P2P network

p2p is the network foundation of the blockchain. For a customizable blockchain framework, yu allows developers to freely use the functions of the P2P network, and developers can call it in ChainEnv. The underlying implementation of this interface comes from libp2p

Interface

Code is here ，the core functions are as follows：

    LocalID() peer.ID
    GetBootNodes() []peer.ID
    ConnectBootNodes() error

LocalID() returns local p2p ID
GetBootNodes() returns the p2p IDs of the bootnodes nodes in the p2p network, bootnodes are configured in the configuration file.
ConnectBootNodes() connects these bootnodes

    AddTopic(topicName string)
    PubP2P(topic string, msg []byte) error
    SubP2P(topic string) ([]byte, error)

AddTopic() adds a topic to the P2P network, which is used as a topic for subscription publishing.
PubP2P() publishes messages into the topic
SubP2P() subscribes messages from the topic

    RequestPeer(peerID peer.ID, code int, request []byte) (response []byte, err error)
    SetHandlers(handlers map[int]dev.P2pHandler)

RequestPeer() sends request data to a specific p2p node, code is the request category, which can be customized. (except 100 and 101, these two are predefined code of the framework, 100 is used when P2P node connection comparison data; 101 is used when synchronizing transaction data)
SetHandlers() is set to handle requests from the P2P network, each code corresponds to a handler, the interface of handler is here , developers can customize the logic here.