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/*
*
* 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_batch(
grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_transport_stream_op_batch *op) {
GRPC_CALL_LOG_OP(GPR_INFO, elem, 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) {
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,
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) {}
const grpc_channel_filter grpc_lame_filter = {
lame_start_transport_stream_op_batch,
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;
}
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