GCC Code Coverage Report

Directory: libs/http_proto/include/boost/http_proto/
File: boost/http_proto/sink.hpp
Date: 2023-03-01 04:29:23
Exec Total Coverage
Lines: 8 8 100.0%
Functions: 6 7 85.7%
Branches: 1 2 50.0%
Line Branch Exec Source
1 //
2 // Copyright (c) 2023 Vinnie Falco (vinnie.falco@gmail.com)
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // Official repository: https://github.com/CPPAlliance/http_proto
8 //
9
10 #ifndef BOOST_HTTP_PROTO_SINK_HPP
11 #define BOOST_HTTP_PROTO_SINK_HPP
12
13 #include <boost/http_proto/detail/config.hpp>
14 #include <boost/http_proto/buffered_base.hpp>
15 #include <boost/buffers/const_buffer_span.hpp>
16 #include <boost/buffers/type_traits.hpp>
17 #include <boost/system/error_code.hpp>
18 #include <cstddef>
19 #include <type_traits>
20
21 namespace boost {
22 namespace http_proto {
23
24 /** An algorithm for consuming buffers of data.
25
26 This interface abstracts the consumption of
27 a finite stream of data, passed by reading
28 from caller-provided buffers until there
29 is no more input data.
30
31 @par Thread Safety
32 Non-const member functions may not be
33 called concurrently on the same instance.
34 */
35 struct BOOST_SYMBOL_VISIBLE
36 sink
37 : buffered_base
38 {
39 /** The results of consuming data.
40 */
41 struct results
42 {
43 /** The error, if any occurred.
44 */
45 system::error_code ec;
46
47 /** The number of bytes consumed in the input.
48 */
49 std::size_t bytes = 0;
50
51 /** Accumulate results.
52 */
53 results&
54 operator+=(
55 results const& rv) noexcept;
56 };
57
58 /** Consume data.
59
60 This function attempts to write to the
61 sink, by transferring data from the given
62 constant buffer sequence.
63 The return value indicates the number of
64 bytes consumed from the buffers and the
65 error if any occurred.
66
67 @par Preconditions
68 @li @ref init was called, and
69 @li This is the first call to @ref write,
70 or the last value of `more` was `true`.
71
72 @par Postconditions
73 @code
74 rv.ec.failed() == true || rv.bytes == buffer_size(bs)
75 @endcode
76
77 @return The result of the operation.
78
79 @param bs The buffers to use.
80 Each buffer in the sequence will be
81 consumed completely before the next
82 buffer is accessed.
83
84 @param more `true` if there will be one
85 or more subsequent calls to @ref write.
86 */
87 template<class ConstBufferSequence>
88 results
89 18 write(
90 ConstBufferSequence const& bs,
91 bool more)
92 {
93 static_assert(
94 buffers::is_const_buffer_sequence<
95 ConstBufferSequence>::value,
96 "Type requirements not met");
97
98 18 return write_impl(bs, more);
99 }
100
101 #ifdef BOOST_HTTP_PROTO_DOCS
102 protected:
103 #else
104 private:
105 #endif
106 /** Derived class override.
107
108 This pure virtual function is called by
109 the implementation and must be overriden.
110 The callee should attempt to consume data
111 from the given constant buffer.
112 The return value must be set to indicate
113 the number of bytes consumed from the
114 buffers, and the error if any occurred.
115
116 @par Preconditions
117 @li @ref init was called, and
118 @li This is the first call to @ref on_write,
119 or the last value of `more` was `true`.
120
121 @return The result of the operation.
122
123 @param b The buffer to use.
124 If `more` is true then the results
125 must indicate that the buffer was
126 consumed completely, or that an error
127 occurred.
128
129 @param more `true` if there will be one
130 or more subsequent calls to @ref write.
131 */
132 BOOST_HTTP_PROTO_DECL
133 virtual
134 results
135 on_write(
136 buffers::const_buffer b,
137 bool more) = 0;
138
139 /** Derived class override.
140
141 This pure virtual function is called by
142 the implementation and must be overriden.
143 The callee should attempt to consume data
144 from the given constant buffer sequence.
145 The return value must be set to indicate
146 the number of bytes consumed from the
147 buffers, and the error if any occurred.
148
149 @par Preconditions
150 @li @ref init was called, and
151 @li This is the first call to @ref on_write,
152 or the last value of `more` was `true`.
153
154 @return The result of the operation.
155
156 @param bs The buffer sequence to use.
157 Each buffer in the sequence must
158 be completely consumed before data
159 is consumed from the next buffer.
160 If `more` is true then the results
161 must indicate that the buffer was
162 consumed completely, or that an error
163 occurred.
164
165 @param more `true` if there will be one
166 or more subsequent calls to @ref write.
167 */
168 BOOST_HTTP_PROTO_DECL
169 virtual
170 results
171 on_write(
172 buffers::const_buffer_span bs,
173 bool more);
174
175 private:
176 results
177 2 write_impl(
178 buffers::const_buffer const& b,
179 bool more)
180 {
181 2 return on_write(b, more);
182 }
183
184 results
185 2 write_impl(
186 buffers::mutable_buffer const& b,
187 bool more)
188 {
189
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 2 return on_write(b, more);
190 }
191
192 results
193 5 write_impl(
194 buffers::const_buffer_span const& bs,
195 bool more)
196 {
197 5 return on_write(bs, more);
198 }
199
200 template<class T>
201 results
202 write_impl(T const&, bool);
203 };
204
205 //------------------------------------------------
206
207 /** Metafunction which determines if T is a sink
208
209 @see
210 @ref sink.
211 */
212 #ifdef BOOST_HTTP_PROTO_DOCS
213 template<class T>
214 using is_sink = __see_below__;
215 #else
216 template<class T>
217 using is_sink =
218 std::is_convertible<
219 typename std::decay<T>::type*,
220 sink*>;
221 #endif
222
223 } // http_proto
224 } // boost
225
226 #include <boost/http_proto/impl/sink.hpp>
227
228 #endif
229