diff options
Diffstat (limited to 'src/core/lib/surface/lame_client.cc')
-rw-r--r-- | src/core/lib/surface/lame_client.cc | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/core/lib/surface/lame_client.cc b/src/core/lib/surface/lame_client.cc new file mode 100644 index 0000000000..88f4eaac08 --- /dev/null +++ b/src/core/lib/surface/lame_client.cc @@ -0,0 +1,199 @@ +/* + * + * 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 <grpc/grpc.h> + +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> + +#include "src/core/lib/support/atomic.h" + +extern "C" { +#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/surface/lame_client.h" +#include "src/core/lib/transport/static_metadata.h" +} + +namespace grpc_core { + +namespace { + +struct CallData { + grpc_linked_mdelem status; + grpc_linked_mdelem details; + grpc_core::atomic<bool> filled_metadata; +}; + +struct ChannelData { + grpc_status_code error_code; + const char *error_message; +}; + +static void fill_metadata(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + grpc_metadata_batch *mdb) { + CallData *calld = static_cast<CallData *>(elem->call_data); + bool expected = false; + if (!calld->filled_metadata.compare_exchange_strong( + expected, true, grpc_core::memory_order_relaxed, + grpc_core::memory_order_relaxed)) { + return; + } + ChannelData *chand = static_cast<ChannelData *>(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_batch( + grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + grpc_transport_stream_op_batch *op) { + if (op->recv_initial_metadata) { + fill_metadata(exec_ctx, elem, + op->payload->recv_initial_metadata.recv_initial_metadata); + } else if (op->recv_trailing_metadata) { + fill_metadata(exec_ctx, elem, + op->payload->recv_trailing_metadata.recv_trailing_metadata); + } + grpc_transport_stream_op_batch_finish_with_failure( + exec_ctx, op, + GRPC_ERROR_CREATE_FROM_STATIC_STRING("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_FROM_STATIC_STRING("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) { + 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, + grpc_closure *then_schedule_closure) { + grpc_closure_sched(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE); +} + +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) {} + +} // namespace + +} // namespace grpc_core + +extern "C" const grpc_channel_filter grpc_lame_filter = { + grpc_core::lame_start_transport_stream_op_batch, + grpc_core::lame_start_transport_op, + sizeof(grpc_core::CallData), + grpc_core::init_call_elem, + grpc_call_stack_ignore_set_pollset_or_pollset_set, + grpc_core::destroy_call_elem, + sizeof(grpc_core::ChannelData), + grpc_core::init_channel_elem, + grpc_core::destroy_channel_elem, + grpc_core::lame_get_peer, + grpc_core::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; + 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); + auto chand = static_cast<grpc_core::ChannelData *>(elem->channel_data); + chand->error_code = error_code; + chand->error_message = error_message; + grpc_exec_ctx_finish(&exec_ctx); + return channel; +} |