p2p

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 Go to latest Published: Aug 5, 2019 License: GPL-3.0, Apache-2.0 Imports: 34 Imported by: 0

README

tendermint/tendermint/p2p

CircleCI

tendermint/tendermint/p2p provides an abstraction around peer-to-peer communication.

MConnection

MConnection is a multiplex connection:

multiplex noun a system or signal involving simultaneous transmission of several messages along a single channel of communication.

Each MConnection handles message transmission on multiple abstract communication Channels. Each channel has a globally unique byte id. The byte id and the relative priorities of each Channel are configured upon initialization of the connection.

The MConnection supports three packet types: Ping, Pong, and Msg.

Ping and Pong

The ping and pong messages consist of writing a single byte to the connection; 0x1 and 0x2, respectively

When we haven't received any messages on an MConnection in a time pingTimeout, we send a ping message. When a ping is received on the MConnection, a pong is sent in response.

If a pong is not received in sufficient time, the peer's score should be decremented (TODO).

Msg

Messages in channels are chopped into smaller msgPackets for multiplexing.

type msgPacket struct {
	ChannelID byte
	EOF       byte // 1 means message ends here.
	Bytes     []byte
}

The msgPacket is serialized using go-wire, and prefixed with a 0x3. The received Bytes of a sequential set of packets are appended together until a packet with EOF=1 is received, at which point the complete serialized message is returned for processing by the corresponding channels onReceive function.

Multiplexing

Messages are sent from a single sendRoutine, which loops over a select statement that results in the sending of a ping, a pong, or a batch of data messages. The batch of data messages may include messages from multiple channels. Message bytes are queued for sending in their respective channel, with each channel holding one unsent message at a time. Messages are chosen for a batch one a time from the channel with the lowest ratio of recently sent bytes to channel priority.

Sending Messages

There are two methods for sending messages:

func (m MConnection) Send(chID byte, msg interface{}) bool {}
func (m MConnection) TrySend(chID byte, msg interface{}) bool {}

Send(chID, msg) is a blocking call that waits until msg is successfully queued for the channel with the given id byte chID. The message msg is serialized using the tendermint/wire submodule's WriteBinary() reflection routine.

TrySend(chID, msg) is a nonblocking call that returns false if the channel's queue is full.

Send() and TrySend() are also exposed for each Peer.

Peer

Each peer has one MConnection instance, and includes other information such as whether the connection was outbound, whether the connection should be recreated if it closes, various identity information about the node, and other higher level thread-safe data used by the reactors.

Switch/Reactor

The Switch handles peer connections and exposes an API to receive incoming messages on Reactors. Each Reactor is responsible for handling incoming messages of one or more Channels. So while sending outgoing messages is typically performed on the peer, incoming messages are received on the reactor.

// Declare a MyReactor reactor that handles messages on MyChannelID.
type MyReactor struct{}

func (reactor MyReactor) GetChannels() []*ChannelDescriptor {
    return []*ChannelDescriptor{ChannelDescriptor{ID:MyChannelID, Priority: 1}}
}

func (reactor MyReactor) Receive(chID byte, peer *Peer, msgBytes []byte) {
    r, n, err := bytes.NewBuffer(msgBytes), new(int64), new(error)
    msgString := ReadString(r, n, err)
    fmt.Println(msgString)
}

// Other Reactor methods omitted for brevity
...

switch := NewSwitch([]Reactor{MyReactor{}})

...

// Send a random message to all outbound connections
for _, peer := range switch.Peers().List() {
    if peer.IsOutbound() {
        peer.Send(MyChannelID, "Here's a random message")
    }
}
PexReactor/AddrBook

A PEXReactor reactor implementation is provided to automate peer discovery.

book := p2p.NewAddrBook(addrBookFilePath)
pexReactor := p2p.NewPEXReactor(book)
...
switch := NewSwitch([]Reactor{pexReactor, myReactor, ...})

Documentation

Overview

Uses nacl's secret_box to encrypt a net.Conn. It is (meant to be) an implementation of the STS protocol. Note we do not (yet) assume that a remote peer's pubkey is known ahead of time, and thus we are technically still vulnerable to MITM. (TODO!) See docs/sts-final.pdf for more info

Index

Constants

View Source 
const (
	// FuzzModeDrop is a mode in which we randomly drop reads/writes, connections or sleep
	FuzzModeDrop = iota
	// FuzzModeDelay is a mode in which we randomly sleep
	FuzzModeDelay
)
View Source 
const (
	// PexChannel is a channel for PEX messages
	PexChannel = byte(0x00)
)
View Source 
const Version = "0.5.0"

