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getter.go
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getter.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package getter
import (
"context"
"time"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/zap"
"github.com/MetalBlockchain/metalgo/ids"
"github.com/MetalBlockchain/metalgo/snow/choices"
"github.com/MetalBlockchain/metalgo/snow/engine/common"
"github.com/MetalBlockchain/metalgo/snow/engine/snowman/block"
"github.com/MetalBlockchain/metalgo/utils/constants"
"github.com/MetalBlockchain/metalgo/utils/logging"
"github.com/MetalBlockchain/metalgo/utils/metric"
"github.com/MetalBlockchain/metalgo/utils/set"
)
// Get requests are always served, regardless node state (bootstrapping or normal operations).
var _ common.AllGetsServer = (*getter)(nil)
func New(
vm block.ChainVM,
sender common.Sender,
log logging.Logger,
maxTimeGetAncestors time.Duration,
maxContainersGetAncestors int,
reg prometheus.Registerer,
) (common.AllGetsServer, error) {
ssVM, _ := vm.(block.StateSyncableVM)
gh := &getter{
vm: vm,
ssVM: ssVM,
sender: sender,
log: log,
maxTimeGetAncestors: maxTimeGetAncestors,
maxContainersGetAncestors: maxContainersGetAncestors,
}
var err error
gh.getAncestorsBlks, err = metric.NewAverager(
"bs",
"get_ancestors_blks",
"blocks fetched in a call to GetAncestors",
reg,
)
return gh, err
}
type getter struct {
vm block.ChainVM
ssVM block.StateSyncableVM // can be nil
sender common.Sender
log logging.Logger
// Max time to spend fetching a container and its ancestors when responding
// to a GetAncestors
maxTimeGetAncestors time.Duration
// Max number of containers in an ancestors message sent by this node.
maxContainersGetAncestors int
getAncestorsBlks metric.Averager
}
func (gh *getter) GetStateSummaryFrontier(ctx context.Context, nodeID ids.NodeID, requestID uint32) error {
// Note: we do not check if gh.ssVM.StateSyncEnabled since we want all
// nodes, including those disabling state sync to serve state summaries if
// these are available
if gh.ssVM == nil {
gh.log.Debug("dropping GetStateSummaryFrontier message",
zap.String("reason", "state sync not supported"),
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
)
return nil
}
summary, err := gh.ssVM.GetLastStateSummary(ctx)
if err != nil {
gh.log.Debug("dropping GetStateSummaryFrontier message",
zap.String("reason", "couldn't get state summary frontier"),
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
zap.Error(err),
)
return nil
}
gh.sender.SendStateSummaryFrontier(ctx, nodeID, requestID, summary.Bytes())
return nil
}
func (gh *getter) GetAcceptedStateSummary(ctx context.Context, nodeID ids.NodeID, requestID uint32, heights set.Set[uint64]) error {
// If there are no requested heights, then we can return the result
// immediately, regardless of if the underlying VM implements state sync.
if heights.Len() == 0 {
gh.sender.SendAcceptedStateSummary(ctx, nodeID, requestID, nil)
return nil
}
// Note: we do not check if gh.ssVM.StateSyncEnabled since we want all
// nodes, including those disabling state sync to serve state summaries if
// these are available
if gh.ssVM == nil {
gh.log.Debug("dropping GetAcceptedStateSummary message",
zap.String("reason", "state sync not supported"),
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
)
return nil
}
summaryIDs := make([]ids.ID, 0, heights.Len())
for height := range heights {
summary, err := gh.ssVM.GetStateSummary(ctx, height)
if err == block.ErrStateSyncableVMNotImplemented {
gh.log.Debug("dropping GetAcceptedStateSummary message",
zap.String("reason", "state sync not supported"),
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
)
return nil
}
if err != nil {
gh.log.Debug("couldn't get state summary",
zap.Uint64("height", height),
zap.Error(err),
)
continue
}
summaryIDs = append(summaryIDs, summary.ID())
}
gh.sender.SendAcceptedStateSummary(ctx, nodeID, requestID, summaryIDs)
return nil
}
func (gh *getter) GetAcceptedFrontier(ctx context.Context, nodeID ids.NodeID, requestID uint32) error {
lastAccepted, err := gh.vm.LastAccepted(ctx)
if err != nil {
return err
}
gh.sender.SendAcceptedFrontier(ctx, nodeID, requestID, lastAccepted)
return nil
}
func (gh *getter) GetAccepted(ctx context.Context, nodeID ids.NodeID, requestID uint32, containerIDs set.Set[ids.ID]) error {
acceptedIDs := make([]ids.ID, 0, containerIDs.Len())
for blkID := range containerIDs {
blk, err := gh.vm.GetBlock(ctx, blkID)
if err == nil && blk.Status() == choices.Accepted {
acceptedIDs = append(acceptedIDs, blkID)
}
}
gh.sender.SendAccepted(ctx, nodeID, requestID, acceptedIDs)
return nil
}
func (gh *getter) GetAncestors(ctx context.Context, nodeID ids.NodeID, requestID uint32, blkID ids.ID) error {
ancestorsBytes, err := block.GetAncestors(
ctx,
gh.log,
gh.vm,
blkID,
gh.maxContainersGetAncestors,
constants.MaxContainersLen,
gh.maxTimeGetAncestors,
)
if err != nil {
gh.log.Verbo("dropping GetAncestors message",
zap.String("reason", "couldn't get ancestors"),
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
zap.Stringer("blkID", blkID),
zap.Error(err),
)
return nil
}
gh.getAncestorsBlks.Observe(float64(len(ancestorsBytes)))
gh.sender.SendAncestors(ctx, nodeID, requestID, ancestorsBytes)
return nil
}
func (gh *getter) Get(ctx context.Context, nodeID ids.NodeID, requestID uint32, blkID ids.ID) error {
blk, err := gh.vm.GetBlock(ctx, 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("failed Get request",
zap.Stringer("nodeID", nodeID),
zap.Uint32("requestID", requestID),
zap.Stringer("blkID", blkID),
zap.Error(err),
)
return nil
}
// Respond to the validator with the fetched block and the same requestID.
gh.sender.SendPut(ctx, nodeID, requestID, blk.Bytes())
return nil
}