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forgejo/modules/setting/database.go
Gusted 6546dd1fc9
[GITEA] Add slow SQL query warning
- Databases are one of the most important parts of Forgejo, every
interaction with Forgejo uses the database in one way or another.
Therefore, it is important to maintain the database and recognize when
Forgejo is not doing well with the database. Forgejo already has the
option to log *every* SQL query along with its execution time, but
monitoring becomes impractical for larger instances and takes up
unnecessary storage in the logs.
- Add a QoL enhancement that allows instance administrators to specify a
threshold value beyond which query execution time is logged as a warning
in the xorm logger. The default value is a conservative five seconds to
avoid this becoming a source of spam in the logs.
- The use case for this patch is that with an instance the size of Codeberg, monitoring SQL logs is not very fruitful and most of them are uninteresting. Recently, in the context of persistent deadlock issues (https://codeberg.org/forgejo/forgejo/issues/220), I have noticed that certain queries hold locks on tables like comment and issue for several seconds. This patch helps to identify which queries these are and when they happen.
- Added unit test.

(cherry picked from commit 24bbe7886f)
(cherry picked from commit 6e29145b3c)
(cherry picked from commit 63731e3071)
(cherry picked from commit 3ce1a09736)
(cherry picked from commit a64426907d)
(cherry picked from commit 4b19215691)
(cherry picked from commit e635674435)
(cherry picked from commit 9cf501f1af)
(cherry picked from commit 0d6b934eba)
(cherry picked from commit 4b6c273879)
(cherry picked from commit b50517139c)
2023-10-23 15:35:32 +02:00

212 lines
6.7 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"errors"
"fmt"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"time"
)
var (
// SupportedDatabaseTypes includes all XORM supported databases type, sqlite3 maybe added by `database_sqlite3.go`
SupportedDatabaseTypes = []string{"mysql", "postgres", "mssql"}
// DatabaseTypeNames contains the friendly names for all database types
DatabaseTypeNames = map[string]string{"mysql": "MySQL", "postgres": "PostgreSQL", "mssql": "MSSQL", "sqlite3": "SQLite3"}
// EnableSQLite3 use SQLite3, set by build flag
EnableSQLite3 bool
// Database holds the database settings
Database = struct {
Type DatabaseType
Host string
Name string
User string
Passwd string
Schema string
SSLMode string
Path string
LogSQL bool
MysqlCharset string
Timeout int // seconds
SQLiteJournalMode string
DBConnectRetries int
DBConnectBackoff time.Duration
MaxIdleConns int
MaxOpenConns int
ConnMaxLifetime time.Duration
IterateBufferSize int
AutoMigration bool
SlowQueryTreshold time.Duration
}{
Timeout: 500,
IterateBufferSize: 50,
}
)
// LoadDBSetting loads the database settings
func LoadDBSetting() {
loadDBSetting(CfgProvider)
}
func loadDBSetting(rootCfg ConfigProvider) {
sec := rootCfg.Section("database")
Database.Type = DatabaseType(sec.Key("DB_TYPE").String())
Database.Host = sec.Key("HOST").String()
Database.Name = sec.Key("NAME").String()
Database.User = sec.Key("USER").String()
if len(Database.Passwd) == 0 {
Database.Passwd = sec.Key("PASSWD").String()
}
Database.Schema = sec.Key("SCHEMA").String()
Database.SSLMode = sec.Key("SSL_MODE").MustString("disable")
Database.MysqlCharset = sec.Key("MYSQL_CHARSET").MustString("utf8mb4") // do not document it, end users won't need it.
Database.Path = sec.Key("PATH").MustString(filepath.Join(AppDataPath, "gitea.db"))
Database.Timeout = sec.Key("SQLITE_TIMEOUT").MustInt(500)
Database.SQLiteJournalMode = sec.Key("SQLITE_JOURNAL_MODE").MustString("")
Database.MaxIdleConns = sec.Key("MAX_IDLE_CONNS").MustInt(2)
if Database.Type.IsMySQL() {
Database.ConnMaxLifetime = sec.Key("CONN_MAX_LIFETIME").MustDuration(3 * time.Second)
} else {
Database.ConnMaxLifetime = sec.Key("CONN_MAX_LIFETIME").MustDuration(0)
}
Database.MaxOpenConns = sec.Key("MAX_OPEN_CONNS").MustInt(0)
Database.IterateBufferSize = sec.Key("ITERATE_BUFFER_SIZE").MustInt(50)
Database.LogSQL = sec.Key("LOG_SQL").MustBool(false)
Database.DBConnectRetries = sec.Key("DB_RETRIES").MustInt(10)
Database.DBConnectBackoff = sec.Key("DB_RETRY_BACKOFF").MustDuration(3 * time.Second)
Database.AutoMigration = sec.Key("AUTO_MIGRATION").MustBool(true)
Database.SlowQueryTreshold = sec.Key("SLOW_QUERY_TRESHOLD").MustDuration(5 * time.Second)
}
// DBConnStr returns database connection string
func DBConnStr() (string, error) {
var connStr string
paramSep := "?"
