Error handling 在一个地方处理重复的错误案例
我正在编写一个函数,它将多个字段的结构写入TCP连接。有没有一种方法可以在一个地方处理错误,比如在Java中捕获异常 我的实现看起来像Error handling 在一个地方处理重复的错误案例,error-handling,go,Error Handling,Go,我正在编写一个函数,它将多个字段的结构写入TCP连接。有没有一种方法可以在一个地方处理错误,比如在Java中捕获异常 我的实现看起来像 func writeFrame(frame *Frame, conn net.Conn) error { bo := binary.BigEndian if err := binary.Write(conn, bo, frame.ype); err != nil { return err } if err := b
func writeFrame(frame *Frame, conn net.Conn) error {
bo := binary.BigEndian
if err := binary.Write(conn, bo, frame.ype); err != nil {
return err
}
if err := binary.Write(conn, bo, frame.id); err != nil {
return err
}
if err := binary.Write(conn, bo, frame.seq); err != nil {
return err
}
if err := binary.Write(conn, bo, uint32(len(frame.arg1))); err != nil {
return err
}
if err := binary.Write(conn, bo, uint32(len(frame.arg2))); err != nil {
return err
}
if err := binary.Write(conn, bo, uint32(len(frame.arg3))); err != nil {
return err
}
var csum uint32
if err := binary.Write(conn, bo, csum); err != nil {
return err
}
if _, err := conn.Write(frame.arg1); err != nil {
return err
}
if _, err := conn.Write(frame.arg2); err != nil {
return err
}
if _, err := conn.Write(frame.arg3); err != nil {
return err
}
return nil
}
您可以创建一个简单的类型来存储一堆写操作并一次执行它们,一旦遇到错误就立即执行
type MyWriter struct {
W io.Writer
O binary.ByteOrder
items []interface{}
}
func (w *MyWriter) AddWrite(value interface{}) {
w.items = append(w.items, value)
}
// PerformWrite executes all writes that have been added via AddWrite.
// It aborts as soon as an error is encountered and returns the error.
func (w *MyWriter) PerformWrites() error {
for _, item := range w.items {
if err := binary.Write(w.W, w.O, item); err != nil {
return err
}
}
return nil
}
有了它,您的writeFrame
函数可能看起来像这样:
func Write(conn net.Conn) error {
w := MyWriter{W: conn, O: binary.BigEndian}
// queue up your writes (frame.type, frame.id, ...)
w.AddWrite(int32(1))
w.AddWrite(int32(2))
w.AddWrite(int64(3))
if err := w.PerformWrites(); err != nil {
// there was an error
return err
}
return nil
}
你可以用a来做这个。如果发生任何错误,未来的Write将返回相同的错误并被忽略
func writeFrame(frame *Frame, conn net.Conn) error {
bo := binary.BigEndian
w := bufio.NewWriter(conn)
binary.Write(w, bo, frame.ype)
binary.Write(w, bo, frame.id)
binary.Write(w, bo, frame.seq)
binary.Write(w, bo, uint32(len(frame.arg1)))
binary.Write(w, bo, uint32(len(frame.arg2)))
binary.Write(w, bo, uint32(len(frame.arg3)))
var csum uint32
binary.Write(w, bo, csum)
w.Write(frame.arg1)
w.Write(frame.arg2)
w.Write(frame.arg3)
// Write outstanding data to conn and return an error if any occured
return w.Flush()
}
巧合的是,今天有一篇博文讨论了这一点: