Resulting item can't have more than MaxStackSize elements. Technically this
limits to MaxStackSize cloned elements but it's considered to be enough to
mitigate the issue (the next size check is going to happen during push to the
stack). See neo-project/neo#2534, thanks @vang1ong7ang.
We already do this in binary opcodes, let's be consistent.
This fixes state difference at height 275663
for tx 3c498317684d63849b03e4c58ad57ce4b19bb206b7b01bcc64233de3b3e207f4
Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
Standard binary serialization/deserialization is mostly used in VM to put/get
elements into/from storage, so they never should exceed MaxSize (otherwise one
won't be able to deserialize these items).
This patch leaves EncodeBinaryStackItem unprotected, but that's a streaming
interface, so it's up to the user of it to ensure its appropriate use (and our
uses are mostly for native contract's data, so they're fine).
We can have very deep reference types and attempt to JSONize them can easily
lead to OOM (even though there are no recursive references inside). Therefore
we have to limit them. While regular ToJSON() is buffer size limited to
MaxSize, ToJSONWithTypes is not and limiting it to MaxSize output will require
substantial rewriting effort while not really providing fair result, MaxSize
is more about stack item size while its JSON representation can be much bigger
because of various overheads.
Initial thought was to limit it by element count based on
MaxIteratorResultItems, but the problem here is that we don't always have this
limit in contexts using ToJSONWithTypes (like notification event
marshaling). Thus we need some generic limit which would be fine for all
users.
We at the same time have maxJSONDepth used when deserializing from JSON, so
it can be used for marshaling as well, it's not often that we have deeper
structures in real results.
Inspired by neo-project/neo#2521.
If we're done with element it no longer can lead to recursion error, so fix
cases like `[arr, arr]` where we have two copies of `arr` trigger this error
for no good reason (there is no recursion there).
This commit fixes the following Go vs C# state diff:
block 74613: value mismatch for key EwAAAHN0cmVhbXMvDg==: eyJpZCI6MTQsInN0YXJ0IjoxNjIyNTAwMjAwMDAwLCJzdG9wIjoxNjIyNTAyMDAwMDAwLCJkZXBvc2l0IjoxMDAwMDAwMDAsInJlbWFpbmluZyI6MTAwMDAwMDAwLCJzZW5kZXIiOiJmeEY4RDl2ZFU3K0gwcDV3NTlyWllMNytNSlE9IiwicmVjaXBpZW50IjoiSVV6c3pveFV0S1NGVnlZRGczSmdTQTFlbTFNPSJ9 vs eyJpZCI6MTQsInN0YXJ0IjoxNjIyNTAwMjAwMDAwLCJzdG9wIjoxNjIyNTAyMDAwMDAwLCJkZXBvc2l0IjoxMDAwMDAwMDAsInJlbWFpbmluZyI6MTAwMDAwMDAwLCJzZW5kZXIiOiJmeEY4RDl2ZFU3XHUwMDJCSDBwNXc1OXJaWUw3XHUwMDJCTUpRPSIsInJlY2lwaWVudCI6IklVenN6b3hVdEtTRlZ5WURnM0pnU0ExZW0xTT0ifQ==
I.e.:
```
{"id":14,"start":1622500200000,"stop":1622502000000,"deposit":100000000,"remaining":100000000,"sender":"fxF8D9vdU7+H0p5w59rZYL7+MJQ=","recipient":"IUzszoxUtKSFVyYDg3JgSA1em1M="}
```
vs
```
{"id":14,"start":1622500200000,"stop":1622502000000,"deposit":100000000,"remaining":100000000,"sender":"fxF8D9vdU7\u002BH0p5w59rZYL7\u002BMJQ=","recipient":"IUzszoxUtKSFVyYDg3JgSA1em1M="}
```
The result is the same HALT state, but the exception message is the real
one got from user. Changes ported from C#:
1. Throw exception: 59b8ac73d2/src/neo-vm/ExecutionEngine.cs (L1448)
2. Prettify message: https://github.com/neo-project/neo-vm/blob/master/src/neo-vm/VMUnhandledException.cs#L28
The result is that instead of
```
2021-03-31T17:02:54.508+0300 WARN contract invocation failed {"tx": "2aefeb705f3a609df8767d9b45e036b9dd1eb77407e5732375981915668889b8", "block": 30640, "error": "error encountered at instruction 970 (THROW): runtime error: invalid memory address or nil pointer dereference"}
```
we'll get
```
2021-03-31T17:33:56.299+0300 WARN contract invocation failed {"tx": "2aefeb705f3a609df8767d9b45e036b9dd1eb77407e5732375981915668889b8", "block": 30640, "error": "error encountered at instruction 970 (THROW): unhandled exception: No authorization."}
```
in the node logs.
