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Merge pull request #5 from openark/parse-alter-statement

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Support a complete ALTER TABLE statement in --alter
This commit is contained in:
Shlomi Noach 2020-07-29 15:34:00 +03:00 committed by GitHub
commit 9ccde4f4cd
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 220 additions and 42 deletions
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1
go/base/context.go
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@ -80,6 +80,7 @@ type MigrationContext struct {
DatabaseName string
OriginalTableName string
AlterStatement string
AlterStatementOptions string // anything following the 'ALTER TABLE [schema.]table' from AlterStatement
CountTableRows bool
ConcurrentCountTableRows bool

20
go/cmd/gh-ost/main.go
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@ -14,6 +14,7 @@ import (
"github.com/github/gh-ost/go/base"
"github.com/github/gh-ost/go/logic"
"github.com/github/gh-ost/go/sql"
_ "github.com/go-sql-driver/mysql"
"github.com/outbrain/golib/log"
@ -172,14 +173,25 @@ func main() {
migrationContext.Log.SetLevel(log.ERROR)
}
if migrationContext.AlterStatement == "" {
log.Fatalf("--alter must be provided and statement must not be empty")
}
parser := sql.NewParserFromAlterStatement(migrationContext.AlterStatement)
migrationContext.AlterStatementOptions = parser.GetAlterStatementOptions()
if migrationContext.DatabaseName == "" {
migrationContext.Log.Fatalf("--database must be provided and database name must not be empty")
if parser.HasExplicitSchema() {
migrationContext.DatabaseName = parser.GetExplicitSchema()
} else {
log.Fatalf("--database must be provided and database name must not be empty, or --alter must specify database name")
}
}
if migrationContext.OriginalTableName == "" {
migrationContext.Log.Fatalf("--table must be provided and table name must not be empty")
if parser.HasExplicitTable() {
migrationContext.OriginalTableName = parser.GetExplicitTable()
} else {
log.Fatalf("--table must be provided and table name must not be empty, or --alter must specify table name")
}
if migrationContext.AlterStatement == "" {
migrationContext.Log.Fatalf("--alter must be provided and statement must not be empty")
}
migrationContext.Noop = !(*executeFlag)
if migrationContext.AllowedRunningOnMaster && migrationContext.TestOnReplica {

2
go/logic/applier.go
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@ -190,7 +190,7 @@ func (this *Applier) AlterGhost() error {
query := fmt.Sprintf(`alter /* gh-ost */ table %s.%s %s`,
sql.EscapeName(this.migrationContext.DatabaseName),
sql.EscapeName(this.migrationContext.GetGhostTableName()),
this.migrationContext.AlterStatement,
this.migrationContext.AlterStatementOptions,
)
this.migrationContext.Log.Infof("Altering ghost table %s.%s",
sql.EscapeName(this.migrationContext.DatabaseName),

4
go/logic/migrator.go
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@ -60,7 +60,7 @@ const (
// Migrator is the main schema migration flow manager.
type Migrator struct {
parser *sql.Parser
parser *sql.AlterTableParser
inspector *Inspector
applier *Applier
eventsStreamer *EventsStreamer
@ -88,7 +88,7 @@ type Migrator struct {
func NewMigrator(context *base.MigrationContext) *Migrator {
migrator := &Migrator{
migrationContext: context,
parser: sql.NewParser(),
parser: sql.NewAlterTableParser(),
ghostTableMigrated: make(chan bool),
firstThrottlingCollected: make(chan bool, 3),
rowCopyComplete: make(chan error),

