/* * * 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 #include #include #include #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, const 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; }