105 lines
4.0 KiB
Nim
105 lines
4.0 KiB
Nim
# Nimbus
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# Copyright (c) 2022 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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import
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chronos,
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stint,
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json_rpc/rpcclient,
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web3,
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./computation,
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./state,
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./types,
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../db/accounts_cache
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# Used in synchronous mode.
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proc noLazyDataSource*(): LazyDataSource =
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LazyDataSource(
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ifNecessaryGetStorage: (proc(c: Computation, slot: UInt256): Future[void] {.async.} =
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discard
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)
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)
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# Will be used in asynchronous on-demand-data-fetching mode, once
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# that is implemented.
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proc realLazyDataSource*(client: RpcClient): LazyDataSource =
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LazyDataSource(
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ifNecessaryGetStorage: (proc(c: Computation, slot: UInt256): Future[void] {.async.} =
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# TODO: find some way to check whether we already have it.
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# This is WRONG, but good enough for now, considering this
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# code is unused except in a few tests. I'm working on
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# doing this properly.
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if not c.getStorage(slot).isZero: return
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# FIXME-onDemandStorageNotImplementedYet
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# (I sketched in this code, but haven't actually tried running it yet.)
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echo("Attempting to for-real fetch slot " & $(slot))
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# ethAddressStr("0xfff33a3bd36abdbd412707b8e310d6011454a7ae")
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# check hexDataStr(0.u256).string == res.string
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let ethAddress = c.msg.contractAddress
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let address: Address = Address(ethAddress)
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let quantity: int = slot.truncate(int) # this is probably wrong; what's the right way to convert this?
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let blockId: BlockIdentifier = blockId(c.vmState.parent.blockNumber.truncate(uint64)) # ditto
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let res = await client.eth_getStorageAt(address, quantity, blockId)
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echo("Fetched slot " & $(slot) & ", result is " & $(res))
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let v = res # will res be the actual value, or do I need to convert or something?
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# Before implementing this, see the note from Zahary here:
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# https://github.com/status-im/nimbus-eth1/pull/1260#discussion_r999669139
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#
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# c.vmState.mutateStateDB:
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# db.setStorage(c.msg.contractAddress, slot, UInt256.fromBytesBE(v))
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)
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)
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# Used for unit testing. Contains some prepopulated data.
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proc fakeLazyDataSource*(fakePairs: seq[tuple[key, val: array[32, byte]]]): LazyDataSource =
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LazyDataSource(
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ifNecessaryGetStorage: (proc(c: Computation, slot: UInt256): Future[void] {.async.} =
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# See the comment above.
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if not c.getStorage(slot).isZero: return
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# FIXME-writeAutomatedTestsToShowThatItCanRunConcurrently
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# For now, until I've implemented some more automated way to
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# capture and verify the fact that this can run concurrently,
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# this is useful just to see in the console that the echo
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# statements from multiple Computations can run at the same
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# time and be interleaved.
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# echo("Attempting to fake-fetch slot " & $(slot))
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# await sleepAsync(2.seconds)
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let slotBytes = toBytesBE(slot)
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# The linear search is obviously slow, but doesn't matter
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# for tests with only a few initialStorage entries. Fix
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# this if we ever want to write tests with more.
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for (k, v) in fakePairs:
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if slotBytes == k:
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c.vmState.mutateStateDB:
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db.setStorage(c.msg.contractAddress, slot, UInt256.fromBytesBE(v))
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break
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# echo("Finished fake-fetch of slot " & $(slot))
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)
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)
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# Gotta find the place where we're creating a Computation without setting
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# its asyncFactory in the first place, but this is fine for now.
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proc asyncFactory*(c: Computation): AsyncOperationFactory =
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# Does Nim have an "ifNil" macro/template?
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if isNil(c.vmState.asyncFactory):
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AsyncOperationFactory(lazyDataSource: noLazyDataSource()) # AARDVARK - can I make a singleton?
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else:
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c.vmState.asyncFactory
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