fix: allow higher resolution timestamps (#1570)

* fix: allow higher resolution timestamps

* fix: higher precision requires coarser test

tests/v2/test_utils_time.nim

@@ -0,0 +1,35 @@
+{.used.}
+
+import
+  stew/results,
+  testutils/unittests
+import
+  ../../waku/v2/utils/time
+
+suite "Utils - Time":
+
+  test "Test timestamp conversion":
+    ## Given
+    let
+      nanoseconds = 1676562429123456789.int64
+      secondsPart = nanoseconds div 1_000_000_000
+      nanosecondsPart = nanoseconds mod 1_000_000_000
+      secondsFloat = secondsPart.float64 + (nanosecondsPart.float64 / 1_000_000_000.float64)
+      lowResTimestamp = Timestamp(secondsPart.int64 * 1_000_000_000.int64) # 1676562429000000000
+      highResTimestamp = Timestamp(secondsFloat * 1_000_000_000.float64) # 1676562429123456789
+
+    require highResTimestamp > lowResTimestamp # Sanity check
+
+    ## When
+    let
+      timeInSecondsInt = secondsPart.int
+      timeInSecondsInt64 = secondsPart.int64
+      timeInSecondsFloat = float(secondsFloat)
+      timeInSecondsFloat64 = float64(secondsFloat)
+
+    ## Then
+    check:
+      getNanosecondTime(timeInSecondsInt) == lowResTimestamp
+      getNanosecondTime(timeInSecondsInt64) == lowResTimestamp
+      getNanosecondTime(timeInSecondsFloat) == highResTimestamp
+      getNanosecondTime(timeInSecondsFloat64) == highResTimestamp

tests/v2/waku_archive/test_waku_archive.nim

@@ -100,7 +100,7 @@ suite "Waku Archive - message handling":
     ## Given
     let
       now = now()
-      invalidSenderTime = now + MaxMessageTimestampVariance + 1
+      invalidSenderTime = now + MaxMessageTimestampVariance + 1_000_000_000 # 1 second over the max variance
 
     let message = fakeWakuMessage(ts=invalidSenderTime)
 

waku/v2/utils/time.nim

@@ -8,20 +8,12 @@ import
   std/times,
   metrics
 
-type Timestamp* = int64
+type Timestamp* = int64 # A nanosecond precision timestamp
 
-proc getNanosecondTime*[T](timeInSeconds: T): Timestamp =
+proc getNanosecondTime*[T: SomeNumber](timeInSeconds: T): Timestamp =
-  var ns = Timestamp(timeInSeconds.int64 * 1000_000_000.int64)
+  var ns = Timestamp(timeInSeconds * 1_000_000_000.T)
   return ns
 
-proc getMicrosecondTime*[T](timeInSeconds: T): Timestamp =
-  var us = Timestamp(timeInSeconds.int64 * 1000_000.int64)
-  return us
-
-proc getMillisecondTime*[T](timeInSeconds: T): Timestamp =
-  var ms = Timestamp(timeInSeconds.int64 * 1000.int64)
-  return ms
-
 proc nowInUnixFloat(): float =
   return getTime().toUnixFloat()