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getter.go
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getter.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package getter
import (
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/engine/common"
"github.com/ava-labs/avalanchego/snow/engine/snowman/block"
"github.com/ava-labs/avalanchego/utils/constants"
"github.com/ava-labs/avalanchego/utils/logging"
"github.com/ava-labs/avalanchego/utils/metric"
)
// Get requests are always served, regardless node state (bootstrapping or normal operations).
var _ common.AllGetsServer = &getter{}
func New(
vm block.ChainVM,
commonCfg common.Config,
stateSyncDisableRequests bool,
) (common.AllGetsServer, error) {
ssVM, _ := vm.(block.StateSyncableVM)
gh := &getter{
vm: vm,
ssVM: ssVM,
sender: commonCfg.Sender,
cfg: commonCfg,
stateSyncDisabled: stateSyncDisableRequests,
log: commonCfg.Ctx.Log,
}
var err error
gh.getAncestorsBlks, err = metric.NewAverager(
"bs",
"get_ancestors_blks",
"blocks fetched in a call to GetAncestors",
commonCfg.Ctx.Registerer,
)
return gh, err
}
type getter struct {
vm block.ChainVM
ssVM block.StateSyncableVM // can be nil
sender common.Sender
cfg common.Config
stateSyncDisabled bool
log logging.Logger
getAncestorsBlks metric.Averager
}
func (gh *getter) GetStateSummaryFrontier(nodeID ids.NodeID, requestID uint32) error {
if gh.stateSyncDisabled {
gh.log.Debug("state sync requests explicitly disabled. Dropping GetStateSummaryFrontier(%s, %d)", nodeID, requestID)
return nil
}
if gh.ssVM == nil {
gh.log.Debug("state sync not supported. Dropping GetStateSummaryFrontier(%s, %d)", nodeID, requestID)
return nil
}
summary, err := gh.ssVM.GetLastStateSummary()
if err != nil {
gh.log.Debug("couldn't get state summary frontier with %s. Dropping GetStateSummaryFrontier(%s, %d)",
err, nodeID, requestID)
return nil
}
gh.sender.SendStateSummaryFrontier(nodeID, requestID, summary.Bytes())
return nil
}
func (gh *getter) GetAcceptedStateSummary(nodeID ids.NodeID, requestID uint32, heights []uint64) error {
if gh.stateSyncDisabled {
gh.log.Debug("state sync requests explicitly disabled. Dropping GetStateSummaryFrontier(%s, %d)", nodeID, requestID)
return nil
}
// If there are no requested heights, then we can return the result
// immediately, regardless of if the underlying VM implements state sync.
if len(heights) == 0 {
gh.sender.SendAcceptedStateSummary(nodeID, requestID, nil)
return nil
}
if gh.ssVM == nil {
gh.log.Debug("state sync not supported. Dropping GetAcceptedStateSummary(%s, %d)",
nodeID, requestID)
return nil
}
summaryIDs := make([]ids.ID, 0, len(heights))
for _, height := range heights {
summary, err := gh.ssVM.GetStateSummary(height)
if err == block.ErrStateSyncableVMNotImplemented {
gh.log.Debug("state sync not supported. Dropping GetAcceptedStateSummary(%s, %d)",
nodeID, requestID)
return nil
}
if err != nil {
gh.log.Debug("couldn't get state summary with height %d due to %s",
height, err)
continue
}
summaryIDs = append(summaryIDs, summary.ID())
}
gh.sender.SendAcceptedStateSummary(nodeID, requestID, summaryIDs)
return nil
}
func (gh *getter) GetAcceptedFrontier(nodeID ids.NodeID, requestID uint32) error {
lastAccepted, err := gh.vm.LastAccepted()
if err != nil {
return err
}
gh.sender.SendAcceptedFrontier(nodeID, requestID, []ids.ID{lastAccepted})
return nil
}
func (gh *getter) GetAccepted(nodeID ids.NodeID, requestID uint32, containerIDs []ids.ID) error {
acceptedIDs := make([]ids.ID, 0, len(containerIDs))
for _, blkID := range containerIDs {
if blk, err := gh.vm.GetBlock(blkID); err == nil && blk.Status() == choices.Accepted {
acceptedIDs = append(acceptedIDs, blkID)
}
}
gh.sender.SendAccepted(nodeID, requestID, acceptedIDs)
return nil
}
func (gh *getter) GetAncestors(nodeID ids.NodeID, requestID uint32, blkID ids.ID) error {
ancestorsBytes, err := block.GetAncestors(
gh.vm,
blkID,
gh.cfg.AncestorsMaxContainersSent,
constants.MaxContainersLen,
gh.cfg.MaxTimeGetAncestors,
)
if err != nil {
gh.log.Verbo("couldn't get ancestors with %s. Dropping GetAncestors(%s, %d, %s)",
err, nodeID, requestID, blkID)
return nil
}
gh.getAncestorsBlks.Observe(float64(len(ancestorsBytes)))
gh.sender.SendAncestors(nodeID, requestID, ancestorsBytes)
return nil
}
func (gh *getter) Get(nodeID ids.NodeID, requestID uint32, blkID ids.ID) error {
blk, err := gh.vm.GetBlock(blkID)
if err != nil {
// If we failed to get the block, that means either an unexpected error
// has occurred, [vdr] is not following the protocol, or the
// block has been pruned.
gh.log.Debug("Get(%s, %d, %s) failed with: %s", nodeID, requestID, blkID, err)
return nil
}
// Respond to the validator with the fetched block and the same requestID.
gh.sender.SendPut(nodeID, requestID, blkID, blk.Bytes())
return nil
}