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tool.go
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// Copyright 2021-present The Atlas Authors. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package sqltool
import (
"bufio"
"bytes"
"errors"
"fmt"
"io/fs"
"path/filepath"
"regexp"
"sort"
"strings"
"text/template"
"time"
"unicode"
"github.com/iasthc/atlas/sql/migrate"
)
var (
// GolangMigrateFormatter returns migrate.Formatter compatible with golang-migrate/migrate.
GolangMigrateFormatter = templateFormatter(
"{{ now }}{{ with .Name }}_{{ . }}{{ end }}.up.sql",
`{{ range .Changes }}{{ with .Comment }}-- {{ println . }}{{ end }}{{ printf "%s;\n" .Cmd }}{{ end }}`,
"{{ now }}{{ with .Name }}_{{ . }}{{ end }}.down.sql",
`{{ range $c := rev .Changes }}{{ with $stmts := .ReverseStmts }}{{ with $c.Comment }}-- reverse: {{ println . }}{{ end }}{{ range $stmts }}{{ printf "%s;\n" . }}{{ end }}{{ end }}{{ end }}`,
)
// GooseFormatter returns migrate.Formatter compatible with pressly/goose.
GooseFormatter = templateFormatter(
"{{ now }}{{ with .Name }}_{{ . }}{{ end }}.sql",
`-- +goose Up
{{ range .Changes }}{{ with .Comment }}-- {{ println . }}{{ end }}{{ printf "%s;\n" .Cmd }}{{ end }}
-- +goose Down
{{ range $c := rev .Changes }}{{ with $stmts := .ReverseStmts }}{{ with $c.Comment }}-- reverse: {{ println . }}{{ end }}{{ range $stmts }}{{ printf "%s;\n" . }}{{ end }}{{ end }}{{ end }}`,
)
// FlywayFormatter returns migrate.Formatter compatible with Flyway.
FlywayFormatter = templateFormatter(
"V{{ now }}{{ with .Name }}__{{ . }}{{ end }}.sql",
`{{ range .Changes }}{{ with .Comment }}-- {{ println . }}{{ end }}{{ printf "%s;\n" .Cmd }}{{ end }}`,
"U{{ now }}{{ with .Name }}__{{ . }}{{ end }}.sql",
`{{ range $c := rev .Changes }}{{ with $stmts := .ReverseStmts }}{{ with $c.Comment }}-- reverse: {{ println . }}{{ end }}{{ range $stmts }}{{ printf "%s;\n" . }}{{ end }}{{ end }}{{ end }}`,
)
// LiquibaseFormatter returns migrate.Formatter compatible with Liquibase.
LiquibaseFormatter = templateFormatter(
"{{ now }}{{ with .Name }}_{{ . }}{{ end }}.sql",
`{{- $now := now -}}
--liquibase formatted sql
{{- range $index, $change := .Changes }}
--changeset atlas:{{ $now }}-{{ inc $index }}
{{ with $change.Comment }}--comment: {{ . }}{{ end }}
{{ $change.Cmd }};
{{ with $stmts := .ReverseStmts }}{{ range $stmts }}{{ printf "--rollback: %s;\n" . }}{{ end }}{{ end }}
{{- end }}`,
)
// DBMateFormatter returns migrate.Formatter compatible with amacneil/dbmate.
DBMateFormatter = templateFormatter(
"{{ now }}{{ with .Name }}_{{ . }}{{ end }}.sql",
`-- migrate:up
{{ range .Changes }}{{ with .Comment }}-- {{ println . }}{{ end }}{{ printf "%s;\n" .Cmd }}{{ end }}
-- migrate:down
{{ range $c := rev .Changes }}{{ with $stmts := .ReverseStmts }}{{ with $c.Comment }}-- reverse: {{ println . }}{{ end }}{{ range $stmts }}{{ printf "%s;\n" . }}{{ end }}{{ end }}{{ end }}`,
)
// DbmateFormatter is the same as DBMateFormatter.
// Deprecated: Use DBMateFormatter instead.
