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// Copyright 2021 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 exporter
import (
"fmt"
"net/url"
"os"
"regexp"
"slices"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
func (e *Exporter) discoverDatabaseDSNs() []string {
// connstring syntax is complex (and not sure if even regular).
// we don't need to parse it, so just superficially validate that it starts
// with a valid-ish keyword pair
connstringRe := regexp.MustCompile(`^ *[a-zA-Z0-9]+ *= *[^= ]+`)
dsns := make(map[string]struct{})
for _, dsn := range e.dsn {
var dsnURI *url.URL
var dsnConnstring string
if strings.HasPrefix(dsn, "postgresql://") || strings.HasPrefix(dsn, "postgres://") {
var err error
dsnURI, err = url.Parse(dsn)
if err != nil {
e.logger.Error("Unable to parse DSN as URI", "dsn", loggableDSN(dsn), "err", err)
continue
}
} else if connstringRe.MatchString(dsn) {
dsnConnstring = dsn
} else {
e.logger.Error("Unable to parse DSN as either URI or connstring", "dsn", loggableDSN(dsn))
continue
}
server, err := e.servers.GetServer(dsn)
if err != nil {
e.logger.Error("Error opening connection to database", "dsn", loggableDSN(dsn), "err", err)
continue
}
dsns[dsn] = struct{}{}
// If autoDiscoverDatabases is true, set first dsn as master database (Default: false)
server.master = true
databaseNames, err := queryDatabases(server)
if err != nil {
e.logger.Error("Error querying databases", "dsn", loggableDSN(dsn), "err", err)
continue
}
for _, databaseName := range databaseNames {
if slices.Contains(e.excludeDatabases, databaseName) {
continue
}
if len(e.includeDatabases) != 0 && !slices.Contains(e.includeDatabases, databaseName) {
continue
}
if dsnURI != nil {
dsnURI.Path = databaseName
dsn = dsnURI.String()
} else {
// replacing one dbname with another is complicated.
// just append new dbname to override.
dsn = fmt.Sprintf("%s dbname=%s", dsnConnstring, databaseName)
}
dsns[dsn] = struct{}{}
}
}
result := make([]string, len(dsns))
index := 0
for dsn := range dsns {
result[index] = dsn
index++
}
return result
}
func (e *Exporter) scrapeDSN(ch chan<- prometheus.Metric, dsn string) error {
server, err := e.servers.GetServer(dsn)
if err != nil {
return &ErrorConnectToServer{fmt.Sprintf("Error opening connection to database (%s): %s", loggableDSN(dsn), err.Error())}
}
// Check if autoDiscoverDatabases is false, set dsn as master database (Default: false)
if !e.autoDiscoverDatabases {
server.master = true
}
// Check if map versions need to be updated
if err := e.checkMapVersions(ch, server); err != nil {
e.logger.Warn("Proceeding with outdated query maps, as the Postgres version could not be determined", "err", err)
}
return server.Scrape(ch, e.disableSettingsMetrics)
}
// try to get the DataSource
// DATA_SOURCE_NAME always wins so we do not break older versions
// reading secrets from files wins over secrets in environment variables
// DATA_SOURCE_NAME > DATA_SOURCE_{USER|PASS}_FILE > DATA_SOURCE_{USER|PASS}
func GetDataSources() ([]string, error) {
var dsn = os.Getenv("DATA_SOURCE_NAME")
if len(dsn) != 0 {
return strings.Split(dsn, ","), nil
}
var user, pass, uri string
dataSourceUserFile := os.Getenv("DATA_SOURCE_USER_FILE")
if len(dataSourceUserFile) != 0 {
fileContents, err := os.ReadFile(dataSourceUserFile)
if err != nil {
return nil, fmt.Errorf("failed loading data source user file %s: %s", dataSourceUserFile, err.Error())
}
user = strings.TrimSpace(string(fileContents))
} else {
user = os.Getenv("DATA_SOURCE_USER")
}
dataSourcePassFile := os.Getenv("DATA_SOURCE_PASS_FILE")
if len(dataSourcePassFile) != 0 {
fileContents, err := os.ReadFile(dataSourcePassFile)
if err != nil {
return nil, fmt.Errorf("failed loading data source pass file %s: %s", dataSourcePassFile, err.Error())
}
pass = strings.TrimSpace(string(fileContents))
} else {
pass = os.Getenv("DATA_SOURCE_PASS")
}
ui := url.UserPassword(user, pass).String()
dataSrouceURIFile := os.Getenv("DATA_SOURCE_URI_FILE")
if len(dataSrouceURIFile) != 0 {
fileContents, err := os.ReadFile(dataSrouceURIFile)
if err != nil {
return nil, fmt.Errorf("failed loading data source URI file %s: %s", dataSrouceURIFile, err.Error())
}
uri = strings.TrimSpace(string(fileContents))
} else {
uri = os.Getenv("DATA_SOURCE_URI")
}
// No datasources found. This allows us to support the multi-target pattern
// without an explicit datasource.
if uri == "" {
return []string{}, nil
}
dsn = "postgresql://" + ui + "@" + uri
return []string{dsn}, nil
}
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