/
iproto.m
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/
iproto.m
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/*
* Copyright (C) 2010, 2011 Mail.RU
* Copyright (C) 2010, 2011 Yuriy Vostrikov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "iproto.h"
#include "exception.h"
#include <stdio.h>
#include <string.h>
#include <errcode.h>
#include <palloc.h>
#include <fiber.h>
#include <tbuf.h>
#include <say.h>
const uint32_t msg_ping = 0xff00;
static void iproto_reply(iproto_callback callback, struct tbuf *request);
static void
iproto_validate_header(struct iproto_header *header);
inline static int
iproto_flush(struct tbuf **in, ssize_t to_read)
{
/*
* Flush output and garbage collect before reading
* next header.
*/
if (to_read > 0) {
if (iov_flush() < 0) {
say_warn("io_error: %s", strerror(errno));
return -1;
}
fiber_gc();
/* Must be reset after fiber_gc() */
*in = fiber->rbuf;
}
return 0;
}
void
iproto_interact(iproto_callback callback)
{
struct tbuf *in = fiber->rbuf;
ssize_t to_read = sizeof(struct iproto_header);
for (;;) {
if (to_read > 0 && fiber_bread(in, to_read) <= 0)
break;
/* validating iproto package header */
iproto_validate_header(iproto(in));
ssize_t request_len = sizeof(struct iproto_header)
+ iproto(in)->len;
to_read = request_len - in->size;
if (iproto_flush(&in, to_read) == -1)
break;
if (to_read > 0 && fiber_bread(in, to_read) <= 0)
break;
struct tbuf *request = tbuf_split(in, request_len);
iproto_reply(callback, request);
to_read = sizeof(struct iproto_header) - in->size;
if (iproto_flush(&in, to_read) == -1)
break;
}
}
/** Stack a reply to a single request to the fiber's io vector. */
static void iproto_reply(iproto_callback callback, struct tbuf *request)
{
struct iproto_header_retcode *reply;
reply = palloc(fiber->gc_pool, sizeof(*reply));
reply->msg_code = iproto(request)->msg_code;
reply->sync = iproto(request)->sync;
if (unlikely(reply->msg_code == msg_ping)) {
reply->len = 0;
iov_add(reply, sizeof(struct iproto_header));
return;
}
reply->len = sizeof(uint32_t); /* ret_code */
iov_add(reply, sizeof(struct iproto_header_retcode));
size_t saved_iov_cnt = fiber->iov_cnt;
/* make request point to iproto data */
request->size = iproto(request)->len;
request->data = iproto(request)->data;
@try {
callback(reply->msg_code, request);
reply->ret_code = 0;
}
@catch (ClientError *e) {
fiber->iov->size -= (fiber->iov_cnt - saved_iov_cnt) * sizeof(struct iovec);
fiber->iov_cnt = saved_iov_cnt;
reply->ret_code = tnt_errcode_val(e->errcode);
iov_dup(e->errmsg, strlen(e->errmsg)+1);
}
for (; saved_iov_cnt < fiber->iov_cnt; saved_iov_cnt++)
reply->len += iovec(fiber->iov)[saved_iov_cnt].iov_len;
}
static void
iproto_validate_header(struct iproto_header *header)
{
if (header->len > IPROTO_BODY_LEN_MAX) {
/*
* The package is too big, just close connection for now to
* avoid DoS.
*/
say_error("received package is too big: %llu",
(unsigned long long)header->len);
tnt_raise(FiberCancelException);
}
}