/
lazy.go
71 lines (59 loc) · 2.05 KB
/
lazy.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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
// Copyright 2017 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 storage
import (
"github.com/prometheus/prometheus/util/annotations"
)
// lazyGenericSeriesSet is a wrapped series set that is initialised on first call to Next().
type lazyGenericSeriesSet struct {
init func() (genericSeriesSet, bool)
set genericSeriesSet
}
func (c *lazyGenericSeriesSet) Next() bool {
if c.set != nil {
return c.set.Next()
}
var ok bool
c.set, ok = c.init()
return ok
}
func (c *lazyGenericSeriesSet) Err() error {
if c.set != nil {
return c.set.Err()
}
return nil
}
func (c *lazyGenericSeriesSet) At() Labels {
if c.set != nil {
return c.set.At()
}
return nil
}
func (c *lazyGenericSeriesSet) Warnings() annotations.Annotations {
if c.set != nil {
return c.set.Warnings()
}
return nil
}
type warningsOnlySeriesSet annotations.Annotations
func (warningsOnlySeriesSet) Next() bool { return false }
func (warningsOnlySeriesSet) Err() error { return nil }
func (warningsOnlySeriesSet) At() Labels { return nil }
func (c warningsOnlySeriesSet) Warnings() annotations.Annotations { return annotations.Annotations(c) }
type errorOnlySeriesSet struct {
err error
}
func (errorOnlySeriesSet) Next() bool { return false }
func (errorOnlySeriesSet) At() Labels { return nil }
func (s errorOnlySeriesSet) Err() error { return s.err }
func (errorOnlySeriesSet) Warnings() annotations.Annotations { return nil }