def get(self, key):
validate_is_bytes(key)
trie_key = bytes_to_nibbles(key)
root_hash = self.root_hash
try:
return self._get(root_hash, trie_key)
except MissingTraversalNode as traverse_exc:
raise MissingTrieNode(
traverse_exc.missing_node_hash,
root_hash,
key,
traverse_exc.nibbles_traversed,
) from traverse_exc
def _raise_missing_node(self, exception, key):
# Indicate more information about which key was requested, which node was missing, etc
raise MissingTrieNode(exception.args[0], self.root_hash,
key) from exception
def test_invalid_MissingTrieNode_prefix(invalid_prefix, exception):
with pytest.raises(exception):
MissingTrieNode(b'', b'', b'', invalid_prefix)
def test_valid_MissingTrieNode_prefix(valid_prefix):
exception = MissingTrieNode(b'', b'', b'', valid_prefix)
assert exception.prefix == valid_prefix
if valid_prefix is not None:
assert str(Nibbles(valid_prefix)) in repr(exception)