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unwrap: provide ErrNoSessionID, add some explanations

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This commit is contained in:
Roman Khimov 2022-09-06 16:05:57 +03:00
parent 457f904b1b
commit aca8ce0d28
1 changed files with 11 additions and 2 deletions
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13
pkg/rpcclient/unwrap/unwrap.go
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@ -25,6 +25,12 @@ import (
"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
)
// ErrNoSessionID is returned from the SessionIterator when the server does not
// have sessions enabled and does not perform automatic iterator expansion. It
// means you have no way to get the data from returned iterators using this
// server, other than expanding it in the VM script.
var ErrNoSessionID = errors.New("server returned iterator ID, but no session ID")
// BigInt expects correct execution (HALT state) with a single stack item
// returned. A big.Int is extracted from this item and returned.
func BigInt(r *result.Invoke, err error) (*big.Int, error) {
@ -142,7 +148,10 @@ func Uint256(r *result.Invoke, err error) (util.Uint256, error) {
// SessionIterator expects correct execution (HALT state) with a single stack
// item returned. If this item is an iterator it's returned to the caller along
// with the session ID.
// with the session ID. Notice that this function also returns successfully
// with zero session ID (but an appropriate Iterator holding all the data
// received) when RPC server performs (limited) iterator expansion which is the
// default behavior for NeoGo servers with SessionEnabled set to false.
func SessionIterator(r *result.Invoke, err error) (uuid.UUID, result.Iterator, error) {
itm, err := Item(r, err)
if err != nil {
@ -156,7 +165,7 @@ func SessionIterator(r *result.Invoke, err error) (uuid.UUID, result.Iterator, e
return uuid.UUID{}, result.Iterator{}, errors.New("the item is InteropInterface, but not an Iterator")
}
if (r.Session == uuid.UUID{}) && iter.ID != nil {
return uuid.UUID{}, result.Iterator{}, errors.New("server returned iterator ID, but no session ID")
return uuid.UUID{}, result.Iterator{}, ErrNoSessionID
}
return r.Session, iter, nil
}