53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
package p2p
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import "fmt"
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// Protocol represents a P2P subprotocol implementation.
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type Protocol struct {
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// Name should contain the official protocol name,
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// often a three-letter word.
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Name string
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// Version should contain the version number of the protocol.
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Version uint
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// Length should contain the number of message codes used
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// by the protocol.
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Length uint64
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// Run is called in a new groutine when the protocol has been
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// negotiated with a peer. It should read and write messages from
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// rw. The Payload for each message must be fully consumed.
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//
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// The peer connection is closed when Start returns. It should return
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// any protocol-level error (such as an I/O error) that is
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// encountered.
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Run func(peer *Peer, rw MsgReadWriter) error
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}
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func (p Protocol) cap() Cap {
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return Cap{p.Name, p.Version}
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}
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// Cap is the structure of a peer capability.
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type Cap struct {
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Name string
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Version uint
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}
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func (cap Cap) RlpData() interface{} {
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return []interface{}{cap.Name, cap.Version}
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}
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func (cap Cap) String() string {
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return fmt.Sprintf("%s/%d", cap.Name, cap.Version)
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}
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type capsByNameAndVersion []Cap
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func (cs capsByNameAndVersion) Len() int { return len(cs) }
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func (cs capsByNameAndVersion) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
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func (cs capsByNameAndVersion) Less(i, j int) bool {
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return cs[i].Name < cs[j].Name || (cs[i].Name == cs[j].Name && cs[i].Version < cs[j].Version)
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}
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