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test_piece_picker.cpp
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/*
Copyright (c) 2005, 2007-2010, 2012-2020, Arvid Norberg
Copyright (c) 2016, Andrei Kurushin
Copyright (c) 2016, 2018, 2020, Alden Torres
Copyright (c) 2019, Steven Siloti
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/piece_picker.hpp"
#include "libtorrent/torrent_peer.hpp"
#include "libtorrent/bitfield.hpp"
#include "libtorrent/performance_counters.hpp"
#include "libtorrent/random.hpp"
#include "libtorrent/units.hpp"
#include <memory>
#include <functional>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <iostream>
#include "test.hpp"
#include "test_utils.hpp"
using namespace lt;
using namespace std::placeholders;
namespace {
const int blocks_per_piece = 4;
const int default_piece_size = blocks_per_piece * default_block_size;
typed_bitfield<piece_index_t> string2vec(char const* have_str)
{
const int num_pieces = int(strlen(have_str));
typed_bitfield<piece_index_t> have(num_pieces, false);
for (auto i = 0_piece; i < have.end_index(); ++i)
if (have_str[static_cast<int>(i)] != ' ') have.set_bit(i);
return have;
}
tcp::endpoint endp;
ipv4_peer tmp0(endp, false, {});
ipv4_peer tmp1(endp, false, {});
ipv4_peer tmp2(endp, false, {});
ipv4_peer tmp3(endp, false, {});
ipv4_peer tmp4(endp, false, {});
ipv4_peer tmp5(endp, false, {});
ipv4_peer tmp6(endp, false, {});
ipv4_peer tmp7(endp, false, {});
ipv4_peer tmp8(endp, false, {});
ipv4_peer tmp9(endp, false, {});
ipv4_peer peer_struct(endp, true, {});
ipv4_peer* tmp_peer = &tmp1;
static std::vector<piece_index_t> const empty_vector;
#if TORRENT_USE_ASSERTS
namespace { // TODO: remove the nested namespace
static struct initializer
{
initializer()
{
tmp0.in_use = true;
tmp1.in_use = true;
tmp2.in_use = true;
tmp3.in_use = true;
tmp4.in_use = true;
tmp5.in_use = true;
tmp6.in_use = true;
tmp7.in_use = true;
tmp8.in_use = true;
tmp9.in_use = true;
peer_struct.in_use = true;
}
} initializer_dummy;
}
#endif
// availability is a string where each character is the
// availability of that piece, '1', '2' etc.
// have_str is a string where each character represents a
// piece, ' ' means we don't have the piece and any other
// character means we have it
std::shared_ptr<piece_picker> setup_picker(
char const* availability
, char const* have_str
, char const* priority
, char const* partial
, int const piece_size = default_piece_size)
{
const int num_pieces = int(strlen(availability));
TORRENT_ASSERT(int(strlen(have_str)) == num_pieces);
auto p = std::make_shared<piece_picker>(
std::int64_t(num_pieces) * piece_size, piece_size);
for (auto i = 0_piece; i < piece_index_t(num_pieces); ++i)
{
const int avail = availability[static_cast<int>(i)] - '0';
assert(avail >= 0);
static const torrent_peer* peers[10] = { &tmp0, &tmp1, &tmp2
, &tmp3, &tmp4, &tmp5, &tmp6, &tmp7, &tmp8, &tmp9 };
TORRENT_ASSERT(avail < 10);
for (int j = 0; j < avail; ++j) p->inc_refcount(i, peers[j]);
}
auto have = string2vec(have_str);
for (auto i = 0_piece; i < have.end_index(); ++i)
{
int const idx = static_cast<int>(i);
if (partial[idx] == 0) break;
if (partial[idx] == ' ') continue;
int blocks = 0;
if (partial[idx] >= '0' && partial[idx] <= '9')
blocks = partial[idx] - '0';
else
blocks = partial[idx] - 'a' + 10;
int counter = 0;
for (int j = 0; j < 4; ++j)
{
