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var RarityMap = require('../lib/rarity-map')
var BitField = require('bitfield')
var Swarm = require('bittorrent-swarm')
var EventEmitter = require('events').EventEmitter
var test = require('tape')
var hat = require('hat')
var infoHash = 'd2474e86c95b19b8bcfdb92bc12c9d44667cfa36'
var peerId1 = '-WW0001-' + hat(48)
test('Rarity map usage', function (t) {
t.plan(16)
var swarm = new Swarm(infoHash, peerId1)
var numPieces = 4
swarm.wires = [ new EventEmitter(), new EventEmitter() ]
swarm.wires.forEach(function (wire) {
wire.peerPieces = new BitField(numPieces)
})
var rarityMap = new RarityMap(swarm, numPieces)
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)
}
// test initial / empty case
validateInitial()
rarityMap.recalculate()
// test initial / empty case after recalc
validateInitial()
function setPiece (wire, index) {
wire.peerPieces.set(index)
wire.emit('have', index)
}
setPiece(swarm.wires[0], 0)
setPiece(swarm.wires[1], 0)
setPiece(swarm.wires[0], 1)
setPiece(swarm.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)
function addWire () {
var wire = new EventEmitter()
wire.peerPieces = new BitField(numPieces)
wire.peerPieces.set(1)
wire.peerPieces.set(2)
swarm.wires.push(wire)
swarm.emit('wire', wire)
}
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)
function removeWire (index) {
var wire = swarm.wires.splice(index, 1)[0]
wire.emit('close')
}
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)
})
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