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client.go
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client.go
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package server
import (
"context"
"net"
"reflect"
)
type Client struct {
conn net.Conn
}
func NewClient(conn net.Conn) *Client {
return &Client{conn: conn}
}
func (c *Client) Call(ctx context.Context, name string, funcPtr interface{}) {
// 反射初始化 funcPtr 函数原型
fn := reflect.ValueOf(funcPtr).Elem()
// RPC 调用远程的函数
f := func(args []reflect.Value) []reflect.Value {
// 参数
inArgs := make([]interface{}, 0, len(args))
for _, arg := range args {
inArgs = append(inArgs, arg.Interface())
}
// 请求
requestRPCData := &RPCData{
Func: name,
Args: inArgs,
}
select {
case <-ctx.Done():
panic(ctx.Err())
return nil
default:
return handlerRequest(c.conn, &fn, requestRPCData)
}
}
// 将 RPC 调用函数赋给 fn
v := reflect.MakeFunc(fn.Type(), f)
fn.Set(v)
}
// 处理请求
func handlerRequest(conn net.Conn, fn *reflect.Value, requestRPCData *RPCData) []reflect.Value {
cliSession := NewSession(conn)
requestEncoded, err := encode(*requestRPCData)
if err != nil {
panic(err)
}
if err := cliSession.Write(requestEncoded); err != nil {
panic(err)
}
// 响应
response, err := cliSession.Read()
if err != nil {
panic(err)
}
respRPCData, err := decode(response)
if err != nil {
panic(err)
}
outArgs := make([]reflect.Value, 0, len(respRPCData.Args))
for i, arg := range respRPCData.Args {
if arg == nil {
outArgs = append(outArgs, reflect.Zero(fn.Type().Out(i)))
} else {
outArgs = append(outArgs, reflect.ValueOf(arg))
}
}
// 返回远程函数的返回值
return outArgs
}