89
go/sql/parser.go
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@ -16,22 +16,50 @@ var (
renameColumnRegexp = regexp.MustCompile(`(?i)\bchange\s+(column\s+|)([\S]+)\s+([\S]+)\s+`)
dropColumnRegexp = regexp.MustCompile(`(?i)\bdrop\s+(column\s+|)([\S]+)$`)
renameTableRegexp = regexp.MustCompile(`(?i)\brename\s+(to|as)\s+`)
alterTableExplicitSchemaTableRegexps = []*regexp.Regexp{
// ALTER TABLE `scm`.`tbl` something
regexp.MustCompile(`(?i)\balter\s+table\s+` + "`" + `([^` + "`" + `]+)` + "`" + `[.]` + "`" + `([^` + "`" + `]+)` + "`" + `\s+(.*$)`),
// ALTER TABLE `scm`.tbl something
regexp.MustCompile(`(?i)\balter\s+table\s+` + "`" + `([^` + "`" + `]+)` + "`" + `[.]([\S]+)\s+(.*$)`),
// ALTER TABLE scm.`tbl` something
regexp.MustCompile(`(?i)\balter\s+table\s+([\S]+)[.]` + "`" + `([^` + "`" + `]+)` + "`" + `\s+(.*$)`),
// ALTER TABLE scm.tbl something
regexp.MustCompile(`(?i)\balter\s+table\s+([\S]+)[.]([\S]+)\s+(.*$)`),
}
alterTableExplicitTableRegexps = []*regexp.Regexp{
// ALTER TABLE `tbl` something
regexp.MustCompile(`(?i)\balter\s+table\s+` + "`" + `([^` + "`" + `]+)` + "`" + `\s+(.*$)`),
// ALTER TABLE tbl something
regexp.MustCompile(`(?i)\balter\s+table\s+([\S]+)\s+(.*$)`),
}
)
type Parser struct {
type AlterTableParser struct {
columnRenameMap map[string]string
droppedColumns map[string]bool
isRenameTable bool
alterStatementOptions string
alterTokens []string
explicitSchema string
explicitTable string
}
func NewParser() *Parser {
return &Parser{
func NewAlterTableParser() *AlterTableParser {
return &AlterTableParser{
columnRenameMap: make(map[string]string),
droppedColumns: make(map[string]bool),
}
}
func (this *Parser) tokenizeAlterStatement(alterStatement string) (tokens []string, err error) {
func NewParserFromAlterStatement(alterStatement string) *AlterTableParser {
parser := NewAlterTableParser()
parser.ParseAlterStatement(alterStatement)
return parser
}
func (this *AlterTableParser) tokenizeAlterStatement(alterStatement string) (tokens []string, err error) {
terminatingQuote := rune(0)
f := func(c rune) bool {
switch {
@ -58,13 +86,13 @@ func (this *Parser) tokenizeAlterStatement(alterStatement string) (tokens []stri
return tokens, nil
}
func (this *Parser) sanitizeQuotesFromAlterStatement(alterStatement string) (strippedStatement string) {
func (this *AlterTableParser) sanitizeQuotesFromAlterStatement(alterStatement string) (strippedStatement string) {
strippedStatement = alterStatement
strippedStatement = sanitizeQuotesRegexp.ReplaceAllString(strippedStatement, "''")
return strippedStatement
}
func (this *Parser) parseAlterToken(alterToken string) (err error) {
func (this *AlterTableParser) parseAlterToken(alterToken string) (err error) {
{
// rename
allStringSubmatch := renameColumnRegexp.FindAllStringSubmatch(alterToken, -1)
@ -97,16 +125,34 @@ func (this *Parser) parseAlterToken(alterToken string) (err error) {
return nil
}
func (this *Parser) ParseAlterStatement(alterStatement string) (err error) {
alterTokens, _ := this.tokenizeAlterStatement(alterStatement)
func (this *AlterTableParser) ParseAlterStatement(alterStatement string) (err error) {
this.alterStatementOptions = alterStatement
for _, alterTableRegexp := range alterTableExplicitSchemaTableRegexps {
if submatch := alterTableRegexp.FindStringSubmatch(this.alterStatementOptions); len(submatch) > 0 {
this.explicitSchema = submatch[1]
this.explicitTable = submatch[2]
this.alterStatementOptions = submatch[3]
break
}
}
for _, alterTableRegexp := range alterTableExplicitTableRegexps {
if submatch := alterTableRegexp.FindStringSubmatch(this.alterStatementOptions); len(submatch) > 0 {
this.explicitTable = submatch[1]
this.alterStatementOptions = submatch[2]
break
}
}
alterTokens, _ := this.tokenizeAlterStatement(this.alterStatementOptions)
for _, alterToken := range alterTokens {
alterToken = this.sanitizeQuotesFromAlterStatement(alterToken)
this.parseAlterToken(alterToken)
this.alterTokens = append(this.alterTokens, alterToken)
}
return nil
}
func (this *Parser) GetNonTrivialRenames() map[string]string {
func (this *AlterTableParser) GetNonTrivialRenames() map[string]string {
result := make(map[string]string)
for column, renamed := range this.columnRenameMap {
if column != renamed {
@ -116,14 +162,33 @@ func (this *Parser) GetNonTrivialRenames() map[string]string {
return result
}
func (this *Parser) HasNonTrivialRenames() bool {
func (this *AlterTableParser) HasNonTrivialRenames() bool {
return len(this.GetNonTrivialRenames()) > 0
}
func (this *Parser) DroppedColumnsMap() map[string]bool {
func (this *AlterTableParser) DroppedColumnsMap() map[string]bool {
return this.droppedColumns
}
func (this *Parser) IsRenameTable() bool {
func (this *AlterTableParser) IsRenameTable() bool {
return this.isRenameTable
}
func (this *AlterTableParser) GetExplicitSchema() string {
return this.explicitSchema
}
func (this *AlterTableParser) HasExplicitSchema() bool {
return this.GetExplicitSchema() != ""
}
func (this *AlterTableParser) GetExplicitTable() string {
return this.explicitTable
}
func (this *AlterTableParser) HasExplicitTable() bool {
return this.GetExplicitTable() != ""
}
func (this *AlterTableParser) GetAlterStatementOptions() string {
return this.alterStatementOptions
}