Variables

View Source 
var AllSeeds []string
View Source 
var (
	ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
)

Functions

func Connect2Switches 

func Connect2Switches(switches []*Switch, i, j int)

Connect2Switches will connect switches i and j via net.Pipe(). Blocks until a connection is established. NOTE: caller ensures i and j are within bounds.

func DelLocalAddress 

func DelLocalAddress(addrs []string) []string

DelLocalAddress delete local addr from adds

func FuzzConn 

func FuzzConn(conn net.Conn) net.Conn

FuzzConn creates a new FuzzedConnection. Fuzzing starts immediately.

func FuzzConnAfter 

func FuzzConnAfter(conn net.Conn, d time.Duration) net.Conn

FuzzConnAfter creates a new FuzzedConnection. Fuzzing starts when the duration elapses.

func FuzzConnAfterFromConfig 

func FuzzConnAfterFromConfig(conn net.Conn, d time.Duration, config *FuzzConnConfig) net.Conn

FuzzConnAfterFromConfig creates a new FuzzedConnection from a config. Fuzzing starts when the duration elapses.

func FuzzConnFromConfig 

func FuzzConnFromConfig(conn net.Conn, config *FuzzConnConfig) net.Conn

FuzzConnFromConfig creates a new FuzzedConnection from a config. Fuzzing starts immediately.

func GetLocalAllAddress 

func GetLocalAllAddress() []string

get all of local address

func StartSwitches 

func StartSwitches(switches []*Switch) error

StartSwitches calls sw.Start() for each given switch. It returns the first encountered error.

Types

type AddrBook 

type AddrBook struct {
	cmn.BaseService
	// contains filtered or unexported fields
}

AddrBook - concurrency safe peer address manager.

func NewAddrBook 

func NewAddrBook(filePath string, routabilityStrict bool) *AddrBook

NewAddrBook creates a new address book. Use Start to begin processing asynchronous address updates.

func (*AddrBook) AddAddress 

func (a *AddrBook) AddAddress(addr *NetAddress, src *NetAddress) error

AddAddress adds the given address as received from the given source. NOTE: addr must not be nil

func (*AddrBook) AddOurAddress 

func (a *AddrBook) AddOurAddress(addr *NetAddress)

AddOurAddress adds another one of our addresses.

func (*AddrBook) GetAllAddrs 

func (a *AddrBook) GetAllAddrs() []string

func (*AddrBook) GetSelection 

func (a *AddrBook) GetSelection() []*NetAddress

GetSelection randomly selects some addresses (old & new). Suitable for peer-exchange protocols.

func (*AddrBook) MarkAttempt 

func (a *AddrBook) MarkAttempt(addr *NetAddress)

MarkAttempt marks that an attempt was made to connect to the address.

func (*AddrBook) MarkBad 

func (a *AddrBook) MarkBad(addr *NetAddress)

MarkBad currently just ejects the address. In the future, consider blacklisting.

func (*AddrBook) MarkGood 

func (a *AddrBook) MarkGood(addr *NetAddress)

MarkGood marks the peer as good and moves it into an "old" bucket. XXX: we never call this!

func (*AddrBook) NeedMoreAddrs 

func (a *AddrBook) NeedMoreAddrs() bool

NeedMoreAddrs returns true if there are not have enough addresses in the book.

func (*AddrBook) OnStart 

func (a *AddrBook) OnStart() error

OnStart implements Service.

func (*AddrBook) OnStop 

func (a *AddrBook) OnStop()

OnStop implements Service.

func (*AddrBook) OurAddresses 

func (a *AddrBook) OurAddresses() []*NetAddress

OurAddresses returns a list of our addresses.

func (*AddrBook) PickAddress 

func (a *AddrBook) PickAddress(newBias int) *NetAddress

PickAddress picks an address to connect to. The address is picked randomly from an old or new bucket according to the newBias argument, which must be between [0, 100] (or else is truncated to that range) and determines how biased we are to pick an address from a new bucket. PickAddress returns nil if the AddrBook is empty or if we try to pick from an empty bucket.

func (*AddrBook) RemoveAddress 

func (a *AddrBook) RemoveAddress(addr *NetAddress)

RemoveAddress removes the address from the book.

