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