What version of Go are you using (go version)?
$ go version go1.16 linux/amd64
What operating system are you using?
Ubuntu 20.04.2 LTS
What version of Badger are you using?
github.com/dgraph-io/badger/v3 v3.2011.1
Does this issue reproduce with the latest master?
yes
Steps to Reproduce the issue
streamFunc := func(db *badger.DB, prefix []byte) {
stream := db.NewStream()
stream.Prefix = prefix
stream.Send = func(buf *z.Buffer) error { return nil }
stream.Orchestrate(context.Background())
}
db, err := badger.Open(badger.DefaultOptions("").WithInMemory(true).WithReadOnly(false))
assert.NoError(t, err)
assert.NotPanics(t, func() { streamFunc(db, []byte("")) }) // OK
assert.NotPanics(t, func() { streamFunc(db, []byte("not_a_prefix")) }) // OK
db, err = badger.Open(badger.DefaultOptions("").WithInMemory(true).WithReadOnly(true))
assert.NoError(t, err)
assert.NotPanics(t, func() { streamFunc(db, []byte("")) }) // Not OK
assert.NotPanics(t, func() { streamFunc(db, []byte("not_a_prefix")) }) // Not OK
What Badger options were set?
See above in example
What did you do?
Ran stream on a readonly database scanning over a prefix which is not present
What did you expect to see?
The stream return with no matching entries
What did you see instead?
Badger panics - can’t catch with the assert package. However it works as expected when I open the database with ReadOnly == false