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kv_mdbx: atomic closed flag (#464)

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This commit is contained in:
Alex Sharov 2022-05-24 12:20:19 +07:00 committed by GitHub
parent 2bfb6d70bb
commit 9821dcdff5
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 18 deletions
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28
kv/mdbx/kv_mdbx.go
View File

@ -34,6 +34,7 @@ import (
"github.com/ledgerwatch/erigon-lib/kv"
"github.com/ledgerwatch/log/v3"
"github.com/torquem-ch/mdbx-go/mdbx"
"go.uber.org/atomic"
)
const NonExistingDBI kv.DBI = 999_999_999
@ -324,6 +325,7 @@ type MdbxKV struct {
opts MdbxOpts
txSize uint64
roTxsLimiter chan struct{} // does limit amount of concurrent Ro transactions - in most casess runtime.NumCPU() is good value for this channel capacity - this channel can be shared with other components (like Decompressor)
closed atomic.Bool
}
// openDBIs - first trying to open existing DBI's in RO transaction
@ -365,9 +367,10 @@ func (db *MdbxKV) openDBIs(buckets []string) error {
// Close closes db
// All transactions must be closed before closing the database.
func (db *MdbxKV) Close() {
if db.env == nil {
if db.closed.Load() {
return
}
db.closed.Store(true)
db.wg.Wait()
db.env.Close()
db.env = nil
@ -380,14 +383,14 @@ func (db *MdbxKV) Close() {
}
func (db *MdbxKV) BeginRo(ctx context.Context) (txn kv.Tx, err error) {
if db.closed.Load() {
return nil, fmt.Errorf("db closed")
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case db.roTxsLimiter <- struct{}{}:
}
if db.env == nil {
return nil, fmt.Errorf("db closed")
}
defer func() {
if err == nil {
@ -408,7 +411,7 @@ func (db *MdbxKV) BeginRo(ctx context.Context) (txn kv.Tx, err error) {
}
func (db *MdbxKV) BeginRw(_ context.Context) (txn kv.RwTx, err error) {
if db.env == nil {
if db.closed.Load() {
return nil, fmt.Errorf("db closed")
}
runtime.LockOSThread()
@ -621,12 +624,9 @@ func (tx *MdbxTx) ListBuckets() ([]string, error) {
}
func (db *MdbxKV) View(ctx context.Context, f func(tx kv.Tx) error) (err error) {
if db.env == nil {
if db.closed.Load() {
return fmt.Errorf("db closed")
}
db.wg.Add(1)
defer db.wg.Done()
// can't use db.evn.View method - because it calls commit for read transactions - it conflicts with write transactions.
tx, err := db.BeginRo(ctx)
if err != nil {
@ -638,11 +638,9 @@ func (db *MdbxKV) View(ctx context.Context, f func(tx kv.Tx) error) (err error)
}
func (db *MdbxKV) Update(ctx context.Context, f func(tx kv.RwTx) error) (err error) {
if db.env == nil {
if db.closed.Load() {
return fmt.Errorf("db closed")
}
db.wg.Add(1)
defer db.wg.Done()
tx, err := db.BeginRw(ctx)
if err != nil {
@ -754,9 +752,6 @@ func (tx *MdbxTx) ExistsBucket(bucket string) (bool, error) {
}
func (tx *MdbxTx) Commit() error {
if tx.db.env == nil {
return fmt.Errorf("db closed")
}
if tx.tx == nil {
return nil
}
@ -815,9 +810,6 @@ func (tx *MdbxTx) Commit() error {
}
func (tx *MdbxTx) Rollback() {
if tx.db.env == nil {
return
}
if tx.tx == nil {
return
}