This PR unifies the error handling in miner.
Whenever an error occur while applying a transaction, the transaction should be regarded as invalid and all following transactions from the same sender not executable because of the nonce restriction. The only exception is the `nonceTooLow` error which is handled separately.
This change fixes a flaw where, in certain scenarios, the block sealer did not accurately reset the remaining gas after failing to include an invalid transaction. Fixes#26791
This PR is a (superior) alternative to https://github.com/ethereum/go-ethereum/pull/26708, it handles deprecation, primarily two specific cases.
`rand.Seed` is typically used in two ways
- `rand.Seed(time.Now().UnixNano())` -- we seed it, just to be sure to get some random, and not always get the same thing on every run. This is not needed, with global seeding, so those are just removed.
- `rand.Seed(1)` this is typically done to ensure we have a stable test. If we rely on this, we need to fix up the tests to use a deterministic prng-source. A few occurrences like this has been replaced with a proper custom source.
`rand.Read` has been replaced by `crypto/rand`.`Read` in this PR.
According to the spec the payloadID needs to be random or dependent on all arguments, to prevent two payloads from clashing. This change adds withdrawals into the payload derivation.
---------
Co-authored-by: lightclient@protonmail.com <lightclient@protonmail.com>
Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Felix Lange <fjl@twurst.com>
This PR moves core/beacon to beacon/engine so that beacon-chain related code has its own top level package which also can house the the beacon lightclient-code.
This change implements withdrawals as specified in EIP-4895.
Co-authored-by: lightclient@protonmail.com <lightclient@protonmail.com>
Co-authored-by: marioevz <marioevz@gmail.com>
Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Felix Lange <fjl@twurst.com>
This change introduces a breaking change to miner.etherbase is configured.
Previously, users did not need to explicitly set the etherbase address via flag, since 'first' local account was used as etherbase automatically. This change removes the "default first account" feature.
In Proof-of-stake world, the fee recipient address is provided by CL, and not configured in Geth any more - meaning that miner.etherbase is mostly for legacy networks(pow, clique networks etc).
This PR introduces a node scheme abstraction. The interface is only implemented by `hashScheme` at the moment, but will be extended by `pathScheme` very soon.
Apart from that, a few changes are also included which is worth mentioning:
- port the changes in the stacktrie, tracking the path prefix of nodes during commit
- use ethdb.Database for constructing trie.Database. This is not necessary right now, but it is required for path-based used to open reverse diff freezer
1.remove the unnecessary NewTxsEvent subscriber, which was used for PoW resubmit check.
2.unsubscribe ASAP before another fillTransactions, to avoid block others.
* worker: add double sign check for safety.
And for corner cases, such as reorg after reorg...
use slice to record all broadcast blocks's parents to avoid overwritten.
When new block is imported, there is no need to commit the current
work, even the new imported block is offturn and itself is inturn.
That is because when offturn block is received, the inturn block is
already later to broadcast block, deliver the later block will cause
many reorg, which is not reasonable.
And also make sure all useless work can be discarded, to avoid goroutine leak.
It may not efficient if schedule fillTransactions when new transactions arrive.
It could make the CPU keep running.
To make is more efficient:
1.schedule fillTransactions when a certain amount of transaction are arrived.
2.or there is not much time left.
Currently, validator only try once to get transactions from TxPool to produce the block.
However, new transactions could arrive while the validator is committing transaction.
Validator should be allowed to add these new arrived transactions as long as
Header.Timestamp is not reached
This commit will:
** commitTransactions return with error code
** drop current mining block on new block imported
** try fillTransactions several times for the best
not use append mode to follow the GasPrice rule.
** check if there is enough time for another fillTransactions.
`fillTransactions` will call `commitTransactions` twice, if the delay
timer is expired during the first call, it will make the delay timer
never be triggered in the second commitTransactions call.
Pseudo code:
x := time.NewTimer(time.Second)
<-x.C
fmt.Println("read delay 1")
<-x.C
fmt.Println("read delay 2") // will never hit
pre-seal empty block is for PoW to deliver an empty block ASAP to
gain the block mine reward.
It is useless for PoS consensus and it does not work for BSC either.
Delete the code to make worker simpler.
