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|
package rpc
import (
"container/list"
"fmt"
"reflect"
"sync"
)
type Client struct {
sync.Mutex
network string
addr string
maxIdleConns int
conns *list.List
}
func NewClient(network, addr string, maxIdleConns int) *Client {
RegisterType(RpcError{})
c := new(Client)
c.network = network
c.addr = addr
c.maxIdleConns = maxIdleConns
c.conns = list.New()
return c
}
func (c *Client) Close() error {
c.Lock()
for {
if c.conns.Len() > 0 {
v := c.conns.Front()
co := v.Value.(*conn)
co.Close()
c.conns.Remove(v)
} else {
break
}
}
c.Unlock()
return nil
}
func (c *Client) MakeRpc(rpcName string, fptr interface{}) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("make rpc error")
}
}()
fn := reflect.ValueOf(fptr).Elem()
nOut := fn.Type().NumOut()
if nOut == 0 || fn.Type().Out(nOut-1).Kind() != reflect.Interface {
err = fmt.Errorf("%s return final output param must be error interface", rpcName)
return
}
_, b := fn.Type().Out(nOut - 1).MethodByName("Error")
if !b {
err = fmt.Errorf("%s return final output param must be error interface", rpcName)
return
}
f := func(in []reflect.Value) []reflect.Value {
return c.call(fn, rpcName, in)
}
v := reflect.MakeFunc(fn.Type(), f)
fn.Set(v)
return
}
func (c *Client) call(fn reflect.Value, name string, in []reflect.Value) []reflect.Value {
inArgs := make([]interface{}, len(in))
for i := 0; i < len(in); i++ {
inArgs[i] = in[i].Interface()
}
data, err := encodeData(name, inArgs)
if err != nil {
return c.returnCallError(fn, err)
}
var co *conn
var buf []byte
for i := 0; i < 3; i++ {
if co, err = c.popConn(); err != nil {
continue
}
buf, err = co.Call(data)
if err == nil {
c.pushConn(co)
break
} else {
co.Close()
}
}
if err != nil {
return c.returnCallError(fn, err)
}
n, out, e := decodeData(buf)
if e != nil {
return c.returnCallError(fn, e)
}
if n != name {
return c.returnCallError(fn, fmt.Errorf("rpc name %s != %s", n, name))
}
last := out[len(out)-1]
if last != nil {
if err, ok := last.(error); ok {
return c.returnCallError(fn, err)
} else {
return c.returnCallError(fn, fmt.Errorf("rpc final return type %T must be error", last))
}
}
outValues := make([]reflect.Value, len(out))
for i := 0; i < len(out); i++ {
if out[i] == nil {
outValues[i] = reflect.Zero(fn.Type().Out(i))
} else {
outValues[i] = reflect.ValueOf(out[i])
}
}
return outValues
}
func (c *Client) returnCallError(fn reflect.Value, err error) []reflect.Value {
nOut := fn.Type().NumOut()
out := make([]reflect.Value, nOut)
for i := 0; i < nOut-1; i++ {
out[i] = reflect.Zero(fn.Type().Out(i))
}
out[nOut-1] = reflect.ValueOf(&err).Elem()
return out
}
func (c *Client) popConn() (*conn, error) {
c.Lock()
if c.conns.Len() > 0 {
v := c.conns.Front()
c.conns.Remove(v)
c.Unlock()
return v.Value.(*conn), nil
}
c.Unlock()
return newConn(c.network, c.addr)
}
func (c *Client) pushConn(co *conn) error {
c.Lock()
if c.conns.Len() >= c.maxIdleConns {
c.Unlock()
co.Close()
return nil
} else {
c.conns.PushBack(co)
}
c.Unlock()
return nil
}
|
