p2p

package
v0.27.0-dev0 Latest Latest
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 Go to latest Published: Nov 28, 2018 License: Apache-2.0 Imports: 27 Imported by: 0

README

p2p

The p2p package provides an abstraction around peer-to-peer communication.

Docs:

  • Connection for details on how connections and multiplexing work
  • Peer for details on peer ID, handshakes, and peer exchange
  • Node for details about different types of nodes and how they should work
  • Pex for details on peer discovery and exchange
  • Config for details on some config option

Documentation

Index

Constants

View Source 
const IDByteLength = crypto.AddressSize

IDByteLength is the length of a crypto.Address. Currently only 20. TODO: support other length addresses ?

View Source 
const MetricsSubsystem = "p2p"
View Source 
const TEST_HOST = "localhost"

Variables

This section is empty.

Functions

func AddPeerToSwitch 

func AddPeerToSwitch(sw *Switch, peer Peer)

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 CreateRandomPeer 

func CreateRandomPeer(outbound bool) *peer

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 *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 *config.FuzzConnConfig) net.Conn

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

func IDAddressString 

func IDAddressString(id ID, protocolHostPort string) string

IDAddressString returns id@hostPort. It strips the leading protocol from protocolHostPort if it exists.

func MConnConfig 

func MConnConfig(cfg *config.P2PConfig) conn.MConnConfig

MConnConfig returns an MConnConfig with fields updated from the P2PConfig.

func MakePoWTarget 

func MakePoWTarget(difficulty, targetBits uint) []byte

MakePoWTarget returns the big-endian encoding of 2^(targetBits - difficulty) - 1. It can be used as a Proof of Work target. NOTE: targetBits must be a multiple of 8 and difficulty must be less than targetBits.

func MaxNodeInfoSize 

func MaxNodeInfoSize() int

Max size of the NodeInfo struct

func NewConnSet 

func NewConnSet() *connSet

NewConnSet returns a ConnSet implementation.

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 interface {
	AddAddress(addr *NetAddress, src *NetAddress) error
	AddOurAddress(*NetAddress)
	OurAddress(*NetAddress) bool
	MarkGood(*NetAddress)
	RemoveAddress(*NetAddress)
	HasAddress(*NetAddress) bool
	Save()
}

An AddrBook represents an address book from the pex package, which is used to store peer addresses.

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() []*conn.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 ChannelDescriptor 

type ChannelDescriptor = conn.ChannelDescriptor

type ConnFilterFunc 

type ConnFilterFunc func(ConnSet, net.Conn, []net.IP) error

ConnFilterFunc to be implemented by filter hooks after a new connection has been established. The set of exisiting connections is passed along together with all resolved IPs for the new connection.

func ConnDuplicateIPFilter 

func ConnDuplicateIPFilter() ConnFilterFunc

ConnDuplicateIPFilter resolves and keeps all ips for an incoming connection and refuses new ones if they come from a known ip.

type ConnSet 

type ConnSet interface {
	Has(net.Conn) bool
	HasIP(net.IP) bool
	Set(net.Conn, []net.IP)
	Remove(net.Conn)
}

ConnSet is a lookup table for connections and all their ips.

type ConnectionStatus 

type ConnectionStatus = conn.ConnectionStatus

type DefaultNodeInfo 

type DefaultNodeInfo struct {
	ProtocolVersion ProtocolVersion `json:"protocol_version"`

	// Authenticate
	// TODO: replace with NetAddress
	ID_        ID     `json:"id"`          // authenticated identifier
	ListenAddr string `json:"listen_addr"` // accepting incoming

	// Check compatibility.
	// Channels are HexBytes so easier to read as JSON
	Network  string       `json:"network"`  // network/chain ID
	Version  string       `json:"version"`  // major.minor.revision
	Channels cmn.HexBytes `json:"channels"` // channels this node knows about

	// ASCIIText fields
	Moniker string               `json:"moniker"` // arbitrary moniker
	Other   DefaultNodeInfoOther `json:"other"`   // other application specific data
}

DefaultNodeInfo is the basic node information exchanged between two peers during the Tendermint P2P handshake.

