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init.go
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init.go
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package channeldbservice
import (
"io/ioutil"
"os"
"path"
"strings"
"github.com/breez/breez/chainservice"
"github.com/breez/breez/config"
breezlog "github.com/breez/breez/log"
"github.com/breez/breez/refcount"
"github.com/btcsuite/btclog"
"github.com/lightningnetwork/lnd"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/kvdb"
)
const (
directoryPattern = "data/graph/{{network}}/"
dbName = "channel.db"
)
var (
serviceRefCounter refcount.ReferenceCountable
chanDB *channeldb.DB
logger btclog.Logger
)
// Get returns a Ch
func Get(workingDir string) (db *channeldb.DB, cleanupFn func() error, err error) {
service, release, err := serviceRefCounter.Get(
func() (interface{}, refcount.ReleaseFunc, error) {
return newService(workingDir)
},
)
if err != nil {
return nil, nil, err
}
return service.(*channeldb.DB), release, err
}
func newService(workingDir string) (db *channeldb.DB, rel refcount.ReleaseFunc, err error) {
chanDB, err = createService(workingDir)
if err != nil {
return nil, nil, err
}
return chanDB, release, err
}
func release() error {
return chanDB.Close()
}
func compactDB(graphDir string) error {
dbPath := path.Join(graphDir, dbName)
f, err := os.Stat(dbPath)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
logger.Infof("channel db size = %v", f.Size())
if f.Size() <= 400000000 {
return nil
}
newFile, err := ioutil.TempFile(graphDir, "cdb-compact")
if err != nil {
return err
}
if err = chainservice.BoltCopy(dbPath, newFile.Name(),
func(keyPath [][]byte, k []byte, v []byte) bool { return false }); err != nil {
return err
}
if err = os.Rename(dbPath, dbPath+".old"); err != nil {
return err
}
if err = os.Rename(newFile.Name(), dbPath); err != nil {
logger.Criticalf("Error when renaming the new channeldb file: %v", err)
return err
}
logger.Infof("channel.db was compacted because it's too big")
return nil
}
func deleteOldDB(graphDir string) error {
oldDBPath := path.Join(graphDir, dbName+".old")
err := os.Remove(oldDBPath)
logger.Infof("os.Remove(%v): %v", oldDBPath, err)
return err
}
func deleteOldBootstrap(workingDir string) error {
bootstrap := path.Join(workingDir, "bootstrap")
err := os.RemoveAll(bootstrap)
logger.Infof("os.RemoveAll(%v): %v", bootstrap, err)
return err
}
func createService(workingDir string) (*channeldb.DB, error) {
config, err := config.GetConfig(workingDir)
if err != nil {
return nil, err
}
if logger == nil {
logger, err = breezlog.GetLogger(workingDir, "CHANNELDB")
if err != nil {
return nil, err
}
logger.SetLevel(btclog.LevelDebug)
}
graphDir := path.Join(workingDir, strings.Replace(directoryPattern, "{{network}}", config.Network, -1))
if err = compactDB(graphDir); err != nil {
logger.Errorf("Error in compactDB: %v", err)
}
logger.Infof("creating shared channeldb service.")
cfg := lnd.DefaultConfig()
cfg.StoreFinalHtlcResolutions = true
dbOptions := []channeldb.OptionModifier{
channeldb.OptionSetRejectCacheSize(cfg.Caches.RejectCacheSize),
channeldb.OptionSetChannelCacheSize(cfg.Caches.ChannelCacheSize),
channeldb.OptionSetBatchCommitInterval(cfg.DB.BatchCommitInterval),
channeldb.OptionDryRunMigration(cfg.DryRunMigration),
channeldb.OptionSetUseGraphCache(!cfg.DB.NoGraphCache),
channeldb.OptionKeepFailedPaymentAttempts(cfg.KeepFailedPaymentAttempts),
channeldb.OptionPruneRevocationLog(cfg.DB.PruneRevocation),
channeldb.OptionSetPreAllocCacheNumNodes(channeldb.DefaultPreAllocCacheNumNodes),
channeldb.OptionStoreFinalHtlcResolutions(cfg.StoreFinalHtlcResolutions),
}
opts := channeldb.DefaultOptions()
backend, err := kvdb.GetBoltBackend(&kvdb.BoltBackendConfig{
DBPath: graphDir,
DBFileName: dbName,
NoFreelistSync: false,
AutoCompact: opts.AutoCompact,
AutoCompactMinAge: opts.AutoCompactMinAge,
DBTimeout: opts.DBTimeout,
})
if err != nil {
return nil, err
}
chanDB, err := channeldb.CreateWithBackend(
backend, dbOptions...,
)
if err != nil {
logger.Errorf("unable to open channeldb: %v", err)
return nil, err
}
deleteOldDB(graphDir)
deleteOldBootstrap(workingDir)
logger.Infof("channeldb was opened successfuly")
return chanDB, err
}