---
title: 1426830735
slug: 1426830735
published_at: 2015-03-21 18:55:25 +0000
updated_at: 2026-03-04 20:15:09 +0000
summary: 
description: 
tags: []
views: 59
author: CJ Avilla
url: https://www.cjav.dev/videos/1426830735
youtube_url: https://www.youtube.com/watch?v=1Z4otSnv-t0
youtube_id: 1Z4otSnv-t0
embed_url: https://www.youtube.com/embed/1Z4otSnv-t0
thumbnail_url: https://i.ytimg.com/vi/1Z4otSnv-t0/hqdefault.jpg
type: video
---

# 1426830735

*Published: March 21, 2015*
*Views: 59*

## Watch

[Watch on YouTube](https://www.youtube.com/watch?v=1Z4otSnv-t0)

[![1426830735](https://i.ytimg.com/vi/1Z4otSnv-t0/hqdefault.jpg)](https://www.youtube.com/watch?v=1Z4otSnv-t0)

## Description



## Transcript

what does it do alright cool guys welcome house are we doing movie we're still celebrating st. Patty's Day here so I kind of beer there's funny yeah we got a good one here tonight so I'm really excited a couple of a good full tox than a sweet little lady talk so yeah anybody went across to speak I think we're good for smoke we might have once a lot of it but yeah if anybody ever has a tonic to speak on please you know me myself for Stephen we're both bearers of the assignment as well but he's kind of in and out so yeah anyways let's get started go ahead and do our frickin truck on a epidemics the people who so graciously are paying for us to be here hey fun a distance ER and my name is Bonnie and Ronnie Burgess your economic so welcome and i'm not sure i think it would hear know what we do or what we don't do we're a p.m. so thank you ready except better and probably the reason a lot of Yonkers what we're doing is we additionally got out to the more the enterprise space and the bigger customers and we're tradition selves in the office kinda suppose we all costs I some money and all virtus taught my checks so what we're trying to change that and my cuz we're doing more like it is more is more instrumentation we need to not focus on the outside did more developers announced walking the reason hosting this beta was probably get a better communities now it's a gloss scene we're not talking for for what we did and we did with ton of ideas you know made a job we see shower bags no high five agent we do some anticipation he do this stuff so enjoyed thing and it was any questions about what we do at the technical level come find me we're also recruiting so I would be killed if I didn't mention that so it's also our friendly recruiters for me if you want to have gonna chop presents enjoy guys yeah thanks you guys so we're going to go ahead and kick it off with our everyday carry seems like people are carrying less these days anybody have some of the shares pull you're working on we found some clear using the other exciting punch it is today how come you guys are first-timers here in SF rose wat EK r is my welcome our interview every day character I'm so H Ken and I wanted to pitch an idea there a couple of us we have a company called SF working group you should and we're thinking about running a meet-up make it really clear or bi-weekly every other week and we're going to start with book club we're going to go through sandy Mets book first victim but we want to get feedback from people other stuff that we're looking at doing is maybe we'll get some algorithms have things like spending big o a bit try no imagery on values and particularly trying to look at how rails for instance implements arrays and what are the big o of various different features of brands so if you have thoughts can at the SF working group com or just confront me but the idea and be back all right SF working group com nobody's going oh they meet up it's hard with the Unreal developers it's like super on the nose but you had some awesome higher so far and especially appeared to yourself where we had a lot of people show up and even our last thing so checks out our next meetup is April 15 gallons go do you guys say for creating peace nope no return b is free it's free to present and pretty sure nice what's the name again higher higher ruby on rails developers at my local search Saddam Viacom if you have it yeah we're working on a working on a personal analytics out though just finance the devices take your starbucks out your sweep out sherbet shu RBI 20 in Virginia data so we do something god I all right sherbet that I oh if anybody wants commenting access on product hunt get that other person you get conferences say okay anyone anyone else right hey yes I just say you like come up with otherwise I'm just gonna be running around I'm not wearing my rails as a public service announcement like two days ago from being tuned pointed watermelon remember league and it works great we're craving rails and if you're not on rails for afraid that's your public service announcement yeah all right I think work wasn't like 1.8 or something hey everyone my next column actually I'm a physician in Canada but I spent about half of my time down here at San Francisco we're trying to basically set up we have a start-up up we're trying to get off the ground as hope we get to disrupt the P walls a type of journal industry and we're basically looking for full staff developers to you I make that happen so I'll leave my business cards I just in front of that table over there any cool all right well I guess if you're hiring or if you look at me hired come on up hit yourself or your company you don't bite hey guys made from a couple of our goal to marketing company these coats we purchased a start-up over here footlocker friends he has a part of it we're looking for rails developers and I was that would have worked for an on startup Seto we just purchased a start-up but to scale it stability because it'll benefit so you defy my friends or Merkel pyaar ko Li ok oh yeah you could like you up right here nice little cute hi I'm Ted I work at a company called edible we're startup we make an appt for the construction industry and it's basically a way for contractors to rent construction equipment more easily it's pretty straightforward and working with suppliers to and basically came up here to tell you that you know we're looking for senior engineers we are all JavaScript though we don't do anything else but i figured when you probably go down script so yeah if you want more information you can email me at Ted and gettable com that's p et al de or where you come find me Thanks hello Vincent you're hired developers it's