Mostly it's about Go 1.22+ syntax with ranging over integers, but it also
prefers ranging over slices where possible (it makes code a little better to
read).
Notice that we have a number of dangerous loops where slices are mutated
during loop execution, many of these can't be converted since we need proper
length evalutation at every iteration.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
This test ensures that NeoGo node doesn't have the DeepCopy problem
described in https://github.com/neo-project/neo/issues/3300 and fixed in
https://github.com/neo-project/neo/pull/3301. This problem leads to the
fact that Notifications items are not being properly refcounted by C#
node which leads to possibility to build an enormously large object on
stack. Go node doesn't have this problem.
The reason (at least, as I understand it) is in the fact that C# node
performs objects refcounting inside the DeepCopy even if the object
itself is not yet on stack. I.e. System.Runtime.Notify handler
immediately adds references to the notification argumetns inside
DeepCopy:
b1d27f0189/src/Neo.VM/Types/Array.cs (L108)b1d27f0189/src/Neo.VM/Types/Array.cs (L75)
Whereas Go node just performs the honest DeepCopy without references counting:
b66cea5ccc/pkg/vm/stackitem/item.go (L1223)
Going further, C# node clears refs for notification arguments (for array
and underlying array items). System.Runtime.GetNotifications pushes the
notificaiton args array back on stack and increments counter only for
the external array, not for its arguments. Which results in negative
refcounter once notificaiton is removed from the stack. The fix itself
(f471c0542d/src/Neo/SmartContract/NotifyEventArgs.cs (L84))
doesn't need to be ported to NeoGo because Go node adds object to the
refcounter only at the moment when it's being pushed to stack by
System.Runtime.GetNotifications handler. This object is treated as new
object since it was deepcopied earlier by System.Runtime.Notify handler:
b66cea5ccc/pkg/vm/stack.go (L178).
Thus, no functoinal changes from the NeoGo side. And we won't
intentionally break our node to follow C# pre-Domovoi invalid behaviour.
Close#3484, close#3482.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Account is blocked when it's in the Policy's storage, not when it's
missing from the Policy storage. Introduced in
bbbc6805a8.
This bug leads to the fact that during native Neo cache initialization
at the last block in the dBFT epoch, all candidates accounts are
"blocked", and thus, stand-by committee and validators are used in the
subsequent new epoch. Close#3424.
This bug may lead to the consequences described in #3273, but it needs
to be confirmed.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Transaction
0x289c235dcdab8be7426d05f0fbb5e86c619f81481ea136493fa95deee5dbb7cc is
already on mainnet at block 5272006 and we can't do anything with it.
This transaction has genesis block hash in Conflicts attribute. It leads
to the following consequences:
1. Genesis block executable record is overwritten by conflict record
stub. Genesis block can't be retrieved anymore. This bug is described
in #3427.
