118 lines
3 KiB
Go
118 lines
3 KiB
Go
package mysql
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import (
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"database/sql"
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"errors"
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"fmt"
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"strings"
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"github.com/go-jet/jet/v2/generator/metadata"
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"github.com/go-jet/jet/v2/generator/template"
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"github.com/go-jet/jet/v2/mysql"
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mysqldr "github.com/go-sql-driver/mysql"
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)
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const mysqlMaxConns = 10
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// DBConnection contains MySQL connection details
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type DBConnection struct {
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Host string
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Port int
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User string
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Password string
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Params string
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DBName string
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}
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// Generate generates jet files at destination dir from database connection details
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func Generate(destDir string, dbConn DBConnection, generatorTemplate ...template.Template) error {
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connectionString := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", dbConn.User, dbConn.Password, dbConn.Host, dbConn.Port, dbConn.DBName)
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if dbConn.Params != "" {
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connectionString += "?" + dbConn.Params
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}
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db, err := openConnection(connectionString)
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if err != nil {
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return fmt.Errorf("failed to open db connection: %w", err)
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}
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defer db.Close()
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err = generate(db, dbConn.DBName, destDir, generatorTemplate...)
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if err != nil {
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return err
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}
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return nil
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}
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// GenerateDSN opens connection via DSN string and does everything what Generate does.
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func GenerateDSN(dsn, destDir string, templates ...template.Template) error {
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// Special case for go mysql driver. It does not understand schema,
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// so we need to trim it before passing to generator
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// https://github.com/go-sql-driver/mysql#dsn-data-source-name
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idx := strings.Index(dsn, "://")
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if idx != -1 {
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dsn = dsn[idx+len("://"):]
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}
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cfg, err := mysqldr.ParseDSN(dsn)
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if err != nil {
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return fmt.Errorf("failed to parse DSN: %w", err)
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}
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if cfg.DBName == "" {
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return errors.New("database name is required")
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}
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db, err := openConnection(dsn)
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if err != nil {
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return fmt.Errorf("failed to open db connection: %w", err)
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}
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defer db.Close()
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err = generate(db, cfg.DBName, destDir, templates...)
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if err != nil {
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return fmt.Errorf("failed to generate: %w", err)
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}
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return nil
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}
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func openConnection(connectionString string) (*sql.DB, error) {
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fmt.Println("Connecting to MySQL database...")
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db, err := sql.Open("mysql", connectionString)
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if err != nil {
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return nil, fmt.Errorf("failed to open mysql connection: %w", err)
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}
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db.SetMaxOpenConns(mysqlMaxConns)
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db.SetMaxIdleConns(mysqlMaxConns)
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err = db.Ping()
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if err != nil {
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return nil, fmt.Errorf("failed to ping database: %w", err)
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}
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return db, nil
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}
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func generate(db *sql.DB, dbName, destDir string, templates ...template.Template) error {
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fmt.Println("Retrieving database information...")
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// No schemas in MySQL
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schemaMetaData, err := metadata.GetSchema(db, &mySqlQuerySet{}, dbName)
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if err != nil {
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return fmt.Errorf("failed to get '%s' database metadata: %w", dbName, err)
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}
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genTemplate := template.Default(mysql.Dialect)
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if len(templates) > 0 {
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genTemplate = templates[0]
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}
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err = template.ProcessSchema(destDir, schemaMetaData, genTemplate)
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if err != nil {
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return fmt.Errorf("failed to process '%s' database: %w", schemaMetaData.Name, err)
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}
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return nil
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}
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