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xahaud/beast/asio/src/test/beast_asio_buffers_test.cpp
Vinnie Falco 3461bafaa2 Beast.Asio: 
New classes:

  class async_completion:
    Helper class for implementing asynchronous initiation functions.
    See n3964:
        Library Foundations for Asynchronous Operations, Revision 1
        http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3964.pdf

  class basic_streambuf:
    Meets the requirements of Streambuf.

  class buffered_readstream:
    Buffers a ReadStream with a ConstBufferSequence.

  class consuming_buffers:
    Adapts a BufferSequence which wraps the underlying buffer
    sequence and presents fewer bytes, with the retained bytes
    occurring at the end of the sequence.

  class handler_alloc:
    A C++ Allocator the uses asio handler allocation hooks.

  class static_streambuf:
    An implementation of the Streambuf concept that uses a
    fixed size buffer with size determined at compile-time.

  class streambuf_readstream:
    Buffers a ReadStream with a Streambuf.

New functions:

  append_buffers()
    Returns a new BufferSequence which efficiently concatenates
    two or more buffer sequences together.

  prepare_buffers()
    Shortens a buffer sequence. The bytes excluded are at the
    end of the underlying buffer sequence.

  boost::asio::read_until()
    A copy of boost::asio::read_until overloads, modified to work
    with a beast::asio::basic_streambuf.

Debugging:

  buffers_to_string()

    Convert a ConstBufferSequence to a human readable string
    suitable for diagnostics.

type_check.h:

  Metafunctions for checking asio concepts:
    AsyncReadStream, AsyncWriteStream
    SyncReadStream, SyncWriteStream
    ConstBufferSequence, MutableBufferSequence
    Streambuf
    Handler

Changes:

* All symbols moved up a namespace level.
* streambuf provides all move and copy special members,
  behavior of moved from objects is well-defined.

Fixes:

