-
Notifications
You must be signed in to change notification settings - Fork 3.4k
/
client_writeto.go
89 lines (78 loc) · 2.67 KB
/
client_writeto.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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
package client
import (
"fmt"
"sync"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/tsdb/chunks"
"github.com/prometheus/prometheus/tsdb/record"
"github.com/grafana/loki/clients/pkg/promtail/api"
"github.com/grafana/loki/pkg/ingester/wal"
"github.com/grafana/loki/pkg/util"
)
// clientWriteTo implements a wal.WriteTo that re-builds entries with the stored series, and the received entries. After,
// sends each to the provided Client channel.
type clientWriteTo struct {
series map[chunks.HeadSeriesRef]model.LabelSet
seriesLock sync.RWMutex
// seriesSegment keeps track of the last segment in which the series pointed by each key in this map was seen. Keeping
// this in a separate map avoids unnecessary contention.
//
// Even though it doesn't present a difference right now according to benchmarks, it will help when we introduce other
// calls from the wal.Watcher to the wal.WriteTo like `UpdateSeriesSegment`.
seriesSegment map[chunks.HeadSeriesRef]int
seriesSegmentLock sync.RWMutex
logger log.Logger
toClient chan<- api.Entry
}
// newClientWriteTo creates a new clientWriteTo
func newClientWriteTo(toClient chan<- api.Entry, logger log.Logger) *clientWriteTo {
return &clientWriteTo{
series: make(map[chunks.HeadSeriesRef]model.LabelSet),
seriesSegment: make(map[chunks.HeadSeriesRef]int),
toClient: toClient,
logger: logger,
}
}
func (c *clientWriteTo) StoreSeries(series []record.RefSeries, segment int) {
c.seriesLock.Lock()
defer c.seriesLock.Unlock()
c.seriesSegmentLock.Lock()
defer c.seriesSegmentLock.Unlock()
for _, seriesRec := range series {
c.seriesSegment[seriesRec.Ref] = segment
labels := util.MapToModelLabelSet(seriesRec.Labels.Map())
c.series[seriesRec.Ref] = labels
}
}
// SeriesReset will delete all cache entries that were last seen in segments numbered equal or lower than segmentNum
func (c *clientWriteTo) SeriesReset(segmentNum int) {
c.seriesLock.Lock()
defer c.seriesLock.Unlock()
c.seriesSegmentLock.Lock()
defer c.seriesSegmentLock.Unlock()
for k, v := range c.seriesSegment {
if v <= segmentNum {
level.Debug(c.logger).Log("msg", fmt.Sprintf("reclaiming series under segment %d", segmentNum))
delete(c.seriesSegment, k)
delete(c.series, k)
}
}
}
func (c *clientWriteTo) AppendEntries(entries wal.RefEntries) error {
var entry api.Entry
c.seriesLock.RLock()
l, ok := c.series[entries.Ref]
c.seriesLock.RUnlock()
if ok {
entry.Labels = l
for _, e := range entries.Entries {
entry.Entry = e
c.toClient <- entry
}
} else {
level.Debug(c.logger).Log("msg", "series for entry not found")
}
return nil
}