130
go/sql/parser_test.go
View File

@ -19,17 +19,19 @@ func init() {
func TestParseAlterStatement(t *testing.T) {
statement := "add column t int, engine=innodb"
parser := NewParser()
parser := NewAlterTableParser()
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
test.S(t).ExpectFalse(parser.HasNonTrivialRenames())
}
func TestParseAlterStatementTrivialRename(t *testing.T) {
statement := "add column t int, change ts ts timestamp, engine=innodb"
parser := NewParser()
parser := NewAlterTableParser()
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
test.S(t).ExpectFalse(parser.HasNonTrivialRenames())
test.S(t).ExpectEquals(len(parser.columnRenameMap), 1)
test.S(t).ExpectEquals(parser.columnRenameMap["ts"], "ts")
@ -37,9 +39,10 @@ func TestParseAlterStatementTrivialRename(t *testing.T) {
func TestParseAlterStatementTrivialRenames(t *testing.T) {
statement := "add column t int, change ts ts timestamp, CHANGE f `f` float, engine=innodb"
parser := NewParser()
parser := NewAlterTableParser()
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
test.S(t).ExpectFalse(parser.HasNonTrivialRenames())
test.S(t).ExpectEquals(len(parser.columnRenameMap), 2)
test.S(t).ExpectEquals(parser.columnRenameMap["ts"], "ts")
@ -58,9 +61,10 @@ func TestParseAlterStatementNonTrivial(t *testing.T) {
}
for _, statement := range statements {
parser := NewParser()
parser := NewAlterTableParser()
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
renames := parser.GetNonTrivialRenames()
test.S(t).ExpectEquals(len(renames), 2)
test.S(t).ExpectEquals(renames["i"], "count")
@ -69,7 +73,7 @@ func TestParseAlterStatementNonTrivial(t *testing.T) {
}
func TestTokenizeAlterStatement(t *testing.T) {
parser := NewParser()
parser := NewAlterTableParser()
{
alterStatement := "add column t int"
tokens, _ := parser.tokenizeAlterStatement(alterStatement)
@ -108,7 +112,7 @@ func TestTokenizeAlterStatement(t *testing.T) {
}
func TestSanitizeQuotesFromAlterStatement(t *testing.T) {
parser := NewParser()
parser := NewAlterTableParser()
{
alterStatement := "add column e enum('a','b','c')"
strippedStatement := parser.sanitizeQuotesFromAlterStatement(alterStatement)
@ -124,7 +128,7 @@ func TestSanitizeQuotesFromAlterStatement(t *testing.T) {
func TestParseAlterStatementDroppedColumns(t *testing.T) {
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
@ -132,16 +136,17 @@ func TestParseAlterStatementDroppedColumns(t *testing.T) {
test.S(t).ExpectTrue(parser.droppedColumns["b"])
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b, drop key c_idx, drop column `d`"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
test.S(t).ExpectEquals(len(parser.droppedColumns), 2)
test.S(t).ExpectTrue(parser.droppedColumns["b"])
test.S(t).ExpectTrue(parser.droppedColumns["d"])
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b, drop key c_idx, drop column `d`, drop `e`, drop primary key, drop foreign key fk_1"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
@ -151,7 +156,7 @@ func TestParseAlterStatementDroppedColumns(t *testing.T) {
test.S(t).ExpectTrue(parser.droppedColumns["e"])
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b, drop bad statement, add column i int"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
@ -163,38 +168,133 @@ func TestParseAlterStatementDroppedColumns(t *testing.T) {
func TestParseAlterStatementRenameTable(t *testing.T) {
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectFalse(parser.isRenameTable)
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "rename as something_else"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectTrue(parser.isRenameTable)
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "drop column b, rename as something_else"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.alterStatementOptions, statement)
test.S(t).ExpectTrue(parser.isRenameTable)
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "engine=innodb rename as something_else"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectTrue(parser.isRenameTable)
}
{
parser := NewParser()
parser := NewAlterTableParser()
statement := "rename as something_else, engine=innodb"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectTrue(parser.isRenameTable)
}
}
func TestParseAlterStatementExplicitTable(t *testing.T) {
{
parser := NewAlterTableParser()
statement := "drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "")
test.S(t).ExpectEquals(parser.explicitTable, "")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table tbl drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table `tbl` drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table `scm with spaces`.`tbl` drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm with spaces")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table `scm`.`tbl with spaces` drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm")
test.S(t).ExpectEquals(parser.explicitTable, "tbl with spaces")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table `scm`.tbl drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table scm.`tbl` drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table scm.tbl drop column b"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b"}))
}
{
parser := NewAlterTableParser()
statement := "alter table scm.tbl drop column b, add index idx(i)"
err := parser.ParseAlterStatement(statement)
test.S(t).ExpectNil(err)
test.S(t).ExpectEquals(parser.explicitSchema, "scm")
test.S(t).ExpectEquals(parser.explicitTable, "tbl")
test.S(t).ExpectEquals(parser.alterStatementOptions, "drop column b, add index idx(i)")
test.S(t).ExpectTrue(reflect.DeepEqual(parser.alterTokens, []string{"drop column b", "add index idx(i)"}))
}
}