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164 lines
5.2 KiB
164 lines
5.2 KiB
package p2p
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import (
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"fmt"
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cmn "github.com/tendermint/tendermint/libs/common"
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"strings"
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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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// NodeInfo is the basic node information exchanged
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// between two peers during the Tendermint P2P handshake.
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type NodeInfo struct {
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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 []string `json:"other"` // other application specific data
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}
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// Validate checks the self-reported NodeInfo 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 NodeInfo) Validate() error {
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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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// Sanitize ASCII text fields.
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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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for i, s := range info.Other {
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if !cmn.IsASCIIText(s) || cmn.ASCIITrim(s) == "" {
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return fmt.Errorf("info.Other[%v] must be valid non-empty ASCII text without tabs, but got %v.", i, s)
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}
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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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// ensure ListenAddr is good
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_, err := NewNetAddressString(IDAddressString(info.ID, info.ListenAddr))
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return err
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}
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// CompatibleWith checks if two NodeInfo are compatible with eachother.
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// CONTRACT: two nodes are compatible if the major version matches and network match
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// and they have at least one channel in common.
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func (info NodeInfo) CompatibleWith(other NodeInfo) error {
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iMajor, iMinor, _, iErr := splitVersion(info.Version)
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oMajor, oMinor, _, oErr := splitVersion(other.Version)
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// if our own version number is not formatted right, we messed up
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if iErr != nil {
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return iErr
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}
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// version number must be formatted correctly ("x.x.x")
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if oErr != nil {
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return oErr
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}
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// major version must match
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if iMajor != oMajor {
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return fmt.Errorf("Peer is on a different major version. Got %v, expected %v", oMajor, iMajor)
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}
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// minor version can differ
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if iMinor != oMinor {
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// ok
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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 NodeInfo -
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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 NodeInfo) 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 NodeInfo
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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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func (info NodeInfo) String() string {
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return fmt.Sprintf("NodeInfo{id: %v, moniker: %v, network: %v [listen %v], version: %v (%v)}",
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info.ID, info.Moniker, info.Network, info.ListenAddr, info.Version, info.Other)
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}
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func splitVersion(version string) (string, string, string, error) {
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spl := strings.Split(version, ".")
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if len(spl) != 3 {
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return "", "", "", fmt.Errorf("Invalid version format %v", version)
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}
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return spl[0], spl[1], spl[2], nil
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}
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