mirror of https://github.com/perkeep/perkeep.git
134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
/*
|
|
Copyright 2012 Google 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 sqlite
|
|
|
|
import (
|
|
"database/sql"
|
|
"errors"
|
|
"fmt"
|
|
"os"
|
|
|
|
"camlistore.org/pkg/blobserver"
|
|
"camlistore.org/pkg/index"
|
|
"camlistore.org/pkg/index/sqlindex"
|
|
"camlistore.org/pkg/jsonconfig"
|
|
)
|
|
|
|
type storage struct {
|
|
*sqlindex.Storage
|
|
|
|
file string
|
|
db *sql.DB
|
|
}
|
|
|
|
var _ index.Storage = (*storage)(nil)
|
|
|
|
var compiled = false
|
|
|
|
// CompiledIn returns whether SQLite support is compiled in.
|
|
// If it returns false, the build tag "with_sqlite" was not specified.
|
|
func CompiledIn() bool {
|
|
return compiled
|
|
}
|
|
|
|
var ErrNotCompiled = errors.New("camlistored was not built with SQLite support. Rebuild with go get/install --tags=with_sqlite " + compileHint())
|
|
|
|
func compileHint() string {
|
|
if _, err := os.Stat("/etc/apt"); err == nil {
|
|
return " (Required: apt-get install libsqlite3-dev)"
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// NewStorage returns an index.Storage implementation of the described SQLite database.
|
|
// This exists mostly for testing and does not initialize the schema.
|
|
func NewStorage(file string) (index.Storage, error) {
|
|
if !compiled {
|
|
return nil, ErrNotCompiled
|
|
}
|
|
db, err := sql.Open("sqlite3", file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// TODO(bradfitz): ping db, check that it's reachable.
|
|
return &storage{
|
|
file: file,
|
|
db: db,
|
|
Storage: &sqlindex.Storage{
|
|
DB: db,
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (blobserver.Storage, error) {
|
|
var (
|
|
blobPrefix = config.RequiredString("blobSource")
|
|
file = config.RequiredString("file")
|
|
)
|
|
if err := config.Validate(); err != nil {
|
|
return nil, err
|
|
}
|
|
sto, err := ld.GetStorage(blobPrefix)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
isto, err := NewStorage(file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
is := isto.(*storage)
|
|
if err := is.ping(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
version, err := is.SchemaVersion()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error getting schema version (need to init database?): %v", err)
|
|
}
|
|
if version != requiredSchemaVersion {
|
|
if os.Getenv("CAMLI_ADVERTISED_PASSWORD") != "" {
|
|
// Good signal that we're using the dev-server script, so help out
|
|
// the user with a more useful tip:
|
|
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)
|
|
}
|
|
return nil, fmt.Errorf("database schema version is %d; expect %d (need to re-init/upgrade database?)",
|
|
version, requiredSchemaVersion)
|
|
}
|
|
|
|
ix := index.New(is)
|
|
ix.BlobSource = sto
|
|
// Good enough, for now:
|
|
ix.KeyFetcher = ix.BlobSource
|
|
|
|
return ix, nil
|
|
}
|
|
|
|
func init() {
|
|
blobserver.RegisterStorageConstructor("sqliteindexer", blobserver.StorageConstructor(newFromConfig))
|
|
}
|
|
|
|
func (mi *storage) ping() error {
|
|
// TODO(bradfitz): something more efficient here?
|
|
_, err := mi.SchemaVersion()
|
|
return err
|
|
}
|
|
|
|
func (mi *storage) SchemaVersion() (version int, err error) {
|
|
err = mi.db.QueryRow("SELECT value FROM meta WHERE metakey='version'").Scan(&version)
|
|
return
|
|
}
|