torrent_test.go

/*
 * Copyright (c) 2016 Mark Samman </~https://github.com/marksamman/gotorrent>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package main

import (
	"math"
	"sync"
	"testing"
)

func TestUpload(t *testing.T) {
	torrent := Torrent{}
	torrent.open("debian.torrent")

	peer := new(Peer)
	peer.torrent = &torrent
	peer.sendPieceBlockChannel = make(chan *BlockMessage)
	peer.done = make(chan struct{})

	messages := 0
	for index := uint32(0); index < uint32(len(torrent.pieces)); index++ {
		if !torrent.pieces[index].done {
			continue
		}
		pieceLength := peer.torrent.getPieceLength(index)
		blocks := int(math.Ceil(float64(pieceLength) / 16384))
		peer.queue = append(peer.queue, &PeerPiece{index, make([][]byte, blocks), 0, blocks})
		messages += blocks
	}

	var group sync.WaitGroup
	group.Add(1)
	go func() {
		for messages != 0 {
			select {
			case message := <-peer.sendPieceBlockChannel:
				func() {
					idx := 0
					var piece *PeerPiece
					for k, v := range peer.queue {
						if v.index == message.index {
							idx = k
							piece = v
							break
						}
					}

					if piece == nil {
						t.Error("received index we didn't ask for")
						return
					}

					blockIndex := message.begin / 16384
					if int(blockIndex) >= len(piece.blocks) {
						t.Error("received too big block index")
						return
					}

					piece.blocks[blockIndex] = message.block

					piece.writes++
					if piece.writes != piece.reqWrites {
						return
					}

					// Glue all blocks together into a piece
					pieceData := []byte{}
					for k := range piece.blocks {
						pieceData = append(pieceData, piece.blocks[k]...)
					}

					// Verify hash
					if !torrent.checkPieceHash(pieceData, message.index) {
						t.Error("piece hash mismatch")
					}

					// Remove piece from peer
					peer.queue = append(peer.queue[:idx], peer.queue[idx+1:]...)
				}()
			case <-peer.done:
				t.Error("handeBlockRequestMessage failed")
			}
			messages--
		}
		group.Done()
	}()

	for index := uint32(0); index < uint32(len(torrent.pieces)); index++ {
		pieceLength := peer.torrent.getPieceLength(index)
		var pos uint32
		for pieceLength > 16384 {
			torrent.handleBlockRequestMessage(&BlockRequestMessage{peer, index, pos, 16384})
			pieceLength -= 16384
			pos += 16384
		}
		torrent.handleBlockRequestMessage(&BlockRequestMessage{peer, index, pos, uint32(pieceLength)})
	}
	group.Wait()
}