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// Copyright 2016 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/>.
// Contains all the wrappers from the accounts package to support client side enode
// management on mobile platforms.
package geth
import (
"errors"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/p2p/discv5"
)
// FoundationBootnodes returns the enode URLs of the P2P bootstrap nodes operated
// by the foundation running the V5 discovery protocol.
func FoundationBootnodes() *Enodes {
nodes := &Enodes{nodes: make([]*discv5.Node, len(utils.DiscoveryV5Bootnodes))}
for i, node := range utils.DiscoveryV5Bootnodes {
nodes.nodes[i] = node
}
return nodes
}
// Enode represents a host on the network.
type Enode struct {
node *discv5.Node
}
// NewEnode parses a node designator.
//
// There are two basic forms of node designators
// - incomplete nodes, which only have the public key (node ID)
// - complete nodes, which contain the public key and IP/Port information
//
// For incomplete nodes, the designator must look like one of these
//
// enode://<hex node id>
// <hex node id>
//
// For complete nodes, the node ID is encoded in the username portion
// of the URL, separated from the host by an @ sign. The hostname can
// only be given as an IP address, DNS domain names are not allowed.
// The port in the host name section is the TCP listening port. If the
// TCP and UDP (discovery) ports differ, the UDP port is specified as
// query parameter "discport".
//
// In the following example, the node URL describes
// a node with IP address 10.3.58.6, TCP listening port 30303
// and UDP discovery port 30301.
//
// enode://<hex node id>@10.3.58.6:30303?discport=30301
func NewEnode(rawurl string) (*Enode, error) {
node, err := discv5.ParseNode(rawurl)
if err != nil {
return nil, err
}
return &Enode{node}, nil
}
// Enodes represents a slice of accounts.
type Enodes struct{ nodes []*discv5.Node }
// NewEnodes creates a slice of uninitialized enodes.
func NewEnodes(size int) *Enodes {
return &Enodes{
nodes: make([]*discv5.Node, size),
}
}
// NewEnodesEmpty creates an empty slice of Enode values.
func NewEnodesEmpty() *Enodes {
return NewEnodes(0)
}
// Size returns the number of enodes in the slice.
func (e *Enodes) Size() int {
return len(e.nodes)
}
// Get returns the enode at the given index from the slice.
func (e *Enodes) Get(index int) (*Enode, error) {
if index < 0 || index >= len(e.nodes) {
return nil, errors.New("index out of bounds")
}
return &Enode{e.nodes[index]}, nil
}
// Set sets the enode at the given index in the slice.
func (e *Enodes) Set(index int, enode *Enode) error {
if index < 0 || index >= len(e.nodes) {
return errors.New("index out of bounds")
}
e.nodes[index] = enode.node
return nil
}
// Append adds a new enode element to the end of the slice.
func (e *Enodes) Append(enode *Enode) {
e.nodes = append(e.nodes, enode.node)
}
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