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Add --exclude-databases option (#298)

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* Add exclude-databases option
* Update readme to explain --exclude-databases
* Add comments to ExcludeDatabases function and unexport Contains function
This commit is contained in:
Alexis Sellier 2019-08-12 03:25:01 +02:00 committed by Will Rouesnel
parent 5f3a711ebd
commit c768e64548
3 changed files with 25 additions and 1 deletions
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2
README.md
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@ -166,6 +166,8 @@ To scrape metrics from all databases on a database server, the database DSN's ca
`--auto-discover-databases` flag. When true, `SELECT datname FROM pg_database` is run for all configured DSN's. From the
result a new set of DSN's is created for which the metrics are scraped.
In addition, the option `--exclude-databases` adds the possibily to filter the result from the auto discovery to discard databases you do not need.
### Running as non-superuser
To be able to collect metrics from `pg_stat_activity` and `pg_stat_replication`

22
cmd/postgres_exporter/postgres_exporter.go
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@ -39,6 +39,7 @@ var (
queriesPath = kingpin.Flag("extend.query-path", "Path to custom queries to run.").Default("").Envar("PG_EXPORTER_EXTEND_QUERY_PATH").String()
onlyDumpMaps = kingpin.Flag("dumpmaps", "Do not run, simply dump the maps.").Bool()
constantLabelsList = kingpin.Flag("constantLabels", "A list of label=value separated by comma(,).").Default("").Envar("PG_EXPORTER_CONSTANT_LABELS").String()
excludeDatabases = kingpin.Flag("exclude-databases", "A list of databases to remove when autoDiscoverDatabases is enabled").Default("").Envar("PG_EXPORTER_EXCLUDE_DATABASES").String()
)
// Metric name parts.
@ -883,6 +884,7 @@ type Exporter struct {
disableDefaultMetrics, disableSettingsMetrics, autoDiscoverDatabases bool
excludeDatabases []string
dsn []string
userQueriesPath string
constantLabels prometheus.Labels
@ -921,6 +923,13 @@ func AutoDiscoverDatabases(b bool) ExporterOpt {
}
}
// ExcludeDatabases allows to filter out result from AutoDiscoverDatabases
func ExcludeDatabases(s string) ExporterOpt {
return func(e *Exporter) {
e.excludeDatabases = strings.Split(s, ",")
}
}
// WithUserQueriesPath configures user's queries path.
func WithUserQueriesPath(p string) ExporterOpt {
return func(e *Exporter) {
@ -1315,6 +1324,9 @@ func (e *Exporter) discoverDatabaseDSNs() []string {
continue
}
for _, databaseName := range databaseNames {
if contains(e.excludeDatabases, databaseName) {
continue
}
parsedDSN.Path = databaseName
dsns[parsedDSN.String()] = struct{}{}
}
@ -1389,6 +1401,15 @@ func getDataSources() []string {
return strings.Split(dsn, ",")
}
func contains(a []string, x string) bool {
for _, n := range a {
if x == n {
return true
}
}
return false
}
func main() {
kingpin.Version(fmt.Sprintf("postgres_exporter %s (built with %s)\n", Version, runtime.Version()))
log.AddFlags(kingpin.CommandLine)
@ -1421,6 +1442,7 @@ func main() {
AutoDiscoverDatabases(*autoDiscoverDatabases),
WithUserQueriesPath(*queriesPath),
WithConstantLabels(*constantLabelsList),
ExcludeDatabases(*excludeDatabases),
)
defer func() {
exporter.servers.Close()

2
tools/src
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@ -1 +1 @@
/home/will/src/go/src/github.com/wrouesnel/postgres_exporter/tools/vendor
/Users/alex/go/src/github.com/AlexisSellier/postgres_exporter/tools/vendor