TEST_CHECK(!p->is_finished(piece_block(i, j)));
if ((blocks & (1 << j)) == 0) continue;
++counter;
bool ret = p->mark_as_downloading(piece_block(i, j), tmp_peer);
TEST_CHECK(ret == true);
TEST_CHECK(p->is_requested(piece_block(i, j)) == ((blocks & (1 << j)) != 0));
p->mark_as_writing(piece_block(i, j), tmp_peer);
TEST_CHECK(!p->is_finished(piece_block(i, j)));
// trying to mark a block as requested after it has been completed
// should fail (return false)
ret = p->mark_as_downloading(piece_block(i, j), tmp_peer);
TEST_CHECK(ret == false);
p->mark_as_finished(piece_block(i, j), tmp_peer);
TEST_CHECK(p->is_downloaded(piece_block(i, j)) == ((blocks & (1 << j)) != 0));
TEST_CHECK(p->is_finished(piece_block(i, j)) == ((blocks & (1 << j)) != 0));
}
piece_picker::downloading_piece st;
p->piece_info(i, st);
TEST_EQUAL(int(st.writing), 0);
TEST_EQUAL(int(st.requested), 0);
TEST_EQUAL(int(st.index), idx);
TEST_EQUAL(st.finished, counter);
TEST_EQUAL(st.finished + st.requested + st.writing, counter);
TEST_CHECK(p->is_piece_finished(i) == (counter == 4));
}
for (auto i = 0_piece; i < piece_index_t(num_pieces); ++i)
{
int const idx = static_cast<int>(i);
if (priority[idx] == 0) break;
download_priority_t const prio((priority[idx] - '0') & 0xff);
p->set_piece_priority(i, prio);
TEST_CHECK(p->piece_priority(i) == prio);
}
for (auto i = 0_piece; i < piece_index_t(num_pieces); ++i)
{
if (!have[i]) continue;
p->we_have(i);
for (int j = 0; j < blocks_per_piece; ++j)
TEST_CHECK(p->is_finished(piece_block(i, j)));
}
aux::vector<int, piece_index_t> availability_vec;
p->get_availability(availability_vec);
for (auto i = 0_piece; i < piece_index_t(num_pieces); ++i)
{
const int avail = availability[static_cast<int>(i)] - '0';
assert(avail >= 0);
TEST_CHECK(avail == availability_vec[i]);
}
#if TORRENT_USE_INVARIANT_CHECKS
p->check_invariant();
#endif
return p;
}
bool verify_pick(std::shared_ptr<piece_picker> p
, std::vector<piece_block> const& picked, bool allow_multi_blocks = false)
{
#if TORRENT_USE_INVARIANT_CHECKS
p->check_invariant();
#endif
if (!allow_multi_blocks)
{
for (std::vector<piece_block>::const_iterator i = picked.begin()
, end(picked.end()); i != end; ++i)
{
if (p->num_peers(*i) > 0) return false;
}
}
// make sure there are no duplicated
std::set<piece_block> blocks;
std::copy(picked.begin(), picked.end()
, std::insert_iterator<std::set<piece_block>>(blocks, blocks.end()));
std::cout << " verify: " << picked.size() << " " << blocks.size() << std::endl;
return picked.size() == blocks.size();
}
void print_availability(std::shared_ptr<piece_picker> const& p)
{
aux::vector<int, piece_index_t> avail;
p->get_availability(avail);
std::printf("[ ");
for (auto i : avail)
std::printf("%d ", i);
std::printf("]\n");
}
bool verify_availability(std::shared_ptr<piece_picker> const& p, char const* a)
{
aux::vector<int, piece_index_t> avail;
p->get_availability(avail);
for (auto i = avail.begin(), end(avail.end()); i != end; ++i, ++a)
{
if (*a - '0' != *i) return false;
}
return true;
}
void print_pick(std::vector<piece_block> const& picked)
{
for (auto const& p : picked)
{
std::cout << "(" << p.piece_index << ", " << p.block_index << ") ";
}
std::cout << std::endl;
}
std::vector<piece_block> pick_pieces(std::shared_ptr<piece_picker> const& p
, char const* availability
, int num_blocks
, int prefer_contiguous_blocks
, torrent_peer* peer_struct_arg
