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post_fork_block.go
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post_fork_block.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package proposervm
import (
"context"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/consensus/snowman"
smblock "github.com/ava-labs/avalanchego/snow/engine/snowman/block"
"github.com/ava-labs/avalanchego/vms/proposervm/block"
)
var _ PostForkBlock = (*postForkBlock)(nil)
type postForkBlock struct {
block.SignedBlock
postForkCommonComponents
}
// Accept:
// 1) Sets this blocks status to Accepted.
// 2) Persists this block in storage
// 3) Calls Reject() on siblings of this block and their descendants.
func (b *postForkBlock) Accept(ctx context.Context) error {
if err := b.acceptOuterBlk(); err != nil {
return err
}
return b.acceptInnerBlk(ctx)
}
func (b *postForkBlock) acceptOuterBlk() error {
// Update in-memory references
b.status = choices.Accepted
b.vm.lastAcceptedTime = b.Timestamp()
return b.vm.acceptPostForkBlock(b)
}
func (b *postForkBlock) acceptInnerBlk(ctx context.Context) error {
// mark the inner block as accepted and all conflicting inner blocks as
// rejected
return b.vm.Tree.Accept(ctx, b.innerBlk)
}
func (b *postForkBlock) Reject(context.Context) error {
// We do not reject the inner block here because it may be accepted later
blkID := b.ID()
delete(b.vm.verifiedProposerBlocks, blkID)
delete(b.vm.verifiedBlocks, blkID)
b.status = choices.Rejected
return nil
}
func (b *postForkBlock) Status() choices.Status {
if b.status == choices.Accepted && b.Height() > b.vm.lastAcceptedHeight {
return choices.Processing
}
return b.status
}
// Return this block's parent, or a *missing.Block if
// we don't have the parent.
func (b *postForkBlock) Parent() ids.ID {
return b.ParentID()
}
func (b *postForkBlock) VerifyProposer(ctx context.Context) error {
parent, err := b.vm.getBlock(ctx, b.ParentID())
if err != nil {
return err
}
return parent.verifyProposerPostForkChild(ctx, b)
}
// If Verify() returns nil, Accept() or Reject() will eventually be called on
// [b] and [b.innerBlk]
func (b *postForkBlock) Verify(ctx context.Context) error {
parent, err := b.vm.getBlock(ctx, b.ParentID())
if err != nil {
return err
}
return parent.verifyPostForkChild(ctx, b)
}
// Return the two options for the block that follows [b]
func (b *postForkBlock) Options(ctx context.Context) ([2]snowman.Block, error) {
innerOracleBlk, ok := b.innerBlk.(snowman.OracleBlock)
if !ok {
// [b]'s innerBlk isn't an oracle block
return [2]snowman.Block{}, snowman.ErrNotOracle
}
// The inner block's child options
innerOptions, err := innerOracleBlk.Options(ctx)
if err != nil {
return [2]snowman.Block{}, err
}
parentID := b.ID()
outerOptions := [2]snowman.Block{}
for i, innerOption := range innerOptions {
// Wrap the inner block's child option
statelessOuterOption, err := block.BuildOption(
parentID,
innerOption.Bytes(),
)
if err != nil {
return [2]snowman.Block{}, err
}
outerOptions[i] = &postForkOption{
Block: statelessOuterOption,
postForkCommonComponents: postForkCommonComponents{
vm: b.vm,
innerBlk: innerOption,
status: innerOption.Status(),
},
}
}
return outerOptions, nil
}
// A post-fork block can never have a pre-fork child
func (*postForkBlock) verifyPreForkChild(context.Context, *preForkBlock) error {
return errUnsignedChild
}
func (b *postForkBlock) verifyProposerPostForkChild(ctx context.Context, child *postForkBlock) error {
parentTimestamp := b.Timestamp()
parentPChainHeight := b.PChainHeight()
err := b.postForkCommonComponents.Verify(
ctx,
parentTimestamp,
parentPChainHeight,
child,
)
if err != nil {
return err
}
childID := child.ID()
child.vm.verifiedProposerBlocks[childID] = child
return nil
}
func (b *postForkBlock) verifyPostForkChild(ctx context.Context, child *postForkBlock) error {
parentPChainHeight := b.PChainHeight()
return child.vm.verifyAndRecordInnerBlk(
ctx,
&smblock.Context{
PChainHeight: parentPChainHeight,
},
child,
)
}
func (b *postForkBlock) verifyProposerPostForkOption(ctx context.Context, child *postForkOption) error {
if err := verifyIsOracleBlock(ctx, b.innerBlk); err != nil {
return err
}
// Make sure [b]'s inner block is the parent of [child]'s inner block
expectedInnerParentID := b.innerBlk.ID()
innerParentID := child.innerBlk.Parent()
if innerParentID != expectedInnerParentID {
return errInnerParentMismatch
}
childID := child.ID()
child.vm.verifiedProposerBlocks[childID] = child
return nil
}
func (b *postForkBlock) verifyPostForkOption(ctx context.Context, child *postForkOption) error {
return child.vm.verifyAndRecordInnerBlk(ctx, nil, child)
}
// Return the child (a *postForkBlock) of this block
func (b *postForkBlock) buildChild(ctx context.Context) (Block, error) {
return b.postForkCommonComponents.buildChild(
ctx,
b.ID(),
b.Timestamp(),
b.PChainHeight(),
)
}
func (b *postForkBlock) pChainHeight(context.Context) (uint64, error) {
return b.PChainHeight(), nil
}
func (b *postForkBlock) setStatus(status choices.Status) {
b.status = status
}
func (b *postForkBlock) getStatelessBlk() block.Block {
return b.SignedBlock
}