details:
For documentation, see comments in the file tx_pool.nim.
For prettified manual pages run 'make docs' in the nimbus directory and
point your web browser to the newly created 'docs' directory.
why:
Some helper file will not be generated by the nim document gereator,
so they have been stashed from a later nim version to be provided when
missing.
This problem was known with an earlier nim version (see here
https://github.com/nim-lang/Nim/issues/8952) but was reported solved.
Maybe we need a second look into that.
why:
Previously, the function 'snapshot_desc.loadSnapshot()' contained the
equivalent of 'eth.decode(@[],SnapshotData)' for some type 'SnapshotData'
which should result in an exception of type 'RlpTypeMismatch'.
Before mid October, this worked for all systems on the Github CI. Since
then, a segfault message in the Github CI can be reproduced on all 64bit
Windows wuns when running 'build/all_tests <id-of-test_txpool>' after the
failed 'make test' directive (the latter one needs to be extended by
'|| true'.) This error cannot be reproduced on my local Win7/64 system
with the same MSYS2 and gcc 11.2.0 compiler.
The fix is, rather than catching an exception, to explicitly check the
first argument of 'eth.decode(@[],SnapshotData)' and act if it is empty.
also:
removed some obsolete {.inline.} annotations.
why:
Previous version was based on lru_cache which is ugly. This module is
based on the stew/keyed_queue library module.
other:
There are still some other modules rely on lru_cache which should be
removed.
* Redesign of BaseVMState descriptor
why:
BaseVMState provides an environment for executing transactions. The
current descriptor also provides data that cannot generally be known
within the execution environment, e.g. the total gasUsed which is
available not before after all transactions have finished.
Also, the BaseVMState constructor has been replaced by a constructor
that does not need pre-initialised input of the account database.
also:
Previous constructor and some fields are provided with a deprecated
annotation (producing a lot of noise.)
* Replace legacy directives in production sources
* Replace legacy directives in unit test sources
* fix CI (missing premix update)
* Remove legacy directives
* chase CI problem
* rebased
* Re-introduce 'AccountsCache' constructor optimisation for 'BaseVmState' re-initialisation
why:
Constructing a new 'AccountsCache' descriptor can be avoided sometimes
when the current state root is properly positioned already. Such a
feature existed already as the update function 'initStateDB()' for the
'BaseChanDB' where the accounts cache was linked into this desctiptor.
The function 'initStateDB()' was removed and re-implemented into the
'BaseVmState' constructor without optimisation. The old version was of
restricted use as a wrong accounts cache state would unconditionally
throw an exception rather than conceptually ask for a remedy.
The optimised 'BaseVmState' re-initialisation has been implemented for
the 'persistBlocks()' function.
also:
moved some test helpers to 'test/replay' folder
* Remove unused & undocumented fields from Chain descriptor
why:
Reduces attack surface in general & improves reading the code.
details:
1. The check for cumulativeGasUsed + tx.gasLimit <= header.gasLimit
makes neither sense nor is it part of the Eip1559 specs. Nevertheless
a check tx.gasLimit <= header.gasLimit is added to satisfy some
unit test (see comments in validateTransaction() body.)
2. As a replacement check for the one removed in 1, a check for
cumulativeGasUsed + gasBurned <= header.gasLimit has been added
(see comments in processTransactionImpl() body.)
3. Prototypes for processTransaction() variants have been cleaned up and
commented.
why:
Detail 1. in particular produces an error for tightly packed blocks when
the last tx in the list has a generous gasLimit.
- Allow access to contentDB from portal wire protocol
- Use this to do the db.get in `handleFindContent` directly
- Use this to check the `contentKeys` list in `handleOffer`
* Change History content key to us SSZ Union and adjust tests
* Change slot to byteBE instead of LE
This is currently not specified in the Portal network
specifications, but we are using already BE for the actual content
key, so change it also here to remain consistent.
- Remove the `--evm` option on non-EVMC builds.
`when` around an option doesn't work with confutils; it fails to compile.
Workaround that by setting the `ignore` pragma on EVMC-specific options.
(Thanks @jangko for that new pragma). I prefer this to a solution which
moves the whole option's pragma elsewhere, especially if we add more options.
- Improve the help text, so that it shows the standard library extension on
each target platform (or none if on another platform).
- Undo b3f21bf4 "add missing evmc_enabled conditional compilation in
evmc_dynamic_loader". Move the conditional to `nimbus.nim`, and take more
care there to only use the loader function in EVMC builds.
