| /* |
| * |
| * 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, |
| grpc_call_element_args *args) { |
| /* 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; |
| } |
| |
| /* 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_element_args *args) { |
| /* grab pointers to our data from the channel element */ |
| channel_data *channeld = elem->channel_data; |
| |
| /* The last filter tends to be implemented differently to |
| handle the case that there's no 'next' filter to call on the down |
| path */ |
| GPR_ASSERT(!args->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, grpc_call_stack_ignore_set_pollset, destroy_call_elem, |
| sizeof(channel_data), init_channel_elem, destroy_channel_elem, |
| grpc_call_next_get_peer, "no-op"}; |