recv
接受数据
客户端接受数据需要指定缓存区最大长度,就是下面的 buf_len
,flags
用于指定是否设置 waitall
标志,如果设定了 waitall
就必须设定准确的 size
,否则会一直等待,直到接收的数据长度达到 size
。
客户端启用了 EOF/Length
检测后,无需设置 size
和 waitall
参数。扩展层会返回完整的数据包或者返回false
。
开启了 open_eof_check
/open_length_check
选项之后,会自动进行包长检测,过程和服务端类似,此处不需要多说。
static PHP_METHOD(swoole_client, recv)
{
zend_long buf_len = SW_PHP_CLIENT_BUFFER_SIZE;
zend_long flags = 0;
int ret;
char *buf = NULL;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|ll", &buf_len, &flags) == FAILURE)
{
return;
}
//waitall
if (flags == 1)
{
flags = MSG_WAITALL;
}
swClient *cli = client_get_ptr(getThis() TSRMLS_CC);
swProtocol *protocol = &cli->protocol;
if (cli->open_eof_check)
{
if (cli->buffer == NULL)
{
cli->buffer = swString_new(SW_BUFFER_SIZE_BIG);
}
swString *buffer = cli->buffer;
int eof = -1;
if (buffer->length > 0)
{
goto find_eof;
}
while (1)
{
buf = buffer->str + buffer->length;
buf_len = buffer->size - buffer->length;
if (buf_len > SW_BUFFER_SIZE_BIG)
{
buf_len = SW_BUFFER_SIZE_BIG;
}
ret = cli->recv(cli, buf, buf_len, 0);
if (ret < 0)
{
swoole_php_error(E_WARNING, "recv() failed. Error: %s [%d]", strerror(errno), errno);
buffer->length = 0;
RETURN_FALSE;
}
else if (ret == 0)
{
buffer->length = 0;
RETURN_EMPTY_STRING();
}
buffer->length += ret;
if (buffer->length < protocol->package_eof_len)
{
continue;
}
find_eof: eof = swoole_strnpos(buffer->str, buffer->length, protocol->package_eof, protocol->package_eof_len);
if (eof >= 0)
{
eof += protocol->package_eof_len;
SW_RETVAL_STRINGL(buffer->str, eof, 1);
if (buffer->length > eof)
{
buffer->length -= eof;
memmove(buffer->str, buffer->str + eof, buffer->length);
}
else
{
buffer->length = 0;
}
return;
}
else
{
if (buffer->length == protocol->package_max_length)
{
swoole_php_error(E_WARNING, "no package eof");
buffer->length = 0;
RETURN_FALSE;
}
else if (buffer->length == buffer->size)
{
if (buffer->size < protocol->package_max_length)
{
int new_size = buffer->size * 2;
if (new_size > protocol->package_max_length)
{
new_size = protocol->package_max_length;
}
if (swString_extend(buffer, new_size) < 0)
{
buffer->length = 0;
RETURN_FALSE;
}
}
}
}
}
buffer->length = 0;
RETURN_FALSE;
}
else if (cli->open_length_check)
{
if (cli->buffer == NULL)
{
cli->buffer = swString_new(SW_BUFFER_SIZE_STD);
}
uint32_t header_len = protocol->package_length_offset + protocol->package_length_size;
ret = cli->recv(cli, cli->buffer->str, header_len, MSG_WAITALL);
if (ret <= 0)
{
goto check_return;
}
else if (ret != header_len)
{
ret = 0;
goto check_return;
}
buf_len = protocol->get_package_length(protocol, cli->socket, cli->buffer->str, ret);
//error package
if (buf_len < 0)
{
RETURN_EMPTY_STRING();
}
//empty package
else if (buf_len == header_len)
{
SW_RETURN_STRINGL(cli->buffer->str, header_len, 1);
}
else if (buf_len > protocol->package_max_length)
{
swoole_error_log(SW_LOG_WARNING, SW_ERROR_PACKAGE_LENGTH_TOO_LARGE, "Package is too big. package_length=%d", (int )buf_len);
RETURN_EMPTY_STRING();
}
buf = (char *) emalloc(buf_len + 1);
memcpy(buf, cli->buffer->str, header_len);
SwooleG.error = 0;
ret = cli->recv(cli, buf + header_len, buf_len - header_len, MSG_WAITALL);
if (ret > 0)
{
ret += header_len;
if (ret != buf_len)
{
ret = 0;
}
}
}
else
{
if (!(flags & MSG_WAITALL) && buf_len > SW_PHP_CLIENT_BUFFER_SIZE)
{
buf_len = SW_PHP_CLIENT_BUFFER_SIZE;
}
buf = (char *) emalloc(buf_len + 1);
SwooleG.error = 0;
ret = cli->recv(cli, buf, buf_len, flags);
}
check_return:
if (ret < 0)
{
SwooleG.error = errno;
swoole_php_error(E_WARNING, "recv() failed. Error: %s [%d]", strerror(SwooleG.error), SwooleG.error);
zend_update_property_long(swoole_client_class_entry_ptr, getThis(), SW_STRL("errCode")-1, SwooleG.error TSRMLS_CC);
swoole_efree(buf);
RETURN_FALSE;
}
else
{
if (ret == 0)
{
swoole_efree(buf);
RETURN_EMPTY_STRING();
}
else
{
buf[ret] = 0;
SW_RETVAL_STRINGL(buf, ret, 0);
}
}
}
swClient_tcp_recv_no_buffer
同步 TCP
客户端接受函数
上一小节中的 cli->recv
实际调用的是 swClient_tcp_recv_no_buffer
