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spanner.go
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spanner.go
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package spanner
import (
"context"
"fmt"
"strings"
"cloud.google.com/go/spanner"
"github.com/k1LoW/tbls/schema"
"github.com/pkg/errors"
"google.golang.org/api/iterator"
)
type Spanner struct {
ctx context.Context
client *spanner.Client
}
// New return new Spanner
func New(ctx context.Context, client *spanner.Client) (*Spanner, error) {
return &Spanner{
ctx: ctx,
client: client,
}, nil
}
type interleave struct {
tableName string
parentTableName string
onDeleteAction string
}
func (sp *Spanner) Analyze(s *schema.Schema) error {
d, err := sp.Info()
if err != nil {
return errors.WithStack(err)
}
s.Driver = d
// tables / constraints
tableStmt := spanner.Statement{SQL: `
SELECT
TABLE_NAME, PARENT_TABLE_NAME, ON_DELETE_ACTION
FROM
INFORMATION_SCHEMA.TABLES
WHERE
TABLE_CATALOG = '' AND TABLE_SCHEMA = '';
`}
tableIter := sp.client.Single().Query(sp.ctx, tableStmt)
defer tableIter.Stop()
tables := []*schema.Table{}
interleaves := []interleave{}
tableType := "BASIC TABLE"
for {
tableRaw, err := tableIter.Next()
if err == iterator.Done {
break
}
if err != nil {
return errors.WithStack(err)
}
var (
tableName spanner.NullString
parentTableName spanner.NullString
onDeleteAction spanner.NullString
)
if err := tableRaw.Columns(&tableName, &parentTableName, &onDeleteAction); err != nil {
return errors.WithStack(err)
}
table := &schema.Table{
Name: tableName.StringVal,
Type: tableType,
}
if parentTableName.StringVal != "" {
interleaves = append(interleaves, interleave{
tableName: tableName.StringVal,
parentTableName: parentTableName.StringVal,
onDeleteAction: onDeleteAction.StringVal,
})
}
// columns
columnStmt := spanner.Statement{
SQL: `
SELECT
COLUMN_NAME, IS_NULLABLE, SPANNER_TYPE
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE
TABLE_NAME = @tableName AND TABLE_CATALOG = '' AND TABLE_SCHEMA = ''
ORDER BY ORDINAL_POSITION ASC;
`,
Params: map[string]interface{}{"tableName": tableName},
}
columnIter := sp.client.Single().Query(sp.ctx, columnStmt)
columns := []*schema.Column{}
for {
columnRow, err := columnIter.Next()
if err == iterator.Done {
columnIter.Stop()
break
}
if err != nil {
columnIter.Stop()
return errors.WithStack(err)
}
var (
columnName string
isNullable string
columnType string
)
if err := columnRow.Columns(&columnName, &isNullable, &columnType); err != nil {
columnIter.Stop()
return errors.WithStack(err)
}
column := &schema.Column{
Name: columnName,
Type: columnType,
Nullable: convertColumnNullable(isNullable),
}
// column options
optionStmt := spanner.Statement{
SQL: `
SELECT
OPTION_NAME, OPTION_VALUE
FROM
INFORMATION_SCHEMA.COLUMN_OPTIONS
WHERE
TABLE_NAME = @tableName AND COLUMN_NAME = @columnName AND TABLE_CATALOG = '' AND TABLE_SCHEMA = '';
`,
Params: map[string]interface{}{"tableName": tableName, "columnName": columnName},
}
optionIter := sp.client.Single().Query(sp.ctx, optionStmt)
for {
optionRow, err := optionIter.Next()
if err == iterator.Done {
optionIter.Stop()
break
}
if err != nil {
optionIter.Stop()
return errors.WithStack(err)
}
var (
optionName string
optionValue string
)
if err := optionRow.Columns(&optionName, &optionValue); err != nil {
optionIter.Stop()
return errors.WithStack(err)
}
column.Type = fmt.Sprintf("%s (%s=%s)", column.Type, optionName, optionValue)
}
optionIter.Stop()
columns = append(columns, column)
}
columnIter.Stop()
table.Columns = columns
// indexes / constraints
indexStmt := spanner.Statement{
SQL: `
SELECT
c.INDEX_NAME, c.INDEX_TYPE, ARRAY_TO_STRING(ARRAY(
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.INDEX_COLUMNS
WHERE TABLE_NAME = c.TABLE_NAME AND INDEX_NAME = c.INDEX_NAME AND INDEX_TYPE = c.INDEX_TYPE AND ORDINAL_POSITION IS NOT NULL
ORDER BY ORDINAL_POSITION ASC
), ", ") AS columns,
ARRAY_TO_STRING(ARRAY(
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.INDEX_COLUMNS
WHERE TABLE_NAME = c.TABLE_NAME AND INDEX_NAME = c.INDEX_NAME AND INDEX_TYPE = c.INDEX_TYPE AND ORDINAL_POSITION IS NULL