func (*AddrBook) Save 

func (a *AddrBook) Save()

Save saves the book.

func (*AddrBook) Size 

func (a *AddrBook) Size() int

Size returns the number of addresses in the book.

func (*AddrBook) Wait 

func (a *AddrBook) Wait()

type BaseReactor 

type BaseReactor struct {
	cmn.BaseService // Provides Start, Stop, .Quit
	Switch          *Switch
}

func NewBaseReactor 

func NewBaseReactor(name string, impl Reactor) *BaseReactor

func (*BaseReactor) AddPeer 

func (_ *BaseReactor) AddPeer(peer Peer)

func (*BaseReactor) GetChannels 

func (_ *BaseReactor) GetChannels() []*ChannelDescriptor

func (*BaseReactor) Receive 

func (_ *BaseReactor) Receive(chID byte, peer Peer, msgBytes []byte)

func (*BaseReactor) RemovePeer 

func (_ *BaseReactor) RemovePeer(peer Peer, reason interface{})

func (*BaseReactor) SetSwitch 

func (br *BaseReactor) SetSwitch(sw *Switch)

type Channel 

type Channel struct {
	Logger log.Logger
	// contains filtered or unexported fields
}

TODO: lowercase. NOTE: not goroutine-safe.

func (*Channel) SetLogger 

func (ch *Channel) SetLogger(l log.Logger)

type ChannelDescriptor 

type ChannelDescriptor struct {
	ID                  byte
	Priority            int
	SendQueueCapacity   int
	RecvBufferCapacity  int
	RecvMessageCapacity int
}

func (ChannelDescriptor) FillDefaults 

func (chDesc ChannelDescriptor) FillDefaults() (filled ChannelDescriptor)

type ChannelStatus 

type ChannelStatus struct {
	ID                byte
	SendQueueCapacity int
	SendQueueSize     int
	Priority          int
	RecentlySent      int64
}

type ConnectionStatus 

type ConnectionStatus struct {
	SendMonitor flow.Status
	RecvMonitor flow.Status
	Channels    []ChannelStatus
}

type DefaultListener 

type DefaultListener struct {
	cmn.BaseService
	// contains filtered or unexported fields
}

Implements Listener

func (*DefaultListener) Connections 

func (l *DefaultListener) Connections() <-chan net.Conn

A channel of inbound connections. It gets closed when the listener closes.

func (*DefaultListener) ExternalAddress 

func (l *DefaultListener) ExternalAddress() *NetAddress

func (*DefaultListener) InternalAddress 

func (l *DefaultListener) InternalAddress() *NetAddress

func (*DefaultListener) NetListener 

func (l *DefaultListener) NetListener() net.Listener

NOTE: The returned listener is already Accept()'ing. So it's not suitable to pass into http.Serve().

func (*DefaultListener) OnStart 

func (l *DefaultListener) OnStart() error

func (*DefaultListener) OnStop 

func (l *DefaultListener) OnStop()

func (*DefaultListener) String 

func (l *DefaultListener) String() string

type FuzzConnConfig 

type FuzzConnConfig struct {
	Mode         int
	MaxDelay     time.Duration
	ProbDropRW   float64
	ProbDropConn float64
	ProbSleep    float64
}

FuzzConnConfig is a FuzzedConnection configuration.

func DefaultFuzzConnConfig 

func DefaultFuzzConnConfig() *FuzzConnConfig

DefaultFuzzConnConfig returns the default config.

type FuzzedConnection 

type FuzzedConnection struct {
	// contains filtered or unexported fields
}

FuzzedConnection wraps any net.Conn and depending on the mode either delays reads/writes or randomly drops reads/writes/connections.

func (*FuzzedConnection) Close 

func (fc *FuzzedConnection) Close() error

Close implements net.Conn.

func (*FuzzedConnection) Config 

func (fc *FuzzedConnection) Config() *FuzzConnConfig

Config returns the connection's config.

func (*FuzzedConnection) LocalAddr 

func (fc *FuzzedConnection) LocalAddr() net.Addr

LocalAddr implements net.Conn.

func (*FuzzedConnection) Read 

func (fc *FuzzedConnection) Read(data []byte) (n int, err error)

Read implements net.Conn.

func (*FuzzedConnection) RemoteAddr 

func (fc *FuzzedConnection) RemoteAddr() net.Addr

RemoteAddr implements net.Conn.

