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220 lines
6.8 KiB
220 lines
6.8 KiB
package p2p
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import (
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"fmt"
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"reflect"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/version"
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)
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const (
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maxNodeInfoSize = 10240 // 10Kb
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maxNumChannels = 16 // plenty of room for upgrades, for now
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)
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// Max size of the NodeInfo struct
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func MaxNodeInfoSize() int {
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return maxNodeInfoSize
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}
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//-------------------------------------------------------------
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// NodeInfo exposes basic info of a node
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// and determines if we're compatible.
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type NodeInfo interface {
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nodeInfoAddress
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nodeInfoTransport
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}
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// nodeInfoAddress exposes just the core info of a node.
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type nodeInfoAddress interface {
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ID() ID
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NetAddress() *NetAddress
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}
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// nodeInfoTransport validates a nodeInfo and checks
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// our compatibility with it. It's for use in the handshake.
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type nodeInfoTransport interface {
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ValidateBasic() error
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CompatibleWith(other NodeInfo) error
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}
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//-------------------------------------------------------------
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// ProtocolVersion contains the protocol versions for the software.
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type ProtocolVersion struct {
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P2P version.Protocol `json:"p2p"`
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Block version.Protocol `json:"block"`
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App version.Protocol `json:"app"`
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}
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var InitProtocolVersion = ProtocolVersion{
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P2P: version.P2PProtocol,
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Block: version.BlockProtocol,
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App: 0,
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}
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//-------------------------------------------------------------
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// Assert DefaultNodeInfo satisfies NodeInfo
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var _ NodeInfo = DefaultNodeInfo{}
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// DefaultNodeInfo is the basic node information exchanged
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// between two peers during the Tendermint P2P handshake.
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type DefaultNodeInfo struct {
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ProtocolVersion ProtocolVersion `json:"protocol_version"`
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// Authenticate
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// TODO: replace with NetAddress
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ID_ ID `json:"id"` // authenticated identifier
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ListenAddr string `json:"listen_addr"` // accepting incoming
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// Check compatibility.
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// Channels are HexBytes so easier to read as JSON
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Network string `json:"network"` // network/chain ID
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Version string `json:"version"` // major.minor.revision
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Channels cmn.HexBytes `json:"channels"` // channels this node knows about
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// ASCIIText fields
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Moniker string `json:"moniker"` // arbitrary moniker
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Other DefaultNodeInfoOther `json:"other"` // other application specific data
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}
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// DefaultNodeInfoOther is the misc. applcation specific data
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type DefaultNodeInfoOther struct {
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TxIndex string `json:"tx_index"`
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RPCAddress string `json:"rpc_address"`
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}
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// ID returns the node's peer ID.
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func (info DefaultNodeInfo) ID() ID {
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return info.ID_
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}
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// ValidateBasic checks the self-reported DefaultNodeInfo is safe.
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// It returns an error if there
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// are too many Channels, if there are any duplicate Channels,
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// if the ListenAddr is malformed, or if the ListenAddr is a host name
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// that can not be resolved to some IP.
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// TODO: constraints for Moniker/Other? Or is that for the UI ?
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// JAE: It needs to be done on the client, but to prevent ambiguous
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// unicode characters, maybe it's worth sanitizing it here.
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// In the future we might want to validate these, once we have a
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// name-resolution system up.
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// International clients could then use punycode (or we could use
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// url-encoding), and we just need to be careful with how we handle that in our
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// clients. (e.g. off by default).
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func (info DefaultNodeInfo) ValidateBasic() error {
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// ID is already validated.
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// Validate ListenAddr.
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_, err := NewNetAddressString(IDAddressString(info.ID(), info.ListenAddr))
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if err != nil {
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return err
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}
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// Network is validated in CompatibleWith.
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// Validate Version
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if len(info.Version) > 0 &&
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(!cmn.IsASCIIText(info.Version) || cmn.ASCIITrim(info.Version) == "") {
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return fmt.Errorf("info.Version must be valid ASCII text without tabs, but got %v", info.Version)
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}
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// Validate Channels - ensure max and check for duplicates.
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if len(info.Channels) > maxNumChannels {
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return fmt.Errorf("info.Channels is too long (%v). Max is %v", len(info.Channels), maxNumChannels)
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}
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channels := make(map[byte]struct{})
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for _, ch := range info.Channels {
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_, ok := channels[ch]
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if ok {
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return fmt.Errorf("info.Channels contains duplicate channel id %v", ch)
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}
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channels[ch] = struct{}{}
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}
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// Validate Moniker.
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if !cmn.IsASCIIText(info.Moniker) || cmn.ASCIITrim(info.Moniker) == "" {
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return fmt.Errorf("info.Moniker must be valid non-empty ASCII text without tabs, but got %v", info.Moniker)
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}
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// Validate Other.
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other := info.Other
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txIndex := other.TxIndex
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switch txIndex {
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case "", "on", "off":
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default:
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return fmt.Errorf("info.Other.TxIndex should be either 'on' or 'off', got '%v'", txIndex)
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}
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// XXX: Should we be more strict about address formats?
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rpcAddr := other.RPCAddress
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if len(rpcAddr) > 0 && (!cmn.IsASCIIText(rpcAddr) || cmn.ASCIITrim(rpcAddr) == "") {
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return fmt.Errorf("info.Other.RPCAddress=%v must be valid ASCII text without tabs", rpcAddr)
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}
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return nil
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}
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// CompatibleWith checks if two DefaultNodeInfo are compatible with eachother.
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// CONTRACT: two nodes are compatible if the Block version and network match
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// and they have at least one channel in common.
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func (info DefaultNodeInfo) CompatibleWith(other_ NodeInfo) error {
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other, ok := other_.(DefaultNodeInfo)
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if !ok {
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return fmt.Errorf("wrong NodeInfo type. Expected DefaultNodeInfo, got %v", reflect.TypeOf(other_))
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}
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if info.ProtocolVersion.Block != other.ProtocolVersion.Block {
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return fmt.Errorf("Peer is on a different Block version. Got %v, expected %v",
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other.ProtocolVersion.Block, info.ProtocolVersion.Block)
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}
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// nodes must be on the same network
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if info.Network != other.Network {
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return fmt.Errorf("Peer is on a different network. Got %v, expected %v", other.Network, info.Network)
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}
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// if we have no channels, we're just testing
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if len(info.Channels) == 0 {
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return nil
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}
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// for each of our channels, check if they have it
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found := false
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OUTER_LOOP:
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for _, ch1 := range info.Channels {
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for _, ch2 := range other.Channels {
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if ch1 == ch2 {
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found = true
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break OUTER_LOOP // only need one
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}
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}
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}
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if !found {
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return fmt.Errorf("Peer has no common channels. Our channels: %v ; Peer channels: %v", info.Channels, other.Channels)
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}
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return nil
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}
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// NetAddress returns a NetAddress derived from the DefaultNodeInfo -
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// it includes the authenticated peer ID and the self-reported
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// ListenAddr. Note that the ListenAddr is not authenticated and
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// may not match that address actually dialed if its an outbound peer.
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func (info DefaultNodeInfo) NetAddress() *NetAddress {
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netAddr, err := NewNetAddressString(IDAddressString(info.ID(), info.ListenAddr))
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if err != nil {
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switch err.(type) {
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case ErrNetAddressLookup:
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// XXX If the peer provided a host name and the lookup fails here
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// we're out of luck.
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// TODO: use a NetAddress in DefaultNodeInfo
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default:
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panic(err) // everything should be well formed by now
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}
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}
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return netAddr
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}
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