func (DefaultNodeInfo) CompatibleWith 

func (info DefaultNodeInfo) CompatibleWith(other_ NodeInfo) error

CompatibleWith checks if two DefaultNodeInfo are compatible with eachother. CONTRACT: two nodes are compatible if the Block version and network match and they have at least one channel in common.

func (DefaultNodeInfo) ID 

func (info DefaultNodeInfo) ID() ID

ID returns the node's peer ID.

func (*DefaultNodeInfo) Marshal 

func (info *DefaultNodeInfo) Marshal() ([]byte, error)

Marshal returns the amino encoding.

func (*DefaultNodeInfo) MarshalTo 

func (info *DefaultNodeInfo) MarshalTo(data []byte) (int, error)

MarshalTo calls Marshal and copies to the given buffer.

func (DefaultNodeInfo) NetAddress 

func (info DefaultNodeInfo) NetAddress() *NetAddress

NetAddress returns a NetAddress derived from the DefaultNodeInfo - it includes the authenticated peer ID and the self-reported ListenAddr. Note that the ListenAddr is not authenticated and may not match that address actually dialed if its an outbound peer.

func (*DefaultNodeInfo) Size 

func (info *DefaultNodeInfo) Size() int

Size returns the size of the amino encoding, in bytes.

func (*DefaultNodeInfo) Unmarshal 

func (info *DefaultNodeInfo) Unmarshal(bs []byte) error

Unmarshal deserializes from amino encoded form.

func (DefaultNodeInfo) ValidateBasic added in v0.26.0 

func (info DefaultNodeInfo) ValidateBasic() error

ValidateBasic checks the self-reported DefaultNodeInfo is safe. It returns an error if there are too many Channels, if there are any duplicate Channels, if the ListenAddr is malformed, or if the ListenAddr is a host name that can not be resolved to some IP. TODO: constraints for Moniker/Other? Or is that for the UI ? JAE: It needs to be done on the client, but to prevent ambiguous unicode characters, maybe it's worth sanitizing it here. In the future we might want to validate these, once we have a name-resolution system up. International clients could then use punycode (or we could use url-encoding), and we just need to be careful with how we handle that in our clients. (e.g. off by default).

type DefaultNodeInfoOther 

type DefaultNodeInfoOther struct {
	TxIndex    string `json:"tx_index"`
	RPCAddress string `json:"rpc_address"`
}

DefaultNodeInfoOther is the misc. applcation specific data

type ErrFilterTimeout 

type ErrFilterTimeout struct{}

ErrFilterTimeout indicates that a filter operation timed out.

func (ErrFilterTimeout) Error 

func (e ErrFilterTimeout) Error() string

type ErrNetAddressInvalid 

type ErrNetAddressInvalid struct {
	Addr string
	Err  error
}

func (ErrNetAddressInvalid) Error 

func (e ErrNetAddressInvalid) Error() string

type ErrNetAddressLookup 

type ErrNetAddressLookup struct {
	Addr string
	Err  error
}

func (ErrNetAddressLookup) Error 

func (e ErrNetAddressLookup) Error() string

type ErrNetAddressNoID 

type ErrNetAddressNoID struct {
	Addr string
}

func (ErrNetAddressNoID) Error 

func (e ErrNetAddressNoID) Error() string

type ErrRejected 

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

ErrRejected indicates that a Peer was rejected carrying additional information as to the reason.

func (ErrRejected) Addr 

func (e ErrRejected) Addr() NetAddress

Addr returns the NetAddress for the rejected Peer.

func (ErrRejected) Error 

func (e ErrRejected) Error() string

func (ErrRejected) IsAuthFailure 

func (e ErrRejected) IsAuthFailure() bool

IsAuthFailure when Peer authentication was unsuccessful.

func (ErrRejected) IsDuplicate 

func (e ErrRejected) IsDuplicate() bool

IsDuplicate when Peer ID or IP are present already.

func (ErrRejected) IsFiltered 

func (e ErrRejected) IsFiltered() bool

IsFiltered when Peer ID or IP was filtered.

func (ErrRejected) IsIncompatible 

func (e ErrRejected) IsIncompatible() bool

IsIncompatible when Peer NodeInfo is not compatible with our own.