It's ok to just not include this EVMC-only module (like some other EVMC
modules), rather than making the module itself a bit broken: Without this
change, it references a function that's not imported or linked to, and it
only links because there is no call sequence reaching that function.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
- Add portal network ping and findNodes JSON-RPC endpoints
- clean-up of some cli arguments
- Add protocol_interop.md document and adjust/fix other
documentation
* crash test scenario
details:
Example code for inspecting nested block chain and accounts cache
database transaction framework. There seems to be a pathological
case where the system crashes after a rollback (as appeared in the
tx-pool packer code.)
* simplified crash scenario
* Workable solution (as suggested by Andri)
details:
Avoiding db.rollback() (db.commit() is OK) while vmState.stateDB is
alive.
* Rename text_txcrash => test_accounts_cache
why:
Unit tests covers part of accounts_cache handling
* comment update
Currently bootstrap nodes for discv5 and for the Portal nodes
were provided through separate cli arguments. This is however
confusing and cumbersome as typically when (currently) testing
a node will have both discv5 and the Portal networks enabled.
We merge them into one argument.
If a node happens not to support a Portal network, it will be
removed after message request failure.
Commit also contains additional clean-up and nim-eth bump.
- `network` and `discovery` got additional longDesc,
the help text now become more descriptive.
- `networkId` and `networkParams` now is ignored by confutils
and become ordinary fields of NimbusConf.
This fixes#867 "EIP-170 related consensus error at Goerli block 5080941", and
equivalent on other networks.
This combines a change on the EVM-caller side with an EVM-side change from
@jangko 6548ff98 "fixes CREATE/CREATE2's `returndata` bug", making the caller
EVM ignore any data except from `REVERT`.
Either change works by itself. The reason for both is to ensure we definitely
comply with ambiguous EVMC expectations from either side of that boundary, and
it makes the internal API clearer.
As well as fixing a specific consensus issue, there are some other EVM logic
changes too: Refactored `writeContract`, how `RETURNDATA` is handled inside the
EVM, and changed behaviour with quirks before EIP-2 (Homestead).
The fix allows sync to pass block 5080941 on Goerli, and probably equivalent on
other networks. Here's a trace at batch 5080897..5081088:
```
TRC 2021-10-01 21:18:12.883+01:00 Persisting blocks file=persist_blocks.nim:43 fromBlock=5080897 toBlock=5081088
...
DBG 2021-10-01 21:18:13.270+01:00 Contract code size exceeds EIP170 topics="vm computation" file=computation.nim:236 limit=24577 actual=31411
DBG 2021-10-01 21:18:13.271+01:00 gasUsed neq cumulativeGasUsed file=process_block.nim:68 block=5080941/0A3537BC5BDFC637349E1C77D9648F2F65E2BF973ABF7956618F854B769DF626 gasUsed=3129669 cumulativeGasUsed=3132615
TRC 2021-10-01 21:18:13.271+01:00 peer disconnected file=blockchain_sync.nim:407 peer=<IP:PORT>
```
Although it says "Contract code size" and "gasUsed", this bug is more general
than either contract size or gas. It's due to incorrect behaviour of EVM
instructions `RETURNDATA` and `RETURNDATASIZE`.
Sometimes when `writeContract` decides to reject writing the contract for any
of several reasons (for example just insufficient gas), the unwritten contract
code was being used as the "return data", and given to the caller. If the
caller used `RETURNDATA` or `RETURNDATASIZE` ops, those incorrectly reported
the contract code that didn't get written.
EIP-211 (https://eips.ethereum.org/EIPS/eip-211) describes `RETURNDATA`:
> "`CREATE` and `CREATE2` are considered to return the empty buffer in the
> success case and the failure data in the failure case".
The language is ambiguous. In fact "failure case" means when the contract uses
`REVERT` to finish. It doesn't mean other failures like out of gas, EIP-170
limit, EIP-3541, etc.
To be thorough, and to ensure we always do the right thing with real EVMC when
that's finalised, this patch fixes the `RETURNDATA` issue in two places, either
of which make Goerli block 5080941 pass.
`writeContract` has been refactored to be caller, and so has where it's called.
It sets an error in the usual way if contract writing is rejected -- that's
anticipating EVMC, where we'll use different error codes later.
