func (c *Client) write(request *protobuf.Request) chan protobuf.Response {
data, err := proto.Marshal(request)
if err != nil {
log.Printf("Marshaling error: %v\n", err)
return nil
}
length := len(data)
lengthBytes := make([]byte, 4)
binary.BigEndian.PutUint32(lengthBytes, uint32(length))
// Guarantee squential write of length then protobuf on stream
c.connLock.Lock()
defer c.connLock.Unlock()
_, err = c.conn.Write(lengthBytes)
if err != nil {
log.Printf("Error writing data: %v\n", err)
return nil
}
_, err = c.conn.Write(data)
if err != nil {
log.Printf("Error writing data: %v\n", err)
return nil
}
callback := make(chan protobuf.Response)
c.pending[request.GetId()] = callback
return callback
}