It could be a very old PoW logic, which try to add more transaction
into the pending block when mining is stopped.
Mining can be stopped when:
1.download started.
2.manually stopped by RPC.
It is unnecessary to add more transaction into the pending block if a validator is stopped.
And updateSnapshot() is not needed as well, it is to get the pending mining snapshot.
Right now, DelayLeftOver is used to reserve time for block finalize, not block
broadcast. And the code does not work as expected.
The general block generation could be described as:
|- fillTransactions -|- finalize a block -|- wait until the period(3s) reached -|- broadcast -|
resubmit intervalAdjust is for PoW only, to remove it to make worker simpler.
With PoW, there will be a periodic timer to check if it is the time to stop
packing transaction and start calculating the desired hash value, since other miner
could succeed in hash compute if it spends too much time packing transactions.
It will commit the current fruit to calculate root at a reasonable time.
And it will schedule a new work to get a big block if new transaction was received.
When there are too many transactions in the TxPool, the interval of the resubmit timer would be
increased and vice versa.
But it is not needed with PoS related consensus, since the block interval is determined in PoS,
and there is already a timer to stop too long packing.
This PR now also includes a fix to the problem of mult-routines building blocks on the same input. This PR works as before with regards to stopping the work, but it just will not spin up a second routine if one is already building. So if the CL does N calls to FCU+buildblock, and N calls to GetPayload, only the first of each will do something, the other calls will be mostly no-ops.
This PR also adds printout of the payload id into the logs.
This PR changes geth to read the eip1559 params from the chain config instead of the globals.
This way the parameters may be changed by forking the chain config code, without creating a large diff throughout the past and future usages of the parameters.
Co-authored-by: Martin Holst Swende <martin@swende.se>
* feature: do trie prefetch on state prefetch
Currently, state prefetch just pre execute the transactions and discard the results.
It is helpful to increase the snapshot cache hit rate.
It would be more helpful, if it can do trie prefetch at the same time, since the it will
preload the trie node and build the trie tree in advance.
This patch is to implement it, by reusing the main trie prefetch and doing finalize after
transaction is executed.
* some code improvements for trie prefetch
** increase pendingSize before dispatch tasks
** use throwaway StateDB for TriePrefetchInAdvance and remove the prefetcherLock
** remove the necessary drain operation in trie prefetch mainloop,
trie prefetcher won't be used after close.
This enables the following linters
- typecheck
- unused
- staticcheck
- bidichk
- durationcheck
- exportloopref
- gosec
WIth a few exceptions.
- We use a deprecated protobuf in trezor. I didn't want to mess with that, since I cannot meaningfully test any changes there.
- The deprecated TypeMux is used in a few places still, so the warning for it is silenced for now.
- Using string type in context.WithValue is apparently wrong, one should use a custom type, to prevent collisions between different places in the hierarchy of callers. That should be fixed at some point, but may require some attention.
- The warnings for using weak random generator are squashed, since we use a lot of random without need for cryptographic guarantees.
* eth/catalyst: build the execution payload async
* miner: added comment, added test case
* eth/catalyst: miner: move async block production to miner
* eth/catalyst, miner: support generate seal block async
* miner: rework GetSealingBlockAsync to use a passed channel
* miner: apply rjl's diff
* eth/catalyst: nitpicks
Co-authored-by: Gary Rong <garyrong0905@gmail.com>
During mining, when a new head arrives and interrupts the block building, the block being built should not be commited (but discarded). Committing the interrupted block introduces unnecessary delay, and possibly causes miner to mine on the previous head, which could result in higher uncle rate.
