1 | function spliceOne(list, index) {
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2 | for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
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3 | list[i] = list[k];
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4 | list.pop();
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5 | }
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6 |
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7 | function Manager(interval, streamInterval, kaCountMax) {
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8 | var streams = this._streams = [];
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9 | this._timer = undefined;
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10 | this._timerInterval = interval;
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11 | this._timerfn = function() {
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12 | var now = Date.now();
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13 | for (var i = 0, len = streams.length, s, last; i < len; ++i) {
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14 | s = streams[i];
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15 | last = s._kalast;
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16 | if (last && (now - last) >= streamInterval) {
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17 | if (++s._kacnt > kaCountMax) {
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18 | var err = new Error('Keepalive timeout');
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19 | err.level = 'client-timeout';
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20 | s.emit('error', err);
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21 | s.disconnect();
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22 | spliceOne(streams, i);
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23 | --i;
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24 | len = streams.length;
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25 | } else {
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26 | s._kalast = now;
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27 |
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28 |
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29 |
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30 | s.ping();
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31 | }
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32 | }
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33 | }
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34 | };
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35 | }
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36 |
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37 | Manager.prototype.start = function() {
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38 | if (this._timer)
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39 | this.stop();
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40 | this._timer = setInterval(this._timerfn, this._timerInterval);
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41 | };
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42 |
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43 | Manager.prototype.stop = function() {
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44 | if (this._timer) {
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45 | clearInterval(this._timer);
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46 | this._timer = undefined;
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47 | }
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48 | };
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49 |
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50 | Manager.prototype.add = function(stream) {
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51 | var streams = this._streams,
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52 | self = this;
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53 |
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54 | stream.once('end', function() {
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55 | self.remove(stream);
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56 | }).on('packet', resetKA);
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57 |
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58 | streams[streams.length] = stream;
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59 |
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60 | resetKA();
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61 |
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62 | if (!this._timer)
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63 | this.start();
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64 |
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65 | function resetKA() {
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66 | stream._kalast = Date.now();
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67 | stream._kacnt = 0;
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68 | }
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69 | };
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70 |
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71 | Manager.prototype.remove = function(stream) {
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72 | var streams = this._streams,
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73 | index = streams.indexOf(stream);
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74 | if (index > -1)
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75 | spliceOne(streams, index);
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76 | if (!streams.length)
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77 | this.stop();
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78 | };
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79 |
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80 | module.exports = Manager;
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