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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 main
import (
"fmt"
"log/slog"
"net/http"
"github.com/prometheus-community/postgres_exporter/collector"
"github.com/prometheus-community/postgres_exporter/config"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
func handleProbe(logger *slog.Logger, excludeDatabases []string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
conf := c.GetConfig()
params := r.URL.Query()
target := params.Get("target")
if target == "" {
http.Error(w, "target is required", http.StatusBadRequest)
return
}
var authModule config.AuthModule
authModuleName := params.Get("auth_module")
if authModuleName == "" {
logger.Info("no auth_module specified, using default")
} else {
var ok bool
authModule, ok = conf.AuthModules[authModuleName]
if !ok {
http.Error(w, fmt.Sprintf("auth_module %s not found", authModuleName), http.StatusBadRequest)
return
}
if authModule.UserPass.Username == "" || authModule.UserPass.Password == "" {
http.Error(w, fmt.Sprintf("auth_module %s has no username or password", authModuleName), http.StatusBadRequest)
return
}
}
dsn, err := authModule.ConfigureTarget(target)
if err != nil {
logger.Error("failed to configure target", "err", err)
http.Error(w, fmt.Sprintf("could not configure dsn for target: %v", err), http.StatusBadRequest)
return
}
// TODO(@sysadmind): Timeout
tl := logger.With("target", target)
registry := prometheus.NewRegistry()
opts := []ExporterOpt{
DisableDefaultMetrics(*disableDefaultMetrics),
DisableSettingsMetrics(*disableSettingsMetrics),
AutoDiscoverDatabases(*autoDiscoverDatabases),
WithUserQueriesPath(*queriesPath),
WithConstantLabels(*constantLabelsList),
ExcludeDatabases(excludeDatabases),
IncludeDatabases(*includeDatabases),
}
dsns := []string{dsn.GetConnectionString()}
exporter := NewExporter(dsns, opts...)
defer func() {
exporter.servers.Close()
}()
registry.MustRegister(exporter)
// Run the probe
pc, err := collector.NewProbeCollector(tl, excludeDatabases, registry, dsn)
if err != nil {
logger.Error("Error creating probe collector", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Cleanup underlying connections to prevent connection leaks
defer pc.Close()
// TODO(@sysadmind): Remove the registry.MustRegister() call below and instead handle the collection here. That will allow
// for the passing of context, handling of timeouts, and more control over the collection.
// The current NewProbeCollector() implementation relies on the MustNewConstMetric() call to create the metrics which is not
// ideal to use without the registry.MustRegister() call.
_ = ctx
registry.MustRegister(pc)
// TODO check success, etc
h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
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