* core/beacon: eth/catalyst: updated engine api to new version
* core: implement exchangeTransitionConfig
* core/beacon: prevRandao instead of Random
* eth/catalyst: Fix ExchangeTransitionConfig, add test
* eth/catalyst: stop external miners on TTD reached
* node: implement --authrpc.vhosts flag
* core: allow for config override on non-mainnet networks
* eth/catalyst: fix peters comments
* eth/catalyst: make stop remote sealer more explicit
* eth/catalyst: add log output
* cmd/utils: rename authrpc.host to authrpc.addr
* eth/catalyst: disable the disabling of the miner
* eth: core: remove notion of terminal pow block
* eth: les: more of peters nitpicks
* eth, miner: remove duplicated code
* eth/catalyst: remove unneeded code
* miner: keep update pending state even the Merge is happened
* eth, miner: rebase
* miner: fix tests
* eth, miner: address comments from marius
* miner: use empty zero randomness for pending blocks after the merge
* eth/catalyst: gofmt
* miner: add warning log for state recovery
* miner: ignore uncles for post-merge blocks
Co-authored-by: Péter Szilágyi <peterke@gmail.com>
* all: work for eth1/2 transtition
* consensus/beacon, eth: change beacon difficulty to 0
* eth: updates
* all: add terminalBlockDifficulty config, fix rebasing issues
* eth: implemented merge interop spec
* internal/ethapi: update to v1.0.0.alpha.2
This commit updates the code to the new spec, moving payloadId into
it's own object. It also fixes an issue with finalizing an empty blockhash.
It also properly sets the basefee
* all: sync polishes, other fixes + refactors
* core, eth: correct semantics for LeavePoW, EnterPoS
* core: fixed rebasing artifacts
* core: light: performance improvements
* core: use keyed field (f)
* core: eth: fix compilation issues + tests
* eth/catalyst: dbetter error codes
* all: move Merger to consensus/, remove reliance on it in bc
* all: renamed EnterPoS and LeavePoW to ReachTDD and FinalizePoS
* core: make mergelogs a function
* core: use InsertChain instead of InsertBlock
* les: drop merger from lightchain object
* consensus: add merger
* core: recoverAncestors in catalyst mode
* core: fix nitpick
* all: removed merger from beacon, use TTD, nitpicks
* consensus: eth: add docstring, removed unnecessary code duplication
* consensus/beacon: better comment
* all: easy to fix nitpicks by karalabe
* consensus/beacon: verify known headers to be sure
* core: comments
* core: eth: don't drop peers who advertise blocks, nitpicks
* core: never add beacon blocks to the future queue
* core: fixed nitpicks
* consensus/beacon: simplify IsTTDReached check
* consensus/beacon: correct IsTTDReached check
Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>
* cmd, core: add flag --dev.gaslimit to allow configuring initial block gas limit in dev mode
* core: use provided gaslimit
Co-authored-by: Martin Holst Swende <martin@swende.se>
This PR fixes a problem which arises on clique networks when there is a network stall. Previously, the worker packages were tracked, even if the sealing engine decided not to seal the block (due to clique rules about recent signing). These tracked-but-not-sealed blocks kept building up in memory.
This PR changes the situation so the sealing engine instead returns an error, and the worker can thus un-track the package.
node.Node no longer registers any account manager backends by default,
they need to be registered explicitly.
For ethash-based tests, we actually don't need any accounts in the miner
keystore. Just set the etherbase instead to make mining work. For
clique, the signer account must be in the keystore.
The change also adds interrupt handling in stress tests.
This fixes a data race on worker.current by moving the call to StopPrefetcher
into the main loop.
The commit also contains fixes for two other races in unit tests of unrelated packages.
* accounts/abi/bind: fix bounded contracts and sim backend for 1559
* accounts/abi/bind, ethclient: don't rely on chain config for gas prices
* all: enable London for all internal tests
* les: get receipt type info in les tests
* les: fix weird test
Co-authored-by: Martin Holst Swende <martin@swende.se>
* core/types, miner: create TxWithMinerFee wrapper, add EIP-1559 support to TransactionsByMinerFeeAndNonce
miner: set base fee when creating a new header, handle gas limit, log miner fees
* all: rename to NewTransactionsByPriceAndNonce
* core/types, miner: rename to NewTransactionsByPriceAndNonce + EffectiveTip
miner: activate 1559 for testGenerateBlockAndImport tests
* core,miner: revert naming to TransactionsByPriceAndTime
* core/types/transaction: update effective tip calculation logic
* miner: update aleut to london
* core/types/transaction_test: use correct signer for 1559 txs + add back sender check
* miner/worker: calculate gas target from gas limit
* core, miner: fix block gas limits for 1559
Co-authored-by: Ansgar Dietrichs <adietrichs@gmail.com>
Co-authored-by: lightclient@protonmail.com <lightclient@protonmail.com>
The PR implements the --miner.notify.full flag that enables full pending block
notifications. When this flag is used, the block notifications sent to mining
endpoints contain the complete block header JSON instead of a work package
array.
