github.com/jincm/wesharechain@v0.0.0-20210122032815-1537409ce26a/chain/swarm/network/simulation/bucket.go (about)

     1  // Copyright 2018 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package simulation
    18  
    19  import "github.com/ethereum/go-ethereum/p2p/enode"
    20  
    21  // BucketKey is the type that should be used for keys in simulation buckets.
    22  type BucketKey string
    23  
    24  // NodeItem returns an item set in ServiceFunc function for a particular node.
    25  func (s *Simulation) NodeItem(id enode.ID, key interface{}) (value interface{}, ok bool) {
    26  	s.mu.Lock()
    27  	defer s.mu.Unlock()
    28  
    29  	if _, ok := s.buckets[id]; !ok {
    30  		return nil, false
    31  	}
    32  	return s.buckets[id].Load(key)
    33  }
    34  
    35  // SetNodeItem sets a new item associated with the node with provided NodeID.
    36  // Buckets should be used to avoid managing separate simulation global state.
    37  func (s *Simulation) SetNodeItem(id enode.ID, key interface{}, value interface{}) {
    38  	s.mu.Lock()
    39  	defer s.mu.Unlock()
    40  
    41  	s.buckets[id].Store(key, value)
    42  }
    43  
    44  // NodesItems returns a map of items from all nodes that are all set under the
    45  // same BucketKey.
    46  func (s *Simulation) NodesItems(key interface{}) (values map[enode.ID]interface{}) {
    47  	s.mu.RLock()
    48  	defer s.mu.RUnlock()
    49  
    50  	ids := s.NodeIDs()
    51  	values = make(map[enode.ID]interface{}, len(ids))
    52  	for _, id := range ids {
    53  		if _, ok := s.buckets[id]; !ok {
    54  			continue
    55  		}
    56  		if v, ok := s.buckets[id].Load(key); ok {
    57  			values[id] = v
    58  		}
    59  	}
    60  	return values
    61  }
    62  
    63  // UpNodesItems returns a map of items with the same BucketKey from all nodes that are up.
    64  func (s *Simulation) UpNodesItems(key interface{}) (values map[enode.ID]interface{}) {
    65  	s.mu.RLock()
    66  	defer s.mu.RUnlock()
    67  
    68  	ids := s.UpNodeIDs()
    69  	values = make(map[enode.ID]interface{})
    70  	for _, id := range ids {
    71  		if _, ok := s.buckets[id]; !ok {
    72  			continue
    73  		}
    74  		if v, ok := s.buckets[id].Load(key); ok {
    75  			values[id] = v
    76  		}
    77  	}
    78  	return values
    79  }