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
|
/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/http/client_authority_filter.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/surface/call.h"
#include "src/core/lib/surface/channel_init.h"
#include "src/core/lib/surface/channel_stack_type.h"
#include "src/core/lib/transport/static_metadata.h"
namespace {
struct call_data {
grpc_linked_mdelem authority_storage;
grpc_call_combiner* call_combiner;
};
struct channel_data {
grpc_slice default_authority;
};
void authority_start_transport_stream_op_batch(
grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
call_data* calld = static_cast<call_data*>(elem->call_data);
// Handle send_initial_metadata.
auto* initial_metadata =
batch->payload->send_initial_metadata.send_initial_metadata;
// If the initial metadata doesn't already contain :authority, add it.
if (batch->send_initial_metadata &&
initial_metadata->idx.named.authority == nullptr) {
grpc_error* error = grpc_metadata_batch_add_head(
initial_metadata, &calld->authority_storage,
grpc_mdelem_from_slices(
GRPC_MDSTR_AUTHORITY,
grpc_slice_ref_internal(chand->default_authority)));
if (error != GRPC_ERROR_NONE) {
grpc_transport_stream_op_batch_finish_with_failure(batch, error,
calld->call_combiner);
return;
}
}
// Pass control down the stack.
grpc_call_next_op(elem, batch);
}
/* Constructor for call_data */
grpc_error* init_call_elem(grpc_call_element* elem,
const grpc_call_element_args* args) {
call_data* calld = static_cast<call_data*>(elem->call_data);
calld->call_combiner = args->call_combiner;
return GRPC_ERROR_NONE;
}
/* Destructor for call_data */
void destroy_call_elem(grpc_call_element* elem,
const grpc_call_final_info* final_info,
grpc_closure* ignored) {}
/* Constructor for channel_data */
grpc_error* init_channel_elem(grpc_channel_element* elem,
grpc_channel_element_args* args) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
const grpc_arg* default_authority_arg =
grpc_channel_args_find(args->channel_args, GRPC_ARG_DEFAULT_AUTHORITY);
if (default_authority_arg == nullptr) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"GRPC_ARG_DEFAULT_AUTHORITY channel arg. not found. Note that direct "
"channels must explicity specify a value for this argument.");
}
const char* default_authority_str =
grpc_channel_arg_get_string(default_authority_arg);
if (default_authority_str == nullptr) {
return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"GRPC_ARG_DEFAULT_AUTHORITY channel arg. must be a string");
}
chand->default_authority =
grpc_slice_from_copied_string(default_authority_str);
GPR_ASSERT(!args->is_last);
return GRPC_ERROR_NONE;
}
/* Destructor for channel data */
void destroy_channel_elem(grpc_channel_element* elem) {
channel_data* chand = static_cast<channel_data*>(elem->channel_data);
grpc_slice_unref_internal(chand->default_authority);
}
} // namespace
const grpc_channel_filter grpc_client_authority_filter = {
authority_start_transport_stream_op_batch,
grpc_channel_next_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,
grpc_channel_next_get_info,
"authority"};
static bool add_client_authority_filter(grpc_channel_stack_builder* builder,
void* arg) {
const grpc_channel_args* channel_args =
grpc_channel_stack_builder_get_channel_arguments(builder);
const grpc_arg* disable_client_authority_filter_arg = grpc_channel_args_find(
channel_args, GRPC_ARG_DISABLE_CLIENT_AUTHORITY_FILTER);
if (disable_client_authority_filter_arg != nullptr) {
const bool is_client_authority_filter_disabled =
grpc_channel_arg_get_bool(disable_client_authority_filter_arg, false);
if (is_client_authority_filter_disabled) {
return true;
}
}
return grpc_channel_stack_builder_prepend_filter(
builder, static_cast<const grpc_channel_filter*>(arg), nullptr, nullptr);
}
void grpc_client_authority_filter_init(void) {
grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL, INT_MAX,
add_client_authority_filter,
(void*)&grpc_client_authority_filter);
grpc_channel_init_register_stage(GRPC_CLIENT_DIRECT_CHANNEL, INT_MAX,
add_client_authority_filter,
(void*)&grpc_client_authority_filter);
}
void grpc_client_authority_filter_shutdown(void) {}
|