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
|
/*
*
* Copyright 2015 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/grpc.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/support/atomic.h"
extern "C" {
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/support/string.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/call.h"
#include "src/core/lib/surface/channel.h"
#include "src/core/lib/surface/lame_client.h"
#include "src/core/lib/transport/static_metadata.h"
}
namespace grpc_core {
namespace {
struct CallData {
grpc_linked_mdelem status;
grpc_linked_mdelem details;
grpc_core::atomic<bool> filled_metadata;
};
struct ChannelData {
grpc_status_code error_code;
const char *error_message;
};
static void fill_metadata(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_metadata_batch *mdb) {
CallData *calld = static_cast<CallData *>(elem->call_data);
bool expected = false;
if (!calld->filled_metadata.compare_exchange_strong(
expected, true, grpc_core::memory_order_relaxed,
grpc_core::memory_order_relaxed)) {
return;
}
ChannelData *chand = static_cast<ChannelData *>(elem->channel_data);
char tmp[GPR_LTOA_MIN_BUFSIZE];
gpr_ltoa(chand->error_code, tmp);
calld->status.md = grpc_mdelem_from_slices(
exec_ctx, GRPC_MDSTR_GRPC_STATUS, grpc_slice_from_copied_string(tmp));
calld->details.md = grpc_mdelem_from_slices(
exec_ctx, GRPC_MDSTR_GRPC_MESSAGE,
grpc_slice_from_copied_string(chand->error_message));
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->list.count = 2;
mdb->deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
}
static void lame_start_transport_stream_op_batch(
grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_transport_stream_op_batch *op) {
if (op->recv_initial_metadata) {
fill_metadata(exec_ctx, elem,
op->payload->recv_initial_metadata.recv_initial_metadata);
} else if (op->recv_trailing_metadata) {
fill_metadata(exec_ctx, elem,
op->payload->recv_trailing_metadata.recv_trailing_metadata);
}
grpc_transport_stream_op_batch_finish_with_failure(
exec_ctx, op,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"));
}
static char *lame_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
return NULL;
}
static void lame_get_channel_info(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
const grpc_channel_info *channel_info) {}
static void lame_start_transport_op(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_transport_op *op) {
if (op->on_connectivity_state_change) {
GPR_ASSERT(*op->connectivity_state != GRPC_CHANNEL_SHUTDOWN);
*op->connectivity_state = GRPC_CHANNEL_SHUTDOWN;
GRPC_CLOSURE_SCHED(exec_ctx, op->on_connectivity_state_change,
GRPC_ERROR_NONE);
}
if (op->send_ping != NULL) {
GRPC_CLOSURE_SCHED(
exec_ctx, op->send_ping,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("lame client channel"));
}
GRPC_ERROR_UNREF(op->disconnect_with_error);
if (op->on_consumed != NULL) {
GRPC_CLOSURE_SCHED(exec_ctx, op->on_consumed, GRPC_ERROR_NONE);
}
}
static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
const grpc_call_element_args *args) {
return GRPC_ERROR_NONE;
}
static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
const grpc_call_final_info *final_info,
grpc_closure *then_schedule_closure) {
GRPC_CLOSURE_SCHED(exec_ctx, then_schedule_closure, GRPC_ERROR_NONE);
}
static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
GPR_ASSERT(args->is_first);
GPR_ASSERT(args->is_last);
return GRPC_ERROR_NONE;
}
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {}
} // namespace
} // namespace grpc_core
extern "C" const grpc_channel_filter grpc_lame_filter = {
grpc_core::lame_start_transport_stream_op_batch,
grpc_core::lame_start_transport_op,
sizeof(grpc_core::CallData),
grpc_core::init_call_elem,
grpc_call_stack_ignore_set_pollset_or_pollset_set,
grpc_core::destroy_call_elem,
sizeof(grpc_core::ChannelData),
grpc_core::init_channel_elem,
grpc_core::destroy_channel_elem,
grpc_core::lame_get_peer,
grpc_core::lame_get_channel_info,
"lame-client",
};
#define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c) + 1))
grpc_channel *grpc_lame_client_channel_create(const char *target,
grpc_status_code error_code,
const char *error_message) {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_channel_element *elem;
grpc_channel *channel = grpc_channel_create(&exec_ctx, target, NULL,
GRPC_CLIENT_LAME_CHANNEL, NULL);
elem = grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
GRPC_API_TRACE(
"grpc_lame_client_channel_create(target=%s, error_code=%d, "
"error_message=%s)",
3, (target, (int)error_code, error_message));
GPR_ASSERT(elem->filter == &grpc_lame_filter);
auto chand = static_cast<grpc_core::ChannelData *>(elem->channel_data);
chand->error_code = error_code;
chand->error_message = error_message;
grpc_exec_ctx_finish(&exec_ctx);
return channel;
}
|
