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stackitem: rework error handling

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Return good named errors everywhere, export appropriate constants, make
errors.Is() work.
This commit is contained in:
Roman Khimov 2021-07-07 00:18:00 +03:00
parent 0de949b575
commit 5a9efcc654
5 changed files with 108 additions and 67 deletions
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18
pkg/vm/stackitem/serialization.go
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@ -9,6 +9,14 @@ import (
"github.com/nspcc-dev/neo-go/pkg/io"
)
// ErrRecursive is returned on attempts to serialize some recursive stack item
// (like array including an item with reference to the same array).
var ErrRecursive = errors.New("recursive item")
// ErrUnserializable is returned on attempt to serialize some item that can't
// be serialized (like Interop item or Pointer).
var ErrUnserializable = errors.New("unserializable")
// serContext is an internal serialization context.
type serContext struct {
*io.BinWriter
@ -71,7 +79,7 @@ func (w *serContext) serialize(item Item) {
return
}
if w.seen[item] {
w.Err = errors.New("recursive structures can't be serialized")
w.Err = ErrRecursive
return
}
@ -92,7 +100,7 @@ func (w *serContext) serialize(item Item) {
if w.allowInvalid {
w.WriteBytes([]byte{byte(InteropT)})
} else {
w.Err = errors.New("interop item can't be serialized")
w.Err = fmt.Errorf("%w: Interop", ErrUnserializable)
}
case *Array, *Struct:
w.seen[item] = true
@ -126,12 +134,12 @@ func (w *serContext) serialize(item Item) {
if w.allowInvalid {
w.WriteBytes([]byte{byte(InvalidT)})
} else {
w.Err = errors.New("invalid stack item")
w.Err = fmt.Errorf("%w: nil", ErrUnserializable)
}
}
if w.Err == nil && w.buf != nil && w.buf.Len() > MaxSize {
w.Err = errors.New("too big item")
w.Err = errTooBigSize
}
}
@ -213,7 +221,7 @@ func decodeBinary(r *io.BinReader, allowInvalid bool) Item {
if t == InvalidT && allowInvalid {
return nil
}
r.Err = fmt.Errorf("unknown type: %v", t)
r.Err = fmt.Errorf("%w: %v", ErrInvalidType, t)
return nil
}
}