* Fix basic_streambuf iterator category.
2016-04-20 05:16:38 -04:00

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//------------------------------------------------------------------------------
/*
This file is part of Beast: https://github.com/vinniefalco/Beast
Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#include <beast/asio/append_buffers.h>
#include <beast/asio/buffers_adapter.h>
#include <beast/asio/prepare_buffers.h>
#include <beast/asio/consuming_buffers.h>
#include <beast/asio/streambuf.h>
#include <beast/asio/static_streambuf.h>
#include <beast/asio/streambuf_readstream.h>
#include <beast/unit_test/suite.h>
#include <boost/asio/buffer.hpp>
#include <array>
#include <list>
#include <string>
namespace beast {
namespace test {
class buffers_test : public unit_test::suite
{
public:
template<class ConstBufferSequence>
static
std::string
to_string(ConstBufferSequence const& bs)
{
using boost::asio::buffer_cast;
using boost::asio::buffer_size;
std::string s;
s.reserve(buffer_size(bs));
for(auto const& b : bs)
s.append(buffer_cast<char const*>(b),
buffer_size(b));
return s;
}
void testStreambuf()
{
using boost::asio::buffer;
using boost::asio::buffer_cast;
using boost::asio::buffer_size;
std::string const s = "Hello, world";
expect(s.size() == 12);
for(std::size_t i = 1; i < 12; ++i) {
for(std::size_t x = 1; x < 4; ++x) {
for(std::size_t y = 1; y < 4; ++y) {
for(std::size_t t = 1; t < 4; ++ t) {
for(std::size_t u = 1; u < 4; ++ u) {
std::size_t z = s.size() - (x + y);
std::size_t v = s.size() - (t + u);
{
streambuf sb(i);
decltype(sb)::mutable_buffers_type d;
d = sb.prepare(z); expect(buffer_size(d) == z);
d = sb.prepare(0); expect(buffer_size(d) == 0);
d = sb.prepare(y); expect(buffer_size(d) == y);
d = sb.prepare(x); expect(buffer_size(d) == x);
sb.commit(buffer_copy(d, buffer(s.data(), x)));
expect(sb.size() == x);
expect(buffer_size(sb.data()) == sb.size());
d = sb.prepare(x); expect(buffer_size(d) == x);
d = sb.prepare(0); expect(buffer_size(d) == 0);
d = sb.prepare(z); expect(buffer_size(d) == z);
d = sb.prepare(y); expect(buffer_size(d) == y);
sb.commit(buffer_copy(d, buffer(s.data()+x, y)));
sb.commit(1);
expect(sb.size() == x + y);
expect(buffer_size(sb.data()) == sb.size());
d = sb.prepare(x); expect(buffer_size(d) == x);
d = sb.prepare(y); expect(buffer_size(d) == y);
d = sb.prepare(0); expect(buffer_size(d) == 0);
d = sb.prepare(z); expect(buffer_size(d) == z);
sb.commit(buffer_copy(d, buffer(s.data()+x+y, z)));
sb.commit(2);
expect(sb.size() == x + y + z);
expect(buffer_size(sb.data()) == sb.size());
expect(to_string(sb.data()) == s);
sb.consume(t);
d = sb.prepare(0); expect(buffer_size(d) == 0);
expect(to_string(sb.data()) == s.substr(t, std::string::npos));
sb.consume(u);
expect(to_string(sb.data()) == s.substr(t + u, std::string::npos));
sb.consume(v);
expect(to_string(sb.data()) == "");
sb.consume(1);
d = sb.prepare(0); expect(buffer_size(d) == 0);
}
}}}}}
}
void testBuffersAdapter()
{
using boost::asio::buffer;
using boost::asio::buffer_cast;
using boost::asio::buffer_size;
using boost::asio::const_buffer;
using boost::asio::mutable_buffer;
char buf[12];
std::string const s = "Hello, world";
expect(s.size() == sizeof(buf));
for(std::size_t i = 1; i < 4; ++i) {
for(std::size_t j = 1; j < 4; ++j) {
for(std::size_t x = 1; x < 4; ++x) {
for(std::size_t y = 1; y < 4; ++y) {
for(std::size_t t = 1; t < 4; ++ t) {
for(std::size_t u = 1; u < 4; ++ u) {
std::size_t k = sizeof(buf) - (i + j);
std::size_t z = sizeof(buf) - (x + y);
std::size_t v = sizeof(buf) - (t + u);
{
std::memset(buf, 0, sizeof(buf));
std::array<mutable_buffer, 3> bs{{
mutable_buffer{&buf[0], i},
mutable_buffer{&buf[i], j},
mutable_buffer{&buf[i+j], k}}};
buffers_adapter<decltype(bs)> ba(std::move(bs));
expect(ba.max_size() == sizeof(buf));
decltype(ba)::mutable_buffers_type d;
d = ba.prepare(z); expect(buffer_size(d) == z);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(y); expect(buffer_size(d) == y);
d = ba.prepare(x); expect(buffer_size(d) == x);
ba.commit(buffer_copy(d, buffer(s.data(), x)));
expect(ba.size() == x);
expect(ba.max_size() == sizeof(buf) - x);
expect(buffer_size(ba.data()) == ba.size());
d = ba.prepare(x); expect(buffer_size(d) == x);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(z); expect(buffer_size(d) == z);
d = ba.prepare(y); expect(buffer_size(d) == y);
ba.commit(buffer_copy(d, buffer(s.data()+x, y)));
ba.commit(1);
expect(ba.size() == x + y);
expect(ba.max_size() == sizeof(buf) - (x + y));
expect(buffer_size(ba.data()) == ba.size());
d = ba.prepare(x); expect(buffer_size(d) == x);
d = ba.prepare(y); expect(buffer_size(d) == y);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(z); expect(buffer_size(d) == z);
ba.commit(buffer_copy(d, buffer(s.data()+x+y, z)));
ba.commit(2);
expect(ba.size() == x + y + z);
expect(ba.max_size() == 0);
expect(buffer_size(ba.data()) == ba.size());
expect(to_string(ba.data()) == s);
ba.consume(t);
