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mysql.go
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mysql.go
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// Initial code generated by generator.
package mysql
import (
"context"
"database/sql"
"fmt"
"strconv"
"github.com/pkg/errors"
_ "github.com/go-sql-driver/mysql"
"github.com/mattermost/morph/drivers"
"github.com/mattermost/morph/models"
)
const driverName = "mysql"
const defaultMigrationMaxSize = 10 * 1 << 20 // 10 MB
// add here any custom driver configuration
var configParams = []string{
"x-migration-max-size",
"x-migrations-table",
"x-statement-timeout",
}
type driverConfig struct {
drivers.Config
databaseName string
closeDBonClose bool
}
type mysql struct {
conn *sql.Conn
db *sql.DB
config *driverConfig
}
func WithInstance(dbInstance *sql.DB) (drivers.Driver, error) {
driverConfig := getDefaultConfig()
conn, err := dbInstance.Conn(context.Background())
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "grabbing_connection", OrigErr: err, Message: "failed to grab connection to the database"}
}
if driverConfig.databaseName, err = currentDatabaseNameFromDB(conn, driverConfig); err != nil {
return nil, err
}
return &mysql{config: driverConfig, conn: conn, db: dbInstance}, nil
}
func Open(connURL string) (drivers.Driver, error) {
customParams, err := drivers.ExtractCustomParams(connURL, configParams)
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to parse custom parameters from url"}
}
sanitizedConnURL, err := drivers.RemoveParamsFromURL(connURL, configParams)
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to sanitize url from custom parameters"}
}
driverConfig, err := mergeConfigWithParams(customParams, getDefaultConfig())
if err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to merge custom params to driver config"}
}
db, err := sql.Open(driverName, sanitizedConnURL)
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "opening_connection", OrigErr: err, Message: "failed to open connection with the database"}
}
conn, err := db.Conn(context.Background())
if err != nil {
return nil, &drivers.DatabaseError{Driver: driverName, Command: "grabbing_connection", OrigErr: err, Message: "failed to grab connection to the database"}
}
if driverConfig.databaseName, err = extractDatabaseNameFromURL(sanitizedConnURL); err != nil {
return nil, &drivers.AppError{Driver: driverName, OrigErr: err, Message: "failed to extract database name from connection url"}
}
driverConfig.closeDBonClose = true
return &mysql{
conn: conn,
db: db,
config: driverConfig,
}, nil
}
func (driver *mysql) Ping() error {
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
return driver.conn.PingContext(ctx)
}
func (mysql) DriverName() string {
return driverName
}
func (driver *mysql) Close() error {
if driver.conn != nil {
if err := driver.conn.Close(); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to close database connection",
Command: "mysql_conn_close",
Query: nil,
}
}
}
if driver.db != nil && driver.config.closeDBonClose {
if err := driver.db.Close(); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to close database",
Command: "mysql_db_close",
Query: nil,
}
}
driver.db = nil
}
driver.conn = nil
return nil
}
func (driver *mysql) createSchemaTableIfNotExists() (err error) {
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
createTableIfNotExistsQuery := fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (Version bigint(20) NOT NULL, Name varchar(64) NOT NULL, PRIMARY KEY (Version)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4", driver.config.MigrationsTable)
if _, err = driver.conn.ExecContext(ctx, createTableIfNotExistsQuery); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed while executing query",
Command: "create_migrations_table_if_not_exists",
Query: []byte(createTableIfNotExistsQuery),
}
}
return nil
}
func (driver *mysql) Apply(migration *models.Migration, saveVersion bool) (err error) {
query := migration.Query()
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
if _, err := driver.conn.ExecContext(ctx, query); err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed when applying migration",
Command: "apply_migration",