DbmateFormatter = DBMateFormatter
)
type (
// GolangMigrateDir wraps fs.FS and provides a migrate.Scanner implementation able to understand files
// generated by the GolangMigrateFormatter for migration directory replaying.
GolangMigrateDir struct{ fs.FS }
// GolangMigrateFile wraps migrate.LocalFile with custom description function.
GolangMigrateFile struct{ *migrate.LocalFile }
)
// NewGolangMigrateDir returns a new GolangMigrateDir.
func NewGolangMigrateDir(path string) (*GolangMigrateDir, error) {
dir, err := migrate.NewLocalDir(path)
if err != nil {
return nil, err
}
return &GolangMigrateDir{dir}, nil
}
// Path returns the local path used for opening this dir.
func (d *GolangMigrateDir) Path() string {
if dir, ok := d.FS.(dirPath); ok {
return dir.Path()
}
return ""
}
// Files implements Scanner.Files. It looks for all files with up.sql suffix and orders them by filename.
func (d *GolangMigrateDir) Files() ([]migrate.File, error) {
names, err := fs.Glob(d, "*.up.sql")
if err != nil {
return nil, err
}
// Sort files lexicographically.
sort.Slice(names, func(i, j int) bool {
return names[i] < names[j]
})
ret := make([]migrate.File, len(names))
for i, n := range names {
b, err := fs.ReadFile(d, n)
if err != nil {
return nil, fmt.Errorf("sql/migrate: read file %q: %w", n, err)
}
ret[i] = &GolangMigrateFile{LocalFile: migrate.NewLocalFile(n, b)}
}
return ret, nil
}
// Checksum implements Dir.Checksum. By default, it calls Files() and creates a checksum from them.
func (d *GolangMigrateDir) Checksum() (migrate.HashFile, error) {
if d, ok := d.FS.(migrate.Dir); ok {
return d.Checksum()
}
files, err := d.Files()
if err != nil {
return nil, err
}
return migrate.NewHashFile(files)
}
// WriteFile implements Dir.WriteFile.
func (d *GolangMigrateDir) WriteFile(name string, b []byte) error {
if d, ok := d.FS.(migrate.Dir); ok {
return d.WriteFile(name, b)
}
return errors.New("sql/sqltool: write not supported")
}
// Desc implements File.Desc.
func (f *GolangMigrateFile) Desc() string {
return strings.TrimSuffix(f.LocalFile.Desc(), ".up")
}
type (
// GooseDir wraps migrate.LocalDir and provides a migrate.Scanner implementation able to understand files
// generated by the GooseFormatter for migration directory replaying.
GooseDir struct{ *migrate.LocalDir }
// GooseFile wraps migrate.LocalFile with custom statements function.
GooseFile struct{ *migrate.LocalFile }
)
// NewGooseDir returns a new GooseDir.
func NewGooseDir(path string) (*GooseDir, error) {
dir, err := migrate.NewLocalDir(path)
if err != nil {
return nil, err
}
return &GooseDir{dir}, nil
}
// Files looks for all files with .sql suffix and orders them by filename.
func (d *GooseDir) Files() ([]migrate.File, error) {
files, err := d.LocalDir.Files()
if err != nil {
return nil, err
}
for i, f := range files {
files[i] = &GooseFile{f.(*migrate.LocalFile)}
}
return files, nil
}
// StmtDecls understands the migration format used by pressly/goose sql migration files.
func (f *GooseFile) StmtDecls() ([]*migrate.Stmt, error) {
// Atlas custom delimiter is per file, goose has pragma do mark start and end of a delimiter.
// In order to use the Atlas lexer, we define a custom delimiter for the source SQL and edit it to use the
// custom delimiter.
const delim = "-- ATLAS_DELIM_END"
var (
state, lineCount int
lines = []string{"-- atlas:delimiter " + delim, ""}
sc = bufio.NewScanner(bytes.NewReader(f.Bytes()))
)
Scan:
for sc.Scan() {
lineCount++
line := sc.Text()
// Handle goose custom delimiters.
