forked from cockroachdb/cockroach
/
time.go
52 lines (45 loc) · 1.49 KB
/
time.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Tamir Duberstein (tamird@gmail.com)
package timeutil
import (
"time"
"github.com/cockroachdb/cockroach/util/envutil"
)
var (
nowFunc = time.Now
)
func initFakeTime() {
if offset := envutil.EnvOrDefaultDuration("simulated_offset", 0); offset == 0 {
nowFunc = time.Now
} else {
nowFunc = func() time.Time {
return time.Now().Add(offset)
}
}
}
// Now returns the current local time with an optional offset specified by the
// environment. The offset functionality is guarded by the "clockoffset" build
// tag - if built with that tag, the clock offset is parsed from the
// "COCKROACH_SIMULATED_OFFSET" environment variable using time.ParseDuration,
// which supports quasi-human values like "1h" or "1m".
func Now() time.Time {
return nowFunc()
}
// Since returns the time elapsed since t.
// It is shorthand for Now().Sub(t).
func Since(t time.Time) time.Duration {
return Now().Sub(t)
}