52-bit precision is not enough for our 256-bit VM, but this value
matches the reference implementation, see the
https://github.com/neo-project/neo/issues/2879.
MaxIntegerPrec will be increased (or even removed) as soon as the
ref. issue is resolved.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Ensure that Scopes can be properly parsed not only from the string
representation, but also from a single byte. transaction.Signer
is not affected (checked against the C# implementation), only
RPC-related signer scopes are allowed to be unmarshalled from byte.
Close#3059.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
This prevents the possible attack on notary request sender when
malicious partie is allowed to send notary request with main transaction
being someone else's fallback.
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>
Make the contracts cache initialization unified. The order of cache
iniitialization is not important and Nottary contract is added to the
bc.contracts.Contracts wrt P2PSigExtensions setting, thus no functional
changes, just refactoring for future applications.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
Initialize Prometheus metrics on node start where appropriate and review
the usage of the following metrics:
```
anna@kiwi:~/Documents/GitProjects/nspcc-dev/neo-go$ find | grep prometheus.go
./pkg/network/prometheus.go
./pkg/core/stateroot/prometheus.go
./pkg/core/prometheus.go
./pkg/services/rpcsrv/prometheus.go
./pkg/services/metrics/prometheus.go
```
Close#2970.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
The reader is about to exit and it will close legacy c.Notifications, but it
will leave subscription channels at the same time. This is wrong since these
channels will no longer receive any new events, game over.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
wsReader() closes c.done first and then goes over the list of
c.respChannels. Technically this means that any of the two can be taken in
this select.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
If `StartWhenSynchronized` is unset in config, `node` command runs RPC
service instantly. Previously there was a ground for deadlock. Command
started RPC server synchronously. According to server implementation, it
sends all internal failures to the parameterized error channel. Deadlock
occured because main routine didn't scan the channel.
Run `rpcsrv.Server.Start` in a separate go-routine in `startServer`.
This prevents potential deadlock caused by writing into unread channel.
Fixes#2896.
Signed-off-by: Leonard Lyubich <leonard@morphbits.io>
Previously RPC server shutdown procedure listened to the execution
channel and stopped at the first element that arrived in the queue. This
could lead to the following problems:
* stopper could steal the execution result from subscriber
* stopper didn't wait for other subscription actions to complete
Add dedicated channel to `Server` for subscription routine. Close the
channel on `handleSubEvents` return and wait for signal in `Shutdown`.
Signed-off-by: Leonard Lyubich <leonard@morphbits.io>
Previously RPC server could never be shut down completely due to
some start precondition failure (in particular, inability to serve HTTP
on any configured endpoint). The problem was caused by next facts:
* start method ran subscription routine after HTTP init succeeded only
* stop method blocked waiting for the subscription routine to return
Run `handleSubEvents` routine on fresh `Start` unconditionally. With
this change, `Shutdown` method won't produce deadlock since
`handleSubEvents` closes wait channel.
Refs #2896.
Signed-off-by: Leonard Lyubich <leonard@morphbits.io>
There is an existing problem with RPC server shutdown freeze after start
failure due to some init actions (at least HTTP listen) described in
#2896.
Add dedicated unit test which checks that `Shutdown` returns within 5s
after `Start` method encounters internal problems.
Signed-off-by: Leonard Lyubich <leonard@morphbits.io>
I've carefully checked the way how new service can be added to the
Blockchain instance or to be removed from it. Current implemention
of SetNotary and SetOracle methods doesn't contain dangerous code,
and native contracts have atomic values everywhere where service
is stored.
Current implementation of Notary, Oracle and StateRoot services'
reload/disabling/enabling on SIGUSR1 is safe and doesn't require
any adjustment.
This commit closes#2944, it's not a bug in the code, it's just
stale documentation.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
52-bit precision is not enough for our 256-bit VM, but this value
matches the reference implementation, see the
https://github.com/neo-project/neo/issues/2879.
MaxIntegerPrec will be increased (or even removed) as soon as the
ref. issue is resolved.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
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>
Witnesses are not yet created by the moment we return this error,
thus, it was always 0 as an actual number of witnesses in
ErrInvalidWitnessNum.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
`(*Blockchain).HasTransaction` is one of the oldest methods in our
codebase, and currently it's completely unused. I also doubt that
this method works as expected because it returns `true` if transaction
in the mempool.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
This prevents the possible attack on notary request sender when
malicious partie is allowed to send notary request with main transaction
being someone else's fallback.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
