premiere-libtorrent/test/test_piece_picker.cpp

250 lines
7.9 KiB
C++

#include "libtorrent/piece_picker.hpp"
#include "test.hpp"
using namespace libtorrent;
int test_main()
{
using namespace libtorrent;
{
const int num_pieces = 6;
// 4 blocks per piece
const int blocks_per_piece = 4;
piece_picker p(blocks_per_piece
, num_pieces * blocks_per_piece);
// we have the first piece
std::vector<bool> have(num_pieces, false);
have[0] = true;
std::vector<piece_picker::downloading_piece> unfinished;
piece_picker::downloading_piece partial;
piece_picker::block_info blocks[blocks_per_piece * num_pieces];
partial.index = 1;
partial.info = blocks;
partial.info[0].state = piece_picker::block_info::state_finished;
partial.info[2].state = piece_picker::block_info::state_finished;
unfinished.push_back(partial);
std::vector<int> verify_pieces;
p.files_checked(have, unfinished, verify_pieces);
TEST_CHECK(p.is_finished(piece_block(1, 0)));
TEST_CHECK(p.is_finished(piece_block(1, 2)));
p.set_piece_priority(4, 0);
TEST_CHECK(p.piece_priority(4) == 0);
TEST_CHECK(p.piece_priority(3) == 1);
p.set_piece_priority(3, 0);
TEST_CHECK(p.piece_priority(3) == 0);
p.set_piece_priority(3, 1);
TEST_CHECK(p.piece_priority(3) == 1);
TEST_CHECK(p.num_filtered() == 1);
TEST_CHECK(p.num_have_filtered() == 0);
std::vector<int> piece_priorities;
p.piece_priorities(piece_priorities);
int expected1[] = {1, 1, 1, 1, 0, 1};
TEST_CHECK(std::equal(piece_priorities.begin()
, piece_priorities.end(), expected1));
std::vector<bool> peer1(num_pieces, false);
std::vector<bool> peer2(num_pieces, false);
std::vector<bool> peer3(num_pieces, false);
peer1[2] = true;
p.inc_refcount(2);
peer1[3] = true;
peer2[3] = true;
p.inc_refcount(3);
p.inc_refcount(3);
peer1[4] = true;
peer2[4] = true;
peer3[4] = true;
p.inc_refcount(4);
p.inc_refcount(4);
p.inc_refcount(4);
peer1[5] = true;
peer2[5] = true;
peer3[5] = true;
p.inc_refcount(5);
p.inc_refcount(5);
p.inc_refcount(5);
// status for each piece:
// 0: we have it
// 1: we have block 0 and 2
// 2: one peer has it
// 3: two peers have it
// 4: this piece is filtered so it should never be picked
// 5: three peers have it
// Now, we pick one block from peer1. The block is
// is supposed to be picked from piece 2 since it is
// the rarest piece.
std::vector<piece_block> picked;
picked.clear();
p.pick_pieces(peer1, picked, 1, false, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 1);
TEST_CHECK(picked.front().piece_index == 2);
// now pick a piece from peer2. The block is supposed to be
// from piece 3, since it is the rarest piece that peer has.
picked.clear();
p.pick_pieces(peer2, picked, 1, false, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 1);
TEST_CHECK(picked.front().piece_index == 3);
// same thing for peer3.
picked.clear();
p.pick_pieces(peer3, picked, 1, false, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 1);
TEST_CHECK(picked.front().piece_index == 5);
// now, if all peers would have piece 1 (the piece we have partially)
// it should be prioritized over picking a completely new piece.
peer3[1] = true;
p.inc_refcount(1);
picked.clear();
p.pick_pieces(peer3, picked, 1, false, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 1);
TEST_CHECK(picked.front().piece_index == 1);
// and the block picked should not be 0 or 2
// since we already have those blocks
TEST_CHECK(picked.front().block_index != 0);
TEST_CHECK(picked.front().block_index != 2);
// now, if we mark piece 1 and block 0 in piece 2
// as being downloaded and picks a block from peer1,
// it should pick a block from piece 2. But since
// block 0 is marked as requested from another peer,
// the piece_picker will continue to pick blocks
// until it can return at least 1 block (since we
// tell it we want one block) that is not being
// downloaded from anyone else. This is to make it
// possible for us to determine if we want to request
// the block from more than one peer.
