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extractor.go
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/
extractor.go
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package alerting
import (
"errors"
"fmt"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/log"
m "github.com/grafana/grafana/pkg/models"
)
type DashAlertExtractor struct {
Dash *m.Dashboard
OrgId int64
log log.Logger
}
func NewDashAlertExtractor(dash *m.Dashboard, orgId int64) *DashAlertExtractor {
return &DashAlertExtractor{
Dash: dash,
OrgId: orgId,
log: log.New("alerting.extractor"),
}
}
func (e *DashAlertExtractor) lookupDatasourceId(dsName string) (*m.DataSource, error) {
if dsName == "" {
query := &m.GetDataSourcesQuery{OrgId: e.OrgId}
if err := bus.Dispatch(query); err != nil {
return nil, err
} else {
for _, ds := range query.Result {
if ds.IsDefault {
return ds, nil
}
}
}
} else {
query := &m.GetDataSourceByNameQuery{Name: dsName, OrgId: e.OrgId}
if err := bus.Dispatch(query); err != nil {
return nil, err
} else {
return query.Result, nil
}
}
return nil, errors.New("Could not find datasource id for " + dsName)
}
func findPanelQueryByRefId(panel *simplejson.Json, refId string) *simplejson.Json {
for _, targetsObj := range panel.Get("targets").MustArray() {
target := simplejson.NewFromAny(targetsObj)
if target.Get("refId").MustString() == refId {
return target
}
}
return nil
}
func (e *DashAlertExtractor) GetAlerts() ([]*m.Alert, error) {
e.log.Debug("GetAlerts")
alerts := make([]*m.Alert, 0)
for _, rowObj := range e.Dash.Data.Get("rows").MustArray() {
row := simplejson.NewFromAny(rowObj)
for _, panelObj := range row.Get("panels").MustArray() {
panel := simplejson.NewFromAny(panelObj)
jsonAlert, hasAlert := panel.CheckGet("alert")
if !hasAlert {
continue
}
// backward compatability check, can be removed later
enabled, hasEnabled := jsonAlert.CheckGet("enabled")
if hasEnabled && enabled.MustBool() == false {
continue
}
frequency, err := getTimeDurationStringToSeconds(jsonAlert.Get("frequency").MustString())
if err != nil {
return nil, ValidationError{Reason: "Could not parse frequency"}
}
alert := &m.Alert{
DashboardId: e.Dash.Id,
OrgId: e.OrgId,
PanelId: panel.Get("id").MustInt64(),
Id: jsonAlert.Get("id").MustInt64(),
Name: jsonAlert.Get("name").MustString(),
Handler: jsonAlert.Get("handler").MustInt64(),
Message: jsonAlert.Get("message").MustString(),
Frequency: frequency,
}
for _, condition := range jsonAlert.Get("conditions").MustArray() {
jsonCondition := simplejson.NewFromAny(condition)
jsonQuery := jsonCondition.Get("query")
queryRefId := jsonQuery.Get("params").MustArray()[0].(string)
panelQuery := findPanelQueryByRefId(panel, queryRefId)
if panelQuery == nil {
reason := fmt.Sprintf("Alert on PanelId: %v refers to query(%s) that cannot be found", alert.PanelId, queryRefId)
return nil, ValidationError{Reason: reason}
}
dsName := ""
if panelQuery.Get("datasource").MustString() != "" {
dsName = panelQuery.Get("datasource").MustString()
} else if panel.Get("datasource").MustString() != "" {
dsName = panel.Get("datasource").MustString()
}
if datasource, err := e.lookupDatasourceId(dsName); err != nil {
return nil, err
} else {
jsonQuery.SetPath([]string{"datasourceId"}, datasource.Id)
}
if interval, err := panel.Get("interval").String(); err == nil {
panelQuery.Set("interval", interval)
}
jsonQuery.Set("model", panelQuery.Interface())
}
alert.Settings = jsonAlert
// validate
_, err = NewRuleFromDBAlert(alert)
if err == nil && alert.ValidToSave() {
alerts = append(alerts, alert)
} else {
return nil, err
}
}
}
e.log.Debug("Extracted alerts from dashboard", "alertCount", len(alerts))
return alerts, nil
}