a fashion company you only personal styling for women but it's backed by a data algorithm that basically takes all site preferences and recommends that ship to subscribe to money and it's just a really interesting place work I work there as a senior software engineer right now and so it is open to level this officer really great potential interview you can check out our technology blog at technology that's the text i think just real quick my name's market tom i'm doing a bootstrapped startup no money in it and it's it's a healthcare space specifically physical therapy rail back end rails facing the clinic and iOS facing the patient if anyone's interested in the concept and the ideas and learn more reach out to me at mark ok at keep on moving with without g keep on moving com thanks awesome cool so let's do this real quick if you're looking for a job raise your hand if you're hiring raise your hand cool take note all right or go to the I argument where you going to pay fees okay cool um I guess we get started if that we have something to share please don't hesitate to share I know as a Memphis older I can stand up here is like yeah but if people are like gold it because at least you got the cojones to come up here and say something so yeah don't be scared vrl making sure we don't bite and most likely what you have to share is not a moment but a lot of people and that's why I grab your doing so without further ado I guess we get started read oh yeah hey okay cool do you have my so I'm a fan I'm going to talk about the full you'll call back engine that I wrote and I didn't think much of it until I found out that they actually use it at Billy oh so is actually it's actually pretty so fully of everybody who has to do who joins has to do sy understand as to do fully olap or something that uses the video interface because you know you're selling this your product we want everybody to have at least a passing understanding and what actually what it is that you're doing is your company so of course you're probably all kinda know what really to kind of like and I'm not associated with them at all when we just need to look for another project it was kind of to do so fully allows you to kind of like have you here to talk to the legacy archaic phone system with all its like 1930s and flight nology bridges protocol wholesome they wrapped it sold in a nice package for you and then it's really awesome I had is easy to use for the most part and yeah so that's portfolio does I work for originated we help people build startup companies people come to us with an idea in some funding and help them build the first version of whatever it is you're doing poems for doing android my home I can no radial of course and we have offices here in LA and Vegas you're from China Stockholm where only a hundred fifty people but it's a real fun place a lot of interesting projects we have equity participation in the projects that we work with which is awesome and you don't get that me so if they there for like five years now and I have very diversified wing startup portfolio which is like you can't do that unless you're a venture investor which we're not but we're working with all these interesting people and it aligns our interests with our partners very well so we really want to want to make them succeed because then visit across tools we have real twenty percent time so you get working your own thing and actually I'm leaving next week and I'm going on my way to ted project come like full-time thing now and doing like DNA sequencing is it as a side project which is kind of really awesome so best place I've ever worked at and they say you know come back anytime it's awesome it's really cool so if you want to if you want to apply send a mail to work it originated calm and it's like not shut up about this house there's a QR code for Prezi you take a photo of it we'll get back to that later at the ends where you came in the gentleman URLs over there it's a robocall gym and actually here's my problem that I wanted to solve we were doing this safety app and so it will take their emergency sometimes like animal your salad is infected with e.coli bacteria do something about it every year after your your staples on fire whatever so you want to get people's attention you want to quick and so so we send any emails we then text messages but sometimes it's best to call people so what I wanted to do is like something like this i donate the i call and i say like call this honor emergency go fix it whatever it is federation text and then coolio will go talk to the phone somehow whatever day googling calvin over and then in bring the guy picks up the phone and then it tells them to message maybe 3-4 times you know like your bank says like there has been like a brawler or something like that that's what i wanted to do and i didn't really wanted to anymore now but the twilio interface what of course you could say this is a problem if computers enslave humans and computer culture in over 90 tells you what to do but really you know yet stop my problem I everyone making the calls ready to sew so what will you does actually is is similar but it's not quite the same thing so what it does is like I could tell twilio go call this number and then Julia will go and though kind of call great thing leaders whatever archaic system that they have and like all the all the other few people there and then the phone will ring first the victims are phone and it might take like five minutes for them to pick up who knows maybe it goes to voicemail whatever when they pick it up twilio gets a message like you got a person and an equally Oh calls back means there's like what do you want to say and of course just like seconds or minutes of cost hearing my my port is closed and i'm not actually next thing or my thread that's gone on for the context for that so i don't really know what i want to say right so so it is a powerful way you can also ask you can also get a call back whenever button is pressed or you can get a recording of what the person says all kinds of things are in the API but in my case I just want to push this message that can be done right so it's powerful but all the things needed to make it work so if I actually want to make it work I need to you know add the tests Adam helper methods adder out and model migrations to kind of like make all this work and and then there's like trivial little bits is only