if strings.Contains(Database.Name, paramSep) {
paramSep = "&"
}
switch Database.Type {
case "mysql":
connType := "tcp"
if len(Database.Host) > 0 && Database.Host[0] == '/' { // looks like a unix socket
connType = "unix"
}
tls := Database.SSLMode
if tls == "disable" { // allow (Postgres-inspired) default value to work in MySQL
tls = "false"
}
connStr = fmt.Sprintf("%s:%s@%s(%s)/%s%scharset=%s&parseTime=true&tls=%s",
Database.User, Database.Passwd, connType, Database.Host, Database.Name, paramSep, Database.MysqlCharset, tls)
case "postgres":
connStr = getPostgreSQLConnectionString(Database.Host, Database.User, Database.Passwd, Database.Name, paramSep, Database.SSLMode)
case "mssql":
host, port := ParseMSSQLHostPort(Database.Host)
connStr = fmt.Sprintf("server=%s; port=%s; database=%s; user id=%s; password=%s;", host, port, Database.Name, Database.User, Database.Passwd)
case "sqlite3":
if !EnableSQLite3 {
return "", errors.New("this Gitea binary was not built with SQLite3 support")
}
if err := os.MkdirAll(path.Dir(Database.Path), os.ModePerm); err != nil {
return "", fmt.Errorf("Failed to create directories: %w", err)
}
journalMode := ""
if Database.SQLiteJournalMode != "" {
journalMode = "&_journal_mode=" + Database.SQLiteJournalMode
}
connStr = fmt.Sprintf("file:%s?cache=shared&mode=rwc&_busy_timeout=%d&_txlock=immediate%s",
Database.Path, Database.Timeout, journalMode)
default:
return "", fmt.Errorf("unknown database type: %s", Database.Type)
}
return connStr, nil
}
// parsePostgreSQLHostPort parses given input in various forms defined in
// https://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING
// and returns proper host and port number.
func parsePostgreSQLHostPort(info string) (string, string) {
host, port := "127.0.0.1", "5432"
if strings.Contains(info, ":") && !strings.HasSuffix(info, "]") {
idx := strings.LastIndex(info, ":")
host = info[:idx]
port = info[idx+1:]
} else if len(info) > 0 {
host = info
}
if host == "" {
host = "127.0.0.1"
}
if port == "" {
port = "5432"
}
return host, port
}
func getPostgreSQLConnectionString(dbHost, dbUser, dbPasswd, dbName, dbParam, dbsslMode string) (connStr string) {
host, port := parsePostgreSQLHostPort(dbHost)
if host[0] == '/' { // looks like a unix socket
connStr = fmt.Sprintf("postgres://%s:%s@:%s/%s%ssslmode=%s&host=%s",
url.PathEscape(dbUser), url.PathEscape(dbPasswd), port, dbName, dbParam, dbsslMode, host)
} else {
connStr = fmt.Sprintf("postgres://%s:%s@%s:%s/%s%ssslmode=%s",
url.PathEscape(dbUser), url.PathEscape(dbPasswd), host, port, dbName, dbParam, dbsslMode)
}
return connStr
}
// ParseMSSQLHostPort splits the host into host and port
func ParseMSSQLHostPort(info string) (string, string) {
// the default port "0" might be related to MSSQL's dynamic port, maybe it should be double-confirmed in the future
host, port := "127.0.0.1", "0"
if strings.Contains(info, ":") {
host = strings.Split(info, ":")[0]
port = strings.Split(info, ":")[1]
} else if strings.Contains(info, ",") {
host = strings.Split(info, ",")[0]
port = strings.TrimSpace(strings.Split(info, ",")[1])
} else if len(info) > 0 {
host = info
}
if host == "" {
host = "127.0.0.1"
}
if port == "" {
port = "0"
}
return host, port
}
type DatabaseType string
func (t DatabaseType) String() string {
return string(t)
}
func (t DatabaseType) IsSQLite3() bool {
return t == "sqlite3"
}
func (t DatabaseType) IsMySQL() bool {
return t == "mysql"
}
func (t DatabaseType) IsMSSQL() bool {
return t == "mssql"
}
func (t DatabaseType) IsPostgreSQL() bool {
return t == "postgres"
}