discover

package
v0.0.0-...-eb4c3ac Latest Latest
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 Go to latest Published: Dec 27, 2019 License: Apache-2.0 Imports: 35 Imported by: 0

Documentation

Overview

Package discover implements the Node Discovery Protocol.

The Node Discovery protocol provides a way to find RLPx nodes that can be connected to. It uses a Kademlia-like protocol to maintain a distributed database of the IDs and endpoints of all listening nodes.

Index

Constants

View Source 
const (
	Dcrmprotocol_type = iota + 1
	Xprotocol_type
	Sdkprotocol_type

	Dcrm_findGroupPacket = iota + 10 + neighborsPacket //14
	Xp_findGroupPacket
	Sdk_findGroupPacket
	Dcrm_groupPacket
	Sdk_groupPacket
	Xp_groupPacket
	Dcrm_groupInfoPacket
	Sdk_groupStatusPacket
	PeerMsgPacket

	Xp_getCCPacket
)
View Source 
const NodeIDBits = 512

Variables

View Source 
var (
	Dcrmdelimiter  = "dcrmmsg"
	Dcrm_groupList *Group
	Xp_groupList   *Group

	RemoteIP     = "127.0.0.1"
	RemotePort   = "0"
	RemoteUpdate = false

	Xp_changed = 0

	SDK_groupList map[NodeID]*Group = make(map[NodeID]*Group)

	SelfID = ""
)
View Source 
var (
	Dcrm_groupMemNum = 0
	Xp_groupMemNum   = 0
	SDK_groupNum     = 0
)

Functions

func Compress 

func Compress(c []byte) (string, error)

func Decode2 

func Decode2(s string, datatype string) (interface{}, error)

func Encode2 

func Encode2(obj interface{}) (string, error)

func GetEnode 

func GetEnode() string

func GetEnodeStatus 

func GetEnodeStatus(enode string) (string, string)

func GetLocalIP 

func GetLocalIP() string

func GetRemoteIP 

func GetRemoteIP() string

func GetRemotePort 

func GetRemotePort() string

func InitGroup 

func InitGroup(groupsNum, nodesNum int) error

func ParseNodes 

func ParseNodes(n []*Node) (int, string)

func PingNode 

func PingNode(id NodeID, ip net.IP, port int) error

func RecoverGroupAll 

func RecoverGroupAll(SdkGroup map[NodeID]*Group) error

func RegisterDcrmMsgCallback 

func RegisterDcrmMsgCallback(callbackfunc func(interface{}) <-chan string)

func RegisterDcrmMsgRetCallback 

func RegisterDcrmMsgRetCallback(callbackfunc func(interface{}))

func RegisterGroupCallback 

func RegisterGroupCallback(callbackfunc func(NodeID, string, interface{}, int, string))

func RegisterPriKeyCallback 

func RegisterPriKeyCallback(callbackfunc func(interface{}))

func RegisterSdkMsgCallback 

func RegisterSdkMsgCallback(sdkbackfunc func(interface{}, string) <-chan string)

func RegisterSdkMsgRetCallback 

func RegisterSdkMsgRetCallback(sdkbackfunc func(interface{}, string))

func RegisterSendCallback 

func RegisterSendCallback(callbackfunc func(interface{}))

func RegisterUpdateOrderCacheCallback 

func RegisterUpdateOrderCacheCallback(callbackfunc func(interface{}))

func RegisterXpMsgCallback 

func RegisterXpMsgCallback(callbackfunc func(interface{}) <-chan string)

func RegisterXpMsgRetCallback 

func RegisterXpMsgRetCallback(callbackfunc func(interface{}))

func SendMsgToNode 

func SendMsgToNode(toid NodeID, toaddr *net.UDPAddr, msg string) error

send group info

func SendToGroup 

func SendToGroup(gid NodeID, msg string, allNodes bool, p2pType int, gg []*Node) (string, error)

func SendToGroupCC 

func SendToGroupCC(toid NodeID, toaddr *net.UDPAddr, msg string, p2pType int) (string, error)

func SendToMyselfAndReturn 

func SendToMyselfAndReturn(selfID, msg string, p2pType int)

func SendToPeer 

func SendToPeer(gid, toid NodeID, toaddr *net.UDPAddr, msg string, p2pType int) error

func StartCreateSDKGroup 

func StartCreateSDKGroup(gid NodeID, mode string, enode []*Node, Type string) string

func StoreGroupToDb 

func StoreGroupToDb(groupInfo *Group) error

func UnCompress 

func UnCompress(s string) (string, error)

func UpdateGroupNodesNumber 

func UpdateGroupNodesNumber(number, p2pType int)

Types

type Config 

type Config struct {
	// These settings are required and configure the UDP listener:
	PrivateKey *ecdsa.PrivateKey

	// These settings are optional:
	AnnounceAddr *net.UDPAddr      // local address announced in the DHT
	NodeDBPath   string            // if set, the node database is stored at this filesystem location
	NetRestrict  *netutil.Netlist  // network whitelist
	Bootnodes    []*Node           // list of bootstrap nodes
	Unhandled    chan<- ReadPacket // unhandled packets are sent on this channel
}

Config holds Table-related settings.