2. Somehow this transaction has passed verification on NeoGo CN without
any warnings:
```
Apr 24 16:12:30 kangra neo-go[2453907]: 2024-04-24T16:12:30.865+0300 INFO initializing dbft {"height": 5272006, "view": 0, "index": 6, "role": "Backup"}
Apr 24 16:12:31 kangra neo-go[2453907]: 2024-04-24T16:12:31.245+0300 INFO persisted to disk {"blocks": 1, "keys": 37, "headerHeight": 5272005, "blockHeight": 5272005, "took": "14.548903ms"}
Apr 24 16:12:34 kangra neo-go[2453907]: 2024-04-24T16:12:34.977+0300 ERROR can't add SV-signed state root {"error": "stateroot mismatch at block 5272005: 9d5f95784f26c862d6f889f213aad1e3330611880c02330e88db8802c750aa46 vs d25304d518645df725014897d13bbf023919928e79074abcea48f31cf9f32a25"}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.820+0300 INFO received PrepareRequest {"validator": 5, "tx": 1}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.821+0300 INFO sending PrepareResponse {"height": 5272006, "view": 0}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.827+0300 INFO received PrepareResponse {"validator": 4}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.830+0300 INFO received PrepareResponse {"validator": 3}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.875+0300 INFO received PrepareResponse {"validator": 2}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.878+0300 INFO sending Commit {"height": 5272006, "view": 0}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.879+0300 INFO received Commit {"validator": 4}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.881+0300 INFO received PrepareResponse {"validator": 0}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.881+0300 INFO received Commit {"validator": 3}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.906+0300 INFO received Commit {"validator": 0}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.907+0300 INFO received PrepareResponse {"validator": 1}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.915+0300 INFO received Commit {"validator": 1}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.915+0300 INFO approving block {"height": 5272006, "hash": "6b111519537343ce579d04ccad71c43318b12c680d0f374dfcd466aa22643fb6", "tx_count": 1, "merkle": "ccb7dbe5ee5da93f4936a11e48819f616ce8b5fbf0056d42e78babcd5d239c28", "prev": "12ad6cc5d0cd357b9fc9fb0c1a016ba8014d3cdd5a96818598e6a40a1a4a2a21"}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.917+0300 WARN contract invocation failed {"tx": "289c235dcdab8be7426d05f0fbb5e86c619f81481ea136493fa95deee5dbb7cc", "block": 5272006, "error": "at instruction 86 (ASSERT): ASSERT failed"}
Apr 24 16:12:45 kangra neo-go[2453907]: 2024-04-24T16:12:45.950+0300 INFO initializing dbft {"height": 5272007, "view": 0, "index": 6, "role": "Primary"}
Apr 24 16:12:46 kangra neo-go[2453907]: 2024-04-24T16:12:46.256+0300 INFO persisted to disk {"blocks": 1, "keys": 67, "headerHeight": 5272006, "blockHeight": 5272006, "took": "16.576594ms"}
```
And thus, we must treat this transaction as valid for this behaviour
to be reproducable.
This commit contains two fixes:
1. Do not overwrite block executable records by conflict record stubs.
If some transaction conflicts with block, then just skip the conflict
record stub for this attribute since it's impossible to create
transaction with the same hash.
2. Do not fail verification for those transactions that have Conflicts
attribute with block hash inside. This one is controversial, but we
have to adjust this code to treat already accepted transaction as
valid.
Close#3427.
The transaction itself:
```
{
"id" : 1,
"jsonrpc" : "2.0",
"result" : {
"attributes" : [
{
"height" : 0,
"type" : "NotValidBefore"
},
{
"hash" : "0x1f4d1defa46faa5e7b9b8d3f79a06bec777d7c26c4aa5f6f5899a291daa87c15",
"type" : "Conflicts"
}
],
"blockhash" : "0xb63f6422aa66d4fc4d370f0d682cb11833c471adcc049d57ce4373531915116b",
"blocktime" : 1713964365700,
"confirmations" : 108335,
"hash" : "0x289c235dcdab8be7426d05f0fbb5e86c619f81481ea136493fa95deee5dbb7cc",
"netfee" : "237904",
"nonce" : 0,
"script" : "CxAMFIPvkoyXujYCRmgq9qEfMJQ4wNveDBSD75KMl7o2AkZoKvahHzCUOMDb3hTAHwwIdHJhbnNmZXIMFPVj6kC8KD1NDgXEjqMFs/Kgc0DvQWJ9W1I5",
"sender" : "NbcGB1tBEGM5MfhNbDAimvpJKzvVjLQ3jW",
"signers" : [
{
"account" : "0x649ca095e38a790d6c15ff78e0c6175099b428ac",
"scopes" : "None"
},
{
"account" : "0xdedbc03894301fa1f62a68460236ba978c92ef83",
"scopes" : "None"
}
],
"size" : 412,
"sysfee" : "997778",
"validuntilblock" : 5277629,
"version" : 0,
"vmstate" : "FAULT",
"witnesses" : [
{
"invocation" : "DECw8XNuyRg5vPeHxisQXlZ7VYNDxxK4xEm8zwpPyWJSSu+JaRKQxdrlPkXxXj34wc4ZSrZvKICGgPFE0ZHXhLPo",
"verification" : "DCEC+PI2tRSlp0wGwnjRuQdWdI0tBXNS7SlzSBBHFsaKUsdBVuezJw=="
},
{
"invocation" : "DEAxwi97t+rg9RsccOUzdJTJK7idbR7uUqQp0/0/ob9FbuW/tFius3/FOi82PDZtwdhk7s7KiNM/pU7vZLsgIbM0",
"verification" : "DCEDbInkzF5llzmgljE4HSMvtrNgPaz73XO5wgVJXLHNLXRBVuezJw=="
}
]
}
}
```
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Refactored native NeoToken cache scheme introduced in #3110 sometimes requires
validators list recalculation during native cache initialization process (when
initializing with the existing storage from the block that is preceded each N-th block).
To recalculate validators from candidates, native NeoToken needs an access to
cached native Policy blocked accounts. By the moment of native Neo initialization,
the cache of native Policy is not yet initialized, thus we need a direct DAO access
for Policy to handle blocked account check.
Close#3181.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
No functional changes, just a refactoring.
Use more specific and meaningful names to be able to use these errors from external packages.
Signed-off-by: Tatiana Nesterenko <tatiana@nspcc.io>
During new transaction verification if there's an on-chain conflicting
transaction, we should check the signers of this conflicting transaction.
If the signers intersect with signers of the incoming transaction, then
the conflict is treated as valid and verification for new incoming
transaction should fail. Otherwise, the conflict is treated as the
malicious attack attempt and will not be taken into account;
verification for the new incoming transaction should continue.
This commint implements the scheme described at
https://github.com/neo-project/neo/pull/2818#issuecomment-1632972055,
thanks to @shargon for digging.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
If the contract was deployed then cache must be initialized after
in-memory data reset. If the contract isn't active yet, then no
cache will be initialized on deploy (i.e. on call to Initialize()
method by native Management).
Close#2984.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Move them to the core/network packages, close#2950. The name of
mempool's unsorted transactions metrics has been changed along the
way to match the core's metrics naming convention.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Everywhere including examples, external interop APIs, bindings generators
code and in other valuable places. A couple of `interface{}` usages are
intentionally left in the CHANGELOG.md, documentation and tests.
It directly affects node security and the default here MUST BE the safe choice
which is to do the verification. Otherwise it's just dangerous, absent any
VerifyBlocks configuration we'll get an insecure node. This option is not
supposed to be frequently used and it doesn't affect the ability to process
blocks, so breaking compatibility (in a safe manner) should be OK here.
And include some node-specific configurations there with backwards
compatibility. Note that in the future we'll remove Ledger's
fields from the ProtocolConfiguration and it'll be possible to access them in
Blockchain directly (not via .Ledger).
The other option tried was using two configuration types separately, but that
incurs more changes to the codebase, single structure that behaves almost like
the old one is better for backwards compatibility.
Fixes#2676.
They can stay in the memory pool forever because consensus process will never
accept these transactions (and maybe even block consensus process at all).
We're paging these hashes, so we need a previous full page and a current one
plus some cache for various requests. Storing 1M of hashes is 32M of memory
and it grows quickly. It also seriously affects node startup time, most of
what it's doing is reading these hashes, the longer the chain the more time it
needs to do that.
Notice that this doesn't change the underlying DB scheme in any way.
Bad contract -> no contract. Unfortunately we've got a broken
6f1837723768f27a6f6a14452977e3e0e264f2cc contract on the mainnet which can't
be decoded (even though it had been saved successfully), so this is a
temporary fix for #2801 to be able to start mainnet node after shutdown.
1. It's not good for pkg/core to import anything from pkg/neorpc.
2. The type is closely tied to the state package, even though it's not stored
in the DB
