mirror of https://github.com/perkeep/perkeep.git
123 lines
3.5 KiB
Go
123 lines
3.5 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 mysql
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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/index/sqlindex"
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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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*sqlindex.Storage
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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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// NewStorage returns an IndexStorage implementation of the described MySQL database.
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// This exists mostly for testing and does not initialize the schema.
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func NewStorage(host, user, password, dbname string) (index.IndexStorage, error) {
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// TODO(bradfitz): host is ignored; how to plumb it through with mymysql?
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dsn := dbname+"/"+user+"/"+password
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db, err := sql.Open("mymysql", dsn)
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if err != nil {
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return nil, err
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}
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// TODO(bradfitz): ping db, check that it's reachable.
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return &myIndexStorage{
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db: db,
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Storage: &sqlindex.Storage{
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DB: db,
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},
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host: host,
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user: user,
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password: password,
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database: dbname,
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}, nil
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}
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func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, error) {
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var (
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blobPrefix = config.RequiredString("blobSource")
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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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sto, err := ld.GetStorage(blobPrefix)
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if err != nil {
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return nil, err
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}
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isto, err := NewStorage(host, user, password, database)
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if err != nil {
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return nil, err
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}
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is := isto.(*myIndexStorage)
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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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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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ix := index.New(is)
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ix.BlobSource = sto
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// Good enough, for now:
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ix.KeyFetcher = ix.BlobSource
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return ix, 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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