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Files
mysqld_exporter/collector/info_schema_tables.go
2024-11-08 15:15:02 +01:00

189 lines
5.1 KiB
Go

// Copyright 2018 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.
// Scrape `information_schema.tables`.
package collector
import (
"context"
"fmt"
"log/slog"
"strings"
"github.com/alecthomas/kingpin/v2"
"github.com/prometheus/client_golang/prometheus"
)
const (
tableSchemaQuery = `
SELECT
TABLE_SCHEMA,
TABLE_NAME,
TABLE_TYPE,
ifnull(ENGINE, 'NONE') as ENGINE,
ifnull(VERSION, '0') as VERSION,
ifnull(ROW_FORMAT, 'NONE') as ROW_FORMAT,
ifnull(TABLE_ROWS, '0') as TABLE_ROWS,
ifnull(DATA_LENGTH, '0') as DATA_LENGTH,
ifnull(INDEX_LENGTH, '0') as INDEX_LENGTH,
ifnull(DATA_FREE, '0') as DATA_FREE,
ifnull(CREATE_OPTIONS, 'NONE') as CREATE_OPTIONS
FROM information_schema.tables
WHERE TABLE_SCHEMA = '%s'
`
dbListQuery = `
SELECT
SCHEMA_NAME
FROM information_schema.schemata
WHERE SCHEMA_NAME NOT IN ('mysql', 'performance_schema', 'information_schema', 'sys')
`
)
// Tunable flags.
var (
tableSchemaDatabases = kingpin.Flag(
"collect.info_schema.tables.databases",
"The list of databases to collect table stats for, or '*' for all",
).Default("*").String()
)
// Metric descriptors.
var (
infoSchemaTablesVersionDesc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, informationSchema, "table_version"),
"The version number of the table's .frm file",
[]string{"schema", "table", "type", "engine", "row_format", "create_options"}, nil,
)
infoSchemaTablesRowsDesc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, informationSchema, "table_rows"),
"The estimated number of rows in the table from information_schema.tables",
[]string{"schema", "table"}, nil,
)
infoSchemaTablesSizeDesc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, informationSchema, "table_size"),
"The size of the table components from information_schema.tables",
[]string{"schema", "table", "component"}, nil,
)
)
// ScrapeTableSchema collects from `information_schema.tables`.
type ScrapeTableSchema struct{}
// Name of the Scraper. Should be unique.
func (ScrapeTableSchema) Name() string {
return informationSchema + ".tables"
}
// Help describes the role of the Scraper.
func (ScrapeTableSchema) Help() string {
return "Collect metrics from information_schema.tables"
}
// Version of MySQL from which scraper is available.
func (ScrapeTableSchema) Version() float64 {
return 5.1
}
// Scrape collects data from database connection and sends it over channel as prometheus metric.
func (ScrapeTableSchema) Scrape(ctx context.Context, instance *instance, ch chan<- prometheus.Metric, logger *slog.Logger) error {
var dbList []string
db := instance.getDB()
if *tableSchemaDatabases == "*" {
dbListRows, err := db.QueryContext(ctx, dbListQuery)
if err != nil {
return err
}
defer dbListRows.Close()
var database string
for dbListRows.Next() {
if err := dbListRows.Scan(
&database,
); err != nil {
return err
}
dbList = append(dbList, database)
}
} else {
dbList = strings.Split(*tableSchemaDatabases, ",")
}
for _, database := range dbList {
tableSchemaRows, err := db.QueryContext(ctx, fmt.Sprintf(tableSchemaQuery, database))
if err != nil {
return err
}
defer tableSchemaRows.Close()
var (
tableSchema string
tableName string
tableType string
engine string
version uint64
rowFormat string
tableRows uint64
dataLength uint64
indexLength uint64
dataFree uint64
createOptions string
)
for tableSchemaRows.Next() {
err = tableSchemaRows.Scan(
&tableSchema,
&tableName,
&tableType,
&engine,
&version,
&rowFormat,
&tableRows,
&dataLength,
&indexLength,
&dataFree,
&createOptions,
)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
infoSchemaTablesVersionDesc, prometheus.GaugeValue, float64(version),
tableSchema, tableName, tableType, engine, rowFormat, createOptions,
)
ch <- prometheus.MustNewConstMetric(
infoSchemaTablesRowsDesc, prometheus.GaugeValue, float64(tableRows),
tableSchema, tableName,
)
ch <- prometheus.MustNewConstMetric(
infoSchemaTablesSizeDesc, prometheus.GaugeValue, float64(dataLength),
tableSchema, tableName, "data_length",
)
ch <- prometheus.MustNewConstMetric(
infoSchemaTablesSizeDesc, prometheus.GaugeValue, float64(indexLength),
tableSchema, tableName, "index_length",
)
ch <- prometheus.MustNewConstMetric(
infoSchemaTablesSizeDesc, prometheus.GaugeValue, float64(dataFree),
tableSchema, tableName, "data_free",
)
}
}
return nil
}
// check interface
var _ Scraper = ScrapeTableSchema{}