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/*
*
* Copyright 2014, 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/surface/channel.h"
#include <stdlib.h>
#include <string.h>
#include "src/core/surface/call.h"
#include "src/core/surface/client.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
struct grpc_channel {
int is_client;
gpr_refcount refs;
grpc_mdctx *metadata_context;
grpc_mdstr *grpc_status_string;
grpc_mdstr *grpc_message_string;
grpc_mdstr *path_string;
grpc_mdstr *authority_string;
};
#define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c)+1))
#define CHANNEL_FROM_CHANNEL_STACK(channel_stack) (((grpc_channel *)(channel_stack)) - 1)
#define CHANNEL_FROM_TOP_ELEM(top_elem) \
CHANNEL_FROM_CHANNEL_STACK(grpc_channel_stack_from_top_element(top_elem))
grpc_channel *grpc_channel_create_from_filters(
const grpc_channel_filter **filters, size_t num_filters,
const grpc_channel_args *args, grpc_mdctx *mdctx, int is_client) {
size_t size =
sizeof(grpc_channel) + grpc_channel_stack_size(filters, num_filters);
grpc_channel *channel = gpr_malloc(size);
channel->is_client = is_client;
/* decremented by grpc_channel_destroy, and grpc_client_channel_closed if is_client */
gpr_ref_init(&channel->refs, 1 + is_client);
channel->metadata_context = mdctx;
channel->grpc_status_string = grpc_mdstr_from_string(mdctx, "grpc-status");
channel->grpc_message_string = grpc_mdstr_from_string(mdctx, "grpc-message");
channel->path_string = grpc_mdstr_from_string(mdctx, ":path");
channel->authority_string = grpc_mdstr_from_string(mdctx, ":authority");
grpc_channel_stack_init(filters, num_filters, args, channel->metadata_context,
CHANNEL_STACK_FROM_CHANNEL(channel));
return channel;
}
static void do_nothing(void *ignored, grpc_op_error error) {}
grpc_call *grpc_channel_create_call(grpc_channel *channel,
grpc_completion_queue *cq,
const char *method, const char *host,
gpr_timespec absolute_deadline) {
grpc_call *call;
grpc_mdelem *path_mdelem;
grpc_mdelem *authority_mdelem;
grpc_call_op op;
if (!channel->is_client) {
gpr_log(GPR_ERROR, "Cannot create a call on the server.");
return NULL;
}
call = grpc_call_create(channel, cq, NULL);
/* Add :path and :authority headers. */
/* TODO(klempner): Consider optimizing this by stashing mdelems for common
values of method and host. */
path_mdelem = grpc_mdelem_from_metadata_strings(
channel->metadata_context, grpc_mdstr_ref(channel->path_string),
grpc_mdstr_from_string(channel->metadata_context, method));
op.type = GRPC_SEND_METADATA;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.data.metadata = path_mdelem;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
grpc_mdstr_ref(channel->authority_string);
authority_mdelem = grpc_mdelem_from_metadata_strings(
channel->metadata_context, channel->authority_string,
grpc_mdstr_from_string(channel->metadata_context, host));
op.data.metadata = authority_mdelem;
grpc_call_execute_op(call, &op);
if (0 != gpr_time_cmp(absolute_deadline, gpr_inf_future)) {
op.type = GRPC_SEND_DEADLINE;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.data.deadline = absolute_deadline;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
}
return call;
}
grpc_call *grpc_channel_create_call_old(grpc_channel *channel,
const char *method, const char *host,
gpr_timespec absolute_deadline) {
return grpc_channel_create_call(channel, NULL, method, host,
absolute_deadline);
}
void grpc_channel_internal_ref(grpc_channel *channel) {
gpr_ref(&channel->refs);
}
void grpc_channel_internal_unref(grpc_channel *channel) {
if (gpr_unref(&channel->refs)) {
grpc_channel_stack_destroy(CHANNEL_STACK_FROM_CHANNEL(channel));
grpc_mdstr_unref(channel->grpc_status_string);
grpc_mdstr_unref(channel->grpc_message_string);
grpc_mdstr_unref(channel->path_string);
grpc_mdstr_unref(channel->authority_string);
grpc_mdctx_orphan(channel->metadata_context);
gpr_free(channel);
}
}
void grpc_channel_destroy(grpc_channel *channel) {
grpc_channel_op op;
grpc_channel_element *elem;
elem = grpc_channel_stack_element(CHANNEL_STACK_FROM_CHANNEL(channel), 0);
op.type = GRPC_CHANNEL_GOAWAY;
op.dir = GRPC_CALL_DOWN;
op.data.goaway.status = GRPC_STATUS_OK;
op.data.goaway.message = gpr_slice_from_copied_string("Client disconnect");
elem->filter->channel_op(elem, NULL, &op);
op.type = GRPC_CHANNEL_DISCONNECT;
op.dir = GRPC_CALL_DOWN;
elem->filter->channel_op(elem, NULL, &op);
grpc_channel_internal_unref(channel);
}
void grpc_client_channel_closed(grpc_channel_element *elem) {
grpc_channel_internal_unref(CHANNEL_FROM_TOP_ELEM(elem));
}
grpc_channel_stack *grpc_channel_get_channel_stack(grpc_channel *channel) {
return CHANNEL_STACK_FROM_CHANNEL(channel);
}
grpc_mdctx *grpc_channel_get_metadata_context(grpc_channel *channel) {
return channel->metadata_context;
}
grpc_mdstr *grpc_channel_get_status_string(grpc_channel *channel) {
return channel->grpc_status_string;
}
grpc_mdstr *grpc_channel_get_message_string(grpc_channel *channel) {
return channel->grpc_message_string;
}
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