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More experimental support for the streaming API. Now it really works …
…after enabling in the options page.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| var StreamListener = (function() { | ||
|
|
||
| var props = { | ||
| streamReconnectCount: 0, | ||
| streamReconnectBaseTime: 20000, | ||
| streamReconnectWaitTime: this.streamReconnectBaseTime, | ||
| streamMaxStaleTime: 90000, | ||
| streamMaxReconnectWait: 240000 | ||
| }; | ||
|
|
||
| props.subscribers = []; | ||
| props.twitterLib = null; | ||
|
|
||
| var curry = function(func) { | ||
| var slice = Array.prototype.slice, args = slice.call(arguments, 1); | ||
| return function() { | ||
| func.apply(this, args.concat(slice.call(arguments))); | ||
| }; | ||
| }; | ||
|
|
||
| var publish = function(data) { | ||
| if(props.twitterLib) { | ||
| if(data.hasOwnProperty('text')) { | ||
| props.twitterLib.normalizeTweets(data); | ||
| } else if(data.hasOwnProperty('direct_message')) { | ||
| props.twitterLib.normalizeTweets(data.direct_message); | ||
| } | ||
| } | ||
| console.log(data); | ||
| for(var i = 0, len = props.subscribers.length; i < len; ++i) { | ||
| var sub = props.subscribers[i]; | ||
| sub.callback.call(sub.context, data); | ||
| } | ||
| }; | ||
|
|
||
| var publishDisconnect = curry(publish, { | ||
| event: 'disconnected' | ||
| }); | ||
|
|
||
| var xhr, onProgress; | ||
|
|
||
| var stopStream = function() { | ||
| if(!xhr) { | ||
| return; | ||
| } | ||
| xhr.removeEventListener("progress", onProgress, false); | ||
| xhr.abort(); | ||
| }; | ||
|
|
||
| var connectStream = function() { | ||
| if(!OptionsBackend.get('use_streaming_api')) { | ||
| return; | ||
| } | ||
| var MAX_BUFFER = 1024 * 500; | ||
|
|
||
| var url = OptionsBackend.get('user_stream_url'); | ||
| var params = { | ||
| delimited: 'length' | ||
| }; | ||
|
|
||
| props.streamReconnectCount += 1; | ||
| console.log('connecting to stream ', props.streamReconnectCount); | ||
|
|
||
| xhr = new XMLHttpRequest(); | ||
| xhr.open('GET', url + '?' + $.param(params), true); | ||
| xhr.setRequestHeader('X-User-Agent', 'Chromed Bird ' + JSON.parse(Persistence.version().val()).join('.')); | ||
| if(props.twitterLib) { | ||
| props.twitterLib.signOauth(xhr, url, params, 'GET'); | ||
| } | ||
|
|
||
| var lastLoaded = 0, lastChunkLen, lastProgressTime = new Date().getTime(); | ||
| onProgress = function(e) { | ||
| console.log('loaded', e.loaded, 'time', new Date().getTime() - lastProgressTime); | ||
| lastProgressTime = new Date().getTime(); | ||
|
|
||
| var totalLen = e.loaded; | ||
| if(totalLen > MAX_BUFFER) { | ||
| console.log('stream disconnected, buffer too large'); | ||
| stopStream(); | ||
| } | ||
| var data = xhr.responseText; | ||
|
|
||
| while(lastLoaded < totalLen) { | ||
| if(!lastChunkLen) { | ||
| lastChunkLen = ''; | ||
| var curChar = data.charAt(lastLoaded); | ||
| while(curChar != '\n' || lastChunkLen.length === 0) { | ||
| if(curChar.match(/\d/)) { | ||
| lastChunkLen += curChar; | ||
| } | ||
| lastLoaded += 1; | ||
| if(lastLoaded >= totalLen) { | ||
| return; | ||
| } | ||
| curChar = data.charAt(lastLoaded); | ||
| } | ||
| lastLoaded += 1; | ||
| lastChunkLen = parseInt(lastChunkLen, 10); | ||
| } | ||
| if(lastLoaded + lastChunkLen > totalLen) { | ||
| // Let's just wait for the rest of our data | ||
| return; | ||
| } | ||
| var jsonChunk = data.substring(lastLoaded, lastLoaded + lastChunkLen); | ||
| var parsedChunk = JSON.parse(jsonChunk); | ||
| publish(parsedChunk); | ||
| lastLoaded += lastChunkLen; | ||
| lastChunkLen = null; | ||
| } | ||
| }; | ||
|
|
||
| xhr.addEventListener("progress", onProgress, false); | ||
| var intervalHandle; | ||
| xhr.onreadystatechange = function() { | ||
| if(xhr.readyState == 2 && xhr.status == 200) { | ||
| console.log('stream connected ok'); | ||
|
|
||
| var checkStaleConnection = function() { | ||
| var time = new Date().getTime(); | ||
| if(time - lastProgressTime > props.streamMaxStaleTime) { | ||
| console.log('stream stale connection'); | ||
| stopStream(); | ||
| } | ||
| }; | ||
| intervalHandle = setInterval(checkStaleConnection, props.streamMaxStaleTime / 2); | ||
|
|
||
| props.streamReconnectWaitTime = props.streamReconnectBaseTime; | ||
| } else if(xhr.readyState == 4) { | ||
| console.log('stream disconnected', xhr.status, xhr.statusText); | ||
| publishDisconnect(); | ||
| if(intervalHandle) { | ||
| clearInterval(intervalHandle); | ||
| intervalHandle = null; | ||
| } | ||
| if(props.twitterLib) { | ||
| setTimeout(function() { | ||
| connectStream(); | ||
| }, props.streamReconnectWaitTime); | ||
| if(props.streamReconnectWaitTime < props.streamMaxReconnectWait) { | ||
| props.streamReconnectWaitTime *= 2; | ||
| } | ||
| } | ||
| } | ||
| }; | ||
|
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| xhr.send(); | ||
| }; | ||
|
|
||
| return { | ||
| events: { | ||
| DISCONNECTED: 'disconnected' | ||
| }, | ||
|
|
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| start: function(twitterLib) { | ||
| props.twitterLib = twitterLib; | ||
| connectStream(); | ||
| }, | ||
|
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||
| disconnect: function() { | ||
| props.twitterLib = null; | ||
| props.subscribers = []; | ||
| stopStream(); | ||
| }, | ||
|
|
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| unsubscribe: function(context) { | ||
| console.log('unsubscribe: ' + context.template.id); | ||
| var newSubscribers = []; | ||
| for(var i = 0, len = props.subscribers.length; i < len; ++i) { | ||
| var sub = props.subscribers[i]; | ||
| if(sub.context != context) { | ||
| newSubscribers.push(sub); | ||
| } | ||
| } | ||
| props.subscribers = newSubscribers; | ||
| }, | ||
|
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| subscribe: function(callbackOrOptions, context) { | ||
| var options = (typeof callbackOrOptions === 'function') ? { | ||
| callback: callbackOrOptions, | ||
| context: context | ||
| } : callbackOrOptions; | ||
| props.subscribers.push(options); | ||
| } | ||
| }; | ||
| }).call({}); |
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