, picker_options_t const options = piece_picker::rarest_first
, std::vector<piece_index_t> const& suggested_pieces = empty_vector)
{
std::vector<piece_block> picked;
counters pc;
p->pick_pieces(string2vec(availability), picked
, num_blocks, prefer_contiguous_blocks, peer_struct_arg
, options, suggested_pieces, 20, pc);
print_pick(picked);
TEST_CHECK(verify_pick(p, picked));
return picked;
}
piece_index_t test_pick(std::shared_ptr<piece_picker> const& p
, picker_options_t const options = piece_picker::rarest_first)
{
std::vector<piece_block> picked = pick_pieces(p, "*******", 1, 0, nullptr
, options, empty_vector);
if (picked.size() != 1) return piece_index_t(-1);
return picked[0].piece_index;
}
picker_options_t const options = piece_picker::rarest_first;
counters pc;
} // anonymous namespace
TORRENT_TEST(piece_block)
{
piece_index_t const zero(0);
piece_index_t const one(1);
TEST_CHECK(piece_block(zero, 0) != piece_block(zero, 1));
TEST_CHECK(piece_block(zero, 0) != piece_block(one, 0));
TEST_CHECK(!(piece_block(zero, 0) != piece_block(zero, 0)));
TEST_CHECK(!(piece_block(zero, 0) == piece_block(zero, 1)));
TEST_CHECK(!(piece_block(zero, 0) == piece_block(one, 0)));
TEST_CHECK(piece_block(zero, 0) == piece_block(zero, 0));
TEST_CHECK(!(piece_block(zero, 1) < piece_block(zero, 0)));
TEST_CHECK(!(piece_block(one, 0) < piece_block(zero, 0)));
TEST_CHECK(piece_block(zero, 0) < piece_block(zero, 1));
TEST_CHECK(piece_block(zero, 0) < piece_block(one, 0));
TEST_CHECK(!(piece_block(zero, 0) < piece_block(zero, 0)));
TEST_CHECK(!(piece_block(one, 0) < piece_block(one, 0)));
TEST_CHECK(!(piece_block(zero, 1) < piece_block(zero, 1)));
}
TORRENT_TEST(abort_download)
{
// test abort_download
auto p = setup_picker("1111111", " ", "7110000", "");
auto picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
p->abort_download({0_piece, 0}, tmp_peer);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
p->mark_as_downloading({0_piece, 0}, &tmp1);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == true);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) == picked.end());
p->abort_download({0_piece, 0}, tmp_peer);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
p->mark_as_downloading({0_piece, 0}, &tmp1);
p->mark_as_downloading({0_piece, 1}, &tmp1);
p->abort_download({0_piece, 0}, tmp_peer);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
p->mark_as_downloading({0_piece, 0}, &tmp1);
p->mark_as_writing({0_piece, 0}, &tmp1);
p->write_failed({0_piece, 0});
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(1_piece, 0)) != picked.end()
|| std::find(picked.begin(), picked.end(), piece_block(2_piece, 0)) != picked.end());
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) == picked.end());
p->restore_piece(0_piece);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
p->mark_as_downloading({0_piece, 0}, &tmp1);
p->mark_as_writing({0_piece, 0}, &tmp1);
p->mark_as_finished({0_piece, 0}, &tmp1);
p->abort_download({0_piece, 0}, tmp_peer);
picked = pick_pieces(p, "*******", blocks_per_piece, 0, tmp_peer
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) == picked.end());
}
TORRENT_TEST(abort_download2)
{
auto p = setup_picker("1111111", " ", "7110000", "");
piece_picker::downloading_piece st;
p->mark_as_downloading({0_piece, 0}, &tmp1);
p->mark_as_finished({0_piece, 1}, nullptr);
p->piece_info(0_piece, st);
