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package config
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
"github.com/go-sql-driver/mysql"
"github.com/icinga/icingadb/pkg/icingadb"
"github.com/icinga/icingadb/pkg/logging"
"github.com/icinga/icingadb/pkg/utils"
"github.com/jmoiron/sqlx"
"github.com/jmoiron/sqlx/reflectx"
"github.com/lib/pq"
"github.com/pkg/errors"
"net"
"net/url"
"strconv"
"strings"
"time"
)
// Database defines database client configuration.
type Database struct {
Type string `yaml:"type" default:"mysql"`
Host string `yaml:"host"`
Port int `yaml:"port"`
Database string `yaml:"database"`
User string `yaml:"user"`
Password string `yaml:"password"`
TlsOptions TLS `yaml:",inline"`
Options icingadb.Options `yaml:"options"`
}
// Open prepares the DSN string and driver configuration,
// calls sqlx.Open, but returns *icingadb.DB.
func (d *Database) Open(logger *logging.Logger) (*icingadb.DB, error) {
var db *sqlx.DB
switch d.Type {
case "mysql":
config := mysql.NewConfig()
config.User = d.User
config.Passwd = d.Password
config.Logger = icingadb.MysqlFuncLogger(logger.Debug)
if d.isUnixAddr() {
config.Net = "unix"
config.Addr = d.Host
} else {
config.Net = "tcp"
port := d.Port
if port == 0 {
port = 3306
}
config.Addr = net.JoinHostPort(d.Host, fmt.Sprint(port))
}
config.DBName = d.Database
config.Timeout = time.Minute
config.Params = map[string]string{"sql_mode": "'TRADITIONAL,ANSI_QUOTES'"}
tlsConfig, err := d.TlsOptions.MakeConfig(d.Host)
if err != nil {
return nil, err
}
if tlsConfig != nil {
config.TLSConfig = "icingadb"
if err := mysql.RegisterTLSConfig(config.TLSConfig, tlsConfig); err != nil {
return nil, errors.Wrap(err, "can't register TLS config")
}
}
c, err := mysql.NewConnector(config)
if err != nil {
return nil, errors.Wrap(err, "can't open mysql database")
}
wsrepSyncWait := int64(d.Options.WsrepSyncWait)
setWsrepSyncWait := func(ctx context.Context, conn driver.Conn) error {
return setGaleraOpts(ctx, conn, wsrepSyncWait)
}
db = sqlx.NewDb(sql.OpenDB(icingadb.NewConnector(c, logger, setWsrepSyncWait)), icingadb.MySQL)
case "pgsql":
uri := &url.URL{
Scheme: "postgres",
User: url.UserPassword(d.User, d.Password),
Path: "/" + url.PathEscape(d.Database),
}
query := url.Values{
"connect_timeout": {"60"},
"binary_parameters": {"yes"},
// Host and port can alternatively be specified in the query string. lib/pq can't parse the connection URI
// if a Unix domain socket path is specified in the host part of the URI, therefore always use the query
// string. See also https://github.com/lib/pq/issues/796
"host": {d.Host},
}
if d.Port != 0 {
query["port"] = []string{strconv.FormatInt(int64(d.Port), 10)}
}
if _, err := d.TlsOptions.MakeConfig(d.Host); err != nil {
return nil, err
}
if d.TlsOptions.Enable {
if d.TlsOptions.Insecure {
query["sslmode"] = []string{"require"}
} else {
query["sslmode"] = []string{"verify-full"}
}
if d.TlsOptions.Cert != "" {
query["sslcert"] = []string{d.TlsOptions.Cert}
}
if d.TlsOptions.Key != "" {
query["sslkey"] = []string{d.TlsOptions.Key}
}
if d.TlsOptions.Ca != "" {
query["sslrootcert"] = []string{d.TlsOptions.Ca}
}
} else {
query["sslmode"] = []string{"disable"}
}
uri.RawQuery = query.Encode()
connector, err := pq.NewConnector(uri.String())
if err != nil {
return nil, errors.Wrap(err, "can't open pgsql database")
}
db = sqlx.NewDb(sql.OpenDB(icingadb.NewConnector(connector, logger, nil)), icingadb.PostgreSQL)
default:
return nil, unknownDbType(d.Type)
}
db.SetMaxIdleConns(d.Options.MaxConnections / 3)
db.SetMaxOpenConns(d.Options.MaxConnections)
db.Mapper = reflectx.NewMapperFunc("db", func(s string) string {
return utils.Key(s, '_')
})
return icingadb.NewDb(db, logger, &d.Options), nil
}
// Validate checks constraints in the supplied database configuration and returns an error if they are violated.
func (d *Database) Validate() error {
switch d.Type {
case "mysql", "pgsql":
default:
return unknownDbType(d.Type)
}
if d.Host == "" {
return errors.New("database host missing")
}
if d.User == "" {
return errors.New("database user missing")
}
if d.Database == "" {
return errors.New("database name missing")
}
return d.Options.Validate()
}
func (d *Database) isUnixAddr() bool {
return strings.HasPrefix(d.Host, "/")
}
func unknownDbType(t string) error {
return errors.Errorf(`unknown database type %q, must be one of: "mysql", "pgsql"`, t)
}
// setGaleraOpts sets the "wsrep_sync_wait" variable for each session ensures that causality checks are performed
// before execution and that each statement is executed on a fully synchronized node. Doing so prevents foreign key
// violation when inserting into dependent tables on different MariaDB/MySQL nodes. When using MySQL single nodes,
// the "SET SESSION" command will fail with "Unknown system variable (1193)" and will therefore be silently dropped.
//
// https://mariadb.com/kb/en/galera-cluster-system-variables/#wsrep_sync_wait
func setGaleraOpts(ctx context.Context, conn driver.Conn, wsrepSyncWait int64) error {
const galeraOpts = "SET SESSION wsrep_sync_wait=?"
stmt, err := conn.(driver.ConnPrepareContext).PrepareContext(ctx, galeraOpts)
if err != nil {
if errors.Is(err, &mysql.MySQLError{Number: 1193}) { // Unknown system variable
return nil
}
return errors.Wrap(err, "cannot prepare "+galeraOpts)
}
// This is just for an unexpected exit and any returned error can safely be ignored and in case
// of the normal function exit, the stmt is closed manually, and its error is handled gracefully.
defer func() { _ = stmt.Close() }()
_, err = stmt.(driver.StmtExecContext).ExecContext(ctx, []driver.NamedValue{{Value: wsrepSyncWait}})
if err != nil {
return errors.Wrap(err, "cannot execute "+galeraOpts)
}
if err = stmt.Close(); err != nil {
return errors.Wrap(err, "cannot close prepared statement "+galeraOpts)
}
return nil
}
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