mirror of
https://github.com/prometheus-community/postgres_exporter
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713461df98
- Remove multi server support from new collector package - Add http handler for multi-target support Signed-off-by: Joe Adams <github@joeadams.io>
91 lines
2.2 KiB
Go
91 lines
2.2 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 collector
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import (
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"context"
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"database/sql"
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"fmt"
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"strings"
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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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)
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type ProbeCollector struct {
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registry *prometheus.Registry
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collectors map[string]Collector
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logger log.Logger
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db *sql.DB
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}
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func NewProbeCollector(logger log.Logger, registry *prometheus.Registry, dsn string) (*ProbeCollector, error) {
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collectors := make(map[string]Collector)
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initiatedCollectorsMtx.Lock()
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defer initiatedCollectorsMtx.Unlock()
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for key, enabled := range collectorState {
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// TODO: Handle filters
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// if !*enabled || (len(f) > 0 && !f[key]) {
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// continue
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// }
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if !*enabled {
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continue
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}
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if collector, ok := initiatedCollectors[key]; ok {
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collectors[key] = collector
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} else {
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collector, err := factories[key](log.With(logger, "collector", key))
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if err != nil {
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return nil, err
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}
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collectors[key] = collector
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initiatedCollectors[key] = collector
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}
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}
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if !strings.HasPrefix(dsn, "postgres://") {
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dsn = fmt.Sprintf("postgres://%s", dsn)
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}
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db, err := sql.Open("postgres", dsn)
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if err != nil {
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return nil, err
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}
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db.SetMaxOpenConns(1)
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db.SetMaxIdleConns(1)
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return &ProbeCollector{
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registry: registry,
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collectors: collectors,
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logger: logger,
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db: db,
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}, nil
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}
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func (pc *ProbeCollector) Describe(ch chan<- *prometheus.Desc) {
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}
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func (pc *ProbeCollector) Collect(ch chan<- prometheus.Metric) {
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wg := sync.WaitGroup{}
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wg.Add(len(pc.collectors))
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for name, c := range pc.collectors {
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go func(name string, c Collector) {
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execute(context.TODO(), name, c, pc.db, ch, pc.logger)
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wg.Done()
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}(name, c)
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}
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wg.Wait()
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}
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