121 lines
2.9 KiB
Go
121 lines
2.9 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 config
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import (
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"fmt"
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"os"
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"sync"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"gopkg.in/yaml.v3"
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)
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var (
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configReloadSuccess = promauto.NewGauge(prometheus.GaugeOpts{
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Namespace: "postgres_exporter",
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Name: "config_last_reload_successful",
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Help: "Postgres exporter config loaded successfully.",
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})
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configReloadSeconds = promauto.NewGauge(prometheus.GaugeOpts{
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Namespace: "postgres_exporter",
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Name: "config_last_reload_success_timestamp_seconds",
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Help: "Timestamp of the last successful configuration reload.",
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})
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)
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type Config struct {
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AuthModules map[string]AuthModule `yaml:"auth_modules"`
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}
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type AuthModule struct {
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Type string `yaml:"type"`
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UserPass UserPass `yaml:"userpass,omitempty"`
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// Add alternative auth modules here
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Options map[string]string `yaml:"options"`
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}
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type UserPass struct {
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Username string `yaml:"username"`
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Password string `yaml:"password"`
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}
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type Handler struct {
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sync.RWMutex
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Config *Config
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}
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func (ch *Handler) GetConfig() *Config {
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ch.RLock()
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defer ch.RUnlock()
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return ch.Config
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}
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func (ch *Handler) ReloadConfig(f string, logger log.Logger) error {
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config := &Config{}
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var err error
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defer func() {
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if err != nil {
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configReloadSuccess.Set(0)
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} else {
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configReloadSuccess.Set(1)
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configReloadSeconds.SetToCurrentTime()
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}
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}()
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yamlReader, err := os.Open(f)
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if err != nil {
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return fmt.Errorf("Error opening config file %q: %s", f, err)
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}
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defer yamlReader.Close()
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decoder := yaml.NewDecoder(yamlReader)
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decoder.KnownFields(true)
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if err = decoder.Decode(config); err != nil {
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return fmt.Errorf("Error parsing config file %q: %s", f, err)
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}
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ch.Lock()
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ch.Config = config
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ch.Unlock()
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return nil
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}
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func (m AuthModule) ConfigureTarget(target string) (DSN, error) {
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dsn, err := dsnFromString(target)
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if err != nil {
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return DSN{}, err
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}
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// Set the credentials from the authentication module
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// TODO(@sysadmind): What should the order of precedence be?
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if m.Type == "userpass" {
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if m.UserPass.Username != "" {
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dsn.username = m.UserPass.Username
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}
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if m.UserPass.Password != "" {
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dsn.password = m.UserPass.Password
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}
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}
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for k, v := range m.Options {
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dsn.query.Set(k, v)
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}
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return dsn, nil
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}
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