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https://github.com/ethereum/go-ethereum.git
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3a754099bf
## Why this should be merged Allows for a drop-in replacement of `snapshot.Tree` (i.e. one that uses block hashes instead of state roots). This is intended as a temporary solution while we investigate having the state root affected by the block hash to remove path ambiguity. ## How this works Introduction of: 1. `state.SnapshotTree` interface to match methods required on `snapshot.Tree` as used by `state.StateDB`; and 2. `stateconf` package for variadic options plumbed by `StateDB.Commit()` through to `SnapshotTree.Update()`. Although variadic (to maintain function call-signature compatibility) only the `stateconf.WithUpdatePayload(any)` is expected to be used. Recipients of the options can access the payload with `stateconf.ExtractUpdatePayload()`. ## How this was tested Unit test demonstrating propagation of `stateconf.UpdateOption` payload.
45 lines
1.8 KiB
Go
45 lines
1.8 KiB
Go
// Copyright 2024 the libevm authors.
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//
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// The libevm additions to go-ethereum are free software: you can redistribute
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// them and/or modify them under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation, either version 3 of the License,
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// or (at your option) any later version.
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//
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// The libevm additions are distributed in the hope that they will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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// General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see
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// <http://www.gnu.org/licenses/>.
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// Package stateconf configures state management.
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package stateconf
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import "github.com/ava-labs/libevm/libevm/options"
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// A SnapshotUpdateOption configures the behaviour of
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// state.SnapshotTree.Update() implementations. This will be removed along with
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// state.SnapshotTree.
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type SnapshotUpdateOption = options.Option[snapshotUpdateConfig]
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type snapshotUpdateConfig struct {
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payload any
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}
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// WithUpdatePayload returns a SnapshotUpdateOption carrying an arbitrary
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// payload. It acts only as a carrier to exploit existing function plumbing and
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// the effect on behaviour is left to the implementation receiving it.
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func WithUpdatePayload(p any) SnapshotUpdateOption {
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return options.Func[snapshotUpdateConfig](func(c *snapshotUpdateConfig) {
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c.payload = p
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})
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}
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// ExtractUpdatePayload returns the payload carried by a [WithUpdatePayload]
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// option. Only one such option can be used at once; behaviour is otherwise
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// undefined.
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func ExtractUpdatePayload(opts ...SnapshotUpdateOption) any {
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return options.As(opts...).payload
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}
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