TEST_EQUAL(st.requested, 1);
TEST_EQUAL(st.finished, 1);
p->abort_download({0_piece, 0}, tmp_peer);
p->piece_info(0_piece, st);
TEST_EQUAL(st.requested, 0);
TEST_EQUAL(st.finished, 1);
auto picked = pick_pieces(p, "*******", blocks_per_piece, 0, nullptr
, options, empty_vector);
TEST_CHECK(p->is_requested({0_piece, 0}) == false);
TEST_CHECK(std::find(picked.begin(), picked.end(), piece_block(0_piece, 0)) != picked.end());
}
TORRENT_TEST(get_downloaders)
{
auto p = setup_picker("1111111", " ", "7110000", "");
p->mark_as_downloading({0_piece, 2}, &tmp1);
p->mark_as_writing({0_piece, 2}, &tmp1);
p->abort_download({0_piece, 2}, &tmp1);
p->mark_as_downloading({0_piece, 2}, &tmp2);
p->mark_as_writing({0_piece, 2}, &tmp2);
{
std::vector<torrent_peer*> d = p->get_downloaders(0_piece);
TEST_EQUAL(d.size(), 4);
TEST_CHECK(d[0] == nullptr);
TEST_CHECK(d[1] == nullptr);
TEST_CHECK(d[2] == &tmp2);
TEST_CHECK(d[3] == nullptr);
}
p->mark_as_downloading({0_piece, 3}, &tmp1);
p->abort_download({0_piece, 3}, &tmp1);
p->mark_as_downloading({0_piece, 3}, &tmp2);
p->mark_as_writing({0_piece, 3}, &tmp2);
{
std::vector<torrent_peer*> d = p->get_downloaders(0_piece);
TEST_EQUAL(d.size(), 4);
TEST_CHECK(d[0] == nullptr);
TEST_CHECK(d[1] == nullptr);
TEST_CHECK(d[2] == &tmp2);
TEST_CHECK(d[3] == &tmp2);
}
// if we ask for downloaders for a piece that's not
// curently being downloaded, we get zeroes back
{
std::vector<torrent_peer*> d = p->get_downloaders(1_piece);
TEST_EQUAL(d.size(), 4);
TEST_CHECK(d[0] == nullptr);
TEST_CHECK(d[1] == nullptr);
TEST_CHECK(d[2] == nullptr);
TEST_CHECK(d[3] == nullptr);
}
// ========================================================
p = setup_picker("2222", " ", "", "");
for (auto i = 0_piece; i < 4_piece; ++i)
for (int k = 0; k < blocks_per_piece; ++k)
p->mark_as_downloading(piece_block(i, k), &tmp1);
p->mark_as_downloading({0_piece, 0}, &tmp2);
std::printf("num_peers: %d\n", p->num_peers({0_piece, 0}));
TEST_EQUAL(p->num_peers({0_piece, 0}), 2);
p->abort_download({0_piece, 0}, &tmp1);
std::printf("num_peers: %d\n", p->num_peers({0_piece, 0}));
TEST_EQUAL(p->num_peers({0_piece, 0}), 1);
}
TORRENT_TEST(pick_lowest_availability)
{
// make sure the block that is picked is from piece 1, since it
// it is the piece with the lowest availability
auto p = setup_picker("2223333", "* * * ", "", "");
TEST_CHECK(test_pick(p) == 1_piece);
}
TORRENT_TEST(random_pick_at_same_priority)
{
// make sure pieces with equal priority and availability
// are picked at random
std::map<piece_index_t, int> random_prio_pieces;
for (int i = 0; i < 100; ++i)
{
auto p = setup_picker("1111112", " ", "", "");
++random_prio_pieces[test_pick(p)];
}
TEST_CHECK(random_prio_pieces.size() == 6);
for (auto i = random_prio_pieces.begin()
, end(random_prio_pieces.end()); i != end; ++i)
std::cout << static_cast<int>(i->first) << ": " << i->second << " ";
std::cout << std::endl;
}
TORRENT_TEST(pick_highest_priority)
{
// make sure the block that is picked is from piece 5, since it
// has the highest priority among the available pieces
auto p = setup_picker("1111111", " ", "1111121", "");
TEST_CHECK(test_pick(p) == 5_piece);
p = setup_picker("1111111", " ", "1171121", "");
TEST_CHECK(test_pick(p) == 2_piece);
p = setup_picker("1111111", " ", "1131521", "");
TEST_CHECK(test_pick(p) == 4_piece);
}
TORRENT_TEST(reverse_rarest_first)
