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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
*
* Copyright 2017 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_IMPL_CODEGEN_BYTE_BUFFER_H
#define GRPCPP_IMPL_CODEGEN_BYTE_BUFFER_H
#include <grpc/impl/codegen/byte_buffer.h>
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen_interface.h>
#include <grpcpp/impl/codegen/serialization_traits.h>
#include <grpcpp/impl/codegen/slice.h>
#include <grpcpp/impl/codegen/status.h>
#include <vector>
namespace grpc {
class ServerInterface;
class ByteBuffer;
class ServerInterface;
namespace internal {
template <class RequestType, class ResponseType>
class CallbackUnaryHandler;
template <class RequestType, class ResponseType>
class CallbackServerStreamingHandler;
template <class ServiceType, class RequestType, class ResponseType>
class RpcMethodHandler;
template <class ServiceType, class RequestType, class ResponseType>
class ServerStreamingHandler;
template <::grpc::StatusCode code>
class ErrorMethodHandler;
class CallOpSendMessage;
template <class R>
class CallOpRecvMessage;
class CallOpGenericRecvMessage;
class ExternalConnectionAcceptorImpl;
template <class R>
class DeserializeFuncType;
class GrpcByteBufferPeer;
} // namespace internal
/// A sequence of bytes.
class ByteBuffer final {
public:
/// Constuct an empty buffer.
ByteBuffer() : buffer_(nullptr) {}
/// Construct buffer from \a slices, of which there are \a nslices.
ByteBuffer(const Slice* slices, size_t nslices) {
// The following assertions check that the representation of a grpc::Slice
// is identical to that of a grpc_slice: it has a grpc_slice field, and
// nothing else.
static_assert(std::is_same<decltype(slices[0].slice_), grpc_slice>::value,
"Slice must have same representation as grpc_slice");
static_assert(sizeof(Slice) == sizeof(grpc_slice),
"Slice must have same representation as grpc_slice");
// The following assertions check that the representation of a ByteBuffer is
// identical to grpc_byte_buffer*: it has a grpc_byte_buffer* field,
// and nothing else.
static_assert(std::is_same<decltype(buffer_), grpc_byte_buffer*>::value,
"ByteBuffer must have same representation as "
"grpc_byte_buffer*");
static_assert(sizeof(ByteBuffer) == sizeof(grpc_byte_buffer*),
"ByteBuffer must have same representation as "
"grpc_byte_buffer*");
// The const_cast is legal if grpc_raw_byte_buffer_create() does no more
// than its advertised side effect of increasing the reference count of the
// slices it processes, and such an increase does not affect the semantics
// seen by the caller of this constructor.
buffer_ = g_core_codegen_interface->grpc_raw_byte_buffer_create(
reinterpret_cast<grpc_slice*>(const_cast<Slice*>(slices)), nslices);
}
/// Constuct a byte buffer by referencing elements of existing buffer
/// \a buf. Wrapper of core function grpc_byte_buffer_copy . This is not
/// a deep copy; it is just a referencing. As a result, its performance is
/// size-independent.
ByteBuffer(const ByteBuffer& buf) : buffer_(nullptr) { operator=(buf); }
~ByteBuffer() {
if (buffer_) {
g_core_codegen_interface->grpc_byte_buffer_destroy(buffer_);
}
}
/// Wrapper of core function grpc_byte_buffer_copy . This is not
/// a deep copy; it is just a referencing. As a result, its performance is
/// size-independent.
ByteBuffer& operator=(const ByteBuffer& buf) {
if (this != &buf) {
Clear(); // first remove existing data
}
if (buf.buffer_) {
// then copy
buffer_ = g_core_codegen_interface->grpc_byte_buffer_copy(buf.buffer_);
}
return *this;
}
/// Dump (read) the buffer contents into \a slices.
Status Dump(std::vector<Slice>* slices) const;
/// Remove all data.
void Clear() {
if (buffer_) {
g_core_codegen_interface->grpc_byte_buffer_destroy(buffer_);
buffer_ = nullptr;
}
}
/// Make a duplicate copy of the internals of this byte
/// buffer so that we have our own owned version of it.
/// bbuf.Duplicate(); is equivalent to bbuf=bbuf; but is actually readable.
/// This is not a deep copy; it is a referencing and its performance
/// is size-independent.
void Duplicate() {
buffer_ = g_core_codegen_interface->grpc_byte_buffer_copy(buffer_);
}
/// Forget underlying byte buffer without destroying
/// Use this only for un-owned byte buffers
void Release() { buffer_ = nullptr; }
/// Buffer size in bytes.
size_t Length() const {
return buffer_ == nullptr
? 0
: g_core_codegen_interface->grpc_byte_buffer_length(buffer_);
}
/// Swap the state of *this and *other.
void Swap(ByteBuffer* other) {
grpc_byte_buffer* tmp = other->buffer_;
other->buffer_ = buffer_;
buffer_ = tmp;
}
/// Is this ByteBuffer valid?
bool Valid() const { return (buffer_ != nullptr); }
private:
friend class SerializationTraits<ByteBuffer, void>;
friend class ServerInterface;
friend class internal::CallOpSendMessage;
template <class R>
friend class internal::CallOpRecvMessage;
friend class internal::CallOpGenericRecvMessage;
template <class ServiceType, class RequestType, class ResponseType>
friend class internal::RpcMethodHandler;
template <class ServiceType, class RequestType, class ResponseType>
friend class internal::ServerStreamingHandler;
template <class RequestType, class ResponseType>
friend class internal::CallbackUnaryHandler;
template <class RequestType, class ResponseType>
friend class internal::CallbackServerStreamingHandler;
template <StatusCode code>
friend class internal::ErrorMethodHandler;
template <class R>
friend class internal::DeserializeFuncType;
friend class ProtoBufferReader;
friend class ProtoBufferWriter;
friend class internal::GrpcByteBufferPeer;
friend class internal::ExternalConnectionAcceptorImpl;
grpc_byte_buffer* buffer_;
// takes ownership
void set_buffer(grpc_byte_buffer* buf) {
if (buffer_) {
Clear();
}
buffer_ = buf;
}
grpc_byte_buffer* c_buffer() { return buffer_; }
grpc_byte_buffer** c_buffer_ptr() { return &buffer_; }
class ByteBufferPointer {
public:
ByteBufferPointer(const ByteBuffer* b)
: bbuf_(const_cast<ByteBuffer*>(b)) {}
operator ByteBuffer*() { return bbuf_; }
operator grpc_byte_buffer*() { return bbuf_->buffer_; }
operator grpc_byte_buffer**() { return &bbuf_->buffer_; }
private:
ByteBuffer* bbuf_;
};
ByteBufferPointer bbuf_ptr() const { return ByteBufferPointer(this); }
};
template <>
class SerializationTraits<ByteBuffer, void> {
public:
static Status Deserialize(ByteBuffer* byte_buffer, ByteBuffer* dest) {
dest->set_buffer(byte_buffer->buffer_);
return Status::OK;
}
static Status Serialize(const ByteBuffer& source, ByteBuffer* buffer,
bool* own_buffer) {
*buffer = source;
*own_buffer = true;
return g_core_codegen_interface->ok();
}
};
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_BYTE_BUFFER_H
|
