mirror of https://github.com/pressly/goose.git
112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"log"
|
|
"os"
|
|
"os/exec"
|
|
"path/filepath"
|
|
"text/template"
|
|
)
|
|
|
|
type TemplateData struct {
|
|
Version int64
|
|
DBDriver string
|
|
DBOpen string
|
|
Direction bool
|
|
Func string
|
|
}
|
|
|
|
//
|
|
// Run a .go migration.
|
|
//
|
|
// In order to do this, we copy a modified version of the
|
|
// original .go migration, and execute it via `go run` along
|
|
// with a main() of our own creation.
|
|
//
|
|
func runGoMigration(conf *DBConf, path string, version int64, direction bool) error {
|
|
|
|
// everything gets written to a temp dir, and zapped afterwards
|
|
d, e := ioutil.TempDir("", "goose")
|
|
if e != nil {
|
|
log.Fatal(e)
|
|
}
|
|
defer os.RemoveAll(d)
|
|
|
|
directionStr := "Down"
|
|
if direction {
|
|
directionStr = "Up"
|
|
}
|
|
|
|
td := &TemplateData{
|
|
Version: version,
|
|
DBDriver: conf.Driver,
|
|
DBOpen: conf.OpenStr,
|
|
Direction: direction,
|
|
Func: fmt.Sprintf("%v_%v", directionStr, version),
|
|
}
|
|
main, e := writeTemplateToFile(filepath.Join(d, "goose_main.go"), goMigrationTmpl, td)
|
|
if e != nil {
|
|
log.Fatal(e)
|
|
}
|
|
|
|
outpath := filepath.Join(d, filepath.Base(path))
|
|
if _, e = copyFile(outpath, path); e != nil {
|
|
log.Fatal(e)
|
|
}
|
|
|
|
cmd := exec.Command("go", "run", main, outpath)
|
|
cmd.Stdout = os.Stdout
|
|
cmd.Stderr = os.Stderr
|
|
if e = cmd.Run(); e != nil {
|
|
log.Fatal("`go run` failed: ", e)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
//
|
|
// template for the main entry point to a go-based migration.
|
|
// this gets linked against the substituted versions of the user-supplied
|
|
// scripts in order to execute a migration via `go run`
|
|
//
|
|
var goMigrationTmpl = template.Must(template.New("driver").Parse(`
|
|
package main
|
|
|
|
import (
|
|
"database/sql"
|
|
_ "github.com/lib/pq"
|
|
"log"
|
|
"fmt"
|
|
)
|
|
|
|
func main() {
|
|
db, err := sql.Open("{{.DBDriver}}", "{{.DBOpen}}")
|
|
if err != nil {
|
|
log.Fatal("failed to open DB:", err)
|
|
}
|
|
defer db.Close()
|
|
|
|
txn, err := db.Begin()
|
|
if err != nil {
|
|
log.Fatal("db.Begin:", err)
|
|
}
|
|
|
|
{{ .Func }}(txn)
|
|
|
|
// XXX: drop goose_db_version table on some minimum version number?
|
|
versionFmt := "INSERT INTO goose_db_version (version_id, is_applied) VALUES (%v, %t);"
|
|
versionStmt := fmt.Sprintf(versionFmt, int64({{ .Version }}), {{ .Direction }})
|
|
if _, err = txn.Exec(versionStmt); err != nil {
|
|
txn.Rollback()
|
|
log.Fatal("failed to write version: ", err)
|
|
}
|
|
|
|
err = txn.Commit()
|
|
if err != nil {
|
|
log.Fatal("Commit() failed:", err)
|
|
}
|
|
}
|
|
`))
|