dave
38 lines
1.5 KiB
Rust
38 lines
1.5 KiB
Rust
//! Server-start-time utilities for stale-merge detection.
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/// Wall-clock time captured the first time this server process touches the
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/// merge subsystem. Used to detect merge_jobs left over from a previous
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/// server instance: a re-exec on `rebuild_and_restart` keeps the same PID,
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/// so PID alone cannot distinguish "current" vs "previous" server. This
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/// timestamp is fresh per-process (the static is reset by execve) and is
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/// the source of truth for stale-merge detection.
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static SERVER_START_TIME: std::sync::OnceLock<f64> = std::sync::OnceLock::new();
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/// Return this server process's start time (lazily captured on first call).
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pub(crate) fn server_start_time() -> f64 {
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*SERVER_START_TIME.get_or_init(unix_now)
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}
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/// Encode the current server's start-time into the CRDT `error` field for
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/// a Running merge job.
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pub(crate) fn encode_server_start_time(t: f64) -> String {
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format!("{{\"server_start\":{t}}}")
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}
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/// Decode the server-start-time from a Running merge job's `error` field.
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/// Returns `None` for legacy entries (which encoded `pid` instead) — those
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/// are treated as stale by the cleanup pass.
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pub(crate) fn decode_server_start_time(error: Option<&str>) -> Option<f64> {
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error
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.and_then(|e| serde_json::from_str::<serde_json::Value>(e).ok())
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.and_then(|v| v["server_start"].as_f64())
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}
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/// Current Unix timestamp in seconds as `f64`.
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pub(crate) fn unix_now() -> f64 {
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std::time::SystemTime::now()
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.duration_since(std::time::UNIX_EPOCH)
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.unwrap_or_default()
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.as_secs_f64()
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}
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