if strings.HasPrefix(line, goosePragma) {
switch strings.TrimSpace(strings.TrimPrefix(line, goosePragma)) {
case "Up":
switch state {
case none: // found the "up" part of the file
state = up
default:
return nil, unexpectedPragmaErr(f, lineCount, "Up")
}
case "Down":
switch state {
case up: // found the "down" part
break Scan
default:
return nil, unexpectedPragmaErr(f, lineCount, "Down")
}
case "StatementBegin":
switch state {
case up:
state = begin // begin of a statement
default:
return nil, unexpectedPragmaErr(f, lineCount, "StatementBegin")
}
case "StatementEnd":
switch state {
case begin:
state = end // end of a statement
default:
return nil, unexpectedPragmaErr(f, lineCount, "StatementEnd")
}
}
}
// Write the line of the statement.
if !reGoosePragma.MatchString(line) && state != end {
// end of statement if line ends with semicolon
line = strings.TrimRightFunc(line, unicode.IsSpace)
lines = append(lines, line)
if state == up && strings.HasSuffix(line, ";") && !strings.HasPrefix(line, "--") {
lines = append(lines, delim)
}
}
if state == end {
state = up
lines = append(lines, delim)
}
}
return migrate.Stmts(strings.Join(lines, "\n"))
}
// Stmts understands the migration format used by pressly/goose sql migration files.
func (f *GooseFile) Stmts() ([]string, error) {
s, err := f.StmtDecls()
if err != nil {
return nil, err
}
stmts := make([]string, len(s))
for i := range s {
stmts[i] = s[i].Text
}
return stmts, nil
}
type (
// DBMateDir wraps migrate.LocalDir and provides a migrate.Scanner implementation able to understand files
// generated by the DBMateFormatter for migration directory replaying.
DBMateDir struct{ *migrate.LocalDir }
// DBMateFile wraps migrate.LocalFile with custom statements function.
DBMateFile struct{ *migrate.LocalFile }
)
// NewDBMateDir returns a new DBMateDir.
func NewDBMateDir(path string) (*DBMateDir, error) {
dir, err := migrate.NewLocalDir(path)
if err != nil {
return nil, err
}
return &DBMateDir{dir}, nil
}
// Files looks for all files with up.sql suffix and orders them by filename.
func (d *DBMateDir) Files() ([]migrate.File, error) {
files, err := d.LocalDir.Files()
if err != nil {
return nil, err
}
for i, f := range files {
files[i] = &DBMateFile{f.(*migrate.LocalFile)}
}
return files, nil
}
// StmtDecls understands the migration format used by amacneil/dbmate sql migration files.
func (f *DBMateFile) StmtDecls() ([]*migrate.Stmt, error) {
var (
state, lineCount int
lines []string
sc = bufio.NewScanner(bytes.NewReader(f.Bytes()))
)
Scan:
for sc.Scan() {
lineCount++
line := sc.Text()
// Handle pragmas.
if strings.HasPrefix(line, dbmatePragma) {
switch strings.TrimSpace(strings.TrimPrefix(line, dbmatePragma)) {
case "up":
state = up
case "down":
break Scan
}
}
// Write the line of the statement.
if !reDBMatePragma.MatchString(line) && state == up {
lines = append(lines, line)
}
}
return migrate.Stmts(strings.Join(lines, "\n"))
}
// Stmts understands the migration format used by amacneil/dbmate sql migration files.
func (f *DBMateFile) Stmts() ([]string, error) {
s, err := f.StmtDecls()
if err != nil {
return nil, err
}
stmts := make([]string, len(s))
for i := range s {
stmts[i] = s[i].Text
}
return stmts, nil
}
type (
// FlywayDir wraps fs.FS and provides a migrate.Scanner implementation able to understand files
// generated by the FlywayFormatter for migration directory replaying.
FlywayDir struct{ fs.FS }
// FlywayFile wraps migrate.LocalFile with custom statements function.
