mirror of https://github.com/perkeep/perkeep.git
127 lines
3.4 KiB
Go
127 lines
3.4 KiB
Go
/*
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Copyright 2012 The Camlistore Authors.
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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 sqlite provides an implementation of sorted.KeyValue
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// using an SQLite database file.
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package sqlite
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import (
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"database/sql"
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"errors"
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"fmt"
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"os"
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"camlistore.org/pkg/jsonconfig"
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"camlistore.org/pkg/sorted"
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"camlistore.org/pkg/sorted/sqlkv"
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)
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func init() {
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sorted.RegisterKeyValue("sqlite", newKeyValueFromConfig)
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}
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func newKeyValueFromConfig(cfg jsonconfig.Obj) (sorted.KeyValue, error) {
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file := cfg.RequiredString("file")
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if err := cfg.Validate(); err != nil {
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return nil, err
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}
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return NewKeyValue(file)
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}
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// NewKeyValue returns a KeyValue implementation on top of
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// an SQLite database file.
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func NewKeyValue(file string) (sorted.KeyValue, error) {
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if !compiled {
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return nil, ErrNotCompiled
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}
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fi, err := os.Stat(file)
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if os.IsNotExist(err) || (err == nil && fi.Size() == 0) {
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if err := initDB(file); err != nil {
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return nil, fmt.Errorf("could not initialize sqlite DB at %s: %v", file, err)
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}
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}
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db, err := sql.Open("sqlite3", file)
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if err != nil {
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return nil, err
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}
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kv := &keyValue{
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file: file,
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db: db,
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KeyValue: &sqlkv.KeyValue{
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DB: db,
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Serial: true,
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},
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}
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version, err := kv.SchemaVersion()
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if err != nil {
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return nil, fmt.Errorf("error getting schema version (need to init database with 'camtool dbinit %s'?): %v", file, err)
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}
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if err := kv.ping(); err != nil {
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return nil, err
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}
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if version != requiredSchemaVersion {
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if os.Getenv("CAMLI_DEV_CAMLI_ROOT") != "" {
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// Good signal that we're using the devcam server, 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 \"devcam 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 kv, nil
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}
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type keyValue struct {
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*sqlkv.KeyValue
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file string
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db *sql.DB
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}
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var compiled = false
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// CompiledIn returns whether SQLite support is compiled in.
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// If it returns false, the build tag "with_sqlite" was not specified.
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func CompiledIn() bool {
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return compiled
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}
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var ErrNotCompiled = errors.New("camlistored was not built with SQLite support. If you built with make.go, use go run make.go --sqlite=true. If you used go get or get install, use go {get,install} --tags=with_sqlite" + compileHint())
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func compileHint() string {
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if _, err := os.Stat("/etc/apt"); err == nil {
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return " (Hint: apt-get install libsqlite3-dev)"
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}
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return ""
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}
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func (kv *keyValue) ping() error {
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// TODO(bradfitz): something more efficient here?
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_, err := kv.SchemaVersion()
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return err
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}
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func (kv *keyValue) SchemaVersion() (version int, err error) {
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err = kv.db.QueryRow("SELECT value FROM meta WHERE metakey='version'").Scan(&version)
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return
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}
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