mirror of
https://github.com/prometheus-community/json_exporter
synced 2024-12-25 07:52:30 +00:00
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package harness
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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log "github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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const DefaultMetricsPath = "/metrics"
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type ExporterOpts struct {
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// The representative name of exporter
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Name string
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// The version of exporter
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Version string
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// The HTTP endpoint path which used to provide metrics
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MetricsPath string
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// Whether to call Collect() of collector periodically
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Tick bool
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// Whether to reset all metrics per tick
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ResetOnTick bool
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// Command line usage
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Usage string
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// Additional command line flags which can be accepted
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Flags []cli.Flag
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// Function to instantiate collector
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Init func(*cli.Context, *MetricRegistry) (Collector, error)
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}
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func NewExporterOpts(name string, version string) *ExporterOpts {
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return &ExporterOpts{
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Name: name,
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Version: version,
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MetricsPath: DefaultMetricsPath,
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Tick: true,
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ResetOnTick: true,
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Usage: "",
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}
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}
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type exporter struct {
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*ExporterOpts
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}
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func setupLogging(c *cli.Context) {
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log.SetFormatter(&log.TextFormatter{
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FullTimestamp: true,
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})
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levelString := c.String("log-level")
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level, err := log.ParseLevel(levelString)
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if err != nil {
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log.Fatalf("could not set log level to '%s';err:<%s>", levelString, err)
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}
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log.SetLevel(level)
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}
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func (exp *exporter) main(c *cli.Context) {
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setupLogging(c)
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registry := newRegistry()
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collector, err := exp.Init(c, registry)
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if err != nil {
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log.Fatal(err)
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}
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if exp.Tick {
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collector.Collect(registry)
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interval := c.Int("interval")
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go func() {
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for range time.Tick(time.Duration(interval) * time.Second) {
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if exp.ResetOnTick {
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registry.Reset()
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}
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collector.Collect(registry)
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}
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}()
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}
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http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
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w.Header().Add("Location", exp.MetricsPath)
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w.WriteHeader(http.StatusFound)
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})
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http.Handle(exp.MetricsPath, promhttp.Handler())
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if err := http.ListenAndServe(fmt.Sprintf(":%d", c.Int("port")), nil); err != nil {
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log.Fatal(err)
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}
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}
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