basic workflow

g_migration.go

@@ -64,8 +64,7 @@ func formatSourceCode(fpath string) {
 	cmd.Run()
 }
 
-const MIGRATION_TPL = `
-package main
+const MIGRATION_TPL = `package main
 
 import (
 	"time"

migrate.go

@@ -14,7 +14,13 @@
 
 package main
 
-import "os"
+import (
+	"database/sql"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+)
 
 var cmdMigrate = &Command{
 	UsageLine: "migrate [Command]",
@@ -34,6 +40,10 @@ bee migrate refresh
 `,
 }
 
+const (
+	TMP_DIR = "temp"
+)
+
 func init() {
 	cmdMigrate.Run = runMigration
 }
@@ -51,40 +61,180 @@ func runMigration(cmd *Command, args []string) {
 
 	if len(args) == 0 {
 		// run all outstanding migrations
-		ColorLog("[INFO] running all outstanding migrations\n")
+		ColorLog("[INFO] Running all outstanding migrations\n")
 		migrateUpdate()
 	} else {
 		mcmd := args[0]
 		switch mcmd {
 		case "rollback":
-			ColorLog("[INFO] rolling back the last migration operation\n")
+			ColorLog("[INFO] Rolling back the last migration operation\n")
 			migrateRollback()
 		case "reset":
-			ColorLog("[INFO] reseting all migrations\n")
+			ColorLog("[INFO] Reseting all migrations\n")
 			migrateReset()
 		case "refresh":
-			ColorLog("[INFO] refreshing all migrations\n")
+			ColorLog("[INFO] Refreshing all migrations\n")
 			migrateReset()
 		default:
-			ColorLog("[ERRO] command is missing\n")
+			ColorLog("[ERRO] Command is missing\n")
 			os.Exit(2)
 		}
-		ColorLog("[SUCC] migration successful!\n")
+		ColorLog("[SUCC] Migration successful!\n")
+	}
+}
+
+func checkForSchemaUpdateTable(driver string, connStr string) {
+	db, err := sql.Open(driver, connStr)
+	if err != nil {
+		ColorLog("[ERRO] Could not connect to %s: %s\n", driver, connStr)
+		os.Exit(2)
+	}
+	defer db.Close()
+	if rows, err := db.Query("SHOW TABLES LIKE 'migrations'"); err != nil {
+		ColorLog("[ERRO] Could not show migrations table: %s\n", err)
+		os.Exit(2)
+	} else if !rows.Next() {
+		// no migrations table, create anew
+		ColorLog("[INFO] Creating 'migrations' table...\n")
+		if _, err := db.Query(MYSQL_MIGRATION_DDL); err != nil {
+			ColorLog("[ERRO] Could not create migrations table: %s\n", err)
+			os.Exit(2)
+		}
+	}
+	// checking that migrations table schema are expected
+	if rows, err := db.Query("DESC migrations"); err != nil {
+		ColorLog("[ERRO] Could not show columns of migrations table: %s\n", err)
+		os.Exit(2)
+	} else {
+		for rows.Next() {
+			var fieldBytes, typeBytes, nullBytes, keyBytes, defaultBytes, extraBytes []byte
+			if err := rows.Scan(&fieldBytes, &typeBytes, &nullBytes, &keyBytes, &defaultBytes, &extraBytes); err != nil {
+				ColorLog("[ERRO] Could not read column information: %s\n", err)
+				os.Exit(2)
+			}
+			fieldStr, typeStr, nullStr, keyStr, defaultStr, extraStr :=
+				string(fieldBytes), string(typeBytes), string(nullBytes), string(keyBytes), string(defaultBytes), string(extraBytes)
+			if fieldStr == "id_migration" {
+				if keyStr != "PRI" || extraStr != "auto_increment" {
+					ColorLog("[ERRO] Column migration.id_migration type mismatch: KEY: %s, EXTRA: %s\n", keyStr, extraStr)
+					ColorLog("[HINT] Expecting KEY: PRI, EXTRA: auto_increment\n")
+					os.Exit(2)
+				}
+			} else if fieldStr == "file" {
+				if !strings.HasPrefix(typeStr, "varchar") || nullStr != "YES" {
+					ColorLog("[ERRO] Column migration.file type mismatch: TYPE: %s, NULL: %s\n", typeStr, nullStr)
+					ColorLog("[HINT] Expecting TYPE: varchar, NULL: YES\n")
+					os.Exit(2)
+				}
+
+			} else if fieldStr == "created_at" {
+				if typeStr != "timestamp" || defaultStr != "CURRENT_TIMESTAMP" {
+					ColorLog("[ERRO] Column migration.file type mismatch: TYPE: %s, DEFAULT: %s\n", typeStr, defaultStr)
+					ColorLog("[HINT] Expecting TYPE: timestamp, DEFAULT: CURRENT_TIMESTAMP\n")
+					os.Exit(2)
+				}
+			}
+		}
+	}
+}
+
+func createTempMigrationDir(path string) {
+	if err := os.MkdirAll(path, 0777); err != nil {
+		ColorLog("[ERRO] Could not create path: %s\n", err)
+		os.Exit(2)
+	}
+}
+
+func writeMigrationSourceFile(filename string, driver string, connStr string) {
+	if f, err := os.OpenFile(filename+".go", os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666); err != nil {
+		ColorLog("[ERRO] Could not create file: %s\n", err)
+		os.Exit(2)
+	} else {
+		content := strings.Replace(MIGRATION_MAIN_TPL, "{{DBDriver}}", driver, -1)
+		content = strings.Replace(content, "{{ConnStr}}", connStr, -1)
+		content = strings.Replace(content, "{{CurrTime}}", "123", -1)
+		if _, err := f.WriteString(content); err != nil {
+			ColorLog("[ERRO] Could not write to file: %s\n", err)
+			os.Exit(2)
+		}
+		f.Close()
+	}
+}
+
+func buildMigrationBinary(filename string) {
+	cmd := exec.Command("go", "build", "-o", filename, filename+".go")
+	if err := cmd.Run(); err != nil {
+		ColorLog("[ERRO] Could not build migration binary: %s\n", err)
+		os.Exit(2)
+	}
+}
+
+func runMigrationBinary(filename string) {
+	cmd := exec.Command("./" + filename)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		ColorLog("[ERRO] Could not run migration binary\n")
+		os.Exit(2)
+	} else {
+		ColorLog("[INFO] %s", string(out))
+	}
+}
+
+func cleanUpMigrationFiles(tmpPath string) {
+	if err := os.RemoveAll(tmpPath); err != nil {
+		ColorLog("[ERRO] Could not remove temporary migration directory: %s\n", err)
+		os.Exit(2)
 	}
 }
 