func (*FuzzedConnection) SetDeadline 

func (fc *FuzzedConnection) SetDeadline(t time.Time) error

SetDeadline implements net.Conn.

func (*FuzzedConnection) SetReadDeadline 

func (fc *FuzzedConnection) SetReadDeadline(t time.Time) error

SetReadDeadline implements net.Conn.

func (*FuzzedConnection) SetWriteDeadline 

func (fc *FuzzedConnection) SetWriteDeadline(t time.Time) error

SetWriteDeadline implements net.Conn.

func (*FuzzedConnection) Write 

func (fc *FuzzedConnection) Write(data []byte) (n int, err error)

Write implements net.Conn.

type IPeerSet 

type IPeerSet interface {
	Has(key string) bool
	Get(key string) Peer
	List() []Peer
	Size() int
}

IPeerSet has a (immutable) subset of the methods of PeerSet.

type Listener 

type Listener interface {
	Connections() <-chan net.Conn
	InternalAddress() *NetAddress
	ExternalAddress() *NetAddress
	String() string
	Stop() error
}

func NewDefaultListener 

func NewDefaultListener(protocol string, lAddr string, skipUPNP bool, logger log.Logger) Listener

skipUPNP: If true, does not try getUPNPExternalAddress()

type MConnConfig 

type MConnConfig struct {
	SendRate int64 `mapstructure:"send_rate"`
	RecvRate int64 `mapstructure:"recv_rate"`

	// Interval to send pings
	PingInterval time.Duration

	// Maximum wait time for pongs
	PongTimeout time.Duration
	// contains filtered or unexported fields
}

MConnConfig is a MConnection configuration.

func DefaultMConnConfig 

func DefaultMConnConfig() *MConnConfig

DefaultMConnConfig returns the default config.

type MConnection 

type MConnection struct {
	cmn.BaseService

	LocalAddress  *NetAddress
	RemoteAddress *NetAddress
	// contains filtered or unexported fields
}

Each peer has one `MConnection` (multiplex connection) instance.

__multiplex__ *noun* a system or signal involving simultaneous transmission of several messages along a single channel of communication.

Each `MConnection` handles message transmission on multiple abstract communication `Channel`s. Each channel has a globally unique byte id. The byte id and the relative priorities of each `Channel` are configured upon initialization of the connection.

There are two methods for sending messages: 

func (m MConnection) Send(chID byte, msg interface{}) bool {}
func (m MConnection) TrySend(chID byte, msg interface{}) bool {}

`Send(chID, msg)` is a blocking call that waits until `msg` is successfully queued for the channel with the given id byte `chID`, or until the request times out. The message `msg` is serialized using the `tendermint/wire` submodule's `WriteBinary()` reflection routine.

`TrySend(chID, msg)` is a nonblocking call that returns false if the channel's queue is full.

Inbound message bytes are handled with an onReceive callback function.

func NewMConnection 

func NewMConnection(conn net.Conn, chDescs []*ChannelDescriptor, onReceive receiveCbFunc, onError errorCbFunc) *MConnection

NewMConnection wraps net.Conn and creates multiplex connection

func NewMConnectionWithConfig 

func NewMConnectionWithConfig(conn net.Conn, chDescs []*ChannelDescriptor, onReceive receiveCbFunc, onError errorCbFunc, config *MConnConfig) *MConnection

NewMConnectionWithConfig wraps net.Conn and creates multiplex connection with a config

func (*MConnection) CanSend 

func (c *MConnection) CanSend(chID byte) bool

CanSend returns true if you can send more data onto the chID, false otherwise. Use only as a heuristic.

func (*MConnection) OnStart 

func (c *MConnection) OnStart() error

OnStart implements BaseService

func (*MConnection) OnStop 

func (c *MConnection) OnStop()

OnStop implements BaseService

func (*MConnection) Send 

func (c *MConnection) Send(chID byte, msg interface{}) bool

Queues a message to be sent to channel.

func (*MConnection) SetLogger 

func (c *MConnection) SetLogger(l log.Logger)

func (*MConnection) Status 

func (c *MConnection) Status() ConnectionStatus

func (*MConnection) String 

func (c *MConnection) String() string

func (*MConnection) TrySend 

func (c *MConnection) TrySend(chID byte, msg interface{}) bool

Queues a message to be sent to channel. Nonblocking, returns true if successful.

type NetAddress 

type NetAddress struct {
	IP   net.IP
	Port uint16
	// contains filtered or unexported fields
}

