mirror of https://github.com/grafana/grafana.git
140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
package expr
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import (
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"context"
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"encoding/json"
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"fmt"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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"github.com/grafana/grafana/pkg/apimachinery/identity"
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"github.com/grafana/grafana/pkg/services/datasources"
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)
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// Request is similar to plugins.DataQuery but with the Time Ranges is per Query.
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type Request struct {
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Headers map[string]string
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Debug bool
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OrgId int64
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Queries []Query
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User identity.Requester
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}
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// Query is like plugins.DataSubQuery, but with a a time range, and only the UID
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// for the data source. Also interval is a time.Duration.
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type Query struct {
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RefID string
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TimeRange TimeRange
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DataSource *datasources.DataSource `json:"datasource"`
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JSON json.RawMessage
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Interval time.Duration
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QueryType string
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MaxDataPoints int64
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}
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// TimeRange is a time.Time based TimeRange.
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type TimeRange interface {
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AbsoluteTime(now time.Time) backend.TimeRange
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}
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type AbsoluteTimeRange struct {
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From time.Time
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To time.Time
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}
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func (r AbsoluteTimeRange) AbsoluteTime(_ time.Time) backend.TimeRange {
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return backend.TimeRange{
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From: r.From,
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To: r.To,
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}
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}
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// RelativeTimeRange is a time range relative to some absolute time.
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type RelativeTimeRange struct {
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From time.Duration
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To time.Duration
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}
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func (r RelativeTimeRange) AbsoluteTime(t time.Time) backend.TimeRange {
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return backend.TimeRange{
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From: t.Add(r.From),
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To: t.Add(r.To),
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}
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}
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// TransformData takes Queries which are either expressions nodes
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// or are datasource requests.
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func (s *Service) TransformData(ctx context.Context, now time.Time, req *Request) (r *backend.QueryDataResponse, err error) {
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if s.isDisabled() {
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return nil, fmt.Errorf("server side expressions are disabled")
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}
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start := time.Now()
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ctx, span := s.tracer.Start(ctx, "SSE.TransformData")
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defer func() {
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var respStatus string
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switch err {
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case nil:
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respStatus = "success"
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default:
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respStatus = "failure"
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}
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duration := float64(time.Since(start).Nanoseconds()) / float64(time.Millisecond)
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s.metrics.ExpressionsQuerySummary.WithLabelValues(respStatus).Observe(duration)
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span.End()
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}()
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// Build the pipeline from the request, checking for ordering issues (e.g. loops)
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// and parsing graph nodes from the queries.
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pipeline, err := s.BuildPipeline(ctx, req)
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if err != nil {
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return nil, err
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}
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// Execute the pipeline
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responses, err := s.ExecutePipeline(ctx, now, pipeline)
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if err != nil {
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return nil, err
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}
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// Get which queries have the Hide property so they those queries' results
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// can be excluded from the response.
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hidden, err := hiddenRefIDs(req.Queries)
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if err != nil {
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return nil, err
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}
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if len(hidden) != 0 {
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filteredRes := backend.NewQueryDataResponse()
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for refID, res := range responses.Responses {
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if _, ok := hidden[refID]; !ok {
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filteredRes.Responses[refID] = res
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}
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}
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responses = filteredRes
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}
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return responses, nil
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}
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func hiddenRefIDs(queries []Query) (map[string]struct{}, error) {
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hidden := make(map[string]struct{})
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for _, query := range queries {
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hide := struct {
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Hide bool `json:"hide"`
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}{}
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if err := json.Unmarshal(query.JSON, &hide); err != nil {
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return nil, err
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}
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if hide.Hide {
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hidden[query.RefID] = struct{}{}
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}
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}
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return hidden, nil
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}
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