package types import ( "errors" "fmt" "github.com/tendermint/tendermint/libs/bytes" tmstrings "github.com/tendermint/tendermint/libs/strings" tmp2p "github.com/tendermint/tendermint/proto/tendermint/p2p" ) const ( maxNodeInfoSize = 10240 // 10KB maxNumChannels = 16 // plenty of room for upgrades, for now ) // Max size of the NodeInfo struct func MaxNodeInfoSize() int { return maxNodeInfoSize } // ProtocolVersion contains the protocol versions for the software. type ProtocolVersion struct { P2P uint64 `json:"p2p"` Block uint64 `json:"block"` App uint64 `json:"app"` } //------------------------------------------------------------- // NodeInfo is the basic node information exchanged // between two peers during the Tendermint P2P handshake. type NodeInfo struct { ProtocolVersion ProtocolVersion `json:"protocol_version"` // Authenticate NodeID NodeID `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 // FIXME: This should be changed to uint16 to be consistent with the updated channel type Channels bytes.HexBytes `json:"channels"` // channels this node knows about // ASCIIText fields Moniker string `json:"moniker"` // arbitrary moniker Other NodeInfoOther `json:"other"` // other application specific data } // NodeInfoOther is the misc. applcation specific data type NodeInfoOther struct { TxIndex string `json:"tx_index"` RPCAddress string `json:"rpc_address"` } // ID returns the node's peer ID. func (info NodeInfo) ID() NodeID { return info.NodeID } // Validate checks the self-reported NodeInfo 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). func (info NodeInfo) Validate() error { // ID is already validated. // Validate ListenAddr. _, err := NewNetAddressString(info.ID().AddressString(info.ListenAddr)) if err != nil { return err } // Network is validated in CompatibleWith. // Validate Version if len(info.Version) > 0 && (!tmstrings.IsASCIIText(info.Version) || tmstrings.ASCIITrim(info.Version) == "") { return fmt.Errorf("info.Version must be valid ASCII text without tabs, but got %v", info.Version) } // Validate Channels - ensure max and check for duplicates. if len(info.Channels) > maxNumChannels { return fmt.Errorf("info.Channels is too long (%v). Max is %v", len(info.Channels), maxNumChannels) } channels := make(map[byte]struct{}) for _, ch := range info.Channels { _, ok := channels[ch] if ok { return fmt.Errorf("info.Channels contains duplicate channel id %v", ch) } channels[ch] = struct{}{} } // Validate Moniker. if !tmstrings.IsASCIIText(info.Moniker) || tmstrings.ASCIITrim(info.Moniker) == "" { return fmt.Errorf("info.Moniker must be valid non-empty ASCII text without tabs, but got %v", info.Moniker) } // Validate Other. other := info.Other txIndex := other.TxIndex switch txIndex { case "", "on", "off": default: return fmt.Errorf("info.Other.TxIndex should be either 'on', 'off', or empty string, got '%v'", txIndex) } // XXX: Should we be more strict about address formats? rpcAddr := other.RPCAddress if len(rpcAddr) > 0 && (!tmstrings.IsASCIIText(rpcAddr) || tmstrings.ASCIITrim(rpcAddr) == "") { return fmt.Errorf("info.Other.RPCAddress=%v must be valid ASCII text without tabs", rpcAddr) } return nil } // CompatibleWith checks if two NodeInfo are compatible with each other. // CONTRACT: two nodes are compatible if the Block version and network match // and they have at least one channel in common. func (info NodeInfo) CompatibleWith(other NodeInfo) error { if info.ProtocolVersion.Block != other.ProtocolVersion.Block { return fmt.Errorf("peer is on a different Block version. Got %v, expected %v", other.ProtocolVersion.Block, info.ProtocolVersion.Block) } // nodes must be on the same network if info.Network != other.Network { return fmt.Errorf("peer is on a different network. Got %v, expected %v", other.Network, info.Network) } // if we have no channels, we're just testing if len(info.Channels) == 0 { return nil } // for each of our channels, check if they have it found := false OUTER_LOOP: for _, ch1 := range info.Channels { for _, ch2 := range other.Channels { if ch1 == ch2 { found = true break OUTER_LOOP // only need one } } } if !found { return fmt.Errorf("peer has no common channels. Our channels: %v ; Peer channels: %v", info.Channels, other.Channels) } return nil } // NetAddress returns a NetAddress derived from the NodeInfo - // 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 (info NodeInfo) NetAddress() (*NetAddress, error) { idAddr := info.ID().AddressString(info.ListenAddr) return NewNetAddressString(idAddr) } // AddChannel is used by the router when a channel is opened to add it to the node info func (info *NodeInfo) AddChannel(channel uint16) { // check that the channel doesn't already exist for _, ch := range info.Channels { if ch == byte(channel) { return } } info.Channels = append(info.Channels, byte(channel)) } func (info NodeInfo) Copy() NodeInfo { return NodeInfo{ ProtocolVersion: info.ProtocolVersion, NodeID: info.NodeID, ListenAddr: info.ListenAddr, Network: info.Network, Version: info.Version, Channels: info.Channels, Moniker: info.Moniker, Other: info.Other, } } func (info NodeInfo) ToProto() *tmp2p.NodeInfo { dni := new(tmp2p.NodeInfo) dni.ProtocolVersion = tmp2p.ProtocolVersion{ P2P: info.ProtocolVersion.P2P, Block: info.ProtocolVersion.Block, App: info.ProtocolVersion.App, } dni.NodeID = string(info.NodeID) dni.ListenAddr = info.ListenAddr dni.Network = info.Network dni.Version = info.Version dni.Channels = info.Channels dni.Moniker = info.Moniker dni.Other = tmp2p.NodeInfoOther{ TxIndex: info.Other.TxIndex, RPCAddress: info.Other.RPCAddress, } return dni } func NodeInfoFromProto(pb *tmp2p.NodeInfo) (NodeInfo, error) { if pb == nil { return NodeInfo{}, errors.New("nil node info") } dni := NodeInfo{ ProtocolVersion: ProtocolVersion{ P2P: pb.ProtocolVersion.P2P, Block: pb.ProtocolVersion.Block, App: pb.ProtocolVersion.App, }, NodeID: NodeID(pb.NodeID), ListenAddr: pb.ListenAddr, Network: pb.Network, Version: pb.Version, Channels: pb.Channels, Moniker: pb.Moniker, Other: NodeInfoOther{ TxIndex: pb.Other.TxIndex, RPCAddress: pb.Other.RPCAddress, }, } return dni, nil }