Co-authored-by: AlexSSD7 <alexandersadovskyi7@protonmail.com>
Co-authored-by: Martin Holst Swende <martin@swende.se>
This adds support for EIP-2718 typed transactions as well as EIP-2930
access list transactions (tx type 1). These EIPs are scheduled for the
Berlin fork.
There very few changes to existing APIs in core/types, and several new APIs
to deal with access list transactions. In particular, there are two new
constructor functions for transactions: types.NewTx and types.SignNewTx.
Since the canonical encoding of typed transactions is not RLP-compatible,
Transaction now has new methods for encoding and decoding: MarshalBinary
and UnmarshalBinary.
The existing EIP-155 signer does not support the new transaction types.
All code dealing with transaction signatures should be updated to use the
newer EIP-2930 signer. To make this easier for future updates, we have
added new constructor functions for types.Signer: types.LatestSigner and
types.LatestSignerForChainID.
This change also adds support for the YoloV3 testnet.
Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Felix Lange <fjl@twurst.com>
Co-authored-by: Ryan Schneider <ryanleeschneider@gmail.com>
This moves the eth config definition into a separate package, eth/ethconfig.
Packages eth and les can now import this common package instead of
importing eth from les, reducing dependencies.
Co-authored-by: Felix Lange <fjl@twurst.com>
The PR makes use of the stacktrie, which is is more lenient on resource consumption, than the regular trie, in cases where we only need it for DeriveSha
USB enumeration still occured. Make sure it will only occur if --usb is set.
This also deprecates the 'NoUSB' config file option in favor of a new option 'USB'.
This PR removes a logic in the miner, which was originally intended to help temporary testnets based on ethash from "running off into the future". If the difficulty was low, and a few computers started mining several blocks per second, the ethash rules (which demand 1s delay between blocks) would push the blocktimes further and further away.
The solution was to make the miner sleep while this happened.
Nowadays, this problem is solved instead by PoA chains, and it's recommended to let testnets and devnets be based on clique instead. The existing logic is problematic, since it can cause stalls within the miner making it difficult for remote workers to submit work if the channel is blocked on a sleep.
Credits to Saar Tochner for reporting this via the bug bounty
In miner/worker.go, there are two goroutine using channel w.newWorkCh: newWorkerLoop() sends to this channel, and mainLoop() receives from this channel. Only the receive operation is in a select.
However, w.exitCh may be closed by another goroutine. This is fine for the receive since receive is in select, but if the send operation is blocking, then it will block forever. This commit puts the send in a select, so it won't block even if w.exitCh is closed.
Similarly, there are two goroutines using channel errc: the parent that runs the test receives from it, and the child created at line 573 sends to it. If the parent goroutine exits too early by calling t.Fatalf() at line 614, then the child goroutine will be blocked at line 574 forever. This commit adds 1 buffer to errc. Now send will not block, and receive is not influenced because receive still needs to wait for the send.
A lot of times when we hit 'core' errors, example: invalid tx, the information provided is
insufficient. We miss several pieces of information: what account has nonce too high,
and what transaction in that block was offending?
This PR adds that information, using the new type of wrapped errors.
It also adds a testcase which (partly) verifies the output from the errors.
The first commit changes all usage of direct equality-checks on core errors, into
using errors.Is. The second commit adds contextual information. This wraps most
of the core errors with more information, and also wraps it one more time in
stateprocessor, to further provide tx index and tx hash, if such a tx is encoutered in
a block. The third commit uses the chainmaker to try to generate chains with such
errors in them, thus triggering the errors and checking that the generated string meets
expectations.
* miner: exit loop when downloader Done or Failed
Following the logic of the comment at the method,
this fixes a regression introduced at 7cf56d6f064869cb62b1673f9ee437020c595391
, which would allow external parties to DoS with
blocks, preventing mining progress.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: remove ineff assign (lint)
Signed-off-by: meows <b5c6@protonmail.com>
* miner: update test re downloader events
Signed-off-by: meows <b5c6@protonmail.com>
* Revert "miner: remove ineff assign (lint)"
This reverts commit eaefcd34ab4862ebc936fb8a07578aa2744bc058.