FlywayFile struct{ *migrate.LocalFile }
)
// NewFlywayDir returns a new FlywayDir.
func NewFlywayDir(path string) (*FlywayDir, error) {
dir, err := migrate.NewLocalDir(path)
if err != nil {
return nil, err
}
return &FlywayDir{dir}, nil
}
// Path returns the local path used for opening this dir.
func (d *FlywayDir) Path() string {
if dir, ok := d.FS.(dirPath); ok {
return dir.Path()
}
return ""
}
// Files implements Scanner.Files. It looks for all files with .sql suffix. The given directory is recursively scanned
// for non-hidden subdirectories. All found files will be ordered by migration type (Baseline, Versioned, Repeatable)
// and filename.
func (d *FlywayDir) Files() ([]migrate.File, error) {
var ff flywayFiles
if err := fs.WalkDir(d, ".", func(path string, e fs.DirEntry, err error) error {
if err != nil {
return err
}
if path != "." && e.IsDir() {
fullPath := path
if p, ok := d.FS.(dirPath); ok {
fullPath = filepath.Join(p.Path(), path)
}
h, err := hidden(fullPath)
if err != nil {
return err
}
if h {
return fs.SkipDir
}
return nil
}
var (
pfx = e.Name()[0]
base = filepath.Base(e.Name())
ext = filepath.Ext(e.Name())
)
if ext != ".sql" || len(base) < 4 || (pfx != 'V' && pfx != 'B' && pfx != 'R') {
return nil
}
return ff.add(path)
}); err != nil {
return nil, err
}
var (
names = ff.names()
ret = make([]migrate.File, len(names))
)
for i, n := range names {
b, err := fs.ReadFile(d, n)
if err != nil {
return nil, fmt.Errorf("sql/migrate: read file %q: %w", n, err)
}
ret[i] = &FlywayFile{migrate.NewLocalFile(n, b)}
}
return ret, nil
}
// Checksum implements Dir.Checksum. By default, it calls Files() and creates a checksum from them.
func (d *FlywayDir) Checksum() (migrate.HashFile, error) {
if d, ok := d.FS.(migrate.Dir); ok {
return d.Checksum()
}
files, err := d.Files()
if err != nil {
return nil, err
}
return migrate.NewHashFile(files)
}
// WriteFile implements Dir.WriteFile.
func (d *FlywayDir) WriteFile(name string, b []byte) error {
if d, ok := d.FS.(migrate.Dir); ok {
return d.WriteFile(name, b)
}
return errors.New("sql/sqltool: write not supported")
}
// Desc implements File.Desc.
func (f FlywayFile) Desc() string {
return flywayDesc(f.Name())
}
// Version implements File.Version.
func (f FlywayFile) Version() string {
return flywayVersion(f.Name())
}
// SetRepeatableVersion iterates over the migration files and assigns repeatable migrations a version number since
// Atlas does not have the concept of repeatable migrations. Each repeatable migration file gets assigned the version
// of the preceding migration file (or 0) followed by an 'R'.
func SetRepeatableVersion(ff []migrate.File) {
// First find the index of the first repeatable migration file (if any).
var (
v string // last versioned migration version
idx = func() int {
for i, f := range ff {
if f.Version() == "" {
return i
}
}
return -1
}()
)
switch idx {
case -1:
// No repeatable migration does exist.
return
case 0:
// There is no preceding migration. Use Version "0".
v = "0"
default:
v = ff[idx-1].Version()
}
if v != "" {
// Every migration file following the first repeatable found are repeatable as well.
for i, f := range ff[idx:] {
ff[idx+i] = &FlywayFile{migrate.NewLocalFile(
fmt.Sprintf("V%sR__%s", v, f.Desc()),
f.Bytes(),
)}
}
}
}
// LiquibaseDir wraps migrate.LocalDir and provides a migrate.Scanner implementation able to understand files
// generated by the LiquibaseFormatter for migration directory replaying.
type LiquibaseDir struct{ *migrate.LocalDir }
// NewLiquibaseDir returns a new LiquibaseDir.
func NewLiquibaseDir(path string) (*LiquibaseDir, error) {
d, err := migrate.NewLocalDir(path)
if err != nil {
return nil, err
}
return &LiquibaseDir{d}, nil
}
const (
none int = iota
up
begin
end
goosePragma = "-- +goose"
dbmatePragma = "-- migrate:"
)
var (
reGoosePragma = regexp.MustCompile(regexp.QuoteMeta(goosePragma) + " Up|Down|StatementBegin|StatementEnd")
reDBMatePragma = regexp.MustCompile(dbmatePragma + "up|down")
)
// flywayFiles retrieves flyway migration files by calls to add(). It will only keep the latest baseline and ignore
// all versioned files that are included in that baseline.
