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batched_vm.go
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/
batched_vm.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package proposervm
import (
"context"
"time"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/consensus/snowman"
"github.com/ava-labs/avalanchego/snow/engine/snowman/block"
"github.com/ava-labs/avalanchego/utils/wrappers"
statelessblock "github.com/ava-labs/avalanchego/vms/proposervm/block"
)
var _ block.BatchedChainVM = (*VM)(nil)
func (vm *VM) GetAncestors(
ctx context.Context,
blkID ids.ID,
maxBlocksNum int,
maxBlocksSize int,
maxBlocksRetrievalTime time.Duration,
) ([][]byte, error) {
if vm.batchedVM == nil {
return nil, block.ErrRemoteVMNotImplemented
}
res := make([][]byte, 0, maxBlocksNum)
currentByteLength := 0
startTime := vm.Clock.Time()
// hereinafter loop over proposerVM cache and DB, possibly till snowman++
// fork is hit
for {
blk, err := vm.getStatelessBlk(blkID)
if err != nil {
// maybe we have hit the proposerVM fork here?
break
}
blkBytes := blk.Bytes()
// Ensure response size isn't too large. Include wrappers.IntLen because
// the size of the message is included with each container, and the size
// is repr. by an int.
currentByteLength += wrappers.IntLen + len(blkBytes)
elapsedTime := vm.Clock.Time().Sub(startTime)
if len(res) > 0 && (currentByteLength >= maxBlocksSize || maxBlocksRetrievalTime <= elapsedTime) {
return res, nil // reached maximum size or ran out of time
}
res = append(res, blkBytes)
blkID = blk.ParentID()
if len(res) >= maxBlocksNum {
return res, nil
}
}
// snowman++ fork may have been hit.
preMaxBlocksNum := maxBlocksNum - len(res)
preMaxBlocksSize := maxBlocksSize - currentByteLength
preMaxBlocksRetrivalTime := maxBlocksRetrievalTime - time.Since(startTime)
innerBytes, err := vm.batchedVM.GetAncestors(
ctx,
blkID,
preMaxBlocksNum,
preMaxBlocksSize,
preMaxBlocksRetrivalTime,
)
if err != nil {
if len(res) == 0 {
return nil, err
}
return res, nil // return what we have
}
res = append(res, innerBytes...)
return res, nil
}
func (vm *VM) BatchedParseBlock(ctx context.Context, blks [][]byte) ([]snowman.Block, error) {
if vm.batchedVM == nil {
return nil, block.ErrRemoteVMNotImplemented
}
type partialData struct {
index int
block statelessblock.Block
}
var (
blocksIndex int
blocks = make([]snowman.Block, len(blks))
innerBlocksIndex int
statelessBlockDescs = make([]partialData, 0, len(blks))
innerBlockBytes = make([][]byte, 0, len(blks))
)
for ; blocksIndex < len(blks); blocksIndex++ {
blkBytes := blks[blocksIndex]
statelessBlock, err := statelessblock.Parse(blkBytes)
if err != nil {
break
}
blkID := statelessBlock.ID()
block, exists := vm.verifiedBlocks[blkID]
if exists {
blocks[blocksIndex] = block
continue
}
statelessBlockDescs = append(statelessBlockDescs, partialData{
index: blocksIndex,
block: statelessBlock,
})
innerBlockBytes = append(innerBlockBytes, statelessBlock.Block())
}
innerBlockBytes = append(innerBlockBytes, blks[blocksIndex:]...)
// parse all inner blocks at once
innerBlks, err := vm.batchedVM.BatchedParseBlock(ctx, innerBlockBytes)
if err != nil {
return nil, err
}
for ; innerBlocksIndex < len(statelessBlockDescs); innerBlocksIndex++ {
statelessBlockDesc := statelessBlockDescs[innerBlocksIndex]
statelessBlk := statelessBlockDesc.block
blkID := statelessBlk.ID()
_, status, err := vm.State.GetBlock(blkID)
if err == database.ErrNotFound {
status = choices.Processing
} else if err != nil {
return nil, err
}
if statelessSignedBlock, ok := statelessBlk.(statelessblock.SignedBlock); ok {
blocks[statelessBlockDesc.index] = &postForkBlock{
SignedBlock: statelessSignedBlock,
postForkCommonComponents: postForkCommonComponents{
vm: vm,
innerBlk: innerBlks[innerBlocksIndex],
status: status,
},
}
} else {
blocks[statelessBlockDesc.index] = &postForkOption{
Block: statelessBlk,
postForkCommonComponents: postForkCommonComponents{
vm: vm,
innerBlk: innerBlks[innerBlocksIndex],
status: status,
},
}
}
}
for ; blocksIndex < len(blocks); blocksIndex, innerBlocksIndex = blocksIndex+1, innerBlocksIndex+1 {
blocks[blocksIndex] = &preForkBlock{
Block: innerBlks[innerBlocksIndex],
vm: vm,
}
}
return blocks, nil
}
func (vm *VM) getStatelessBlk(blkID ids.ID) (statelessblock.Block, error) {
if currentBlk, exists := vm.verifiedBlocks[blkID]; exists {
return currentBlk.getStatelessBlk(), nil
}
statelessBlock, _, err := vm.State.GetBlock(blkID)
return statelessBlock, err
}