mirror of
https://github.com/lightningnetwork/lnd.git
synced 2024-11-19 18:10:34 +01:00
304 lines
9.1 KiB
Go
304 lines
9.1 KiB
Go
//go:build !js
|
|
// +build !js
|
|
|
|
package kvdb
|
|
|
|
import (
|
|
"context"
|
|
"crypto/sha256"
|
|
"encoding/binary"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
_ "github.com/btcsuite/btcwallet/walletdb/bdb" // Import to register backend.
|
|
)
|
|
|
|
const (
|
|
// DefaultTempDBFileName is the default name of the temporary bolt DB
|
|
// file that we'll use to atomically compact the primary DB file on
|
|
// startup.
|
|
DefaultTempDBFileName = "temp-dont-use.db"
|
|
|
|
// LastCompactionFileNameSuffix is the suffix we append to the file name
|
|
// of a database file to record the timestamp when the last compaction
|
|
// occurred.
|
|
LastCompactionFileNameSuffix = ".last-compacted"
|
|
)
|
|
|
|
var (
|
|
byteOrder = binary.BigEndian
|
|
)
|
|
|
|
// fileExists returns true if the file exists, and false otherwise.
|
|
func fileExists(path string) bool {
|
|
if _, err := os.Stat(path); err != nil {
|
|
if os.IsNotExist(err) {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// BoltBackendConfig is a struct that holds settings specific to the bolt
|
|
// database backend.
|
|
type BoltBackendConfig struct {
|
|
// DBPath is the directory path in which the database file should be
|
|
// stored.
|
|
DBPath string
|
|
|
|
// DBFileName is the name of the database file.
|
|
DBFileName string
|
|
|
|
// NoFreelistSync, if true, prevents the database from syncing its
|
|
// freelist to disk, resulting in improved performance at the expense of
|
|
// increased startup time.
|
|
NoFreelistSync bool
|
|
|
|
// AutoCompact specifies if a Bolt based database backend should be
|
|
// automatically compacted on startup (if the minimum age of the
|
|
// database file is reached). This will require additional disk space
|
|
// for the compacted copy of the database but will result in an overall
|
|
// lower database size after the compaction.
|
|
AutoCompact bool
|
|
|
|
// AutoCompactMinAge specifies the minimum time that must have passed
|
|
// since a bolt database file was last compacted for the compaction to
|
|
// be considered again.
|
|
AutoCompactMinAge time.Duration
|
|
|
|
// DBTimeout specifies the timeout value to use when opening the wallet
|
|
// database.
|
|
DBTimeout time.Duration
|
|
}
|
|
|
|
// GetBoltBackend opens (or creates if doesn't exits) a bbolt backed database
|
|
// and returns a kvdb.Backend wrapping it.
|
|
func GetBoltBackend(cfg *BoltBackendConfig) (Backend, error) {
|
|
dbFilePath := filepath.Join(cfg.DBPath, cfg.DBFileName)
|
|
|
|
// Is this a new database?
|
|
if !fileExists(dbFilePath) {
|
|
if !fileExists(cfg.DBPath) {
|
|
if err := os.MkdirAll(cfg.DBPath, 0700); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return Create(
|
|
BoltBackendName, dbFilePath,
|
|
cfg.NoFreelistSync, cfg.DBTimeout,
|
|
)
|
|
}
|
|
|
|
// This is an existing database. We might want to compact it on startup
|
|
// to free up some space.
|
|
if cfg.AutoCompact {
|
|
if err := compactAndSwap(cfg); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return Open(
|
|
BoltBackendName, dbFilePath,
|
|
cfg.NoFreelistSync, cfg.DBTimeout,
|
|
)
|
|
}
|
|
|
|
// compactAndSwap will attempt to write a new temporary DB file to disk with
|
|
// the compacted database content, then atomically swap (via rename) the old
|
|
// file for the new file by updating the name of the new file to the old.
|
|
func compactAndSwap(cfg *BoltBackendConfig) error {
|
|
sourceName := cfg.DBFileName
|
|
|
|
// If the main DB file isn't set, then we can't proceed.
