130 lines
2.7 KiB
Go
130 lines
2.7 KiB
Go
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package goose
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import (
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"bytes"
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"encoding/gob"
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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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Import string
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Conf string // gob encoded DBConf
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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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var bb bytes.Buffer
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if err := gob.NewEncoder(&bb).Encode(conf); err != nil {
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return err
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}
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// XXX: there must be a better way of making this byte array
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// available to the generated code...
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// but for now, print an array literal of the gob bytes
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var sb bytes.Buffer
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sb.WriteString("[]byte{ ")
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for _, b := range bb.Bytes() {
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sb.WriteString(fmt.Sprintf("0x%02x, ", b))
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}
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sb.WriteString("}")
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td := &templateData{
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Version: version,
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Import: conf.Driver.Import,
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Conf: sb.String(),
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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"), goMigrationDriverTemplate, 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 goMigrationDriverTemplate = template.Must(template.New("goose.go-driver").Parse(`
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package main
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import (
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"log"
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"bytes"
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"encoding/gob"
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_ "{{.Import}}"
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"github.com/Altoros/gorm-goose/lib/goose"
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)
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func main() {
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var conf goose.DBConf
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buf := bytes.NewBuffer({{ .Conf }})
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if err := gob.NewDecoder(buf).Decode(&conf); err != nil {
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log.Fatal("gob.Decode - ", err)
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}
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db, err := goose.OpenDBFromDBConf(&conf)
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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 := db.Begin()
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if txn.Error != nil {
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log.Fatal("db.Begin:", txn.Error)
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}
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{{ .Func }}(txn)
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err = goose.FinalizeMigration(&conf, txn, {{ .Direction }}, {{ .Version }})
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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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