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migrate.go
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migrate.go
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package cmd
import (
"fmt"
"path/filepath"
"github.com/mattes/migrate"
_ "github.com/mattes/migrate/database/postgres"
_ "github.com/mattes/migrate/source/file"
"gopkg.in/src-d/go-kallax.v1/generator"
cli "gopkg.in/urfave/cli.v1"
)
var Migrate = cli.Command{
Name: "migrate",
Usage: "Generate migrations for current kallax models",
Action: migrateAction,
Flags: []cli.Flag{
cli.StringFlag{
Name: "out, o",
Usage: "Output directory of migrations",
},
cli.StringFlag{
Name: "name, n",
Usage: "Descriptive name for the migration",
Value: "migration",
},
cli.StringSliceFlag{
Name: "input, i",
Usage: "List of directories to scan models from. You can use this flag as many times as you want.",
},
},
Subcommands: cli.Commands{
Up,
Down,
},
}
var migrationFlags = []cli.Flag{
cli.StringFlag{
Name: "dir, d",
Value: "./migrations",
Usage: "Directory where your migrations are stored",
},
cli.StringFlag{
Name: "dsn",
Usage: "PostgreSQL data source name. Example: `user:pass@localhost:5432/database?sslmode=enable`",
},
cli.UintFlag{
Name: "steps, n",
Usage: "Number of migrations to run",
},
cli.UintFlag{
Name: "version, v",
Usage: "Migrate to a specific version. If `steps` and this flag are given, this will be used.",
},
}
var Up = cli.Command{
Name: "up",
Usage: "Executes the migrations from the current version until the specified version.",
Action: runMigrationAction(upAction),
Flags: append(migrationFlags, cli.BoolFlag{
Name: "all",
Usage: "If this flag is used, the database will be migrated all the way up.",
}),
}
var Down = cli.Command{
Name: "down",
Usage: "Downgrades the database a certain number of migrations or until a certain version.",
Action: runMigrationAction(downAction),
Flags: migrationFlags,
}
func upAction(m *migrate.Migrate, steps, version uint, all bool) error {
if all {
if err := m.Up(); err != nil {
return fmt.Errorf("kallax: unable to upgrade the database all the way up: %s", err)
}
} else if version > 0 {
if err := m.Migrate(version); err != nil {
return fmt.Errorf("kallax: unable to upgrade up to version %d: %s", version, err)
}
} else if steps > 0 {
if err := m.Steps(int(steps)); err != nil {
return fmt.Errorf("kallax: unable to execute %d migration(s) up: %s", steps, err)
}
} else {
return fmt.Errorf("WARN: No `version` or `steps` provided")
}
reportMigrationSuccess(m)
return nil
}
func downAction(m *migrate.Migrate, steps, version uint, all bool) error {
if version > 0 {
if err := m.Migrate(version); err != nil {
return fmt.Errorf("kallax: unable to rollback to version %d: %s", version, err)
}
} else if steps > 0 {
if err := m.Steps(-int(steps)); err != nil {
return fmt.Errorf("kallax: unable to execute %d migration(s) down: %s", steps, err)
}
} else {
return fmt.Errorf("kallax: no `version` or `steps` provided. You need to specify one of them.")
}
reportMigrationSuccess(m)
return nil
}
func reportMigrationSuccess(m *migrate.Migrate) {
fmt.Println("Success! the migration has been run.")
if v, _, err := m.Version(); err != nil {
fmt.Printf("Unable to check the latest version of the database: %s.\n", err)
} else {
fmt.Printf("Database is now at version %d.\n", v)
}
}
type runMigrationFunc func(m *migrate.Migrate, steps, version uint, all bool) error
func runMigrationAction(fn runMigrationFunc) cli.ActionFunc {
return func(c *cli.Context) error {
var (
dir = c.String("dir")
dsn = c.String("dsn")
steps = c.Uint("steps")
version = c.Uint("version")
all = c.Bool("all")
)
ok, err := isDirectory(dir)
if err != nil {
return fmt.Errorf("kallax: cannot check if `dir` is a directory: %s", err)
}
if !ok {
return fmt.Errorf("kallax: argument `dir` must be a valid directory")
}
dir, err = filepath.Abs(dir)
if err != nil {
return fmt.Errorf("kallax: cannot get absolute path of `dir`: %s", err)
}
m, err := migrate.New(pathToFileURL(dir), fmt.Sprintf("postgres://%s", dsn))
if err != nil {
return fmt.Errorf("kallax: unable to open a connection with the database: %s", err)
}
return fn(m, steps, version, all)
}
}
func pathToFileURL(path string) string {
if !filepath.IsAbs(path) {
var err error
path, err = filepath.Abs(path)
if err != nil {
return ""
}
}
return fmt.Sprintf("file://%s", filepath.ToSlash(path))
}
func migrateAction(c *cli.Context) error {
dirs := c.StringSlice("input")
dir := c.String("out")
name := c.String("name")
var pkgs []*generator.Package
for _, dir := range dirs {
ok, err := isDirectory(dir)
if err != nil {
return fmt.Errorf("kallax: cannot check directory in `input`: %s", err)
}
if !ok {
return fmt.Errorf("kallax: `input` must be a valid directory")
}
p := generator.NewProcessor(dir, nil)
p.Silent()
pkg, err := p.Do()
if err != nil {
return err
}
pkgs = append(pkgs, pkg)
}
ok, err := isDirectory(dir)
if err != nil {
return fmt.Errorf("kallax: cannot check directory in `out`: %s", err)
}
if !ok {
return fmt.Errorf("kallax: `out` must be a valid directory")
}
g := generator.NewMigrationGenerator(name, dir)
migration, err := g.Build(pkgs...)
if err != nil {
return err
}
return g.Generate(migration)
}