Query: []byte(query),
}
}
updateVersionContext, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
if !saveVersion {
return nil
}
updateVersionQuery := driver.addMigrationQuery(migration)
res, err := driver.conn.ExecContext(updateVersionContext, updateVersionQuery)
if err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed when updating migrations table with the new version",
Command: "update_version",
Query: []byte(updateVersionQuery),
}
}
affected, err := res.RowsAffected()
if err != nil {
return &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed when reading the result for migrations table with the new version",
Command: "update_version",
Query: []byte(updateVersionQuery),
}
}
if affected == 0 {
return &drivers.DatabaseError{
OrigErr: sql.ErrNoRows,
Driver: driverName,
Message: "could not update version, probably a version mismatch",
Command: "update_version",
Query: []byte(updateVersionQuery),
}
}
return nil
}
func (driver *mysql) AppliedMigrations() (migrations []*models.Migration, err error) {
if driver.conn == nil {
return nil, &drivers.AppError{
OrigErr: errors.New("driver has no connection established"),
Message: "database connection is missing",
Driver: driverName,
}
}
if err := driver.createSchemaTableIfNotExists(); err != nil {
return nil, err
}
query := fmt.Sprintf("SELECT version, name FROM %s", driver.config.MigrationsTable)
ctx, cancel := drivers.GetContext(driver.config.StatementTimeoutInSecs)
defer cancel()
var appliedMigrations []*models.Migration
var version uint32
var name string
rows, err := driver.conn.QueryContext(ctx, query)
if err != nil {
return nil, &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to fetch applied migrations",
Command: "select_applied_migrations",
Query: []byte(query),
}
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&version, &name); err != nil {
return nil, &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to scan applied migration row",
Command: "scan_applied_migrations",
}
}
appliedMigrations = append(appliedMigrations, &models.Migration{
Name: name,
Version: version,
Direction: models.Up,
})
}
return appliedMigrations, nil
}
func currentDatabaseNameFromDB(conn *sql.Conn, config *driverConfig) (string, error) {
query := "SELECT DATABASE()"
ctx, cancel := drivers.GetContext(config.StatementTimeoutInSecs)
defer cancel()
var databaseName string
if err := conn.QueryRowContext(ctx, query).Scan(&databaseName); err != nil {
return "", &drivers.DatabaseError{
OrigErr: err,
Driver: driverName,
Message: "failed to fetch database name",
Command: "current_database",
Query: []byte(query),
}
}
return databaseName, nil
}
func mergeConfigWithParams(params map[string]string, config *driverConfig) (*driverConfig, error) {
var err error
for _, configKey := range configParams {
if v, ok := params[configKey]; ok {
switch configKey {
case "x-migration-max-size":
if config.MigrationMaxSize, err = strconv.Atoi(v); err != nil {
return nil, errors.New(fmt.Sprintf("failed to cast config param %s of %s", configKey, v))
}
case "x-migrations-table":
config.MigrationsTable = v
case "x-statement-timeout":
if config.StatementTimeoutInSecs, err = strconv.Atoi(v); err != nil {
return nil, errors.New(fmt.Sprintf("failed to cast config param %s of %s", configKey, v))
}
}
}
}
return config, nil
}
func (driver *mysql) addMigrationQuery(migration *models.Migration) string {
if migration.Direction == models.Down {
return fmt.Sprintf("DELETE FROM %s WHERE (Version=%d AND NAME='%s')", driver.config.MigrationsTable, migration.Version, migration.Name)
}
return fmt.Sprintf("INSERT INTO %s (Version, Name) VALUES (%d, '%s')", driver.config.MigrationsTable, migration.Version, migration.Name)
}
func (driver *mysql) SetConfig(key string, value interface{}) error {
if driver.config != nil {
switch key {
case "StatementTimeoutInSecs":
n, ok := value.(int)
if ok {
driver.config.StatementTimeoutInSecs = n
return nil
}
return fmt.Errorf("incorrect value type for %s", key)
case "MigrationsTable":
n, ok := value.(string)
if ok {
driver.config.MigrationsTable = n
return nil
}
return fmt.Errorf("incorrect value type for %s", key)
}
}
return fmt.Errorf("incorrect key name %q", key)
}