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prometheus.go
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prometheus.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package metadata
import (
"context"
"net/url"
"github.com/thanos-io/thanos/pkg/metadata/metadatapb"
"github.com/thanos-io/thanos/pkg/promclient"
"github.com/thanos-io/thanos/pkg/tracing"
)
// Prometheus implements metadatapb.Metadata gRPC service that allows to fetch metric metadata from Prometheus HTTP /api/v1/metadata endpoint.
type Prometheus struct {
base *url.URL
client *promclient.Client
}
// NewPrometheus creates a new metadata.Prometheus.
func NewPrometheus(base *url.URL, client *promclient.Client) *Prometheus {
return &Prometheus{
base: base,
client: client,
}
}
// MetricMetadata returns all specified metric metadata from Prometheus.
func (p *Prometheus) MetricMetadata(r *metadatapb.MetricMetadataRequest, s metadatapb.Metadata_MetricMetadataServer) error {
md, err := p.client.MetricMetadataInGRPC(s.Context(), p.base, r.Metric, int(r.Limit))
if err != nil {
return err
}
tracing.DoInSpan(s.Context(), "send_metadata_response", func(_ context.Context) {
err = s.Send(&metadatapb.MetricMetadataResponse{Result: &metadatapb.MetricMetadataResponse_Metadata{
Metadata: metadatapb.FromMetadataMap(md)}})
})
return err
}