продолжаем вносить все

lib/peer-queue.js

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+'use strict';
+
+var PeerQueue = function (maxSize, perLimit) {
+    this.maxSize = maxSize || 200;
+    this.perLimit = perLimit || 10;
+    this.peers = {};
+    this.reqs = [];
+};
+
+PeerQueue.prototype._shift = function () {
+    if (this.length() > 0) {
+        var req = this.reqs.shift();
+        this.peers[req.infohash.toString('hex')] = [];
+        return req;
+    }
+};
+
+PeerQueue.prototype.push = function (peer) {
+    var infohashHex = peer.infohash.toString('hex');
+    var peers = this.peers[infohashHex];
+
+    if (peers && peers.length < this.perLimit) {
+        peers.push(peer);
+    }
+    else if (this.length() < this.maxSize) {
+        this.reqs.push(peer);
+    }
+};
+
+PeerQueue.prototype.shift = function (infohash, successful) {
+    if (infohash) {
+        var infohashHex = infohash.toString('hex');
+        if (successful === true) {
+            delete this.peers[infohashHex];
+        }
+        else {
+            var peers = this.peers[infohashHex];
+            if (peers) {
+                if (peers.length > 0) {
+                    return peers.shift();
+                }
+                else {
+                    delete this.peers[infohashHex];
+                }
+            }
+        }
+    }
+    return this._shift();
+};
+
+PeerQueue.prototype.length = function () {
+    return this.reqs.length;
+};
+
+module.exports = PeerQueue;