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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
* OWNER 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 "src/core/channel/noop_filter.h"
#include <grpc/support/log.h>
typedef struct call_data {
int unused; /* C89 requires at least one struct element */
} call_data;
typedef struct channel_data {
int unused; /* C89 requires at least one struct element */
} channel_data;
/* used to silence 'variable not used' warnings */
static void ignore_unused(void *ignored) {}
static void noop_mutate_op(grpc_call_element *elem,
grpc_transport_stream_op *op) {
/* grab pointers to our data from the call element */
call_data *calld = elem->call_data;
channel_data *channeld = elem->channel_data;
ignore_unused(calld);
ignore_unused(channeld);
/* do nothing */
}
/* Called either:
- in response to an API call (or similar) from above, to send something
- a network event (or similar) from below, to receive something
op contains type and call direction information, in addition to the data
that is being sent or received. */
static void noop_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
noop_mutate_op(elem, op);
/* pass control down the stack */
grpc_call_next_op(exec_ctx, elem, op);
}
/* Constructor for call_data */
static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
const void *server_transport_data,
grpc_transport_stream_op *initial_op) {
/* grab pointers to our data from the call element */
call_data *calld = elem->call_data;
channel_data *channeld = elem->channel_data;
/* initialize members */
calld->unused = channeld->unused;
if (initial_op) noop_mutate_op(elem, initial_op);
}
/* Destructor for call_data */
static void destroy_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem) {}
/* Constructor for channel_data */
static void init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem, grpc_channel *master,
const grpc_channel_args *args, grpc_mdctx *mdctx,
int is_first, int is_last) {
/* grab pointers to our data from the channel element */
channel_data *channeld = elem->channel_data;
/* The first and the last filters tend to be implemented differently to
handle the case that there's no 'next' filter to call on the up or down
path */
GPR_ASSERT(!is_first);
GPR_ASSERT(!is_last);
/* initialize members */
channeld->unused = 0;
}
/* Destructor for channel data */
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {
/* grab pointers to our data from the channel element */
channel_data *channeld = elem->channel_data;
ignore_unused(channeld);
}
const grpc_channel_filter grpc_no_op_filter = {
noop_start_transport_stream_op, grpc_channel_next_op, sizeof(call_data),
init_call_elem, destroy_call_elem, sizeof(channel_data), init_channel_elem,
destroy_channel_elem, grpc_call_next_get_peer, "no-op"};
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