Fix time issues on Wasm (#2544)

lib/src/kvs/ds.rs

@@ -29,8 +29,12 @@ use std::collections::HashMap;
 use std::fmt;
 use std::sync::Arc;
 use std::time::Duration;
+#[cfg(not(target_arch = "wasm32"))]
+use std::time::{SystemTime, UNIX_EPOCH};
 use tracing::instrument;
 use tracing::trace;
+#[cfg(target_arch = "wasm32")]
+use wasmtimer::std::{SystemTime, UNIX_EPOCH};
 
 /// Used for cluster logic to move LQ data to LQ cleanup code
 /// Not a stored struct; Used only in this module
@@ -552,9 +556,9 @@ impl Datastore {
 	// tick is called periodically to perform maintenance tasks.
 	// This is called every TICK_INTERVAL.
 	pub async fn tick(&self) -> Result<(), Error> {
-		let now = std::time::SystemTime::now()
-			.duration_since(std::time::UNIX_EPOCH)
-			.map_err(|e| Error::Internal(e.to_string()))?;
+		let now = SystemTime::now().duration_since(UNIX_EPOCH).map_err(|e| {
+			Error::Internal(format!("Clock may have gone backwards: {:?}", e.duration()))
+		})?;
 		let ts = now.as_secs();
 		self.tick_at(ts).await?;
 		Ok(())

lib/src/kvs/tx.rs

@@ -42,8 +42,11 @@ use std::fmt;
 use std::fmt::Debug;
 use std::ops::Range;
 use std::sync::Arc;
+#[cfg(not(target_arch = "wasm32"))]
 use std::time::{SystemTime, UNIX_EPOCH};
 use uuid::Uuid;
+#[cfg(target_arch = "wasm32")]
+use wasmtimer::std::{SystemTime, UNIX_EPOCH};
 
 /// A set of undoable updates and requests against a dataset.
 #[allow(dead_code)]
@@ -1002,7 +1005,10 @@ impl Transaction {
 
 	pub(crate) fn clock(&self) -> Timestamp {
 		// Use a timestamp oracle if available
-		let now: u128 = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_millis();
+		let now: u128 = match SystemTime::now().duration_since(UNIX_EPOCH) {
+			Ok(duration) => duration.as_millis(),
+			Err(error) => panic!("Clock may have gone backwards: {:?}", error.duration()),
+		};
 		Timestamp {
 			value: now as u64,
 		}

lib/src/vs/oracle.rs

@@ -3,7 +3,10 @@
 
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Mutex;
+#[cfg(not(target_arch = "wasm32"))]
 use std::time::{SystemTime, UNIX_EPOCH};
+#[cfg(target_arch = "wasm32")]
+use wasmtimer::std::{SystemTime, UNIX_EPOCH};
 
 use super::{u16_u64_to_versionstamp, u64_to_versionstamp, u64_u16_to_versionstamp, Versionstamp};
 
@@ -144,9 +147,10 @@ fn now() -> Versionstamp {
 #[allow(unused)]
 // Returns the number of seconds since the Unix Epoch (January 1st, 1970 at UTC).
 fn secs_since_unix_epoch() -> u64 {
-	let start = SystemTime::now();
-	let since_the_epoch = start.duration_since(UNIX_EPOCH).expect("Time went backwards");
-	since_the_epoch.as_secs()
+	match SystemTime::now().duration_since(UNIX_EPOCH) {
+		Ok(duration) => duration.as_secs(),
+		Err(error) => panic!("Clock may have gone backwards: {:?}", error.duration()),
+	}
 }
 
 mod tests {