crypt_socket.py 文件源码

def receive(self, request=0, timeoutms=None):
        # receive into network buffer,
        # fill buffer once and decrypt
        # if request>0 wait blocking for request number of bytes (if timeout
        # given interrupt after timeoutms ms)
        # timeout==None: block
        # timeout==0: return immediately after trying to read something from
        #             network buffer
        # timeout>0: try for time specified to read something before returning
        #            this function always returns a pointer to the buffer and
        #            number of bytes read (could be 0)
        data = self.netbuf_in
        data_mv = self.netbuf_in_mv
        readbytes = 0
        start_t = ticks_ms()
        while readbytes < self.netbuf_size:
            try:
                if self.sock_read(data_mv[readbytes:readbytes+1]):
                    readbytes += 1 # result was not 0 or none
                else:
                    if readbytes >= request:
                        break  # break if not blocking to request size
            except OSError as e:
                if len(e.args) > 0 \
                        and (e.args[0] == errno.EAGAIN
                        or e.args[0] == errno.ETIMEDOUT):
                    if readbytes >= request:
                        break  # break if not blocking to request size
                else:
                    raise
            if timeoutms is not None \
                    and ticks_diff(ticks_ms(), start_t) >= timeoutms:
                break
            sleep_ms(1) # prevent busy waiting
        if readbytes>0: self.crypt_in.decrypt(data,length=readbytes)
        return data,readbytes