NetAddress defines information about a peer on the network including its IP address, and port.

func NewNetAddress 

func NewNetAddress(addr net.Addr) *NetAddress

NewNetAddress returns a new NetAddress using the provided TCP address. When testing, other net.Addr (except TCP) will result in using 0.0.0.0:0. When normal run, other net.Addr (except TCP) will panic. TODO: socks proxies?

func NewNetAddressIPPort 

func NewNetAddressIPPort(ip net.IP, port uint16) *NetAddress

NewNetAddressIPPort returns a new NetAddress using the provided IP and port number.

func NewNetAddressString 

func NewNetAddressString(addr string) (*NetAddress, error)

NewNetAddressString returns a new NetAddress using the provided address in the form of "IP:Port". Also resolves the host if host is not an IP.

func NewNetAddressStrings 

func NewNetAddressStrings(addrs []string) ([]*NetAddress, []error)

NewNetAddressStrings returns an array of NetAddress'es build using the provided strings.

func (*NetAddress) Dial 

func (na *NetAddress) Dial() (net.Conn, error)

Dial calls net.Dial on the address.

func (*NetAddress) DialTimeout 

func (na *NetAddress) DialTimeout(timeout time.Duration) (net.Conn, error)

DialTimeout calls net.DialTimeout on the address.

func (*NetAddress) Equals 

func (na *NetAddress) Equals(other interface{}) bool

Equals reports whether na and other are the same addresses.

func (*NetAddress) Less 

func (na *NetAddress) Less(other interface{}) bool

func (*NetAddress) Local 

func (na *NetAddress) Local() bool

Local returns true if it is a local address.

func (*NetAddress) RFC1918 

func (na *NetAddress) RFC1918() bool

func (*NetAddress) RFC3849 

func (na *NetAddress) RFC3849() bool

func (*NetAddress) RFC3927 

func (na *NetAddress) RFC3927() bool

func (*NetAddress) RFC3964 

func (na *NetAddress) RFC3964() bool

func (*NetAddress) RFC4193 

func (na *NetAddress) RFC4193() bool

func (*NetAddress) RFC4380 

func (na *NetAddress) RFC4380() bool

func (*NetAddress) RFC4843 

func (na *NetAddress) RFC4843() bool

func (*NetAddress) RFC4862 

func (na *NetAddress) RFC4862() bool

func (*NetAddress) RFC6052 

func (na *NetAddress) RFC6052() bool

func (*NetAddress) RFC6145 

func (na *NetAddress) RFC6145() bool

func (*NetAddress) ReachabilityTo 

func (na *NetAddress) ReachabilityTo(o *NetAddress) int

ReachabilityTo checks whenever o can be reached from na.

func (*NetAddress) Routable 

func (na *NetAddress) Routable() bool

Routable returns true if the address is routable.

func (*NetAddress) String 

func (na *NetAddress) String() string

String representation.

func (*NetAddress) Valid 

func (na *NetAddress) Valid() bool

For IPv4 these are either a 0 or all bits set address. For IPv6 a zero address or one that matches the RFC3849 documentation address format.

type NodeInfo 

type NodeInfo struct {
	PubKey     crypto.PubKeyEd25519 `json:"pub_key"`
	Moniker    string               `json:"moniker"`
	Network    string               `json:"network"`
	RemoteAddr string               `json:"remote_addr"`
	ListenAddr string               `json:"listen_addr"`
	Version    string               `json:"version"` // major.minor.revision
	Other      []string             `json:"other"`   // other application specific data
	Type       string               `json:"type"`
	LocalAddrs []string             `json:"addrs"`
}

func (*NodeInfo) CompatibleWith 

func (info *NodeInfo) CompatibleWith(other *NodeInfo) error

CONTRACT: two nodes are compatible if the major/minor versions match and network match

func (*NodeInfo) ListenHost 

func (info *NodeInfo) ListenHost() string

func (*NodeInfo) ListenPort 

func (info *NodeInfo) ListenPort() int

func (NodeInfo) String 

func (info NodeInfo) String() string

type PEXReactor 

type PEXReactor struct {
	BaseReactor
	// contains filtered or unexported fields
}

PEXReactor handles PEX (peer exchange) and ensures that an adequate number of peers are connected to the switch.

It uses `AddrBook` (address book) to store `NetAddress`es of the peers.

## Preventing abuse

For now, it just limits the number of messages from one peer to `defaultMaxMsgCountByPeer` messages per `msgCountByPeerFlushInterval` (1000 msg/hour).

NOTE [2017-01-17]: 

Limiting is fine for now. Maybe down the road we want to keep track of the
quality of peer messages so if peerA keeps telling us about peers we can't
connect to then maybe we should care less about peerA. But I don't think
that kind of complexity is priority right now.

func NewPEXReactor 

func NewPEXReactor(b *AddrBook) *PEXReactor

NewPEXReactor creates new PEX reactor.

func (*PEXReactor) AddPeer 

func (r *PEXReactor) AddPeer(p Peer)

AddPeer implements Reactor by adding peer to the address book (if inbound) or by requesting more addresses (if outbound).

func (*PEXReactor) GetChannels 

func (r *PEXReactor) GetChannels() []*ChannelDescriptor

GetChannels implements Reactor

func (*PEXReactor) IncrementMsgCountForPeer 

func (r *PEXReactor) IncrementMsgCountForPeer(addr string)

Increment or initialize the msg count for the peer in the CMap

func (*PEXReactor) OnStart 

func (r *PEXReactor) OnStart() error

OnStart implements BaseService

func (*PEXReactor) OnStop 

func (r *PEXReactor) OnStop()

OnStop implements BaseService

func (*PEXReactor) ReachedMaxMsgCountForPeer 

func (r *PEXReactor) ReachedMaxMsgCountForPeer(addr string) bool

ReachedMaxMsgCountForPeer returns true if we received too many messages from peer with address `addr`. NOTE: assumes the value in the CMap is non-nil

func (*PEXReactor) Receive 

func (r *PEXReactor) Receive(chID byte, src Peer, msgBytes []byte)

Receive implements Reactor by handling incoming PEX messages.

func (*PEXReactor) RemovePeer 

func (r *PEXReactor) RemovePeer(p Peer, reason interface{})

RemovePeer implements Reactor.

func (*PEXReactor) RequestPEX 

func (r *PEXReactor) RequestPEX(p Peer)

RequestPEX asks peer for more addresses.

func (*PEXReactor) SendAddrs 

func (r *PEXReactor) SendAddrs(p Peer, addrs []*NetAddress)

SendAddrs sends addrs to the peer.

func (*PEXReactor) SetEnsurePeersPeriod 

func (r *PEXReactor) SetEnsurePeersPeriod(d time.Duration)

SetEnsurePeersPeriod sets period to ensure peers connected.

func (*PEXReactor) SetMaxMsgCountByPeer 

func (r *PEXReactor) SetMaxMsgCountByPeer(v uint16)

SetMaxMsgCountByPeer sets maximum messages one peer can send to us during 'msgCountByPeerFlushInterval'.

type Peer 

type Peer interface {
	cmn.Service
	QuitChan() <-chan struct{}

	Key() string
	IsOutbound() bool    // did we dial the peer
	IsPersistent() bool  // do we redial this peer when we disconnect
	NodeInfo() *NodeInfo // peer's info
	Status() ConnectionStatus

	Send(byte, interface{}) bool
	TrySend(byte, interface{}) bool

	Set(string, interface{})
	Get(string) interface{}

	GetAddrs() []string
	Type() string
}

Peer is an interface representing a peer connected on a reactor.

type PeerConfig 

type PeerConfig struct {
	AuthEnc bool `mapstructure:"auth_enc"` // authenticated encryption

	// times are in seconds
	HandshakeTimeout time.Duration `mapstructure:"handshake_timeout"`
	DialTimeout      time.Duration `mapstructure:"dial_timeout"`

	MConfig *MConnConfig `mapstructure:"connection"`

	Fuzz       bool            `mapstructure:"fuzz"` // fuzz connection (for testing)
	FuzzConfig *FuzzConnConfig `mapstructure:"fuzz_config"`
}

PeerConfig is a Peer configuration.

func DefaultPeerConfig 

func DefaultPeerConfig() *PeerConfig

DefaultPeerConfig returns the default config.

type PeerSet 

type PeerSet struct {
	// contains filtered or unexported fields
}

PeerSet is a special structure for keeping a table of peers. Iteration over the peers is super fast and thread-safe.

func NewPeerSet 

func NewPeerSet() *PeerSet

NewPeerSet creates a new peerSet with a list of initial capacity of 256 items.