 func migrateUpdate() {
-	println("=>update")
+	connStr := "root:@tcp(127.0.0.1:3306)/sgfas?charset=utf8"
+	checkForSchemaUpdateTable("mysql", connStr)
+	filename := path.Join(TMP_DIR, "super")
+	createTempMigrationDir(TMP_DIR)
+	writeMigrationSourceFile(filename, "mysql", connStr)
+	buildMigrationBinary(filename)
+	runMigrationBinary(filename)
+	cleanUpMigrationFiles(TMP_DIR)
 }
 
 func migrateRollback() {
-	println("=>rollback")
 }
 
 func migrateReset() {
-	println("=>reset")
 }
 
 func migrateRefresh() {
-	println("=>refresh")
+	migrateReset()
+	migrateUpdate()
 }
+
+const (
+	MIGRATION_MAIN_TPL = `package main
+
+import(
+	"github.com/astaxie/beego/orm"
+	"github.com/astaxie/beego/migration"
+)
+
+func init(){
+	orm.RegisterDb("default", "{{DBDriver}}","{{ConnStr}}")
+}
+
+func main(){
+	migration.Upgrade({{CurrTime}})
+	//migration.Rollback()
+	//migration.Reset()
+	//migration.Refresh()
+}
+
+`
+	MYSQL_MIGRATION_DDL = `
+CREATE TABLE migrations (
+	id_migration int(10) unsigned NOT NULL AUTO_INCREMENT,
+	file varchar(255) DEFAULT NULL,
+	created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	statements text,
+	PRIMARY KEY (id_migration)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 
+`
+)