nimbus-eth1/nimbus/db/aristo/aristo_utils.nim

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Nim

# nimbus-eth1
# Copyright (c) 2021 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed
# except according to those terms.
## Aristo DB -- Handy Helpers
## ==========================
##
{.push raises: [].}
import
eth/common,
stint,
results,
"."/[aristo_desc, aristo_get]
# ------------------------------------------------------------------------------
# Public helpers
# ------------------------------------------------------------------------------
proc rootHash*(db: AristoDbRef; root = VertexID(1)): Hash256 =
## Shortcut
db.getKey(root).to(Hash256)
# ------------------------------------------------------------------------------
# Public functions, converters
# ------------------------------------------------------------------------------
proc toAccount*(
payload: PayloadRef;
db: AristoDbRef;
): Result[Account,AristoError] =
## Converts the argument `payload` to an `Account` type. If the implied
## account das a storage slots system associated, the database `db` must
## contain the Merkle hash key of the root vertex.
case payload.pType:
of RlpData:
try:
return ok(rlp.decode(payload.rlpBlob, Account))
except RlpError:
return err(AccountRlpDecodingError)
of AccountData:
var acc = Account(
nonce: payload.account.nonce,
balance: payload.account.balance,
codeHash: payload.account.codehash,
storageRoot: EMPTY_ROOT_HASH)
if payload.account.storageID.isValid:
let key = db.getKey payload.account.storageID
if not key.isValid:
return err(AccountStorageKeyMissing)
acc.storageRoot = key.to(Hash256)
return ok(acc)
else:
discard
err PayloadTypeUnsupported
proc toAccount*(
vtx: VertexRef;
db: AristoDbRef;
): Result[Account,AristoError] =
## Variant of `toAccount()` for a `Leaf` vertex.
if vtx.isValid and vtx.vType == Leaf:
return vtx.lData.toAccount db
err AccountVtxUnsupported
proc toAccount*(
node: NodeRef;
): Result[Account,AristoError] =
## Variant of `toAccount()` for a `Leaf` node which must be complete (i.e.
## a potential Merkle hash key must have been initialised.)
if node.isValid and node.vType == Leaf:
case node.lData.pType:
of RlpData:
try:
return ok(rlp.decode(node.lData.rlpBlob, Account))
except RlpError:
return err(AccountRlpDecodingError)
of AccountData:
var acc = Account(
nonce: node.lData.account.nonce,
balance: node.lData.account.balance,
codeHash: node.lData.account.codehash,
storageRoot: EMPTY_ROOT_HASH)
if node.lData.account.storageID.isValid:
if not node.key[0].isValid:
return err(AccountStorageKeyMissing)
acc.storageRoot = node.key[0].to(Hash256)
return ok(acc)
else:
return err(PayloadTypeUnsupported)
err AccountNodeUnsupported
# ---------------------
proc toNode*(
vtx: VertexRef; # Vertex to convert
db: AristoDbRef; # Database, top layer
stopEarly = true; # Full list of missing links if `false`
): Result[NodeRef,seq[VertexID]] =
## Convert argument the vertex `vtx` to a node type. Missing Merkle hash
## keys are searched for on the argument database `db`.
##
## On error, at least the vertex ID of the first missing Merkle hash key is
## returned. If the argument `stopEarly` is set `false`, all missing Merkle
## hash keys are returned.
##
case vtx.vType:
of Leaf:
let node = NodeRef(vType: Leaf, lPfx: vtx.lPfx, lData: vtx.lData)
# Need to resolve storage root for account leaf
if vtx.lData.pType == AccountData:
let vid = vtx.lData.account.storageID
if vid.isValid:
let key = db.getKey vid
if not key.isValid:
return err(@[vid])
node.key[0] = key
return ok node
of Branch:
let node = NodeRef(vType: Branch, bVid: vtx.bVid)
var missing: seq[VertexID]
for n in 0 .. 15:
let vid = vtx.bVid[n]
if vid.isValid:
let key = db.getKey vid
if key.isValid:
node.key[n] = key
else:
missing.add vid
if stopEarly:
break
else:
node.key[n] = VOID_HASH_KEY
if 0 < missing.len:
return err(missing)
return ok node
of Extension:
let
vid = vtx.eVid
key = db.getKey vid
if key.isValid:
let node = NodeRef(vType: Extension, ePfx: vtx.ePfx, eVid: vid)
node.key[0] = key
return ok node
return err(@[vid])
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------