[refactoring] Move providers in a new file, add constructors

Author: g3force

pkg/timer/provider.go

@@ -0,0 +1,35 @@
+package timer
+
+import "time"
+
+// A TimeProvider returns the current time.
+// This is usually the system time, but can be something else for unit tests.
+type TimeProvider func() time.Time
+
+// SysTimeProvider is the default system time provider
+var SysTimeProvider = func() time.Time { return time.Now() }
+
+// SleepConsumer sleeps the given amount of time.
+// This is usually the time.Sleep method, but can be something else for unit tests.
+type SleepConsumer func(time.Duration)
+
+// SysSleepConsumer is the default system sleep consumer
+var SysSleepConsumer = func(d time.Duration) { time.Sleep(d) }
+
+// NewFixedTimeProviderFromNanoSeconds creates a time provider from long nano seconds that always returns a fixed time
+func NewFixedTimeProviderFromNanoSeconds(timestamp int64) TimeProvider {
+	sec := timestamp / 1e9
+	nSec := (timestamp - sec) * 1e9
+	return func() time.Time {
+		return time.Unix(sec, nSec)
+	}
+}
+
+// NewFixedTimeProviderFromSeconds creates a time provider from floating point seconds that always returns a fixed time
+func NewFixedTimeProviderFromSeconds(timestamp float64) TimeProvider {
+	sec := int64(timestamp)
+	nSec := int64((timestamp - float64(sec)) * 1e9)
+	return func() time.Time {
+		return time.Unix(sec, nSec)
+	}
+}

pkg/timer/timer.go

@@ -4,20 +4,6 @@ import (
 	"time"
 )
 
-// A TimeProvider returns the current time.
-// This is usually the system time, but can be something else for unit tests.
-type TimeProvider func() time.Time
-
-// SysTimeProvider is the default system time provider
-var SysTimeProvider = func() time.Time { return time.Now() }
-
-// SleepConsumer sleeps the given amount of time.
-// This is usually the time.Sleep method, but can be something else for unit tests.
-type SleepConsumer func(time.Duration)
-
-// SysSleepConsumer is the default system sleep consumer
-var SysSleepConsumer = func(d time.Duration) { time.Sleep(d) }
-
 // A Timer can be started and stopped. It will start at zero and count up, while running.
 // It is event driven, there are now threads that update any state.
 type Timer struct {