type Group 

type Group struct {
	sync.Mutex
	ID NodeID
	//Gname      string
	Mode string // 2/3

	P2pType byte
	Nodes   []RpcNode
	Type    string // group type: 1+2, 1+1+1
	//userID      []string
	Expiration uint64
	// Ignore additional fields (for forward compatibility).
	Rest []rlp.RawValue `rlp:"tail"`
	// contains filtered or unexported fields
}

func NewGroup 

func NewGroup() *Group

func RecoverGroupByGID 

func RecoverGroupByGID(gid NodeID) (*Group, error)

type Node 

type Node struct {
	IP       net.IP // len 4 for IPv4 or 16 for IPv6
	UDP, TCP uint16 // port numbers
	ID       NodeID // the node's public key
	// contains filtered or unexported fields
}

Node represents a host on the network. The fields of Node may not be modified.

func GetGroup 

func GetGroup(gid, id NodeID, addr *net.UDPAddr, target NodeID, p2pType int) []*Node

func MustParseNode 

func MustParseNode(rawurl string) *Node

MustParseNode parses a node URL. It panics if the URL is not valid.

func NewNode 

func NewNode(id NodeID, ip net.IP, udpPort, tcpPort uint16) *Node

NewNode creates a new node. It is mostly meant to be used for testing purposes.

func ParseNode 

func ParseNode(rawurl string) (*Node, error)

ParseNode 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 (*Node) Incomplete 

func (n *Node) Incomplete() bool

Incomplete returns true for nodes with no IP address.

func (*Node) MarshalText 

func (n *Node) MarshalText() ([]byte, error)

MarshalText implements encoding.TextMarshaler.

func (*Node) String 

func (n *Node) String() string

The string representation of a Node is a URL. Please see ParseNode for a description of the format.

func (*Node) UnmarshalText 

func (n *Node) UnmarshalText(text []byte) error

UnmarshalText implements encoding.TextUnmarshaler.

type NodeID 

type NodeID [NodeIDBits / 8]byte

NodeID is a unique identifier for each node. The node identifier is a marshaled elliptic curve public key.

func BytesID 

func BytesID(b []byte) (NodeID, error)

BytesID converts a byte slice to a NodeID

func GetLocalID 

func GetLocalID() NodeID

func HexID 

func HexID(in string) (NodeID, error)

HexID converts a hex string to a NodeID. The string may be prefixed with 0x.

func MustBytesID 

func MustBytesID(b []byte) NodeID

MustBytesID converts a byte slice to a NodeID. It panics if the byte slice is not a valid NodeID.

func MustHexID 

func MustHexID(in string) NodeID

MustHexID converts a hex string to a NodeID. It panics if the string is not a valid NodeID.

func PubkeyID 

func PubkeyID(pub *ecdsa.PublicKey) NodeID

PubkeyID returns a marshaled representation of the given public key.

func (NodeID) Bytes 

func (n NodeID) Bytes() []byte

Bytes returns a byte slice representation of the NodeID

func (NodeID) GoString 

func (n NodeID) GoString() string

The Go syntax representation of a NodeID is a call to HexID.

func (NodeID) MarshalText 

func (n NodeID) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (NodeID) Pubkey 

func (id NodeID) Pubkey() (*ecdsa.PublicKey, error)

Pubkey returns the public key represented by the node ID. It returns an error if the ID is not a point on the curve.

func (NodeID) String 

func (n NodeID) String() string

NodeID prints as a long hexadecimal number.

func (NodeID) TerminalString 

func (n NodeID) TerminalString() string

TerminalString returns a shortened hex string for terminal logging.

func (*NodeID) UnmarshalText 

func (n *NodeID) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

type ReadPacket 

type ReadPacket struct {
	Data []byte
	Addr *net.UDPAddr
}

ReadPacket is sent to the unhandled channel when it could not be processed

type RpcNode 

type RpcNode struct {
	IP  net.IP // len 4 for IPv4 or 16 for IPv6
	UDP uint16 // for discovery protocol
	TCP uint16 // for RLPx protocol
	ID  NodeID
}

RPC request structures

type Table 

type Table struct {
	// contains filtered or unexported fields
}
var Table4group *Table

func ListenUDP 

func ListenUDP(c conn, cfg Config) (*Table, error)

ListenUDP returns a new table that listens for UDP packets on laddr.

func (*Table) Close 

func (tab *Table) Close()

Close terminates the network listener and flushes the node database.

func (*Table) Lookup 

func (tab *Table) Lookup(targetID NodeID) []*Node

Lookup performs a network search for nodes close to the given target. It approaches the target by querying nodes that are closer to it on each iteration. The given target does not need to be an actual node identifier.

func (*Table) ReadRandomNodes 

func (tab *Table) ReadRandomNodes(buf []*Node) (n int)

ReadRandomNodes fills the given slice with random nodes from the table. It will not write the same node more than once. The nodes in the slice are copies and can be modified by the caller.

func (*Table) Resolve 

func (tab *Table) Resolve(targetID NodeID) *Node

Resolve searches for a specific node with the given ID. It returns nil if the node could not be found.

func (*Table) Self 

func (tab *Table) Self() *Node

Self returns the local node. The returned node should not be modified by the caller.

Source Files

View all Source files

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