{
auto p = setup_picker("4179253", " ", "", "");
auto picked = pick_pieces(p, "*******", 7 * blocks_per_piece, 0, &peer_struct
, piece_picker::rarest_first | piece_picker::reverse, empty_vector);
int expected_common_pieces[] = {3, 2, 5, 0, 6, 4, 1};
for (int i = 0; i < int(picked.size()); ++i)
{
TEST_CHECK(picked[std::size_t(i)] == piece_block(piece_index_t(
expected_common_pieces[i / blocks_per_piece])
, i % blocks_per_piece));
}
// piece 3 should NOT be prioritized since it's a partial, and not
// reversed. Reversed partials are considered reversed
p = setup_picker("1122111", " ", "3333333", " 1 ");
TEST_CHECK(test_pick(p, piece_picker::rarest_first | piece_picker::reverse)
== 2_piece);
}
TORRENT_TEST(pick_whole_pieces)
{
// make sure the 4 blocks are picked from the same piece if
// whole pieces are preferred. Priority and availability is more
// important. Piece 1 has the lowest availability even though
// it is not a whole piece
auto p = setup_picker("2212222", " ", "1111111", "1023460");
auto picked = pick_pieces(p, "****** ", 1, blocks_per_piece
, &peer_struct, options, empty_vector);
TEST_EQUAL(int(picked.size()), 3);
for (int i = 0; i < blocks_per_piece && i < int(picked.size()); ++i)
TEST_EQUAL(picked[std::size_t(i)].piece_index, 2_piece);
p = setup_picker("1111111", " ", "1111111", "");
picked = pick_pieces(p, "****** ", 1, blocks_per_piece
, &peer_struct, options, empty_vector);
TEST_EQUAL(int(picked.size()), blocks_per_piece);
for (int i = 0; i < blocks_per_piece && i < int(picked.size()); ++i)
TEST_EQUAL(picked[std::size_t(i)].block_index, i);
p = setup_picker("2221222", " ", "", "");
picked = pick_pieces(p, "*******", 1, 7 * blocks_per_piece
, &peer_struct, options, empty_vector);
TEST_EQUAL(int(picked.size()), 7 * blocks_per_piece);
for (int i = 0; i < int(picked.size()); ++i)
TEST_CHECK(picked[std::size_t(i)] == piece_block(piece_index_t(i / blocks_per_piece)
, i % blocks_per_piece));
}
TORRENT_TEST(distributed_copies)
{
// test the distributed copies function. It should include ourself
// in the availability. i.e. piece 0 has availability 2.
// there are 2 pieces with availability 2 and 5 with availability 3
auto p = setup_picker("1233333", "* ", "", "");
auto dc = p->distributed_copies();
TEST_CHECK(dc == std::make_pair(2, 5000 / 7));
}
TORRENT_TEST(filtered_pieces)
{
// make sure filtered pieces are ignored
auto p = setup_picker("1111111", " ", "0010000", "");
TEST_CHECK(test_pick(p, piece_picker::rarest_first) == 2_piece);
TEST_CHECK(test_pick(p, piece_picker::rarest_first | piece_picker::reverse) == 2_piece);
TEST_CHECK(test_pick(p, piece_picker::sequential) == 2_piece);
TEST_CHECK(test_pick(p, piece_picker::sequential | piece_picker::reverse) == 2_piece);
}
TORRENT_TEST(we_dont_have)
{
// make sure we_dont_have works
auto p = setup_picker("1111111", "*******", "0100000", "");
TEST_CHECK(p->have_piece(1_piece));
TEST_CHECK(p->have_piece(2_piece));
p->we_dont_have(1_piece);
p->we_dont_have(2_piece);
TEST_CHECK(!p->have_piece(1_piece));
TEST_CHECK(!p->have_piece(2_piece));
auto picked = pick_pieces(p, "*** ** ", 1, 0, nullptr, options, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front().piece_index == 1_piece);
}
TORRENT_TEST(dec_refcount_split_seed)
{
// make sure we can split m_seed when removing a refcount
auto p = setup_picker("0000000", " ", "0000000", "");
