mirror of https://github.com/perkeep/perkeep.git
147 lines
3.8 KiB
Go
147 lines
3.8 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package mysqlindexer
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import (
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"database/sql"
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"fmt"
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"os"
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"camlistore.org/pkg/blobserver"
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"camlistore.org/pkg/index"
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"camlistore.org/pkg/jsonconfig"
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_ "camlistore.org/third_party/github.com/ziutek/mymysql/godrv"
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)
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type myIndexStorage struct {
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host, user, password, database string
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db *sql.DB
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}
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var _ index.IndexStorage = (*myIndexStorage)(nil)
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type batchTx struct {
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tx *sql.Tx
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err error // sticky
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}
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func (b *batchTx) Set(key, value string) {
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if b.err != nil {
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return
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}
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_, b.err = b.tx.Exec("REPLACE INTO rows (k, v) VALUES (?, ?)", key, value)
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}
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func (b *batchTx) Delete(key string) {
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if b.err != nil {
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return
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}
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_, b.err = b.tx.Exec("DELETE FROM rows WHERE k=?", key)
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}
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func (ms *myIndexStorage) BeginBatch() index.BatchMutation {
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tx, err := ms.db.Begin()
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return &batchTx{
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tx: tx,
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err: err,
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}
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}
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func (ms *myIndexStorage) CommitBatch(b index.BatchMutation) error {
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bt, ok := b.(*batchTx)
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if !ok {
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return fmt.Errorf("wrong BatchMutation type %T", b)
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}
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if bt.err != nil {
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return bt.err
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}
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return bt.tx.Commit()
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}
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func (ms *myIndexStorage) Get(key string) (value string, err error) {
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err = ms.db.QueryRow("SELECT v FROM rows WHERE k=?", key).Scan(&value)
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return
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}
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func (ms *myIndexStorage) Set(key, value string) error {
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_, err := ms.db.Exec("REPLACE INTO rows (k, v) VALUES (?, ?)", key, value)
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return err
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}
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func (ms *myIndexStorage) Delete(key string) error {
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_, err := ms.db.Exec("DELETE FROM rows WHERE k=?", key)
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return err
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}
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func (ms *myIndexStorage) Find(key string) index.Iterator {
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panic("TODO(bradfitz): implement")
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}
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func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, error) {
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is := &myIndexStorage{
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host: config.OptionalString("host", "localhost"),
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user: config.RequiredString("user"),
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password: config.OptionalString("password", ""),
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database: config.RequiredString("database"),
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}
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if err := config.Validate(); err != nil {
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return nil, err
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}
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db, err := sql.Open("mymysql", is.database+"/"+is.user+"/"+is.password)
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if err != nil {
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return nil, err
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}
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is.db = db
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if err := is.ping(); err != nil {
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return nil, err
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}
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indexer := index.New(is)
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version, err := is.SchemaVersion()
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if err != nil {
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return nil, fmt.Errorf("error getting schema version (need to init database?): %v", err)
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}
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if version != requiredSchemaVersion {
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if os.Getenv("CAMLI_ADVERTISED_PASSWORD") != "" {
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// Good signal that we're using the dev-server script, so help out
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// the user with a more useful tip:
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return nil, fmt.Errorf("database schema version is %d; expect %d (run \"./dev-server --wipe\" to wipe both your blobs and re-populate the database schema)", version, requiredSchemaVersion)
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}
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return nil, fmt.Errorf("database schema version is %d; expect %d (need to re-init/upgrade database?)",
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version, requiredSchemaVersion)
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}
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return indexer, nil
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}
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func init() {
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blobserver.RegisterStorageConstructor("mysqlindexer", blobserver.StorageConstructor(newFromConfig))
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}
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func (mi *myIndexStorage) ping() error {
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// TODO(bradfitz): something more efficient here?
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_, err := mi.SchemaVersion()
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return err
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}
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func (mi *myIndexStorage) SchemaVersion() (version int, err error) {
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err = mi.db.QueryRow("SELECT value FROM meta WHERE metakey='version'").Scan(&version)
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return
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}
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