| /* |
| * |
| * 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_op(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_op(chand->transport, |
| TRANSPORT_STREAM_FROM_CALL_DATA(calld), op); |
| } |
| |
| /* Currently we assume all channel operations should just be pushed up. */ |
| static void channel_op(grpc_channel_element *elem, |
| grpc_channel_element *from_elem, grpc_channel_op *op) { |
| channel_data *chand = elem->channel_data; |
| GPR_ASSERT(elem->filter == &grpc_connected_channel_filter); |
| |
| switch (op->type) { |
| case GRPC_CHANNEL_GOAWAY: |
| grpc_transport_goaway(chand->transport, op->data.goaway.status, |
| op->data.goaway.message); |
| break; |
| case GRPC_CHANNEL_DISCONNECT: |
| grpc_transport_close(chand->transport); |
| break; |
| default: |
| GPR_ASSERT(op->dir == GRPC_CALL_UP); |
| grpc_channel_next_op(elem, op); |
| break; |
| } |
| } |
| |
| /* Constructor for call_data */ |
| static void init_call_elem(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(calld), |
| server_transport_data, initial_op); |
| GPR_ASSERT(r == 0); |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(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(calld)); |
| } |
| |
| /* Constructor for channel_data */ |
| static void init_channel_elem(grpc_channel_element *elem, |
| 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_first); |
| 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_channel_element *elem) { |
| channel_data *cd = (channel_data *)elem->channel_data; |
| GPR_ASSERT(elem->filter == &grpc_connected_channel_filter); |
| grpc_transport_destroy(cd->transport); |
| } |
| |
| const grpc_channel_filter grpc_connected_channel_filter = { |
| con_start_transport_op, channel_op, sizeof(call_data), init_call_elem, |
| destroy_call_elem, sizeof(channel_data), init_channel_elem, |
| destroy_channel_elem, "connected", |
| }; |
| |
| /* Transport callback to accept a new stream... calls up to handle it */ |
| static void accept_stream(void *user_data, grpc_transport *transport, |
| const void *transport_server_data) { |
| grpc_channel_element *elem = user_data; |
| channel_data *chand = elem->channel_data; |
| grpc_channel_op op; |
| |
| GPR_ASSERT(elem->filter == &grpc_connected_channel_filter); |
| GPR_ASSERT(chand->transport == transport); |
| |
| op.type = GRPC_ACCEPT_CALL; |
| op.dir = GRPC_CALL_UP; |
| op.data.accept_call.transport = transport; |
| op.data.accept_call.transport_server_data = transport_server_data; |
| channel_op(elem, NULL, &op); |
| } |
| |
| static void transport_goaway(void *user_data, grpc_transport *transport, |
| grpc_status_code status, gpr_slice debug) { |
| /* transport got goaway ==> call up and handle it */ |
| grpc_channel_element *elem = user_data; |
| channel_data *chand = elem->channel_data; |
| grpc_channel_op op; |
| |
| GPR_ASSERT(elem->filter == &grpc_connected_channel_filter); |
| GPR_ASSERT(chand->transport == transport); |
| |
| op.type = GRPC_TRANSPORT_GOAWAY; |
| op.dir = GRPC_CALL_UP; |
| op.data.goaway.status = status; |
| op.data.goaway.message = debug; |
| channel_op(elem, NULL, &op); |
| } |
| |
| static void transport_closed(void *user_data, grpc_transport *transport) { |
| /* transport was closed ==> call up and handle it */ |
| grpc_channel_element *elem = user_data; |
| channel_data *chand = elem->channel_data; |
| grpc_channel_op op; |
| |
| GPR_ASSERT(elem->filter == &grpc_connected_channel_filter); |
| GPR_ASSERT(chand->transport == transport); |
| |
| op.type = GRPC_TRANSPORT_CLOSED; |
| op.dir = GRPC_CALL_UP; |
| channel_op(elem, NULL, &op); |
| } |
| |
| const grpc_transport_callbacks connected_channel_transport_callbacks = { |
| accept_stream, transport_goaway, transport_closed, |
| }; |
| |
| grpc_transport_setup_result 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; |
| grpc_transport_setup_result ret; |
| 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); |
| |
| ret.user_data = elem; |
| ret.callbacks = &connected_channel_transport_callbacks; |
| return ret; |
| } |