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rule.go
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rule.go
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package alerting
import (
"fmt"
"regexp"
"strconv"
"time"
"github.com/grafana/grafana/pkg/components/simplejson"
m "github.com/grafana/grafana/pkg/models"
)
type Rule struct {
Id int64
OrgId int64
DashboardId int64
PanelId int64
Frequency int64
Name string
Message string
LastStateChange time.Time
For time.Duration
NoDataState m.NoDataOption
ExecutionErrorState m.ExecutionErrorOption
State m.AlertStateType
Conditions []Condition
Notifications []int64
StateChanges int64
}
type ValidationError struct {
Reason string
Err error
Alertid int64
DashboardId int64
PanelId int64
}
func (e ValidationError) Error() string {
extraInfo := e.Reason
if e.Alertid != 0 {
extraInfo = fmt.Sprintf("%s AlertId: %v", extraInfo, e.Alertid)
}
if e.PanelId != 0 {
extraInfo = fmt.Sprintf("%s PanelId: %v", extraInfo, e.PanelId)
}
if e.DashboardId != 0 {
extraInfo = fmt.Sprintf("%s DashboardId: %v", extraInfo, e.DashboardId)
}
if e.Err != nil {
return fmt.Sprintf("Alert validation error: %s%s", e.Err.Error(), extraInfo)
}
return fmt.Sprintf("Alert validation error: %s", extraInfo)
}
var (
ValueFormatRegex = regexp.MustCompile(`^\d+`)
UnitFormatRegex = regexp.MustCompile(`\w{1}$`)
)
var unitMultiplier = map[string]int{
"s": 1,
"m": 60,
"h": 3600,
}
func getTimeDurationStringToSeconds(str string) (int64, error) {
multiplier := 1
matches := ValueFormatRegex.FindAllString(str, 1)
if len(matches) <= 0 {
return 0, fmt.Errorf("Frequency could not be parsed")
}
value, err := strconv.Atoi(matches[0])
if err != nil {
return 0, err
}
unit := UnitFormatRegex.FindAllString(str, 1)[0]
if val, ok := unitMultiplier[unit]; ok {
multiplier = val
}
return int64(value * multiplier), nil
}
func NewRuleFromDBAlert(ruleDef *m.Alert) (*Rule, error) {
model := &Rule{}
model.Id = ruleDef.Id
model.OrgId = ruleDef.OrgId
model.DashboardId = ruleDef.DashboardId
model.PanelId = ruleDef.PanelId
model.Name = ruleDef.Name
model.Message = ruleDef.Message
model.Frequency = ruleDef.Frequency
model.State = ruleDef.State
model.LastStateChange = ruleDef.NewStateDate
model.For = ruleDef.For
model.NoDataState = m.NoDataOption(ruleDef.Settings.Get("noDataState").MustString("no_data"))
model.ExecutionErrorState = m.ExecutionErrorOption(ruleDef.Settings.Get("executionErrorState").MustString("alerting"))
model.StateChanges = ruleDef.StateChanges
for _, v := range ruleDef.Settings.Get("notifications").MustArray() {
jsonModel := simplejson.NewFromAny(v)
id, err := jsonModel.Get("id").Int64()
if err != nil {
return nil, ValidationError{Reason: "Invalid notification schema", DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
}
model.Notifications = append(model.Notifications, id)
}
for index, condition := range ruleDef.Settings.Get("conditions").MustArray() {
conditionModel := simplejson.NewFromAny(condition)
conditionType := conditionModel.Get("type").MustString()
factory, exist := conditionFactories[conditionType]
if !exist {
return nil, ValidationError{Reason: "Unknown alert condition: " + conditionType, DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
}
queryCondition, err := factory(conditionModel, index)
if err != nil {
return nil, ValidationError{Err: err, DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
}
model.Conditions = append(model.Conditions, queryCondition)
}
if len(model.Conditions) == 0 {
return nil, ValidationError{Reason: "Alert is missing conditions"}
}
return model, nil
}
type ConditionFactory func(model *simplejson.Json, index int) (Condition, error)
var conditionFactories = make(map[string]ConditionFactory)
func RegisterCondition(typeName string, factory ConditionFactory) {
conditionFactories[typeName] = factory
}