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When were done, youll be able to create a cool video for your paperless audio track and upload it to. The benefit of blogging about it as we go is that we get a chance to pass on some of our thought processes as we navigate the hurdles and potholes strewn along our path. Getting those thoughts down while theyre still fresh in mind might guide someone else following a similar path. If we fail owing to these decisions, maybe itll help you avoid your own smoking crater. Either way, later on, well be busy chasing different squirrels in some other park. The previous article in this series is: Creating Video on the server in Node. Js The next article is: Webgl performance Challenge: Render Thirty Frames per Second and Send them to the server This article has been reblogged at the following sites: dzone: /node-js-and-socket-io).
Next Steps Now I need to: Push images across the socket (possible as of version.0) Store the images in a temporary folder, kick off a video build (which i already figured out a couple of articles back clean up the sources. At this point, its reasonable to build these aspects into the microservice as opposed to creating another throwaway test rig. Ill cover that in the next article, and go into the architecture a bit more. Authors Note: This article is part of a series, wherein my partner and i are trying out the development of our a product out in the open. This is diametrically opposed to my typical skunk works approach, holing myself up for months on end in a pointless attempt to keep secret something that will eventually become public anyway. Were not building anything earth-shattering, paradigm-shifting, or empire-building. Just something cool that serves a niche we know and are interested in helping. . Its a 3D music visualizer built in html5 / Webgl using Three. Js., puremvc, react, and Node.
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Js / Create the socket server const port 3000; var socket require port socket. On connection function(client) / Listen for test and disconnect events client. On test onTest client. On disconnect onDisconnect / Handle a plan test event from the client function onTest(data) console. Log Received: data from client: ' client. Emit test "Cheers, " / Handle a disconnection from the client function onDisconnect console.
Log Received Disconnect from client: ' movelistener test onTest movelistener disconnect onDisconnect now, from Webstorm (or some inferior ide run the test-io-server. Js file to launch it in myself Node, and begin listening on port 3000. Run the ml file to launch a server and serve the client to the browser. Client output of the test Server console output That was easy enough. You can grab the the code from this Gist on Github.
On test onMessage socket. On connect onConnect socket. On disconnect onDisconnect socket. On connect_error onError socket. On reconnect_error onError function onConnect(evt) writetoscreen connected doSend Allo? function onDisconnect(evt) writetoscreen disconnected function onMessage(data) writetoscreen span style"color: blue response: ' data' /span ose function onError(message) writetoscreen span style"color: red error: /span ' message function doSend(message) writetoscreen sent: " message socket.
Emit test message function writetoscreen(message) var pre eateElement p yle. WordWrap "break-word nerhtml message; output. AppendChild(pre dEventListener load init, false /script h2 test /h2 div id"output" /div the above client-side code will connect to the socket server and emit a test event with a message. It will also listen for a test event from the server, display its contents, then disconnect. And it shows connect and disconnect messages as well as several possible errors. Step 5: Handle Inbound Connections on Server In the server project, i added a quick standalone counterpart to the test client, which will listen for test events, log them to the console, and respond to the client by emitting its own test event with a welcome message.
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Thats fine, but of help course Id already moved on to creating an html test page. I just wanted to make you aware of this command line client. Also worth mentioning here is, which provides a nice telnet interface for monitoring and debugging applications. This will come in handy while testing multiple, simultaneous connections particularly, with the massive amount of data we plan to push across each. Step 4: Send a message From the Browser There is a handy-dandy resource at websocket. Org that lets you connect to a socket server using the browsers built in Websocket support (with or without the secure websocket layer test message echo, and disconnect. Also on that page is an html snippet you can use to build your own test. Starting with that code as a base, i refactored to use instead of Websocket:!- ml - script script function init output tElementById output testSocket function testSocket var socket socket.
Anything I tried to send immediately closed the socket. So i found and installed wscat, which should have allowed me to connect and send a message with: wscat -c ws localhost:3000 -m Allo? I timeboxed my attempt to connect through the command line, leaving off the message, trying different options, researching the protocol, etc., eventually giving up and moving on to the more complicated but necessary step of creating a test html client. However, i circled back around to the issue while writing this article, because i couldnt accept that there was no easy way to connect to a server via the command line. It turns out that the reason wscat didnt work, is that is not speaking the websocket protocol. . This would be a nice answer entry for the docs or faq page, but alas, it isnt mentioned anywhere on the site as far as I could determine. The answer is iocat, which talks to either Websockets. Install it like this: npm install iocat -g, and talk to it like this: iocat -socketio ws localhost:3000 allo?
if all the functionality you need is actually working. Nail down your scope, dudes, please. Despite all this, the above linked research and sheer volume of downloads led me to believe it might be the right choice for our project. At least to start out. Its implementation details are similar enough to all the other options that even if it did need to be replaced later, the refactoring wouldnt be so bad. Step 1: Add to the node Project npm install -save, step 2: Create a socket Server / Create the socket server const port 3000; var socket require port step 3: Connect From the command Line. Once the above code was folded it into my poc, i had a running socket server and wanted to chat with. Telnet connected, but didnt get me anywhere because although I could connect, the handshake protocol is header-based.
Time to Add Sockets into the mix. Lets just get this out of the way right now: Websockets are great, but there are soooo many libraries competing for your attention. The research becomes a real time-sink. While we now have, websocket support in all major browsers (except Opera mini unless you want to deal with low-level details such as handling reconnects, you probably just want to pick a library. And, please — do everyone a favor: Dont get disgusted, decide to write your own, and throw it into the mix. If you feel those urges, i implore you to fork someone elses, make it better, and send a pull request. My research led me to choose, even though: Its documentation is make horrible.
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Last week, i reported on an important milestone in our music visualizer project: Successful creation (from static files) of an HD video (with audio) using Node. Our ultimate goal: to generate thirty client-rendered WebGL frames per second, push them across a socket to a node. Js microservice, create a video, and upload it oliver to. But its a mad, mad world, and it just might happen. When I last left off, in addition to our browser client (built with Three. Js, react, and Puremvc we had a server-side proof of concept running on Node. Js, ffmpeg, and Puremvc. This poc simply started up, created an ffmpeg command, configured it with the locations of our images and audio, then spit out a video that could be uploaded manually to with no issues.