two three lines each turret bring them all over to code and they essentially do this callback thing at ease there's a call here to call capi you have to put a comment this is like yeah in like a minute it's going to go back to just URL over there and then you really kind of tell them what you want to say and that's kind of the pain so you know sprinkle it all over the place and there's no reuse so is bad so what I've done is essentially I wrapped it in an engine and it's like the perfect use case for mansion so what the engine does is you know I call this number and I have some message that I want to send an important message and then my my engine will store it in the database and give me back 90 and I'm assembling a URL with that I key oh ya sold so this kind of like a little bit of the code here so so essentially I i call the same protocol and i give it a number of the text and the language and voice and the from phone number that's kind of what you need to do when then this is this is how its implemented here yeah so essentially it calls creates a robocall objects and saves it in the database it makes a half or a callback and any calls the standard freely on interface that's already there which is you know that's three that's pretty straightforward right not none of this is rocket science it's just kind of nicely browned so then I call the twilio interface and he calls the phone number and it tastes true it goes true to the person and pick up the phone when it comes back and eventually they got a person and it calls its round and it gets mine it goes into this little handler and it's called manual somehow that's too bad essentially i'm checking whether the record has been found and whether the token has been provided and stuff probably like where you put your message i'm just telling the error message to a person and calling which is weird if somebody doesn't work in the middle of a nation you kind of like you know what the heck you pick up the phone and is it like no token provided America service but it hasn't actually happened it's very stable but for debugging is kind of nice you get it with the cultic you're getting but yeah improvement here but yeah so if you ever get a call in the middle of the night says like no token is I'm provided yeah my fault actually tells you it tells you this one here so it gets you a little bit more context but yeah there's an error handling issue here so then you know it sends it to the phone and then the user of course price drops the phone and great so yeah they're so um so all you have to do to use this essentially used to use it use the channel update a big bundle run migrations and then you add the twilio magic token so twilio gives you you make you sign up for an account give it a from phone number and these proteins and you give it to the web accessible external path or where your server lives and then you just call these things and it's actually just it's pretty awesome you can do all kinds of things I've done this actually so it's great for prank calls you can call people and you think you could say something like you know have dear mr. Miller and this is the IRS early warning center your 2013 tax return had an issue at us 20 1583 setting a dollars within 23 cents and like breaks out light itself that's probably y este user 23 minutes probably his federal law claim first night but I don't know what I'm doing impersonation or a family of those impersonate probably okay so yeah so that's and you can set the language to which is nice I think it was like 11 languages and there is a whole XML thing so you can say like say this in this language so you can make a little theatre play like maybe two people arguing so you get a call and then there's to be marketing on for more there's an XML format is documented here that you can kind of like say like person asus is person visas is first days is that wait five seconds and then you know you can add mp3 files as well but that's a separate call back tonight don't do binary files I think at this point there's another fix that needs to get in there mr. 0 called clean up that goes in at the end like you know it just force these things in the database and never actually clean smiled so probably there should be cleaned out once taping process may be offered half an hour or maybe so you can give you your still have to clean it up is really not that much data all people that broke maybe cause trouble once waited so that's that so it's nice because it's fully encapsulated easy to review easy to test clean interface it has all its own things it's like it's a unit as a whole if you want to use it you to use that thing and it's not scattered all over the cake code so for use more engines reading it away if it make sense of person yeah it has all these benefits of the tutorial on their own they're on the rails page is actually quite good and then well there's budget stuff that needs to be done still and more tests XML generation is kind of like happy right now so that could be approved the state machine there's a machine support actually so you can say like please press one and then when they first one you convert a call back you can do something else so really what you want to do is you want to describe the state machine and then whenever it hold back it gives you the other message and it keeps on going right so so you can you can describe the state machine with one of the state machine gems and it would automatically do all the right things so you just have your stinky description for your whole call center thing but that wasn't really need for the German tourists like nice and clean and has like one called one method to drive an auto thing of the database will be nice and then there's more coolio things that could be exposed in that way as well so that's that's just crazy and I'm going to leave this up if you like have any questions I tried to hold it for a while back what I haven't tested on a very day just want to go yeah yeah yeah it should be ok but yeah yeah so yeah it has unit tests but they don't actually certainly wasn't actually running them when your rails engines personal request of course yeah actually it seems to just work is simple enough for what is also but if you want to add stuff sorry I mean like that like I come over yes sir say again why is this oh because it has a route in it and it has database migrations in it and all these things I don't