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Merge pull request #33 from gofiber/add_timestamp_calculator
Add timestamp calculation functionality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
| ) | ||
|
|
||
| var ( | ||
| timestampTimer sync.Once | ||
| // Timestamp please start the timer function before you use this value | ||
| // please load the value with atomic `atomic.LoadUint32(&utils.Timestamp)` | ||
| Timestamp uint32 | ||
| ) | ||
|
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| // StartTimeStampUpdater starts a concurrent function which stores the timestamp to an atomic value per second, | ||
| // which is much better for performance than determining it at runtime each time | ||
| func StartTimeStampUpdater() { | ||
| timestampTimer.Do(func() { | ||
| // set initial value | ||
| atomic.StoreUint32(&Timestamp, uint32(time.Now().Unix())) | ||
| go func(sleep time.Duration) { | ||
| ticker := time.NewTicker(sleep) | ||
| defer ticker.Stop() | ||
|
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| for t := range ticker.C { | ||
| // update timestamp | ||
| atomic.StoreUint32(&Timestamp, uint32(t.Unix())) | ||
| } | ||
| }(1 * time.Second) // duration | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package utils | ||
|
|
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| import ( | ||
| "sync/atomic" | ||
| "testing" | ||
| "time" | ||
|
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| "github.com/stretchr/testify/require" | ||
| ) | ||
|
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| func checkTimeStamp(t testing.TB, expectedCurrent, actualCurrent uint32) { | ||
| // test with some buffer in front and back of the expectedCurrent time -> because of the timing on the work machine | ||
| require.Equal(t, true, actualCurrent >= expectedCurrent-1 || actualCurrent <= expectedCurrent+1) | ||
| } | ||
|
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| func Test_TimeStampUpdater(t *testing.T) { | ||
| t.Parallel() | ||
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| StartTimeStampUpdater() | ||
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| now := uint32(time.Now().Unix()) | ||
| checkTimeStamp(t, now, atomic.LoadUint32(&Timestamp)) | ||
| // one second later | ||
| time.Sleep(1 * time.Second) | ||
| checkTimeStamp(t, now+1, atomic.LoadUint32(&Timestamp)) | ||
| // two seconds later | ||
| time.Sleep(1 * time.Second) | ||
| checkTimeStamp(t, now+2, atomic.LoadUint32(&Timestamp)) | ||
| } | ||
|
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| func Benchmark_CalculateTimestamp(b *testing.B) { | ||
| StartTimeStampUpdater() | ||
|
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| var res uint32 | ||
| b.Run("fiber", func(b *testing.B) { | ||
| for n := 0; n < b.N; n++ { | ||
| res = atomic.LoadUint32(&Timestamp) | ||
| } | ||
| checkTimeStamp(b, uint32(time.Now().Unix()), res) | ||
| }) | ||
| b.Run("default", func(b *testing.B) { | ||
| for n := 0; n < b.N; n++ { | ||
| res = uint32(time.Now().Unix()) | ||
| } | ||
| checkTimeStamp(b, uint32(time.Now().Unix()), res) | ||
| }) | ||
| } |