1 /*
2 *
3 * Copyright 2016 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <string.h>
20
21 #include "src/core/lib/channel/channel_stack.h"
22 #include "src/cpp/common/channel_filter.h"
23
24 #include <grpcpp/impl/codegen/slice.h>
25
26 namespace grpc {
27
28 // MetadataBatch
29
AddMetadata(const string & key,const string & value)30 grpc_linked_mdelem* MetadataBatch::AddMetadata(const string& key,
31 const string& value) {
32 grpc_linked_mdelem* storage = new grpc_linked_mdelem;
33 storage->md = grpc_mdelem_from_slices(SliceFromCopiedString(key),
34 SliceFromCopiedString(value));
35 GRPC_LOG_IF_ERROR("MetadataBatch::AddMetadata",
36 grpc_metadata_batch_link_head(batch_, storage));
37 return storage;
38 }
39
40 // ChannelData
41
StartTransportOp(grpc_channel_element * elem,TransportOp * op)42 void ChannelData::StartTransportOp(grpc_channel_element* elem,
43 TransportOp* op) {
44 grpc_channel_next_op(elem, op->op());
45 }
46
GetInfo(grpc_channel_element * elem,const grpc_channel_info * channel_info)47 void ChannelData::GetInfo(grpc_channel_element* elem,
48 const grpc_channel_info* channel_info) {
49 grpc_channel_next_get_info(elem, channel_info);
50 }
51
52 // CallData
53
StartTransportStreamOpBatch(grpc_call_element * elem,TransportStreamOpBatch * op)54 void CallData::StartTransportStreamOpBatch(grpc_call_element* elem,
55 TransportStreamOpBatch* op) {
56 grpc_call_next_op(elem, op->op());
57 }
58
SetPollsetOrPollsetSet(grpc_call_element * elem,grpc_polling_entity * pollent)59 void CallData::SetPollsetOrPollsetSet(grpc_call_element* elem,
60 grpc_polling_entity* pollent) {
61 grpc_call_stack_ignore_set_pollset_or_pollset_set(elem, pollent);
62 }
63
64 // internal code used by RegisterChannelFilter()
65
66 namespace internal {
67
68 // Note: Implicitly initialized to nullptr due to static lifetime.
69 std::vector<FilterRecord>* channel_filters;
70
71 namespace {
72
MaybeAddFilter(grpc_channel_stack_builder * builder,void * arg)73 bool MaybeAddFilter(grpc_channel_stack_builder* builder, void* arg) {
74 const FilterRecord& filter = *static_cast<FilterRecord*>(arg);
75 if (filter.include_filter) {
76 const grpc_channel_args* args =
77 grpc_channel_stack_builder_get_channel_arguments(builder);
78 if (!filter.include_filter(*args)) return true;
79 }
80 return grpc_channel_stack_builder_prepend_filter(builder, &filter.filter,
81 nullptr, nullptr);
82 }
83
84 } // namespace
85
ChannelFilterPluginInit()86 void ChannelFilterPluginInit() {
87 for (size_t i = 0; i < channel_filters->size(); ++i) {
88 FilterRecord& filter = (*channel_filters)[i];
89 grpc_channel_init_register_stage(filter.stack_type, filter.priority,
90 MaybeAddFilter, &filter);
91 }
92 }
93
ChannelFilterPluginShutdown()94 void ChannelFilterPluginShutdown() {}
95
96 } // namespace internal
97
98 } // namespace grpc
99