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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package simulations
import (
"errors"
"strings"
"github.com/ethereum/go-ethereum/p2p/enode"
)
var (
ErrNodeNotFound = errors.New("node not found")
)
// ConnectToLastNode connects the node with provided NodeID
// to the last node that is up, and avoiding connection to self.
// It is useful when constructing a chain network topology
// when Network adds and removes nodes dynamically.
func (net *Network) ConnectToLastNode(id enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
ids := net.getUpNodeIDs()
l := len(ids)
if l < 2 {
return nil
}
last := ids[l-1]
if last == id {
last = ids[l-2]
}
return net.connectNotConnected(last, id)
}
// ConnectToRandomNode connects the node with provided NodeID
// to a random node that is up.
func (net *Network) ConnectToRandomNode(id enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
selected := net.getRandomUpNode(id)
if selected == nil {
return ErrNodeNotFound
}
return net.connectNotConnected(selected.ID(), id)
}
// ConnectNodesFull connects all nodes one to another.
// It provides a complete connectivity in the network
// which should be rarely needed.
func (net *Network) ConnectNodesFull(ids []enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
if ids == nil {
ids = net.getUpNodeIDs()
}
for i, lid := range ids {
for _, rid := range ids[i+1:] {
if err = net.connectNotConnected(lid, rid); err != nil {
return err
}
}
}
return nil
}
// ConnectNodesChain connects all nodes in a chain topology.
// If ids argument is nil, all nodes that are up will be connected.
func (net *Network) ConnectNodesChain(ids []enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
return net.connectNodesChain(ids)
}
func (net *Network) connectNodesChain(ids []enode.ID) (err error) {
if ids == nil {
ids = net.getUpNodeIDs()
}
l := len(ids)
for i := 0; i < l-1; i++ {
if err := net.connectNotConnected(ids[i], ids[i+1]); err != nil {
return err
}
}
return nil
}
// ConnectNodesRing connects all nodes in a ring topology.
// If ids argument is nil, all nodes that are up will be connected.
func (net *Network) ConnectNodesRing(ids []enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
if ids == nil {
ids = net.getUpNodeIDs()
}
l := len(ids)
if l < 2 {
return nil
}
if err := net.connectNodesChain(ids); err != nil {
return err
}
return net.connectNotConnected(ids[l-1], ids[0])
}
// ConnectNodesStar connects all nodes into a star topology
// If ids argument is nil, all nodes that are up will be connected.
func (net *Network) ConnectNodesStar(ids []enode.ID, center enode.ID) (err error) {
net.lock.Lock()
defer net.lock.Unlock()
if ids == nil {
ids = net.getUpNodeIDs()
}
for _, id := range ids {
if center == id {
continue
}
if err := net.connectNotConnected(center, id); err != nil {
return err
}
}
return nil
}
func (net *Network) connectNotConnected(oneID, otherID enode.ID) error {
return ignoreAlreadyConnectedErr(net.connect(oneID, otherID))
}
func ignoreAlreadyConnectedErr(err error) error {
if err == nil || strings.Contains(err.Error(), "already connected") {
return nil
}
return err
}
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