func (ErrRejected) IsNodeInfoInvalid 

func (e ErrRejected) IsNodeInfoInvalid() bool

IsNodeInfoInvalid when the sent NodeInfo is not valid.

func (ErrRejected) IsSelf 

func (e ErrRejected) IsSelf() bool

IsSelf when Peer is our own node.

type ErrSwitchAuthenticationFailure 

type ErrSwitchAuthenticationFailure struct {
	Dialed *NetAddress
	Got    ID
}

func (ErrSwitchAuthenticationFailure) Error 

func (e ErrSwitchAuthenticationFailure) Error() string

type ErrSwitchConnectToSelf 

type ErrSwitchConnectToSelf struct {
	Addr *NetAddress
}

ErrSwitchConnectToSelf to be raised when trying to connect to itself.

func (ErrSwitchConnectToSelf) Error 

func (e ErrSwitchConnectToSelf) Error() string

type ErrSwitchDuplicatePeerID 

type ErrSwitchDuplicatePeerID struct {
	ID ID
}

ErrSwitchDuplicatePeerID to be raised when a peer is connecting with a known ID.

func (ErrSwitchDuplicatePeerID) Error 

func (e ErrSwitchDuplicatePeerID) Error() string

type ErrSwitchDuplicatePeerIP 

type ErrSwitchDuplicatePeerIP struct {
	IP net.IP
}

ErrSwitchDuplicatePeerIP to be raised whena a peer is connecting with a known IP.

func (ErrSwitchDuplicatePeerIP) Error 

func (e ErrSwitchDuplicatePeerIP) Error() string

type ErrTransportClosed 

type ErrTransportClosed struct{}

ErrTransportClosed is raised when the Transport has been closed.

func (ErrTransportClosed) Error 

func (e ErrTransportClosed) Error() string

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() *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 ID 

type ID string

ID is a hex-encoded crypto.Address

func PubKeyToID 

func PubKeyToID(pubKey crypto.PubKey) ID

PubKeyToID returns the ID corresponding to the given PubKey. It's the hex-encoding of the pubKey.Address().

type IPResolver 

type IPResolver interface {
	LookupIPAddr(context.Context, string) ([]net.IPAddr, error)
}

IPResolver is a behaviour subset of net.Resolver.

type IPeerSet 

type IPeerSet interface {
	Has(key ID) bool
	HasIP(ip net.IP) bool
	Get(key ID) Peer
	List() []Peer
	Size() int
}

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

type Metrics 

type Metrics struct {
	// Number of peers.
	Peers metrics.Gauge
	// Number of bytes received from a given peer.
	PeerReceiveBytesTotal metrics.Counter
	// Number of bytes sent to a given peer.
	PeerSendBytesTotal metrics.Counter
	// Pending bytes to be sent to a given peer.
	PeerPendingSendBytes metrics.Gauge
	// Number of transactions submitted by each peer.
	NumTxs metrics.Gauge
}

Metrics contains metrics exposed by this package.

func NopMetrics 

func NopMetrics() *Metrics

NopMetrics returns no-op Metrics.

func PrometheusMetrics 

func PrometheusMetrics(namespace string) *Metrics

PrometheusMetrics returns Metrics build using Prometheus client library.

type MultiplexTransport 

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

MultiplexTransport accepts and dials tcp connections and upgrades them to multiplexed peers.

func NewMultiplexTransport 

func NewMultiplexTransport(
	nodeInfo NodeInfo,
	nodeKey NodeKey,
	mConfig conn.MConnConfig,
) *MultiplexTransport

NewMultiplexTransport returns a tcp connected multiplexed peer.

func (*MultiplexTransport) Accept 

func (mt *MultiplexTransport) Accept(cfg peerConfig) (Peer, error)

Accept implements Transport.

func (*MultiplexTransport) Close 

func (mt *MultiplexTransport) Close() error

Close implements transportLifecycle.

func (*MultiplexTransport) Dial 

func (mt *MultiplexTransport) Dial(
	addr NetAddress,
	cfg peerConfig,
) (Peer, error)

Dial implements Transport.

func (*MultiplexTransport) Listen 

func (mt *MultiplexTransport) Listen(addr NetAddress) error

Listen implements transportLifecycle.

type MultiplexTransportOption 

type MultiplexTransportOption func(*MultiplexTransport)

