-
Notifications
You must be signed in to change notification settings - Fork 342
/
creationmetrics.go
164 lines (132 loc) · 3.58 KB
/
creationmetrics.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
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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
package builtin
import (
"time"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/routing"
)
const (
maxAge = 2
metricsPrefix = "routeCreationTime."
)
// RouteCreationMetrics reports metrics about the time it took to create metrics.
// It looks for filters of type OriginMarker to determine when the source object (e.g. ingress) of the route
// was created.
// If an OriginMarker with the same type and id is seen again, the creation time is not reported again, because
// a route with the same configuration already existed before.
type RouteCreationMetrics struct {
metrics filters.Metrics
originIdAges map[string]map[string]int
initialized bool
}
func NewRouteCreationMetrics(metrics filters.Metrics) *RouteCreationMetrics {
return &RouteCreationMetrics{metrics: metrics, originIdAges: map[string]map[string]int{}}
}
func removeOriginMarkers(r []*routing.Route) {
for _, ri := range r {
var (
f []*routing.RouteFilter
foundOriginMarkers bool
)
for i, fi := range ri.Filters {
_, isOriginMarker := fi.Filter.(*OriginMarker)
if !isOriginMarker && !foundOriginMarkers {
continue
}
if !isOriginMarker {
f = append(f, fi)
continue
}
if !foundOriginMarkers {
f = make([]*routing.RouteFilter, i, len(ri.Filters))
copy(f, ri.Filters[:i])
foundOriginMarkers = true
}
}
if foundOriginMarkers {
ri.Filters = f
}
}
}
// Do implements routing.PostProcessor and records the filter creation time.
func (m *RouteCreationMetrics) Do(routes []*routing.Route) []*routing.Route {
return m.reportRouteCreationTimes(routes)
}
func (m *RouteCreationMetrics) reportRouteCreationTimes(routes []*routing.Route) []*routing.Route {
for _, r := range routes {
for origin, start := range m.startTimes(r) {
if m.initialized {
m.metrics.MeasureSince(metricsPrefix+origin, start)
}
}
}
if !m.initialized {
//must be done after filling the cache
m.initialized = true
}
m.pruneCache()
removeOriginMarkers(routes)
return routes
}
func (m *RouteCreationMetrics) startTimes(route *routing.Route) map[string]time.Time {
startTimes := map[string]time.Time{}
for _, f := range route.Filters {
origin, t := m.originStartTime(f.Filter)
if t.IsZero() {
continue
}
old, exists := startTimes[origin]
if !exists || t.Before(old) {
startTimes[origin] = t
}
}
return startTimes
}
func (m *RouteCreationMetrics) originStartTime(f filters.Filter) (string, time.Time) {
marker, ok := f.(*OriginMarker)
if !ok {
return "", time.Time{}
}
origin := marker.Origin
id := marker.Id
created := marker.Created
if origin == "" || id == "" || created.IsZero() {
return "", time.Time{}
}
originCache := m.originIdAges[origin]
if originCache == nil {
originCache = map[string]int{}
m.originIdAges[origin] = originCache
}
_, exists := originCache[id]
originCache[id] = 0
if exists {
return "", time.Time{}
}
log.WithFields(log.Fields{
"origin": origin,
"id": id,
"seconds": time.Since(created).Seconds(),
}).Debug("route creation time")
return origin, created
}
func (m *RouteCreationMetrics) pruneCache() {
for origin, idAges := range m.originIdAges {
for id, age := range idAges {
age++
if age > maxAge {
log.WithFields(log.Fields{
"origin": origin,
"id": id,
}).Debug("delete from route creation cache")
delete(idAges, id)
} else {
idAges[id] = age
}
}
if len(idAges) == 0 {
log.WithField("origin", origin).Debug("delete from route creation cache")
delete(m.originIdAges, origin)
}
}
}