// Both piece 1 and 2 are partial pieces, but pice
// 2 is the rarest, so that's why it is picked.
// we have block 0 and 2 already, so we can't mark
// them as begin downloaded.
p.mark_as_downloading(piece_block(1, 1), tcp::endpoint(
address::from_string("1.1.1.1"), 0), piece_picker::fast);
p.mark_as_downloading(piece_block(1, 3), tcp::endpoint(
address::from_string("1.1.1.1"), 0), piece_picker::fast);
p.mark_as_downloading(piece_block(2, 0), tcp::endpoint(
address::from_string("1.1.1.1"), 0), piece_picker::fast);
std::vector<piece_picker::downloading_piece> const& downloads = p.get_download_queue();
TEST_CHECK(downloads.size() == 2);
TEST_CHECK(downloads[0].index == 1);
TEST_CHECK(downloads[0].info[0].state == piece_picker::block_info::state_finished);
TEST_CHECK(downloads[0].info[1].state == piece_picker::block_info::state_requested);
TEST_CHECK(downloads[0].info[2].state == piece_picker::block_info::state_finished);
TEST_CHECK(downloads[0].info[3].state == piece_picker::block_info::state_requested);
TEST_CHECK(downloads[1].index == 2);
TEST_CHECK(downloads[1].info[0].state == piece_picker::block_info::state_requested);
TEST_CHECK(downloads[1].info[1].state == piece_picker::block_info::state_none);
TEST_CHECK(downloads[1].info[2].state == piece_picker::block_info::state_none);
TEST_CHECK(downloads[1].info[3].state == piece_picker::block_info::state_none);
TEST_CHECK(p.is_requested(piece_block(1, 1)));
TEST_CHECK(p.is_requested(piece_block(1, 3)));
TEST_CHECK(p.is_requested(piece_block(2, 0)));
TEST_CHECK(!p.is_requested(piece_block(2, 1)));
picked.clear();
p.pick_pieces(peer1, picked, 1, false, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 2);
piece_block expected3[] = { piece_block(2, 0), piece_block(2, 1) };
TEST_CHECK(std::equal(picked.begin()
, picked.end(), expected3));
// now, if we assume we're downloading at such a speed that
// we might prefer to download whole pieces at a time from
// this peer. It should not pick piece 1 or 2 (since those are
// partially selected)
picked.clear();
p.pick_pieces(peer1, picked, 1, true, tcp::endpoint(), piece_picker::fast);
// it will pick 4 blocks, since we said we
// wanted whole pieces.
TEST_CHECK(picked.size() == 4);
piece_block expected4[] =
{
piece_block(3, 0), piece_block(3, 1)
, piece_block(3, 2), piece_block(3, 3)
};
TEST_CHECK(std::equal(picked.begin()
, picked.end(), expected4));
// now, try the same thing, but pick as many pieces as possible
// to make sure it can still fall back on partial pieces
picked.clear();
p.pick_pieces(peer1, picked, 100, true, tcp::endpoint(), piece_picker::fast);
TEST_CHECK(picked.size() == 12);
piece_block expected5[] =
{
piece_block(3, 0), piece_block(3, 1)
, piece_block(3, 2), piece_block(3, 3)
, piece_block(5, 0), piece_block(5, 1)
, piece_block(5, 2), piece_block(5, 3)
, piece_block(2, 0), piece_block(2, 1)
, piece_block(2, 2), piece_block(2, 3)
};
TEST_CHECK(std::equal(picked.begin()
, picked.end(), expected5));
// now, try the same thing, but pick as many pieces as possible
// to make sure it can still fall back on partial pieces
picked.clear();
p.pick_pieces(peer1, picked, 100, true
, tcp::endpoint(address::from_string("1.1.1.1"), 0), piece_picker::fast);
TEST_CHECK(picked.size() == 11);
piece_block expected6[] =
{
piece_block(2, 1), piece_block(2, 2)
, piece_block(2, 3)
, piece_block(3, 0), piece_block(3, 1)
, piece_block(3, 2), piece_block(3, 3)
, piece_block(5, 0), piece_block(5, 1)
, piece_block(5, 2), piece_block(5, 3)
};
TEST_CHECK(std::equal(picked.begin()
, picked.end(), expected6));
// make sure the piece picker allows filtered pieces
// to become available
p.mark_as_finished(piece_block(4, 2), tcp::endpoint());
}
return 0;
}