* Revert "miner: exit loop when downloader Done or Failed"
This reverts commit 23abd34265aa246c38fc390bb72572ad6ae9fe3b.
* miner: add test showing imprecise TestMiner
Signed-off-by: meows <b5c6@protonmail.com>
* miner: fix waitForMiningState precision
This helper function would return an affirmation
on the first positive match on a desired bool.
This was imprecise; it return false positives
by not waiting initially for an 'updated' value.
This fix causes TestMiner_2 to fail, which is
expected.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: remove TestMiner_2 demonstrating broken test
This test demonstrated the imprecision of the test
helper function waitForMiningState. This function
has been fixed with 6d365c2851, and this test test
may now be removed.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: fix test regarding downloader event/mining expectations
See comment for logic.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: add test describing expectations for downloader/mining events
We expect that once the downloader emits a DoneEvent,
signaling a successful sync, that subsequent StartEvents
are not longer permitted to stop the miner.
This prevents a security vulnerability where forced syncs via
fake high blocks would stall mining operation.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: use 'canStop' state to fix downloader event handling
- Break downloader event handling into event
separating Done and Failed events. We need to
treat these cases differently since a DoneEvent
should prevent the miner from being stopped on
subsequent downloader Start events.
- Use canStop state to handle the one-off
case when a downloader first succeeds.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: improve comment wording
Signed-off-by: meows <b5c6@protonmail.com>
* miner: start mining on downloader events iff not already mining
Signed-off-by: meows <b5c6@protonmail.com>
* miner: refactor miner update logic w/r/t downloader events
This makes mining pause/start logic regarding downloader
events more explicit. Instead of eternally handling downloader
events after the first done event, the subscription is closed
when downloader events are no longer actionable.
Signed-off-by: meows <b5c6@protonmail.com>
* miner: fix handling downloader events on subcription closed
Signed-off-by: meows <b5c6@protonmail.com>
* miner: (lint:gosimple) use range over chan instead of for/select
Signed-off-by: meows <b5c6@protonmail.com>
* miner: refactor update loop to remove race condition
The go routine handling the downloader events handling
vars in parallel with the parent routine, causing a
race condition.
This change, though ugly, remove the condition while
still allowing the downloader event subscription to be
closed when the miner has no further use for it (ie DoneEvent).
* miner: alternate fix for miner-flaw
Co-authored-by: meows <b5c6@protonmail.com>
This PR changes several different things:
- Adds test cases for the miner loop
- Stops the worker if it wasn't already stopped in worker.Close()
- Uses channels instead of atomics in the miner.update() loop
Co-authored-by: Felix Lange <fjl@twurst.com>
This PR significantly changes the APIs for instantiating Ethereum nodes in
a Go program. The new APIs are not backwards-compatible, but we feel that
this is made up for by the much simpler way of registering services on
node.Node. You can find more information and rationale in the design
document: https://gist.github.com/renaynay/5bec2de19fde66f4d04c535fd24f0775.
There is also a new feature in Node's Go API: it is now possible to
register arbitrary handlers on the user-facing HTTP server. In geth, this
facility is used to enable GraphQL.
There is a single minor change relevant for geth users in this PR: The
GraphQL API is no longer available separately from the JSON-RPC HTTP
server. If you want GraphQL, you need to enable it using the
./geth --http --graphql flag combination.
The --graphql.port and --graphql.addr flags are no longer available.
