关注点：RPC相关配置
一、RPC的所有配置项
源码文件：
tendermint/config/config.go
//-----------------------------------------------------------------------------
// RPCConfig
// RPCConfig defines the configuration options for the Tendermint RPC server
type RPCConfig struct {
RootDir string `mapstructure:"home"`
// TCP or UNIX socket address for the RPC server to listen on
ListenAddress string `mapstructure:"laddr"`
// TCP or UNIX socket address for the gRPC server to listen on
// NOTE: This server only supports /broadcast_tx_commit
GRPCListenAddress string `mapstructure:"grpc_laddr"`
// Maximum number of simultaneous connections.
// Does not include RPC (HTTP&WebSocket) connections. See max_open_connections
// If you want to accept more significant number than the default, make sure
// you increase your OS limits.
// 0 - unlimited.
GRPCMaxOpenConnections int `mapstructure:"grpc_max_open_connections"`
// Activate unsafe RPC commands like /dial_persistent_peers and /unsafe_flush_mempool
Unsafe bool `mapstructure:"unsafe"`
// Maximum number of simultaneous connections (including WebSocket).
// Does not include gRPC connections. See grpc_max_open_connections
// If you want to accept more significant number than the default, make sure
// you increase your OS limits.
// 0 - unlimited.
// Should be < {ulimit -Sn} - {MaxNumInboundPeers} - {MaxNumOutboundPeers} - {N of wal, db and other open files}
// 1024 - 40 - 10 - 50 = 924 = ~900
MaxOpenConnections int `mapstructure:"max_open_connections"`
}
第一次阅读这段配置代码，非常迷惑。慢慢看代码，基本上已经弄明白。究其原因，我认为源码中的配置项的排列顺序有一点问题，我们来试着优化一下，注释就不再拷贝了。
type RPCConfig struct {
RootDir string
Unsafe bool
ListenAddress string
GRPCListenAddress string
MaxOpenConnections int
GRPCMaxOpenConnections int
}
这样排列的话，就很容易理解了。Unsafe是针对ListenAddress和GRPCListenAddress都起作用的配置项。ListenAddress和GRPCListenAddress的关系一看就是完全对等的。既然这两种连接是对等的，那么MaxOpenConnections和GRPCMaxOpenConnections也应该是独立计数的。
从源码看出，ListenAddress在社区中称为RPC，支持两种协议，Http和Websocket，这两种协议可以共用一个端口，源于websockt与 HTTP 协议有着良好的兼容性，tendermint中使用一个特殊的路径来做区分，下面是部分源码
mux := http.NewServeMux()
wm := rpcserver.NewWebsocketManager(rpccore.Routes, coreCodec, rpcserver.EventSubscriber(n.eventBus))
wm.SetLogger(rpcLogger.With("protocol", "websocket"))
mux.HandleFunc("/websocket", wm.WebsocketHandler)
