| /* |
| * |
| * 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/connected_channel.h" |
| |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "src/core/support/string.h" |
| #include "src/core/transport/transport.h" |
| #include <grpc/byte_buffer.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/slice_buffer.h> |
| |
| #define MAX_BUFFER_LENGTH 8192 |
| |
| typedef struct connected_channel_channel_data |
| { |
| grpc_transport *transport; |
| } channel_data; |
| |
| typedef struct connected_channel_call_data |
| { |
| void *unused; |
| } call_data; |
| |
| /* We perform a small hack to locate transport data alongside the connected |
| channel data in call allocations, to allow everything to be pulled in minimal |
| cache line requests */ |
| #define TRANSPORT_STREAM_FROM_CALL_DATA(calld) ((grpc_stream *)((calld) + 1)) |
| #define CALL_DATA_FROM_TRANSPORT_STREAM(transport_stream) \ |
| (((call_data *)(transport_stream)) - 1) |
| |
| /* Intercept a call operation and either push it directly up or translate it |
| into transport stream operations */ |
| static void |
| con_start_transport_stream_op (grpc_exec_ctx * exec_ctx, grpc_call_element * elem, grpc_transport_stream_op * op) |
| { |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| GRPC_CALL_LOG_OP (GPR_INFO, elem, op); |
| |
| grpc_transport_perform_stream_op (chand->transport, TRANSPORT_STREAM_FROM_CALL_DATA (exec_ctx, calld), op); |
| } |
| |
| static void |
| con_start_transport_op (grpc_exec_ctx * exec_ctx, grpc_channel_element * elem, grpc_transport_op * op) |
| { |
| channel_data *chand = elem->channel_data; |
| grpc_transport_perform_op (exec_ctx, chand->transport, 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) |
| { |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| int r; |
| |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| r = grpc_transport_init_stream (chand->transport, TRANSPORT_STREAM_FROM_CALL_DATA (exec_ctx, calld), server_transport_data, initial_op); |
| GPR_ASSERT (r == 0); |
| } |
| |
| /* Destructor for call_data */ |
| static void |
| destroy_call_elem (grpc_exec_ctx * exec_ctx, grpc_call_element * elem) |
| { |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| grpc_transport_destroy_stream (chand->transport, TRANSPORT_STREAM_FROM_CALL_DATA (exec_ctx, calld)); |
| } |
| |
| /* 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) |
| { |
| channel_data *cd = (channel_data *) elem->channel_data; |
| GPR_ASSERT (is_last); |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| cd->transport = NULL; |
| } |
| |
| /* Destructor for channel_data */ |
| static void |
| destroy_channel_elem (grpc_exec_ctx * exec_ctx, grpc_channel_element * elem) |
| { |
| channel_data *cd = (channel_data *) elem->channel_data; |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| grpc_transport_destroy (exec_ctx, cd->transport); |
| } |
| |
| static char * |
| con_get_peer (grpc_exec_ctx * exec_ctx, grpc_call_element * elem) |
| { |
| channel_data *chand = elem->channel_data; |
| return grpc_transport_get_peer (exec_ctx, chand->transport); |
| } |
| |
| const grpc_channel_filter grpc_connected_channel_filter = { |
| con_start_transport_stream_op, |
| con_start_transport_op, |
| sizeof (call_data), |
| init_call_elem, |
| destroy_call_elem, |
| sizeof (channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| con_get_peer, |
| "connected", |
| }; |
| |
| void |
| grpc_connected_channel_bind_transport (grpc_channel_stack * channel_stack, grpc_transport * transport) |
| { |
| /* Assumes that the connected channel filter is always the last filter |
| in a channel stack */ |
| grpc_channel_element *elem = grpc_channel_stack_last_element (channel_stack); |
| channel_data *cd = (channel_data *) elem->channel_data; |
| GPR_ASSERT (elem->filter == &grpc_connected_channel_filter); |
| GPR_ASSERT (cd->transport == NULL); |
| cd->transport = transport; |
| |
| /* HACK(ctiller): increase call stack size for the channel to make space |
| for channel data. We need a cleaner (but performant) way to do this, |
| and I'm not sure what that is yet. |
| This is only "safe" because call stacks place no additional data after |
| the last call element, and the last call element MUST be the connected |
| channel. */ |
| channel_stack->call_stack_size += grpc_transport_stream_size (transport); |
| } |