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
|
/*
*
* 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.
*
*/
#ifndef GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H
#define GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H
#if defined(__GNUC__)
#pragma GCC system_header
#endif
#include <list>
#include <vector>
#include <grpc/compression.h>
#include <grpc/grpc.h>
#include <grpcpp/resource_quota.h>
#include <grpcpp/support/config.h>
namespace grpc {
class SecureChannelCredentials;
namespace testing {
class ChannelArgumentsTest;
} // namespace testing
/// Options for channel creation. The user can use generic setters to pass
/// key value pairs down to C channel creation code. For gRPC related options,
/// concrete setters are provided.
class ChannelArguments {
public:
ChannelArguments();
~ChannelArguments();
ChannelArguments(const ChannelArguments& other);
ChannelArguments& operator=(ChannelArguments other) {
Swap(other);
return *this;
}
void Swap(ChannelArguments& other);
/// Dump arguments in this instance to \a channel_args. Does not take
/// ownership of \a channel_args.
///
/// Note that the underlying arguments are shared. Changes made to either \a
/// channel_args or this instance would be reflected on both.
void SetChannelArgs(grpc_channel_args* channel_args) const;
// gRPC specific channel argument setters
/// Set target name override for SSL host name checking. This option should
/// be used with caution in production.
void SetSslTargetNameOverride(const TString& name);
// TODO(yangg) add flow control options
/// Set the compression algorithm for the channel.
void SetCompressionAlgorithm(grpc_compression_algorithm algorithm);
/// Set the grpclb fallback timeout (in ms) for the channel. If this amount
/// of time has passed but we have not gotten any non-empty \a serverlist from
/// the balancer, we will fall back to use the backend address(es) returned by
/// the resolver.
void SetGrpclbFallbackTimeout(int fallback_timeout);
/// Set a mutator for the underlying socket.
void SetSocketMutator(grpc_socket_mutator* mutator);
/// Set the string to prepend to the user agent.
void SetUserAgentPrefix(const TString& user_agent_prefix);
/// Set the buffer pool to be attached to the constructed channel.
void SetResourceQuota(const grpc::ResourceQuota& resource_quota);
/// Set the max receive and send message sizes.
void SetMaxReceiveMessageSize(int size);
void SetMaxSendMessageSize(int size);
/// Set LB policy name.
/// Note that if the name resolver returns only balancer addresses, the
/// grpclb LB policy will be used, regardless of what is specified here.
void SetLoadBalancingPolicyName(const TString& lb_policy_name);
/// Set service config in JSON form.
/// Primarily meant for use in unit tests.
void SetServiceConfigJSON(const TString& service_config_json);
// Generic channel argument setter. Only for advanced use cases.
/// Set an integer argument \a value under \a key.
void SetInt(const TString& key, int value);
// Generic channel argument setter. Only for advanced use cases.
/// Set a pointer argument \a value under \a key. Ownership is not
/// transferred.
void SetPointer(const TString& key, void* value);
/// Set a pointer argument \a value under \a key, transferring ownership of
/// \a value to the \a ChannelArguments object. The \a vtable::Delete function
/// is responsible for \a value cleanup/destruction when called.
void SetPointerWithVtable(const TString& key, void* value,
const grpc_arg_pointer_vtable* vtable);
/// Set a textual argument \a value under \a key.
void SetString(const TString& key, const TString& value);
/// Return (by value) a C \a grpc_channel_args structure which points to
/// arguments owned by this \a ChannelArguments instance
grpc_channel_args c_channel_args() const {
grpc_channel_args out;
out.num_args = args_.size();
out.args = args_.empty() ? nullptr : const_cast<grpc_arg*>(&args_[0]);
return out;
}
private:
friend class grpc::SecureChannelCredentials;
friend class grpc::testing::ChannelArgumentsTest;
/// Default pointer argument operations.
struct PointerVtableMembers {
static void* Copy(void* in) { return in; }
static void Destroy(void* /*in*/) {}
static int Compare(void* a, void* b) {
if (a < b) return -1;
if (a > b) return 1;
return 0;
}
};
// Returns empty string when it is not set.
TString GetSslTargetNameOverride() const;
std::vector<grpc_arg> args_;
std::list<TString> strings_;
};
} // namespace grpc
#endif // GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H
|