func (*PeerSet) Add 

func (ps *PeerSet) Add(peer Peer) error

Add adds the peer to the PeerSet. It returns ErrSwitchDuplicatePeer if the peer is already present.

func (*PeerSet) Get 

func (ps *PeerSet) Get(peerKey string) Peer

Get looks up a peer by the provided peerKey.

func (*PeerSet) Has 

func (ps *PeerSet) Has(peerKey string) bool

Has returns true iff the PeerSet contains the peer referred to by this peerKey.

func (*PeerSet) List 

func (ps *PeerSet) List() []Peer

List returns the threadsafe list of peers.

func (*PeerSet) Remove 

func (ps *PeerSet) Remove(peer Peer)

Remove discards peer by its Key, if the peer was previously memoized.

func (*PeerSet) Size 

func (ps *PeerSet) Size() int

Size returns the number of unique items in the peerSet.

type PexMessage 

type PexMessage interface{}

PexMessage is a primary type for PEX messages. Underneath, it could contain either pexRequestMessage, or pexAddrsMessage messages.

func DecodeMessage 

func DecodeMessage(bz []byte) (msgType byte, msg PexMessage, err error)

DecodeMessage implements interface registered above.

type Reactor 

type Reactor interface {
	cmn.Service // Start, Stop

	SetSwitch(*Switch)
	GetChannels() []*ChannelDescriptor
	AddPeer(peer Peer)
	RemovePeer(peer Peer, reason interface{})
	Receive(chID byte, peer Peer, msgBytes []byte) // CONTRACT: msgBytes are not nil
}

type SecretConnection 

type SecretConnection struct {
	// contains filtered or unexported fields
}

Implements net.Conn

func MakeSecretConnection 

func MakeSecretConnection(conn io.ReadWriteCloser, locPrivKey crypto.PrivKeyEd25519) (*SecretConnection, error)

Performs handshake and returns a new authenticated SecretConnection. Returns nil if error in handshake. Caller should call conn.Close() See docs/sts-final.pdf for more information.

func (*SecretConnection) Close 

func (sc *SecretConnection) Close() error

Implements net.Conn

func (*SecretConnection) LocalAddr 

func (sc *SecretConnection) LocalAddr() net.Addr

func (*SecretConnection) Read 

func (sc *SecretConnection) Read(data []byte) (n int, err error)

CONTRACT: data smaller than dataMaxSize is read atomically.

func (*SecretConnection) RemoteAddr 

func (sc *SecretConnection) RemoteAddr() net.Addr

func (*SecretConnection) RemotePubKey 

func (sc *SecretConnection) RemotePubKey() crypto.PubKeyEd25519

Returns authenticated remote pubkey

func (*SecretConnection) SetDeadline 

func (sc *SecretConnection) SetDeadline(t time.Time) error

func (*SecretConnection) SetReadDeadline 

func (sc *SecretConnection) SetReadDeadline(t time.Time) error

func (*SecretConnection) SetWriteDeadline 

func (sc *SecretConnection) SetWriteDeadline(t time.Time) error

func (*SecretConnection) Write 

func (sc *SecretConnection) Write(data []byte) (n int, err error)

Writes encrypted frames of `sealedFrameSize` CONTRACT: data smaller than dataMaxSize is read atomically.

type Switch 

type Switch struct {
	cmn.BaseService
	// contains filtered or unexported fields
}

The `Switch` handles peer connections and exposes an API to receive incoming messages on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one or more `Channels`. So while sending outgoing messages is typically performed on the peer, incoming messages are received on the reactor.

func MakeConnectedSwitches 

func MakeConnectedSwitches(cfg *cfg.P2PConfig, n int, initSwitch func(int, *Switch) *Switch, connect func([]*Switch, int, int)) []*Switch

MakeConnectedSwitches returns n switches, connected according to the connect func. If connect==Connect2Switches, the switches will be fully connected. initSwitch defines how the i'th switch should be initialized (ie. with what reactors). NOTE: panics if any switch fails to start.

func NewSwitch 

func NewSwitch(config *cfg.P2PConfig) *Switch

func (*Switch) AddListener 

func (sw *Switch) AddListener(l Listener)

AddListener adds the given listener to the switch for listening to incoming peer connections. NOTE: Not goroutine safe.

func (*Switch) AddReactor 

func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor

AddReactor adds the given reactor to the switch. NOTE: Not goroutine safe.