think you can do that with the gym because it's like reaching intruder it's doing all kinds of raising things we're handling requests it has it has a deed as a as a troller it has a library function it's like that's is scattered all over the place so it's one way to kind of nicely isolated I don't think I think I looked at making a gem very very early on in the day I don't think is actually good at any other questions and your suggestions and because we're productive at work today I was I was washing the tournament oh sorry now Marilyn place tomorrow how many you guys of Maryland upsetting twenty bucks down for the awesome how many how many guises folio work in your day-to-day projects yeah you guys I'll use it for like two connector off over to text anyone using civility look like a weird life one wouldn't normally go yeah my buddy is it to spam me with justin bieber tweets like it like a stream be between spit all right get on dry lightning dock if you want you guys hear me okay you have the good ball shouldn't get go rock stars okay cool so my name's Don um I just went through why see this summer with two co-founders and we made a single block spring so essential o'clock spring is is it's a community driven Society of over a thousand actions and you can use from any language so basically people will build all sorts of crazy stuff in this you can see we have a bunch of categories here a little small but uh so you've got like text analysis finance converters people made API rappers data visualisations scrapers image processing and e-file utility it's basically just pretty much anything which you can think of made into a function library working on this side right now and so because you can call anything via API you can use it in any program from any language we use the lung and rails for her background jobs so basically like you'll set up background jobs sometimes that's a painting that you just want to you know you something asynchronously if you think of Amazon land this is very soon so let me actually show you stuff so uh here's an example of a blog somebody put on it so like I searched for word cloud it's man-made a word cloud here and we realized an important thing with any function is it's a bit of a pain to ramp up on it right like you have to read the documentation you have to look up in my comments you don't even know if it's really going to work for your pain so you actually test it out it's really like okay what we should do is generally a page for every function someone posts on this so never you make a blog and post on blogs freeing generators page review so people can try it out before they implement them in their code so here's a form I payson by pasting I guess the preamble to the Constitution but you could pass in and attacked by within my anila generating the word cloud so that's trying it out and then obviously the second step is actually using so this is where it shows you know you need a giant block it's an associate 10 girl but you know here you can see note PHP Python Ruby basically you made with all of your language so then the second thing is like any good function you can combine them so if you have word clouds well that's like a data visualization but you need a data source obviously hasn't any data but we realized a lot of data sources Oh should also people eyes so we made things for march madness you know pull basketball game data someone just made one for getting up which is people in real proud no matter some medical journal in query Google Spreadsheets inquire your Postgres database which a lot of you are on a magic re di so one of them may can get your recent news for a stock ticker so if we go in here you can put guess it all goes with facebook when we contrive any company and then it returns the data to you as a as json so basically i think this is getting data from one of the news that's like galvanized your crippled days so anyways we have a word glad we can get recent news now the last step is uh people can actually combine these into blogs so somebody made somebody made a blog called word cloud for recent news oops yeah there we go so basically it's just it's getting the financial data up asking right on through to data visualization so any blocker here like i said just like any other function you can just combine them so let me show you how to actually create a blog really quick if you click on create so the code is pretty simple when you're creating a blog all that happens is you're taking parameters from your API processing them and returning in an output so here in request quran this it's just a big array to all the user and lets you access them and then response not add output that just puts an outlet so you can say hi my name is all ages 16 and over areas were you a new parameters and it's basically like specifying to a user what type of parameter should be passed and what the name of the variable is yeah that's uh that's box great any questions alright always get set up i forgot i might ease your room like you're on your own slide for those of you who've been here before it's how i use expected Monday I work for a company called iron I oh we're the message queue for the cloud if you need a sink processing done you can come to us as well so like delay job whatever you guys need to do your background jobs we do is better or I more like cron jobs because like cron jobs suck you never know if they ran it or not well I read you know if they're in our nose because will guarantee that rose and if they don't then you could talk to see you it not to be unless you're giving us a lot of money that's where I come in for some reason they chose me um good cool alright so I am very excited that you're here today because this is going to be a little bit different kind of presentation you have found yourself in an interactive application right all of you in the audience have visited my site so like I am the sniper image or it is a like interactive thing okay the way that this works is how you know the way that you input things is that he'll tell you what say you'll save the way that you click a button in this world like a cloud overhead or submit all right so it's very exciting as you may have noticed that don't have HTTPS nor do I have a privacy policy so take that I Wentworth and so I'm video at Villa we're gonna kind of me and I would love it if you could all spin up please yes okay so all right we're not will