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// Copyright 2022 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package collector
import (
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"net/url"
"path"
"github.com/prometheus/client_golang/prometheus"
)
type dataStreamMetric struct {
Type prometheus.ValueType
Desc *prometheus.Desc
Value func(dataStreamStats DataStreamStatsDataStream) float64
Labels func(dataStreamStats DataStreamStatsDataStream) []string
}
var (
defaultDataStreamLabels = []string{"data_stream"}
defaultDataStreamLabelValues = func(dataStreamStats DataStreamStatsDataStream) []string {
return []string{dataStreamStats.DataStream}
}
)
// DataStream Information Struct
type DataStream struct {
logger *slog.Logger
client *http.Client
url *url.URL
dataStreamMetrics []*dataStreamMetric
}
// NewDataStream defines DataStream Prometheus metrics
func NewDataStream(logger *slog.Logger, client *http.Client, url *url.URL) *DataStream {
return &DataStream{
logger: logger,
client: client,
url: url,
dataStreamMetrics: []*dataStreamMetric{
{
Type: prometheus.CounterValue,
Desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "data_stream", "backing_indices_total"),
"Number of backing indices",
defaultDataStreamLabels, nil,
),
Value: func(dataStreamStats DataStreamStatsDataStream) float64 {
return float64(dataStreamStats.BackingIndices)
},
Labels: defaultDataStreamLabelValues,
},
{
Type: prometheus.CounterValue,
Desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "data_stream", "store_size_bytes"),
"Store size of data stream",
defaultDataStreamLabels, nil,
),
Value: func(dataStreamStats DataStreamStatsDataStream) float64 {
return float64(dataStreamStats.StoreSizeBytes)
},
Labels: defaultDataStreamLabelValues,
},
},
}
}
// Describe adds DataStream metrics descriptions
func (ds *DataStream) Describe(ch chan<- *prometheus.Desc) {
for _, metric := range ds.dataStreamMetrics {
ch <- metric.Desc
}
}
func (ds *DataStream) fetchAndDecodeDataStreamStats() (DataStreamStatsResponse, error) {
var dsr DataStreamStatsResponse
u := *ds.url
u.Path = path.Join(u.Path, "/_data_stream/*/_stats")
res, err := ds.client.Get(u.String())
if err != nil {
return dsr, fmt.Errorf("failed to get data stream stats health from %s://%s:%s%s: %s",
u.Scheme, u.Hostname(), u.Port(), u.Path, err)
}
defer func() {
err = res.Body.Close()
if err != nil {
ds.logger.Warn(
"failed to close http.Client",
"err", err,
)
}
}()
if res.StatusCode != http.StatusOK {
return dsr, fmt.Errorf("HTTP Request failed with code %d", res.StatusCode)
}
bts, err := io.ReadAll(res.Body)
if err != nil {
return dsr, err
}
if err := json.Unmarshal(bts, &dsr); err != nil {
return dsr, err
}
return dsr, nil
}
// Collect gets DataStream metric values
func (ds *DataStream) Collect(ch chan<- prometheus.Metric) {
dataStreamStatsResp, err := ds.fetchAndDecodeDataStreamStats()
if err != nil {
ds.logger.Warn(
"failed to fetch and decode data stream stats",
"err", err,
)
return
}
for _, metric := range ds.dataStreamMetrics {
for _, dataStream := range dataStreamStatsResp.DataStreamStats {
fmt.Printf("Metric: %+v", dataStream)
ch <- prometheus.MustNewConstMetric(
metric.Desc,
metric.Type,
metric.Value(dataStream),
metric.Labels(dataStream)...,
)
}
}
}
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