MultiplexTransportOption sets an optional parameter on the MultiplexTransport.

func MultiplexTransportConnFilters 

func MultiplexTransportConnFilters(
	filters ...ConnFilterFunc,
) MultiplexTransportOption

MultiplexTransportConnFilters sets the filters for rejection new connections.

func MultiplexTransportFilterTimeout 

func MultiplexTransportFilterTimeout(
	timeout time.Duration,
) MultiplexTransportOption

MultiplexTransportFilterTimeout sets the timeout waited for filter calls to return.

func MultiplexTransportResolver 

func MultiplexTransportResolver(resolver IPResolver) MultiplexTransportOption

MultiplexTransportResolver sets the Resolver used for ip lokkups, defaults to net.DefaultResolver.

type NetAddress 

type NetAddress struct {
	ID   ID     `json:"id"`
	IP   net.IP `json:"ip"`
	Port uint16 `json:"port"`
	// contains filtered or unexported fields
}

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

func CreateRoutableAddr 

func CreateRoutableAddr() (addr string, netAddr *NetAddress)

func NewNetAddress 

func NewNetAddress(id ID, 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 "ID@IP:Port". Also resolves the host if host is not an IP. Errors are of type ErrNetAddressXxx where Xxx is in (NoID, Invalid, Lookup)

func NewNetAddressStringWithOptionalID 

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

NewNetAddressStringWithOptionalID returns a new NetAddress using the provided address in the form of "ID@IP:Port", where the ID is optional. 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) DialString 

func (na *NetAddress) DialString() string

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, including their ID, IP, and Port.

func (*NetAddress) HasID 

func (na *NetAddress) HasID() bool

HasID returns true if the address has an ID. NOTE: It does not check whether the ID is valid or not.

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) Same 

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

Same returns true is na has the same non-empty ID or DialString as other.

func (*NetAddress) String 

func (na *NetAddress) String() string

String representation: <ID>@<IP>:<PORT>

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 interface {
	// contains filtered or unexported methods
}

NodeInfo exposes basic info of a node and determines if we're compatible.

type NodeKey 

type NodeKey struct {
	PrivKey crypto.PrivKey `json:"priv_key"` // our priv key
}

NodeKey is the persistent peer key. It contains the nodes private key for authentication.

func LoadNodeKey 

func LoadNodeKey(filePath string) (*NodeKey, error)

func LoadOrGenNodeKey 

func LoadOrGenNodeKey(filePath string) (*NodeKey, error)

LoadOrGenNodeKey attempts to load the NodeKey from the given filePath. If the file does not exist, it generates and saves a new NodeKey.

func (*NodeKey) ID 

func (nodeKey *NodeKey) ID() ID

ID returns the peer's canonical ID - the hash of its public key.

func (*NodeKey) PubKey 

func (nodeKey *NodeKey) PubKey() crypto.PubKey

PubKey returns the peer's PubKey

type Peer 

type Peer interface {
	cmn.Service
	FlushStop()

	ID() ID           // peer's cryptographic ID
	RemoteIP() net.IP // remote IP of the connection

	IsOutbound() bool   // did we dial the peer
	IsPersistent() bool // do we redial this peer when we disconnect

	NodeInfo() NodeInfo // peer's info
	Status() tmconn.ConnectionStatus
	OriginalAddr() *NetAddress

	Send(byte, []byte) bool
	TrySend(byte, []byte) bool

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

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

type PeerFilterFunc 

type PeerFilterFunc func(IPeerSet, Peer) error

PeerFilterFunc to be implemented by filter hooks after a new Peer has been fully setup.

type PeerOption 

type PeerOption func(*peer)

func PeerMetrics 

func PeerMetrics(metrics *Metrics) PeerOption

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 an error carrying the reason, if the peer is already present.

func (*PeerSet) Get 

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

Get looks up a peer by the provided peerKey. Returns nil if peer is not found.

func (*PeerSet) Has 

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

Has returns true if the set contains the peer referred to by this peerKey, otherwise false.

func (*PeerSet) HasIP 

func (ps *PeerSet) HasIP(peerIP net.IP) bool

HasIP returns true if the set contains the peer referred to by this IP address, otherwise false.

