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