| /* |
| * |
| * 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/lib/surface/lame_client.h" |
| |
| #include <grpc/grpc.h> |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include "src/core/lib/channel/channel_stack.h" |
| #include "src/core/lib/support/string.h" |
| #include "src/core/lib/surface/api_trace.h" |
| #include "src/core/lib/surface/call.h" |
| #include "src/core/lib/surface/channel.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| |
| typedef struct { |
| grpc_linked_mdelem status; |
| grpc_linked_mdelem details; |
| gpr_atm filled_metadata; |
| } call_data; |
| |
| typedef struct { |
| grpc_status_code error_code; |
| const char *error_message; |
| } channel_data; |
| |
| static void fill_metadata(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| grpc_metadata_batch *mdb) { |
| call_data *calld = elem->call_data; |
| if (!gpr_atm_no_barrier_cas(&calld->filled_metadata, 0, 1)) { |
| return; |
| } |
| channel_data *chand = elem->channel_data; |
| char tmp[GPR_LTOA_MIN_BUFSIZE]; |
| gpr_ltoa(chand->error_code, tmp); |
| calld->status.md = grpc_mdelem_from_slices( |
| exec_ctx, GRPC_MDSTR_GRPC_STATUS, grpc_slice_from_copied_string(tmp)); |
| calld->details.md = grpc_mdelem_from_slices( |
| exec_ctx, GRPC_MDSTR_GRPC_MESSAGE, |
| grpc_slice_from_copied_string(chand->error_message)); |
| calld->status.prev = calld->details.next = NULL; |
| calld->status.next = &calld->details; |
| calld->details.prev = &calld->status; |
| mdb->list.head = &calld->status; |
| mdb->list.tail = &calld->details; |
| mdb->list.count = 2; |
| mdb->deadline = gpr_inf_future(GPR_CLOCK_REALTIME); |
| } |
| |
| static void lame_start_transport_stream_op(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
| if (op->recv_initial_metadata != NULL) { |
| fill_metadata(exec_ctx, elem, op->recv_initial_metadata); |
| } else if (op->recv_trailing_metadata != NULL) { |
| fill_metadata(exec_ctx, elem, op->recv_trailing_metadata); |
| } |
| grpc_transport_stream_op_finish_with_failure( |
| exec_ctx, op, GRPC_ERROR_CREATE("lame client channel")); |
| } |
| |
| static char *lame_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) { |
| return NULL; |
| } |
| |
| static void lame_get_channel_info(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| const grpc_channel_info *channel_info) {} |
| |
| static void lame_start_transport_op(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| grpc_transport_op *op) { |
| if (op->on_connectivity_state_change) { |
| GPR_ASSERT(*op->connectivity_state != GRPC_CHANNEL_SHUTDOWN); |
| *op->connectivity_state = GRPC_CHANNEL_SHUTDOWN; |
| grpc_closure_sched(exec_ctx, op->on_connectivity_state_change, |
| GRPC_ERROR_NONE); |
| } |
| if (op->send_ping != NULL) { |
| grpc_closure_sched(exec_ctx, op->send_ping, |
| GRPC_ERROR_CREATE("lame client channel")); |
| } |
| GRPC_ERROR_UNREF(op->disconnect_with_error); |
| if (op->on_consumed != NULL) { |
| grpc_closure_sched(exec_ctx, op->on_consumed, GRPC_ERROR_NONE); |
| } |
| } |
| |
| static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_call_element_args *args) { |
| call_data *calld = elem->call_data; |
| gpr_atm_no_barrier_store(&calld->filled_metadata, 0); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| const grpc_call_final_info *final_info, |
| void *and_free_memory) { |
| gpr_free(and_free_memory); |
| } |
| |
| static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| grpc_channel_element_args *args) { |
| GPR_ASSERT(args->is_first); |
| GPR_ASSERT(args->is_last); |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem) {} |
| |
| const grpc_channel_filter grpc_lame_filter = { |
| lame_start_transport_stream_op, |
| lame_start_transport_op, |
| sizeof(call_data), |
| init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| lame_get_peer, |
| lame_get_channel_info, |
| "lame-client", |
| }; |
| |
| #define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c) + 1)) |
| |
| grpc_channel *grpc_lame_client_channel_create(const char *target, |
| grpc_status_code error_code, |
| const char *error_message) { |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_channel_element *elem; |
| channel_data *chand; |
| grpc_channel *channel = grpc_channel_create(&exec_ctx, target, NULL, |
| GRPC_CLIENT_LAME_CHANNEL, NULL); |
| elem = grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0); |
| GRPC_API_TRACE( |
| "grpc_lame_client_channel_create(target=%s, error_code=%d, " |
| "error_message=%s)", |
| 3, (target, (int)error_code, error_message)); |
| GPR_ASSERT(elem->filter == &grpc_lame_filter); |
| chand = (channel_data *)elem->channel_data; |
| chand->error_code = error_code; |
| chand->error_message = error_message; |
| grpc_exec_ctx_finish(&exec_ctx); |
| return channel; |
| } |