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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
}
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