add clock module

The Clock module is the system clock that every unix timestamp new goes
through.  It comes with an offset that only tests can set.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/swarm/sync.rs b/src/swarm/sync.rs
index d4503bb..a05e346 100644
--- a/src/swarm/sync.rs
+++ b/src/swarm/sync.rs
@@ -330,6 +330,7 @@ pub(crate) async fn handle_sync(
         let epoch = envelope.epoch;
         let message = envelope.message;
         let peer = peer.to_owned();
+        let clock = Arc::clone(&state.clock);
 
         // Some((caught_up, heads changed)) when applied, None when the message belongs
         // to another epoch.
@@ -366,7 +367,7 @@ pub(crate) async fn handle_sync(
             stats.heads_seen(heads_after.len());
             let changed = heads_after != heads_before;
             if changed && measure_propagation {
-                let now_ms = crate::state::unix_millis() as i64;
+                let now_ms = clock.now_millis() as i64;
                 // Time 0: not stamped (snapshots, older nodes).
                 let delays: Vec<i64> = replica
                     .doc