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prometheus.go
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prometheus.go
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// Copyright 2020 Netflix Inc
// Author: Colin McIntosh (colin@netflix.com)
//
// 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 prometheus
import (
"errors"
"fmt"
"net/http"
"strings"
"github.com/openconfig/gnmi/cache"
"github.com/openconfig/gnmi/ctree"
gnmipb "github.com/openconfig/gnmi/proto/gnmi"
prom "github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/openconfig/gnmi-gateway/gateway/configuration"
"github.com/openconfig/gnmi-gateway/gateway/exporters"
"github.com/openconfig/gnmi-gateway/gateway/openconfig"
"github.com/openconfig/gnmi-gateway/gateway/utils"
)
const Name = "prometheus"
var _ exporters.Exporter = new(PrometheusExporter)
func init() {
exporters.Register(Name, NewPrometheusExporter)
}
func NewPrometheusExporter(config *configuration.GatewayConfig) exporters.Exporter {
return &PrometheusExporter{
config: config,
deltaCalc: NewDeltaCalculator(),
metrics: make(map[Hash]prom.Metric),
typeLookup: new(openconfig.TypeLookup),
}
}
type PrometheusExporter struct {
config *configuration.GatewayConfig
cache *cache.Cache
deltaCalc *DeltaCalculator
metrics map[Hash]prom.Metric
typeLookup *openconfig.TypeLookup
}
func (e *PrometheusExporter) Name() string {
return Name
}
func (e *PrometheusExporter) Export(leaf *ctree.Leaf) {
notification := leaf.Value().(*gnmipb.Notification)
for _, update := range notification.Update {
value, isNumber := utils.GetNumberValues(update.Val)
if !isNumber {
continue
}
metricName, labels := UpdateToMetricNameAndLabels(notification.GetPrefix(), update)
metricHash := NewStringMapHash(metricName, labels)
metric, exists := e.metrics[metricHash]
if !exists {
var path []string
for _, elem := range update.Path.Elem {
path = append(path, elem.Name)
}
metricType := e.typeLookup.GetTypeByPath(path)
switch metricType {
case "counter64":
metric = promauto.NewCounter(prom.CounterOpts{
Name: metricName,
ConstLabels: labels,
})
case "gauge32":
default:
metric = promauto.NewGauge(prom.GaugeOpts{
Name: metricName,
ConstLabels: labels,
})
}
e.metrics[metricHash] = metric
}
switch m := metric.(type) {
case prom.Counter:
delta, exists := e.deltaCalc.Calc(metricHash, value)
if exists && delta >= 0 {
m.Add(delta)
}
case prom.Gauge:
m.Set(value)
}
}
}
func (e *PrometheusExporter) Start(cache *cache.Cache) error {
e.config.Log.Info().Msg("Starting Prometheus exporter.")
if e.config.OpenConfigDirectory == "" {
return errors.New("value is not set for OpenConfigDirectory configuration")
}
e.cache = cache
err := e.typeLookup.LoadAllModules(e.config.OpenConfigDirectory)
if err != nil {
e.config.Log.Error().Err(err).Msgf("Unable to load OpenConfig modules in %s: %v", e.config.OpenConfigDirectory, err)
return err
}
go e.runHttpServer()
return nil
}
func (e *PrometheusExporter) runHttpServer() {
var errCount = 0
var lastError error
for {
e.config.Log.Info().Msg("Starting Prometheus HTTP server.")
http.Handle("/metrics", promhttp.Handler())
err := http.ListenAndServe(":59100", nil)
if err != nil {
e.config.Log.Error().Err(err).Msgf("Prometheus HTTP server stopped with an error: %v", err)
if err.Error() == lastError.Error() {
errCount = errCount + 1
if errCount >= 3 {
panic(fmt.Errorf("too many errors returned by Prometheus HTTP server: %s", err.Error()))
}
} else {
errCount = 0
lastError = err
}
}
}
}
func UpdateToMetricNameAndLabels(prefix *gnmipb.Path, update *gnmipb.Update) (string, map[string]string) {
metricName := ""
labels := make(map[string]string)
if prefix != nil {
target := prefix.GetTarget()
if target != "" {
labels["target"] = target
}
}
for _, elem := range update.Path.Elem {
elemName := strings.ReplaceAll(elem.Name, "-", "_")
if metricName == "" {
metricName = elemName
} else {
metricName = metricName + "_" + elemName
}
for key, value := range elem.Key {
labelKey := metricName + "_" + strings.ReplaceAll(key, "-", "_")
labels[labelKey] = value
}
}
return metricName, labels
}