/
catalog.go
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/
catalog.go
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// Copyright 2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package analyzer
import (
"fmt"
"strings"
"sync"
"github.com/dolthub/go-mysql-server/internal/similartext"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression/function"
"github.com/dolthub/go-mysql-server/sql/grant_tables"
)
type Catalog struct {
GrantTables *grant_tables.GrantTables
provider sql.DatabaseProvider
builtInFunctions function.Registry
mu sync.RWMutex
locks sessionLocks
}
var _ sql.Catalog = (*Catalog)(nil)
var _ sql.FunctionProvider = (*Catalog)(nil)
type tableLocks map[string]struct{}
type dbLocks map[string]tableLocks
type sessionLocks map[uint32]dbLocks
// NewCatalog returns a new empty Catalog with the given provider
func NewCatalog(provider sql.DatabaseProvider) *Catalog {
return &Catalog{
GrantTables: grant_tables.CreateEmptyGrantTables(),
provider: provider,
builtInFunctions: function.NewRegistry(),
locks: make(sessionLocks),
}
}
func NewDatabaseProvider(dbs ...sql.Database) sql.DatabaseProvider {
return sql.NewDatabaseProvider(dbs...)
}
func (c *Catalog) AllDatabases() []sql.Database {
return c.provider.AllDatabases()
}
// CreateDatabase creates a new Database and adds it to the catalog.
func (c *Catalog) CreateDatabase(ctx *sql.Context, dbName string) error {
c.mu.Lock()
defer c.mu.Unlock()
mut, ok := c.provider.(sql.MutableDatabaseProvider)
if ok {
return mut.CreateDatabase(ctx, dbName)
} else {
return sql.ErrImmutableDatabaseProvider.New()
}
}
// RemoveDatabase removes a database from the catalog.
func (c *Catalog) RemoveDatabase(ctx *sql.Context, dbName string) error {
c.mu.Lock()
defer c.mu.Unlock()
mut, ok := c.provider.(sql.MutableDatabaseProvider)
if ok {
return mut.DropDatabase(ctx, dbName)
} else {
return sql.ErrImmutableDatabaseProvider.New()
}
}
func (c *Catalog) HasDB(db string) bool {
return c.provider.HasDatabase(db)
}
// Database returns the database with the given name.
func (c *Catalog) Database(db string) (sql.Database, error) {
if strings.ToLower(db) == "mysql" {
return c.GrantTables, nil
}
return c.provider.Database(db)
}
// LockTable adds a lock for the given table and session client. It is assumed
// the database is the current database in use.
func (c *Catalog) LockTable(ctx *sql.Context, table string) {
id := ctx.ID()
db := ctx.GetCurrentDatabase()
c.mu.Lock()
defer c.mu.Unlock()
if _, ok := c.locks[id]; !ok {
c.locks[id] = make(dbLocks)
}
if _, ok := c.locks[id][db]; !ok {
c.locks[id][db] = make(tableLocks)
}
c.locks[id][db][table] = struct{}{}
}
// UnlockTables unlocks all tables for which the given session client has a
// lock.
func (c *Catalog) UnlockTables(ctx *sql.Context, id uint32) error {
c.mu.Lock()
defer c.mu.Unlock()
var errors []string
for db, tables := range c.locks[id] {
for t := range tables {
database, err := c.provider.Database(db)
if err != nil {
return err
}
table, _, err := database.GetTableInsensitive(ctx, t)
if err == nil {
if lockable, ok := table.(sql.Lockable); ok {
if e := lockable.Unlock(ctx, id); e != nil {
errors = append(errors, e.Error())
}
}
} else {
errors = append(errors, err.Error())
}
}
}
delete(c.locks, id)
if len(errors) > 0 {
return fmt.Errorf("error unlocking tables for %d: %s", id, strings.Join(errors, ", "))
}
return nil
}
// Table returns the table in the given database with the given name.
func (c *Catalog) Table(ctx *sql.Context, dbName, tableName string) (sql.Table, sql.Database, error) {
c.mu.RLock()
defer c.mu.RUnlock()
db, err := c.Database(dbName)
if err != nil {
return nil, nil, err
}
tbl, ok, err := db.GetTableInsensitive(ctx, tableName)
if err != nil {
return nil, nil, err
} else if !ok {
return nil, nil, suggestSimilarTables(db, ctx, tableName)
}
return tbl, db, nil
}
// TableAsOf returns the table in the given database with the given name, as it existed at the time given. The database
// named must support timed queries.
func (c *Catalog) TableAsOf(ctx *sql.Context, dbName, tableName string, asOf interface{}) (sql.Table, sql.Database, error) {
c.mu.RLock()
defer c.mu.RUnlock()
db, err := c.Database(dbName)
if err != nil {
return nil, nil, err
}
versionedDb, ok := db.(sql.VersionedDatabase)
if !ok {
return nil, nil, sql.ErrAsOfNotSupported.New(tableName)
}
tbl, ok, err := versionedDb.GetTableInsensitiveAsOf(ctx, tableName, asOf)
if err != nil {
return nil, nil, err
} else if !ok {
return nil, nil, suggestSimilarTablesAsOf(versionedDb, ctx, tableName, asOf)
}
return tbl, versionedDb, nil
}
// RegisterFunction registers the functions given, adding them to the built-in functions.
// Integrators with custom functions should typically use the FunctionProvider interface instead.
func (c *Catalog) RegisterFunction(fns ...sql.Function) {
for _, fn := range fns {
err := c.builtInFunctions.Register(fn)
if err != nil {
panic(err)
}
}
}
// Function returns the function with the name given, or sql.ErrFunctionNotFound if it doesn't exist
func (c *Catalog) Function(name string) (sql.Function, error) {
if fp, ok := c.provider.(sql.FunctionProvider); ok {
f, err := fp.Function(name)
if err != nil && !sql.ErrFunctionNotFound.Is(err) {
return nil, err
} else if f != nil {
return f, nil
}
}
return c.builtInFunctions.Function(name)
}
func suggestSimilarTables(db sql.Database, ctx *sql.Context, tableName string) error {
tableNames, err := db.GetTableNames(ctx)
if err != nil {
return err
}
similar := similartext.Find(tableNames, tableName)
return sql.ErrTableNotFound.New(tableName + similar)
}
func suggestSimilarTablesAsOf(db sql.VersionedDatabase, ctx *sql.Context, tableName string, time interface{}) error {
tableNames, err := db.GetTableNamesAsOf(ctx, time)
if err != nil {
return err
}
similar := similartext.Find(tableNames, tableName)
return sql.ErrTableNotFound.New(tableName + similar)
}