cc751b7966
The config module supports adding configuration to the exporter via a config file. This supports adding authentication details in a config file so that /probe requests can specify authentication for endpoints Signed-off-by: Joe Adams <github@joeadams.io>
114 lines
3.5 KiB
Go
114 lines
3.5 KiB
Go
// Copyright 2022 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 main
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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/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus-community/postgres_exporter/collector"
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"github.com/prometheus-community/postgres_exporter/config"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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func handleProbe(logger log.Logger) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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conf := c.GetConfig()
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params := r.URL.Query()
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target := params.Get("target")
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if target == "" {
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http.Error(w, "target is required", http.StatusBadRequest)
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return
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}
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var authModule config.AuthModule
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authModuleName := params.Get("auth_module")
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if authModuleName == "" {
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level.Info(logger).Log("msg", "no auth_module specified, using default")
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} else {
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var ok bool
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authModule, ok = conf.AuthModules[authModuleName]
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if !ok {
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http.Error(w, fmt.Sprintf("auth_module %s not found", authModuleName), http.StatusBadRequest)
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return
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}
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if authModule.UserPass.Username == "" || authModule.UserPass.Password == "" {
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http.Error(w, fmt.Sprintf("auth_module %s has no username or password", authModuleName), http.StatusBadRequest)
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return
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}
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}
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dsn, err := authModule.ConfigureTarget(target)
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if err != nil {
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level.Error(logger).Log("msg", "failed to configure target", "err", err)
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http.Error(w, fmt.Sprintf("could not configure dsn for target: %v", err), http.StatusBadRequest)
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return
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}
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// TODO: Timeout
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probeSuccessGauge := prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "probe_success",
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Help: "Displays whether or not the probe was a success",
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})
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probeDurationGauge := prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "probe_duration_seconds",
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Help: "Returns how long the probe took to complete in seconds",
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})
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tl := log.With(logger, "target", target)
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start := time.Now()
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registry := prometheus.NewRegistry()
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registry.MustRegister(probeSuccessGauge)
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registry.MustRegister(probeDurationGauge)
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// Run the probe
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pc, err := collector.NewProbeCollector(tl, registry, dsn)
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if err != nil {
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probeSuccessGauge.Set(0)
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probeDurationGauge.Set(time.Since(start).Seconds())
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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_ = ctx
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// TODO: Which way should this be? Register or handle the collection manually?
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// Also, what about the context?
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// Option 1: Register the collector
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registry.MustRegister(pc)
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// Option 2: Handle the collection manually. This allows us to collect duration metrics.
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// The collectors themselves already support their own duration metrics.
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// err = pc.Update(ctx)
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// if err != nil {
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// probeSuccessGauge.Set(0)
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// } else {
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// probeSuccessGauge.Set(1)
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// }
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duration := time.Since(start).Seconds()
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probeDurationGauge.Set(duration)
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// TODO check success, etc
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h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
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h.ServeHTTP(w, r)
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}
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}
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