Overall four behaviour changes:
1. On the callee side, it doesn't set `c.outputData` except for `REVERT`.
2. On the caller side, it doesn't read `child.outputData` except for `REVERT`.
3. There was a bug in processing before Homestead fork (EIP-2). We did not
match the spec or other implementations; now we do. When there's
insufficient gas, before Homestead it's treated as success but with an empty
contract.
d117c8f3fd/ethereum/processblock.py (L304)https://github.com/ethereum/go-ethereum/blob/401354976bb4/core/vm/instructions.go#L586
4. The Byzantium check has been removed, as it's unnecessary.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
This patch adds:
- Load and use a third-party EVM in a shared library, instead of Nimbus EVM.
- New option `--evm` to specify which library to load.
- The library and this loader conforms to the [EVMC]
(https://evmc.ethereum.org/) 9.x specification.
Any third-party EVM which is compatible with EVMC version 9.x and supports EVM1
contract code will be accepted. The operating system's shared library format
applies. These are `.so*` files on Linux, `.dll` files on Windows and `.dylib`
files on Mac.
The alternative EVM can be selected in two ways:
- Nimbus command line option `--evm:<path>`.
- Environment variable `NIMBUS_EVM=<path>`.
The reason for an environment variable is this allows all the test programs to
run with a third-party EVM as well. Some don't parse command line options.
There are some limitations to be aware of:
- The third-party EVM must use EVMC version 9.x, no other major version.
EVMC 9.x supports EIP-1559 / London fork and older transactions.
- Nested `*CALL` and `CREATE*` operations don't use the third-party EVM yet.
These call the built-in Nimbus EVM. This mixing of different EVMs between
levels is explicitly allowed in specs, so there is no problem doing it.
- The third-party EVM doesn't need to support precompiles, because those are
nested calls, which use the built-in Nimbus EVM.
- Third-party EVMs execute contracts correctly, but fail the final `rootHash`
match. The reason is that some account state changes, which are correct, are
currently inside the Nimbus EVM and need to be moved to EVMC host logic.
*This is a known work in progress*. The EVM execution itself is fine.
Test results using "evmone" third-party EVM:
- [evmone](https://github.com/ethereum/evmone) has been tested. Only on
Linux but it "should" work on Windows and Mac equally well.
- [Version 0.8.1](https://github.com/ethereum/evmone/releases/tag/v0.8.1) was
used because it is compatible with EVMC 9.x, which is required for the
EIP-1559 / London fork, which Nimbus supports. Version 0.8.0 could be used
but it looks like an important bug was fixed in 0.8.1.
- evmone runs fine and the trace output looks good. The calls and arguments
are the same as the built-in Nimbus EVM for tests that have been checked
manually, except evmone skips some calls that can be safely skipped.
- The final `rootHash` is incorrect, due to the *work in progress* mentioned
above which is not part of the evmone execution. Due to this, it's possible
to try evmone and verify expected behaviours, which also validates our own
EVMC implementation, but it can't be used as a full substitute yet.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
This missing part of EVMC processing allows third-party EVMs to work.
It fixes EVMC result processing (at the top-level of calls, not nested calls)
to use the EVMC result object, instead of reading so much internal state of the
Nimbus `Computation` object.
It has been tested by calling [`evmone`](https://github.com/ethereum/evmone)
and getting useful results with tracing enabled (`showTxCalls = true`). It's
even able to run parts of the fixtures test suite.
There are other issues with account balances, etc that need to be worked on to
get the correct _final_ results, but the EVM execution is correct with this.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
Perform byte-endian conversion for 256-bit numeric values, but not 256-bit
hashes. These conversions are necessary for EVMC binary compatibility.
In new EVMC, all host-side conversions are explicit, calling `flip256`.
These conversions are performed in the EVMC "glue" code, which deals with the
binary interface, so the host services aren't aware of conversions.
We intend to skip these conversions when Nimbus host calls Nimbus EVM, even
when it's a shared library, using a negotiated EVMC extension. But for now
we're focused on correctness and cross-validation with third party EVMs.
The overhead of endian conversion is not too high because most EVMC host calls
access the database anyway. `getTxContext` does not, so the conversions from
that are cached here. Also, well-optimised EVMs don't call it often.
It is arguable whether endian conversion should occur for storage slots (`key`).
In favour of no conversion: Slot keys are 32-byte blobs, and this is clear in
the EVMC definition where slot keys are `evmc_bytes32` (not `evmc_uint256be`),
meaning treating as a number is _not_ expected by EVMC. Although they are
often small numbers, sometimes they are a hash from the contract code plus a
number. Slot keys are hashed on the host side with Keccak256 before any
database calls, so the host side does not look at them numerically.
