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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
*
* 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/channel/connected_channel.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "src/core/support/string.h"
#include "src/core/transport/transport.h"
#include <grpc/byte_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice_buffer.h>
#define MAX_BUFFER_LENGTH 8192
typedef struct connected_channel_channel_data {
grpc_transport *transport;
} channel_data;
typedef struct connected_channel_call_data { void *unused; } call_data;
/* We perform a small hack to locate transport data alongside the connected
channel data in call allocations, to allow everything to be pulled in minimal
cache line requests */
#define TRANSPORT_STREAM_FROM_CALL_DATA(calld) ((grpc_stream *)((calld) + 1))
#define CALL_DATA_FROM_TRANSPORT_STREAM(transport_stream) \
(((call_data *)(transport_stream)) - 1)
/* Intercept a call operation and either push it directly up or translate it
into transport stream operations */
static void con_start_transport_op(grpc_call_element *elem,
grpc_transport_op *op) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
GRPC_CALL_LOG_OP(GPR_INFO, elem, op);
grpc_transport_perform_op(chand->transport,
TRANSPORT_STREAM_FROM_CALL_DATA(calld), op);
}
/* Currently we assume all channel operations should just be pushed up. */
static void channel_op(grpc_channel_element *elem,
grpc_channel_element *from_elem, grpc_channel_op *op) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
switch (op->type) {
case GRPC_CHANNEL_GOAWAY:
grpc_transport_goaway(chand->transport, op->data.goaway.status,
op->data.goaway.message);
break;
case GRPC_CHANNEL_DISCONNECT:
grpc_transport_close(chand->transport);
break;
default:
GPR_ASSERT(op->dir == GRPC_CALL_UP);
grpc_channel_next_op(elem, op);
break;
}
}
/* Constructor for call_data */
static void init_call_elem(grpc_call_element *elem,
const void *server_transport_data,
grpc_transport_op *initial_op) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
int r;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
r = grpc_transport_init_stream(chand->transport,
TRANSPORT_STREAM_FROM_CALL_DATA(calld),
server_transport_data, initial_op);
GPR_ASSERT(r == 0);
}
/* Destructor for call_data */
static void destroy_call_elem(grpc_call_element *elem) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
grpc_transport_destroy_stream(chand->transport,
TRANSPORT_STREAM_FROM_CALL_DATA(calld));
}
/* Constructor for channel_data */
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 *cd = (channel_data *)elem->channel_data;
GPR_ASSERT(!is_first);
GPR_ASSERT(is_last);
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
cd->transport = NULL;
}
/* Destructor for channel_data */
static void destroy_channel_elem(grpc_channel_element *elem) {
channel_data *cd = (channel_data *)elem->channel_data;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
grpc_transport_destroy(cd->transport);
}
const grpc_channel_filter grpc_connected_channel_filter = {
con_start_transport_op, channel_op, sizeof(call_data), init_call_elem,
destroy_call_elem, sizeof(channel_data), init_channel_elem,
destroy_channel_elem, "connected",
};
/* Transport callback to accept a new stream... calls up to handle it */
static void accept_stream(void *user_data, grpc_transport *transport,
const void *transport_server_data) {
grpc_channel_element *elem = user_data;
channel_data *chand = elem->channel_data;
grpc_channel_op op;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
GPR_ASSERT(chand->transport == transport);
op.type = GRPC_ACCEPT_CALL;
op.dir = GRPC_CALL_UP;
op.data.accept_call.transport = transport;
op.data.accept_call.transport_server_data = transport_server_data;
channel_op(elem, NULL, &op);
}
static void transport_goaway(void *user_data, grpc_transport *transport,
grpc_status_code status, gpr_slice debug) {
/* transport got goaway ==> call up and handle it */
grpc_channel_element *elem = user_data;
channel_data *chand = elem->channel_data;
grpc_channel_op op;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
GPR_ASSERT(chand->transport == transport);
op.type = GRPC_TRANSPORT_GOAWAY;
op.dir = GRPC_CALL_UP;
op.data.goaway.status = status;
op.data.goaway.message = debug;
channel_op(elem, NULL, &op);
}
static void transport_closed(void *user_data, grpc_transport *transport) {
/* transport was closed ==> call up and handle it */
grpc_channel_element *elem = user_data;
channel_data *chand = elem->channel_data;
grpc_channel_op op;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
GPR_ASSERT(chand->transport == transport);
op.type = GRPC_TRANSPORT_CLOSED;
op.dir = GRPC_CALL_UP;
channel_op(elem, NULL, &op);
}
const grpc_transport_callbacks connected_channel_transport_callbacks = {
accept_stream, transport_goaway, transport_closed,
};
grpc_transport_setup_result grpc_connected_channel_bind_transport(
grpc_channel_stack *channel_stack, grpc_transport *transport) {
/* Assumes that the connected channel filter is always the last filter
in a channel stack */
grpc_channel_element *elem = grpc_channel_stack_last_element(channel_stack);
channel_data *cd = (channel_data *)elem->channel_data;
grpc_transport_setup_result ret;
GPR_ASSERT(elem->filter == &grpc_connected_channel_filter);
GPR_ASSERT(cd->transport == NULL);
cd->transport = transport;
/* HACK(ctiller): increase call stack size for the channel to make space
for channel data. We need a cleaner (but performant) way to do this,
and I'm not sure what that is yet.
This is only "safe" because call stacks place no additional data after
the last call element, and the last call element MUST be the connected
channel. */
channel_stack->call_stack_size += grpc_transport_stream_size(transport);
ret.user_data = elem;
ret.callbacks = &connected_channel_transport_callbacks;
return ret;
}
|
