1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
*
* 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))
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 */
gpr_ref_init(&channel->refs, 1);
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, const char *method,
const char *host,
gpr_timespec absolute_deadline) {
grpc_call *call;
grpc_mdelem *path_mdelem;
grpc_mdelem *authority_mdelem;
if (!channel->is_client) {
gpr_log(GPR_ERROR, "Cannot create a call on the server.");
return NULL;
}
call = grpc_call_create(channel, NULL);
/* Add :path and :authority headers. */
/* TODO(klempner): Consider optimizing this by stashing mdelems for common
values of method and host. */
grpc_mdstr_ref(channel->path_string);
path_mdelem = grpc_mdelem_from_metadata_strings(
channel->metadata_context, channel->path_string,
grpc_mdstr_from_string(channel->metadata_context, method));
grpc_call_add_mdelem(call, path_mdelem, 0);
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));
grpc_call_add_mdelem(call, authority_mdelem, 0);
if (0 != gpr_time_cmp(absolute_deadline, gpr_inf_future)) {
grpc_call_op op;
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;
}
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);
}
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;
}
|
