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const fixtures = require('webtorrent-fixtures')
const randombytes = require('randombytes')
const test = require('tape')
const Wire = require('bittorrent-protocol')
const Torrent = require('../lib/torrent.js')
test('Rarity map usage', t => {
t.plan(16)
const numPieces = 4
const torrentId = Object.assign({}, fixtures.numbers.parsedTorrent, {
pieces: Array(numPieces)
})
const client = {
listening: true,
peerId: randombytes(20).toString('hex'),
torrentPort: 6889,
dht: false,
tracker: false,
lsd: false,
_remove () {}
}
const opts = {}
const torrent = new Torrent(torrentId, client, opts)
torrent.on('metadata', () => {
torrent._onWire(new Wire())
torrent._onWire(new Wire())
const rarityMap = torrent._rarityMap
// test initial / empty case
validateInitial()
rarityMap.recalculate()
// test initial / empty case after recalc
validateInitial()
setPiece(torrent.wires[0], 0)
setPiece(torrent.wires[1], 0)
setPiece(torrent.wires[0], 1)
setPiece(torrent.wires[1], 3)
// test rarest piece after setting pieces and handling 'have' events
let piece = rarityMap.getRarestPiece()
t.equal(piece, 2)
rarityMap.recalculate()
// test rarest piece after recalc to ensure its the same
piece = rarityMap.getRarestPiece()
t.equal(piece, 2)
addWire()
addWire()
// test rarest piece after adding wires
piece = rarityMap.getRarestPiece()
t.equal(piece, 3)
rarityMap.recalculate()
// test rarest piece after adding wires and recalc
piece = rarityMap.getRarestPiece()
t.equal(piece, 3)
removeWire(3)
removeWire(1)
// test rarest piece after removing wires
piece = rarityMap.getRarestPiece()
t.equal(piece, 3)
rarityMap.recalculate()
// test rarest piece after removing wires and recalc
piece = rarityMap.getRarestPiece()
t.equal(piece, 3)
// test piece filter func
piece = rarityMap.getRarestPiece(i => i <= 1)
t.equal(piece, 0)
piece = rarityMap.getRarestPiece(i => i === 1 || i === 2)
t.equal(piece, 2)
function validateInitial () {
// note that getRarestPiece will return a random piece since they're all equal
// so repeat the test several times to reasonably ensure its correctness.
let piece = rarityMap.getRarestPiece()
t.ok(piece >= 0 && piece < numPieces)
piece = rarityMap.getRarestPiece()
t.ok(piece >= 0 && piece < numPieces)
piece = rarityMap.getRarestPiece()
t.ok(piece >= 0 && piece < numPieces)
piece = rarityMap.getRarestPiece()
t.ok(piece >= 0 && piece < numPieces)
}
function setPiece (wire, index) {
wire.peerPieces.set(index)
wire.emit('have', index)
}
function addWire () {
const wire = new Wire()
wire.peerPieces.set(1)
wire.peerPieces.set(2)
torrent._onWire(wire)
}
function removeWire (index) {
const wire = torrent.wires.splice(index, 1)[0]
wire.destroy()
}
})
t.on('end', () => {
torrent.wires.forEach(wire => {
wire.destroy()
})
torrent.destroy()
})
})
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