mirror of
https://github.com/prometheus-community/postgres_exporter
synced 2025-01-10 00:09:26 +00:00
c3b0206369
Uses node_exporter style collector registration Signed-off-by: Joe Adams <github@joeadams.io>
101 lines
2.0 KiB
Go
101 lines
2.0 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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"database/sql"
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"fmt"
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"strings"
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"github.com/lib/pq"
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)
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type server struct {
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dsn string
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name string
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db *sql.DB
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}
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func makeServer(dsn string) (*server, error) {
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name, err := parseServerName(dsn)
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if err != nil {
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return nil, err
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}
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return &server{
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dsn: dsn,
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name: name,
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}, nil
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}
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func (s *server) GetDB() (*sql.DB, error) {
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if s.db != nil {
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return s.db, nil
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}
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db, err := sql.Open("postgres", s.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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s.db = db
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return s.db, nil
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}
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func (s *server) GetName() string {
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return s.name
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}
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func (s *server) String() string {
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return s.name
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}
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func parseServerName(url string) (string, error) {
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dsn, err := pq.ParseURL(url)
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if err != nil {
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dsn = url
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}
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pairs := strings.Split(dsn, " ")
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kv := make(map[string]string, len(pairs))
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for _, pair := range pairs {
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splitted := strings.SplitN(pair, "=", 2)
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if len(splitted) != 2 {
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return "", fmt.Errorf("malformed dsn %q", dsn)
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}
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// Newer versions of pq.ParseURL quote values so trim them off if they exist
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key := strings.Trim(splitted[0], "'\"")
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value := strings.Trim(splitted[1], "'\"")
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kv[key] = value
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}
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var fingerprint string
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if host, ok := kv["host"]; ok {
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fingerprint += host
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} else {
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fingerprint += "localhost"
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}
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if port, ok := kv["port"]; ok {
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fingerprint += ":" + port
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} else {
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fingerprint += ":5432"
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}
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return fingerprint, nil
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}
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