|
|
if sourceName == "" {
|
|
return fmt.Errorf("cannot compact DB with empty name")
|
|
}
|
|
sourceFilePath := filepath.Join(cfg.DBPath, sourceName)
|
|
tempDestFilePath := filepath.Join(cfg.DBPath, DefaultTempDBFileName)
|
|
|
|
// Let's find out how long ago the last compaction of the source file
|
|
// occurred and possibly skip compacting it again now.
|
|
lastCompactionDate, err := lastCompactionDate(sourceFilePath)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot determine last compaction date of "+
|
|
"source DB file: %v", err)
|
|
}
|
|
compactAge := time.Since(lastCompactionDate)
|
|
if cfg.AutoCompactMinAge != 0 && compactAge <= cfg.AutoCompactMinAge {
|
|
log.Infof("Not compacting database file at %v, it was last "+
|
|
"compacted at %v (%v ago), min age is set to %v",
|
|
sourceFilePath, lastCompactionDate,
|
|
compactAge.Truncate(time.Second), cfg.AutoCompactMinAge)
|
|
return nil
|
|
}
|
|
|
|
log.Infof("Compacting database file at %v", sourceFilePath)
|
|
|
|
// If the old temporary DB file still exists, then we'll delete it
|
|
// before proceeding.
|
|
if _, err := os.Stat(tempDestFilePath); err == nil {
|
|
log.Infof("Found old temp DB @ %v, removing before swap",
|
|
tempDestFilePath)
|
|
|
|
err = os.Remove(tempDestFilePath)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to remove old temp DB file: "+
|
|
"%v", err)
|
|
}
|
|
}
|
|
|
|
// Now that we know the staging area is clear, we'll create the new
|
|
// temporary DB file and close it before we write the new DB to it.
|
|
tempFile, err := os.Create(tempDestFilePath)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to create temp DB file: %w", err)
|
|
}
|
|
if err := tempFile.Close(); err != nil {
|
|
return fmt.Errorf("unable to close file: %w", err)
|
|
}
|
|
|
|
// With the file created, we'll start the compaction and remove the
|
|
// temporary file all together once this method exits.
|
|
defer func() {
|
|
// This will only succeed if the rename below fails. If the
|
|
// compaction is successful, the file won't exist on exit
|
|
// anymore so no need to log an error here.
|
|
_ = os.Remove(tempDestFilePath)
|
|
}()
|
|
c := &compacter{
|
|
srcPath: sourceFilePath,
|
|
dstPath: tempDestFilePath,
|
|
dbTimeout: cfg.DBTimeout,
|
|
}
|
|
initialSize, newSize, err := c.execute()
|
|
if err != nil {
|
|
return fmt.Errorf("error during compact: %w", err)
|
|
}
|
|
|
|
log.Infof("DB compaction of %v successful, %d -> %d bytes (gain=%.2fx)",
|
|
sourceFilePath, initialSize, newSize,
|
|
float64(initialSize)/float64(newSize))
|
|
|
|
// We try to store the current timestamp in a file with the suffix
|
|
// .last-compacted so we can figure out how long ago the last compaction
|
|
// was. But since this shouldn't fail the compaction process itself, we
|
|
// only log the error. Worst case if this file cannot be written is that
|
|
// we compact on every startup.
|
|
err = updateLastCompactionDate(sourceFilePath)
|
|
if err != nil {
|
|
log.Warnf("Could not update last compaction timestamp in "+
|
|
"%s%s: %v", sourceFilePath,
|
|
LastCompactionFileNameSuffix, err)
|
|
}
|
|
|
|
log.Infof("Swapping old DB file from %v to %v", tempDestFilePath,
|
|
sourceFilePath)
|
|
|
|
// Finally, we'll attempt to atomically rename the temporary file to
|
|
// the main back up file. If this succeeds, then we'll only have a
|
|
// single file on disk once this method exits.
