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prometheus_metrics.go
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prometheus_metrics.go
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//
// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
package madmin
import (
"context"
"io"
"net/http"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/prom2json"
)
const (
metricsRespBodyLimit = 10 << 20 // 10 MiB
)
// NodeMetrics - returns Node Metrics in Prometheus format
//
// The client needs to be configured with the endpoint of the desired node
func (client *MetricsClient) NodeMetrics(ctx context.Context) ([]*prom2json.Family, error) {
reqData := metricsRequestData{
relativePath: "/v2/metrics/node",
}
// Execute GET on /minio/v2/metrics/node
resp, err := client.executeRequest(ctx, reqData)
if err != nil {
return nil, err
}
defer closeResponse(resp)
if resp.StatusCode != http.StatusOK {
return nil, httpRespToErrorResponse(resp)
}
return parsePrometheusResults(io.LimitReader(resp.Body, metricsRespBodyLimit))
}
// ClusterMetrics - returns Cluster Metrics in Prometheus format
func (client *MetricsClient) ClusterMetrics(ctx context.Context) ([]*prom2json.Family, error) {
reqData := metricsRequestData{
relativePath: "/v2/metrics/cluster",
}
// Execute GET on /minio/v2/metrics/cluster
resp, err := client.executeRequest(ctx, reqData)
if err != nil {
return nil, err
}
defer closeResponse(resp)
if resp.StatusCode != http.StatusOK {
return nil, httpRespToErrorResponse(resp)
}
return parsePrometheusResults(io.LimitReader(resp.Body, metricsRespBodyLimit))
}
// BucketMetrics - returns Bucket Metrics in Prometheus format
func (client *MetricsClient) BucketMetrics(ctx context.Context) ([]*prom2json.Family, error) {
reqData := metricsRequestData{
relativePath: "/v2/metrics/bucket",
}
// Execute GET on /minio/v2/metrics/bucket
resp, err := client.executeRequest(ctx, reqData)
if err != nil {
return nil, err
}
defer closeResponse(resp)
if resp.StatusCode != http.StatusOK {
return nil, httpRespToErrorResponse(resp)
}
return parsePrometheusResults(io.LimitReader(resp.Body, metricsRespBodyLimit))
}
func parsePrometheusResults(reader io.Reader) (results []*prom2json.Family, err error) {
mfChan := make(chan *dto.MetricFamily)
errChan := make(chan error)
go func() {
defer close(errChan)
err = prom2json.ParseReader(reader, mfChan)
if err != nil {
errChan <- err
}
}()
for mf := range mfChan {
results = append(results, prom2json.NewFamily(mf))
}
if err := <-errChan; err != nil {
return nil, err
}
return results, nil
}