d = ba.prepare(0); expect(buffer_size(d) == 0);
expect(to_string(ba.data()) == s.substr(t, std::string::npos));
ba.consume(u);
expect(to_string(ba.data()) == s.substr(t + u, std::string::npos));
ba.consume(v);
expect(to_string(ba.data()) == "");
ba.consume(1);
d = ba.prepare(0); expect(buffer_size(d) == 0);
try
{
ba.prepare(1);
fail();
}
catch(...)
{
pass();
}
}
}}}}}}
}
void testConsuming()
{
using boost::asio::buffer;
using boost::asio::const_buffer;
char buf[12];
std::string const s = "Hello, world";
expect(s.size() == sizeof(buf));
buffer_copy(buffer(buf), buffer(s));
expect(to_string(buffer(buf)) == s);
for(std::size_t i = 1; i < 4; ++i) {
for(std::size_t j = 1; j < 4; ++j) {
for(std::size_t x = 1; x < 4; ++x) {
for(std::size_t y = 1; y < 4; ++y) {
std::size_t k = sizeof(buf) - (i + j);
std::size_t z = sizeof(buf) - (x + y);
{
std::array<const_buffer, 3> bs{{
const_buffer{&buf[0], i},
const_buffer{&buf[i], j},
const_buffer{&buf[i+j], k}}};
consuming_buffers<decltype(bs)> cb(bs);
expect(to_string(cb) == s);
cb.consume(0);
expect(to_string(cb) == s);
cb.consume(x);
expect(to_string(cb) == s.substr(x));
cb.consume(y);
expect(to_string(cb) == s.substr(x+y));
cb.consume(z);
expect(to_string(cb) == "");
cb.consume(1);
expect(to_string(cb) == "");
}
}}}}
}
void testStaticBuffers()
{
using boost::asio::buffer;
using boost::asio::buffer_cast;
using boost::asio::buffer_size;
char buf[12];
std::string const s = "Hello, world";
expect(s.size() == sizeof(buf));
for(std::size_t i = 1; i < 4; ++i) {
for(std::size_t j = 1; j < 4; ++j) {
for(std::size_t x = 1; x < 4; ++x) {
for(std::size_t y = 1; y < 4; ++y) {
for(std::size_t t = 1; t < 4; ++ t) {
for(std::size_t u = 1; u < 4; ++ u) {
std::size_t z = sizeof(buf) - (x + y);
std::size_t v = sizeof(buf) - (t + u);
{
std::memset(buf, 0, sizeof(buf));
static_streambuf_n<sizeof(buf)> ba;
decltype(ba)::mutable_buffers_type d;
d = ba.prepare(z); expect(buffer_size(d) == z);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(y); expect(buffer_size(d) == y);
d = ba.prepare(x); expect(buffer_size(d) == x);
ba.commit(buffer_copy(d, buffer(s.data(), x)));
expect(ba.size() == x);
expect(buffer_size(ba.data()) == ba.size());
d = ba.prepare(x); expect(buffer_size(d) == x);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(z); expect(buffer_size(d) == z);
d = ba.prepare(y); expect(buffer_size(d) == y);
ba.commit(buffer_copy(d, buffer(s.data()+x, y)));
ba.commit(1);
expect(ba.size() == x + y);
expect(buffer_size(ba.data()) == ba.size());
d = ba.prepare(x); expect(buffer_size(d) == x);
d = ba.prepare(y); expect(buffer_size(d) == y);
d = ba.prepare(0); expect(buffer_size(d) == 0);
d = ba.prepare(z); expect(buffer_size(d) == z);
ba.commit(buffer_copy(d, buffer(s.data()+x+y, z)));
ba.commit(2);
expect(ba.size() == x + y + z);
expect(buffer_size(ba.data()) == ba.size());
expect(to_string(ba.data()) == s);
ba.consume(t);
d = ba.prepare(0); expect(buffer_size(d) == 0);
expect(to_string(ba.data()) == s.substr(t, std::string::npos));
ba.consume(u);
expect(to_string(ba.data()) == s.substr(t + u, std::string::npos));
ba.consume(v);
expect(to_string(ba.data()) == "");
ba.consume(1);
d = ba.prepare(0); expect(buffer_size(d) == 0);
try
{
ba.prepare(1);
fail();
}
catch(...)
{
pass();
}
}
}}}}}}
}
void testAppendBuffers()
{
using boost::asio::buffer_size;
using boost::asio::const_buffer;
char buf[10];
std::list<const_buffer> b1;
std::vector<const_buffer> b2{
const_buffer{buf+0, 1},
const_buffer{buf+1, 2}};
std::list<const_buffer> b3;
std::array<const_buffer, 3> b4{{
const_buffer{buf+3, 1},
const_buffer{buf+4, 2},
const_buffer{buf+6, 3}}};
std::list<const_buffer> b5{
const_buffer{buf+9, 1}};
std::list<const_buffer> b6;
auto bs = append_buffers(
b1, b2, b3, b4, b5, b6);
expect(buffer_size(bs) == 10);
std::vector<const_buffer> v;
for(auto iter = std::make_reverse_iterator(bs.end());
iter != std::make_reverse_iterator(bs.begin()); ++iter)
v.emplace_back(*iter);
expect(buffer_size(bs) == 10);
decltype(bs) bs2(bs);
auto bs3(std::move(bs));
bs = bs2;
bs3 = std::move(bs2);
{
streambuf sb1, sb2;
expect(buffer_size(append_buffers(
sb1.prepare(5), sb2.prepare(7))) == 12);
sb1.commit(5);
sb2.commit(7);
expect(buffer_size(append_buffers(
sb1.data(), sb2.data())) == 12);
}
}
void testClipBuffers()
{
using boost::asio::const_buffer;
std::string const s = "Hello, world";
expect(s.size() == 12);
for(std::size_t x = 1; x < 4; ++x) {
for(std::size_t y = 1; y < 4; ++y) {
std::size_t z = s.size() - (x + y);
{
std::array<const_buffer, 3> bs{{
const_buffer{&s[0], x},
const_buffer{&s[x], y},
const_buffer{&s[x+y], z}}};
for(std::size_t i = 0; i <= s.size() + 1; ++i)
expect(to_string(prepare_buffers(i, bs)) ==
s.substr(0, i));
}
}}
}
void run() override
{
testStreambuf();
testBuffersAdapter();
testConsuming();
testStaticBuffers();
testAppendBuffers();
testClipBuffers();
}
};
BEAST_DEFINE_TESTSUITE(buffers,asio,beast);
} // test
} // beast
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