivetkit exits.

watcher is None when we attached to an already-running engine.

Implementations

impl EngineProcessManager

pub async fn start_or_reuse(config: EngineResolverConfig) -> Result<Self>

pub fn startup(&self) -> &EngineStartup

How the engine was obtained: freshly spawned or reused.

Trait Implementations

impl Debug for EngineProcessManager

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for EngineProcessManager

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.