ORDER BY INDEX_NAME ASC
), ", ") AS storing_columns,
i.PARENT_TABLE_NAME, i.IS_UNIQUE, i.IS_NULL_FILTERED, i.INDEX_STATE
FROM
INFORMATION_SCHEMA.INDEX_COLUMNS AS c
INNER JOIN INFORMATION_SCHEMA.INDEXES AS i ON i.TABLE_NAME = c.TABLE_NAME AND i.INDEX_NAME = c.INDEX_NAME
WHERE
c.TABLE_CATALOG = '' AND c.TABLE_SCHEMA = '' AND c.TABLE_NAME = @tableName
GROUP BY c.TABLE_CATALOG, c.TABLE_SCHEMA, c.TABLE_NAME, c.INDEX_NAME, c.INDEX_TYPE, i.PARENT_TABLE_NAME, i.IS_UNIQUE, i.IS_NULL_FILTERED, i.INDEX_STATE;
`,
Params: map[string]interface{}{"tableName": tableName},
}
indexIter := sp.client.Single().Query(sp.ctx, indexStmt)
indexes := []*schema.Index{}
constraints := []*schema.Constraint{}
for {
indexRow, err := indexIter.Next()
if err == iterator.Done {
indexIter.Stop()
break
}
if err != nil {
indexIter.Stop()
return errors.WithStack(err)
}
var (
indexName string
indexType string
columns string
storingColumns string
parentTableName spanner.NullString
isUnique bool
isNullFiltered bool
indexState spanner.NullString
)
if err := indexRow.Columns(&indexName, &indexType, &columns, &storingColumns, &parentTableName, &isUnique, &isNullFiltered, &indexState); err != nil {
indexIter.Stop()
return errors.WithStack(err)
}
switch indexType {
case "INDEX":
var (
strUnique string
strNullFiltered string
strInterleave string
strStoringColumns string
)
if isUnique {
strUnique = "UNIQUE "
}
if isNullFiltered {
strNullFiltered = "NULL_FILTERED "
}
if storingColumns != "" {
strStoringColumns = fmt.Sprintf(" STORING (%s)", storingColumns)
}
if parentTableName.StringVal != "" {
strInterleave = fmt.Sprintf(", INTERLEAVE IN %s", parentTableName.StringVal)
}
indexDef := fmt.Sprintf("CREATE %s%sINDEX %s ON %s (%s)%s%s", strUnique, strNullFiltered, indexName, table.Name, columns, strStoringColumns, strInterleave)
index := &schema.Index{
Name: indexName,
Def: indexDef,
Table: &table.Name,
Columns: strings.Split(columns, ", "),
}
indexes = append(indexes, index)
case "PRIMARY_KEY":
constraint := &schema.Constraint{
Name: "PRIMARY_KEY",
Type: "PRIMARY_KEY",
Def: fmt.Sprintf("PRIMARY KEY(%s)", columns),
Table: &table.Name,
Columns: strings.Split(columns, ", "),
ReferencedTable: nil,
ReferencedColumns: []string{},
}
constraints = append(constraints, constraint)
default:
}
}
indexIter.Stop()
table.Indexes = indexes
table.Constraints = constraints
tables = append(tables, table)
}
s.Tables = tables
// interleaves
relations := []*schema.Relation{}
for _, i := range interleaves {
t, err := s.FindTableByName(i.tableName)
if err != nil {
return err
}
pt, err := s.FindTableByName(i.parentTableName)
if err != nil {
return err
}
def := fmt.Sprintf("INTERLEAVE IN PARENT %s ON DELETE %s", i.parentTableName, i.onDeleteAction) // #nosec
// constraints
constraint := &schema.Constraint{
Name: "INTERLEAVE",
Type: "INTERLEAVE",
Def: def,
Table: &t.Name,
Columns: []string{},
ReferencedTable: &pt.Name,
ReferencedColumns: []string{},
}
// relations
relation := &schema.Relation{
Table: t,
Columns: []*schema.Column{},
ParentTable: pt,
ParentColumns: []*schema.Column{},
Def: def,
Virtual: false,
}
for _, c := range t.Constraints {
if c.Type == "PRIMARY_KEY" {
constraint.Columns = c.Columns
for _, cName := range c.Columns {
column, err := t.FindColumnByName(cName)
if err != nil {
return err
}
column.ParentRelations = append(column.ParentRelations, relation)
relation.Columns = append(relation.Columns, column)
}
}
}
for _, c := range pt.Constraints {
if c.Type == "PRIMARY_KEY" {
constraint.ReferencedColumns = c.Columns
for _, cName := range c.Columns {
column, err := pt.FindColumnByName(cName)
if err != nil {
return err
}
column.ChildRelations = append(column.ChildRelations, relation)
relation.ParentColumns = append(relation.ParentColumns, column)
}
}
}
t.Constraints = append(t.Constraints, constraint)
relations = append(relations, relation)
}
s.Relations = relations
return nil
}
func (sp *Spanner) Info() (*schema.Driver, error) {
d := &schema.Driver{
Name: "spanner",
DatabaseVersion: "",
}
return d, nil
}
func convertColumnNullable(str string) bool {
return str != "NO"
}