|
|
return os.Rename(tempDestFilePath, sourceFilePath)
|
|
}
|
|
|
|
// lastCompactionDate returns the date the given database file was last
|
|
// compacted or a zero time.Time if no compaction was recorded before. The
|
|
// compaction date is read from a file in the same directory and with the same
|
|
// name as the DB file, but with the suffix ".last-compacted".
|
|
func lastCompactionDate(dbFile string) (time.Time, error) {
|
|
zeroTime := time.Unix(0, 0)
|
|
|
|
tsFile := fmt.Sprintf("%s%s", dbFile, LastCompactionFileNameSuffix)
|
|
if !fileExists(tsFile) {
|
|
return zeroTime, nil
|
|
}
|
|
|
|
tsBytes, err := os.ReadFile(tsFile)
|
|
if err != nil {
|
|
return zeroTime, err
|
|
}
|
|
|
|
tsNano := byteOrder.Uint64(tsBytes)
|
|
return time.Unix(0, int64(tsNano)), nil
|
|
}
|
|
|
|
// updateLastCompactionDate stores the current time as a timestamp in a file
|
|
// in the same directory and with the same name as the DB file, but with the
|
|
// suffix ".last-compacted".
|
|
func updateLastCompactionDate(dbFile string) error {
|
|
var tsBytes [8]byte
|
|
byteOrder.PutUint64(tsBytes[:], uint64(time.Now().UnixNano()))
|
|
|
|
tsFile := fmt.Sprintf("%s%s", dbFile, LastCompactionFileNameSuffix)
|
|
return os.WriteFile(tsFile, tsBytes[:], 0600)
|
|
}
|
|
|
|
// GetTestBackend opens (or creates if doesn't exist) a bbolt or etcd
|
|
// backed database (for testing), and returns a kvdb.Backend and a cleanup
|
|
// func. Whether to create/open bbolt or embedded etcd database is based
|
|
// on the TestBackend constant which is conditionally compiled with build tag.
|
|
// The passed path is used to hold all db files, while the name is only used
|
|
// for bbolt.
|
|
func GetTestBackend(path, name string) (Backend, func(), error) {
|
|
empty := func() {}
|
|
|
|
// Note that for tests, we expect only one db backend build flag
|
|
// (or none) to be set at a time and thus one of the following switch
|
|
// cases should ever be true
|
|
switch {
|
|
case PostgresBackend:
|
|
key := filepath.Join(path, name)
|
|
keyHash := sha256.Sum256([]byte(key))
|
|
|
|
f, err := NewPostgresFixture("test_" + hex.EncodeToString(
|
|
keyHash[:]),
|
|
)
|
|
if err != nil {
|
|
return nil, func() {}, err
|
|
}
|
|
return f.DB(), func() {
|
|
_ = f.DB().Close()
|
|
}, nil
|
|
|
|
case EtcdBackend:
|
|
etcdConfig, cancel, err := StartEtcdTestBackend(path, 0, 0, "")
|
|
if err != nil {
|
|
return nil, empty, err
|
|
}
|
|
backend, err := Open(
|
|
EtcdBackendName, context.TODO(), etcdConfig,
|
|
)
|
|
return backend, cancel, err
|
|
|
|
case SqliteBackend:
|
|
dbPath := filepath.Join(path, name)
|
|
keyHash := sha256.Sum256([]byte(dbPath))
|
|
sqliteDb, err := StartSqliteTestBackend(
|
|
path, name, "test_"+hex.EncodeToString(keyHash[:]),
|
|
)
|
|
if err != nil {
|
|
return nil, empty, err
|
|
}
|
|
|
|
return sqliteDb, func() {
|
|
_ = sqliteDb.Close()
|
|
}, nil
|
|
|
|
default:
|
|
db, err := GetBoltBackend(&BoltBackendConfig{
|
|
DBPath: path,
|
|
DBFileName: name,
|
|
NoFreelistSync: true,
|
|
DBTimeout: DefaultDBTimeout,
|
|
})
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return db, empty, nil
|
|
}
|
|
}
|