func (*Switch) Broadcast 

func (sw *Switch) Broadcast(chID byte, msg interface{}) chan bool

Broadcast runs a go routine for each attempted send, which will block trying to send for defaultSendTimeoutSeconds. Returns a channel which receives success values for each attempted send (false if times out). NOTE: Broadcast uses goroutines, so order of broadcast may not be preserved. TODO: Something more intelligent.

func (*Switch) DialPeerWithAddress 

func (sw *Switch) DialPeerWithAddress(addr *NetAddress, persistent bool) (Peer, error)

DialPeerWithAddress dials the given peer and runs sw.addPeer if it connects successfully. If `persistent == true`, the switch will always try to reconnect to this peer if the connection ever fails.

func (*Switch) DialSeeds 

func (sw *Switch) DialSeeds(addrBook *AddrBook, seeds []string) error

DialSeeds dials a list of seeds asynchronously in random order.

func (*Switch) FilterConnByAddr 

func (sw *Switch) FilterConnByAddr(addr net.Addr) error

FilterConnByAddr returns an error if connecting to the given address is forbidden.

func (*Switch) FilterConnByPubKey 

func (sw *Switch) FilterConnByPubKey(pubkey crypto.PubKeyEd25519) error

FilterConnByPubKey returns an error if connecting to the given public key is forbidden.

func (*Switch) GetNumPeersByRole 

func (sw *Switch) GetNumPeersByRole() (int, int, int)

func (*Switch) HasAddr 

func (sw *Switch) HasAddr(addr string) bool

func (*Switch) IsDialing 

func (sw *Switch) IsDialing(addr *NetAddress) bool

IsDialing returns true if the switch is currently dialing the given address.

func (*Switch) IsListening 

func (sw *Switch) IsListening() bool

IsListening returns true if the switch has at least one listener. NOTE: Not goroutine safe.

func (*Switch) Listeners 

func (sw *Switch) Listeners() []Listener

Listeners returns the list of listeners the switch listens on. NOTE: Not goroutine safe.

func (*Switch) NodeInfo 

func (sw *Switch) NodeInfo() *NodeInfo

NodeInfo returns the switch's NodeInfo. NOTE: Not goroutine safe.

func (*Switch) NumPeers 

func (sw *Switch) NumPeers() (outbound, inbound, dialing int)

NumPeers returns the count of outbound/inbound and outbound-dialing peers.

func (*Switch) OnStart 

func (sw *Switch) OnStart() error

OnStart implements BaseService. It starts all the reactors, peers, and listeners.

func (*Switch) OnStop 

func (sw *Switch) OnStop()

OnStop implements BaseService. It stops all listeners, peers, and reactors.

func (*Switch) Peers 

func (sw *Switch) Peers() IPeerSet

Peers returns the set of peers that are connected to the switch.

func (*Switch) Reactor 

func (sw *Switch) Reactor(name string) Reactor

Reactor returns the reactor with the given name. NOTE: Not goroutine safe.

func (*Switch) Reactors 

func (sw *Switch) Reactors() map[string]Reactor

Reactors returns a map of reactors registered on the switch. NOTE: Not goroutine safe.

func (*Switch) SetAddrFilter 

func (sw *Switch) SetAddrFilter(f func(net.Addr) error)

SetAddrFilter sets the function for filtering connections by address.

func (*Switch) SetNodeInfo 

func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo)

SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes. NOTE: Not goroutine safe.

func (*Switch) SetNodePrivKey 

func (sw *Switch) SetNodePrivKey(nodePrivKey crypto.PrivKeyEd25519)

SetNodePrivKey sets the switch's private key for authenticated encryption. NOTE: Overwrites sw.nodeInfo.PubKey. NOTE: Not goroutine safe.

func (*Switch) SetPubKeyFilter 

func (sw *Switch) SetPubKeyFilter(f func(crypto.PubKeyEd25519) error)

SetPubKeyFilter sets the function for filtering connections by public key.

func (*Switch) StopPeerForError 

func (sw *Switch) StopPeerForError(peer Peer, reason interface{})

StopPeerForError disconnects from a peer due to external error. If the peer is persistent, it will attempt to reconnect. TODO: make record depending on reason.

func (*Switch) StopPeerGracefully 

func (sw *Switch) StopPeerGracefully(peer Peer)

StopPeerGracefully disconnects from a peer gracefully. TODO: handle graceful disconnects.

Source Files

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Taken from taipei-torrent.
 Taken from taipei-torrent.

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