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 ProtocolVersion 

type ProtocolVersion struct {
	P2P   version.Protocol `json:"p2p"`
	Block version.Protocol `json:"block"`
	App   version.Protocol `json:"app"`
}

ProtocolVersion contains the protocol versions for the software.

func NewProtocolVersion 

func NewProtocolVersion(p2p, block, app version.Protocol) ProtocolVersion

NewProtocolVersion returns a fully populated ProtocolVersion.

type Reactor 

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

	// SetSwitch allows setting a switch.
	SetSwitch(*Switch)

	// GetChannels returns the list of channel descriptors.
	GetChannels() []*conn.ChannelDescriptor

	// AddPeer is called by the switch when a new peer is added.
	AddPeer(peer Peer)

	// RemovePeer is called by the switch when the peer is stopped (due to error
	// or other reason).
	RemovePeer(peer Peer, reason interface{})

	// Receive is called when msgBytes is received from peer.
	//
	// NOTE reactor can not keep msgBytes around after Receive completes without
	// copying.
	//
	// CONTRACT: msgBytes are not nil.
	Receive(chID byte, peer Peer, msgBytes []byte)
}

type Switch 

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

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 *config.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 MakeSwitch 

func MakeSwitch(
	cfg *config.P2PConfig,
	i int,
	network, version string,
	initSwitch func(int, *Switch) *Switch,
	opts ...SwitchOption,
) *Switch

func NewSwitch 

func NewSwitch(
	cfg *config.P2PConfig,
	transport Transport,
	options ...SwitchOption,
) *Switch

NewSwitch creates a new Switch with the given config.

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, msgBytes []byte) 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). Channel will be closed once msg bytes are sent to all peers (or time out).

NOTE: Broadcast uses goroutines, so order of broadcast may not be preserved.

func (*Switch) DialPeerWithAddress 

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

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

func (*Switch) DialPeersAsync 

func (sw *Switch) DialPeersAsync(addrBook AddrBook, peers []string, persistent bool) error

DialPeersAsync dials a list of peers asynchronously in random order (optionally, making them persistent). Used to dial peers from config on startup or from unsafe-RPC (trusted sources). TODO: remove addrBook arg since it's now set on the switch

func (*Switch) IsDialingOrExistingAddress 

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

IsDialingOrExistingAddress returns true if switch has a peer with the given address or dialing it at the moment.

func (*Switch) MarkPeerAsGood 

func (sw *Switch) MarkPeerAsGood(peer Peer)

MarkPeerAsGood marks the given peer as good when it did something useful like contributed to consensus.

func (*Switch) MaxNumOutboundPeers 

func (sw *Switch) MaxNumOutboundPeers() int

MaxNumOutboundPeers returns a maximum number of outbound peers.

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 and peers.

func (*Switch) OnStop 

func (sw *Switch) OnStop()

OnStop implements BaseService. It stops all 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) SetAddrBook 

func (sw *Switch) SetAddrBook(addrBook AddrBook)

SetAddrBook allows to set address book on Switch.

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) SetNodeKey 

func (sw *Switch) SetNodeKey(nodeKey *NodeKey)

SetNodeKey sets the switch's private key for authenticated encryption. NOTE: Not goroutine safe.

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.

type SwitchOption 

type SwitchOption func(*Switch)

SwitchOption sets an optional parameter on the Switch.

func SwitchFilterTimeout 

func SwitchFilterTimeout(timeout time.Duration) SwitchOption

SwitchFilterTimeout sets the timeout used for peer filters.

func SwitchPeerFilters 

func SwitchPeerFilters(filters ...PeerFilterFunc) SwitchOption

SwitchPeerFilters sets the filters for rejection of new peers.

func WithMetrics 

func WithMetrics(metrics *Metrics) SwitchOption

WithMetrics sets the metrics.

type Transport 

type Transport interface {
	// Accept returns a newly connected Peer.
	Accept(peerConfig) (Peer, error)

	// Dial connects to the Peer for the address.
	Dial(NetAddress, peerConfig) (Peer, error)
}

Transport emits and connects to Peers. The implementation of Peer is left to the transport. Each transport is also responsible to filter establishing peers specific to its domain.

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

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