72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
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package time2
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import (
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"sync"
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"time"
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)
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var (
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stopMux sync.RWMutex
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stoppedFor time.Duration
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stoppedAt *time.Time
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// Now returns current time. For testing aid it could be replaced with a
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// stoppable implementation.
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Now = time.Now
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)
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// InstrumentNow extends the package with a testing suitable implementation of
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// the Now function. This function is supposed to be called at the beginning of
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// a test suite.
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func InstrumentNow() {
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Now = stoppableNow
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}
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// RestoreNow resets Now implementaion to the one from standard library. I have
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// no clue if it's going to be useful or not.
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func RestoreNow() {
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Now = time.Now
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}
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// stoppableNow returns current time taking time manipulation into account.
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func stoppableNow() time.Time {
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stopMux.RLock()
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defer stopMux.RUnlock()
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if stoppedAt != nil {
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return *stoppedAt
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}
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return time.Now().Add(-stoppedFor)
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}
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// Stop makes the time stop.
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func Stop() {
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stopMux.Lock()
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if stoppedAt != nil {
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panic("Time was already stopped")
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}
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now := Now()
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stoppedAt = &now
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stopMux.Unlock()
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}
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// Resume makes the time go again.
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func Resume() {
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stopMux.Lock()
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if stoppedAt == nil {
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panic("Time was not stopped")
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}
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stoppedFor += time.Since(*stoppedAt)
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stoppedAt = nil
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stopMux.Unlock()
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}
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// Reset makes it appear like time was never been frozen. Call this function
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// at the beginning of every test case.
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func Reset() {
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stopMux.Lock()
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stoppedAt = nil
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stoppedFor = 0
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stopMux.Unlock()
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}
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