forked from grafana/grafana
-
Notifications
You must be signed in to change notification settings - Fork 1
/
eval_context.go
171 lines (143 loc) · 3.83 KB
/
eval_context.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
165
166
167
168
169
170
171
package alerting
import (
"context"
"fmt"
"time"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/log"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/setting"
)
type EvalContext struct {
Firing bool
IsTestRun bool
EvalMatches []*EvalMatch
Logs []*ResultLogEntry
Error error
ConditionEvals string
StartTime time.Time
EndTime time.Time
Rule *Rule
log log.Logger
dashboardRef *m.DashboardRef
ImagePublicUrl string
ImageOnDiskPath string
NoDataFound bool
PrevAlertState m.AlertStateType
Ctx context.Context
}
func NewEvalContext(alertCtx context.Context, rule *Rule) *EvalContext {
return &EvalContext{
Ctx: alertCtx,
StartTime: time.Now(),
Rule: rule,
Logs: make([]*ResultLogEntry, 0),
EvalMatches: make([]*EvalMatch, 0),
log: log.New("alerting.evalContext"),
PrevAlertState: rule.State,
}
}
type StateDescription struct {
Color string
Text string
Data string
}
func (c *EvalContext) GetStateModel() *StateDescription {
switch c.Rule.State {
case m.AlertStateOK:
return &StateDescription{
Color: "#36a64f",
Text: "OK",
}
case m.AlertStateNoData:
return &StateDescription{
Color: "#888888",
Text: "No Data",
}
case m.AlertStateAlerting:
return &StateDescription{
Color: "#D63232",
Text: "Alerting",
}
case m.AlertStateUnknown:
return &StateDescription{
Color: "#888888",
Text: "Unknown",
}
default:
panic("Unknown rule state for alert " + c.Rule.State)
}
}
func (c *EvalContext) ShouldUpdateAlertState() bool {
return c.Rule.State != c.PrevAlertState
}
func (a *EvalContext) GetDurationMs() float64 {
return float64(a.EndTime.Nanosecond()-a.StartTime.Nanosecond()) / float64(1000000)
}
func (c *EvalContext) GetNotificationTitle() string {
return "[" + c.GetStateModel().Text + "] " + c.Rule.Name
}
func (c *EvalContext) GetDashboardUID() (*m.DashboardRef, error) {
if c.dashboardRef != nil {
return c.dashboardRef, nil
}
uidQuery := &m.GetDashboardRefByIdQuery{Id: c.Rule.DashboardId}
if err := bus.Dispatch(uidQuery); err != nil {
return nil, err
}
c.dashboardRef = uidQuery.Result
return c.dashboardRef, nil
}
const urlFormat = "%s?fullscreen&edit&tab=alert&panelId=%d&orgId=%d"
func (c *EvalContext) GetRuleUrl() (string, error) {
if c.IsTestRun {
return setting.AppUrl, nil
}
ref, err := c.GetDashboardUID()
if err != nil {
return "", err
}
return fmt.Sprintf(urlFormat, m.GetFullDashboardUrl(ref.Uid, ref.Slug), c.Rule.PanelId, c.Rule.OrgId), nil
}
// GetNewState returns the new state from the alert rule evaluation
func (c *EvalContext) GetNewState() m.AlertStateType {
ns := getNewStateInternal(c)
if ns != m.AlertStateAlerting || c.Rule.For == 0 {
return ns
}
since := time.Since(c.Rule.LastStateChange)
if c.PrevAlertState == m.AlertStatePending && since > c.Rule.For {
return m.AlertStateAlerting
}
if c.PrevAlertState == m.AlertStateAlerting {
return m.AlertStateAlerting
}
return m.AlertStatePending
}
func getNewStateInternal(c *EvalContext) m.AlertStateType {
if c.Error != nil {
c.log.Error("Alert Rule Result Error",
"ruleId", c.Rule.Id,
"name", c.Rule.Name,
"error", c.Error,
"changing state to", c.Rule.ExecutionErrorState.ToAlertState())
if c.Rule.ExecutionErrorState == m.ExecutionErrorKeepState {
return c.PrevAlertState
}
return c.Rule.ExecutionErrorState.ToAlertState()
}
if c.Firing {
return m.AlertStateAlerting
}
if c.NoDataFound {
c.log.Info("Alert Rule returned no data",
"ruleId", c.Rule.Id,
"name", c.Rule.Name,
"changing state to", c.Rule.NoDataState.ToAlertState())
if c.Rule.NoDataState == m.NoDataKeepState {
return c.PrevAlertState
}
return c.Rule.NoDataState.ToAlertState()
}
return m.AlertStateOK
}