In favour of conversion: They are often small numbers and it is helpful to log
them as such, rather than a long string of zero digits with 1-2 non-zero. The
representation in JSON has leading zeros removed, like a number rather than a
32-byte blob. There is also an interesting space optimisation when the keys
are used unhashed in storage.
Nimbus currently treats slot keys on the host side as numbers, and the tests
pass when endian conversion is done. So to remain consistent with other parts
of Nimbus we convert slot keys.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
Adds changes to Nimbus Hive support for the new
[Arrow Glacier fork](https://eips.ethereum.org/EIPS/eip-4345).
While here:
- Fix typo in `nimbus.sh`:
`HIVE_FORK_MUIRGLACIER` => `HIVE_FORK_MUIR_GLACIER` (just a comment).
- Add `muirGlacierBlock` to the JSON generated in `extract_consensus_data.nim`.
This makes it symmetric with the JSON parsed in `mapper.jq`.
- Removed "At5" network names which are not used by any of the test suite.
These are `ByzantiumToConstantinopleAt5`, `ConstantinopleFixToIstanbulAt5`
and `IstanbulToBerlinAt5`.
The motivation for removing these instead of systematically including all
possibilities was that I realised `LondonToArrowGlacierAt5` does not appear
anywhere in the current test suite, even though `ArrowGlacier` does. As each
section in the code is rather large already, I thought it cleaner to not add
this one, and keep only the ones the test suite actually uses.
This also now better matches the code in `test_blockchain_json.nim`.
- Sorted `HomesteadToDaoAt5` before `HomesteadToEIP150At5` because the DAO
fork happened earlier than EIP-150 in real life.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
Add the new [Arrow Glacier fork](https://eips.ethereum.org/EIPS/eip-4345).
Only the difficulty calculation is changed, but as a new fork it still affects
a number of places in the code.
To the best of my knowledge the change is only scheduled on Mainnet.
In addition:
- The fork date comments in `chain_config.nim` have been checked against the
real networks, set consistently in UTC instead of random timezones, and made
neater. Maybe we'll keep these when transferring config to a file someday.
- It's added to forkid hash tests (EIP-2124/EIP-2364), of course.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
* PoW wrapper for verification & mining
why:
It eases data management of per-Epoch lookup tables. Also some unit
tests show limits of usefulness on non-specialised machines for
mining besides developing tests.
details:
For PoW verification, this patch provides a pretty wrapper hiding the
details of the ethash/Hashimoto lookup cache management.
For mining on my development system without special hardware, the
underlying ethash functions are prohibitively slow. It takes
* ~20 minutes to prepare the full ethash/Hashimoto lookup dataset
* a second to run ~25k nonce tests (in the mining loop)
The mining part might be of some use for generating test data for
the tx-pool, though.
* Using PowRef as replacement for EpochHashCache + hashimotoLight()
* Fix typo (CI failed)
why:
was below log level when testing locally
* fix canonical naming
* Rename FindNode to FindNodes as per spec
* Use consistently lower case starting camelCase for consts
Style guide nep1 allows for both CamelCase and camelCase for
consts, but we seem to use more often camelCase. Using this now
consistently.
* Change some procs to func
* Add resolve call for Portal networks
And:
- Refactor some code by adding a findNodeVerified call
- add the portal network lookup json-rpc call that uses resolve
- add usage of this lookup in the portal testnet tests
- Additional comments
* Let recordsFromBytes fail on invalid ENRs
This behaviour is more similar as how it is done in discovery v5
base layer.
bugfix and features:
- Switch to the Chronos HTTP client (adds support for HTTPS)
- Allow dynamic RPC method names in the 'rpc' macro
- Restore the support for using the news package
- Add basic discv5 and portal json-rpc calls and activate them in
fluffy
- Renames in the rpc folder
- Add local testnet script and run this script in CI
- bump nim-eth
* Add SSZ Unions through case objects
* Add connection id content response test and improve other test vectors
* Implement content keys and ids for state network as per spec
Content keys case object is used so that it can be serialized and
deserialized as an SSZ Union.
* Let message Union in Portal wire protocol start at 0 as per new spec
- Search for the node on an incoming portal message and try to add
it to the routing table
- Don't rely on discv5 nodes for bootstrapping portal networks for
now.
- Attempt to repopulate the routing table when it is at 0 or drops
to 0.
Jordan Hrycaj
Kim De Mey
KonradStaniec
Jacek Sieka
Jamie Lokier
jangko