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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// Copyright 2013 The Prometheus 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.
package model
import (
"math"
"strconv"
native_time "time"
)
// Timestamp is the number of milliseconds since the epoch
// (1970-01-01 00:00 UTC) excluding leap seconds.
type Timestamp int64
const (
// MinimumTick is the minimum supported time resolution. This has to be
// at least native_time.Second in order for the code below to work.
MinimumTick = native_time.Millisecond
// second is the timestamp duration equivalent to one second.
second = int64(native_time.Second / MinimumTick)
// The number of nanoseconds per minimum tick.
nanosPerTick = int64(MinimumTick / native_time.Nanosecond)
// Earliest is the earliest timestamp representable. Handy for
// initializing a high watermark.
Earliest = Timestamp(math.MinInt64)
// Latest is the latest timestamp representable. Handy for initializing
// a low watermark.
Latest = Timestamp(math.MaxInt64)
)
// Equal reports whether two timestamps represent the same instant.
func (t Timestamp) Equal(o Timestamp) bool {
return t == o
}
// Before reports whether the timestamp t is before o.
func (t Timestamp) Before(o Timestamp) bool {
return t < o
}
// After reports whether the timestamp t is after o.
func (t Timestamp) After(o Timestamp) bool {
return t > o
}
// Add returns the Timestamp t + d.
func (t Timestamp) Add(d native_time.Duration) Timestamp {
return t + Timestamp(d/MinimumTick)
}
// Sub returns the Duration t - o.
func (t Timestamp) Sub(o Timestamp) native_time.Duration {
return native_time.Duration(t-o) * MinimumTick
}
// Time returns the time.Time representation of t.
func (t Timestamp) Time() native_time.Time {
return native_time.Unix(int64(t)/second, (int64(t)%second)*nanosPerTick)
}
// Unix returns t as a Unix time, the number of seconds elapsed
// since January 1, 1970 UTC.
func (t Timestamp) Unix() int64 {
return int64(t) / second
}
// UnixNano returns t as a Unix time, the number of nanoseconds elapsed
// since January 1, 1970 UTC.
func (t Timestamp) UnixNano() int64 {
return int64(t) * nanosPerTick
}
// String returns a string representation of the timestamp.
func (t Timestamp) String() string {
return strconv.FormatFloat(float64(t)/float64(second), 'f', -1, 64)
}
// MarshalJSON implements the json.Marshaler interface.
func (t Timestamp) MarshalJSON() ([]byte, error) {
return []byte(t.String()), nil
}
// Now returns the current time as a Timestamp.
func Now() Timestamp {
return TimestampFromTime(native_time.Now())
}
// TimestampFromTime returns the Timestamp equivalent to the time.Time t.
func TimestampFromTime(t native_time.Time) Timestamp {
return TimestampFromUnixNano(t.UnixNano())
}
// TimestampFromUnix returns the Timestamp equivalent to the Unix timestamp t
// provided in seconds.
func TimestampFromUnix(t int64) Timestamp {
return Timestamp(t * second)
}
// TimestampFromUnixNano returns the Timestamp equivalent to the Unix timestamp
// t provided in nanoseconds.
func TimestampFromUnixNano(t int64) Timestamp {
return Timestamp(t / nanosPerTick)
}
|
