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var extend = require('xtend')
var fixtures = require('webtorrent-fixtures')
var hat = require('hat')
var test = require('tape')
var Torrent = require('../lib/torrent')
var Wire = require('bittorrent-protocol')
test('Rarity map usage', function (t) {
t.plan(16)
var numPieces = 4
var torrentId = extend(fixtures.numbers.parsedTorrent, {
pieces: Array(numPieces)
})
var client = {
listening: true,
peerId: hat(160),
torrentPort: 6889,
dht: false,
tracker: false,
remove: function () {}
}
var opts = {}
var torrent = new Torrent(torrentId, client, opts)
torrent.on('metadata', function () {
torrent._onWire(new Wire())
torrent._onWire(new Wire())
var 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
var 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(function (i) { return i <= 1 })
t.equal(piece, 0)
piece = rarityMap.getRarestPiece(function (i) { return 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.
var 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 () {
var wire = new Wire()
wire.peerPieces.set(1)
wire.peerPieces.set(2)
torrent._onWire(wire)
}
function removeWire (index) {
var wire = torrent.wires.splice(index, 1)[0]
wire.destroy()
}
})
t.on('end', function () {
torrent.wires.forEach(function (wire) {
wire.destroy()
})
torrent.destroy()
})
})
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