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Stop leaking go routines if something with AllKeys went wrong.

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This commit is contained in:
Sascha L. Teichmann 2014-08-31 19:21:58 +02:00
parent 48259f14a6
commit 3929ffc3b2
4 changed files with 22 additions and 10 deletions
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2
backend.go
View File

@ -9,7 +9,7 @@ type (
Fetch(hash, key []byte) ([]byte, error)
InTransaction() bool
Store(hash, key, value []byte) (bool, error)
AllKeys(hash []byte) (chan []byte, int, error)
AllKeys(hash []byte, done chan struct{}) (chan []byte, int, error)
BeginTransaction() error
CommitTransaction() error
Close() error

13
connection.go
View File

@ -100,10 +100,15 @@ func (c *Connection) Exec() bool {
}
func (c *Connection) Hkeys(hash []byte) bool {
var err error
var n int
var keys chan []byte
if keys, n, err = c.session.AllKeys(hash); err != nil {
var (
err error
n int
keys chan []byte
done = make(chan struct{})
)
defer close(done)
if keys, n, err = c.session.AllKeys(hash, done); err != nil {
return c.writeError(err)
}

8
leveldb.go
View File

@ -175,7 +175,7 @@ func (ldbs *LevelDBSession) CommitTransaction() (err error) {
return
}
func (ldbs *LevelDBSession) AllKeys(hash []byte) (keys chan []byte, n int, err error) {
func (ldbs *LevelDBSession) AllKeys(hash []byte, done chan struct{}) (keys chan []byte, n int, err error) {
ldbs.backend.mutex.RLock()
ro := leveldb.NewReadOptions()
@ -205,7 +205,11 @@ func (ldbs *LevelDBSession) AllKeys(hash []byte) (keys chan []byte, n int, err e
encoder := ldbs.backend.encoder
for ; it.Valid(); it.Next() {
if key, err := encoder(it.Key()); err == nil {
keys <- key
select {
case keys <- key:
case <-done:
return
}
} else {
log.Printf("WARN: %s\n", err)
return

9
sqlite.go
View File

@ -228,7 +228,7 @@ func (ss *SqliteSession) CommitTransaction() error {
return tx.Commit()
}
func (ss *SqliteSession) AllKeys(hash []byte) (keys chan []byte, n int, err error) {
func (ss *SqliteSession) AllKeys(hash []byte, done chan struct{}) (keys chan []byte, n int, err error) {
globalLock.RLock()
countStmt := ss.txStmt(ss.backend.countStmt)
@ -264,8 +264,11 @@ func (ss *SqliteSession) AllKeys(hash []byte) (keys chan []byte, n int, err erro
log.Printf("Cannot encode key: %d %s\n", key, err)
break
}
keys <- encoded
select {
case keys <- encoded:
case <-done:
return
}
}
}()