p->inc_refcount_all(nullptr);
aux::vector<int, piece_index_t> avail;
p->get_availability(avail);
TEST_EQUAL(avail.size(), 7);
TEST_CHECK(avail[0_piece] != 0);
TEST_CHECK(avail[1_piece] != 0);
TEST_CHECK(avail[2_piece] != 0);
TEST_CHECK(avail[3_piece] != 0);
TEST_CHECK(avail[4_piece] != 0);
p->dec_refcount(3_piece, nullptr);
p->get_availability(avail);
TEST_EQUAL(avail.size(), 7);
TEST_CHECK(avail[0_piece] != 0);
TEST_CHECK(avail[1_piece] != 0);
TEST_CHECK(avail[2_piece] != 0);
TEST_CHECK(avail[3_piece] == 0);
TEST_CHECK(avail[4_piece] != 0);
}
TORRENT_TEST(resize)
{
// make sure init preserves priorities
auto p = setup_picker("1111111", " ", "1111111", "");
TEST_EQUAL(p->want().num_pieces, 7);
TEST_EQUAL(p->have_want().num_pieces, 0);
TEST_EQUAL(p->have().num_pieces, 0);
p->set_piece_priority(0_piece, dont_download);
TEST_EQUAL(p->want().num_pieces, 6);
TEST_EQUAL(p->have_want().num_pieces, 0);
TEST_EQUAL(p->have().num_pieces, 0);
p->we_have(0_piece);
TEST_EQUAL(p->want().num_pieces, 6);
TEST_EQUAL(p->have_want().num_pieces, 0);
TEST_EQUAL(p->have().num_pieces, 1);
p->resize(28 * default_piece_size, default_piece_size);
TEST_EQUAL(p->piece_priority(0_piece), dont_download);
TEST_EQUAL(p->want().num_pieces, 28 - 1);
TEST_EQUAL(p->have_want().num_pieces, 0);
TEST_EQUAL(p->have().num_pieces, 0);
}
TORRENT_TEST(we_have_all)
{
auto p = setup_picker("0123111", " ** * ", "1234567", " 1234");
p->we_have_all();
TEST_EQUAL(p->want().num_pieces, 7);
TEST_EQUAL(p->want().pad_bytes, 0);
TEST_EQUAL(p->want().last_piece, true);
TEST_EQUAL(p->have_want().num_pieces, 7);
TEST_EQUAL(p->have_want().pad_bytes, 0);
TEST_EQUAL(p->have_want().last_piece, true);
TEST_EQUAL(p->have().num_pieces, 7);
TEST_EQUAL(p->have().pad_bytes, 0);
TEST_EQUAL(p->have().last_piece, true);
}
TORRENT_TEST(dont_pick_requested_blocks)
{
// make sure requested blocks aren't picked
auto p = setup_picker("1111111", " ", "", "");
auto picked = pick_pieces(p, "*******", 1, 0, nullptr, options, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
piece_block first = picked.front();
p->mark_as_downloading(picked.front(), &peer_struct);
TEST_CHECK(p->num_peers(picked.front()) == 1);
picked = pick_pieces(p, "*******", 1, 0, nullptr, options, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() != first);
}
TORRENT_TEST(downloading_piece_priority)
{
// make sure downloading pieces have higher priority
auto p = setup_picker("1111111", " ", "", "");
auto picked = pick_pieces(p, "*******", 1, 0, nullptr, options, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
auto first = picked.front();
p->mark_as_downloading(picked.front(), &peer_struct);
TEST_CHECK(p->num_peers(picked.front()) == 1);
picked = pick_pieces(p, "*******", 1, 0, nullptr, options, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() != first);
TEST_CHECK(picked.front().piece_index == first.piece_index);
}
TORRENT_TEST(partial_piece_order_rarest_first)
{
// when we're prioritizing partial pieces, make sure to first pick the
// rarest of them. The blocks in this test are:
// 0: [ ] avail: 1
// 1: [x ] avail: 1
// 2: [xx ] avail: 1
// 3: [xxx ] avail: 2
// 4: [ ] avail: 1
// 5: [ ] avail: 1
// 6: [xxxx] avail: 1
// piece 6 does not have any blocks left to pick, even though piece 3 only
// has a single block left before it completes, it is less rare than piece
// 2. Piece 2 is the best pick in this case.
