mirror of https://github.com/perkeep/perkeep.git
106 lines
2.7 KiB
Go
106 lines
2.7 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
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import (
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"bytes"
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"database/sql"
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"fmt"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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)
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const requiredSchemaVersion = 1
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func SchemaVersion() int {
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return requiredSchemaVersion
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}
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func SQLCreateTables() []string {
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return []string{
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`CREATE TABLE rows (
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k VARCHAR(255) NOT NULL PRIMARY KEY,
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v VARCHAR(255))`,
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`CREATE TABLE meta (
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metakey VARCHAR(255) NOT NULL PRIMARY KEY,
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value VARCHAR(255) NOT NULL)`,
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}
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}
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// IsWALCapable checks if the installed sqlite3 library can
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// use Write-Ahead Logging (i.e version >= 3.7.0)
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func IsWALCapable() bool {
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// TODO(mpl): alternative to make it work on windows
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cmdPath, err := exec.LookPath("pkg-config")
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if err != nil {
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log.Printf("Could not find pkg-config to check sqlite3 lib version: %v", err)
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return false
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}
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var stderr bytes.Buffer
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cmd := exec.Command(cmdPath, "--modversion", "sqlite3")
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cmd.Stderr = &stderr
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if runtime.GOOS == "darwin" && os.Getenv("PKG_CONFIG_PATH") == "" {
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matches, err := filepath.Glob("/usr/local/Cellar/sqlite/*/lib/pkgconfig/sqlite3.pc")
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if err == nil && len(matches) > 0 {
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cmd.Env = append(os.Environ(), "PKG_CONFIG_PATH="+filepath.Dir(matches[0]))
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}
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}
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out, err := cmd.Output()
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if err != nil {
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log.Printf("Could not check sqlite3 version: %v\n", stderr.String())
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return false
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}
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version := strings.TrimRight(string(out), "\n")
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return version >= "3.7.0"
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}
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// EnableWAL returns the statement to enable Write-Ahead Logging,
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// which improves SQLite concurrency.
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// Requires SQLite >= 3.7.0
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func EnableWAL() string {
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return "PRAGMA journal_mode = WAL"
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}
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// initDB creates a new sqlite database based on the file at path.
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func initDB(path string) error {
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db, err := sql.Open("sqlite3", path)
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if err != nil {
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return err
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}
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defer db.Close()
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for _, tableSql := range SQLCreateTables() {
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if _, err := db.Exec(tableSql); err != nil {
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return err
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}
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}
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if IsWALCapable() {
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if _, err := db.Exec(EnableWAL()); err != nil {
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return err
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}
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} else {
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log.Print("WARNING: An SQLite DB without Write Ahead Logging will most likely fail. See http://camlistore.org/issues/114")
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}
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_, err = db.Exec(fmt.Sprintf(`REPLACE INTO meta VALUES ('version', '%d')`, SchemaVersion()))
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return err
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}
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