type flywayFiles struct {
baseline string
versioned []string
repeatable []string
}
// add the given path to the migration files according to its type. The input directory is assumed to be valid
// according to the Flyway documentation (no duplicate versions, etc.).
func (ff *flywayFiles) add(path string) error {
switch p := filepath.Base(path)[0]; p {
case 'B':
if ff.baseline != "" && flywayVersion(path) < flywayVersion(ff.baseline) {
return nil
}
ff.baseline = path
// In case we set a new baseline, remove all versioned files with a version smaller than the new baseline.
var (
bv = flywayVersion(ff.baseline)
vs []string
)
for _, v := range ff.versioned {
if v > bv {
vs = append(vs, v)
}
}
ff.versioned = vs
return nil
case 'V':
v := flywayVersion(path)
if ff.baseline == "" || flywayVersion(ff.baseline) < v {
ff.versioned = append(ff.versioned, path)
}
return nil
case 'R':
ff.repeatable = append(ff.repeatable, path)
return nil
default:
return fmt.Errorf("sql/sqltool: unexpected Flyway prefix %q", p)
}
}
func (ff *flywayFiles) names() []string {
var names []string
if ff.baseline != "" {
names = append(names, ff.baseline)
}
sort.Strings(ff.versioned)
sort.Strings(ff.repeatable)
names = append(names, ff.versioned...)
names = append(names, ff.repeatable...)
return names
}
func flywayDesc(path string) string {
parts := strings.SplitN(path, "__", 2)
if len(parts) == 1 {
return ""
}
return strings.TrimSuffix(parts[1], ".sql")
}
func flywayVersion(path string) string {
// Repeatable migrations don't have a version.
if filepath.Base(path)[0] == 'R' {
return ""
}
return strings.SplitN(strings.TrimSuffix(filepath.Base(path), ".sql"), "__", 2)[0][1:]
}
func unexpectedPragmaErr(f migrate.File, line int, pragma string) error {
var tool string
switch f := f.(type) {
case *GooseFile:
tool = "goose"
case *DBMateFile:
tool = "dbmate"
default:
return fmt.Errorf("sql/migrate: unexpected migration file type '%T'", f)
}
return fmt.Errorf(
"sql/migrate: %s: %s:%d unexpected goosePragma '%s'",
tool, f.Name(), line, pragma,
)
}
// funcs contains the template.FuncMap for the different formatters.
var funcs = template.FuncMap{
"inc": func(x int) int { return x + 1 },
// now formats the current time in a lexicographically ascending order while maintaining human readability.
"now": func() string { return time.Now().UTC().Format("20060102150405") },
"rev": reverse,
}
// templateFormatter parses the given templates and passes them on to the migrate.NewTemplateFormatter.
func templateFormatter(templates ...string) migrate.Formatter {
tpls := make([]*template.Template, len(templates))
for i, t := range templates {
tpls[i] = template.Must(template.New("").Funcs(funcs).Parse(t))
}
tf, err := migrate.NewTemplateFormatter(tpls...)
if err != nil {
panic(err)
}
return tf
}
// reverse changes for the down migration.
func reverse(changes []*migrate.Change) []*migrate.Change {
n := len(changes)
rev := make([]*migrate.Change, n)
if n%2 == 1 {
rev[n/2] = changes[n/2]
}
for i, j := 0, n-1; i < j; i, j = i+1, j-1 {
rev[i], rev[j] = changes[j], changes[i]
}
return rev
}
type dirPath interface {
Path() string
}
var (
_ dirPath = (*DBMateDir)(nil)
_ dirPath = (*FlywayDir)(nil)
_ dirPath = (*GolangMigrateDir)(nil)
_ dirPath = (*GooseDir)(nil)
_ dirPath = (*LiquibaseDir)(nil)
)