//
// 确保Socket成功连接到后端服务器
//
func (bc *BackendConn) ensureConn() (transport thrift.TTransport, err error) {
// 1. 创建连接(只要IP没有问题， err一般就是空)
timeout := time.Second * 5
if strings.Contains(bc.addr, ":") {
transport, err = thrift.NewTSocketTimeout(bc.addr, timeout)
} else {
transport, err = rpc_utils.NewTUnixDomainTimeout(bc.addr, timeout)
}
log.Printf(Cyan("[%s]Create Socket To: %s"), bc.service, bc.addr)
if err != nil {
log.ErrorErrorf(err, "[%s]Create Socket Failed: %v, Addr: %s", err, bc.service, bc.addr)
// 连接不上，失败
return nil, err
}
// 2. 只要服务存在，一般不会出现err
sleepInterval := 1
err = transport.Open()
for err != nil && !bc.IsMarkOffline.Get() {
log.ErrorErrorf(err, "[%s]Socket Open Failed: %v, Addr: %s", bc.service, err, bc.addr)
// Sleep: 1, 2, 4这几个间隔
time.Sleep(time.Duration(sleepInterval) * time.Second)
if sleepInterval < 4 {
sleepInterval *= 2
}
err = transport.Open()
}
return transport, err
}
//
// 创建一个TFramedTranport, 支持: tcp socket，unix domain socket
// 1. tcp socket的格式: 60.29.255.199:5550
// 2. unix domain的格式: /usr/local/rpc_proxy/proxy.sock
//
func NewTFramedTransportWithTimeout(addr string, timeout time.Duration) (transport thrift.TTransport, err error) {
if strings.Contains(addr, ":") {
transport, err = thrift.NewTSocketTimeout(addr, timeout)
} else {
transport, err = NewTUnixDomainTimeout(addr, timeout)
}
return
}