auto p = setup_picker("1112111", " ", "", "013700f");
auto picked = pick_pieces(p, "*******", 1, 0, nullptr
, options | piece_picker::prioritize_partials, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() == piece_block(2_piece, 2)
|| picked.front() == piece_block(2_piece, 3));
}
TORRENT_TEST(partial_piece_order_most_complete)
{
// as a tie breaker, make sure downloading pieces closer to completion have
// higher priority. piece 3 is only 1 block from being completed, and should
// be picked
auto p = setup_picker("1111111", " ", "", "013700f");
auto picked = pick_pieces(p, "*******", 1, 0, nullptr
, options | piece_picker::prioritize_partials, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() == piece_block(3_piece, 3));
}
TORRENT_TEST(partial_piece_order_sequential)
{
// if we don't use rarest first when we prioritize partials, but instead use
// sequential order, make sure we pick the right one
auto p = setup_picker("1111111", " ", "", "013700f");
auto picked = pick_pieces(p, "*******", 1, 0, nullptr
, piece_picker::sequential | piece_picker::prioritize_partials, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() == piece_block(1_piece, 1)
|| picked.front() == piece_block(1_piece, 2)
|| picked.front() == piece_block(1_piece, 3));
}
TORRENT_TEST(random_picking_downloading_piece)
{
// make sure the random piece picker can still pick partial pieces
auto p = setup_picker("1111111", " ", "", "013700f");
auto picked = pick_pieces(p, " *** *", 1, 0, nullptr
, {}, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() == piece_block(1_piece, 1)
|| picked.front() == piece_block(2_piece, 2)
|| picked.front() == piece_block(3_piece, 3));
}
TORRENT_TEST(random_picking_downloading_piece_prefer_contiguous)
{
// make sure the random piece picker can still pick partial pieces
// even when prefer_contiguous_blocks is set
auto p = setup_picker("1111111", " ", "", "013700f");
auto picked = pick_pieces(p, " *** *", 1, 4, nullptr
, {}, empty_vector);
TEST_CHECK(int(picked.size()) > 0);
TEST_CHECK(picked.front() == piece_block(1_piece, 1)
|| picked.front() == piece_block(2_piece, 2)
|| picked.front() == piece_block(3_piece, 3));
}
TORRENT_TEST(prefer_contiguous_no_duplicates)
{
// this exercises the case where we expand a piece that we selected (since
// prefer contiguous is 8), but still want to pick more pieces afterwards.
// We make sure we don't pick any of the pieces we expanded into
auto p = setup_picker("1111111", " ", "", "");
auto picked = pick_pieces(p, " *** ", 32, 8, nullptr
, piece_picker::rarest_first, empty_vector);
TEST_EQUAL(int(picked.size()), 3 * blocks_per_piece);
print_pick(picked);
TEST_CHECK(verify_pick(p, picked, true));
}
TORRENT_TEST(prefer_contiguous_suggested)
{
// this exercises the case where we expand a piece that we selected (since
// prefer contiguous > 0) but need to ignore the suggested piece, since it
// was picked first
auto p = setup_picker("1111111", " ", "", "");
std::vector<piece_index_t> const suggested_pieces = { 3_piece };
auto picked = pick_pieces(p, " *** ", 32, 32, nullptr
, piece_picker::rarest_first, suggested_pieces);
TEST_EQUAL(int(picked.size()), 3 * blocks_per_piece);
print_pick(picked);
TEST_CHECK(verify_pick(p, picked, true));
}
TORRENT_TEST(sequential_download)
{
// test sequential download
auto p = setup_picker("7654321", " ", "", "");
auto picked = pick_pieces(p, "*******", 7 * blocks_per_piece, 0, nullptr
, piece_picker::sequential, empty_vector);
TEST_CHECK(int(picked.size()) == 7 * blocks_per_piece);
for (int i = 0; i < int(picked.size()); ++i)
TEST_CHECK(picked[std::size_t(i)] == piece_block(piece_index_t(i / blocks_per_piece)
, i % blocks_per_piece));
}
TORRENT_TEST(reverse_sequential_download)
{
// test reverse sequential download
auto p = setup_picker("7654321", " ", "", "");
auto picked = pick_pieces(p, "*******", 7 * blocks_per_piece, 0, nullptr
, piece_picker::sequential | piece_picker::reverse, empty_vector);
TEST_CHECK(int(picked.size()) == 7 * blocks_per_piece);
for (int i = 0; i < int(picked.size()); ++i)
TEST_CHECK(picked[std::size_t(i)] == piece_block(piece_index_t(6 - (i / blocks_per_piece))
