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 memset(storage, 0, sizeof(grpc_linked_mdelem));
34 storage->md = grpc_mdelem_from_slices(SliceFromCopiedString(key),
35 SliceFromCopiedString(value));
36 GRPC_LOG_IF_ERROR("MetadataBatch::AddMetadata",
37 grpc_metadata_batch_link_head(batch_, storage));
38 return storage;
39 }
40
41 // ChannelData
42
StartTransportOp(grpc_channel_element * elem,TransportOp * op)43 void ChannelData::StartTransportOp(grpc_channel_element* elem,
44 TransportOp* op) {
45 grpc_channel_next_op(elem, op->op());
46 }
47
GetInfo(grpc_channel_element * elem,const grpc_channel_info * channel_info)48 void ChannelData::GetInfo(grpc_channel_element* elem,
49 const grpc_channel_info* channel_info) {
50 grpc_channel_next_get_info(elem, channel_info);
51 }
52
53 // CallData
54
StartTransportStreamOpBatch(grpc_call_element * elem,TransportStreamOpBatch * op)55 void CallData::StartTransportStreamOpBatch(grpc_call_element* elem,
56 TransportStreamOpBatch* op) {
57 grpc_call_next_op(elem, op->op());
58 }
59
SetPollsetOrPollsetSet(grpc_call_element * elem,grpc_polling_entity * pollent)60 void CallData::SetPollsetOrPollsetSet(grpc_call_element* elem,
61 grpc_polling_entity* pollent) {
62 grpc_call_stack_ignore_set_pollset_or_pollset_set(elem, pollent);
63 }
64
65 // internal code used by RegisterChannelFilter()
66
67 namespace internal {
68
69 // Note: Implicitly initialized to nullptr due to static lifetime.
70 std::vector<FilterRecord>* channel_filters;
71
72 namespace {
73
MaybeAddFilter(grpc_channel_stack_builder * builder,void * arg)74 bool MaybeAddFilter(grpc_channel_stack_builder* builder, void* arg) {
75 const FilterRecord& filter = *static_cast<FilterRecord*>(arg);
76 if (filter.include_filter) {
77 const grpc_channel_args* args =
78 grpc_channel_stack_builder_get_channel_arguments(builder);
79 if (!filter.include_filter(*args)) return true;
80 }
81 return grpc_channel_stack_builder_prepend_filter(builder, &filter.filter,
82 nullptr, nullptr);
83 }
84
85 } // namespace
86
ChannelFilterPluginInit()87 void ChannelFilterPluginInit() {
88 for (size_t i = 0; i < channel_filters->size(); ++i) {
89 FilterRecord& filter = (*channel_filters)[i];
90 grpc_channel_init_register_stage(filter.stack_type, filter.priority,
91 MaybeAddFilter, (void*)&filter);
92 }
93 }
94
ChannelFilterPluginShutdown()95 void ChannelFilterPluginShutdown() {}
96
97 } // namespace internal
98
99 } // namespace grpc
100