github.com/MetalBlockchain/metalgo@v1.11.9/snow/engine/common/tracker/accepted.go (about)

     1  // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
     2  // See the file LICENSE for licensing terms.
     3  
     4  package tracker
     5  
     6  import (
     7  	"sync"
     8  
     9  	"github.com/MetalBlockchain/metalgo/ids"
    10  	"github.com/MetalBlockchain/metalgo/snow/validators"
    11  	"github.com/MetalBlockchain/metalgo/utils/crypto/bls"
    12  	"github.com/MetalBlockchain/metalgo/utils/set"
    13  )
    14  
    15  var _ Accepted = (*accepted)(nil)
    16  
    17  type Accepted interface {
    18  	validators.SetCallbackListener
    19  
    20  	// SetLastAccepted updates the latest accepted block for [nodeID] to
    21  	// [blockID]. If [nodeID] is not currently a validator, this is a noop.
    22  	SetLastAccepted(nodeID ids.NodeID, blockID ids.ID)
    23  	// LastAccepted returns the latest known accepted block of [nodeID]. If
    24  	// [nodeID]'s last accepted block was never unknown, false will be returned.
    25  	LastAccepted(nodeID ids.NodeID) (ids.ID, bool)
    26  }
    27  
    28  type accepted struct {
    29  	lock       sync.RWMutex
    30  	validators set.Set[ids.NodeID]
    31  	frontier   map[ids.NodeID]ids.ID
    32  }
    33  
    34  func NewAccepted() Accepted {
    35  	return &accepted{
    36  		frontier: make(map[ids.NodeID]ids.ID),
    37  	}
    38  }
    39  
    40  func (a *accepted) OnValidatorAdded(nodeID ids.NodeID, _ *bls.PublicKey, _ ids.ID, _ uint64) {
    41  	a.lock.Lock()
    42  	defer a.lock.Unlock()
    43  
    44  	a.validators.Add(nodeID)
    45  }
    46  
    47  func (a *accepted) OnValidatorRemoved(nodeID ids.NodeID, _ uint64) {
    48  	a.lock.Lock()
    49  	defer a.lock.Unlock()
    50  
    51  	a.validators.Remove(nodeID)
    52  	delete(a.frontier, nodeID)
    53  }
    54  
    55  func (*accepted) OnValidatorWeightChanged(_ ids.NodeID, _, _ uint64) {}
    56  
    57  func (a *accepted) SetLastAccepted(nodeID ids.NodeID, frontier ids.ID) {
    58  	a.lock.Lock()
    59  	defer a.lock.Unlock()
    60  
    61  	if a.validators.Contains(nodeID) {
    62  		a.frontier[nodeID] = frontier
    63  	}
    64  }
    65  
    66  func (a *accepted) LastAccepted(nodeID ids.NodeID) (ids.ID, bool) {
    67  	a.lock.RLock()
    68  	defer a.lock.RUnlock()
    69  
    70  	acceptedID, ok := a.frontier[nodeID]
    71  	return acceptedID, ok
    72  }