函数,无论是同步客户端还是异步客户端都是这个函数,该函数会调用 swConnection_recv
接受数据,直到达到超时时间。
值得注意的是这个函数中的 flag
如果是 MSG_WAITALL
标志,recv
会等待所有的数据(长度为 len
的数据)全部到达之后才会返回。
static int swClient_tcp_recv_no_buffer(swClient *cli, char *data, int len, int flag)
{
int ret;
while (1)
{
ret = swConnection_recv(cli->socket, data, len, flag);
if (ret >= 0)
{
break;
}
if (errno == EINTR)
{
if (cli->interrupt_time <= 0)
{
cli->interrupt_time = swoole_microtime();
}
else if (swoole_microtime() > cli->interrupt_time + cli->timeout)
{
break;
}
else
{
continue;
}
}
#ifdef SW_USE_OPENSSL
if (errno == EAGAIN && cli->socket->ssl)
{
int timeout_ms = (int) (cli->timeout * 1000);
if (cli->socket->ssl_want_read && swSocket_wait(cli->socket->fd, timeout_ms, SW_EVENT_READ) == SW_OK)
{
continue;
}
else if (cli->socket->ssl_want_write && swSocket_wait(cli->socket->fd, timeout_ms, SW_EVENT_WRITE) == SW_OK)
{
continue;
}
}
#endif
break;
}
return ret;
}
swClient_udp_recv
同步 UDP
客户端
对于 UDP
来说,cli->recv
就是函数 swClient_udp_recv
, 本函数会尝试调用两次 recvfrom
:
static int swClient_udp_recv(swClient *cli, char *data, int length, int flags)
{
cli->remote_addr.len = sizeof(cli->remote_addr.addr);
int ret = recvfrom(cli->socket->fd, data, length, flags, (struct sockaddr *) &cli->remote_addr.addr, &cli->remote_addr.len);
if (ret < 0)
{
if (errno == EINTR)
{
ret = recvfrom(cli->socket->fd, data, length, flags, (struct sockaddr *) &cli->remote_addr, &cli->remote_addr.len);
}
else
{
return SW_ERR;
}
}
return ret;
}
swClient_onStreamRead
异步 TCP
客户端读就绪
对于异步 TCP
数据的接受,首先与异步客户端的写就绪类似,首先要判断当前的 SSL
的状态是否是 SW_SSL_STATE_WAIT_STREAM
,再次进行 SSL
握手(具体原因不太清楚)。
判断客户端是否配置了 EOF
检测或者长度检测,如果配置了就调用 swProtocol_recv_check_eof
/swProtocol_recv_check_length
接受完整的数据包,这两天会调用 swClient_onPackage
,进而调用 onReceive
函数。
如果没有配置,那么就简单的调用 swConnection_recv
接受数据,接受到数据之后会调用 onReceive
。
static int swClient_onPackage(swConnection *conn, char *data, uint32_t length)
{
swClient *cli = (swClient *) conn->object;
cli->onReceive(conn->object, data, length);
return conn->close_wait ? SW_ERR : SW_OK;
}
static int swClient_onStreamRead(swReactor *reactor, swEvent *event)
{
int n;
swClient *cli = event->socket->object;
char *buf = cli->buffer->str + cli->buffer->length;
long buf_size = cli->buffer->size - cli->buffer->length;
#ifdef SW_USE_OPENSSL
if (cli->open_ssl && cli->socket->ssl_state == SW_SSL_STATE_WAIT_STREAM)
{
if (swClient_ssl_handshake(cli) < 0)
{
goto connect_fail;
}
if (cli->socket->ssl_state != SW_SSL_STATE_READY)
{
return SW_OK;
}
//ssl handshake sucess
else if (cli->onConnect)
{
execute_onConnect(cli);
}
}
#endif
if (cli->open_eof_check || cli->open_length_check)
{
swConnection *conn = cli->socket;
swProtocol *protocol = &cli->protocol;
if (cli->open_eof_check)
{
n = swProtocol_recv_check_eof(protocol, conn, cli->buffer);
}
else
{
n = swProtocol_recv_check_length(protocol, conn, cli->buffer);
}
if (n < 0)
{
return cli->close(cli);
}
else
{
if (conn->removed == 0 && cli->remove_delay)
{
swClient_sleep(cli);
cli->remove_delay = 0;
}
return SW_OK;
}
}
#ifdef SW_CLIENT_RECV_AGAIN
recv_again:
#endif
n = swConnection_recv(event->socket, buf, buf_size, 0);
if (n < 0)
{
__error:
switch (swConnection_error(errno))
{
case SW_ERROR:
swSysError("Read from socket[%d] failed.", event->fd);
return SW_OK;
case SW_CLOSE:
goto __close;
case SW_WAIT:
return SW_OK;
default:
return SW_OK;
}
}
else if (n == 0)
{
__close:
return cli->close(cli);
}
else
{
cli->onReceive(cli, buf, n);
#ifdef SW_CLIENT_RECV_AGAIN
if (n == buf_size)
{
goto recv_again;
}
#endif
return SW_OK;
}
return SW_OK;
}
swClient_onDgramRead
异步 UDP
客户端接受数据
异步的 UDP
客户端接受数据调用的和同步的客户端相同,都是调用 swClient_udp_recv
函数。
static int swClient_onDgramRead(swReactor *reactor, swEvent *event)
{
swClient *cli = event->socket->object;
char buffer[SW_BUFFER_SIZE_UDP];
int n = swClient_udp_recv(cli, buffer, sizeof(buffer), 0);
if (n < 0)
{
return SW_ERR;
}
else
{
cli->onReceive(cli, buffer, n);
}
return SW_OK;
}
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