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query.go
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query.go
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package conditions
import (
"fmt"
"strings"
"time"
gocontext "context"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/null"
"github.com/grafana/grafana/pkg/components/simplejson"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/services/alerting"
"github.com/grafana/grafana/pkg/tsdb"
)
func init() {
alerting.RegisterCondition("query", func(model *simplejson.Json, index int) (alerting.Condition, error) {
return NewQueryCondition(model, index)
})
}
type QueryCondition struct {
Index int
Query AlertQuery
Reducer QueryReducer
Evaluator AlertEvaluator
Operator string
HandleRequest tsdb.HandleRequestFunc
}
type AlertQuery struct {
Model *simplejson.Json
DatasourceId int64
From string
To string
}
func (c *QueryCondition) Eval(context *alerting.EvalContext) (*alerting.ConditionResult, error) {
timeRange := tsdb.NewTimeRange(c.Query.From, c.Query.To)
seriesList, err := c.executeQuery(context, timeRange)
if err != nil {
return nil, err
}
emptySerieCount := 0
evalMatchCount := 0
var matches []*alerting.EvalMatch
for _, series := range seriesList {
reducedValue := c.Reducer.Reduce(series)
evalMatch := c.Evaluator.Eval(reducedValue)
if !reducedValue.Valid {
emptySerieCount++
}
if context.IsTestRun {
context.Logs = append(context.Logs, &alerting.ResultLogEntry{
Message: fmt.Sprintf("Condition[%d]: Eval: %v, Metric: %s, Value: %s", c.Index, evalMatch, series.Name, reducedValue),
})
}
if evalMatch {
evalMatchCount++
matches = append(matches, &alerting.EvalMatch{
Metric: series.Name,
Value: reducedValue,
Tags: series.Tags,
})
}
}
// handle no series special case
if len(seriesList) == 0 {
// eval condition for null value
evalMatch := c.Evaluator.Eval(null.FloatFromPtr(nil))
if context.IsTestRun {
context.Logs = append(context.Logs, &alerting.ResultLogEntry{
Message: fmt.Sprintf("Condition: Eval: %v, Query Returned No Series (reduced to null/no value)", evalMatch),
})
}
if evalMatch {
evalMatchCount++
matches = append(matches, &alerting.EvalMatch{Metric: "NoData", Value: null.FloatFromPtr(nil)})
}
}
return &alerting.ConditionResult{
Firing: evalMatchCount > 0,
NoDataFound: emptySerieCount == len(seriesList),
Operator: c.Operator,
EvalMatches: matches,
}, nil
}
func (c *QueryCondition) executeQuery(context *alerting.EvalContext, timeRange *tsdb.TimeRange) (tsdb.TimeSeriesSlice, error) {
getDsInfo := &m.GetDataSourceByIdQuery{
Id: c.Query.DatasourceId,
OrgId: context.Rule.OrgId,
}
if err := bus.Dispatch(getDsInfo); err != nil {
return nil, fmt.Errorf("Could not find datasource %v", err)
}
req := c.getRequestForAlertRule(getDsInfo.Result, timeRange)
result := make(tsdb.TimeSeriesSlice, 0)
resp, err := c.HandleRequest(context.Ctx, getDsInfo.Result, req)
if err != nil {
if err == gocontext.DeadlineExceeded {
return nil, fmt.Errorf("Alert execution exceeded the timeout")
}
return nil, fmt.Errorf("tsdb.HandleRequest() error %v", err)
}
for _, v := range resp.Results {
if v.Error != nil {
return nil, fmt.Errorf("tsdb.HandleRequest() response error %v", v)
}
result = append(result, v.Series...)
if context.IsTestRun {
context.Logs = append(context.Logs, &alerting.ResultLogEntry{
Message: fmt.Sprintf("Condition[%d]: Query Result", c.Index),
Data: v.Series,
})
}
}
return result, nil
}
func (c *QueryCondition) getRequestForAlertRule(datasource *m.DataSource, timeRange *tsdb.TimeRange) *tsdb.TsdbQuery {
req := &tsdb.TsdbQuery{
TimeRange: timeRange,
Queries: []*tsdb.Query{
{
RefId: "A",
Model: c.Query.Model,
DataSource: datasource,
},
},
}
return req
}
func NewQueryCondition(model *simplejson.Json, index int) (*QueryCondition, error) {
condition := QueryCondition{}
condition.Index = index
condition.HandleRequest = tsdb.HandleRequest
queryJson := model.Get("query")
condition.Query.Model = queryJson.Get("model")
condition.Query.From = queryJson.Get("params").MustArray()[1].(string)
condition.Query.To = queryJson.Get("params").MustArray()[2].(string)
if err := validateFromValue(condition.Query.From); err != nil {
return nil, err
}
if err := validateToValue(condition.Query.To); err != nil {
return nil, err
}
condition.Query.DatasourceId = queryJson.Get("datasourceId").MustInt64()
reducerJson := model.Get("reducer")
condition.Reducer = NewSimpleReducer(reducerJson.Get("type").MustString())
evaluatorJson := model.Get("evaluator")
evaluator, err := NewAlertEvaluator(evaluatorJson)
if err != nil {
return nil, err
}
condition.Evaluator = evaluator
operatorJson := model.Get("operator")
operator := operatorJson.Get("type").MustString("and")
condition.Operator = operator
return &condition, nil
}
func validateFromValue(from string) error {
fromRaw := strings.Replace(from, "now-", "", 1)
_, err := time.ParseDuration("-" + fromRaw)
return err
}
func validateToValue(to string) error {
if to == "now" {
return nil
} else if strings.HasPrefix(to, "now-") {
withoutNow := strings.Replace(to, "now-", "", 1)
_, err := time.ParseDuration("-" + withoutNow)
if err == nil {
return nil
}
}
_, err := time.ParseDuration(to)
return err
}