, i % blocks_per_piece));
}
TORRENT_TEST(priority_sequential_download)
{
// test priority sequential download
auto p = setup_picker("7654321", " ", "1117071", "");
auto picked = pick_pieces(p, "*******", 7 * blocks_per_piece, 0, nullptr
, piece_picker::sequential, empty_vector);
// the piece with priority 0 was not picked, everything else should
// be picked
TEST_EQUAL(int(picked.size()), 6 * blocks_per_piece);
// the first two pieces picked should be 3 and 5 since those have priority 7
for (int i = 0; i < 2 * blocks_per_piece; ++i)
TEST_CHECK(picked[std::size_t(i)].piece_index == 3_piece || picked[std::size_t(i)].piece_index == 5_piece);
int expected[] = {-1, -1, 0, 1, 2, 6};
for (int i = 2 * blocks_per_piece; i < int(picked.size()); ++i)
TEST_EQUAL(picked[std::size_t(i)].piece_index, piece_index_t(expected[i / blocks_per_piece]));
}
TORRENT_TEST(cursors_sweep_up_we_have)
{
// sweep up, we_have()
auto p = setup_picker("7654321", " ", "", "");
for (auto i = 0_piece; i < 7_piece; ++i)
{
TEST_EQUAL(p->cursor(), i);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
p->we_have(i);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_up_set_piece_priority)
{
// sweep up, set_piece_priority()
auto p = setup_picker("7654321", " ", "", "");
for (auto i = 0_piece; i < 7_piece; ++i)
{
TEST_EQUAL(p->cursor(), i);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
p->set_piece_priority(i, dont_download);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_down_we_have)
{
// sweep down, we_have()
auto p = setup_picker("7654321", " ", "", "");
for (auto i = 6_piece; i >= 0_piece; --i)
{
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), next(i));
p->we_have(i);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_down_set_piece_priority)
{
// sweep down, set_piece_priority()
auto p = setup_picker("7654321", " ", "", "");
for (auto i = 6_piece; i >= 0_piece; --i)
{
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), next(i));
p->set_piece_priority(i, dont_download);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_in_set_priority)
{
// sweep in, set_piece_priority()
auto p = setup_picker("7654321", " ", "", "");
for (piece_index_t left(0), right(6); left <= 3_piece
&& right >= 3_piece; ++left, --right)
{
TEST_EQUAL(p->cursor(), left);
TEST_EQUAL(p->reverse_cursor(), next(right));
p->set_piece_priority(left, dont_download);
p->set_piece_priority(right, dont_download);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_in_we_have)
{
// sweep in, we_have()
auto p = setup_picker("7654321", " ", "", "");
for (piece_index_t left(0), right(6); left <= 3_piece
&& right >= 3_piece; ++left, --right)
{
TEST_EQUAL(p->cursor(), left);
TEST_EQUAL(p->reverse_cursor(), next(right));
p->we_have(left);
p->we_have(right);
}
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
}
TORRENT_TEST(cursors_sweep_up_we_dont_have)
{
auto p = setup_picker("7654321", "*******", "", "");
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
for (auto i = 0_piece; i < 7_piece; ++i)
{
p->we_dont_have(i);
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), next(i));
}
TEST_CHECK(!p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
}
TORRENT_TEST(cursors_sweep_down_we_dont_have)
{
auto p = setup_picker("7654321", "*******", "", "");
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
for (auto i = 6_piece; i >= 0_piece; --i)
{
p->we_dont_have(i);
TEST_EQUAL(p->cursor(), i);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
}
TEST_CHECK(!p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
}
TORRENT_TEST(cursors_sweep_out_we_dont_have)
{
auto p = setup_picker("7654321", "*******", "", "");
TEST_CHECK(p->is_finished());
TEST_CHECK(p->is_seeding());
TEST_EQUAL(p->cursor(), 7_piece);
TEST_EQUAL(p->reverse_cursor(), 0_piece);
for (auto left = 3_piece, right = 3_piece;
left >= 0_piece && right < 7_piece;
--left, ++right)
{
p->we_dont_have(left);
p->we_dont_have(right);
TEST_EQUAL(p->cursor(), left);
TEST_EQUAL(p->reverse_cursor(), next(right));
}
TEST_CHECK(!p->is_finished());
TEST_CHECK(!p->is_seeding());
TEST_EQUAL(p->cursor(), 0_piece);
TEST_EQUAL(p->reverse_cursor(), 7_piece);
}
TORRENT_TEST(cursors)
{