* eth/downloader tests: fix spurious failing test due to race between receipts/headers
* miner tests: fix travis failure on arm64
* eth/downloader: tests - store td in ancients too
* cmd, miner: add noempty-precommit flag
* cmd, miner: get rid of external flag
* miner: change bool to atomic int
* miner: fix tiny typo
Co-authored-by: Péter Szilágyi <peterke@gmail.com>
* cmd, core, eth: init tx lookup in background
* core/rawdb: tiny log fixes to make it clearer what's happening
* core, eth: fix rebase errors
* core/rawdb: make reindexing less generic, but more optimal
* rlp: implement rlp list iterator
* core/rawdb: new implementation of tx indexing/unindex using generic tx iterator and hashing rlp-data
* core/rawdb, cmd/utils: fix review concerns
* cmd/utils: fix merge issue
* core/rawdb: add some log formatting polishes
Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>
* cmd/utils: make goerli the default testnet
* cmd/geth: explicitly rename testnet to ropsten
* core: explicitly rename testnet to ropsten
* params: explicitly rename testnet to ropsten
* cmd: explicitly rename testnet to ropsten
* miner: explicitly rename testnet to ropsten
* mobile: allow for returning the goerli spec
* tests: explicitly rename testnet to ropsten
* docs: update readme to reflect changes to the default testnet
* mobile: allow for configuring goerli and rinkeby nodes
* cmd/geth: revert --testnet back to ropsten and mark as legacy
* cmd/util: mark --testnet flag as deprecated
* docs: update readme to properly reflect the 3 testnets
* cmd/utils: add an explicit deprecation warning on startup
* cmd/utils: swap goerli and ropsten in usage
* cmd/geth: swap goerli and ropsten in usage
* cmd/geth: if running a known preset, log it for convenience
* docs: improve readme on usage of ropsten's testnet datadir
* cmd/utils: check if legacy `testnet` datadir exists for ropsten
* cmd/geth: check for legacy testnet path in console command
* cmd/geth: use switch statement for complex conditions in main
* cmd/geth: move known preset log statement to the very top
* cmd/utils: create new ropsten configurations in the ropsten datadir
* cmd/utils: makedatadir should check for existing testnet dir
* cmd/geth: add legacy testnet flag to the copy db command
* cmd/geth: add legacy testnet flag to the inspect command
The leaks were mostly in unit tests, and could all be resolved by
adding suitably-sized channel buffers or by restructuring the test
to not send on a channel after an error has occurred.
There is an unavoidable goroutine leak in Console.Interactive: when
we receive a signal, the line reader cannot be unblocked and will get
stuck. This leak is now documented and I've tried to make it slightly
less bad by adding a one-element buffer to the output channels of
the line-reading loop. Should the reader eventually awake from its
blocked state (i.e. when stdin is closed), at least it won't get stuck
trying to send to the interpreter loop which has quit long ago.
Co-authored-by: Felix Lange <fjl@twurst.com>
This change:
- removes the PostChainEvents method on core.BlockChain.
- sorts 'removed log' events by block number.
- fire the NewChainHead event if we inject a canonical block into the chain
even if the entire insertion is not successful.
- guarantees correct event ordering in all cases.
* travis: Enable ARM support
* Include fixes from 20039
* Add a trace to debug the invalid lookup issue
* Try increasing the timeout to see if the arm test passes
* Investigate the resolver issue
* Increase arm64 timeout for clique test
* increase timeout in tests for arm64
* Only test the failing tests
* Review feedback: don't export epsilon
* Remove investigation tricks+include fjl's feeback
* Revert the retry ahead of using the mock resolver
* Fix rebase errors
This PR adds a new unit test in miner package which will create some blocks from miner and then import into another chain. In this way, we can ensure all blocks generated by Geth miner obey consensus rules.
* cmd, eth, miner: disable advance sealing if user require
* cmd, console, miner, les, eth: wrap the miner config
* eth: remove todo
* cmd, miner: revert noadvance flag
The reason for this is: if the transaction execution is even longer
than block time, then this kind of transactions is DoS attack.
* node: close AccountsManager in new Close method
* p2p/simulations, p2p/simulations/adapters: handle node close on shutdown
* node: move node ephemeralKeystore cleanup to stop method
* node: call Stop in Node.Close method
* cmd/geth: close node.Node created with makeFullNode in cli commands
* node: close Node instances in tests
* cmd/geth, node: minor code style fixes
* cmd, console, miner, mobile: proper node Close() termination
Until this commit, when sending an RPC request that called `NewEVM`, a blank `vm.Config`
would be taken so as to set some options, based on the default configuration. If some extra
configuration switches were passed to the blockchain, those would be ignored.
This PR adds a function to get the config from the blockchain, and this is what is now used
for RPC calls.
Some subsequent changes need to be made, see https://github.com/ethereum/go-ethereum/pull/17955#pullrequestreview-182237244
for the details of the discussion.
