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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 <grpc/grpc.h>
#include <string.h>
#include "src/core/channel/channel_stack.h"
#include "src/core/support/string.h"
#include "src/core/surface/channel.h"
#include "src/core/surface/call.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
typedef struct {
grpc_linked_mdelem status;
grpc_linked_mdelem details;
} call_data;
typedef struct { grpc_mdctx *mdctx; } channel_data;
static void lame_start_transport_op(grpc_call_element *elem,
grpc_transport_op *op) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
GRPC_CALL_LOG_OP(GPR_INFO, elem, op);
if (op->send_ops) {
grpc_stream_ops_unref_owned_objects(op->send_ops->ops, op->send_ops->nops);
op->on_done_send(op->send_user_data, 0);
}
if (op->recv_ops) {
char tmp[GPR_LTOA_MIN_BUFSIZE];
grpc_metadata_batch mdb;
gpr_ltoa(GRPC_STATUS_UNKNOWN, tmp);
calld->status.md =
grpc_mdelem_from_strings(chand->mdctx, "grpc-status", tmp);
calld->details.md = grpc_mdelem_from_strings(chand->mdctx, "grpc-message",
"Rpc sent on a lame channel.");
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.garbage.head = mdb.garbage.tail = NULL;
mdb.deadline = gpr_inf_future;
grpc_sopb_add_metadata(op->recv_ops, mdb);
*op->recv_state = GRPC_STREAM_CLOSED;
op->on_done_recv(op->recv_user_data, 1);
}
}
static void channel_op(grpc_channel_element *elem,
grpc_channel_element *from_elem, grpc_channel_op *op) {
switch (op->type) {
case GRPC_CHANNEL_GOAWAY:
gpr_slice_unref(op->data.goaway.message);
break;
case GRPC_CHANNEL_DISCONNECT:
grpc_client_channel_closed(elem);
break;
default:
break;
}
}
static void init_call_elem(grpc_call_element *elem,
const void *transport_server_data,
grpc_transport_op *initial_op) {
if (initial_op) {
grpc_transport_op_finish_with_failure(initial_op);
}
}
static void destroy_call_elem(grpc_call_element *elem) {}
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 *chand = elem->channel_data;
GPR_ASSERT(is_first);
GPR_ASSERT(is_last);
chand->mdctx = mdctx;
}
static void destroy_channel_elem(grpc_channel_element *elem) {}
static const grpc_channel_filter lame_filter = {
lame_start_transport_op, channel_op, sizeof(call_data), init_call_elem,
destroy_call_elem, sizeof(channel_data), init_channel_elem,
destroy_channel_elem, "lame-client",
};
grpc_channel *grpc_lame_client_channel_create(void) {
static const grpc_channel_filter *filters[] = {&lame_filter};
return grpc_channel_create_from_filters(filters, 1, NULL, grpc_mdctx_create(),
1);
}
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