not going to authenticate right because i only want to show you things if you have a fully authenticated so please review of me I say your email okay my password is say your password prophase okay all right I'm ready 123 okay thank you welcome insert email address give now been fully authenticated please take a seat okay so what I'd like to imagine is that this application is something that needs to know who's online all right so maybe it's a collaborative document editor maybe it's like a game lobby and we're more appropriate for a meetup is maybe it's a chat room because we're all here to meet up right so the idea is already implementing this feature which shows who's online and we're a look at some code and very quickly over the next 15 minutes we'll get four different approaches to showing who's online so as you know if you take a link to some very popular site and you posted on Hacker News are the link very quickly spreads throughout people so we're going to do like wave type thing start over here now my hand past you just with your hands you don't need to stand up but I'd be like a little way okay ready okay okay all right stop no no don't do it okay alright great so all of you on this side of the room are early adopters everyone else must be users of older side to AOL or something so the early adopters have visited the site the very first thing that we're going to check out is implementing who's online using the last scene so maybe if you think about this for a little bit you'll realize that like one option to showing his online is using the last login time of some use it right so yes brace yourselves traffic is coming so we have this wave of traffic coming in right and one way that we might do this is by touching the current user for every single controller action right and then like giving some delay if they have visited disciples in the last ex seconds will consider them someone who's online okay so here are the considerations look at this code okay bring it up all right so for the rest of the presentation will consider our user model to look something like this nice little gravatar because we didn't want to grab at arm of their user panel right very single Korea's remembers know like looking up by your email that he told me and for last seen this is how we might implement a list of current users who have been logged in since some like updated that right like every controller actually touch the user to the update the user and if they've been logged in the last hundred names like 30 consider than login this is how we might want some like touch current user touching not sure if that was like the best thing for a method and here is here it's just like some like a little HTML or via they are in C so up slow problems with this problem through this who can tell me why this is bad like or actually like first who can tell me like how we can make this fast how can we make this money fast database people okay add an index yeah Adam index up they do that right so that's that's great good answer but even like beyond that right if you think about the updated that if we're in the current user table on the updated attribute and every single controller action we're hitting we're like adding or by constantly updating updated for every single controller engine so we're going to be like crashin this index pretty rough so if we have lots of users not going to really work I think this might be how soundcloud implemented who's online in the beginning and then we like stop showing that killed a feature and then the link that told you about that is gone so fortunately officially a look okay so I'm also like how you choose an appropriate delay right 180 seconds like who knows what the right answers for that all right second option ok we have a way keep my cache of users so we want to use your visit is the page they'll send me Jax request with their some user data will take the requests to put it in the rails cash and then when they leave we'll just delete them out of it so let's play a little game I'm going to practice the cash you're going to say your favorite gem and then locked and loaded and then that would be our registration and then you'll say your favorite come again and over and out okay they'll be like room for your favorite gem from children vibrating from my cashman and i'll try to figure out like what gems are still online because i can't remember name is very well just use gems okay so all right okay all right ready go get it here look thicker already think our arsonist pcr thick rails VCR finding a color i'm a job hey page opens did you pee gega good ok everyone is in now if like takes them out so if don't want to like catch puts our side rails out okay i don't remember any of the other ones right sound like Angus a buffer up close number the point is that like managing this cash is really tough right but also there's a couple other issues so right let's look at a little bit of code okay okay so this this bit of code is a bit more we have some online users controller right we're going to like this is going to be the controller that handles the registrations we're sending some post request with user data and we have like every every time we hit this patient above the for action which is going to like real like current users whereas at the end of the controller action updated who are the current users some very simple HTML and a little bit of JavaScript here okay so as you see like when when the documents ready print posted this online users resource and we're going to add usage the list and then at the end whimper when we're going to close the browser like this is the plan the plan is when we close the browser when you leave the page we're going to send some delete request but it turns out that like this is not guaranteed to work this before on a little thing is not guaranteed to work in fact it doesn't work every time also a sink false that seems pretty gross right like having to put like an async false in an AJAX call on page like on page leave feels very dirty right very good don't want to do that so so yeah it doesn't work every time feels dirty probably not the right answer has anybody know why we need to put they sing false here when we're like watching the page leave that's right yeah so it turns out that if you don't have a sink false then before the xhr request can be sent we're going to enter another event loop and on the next event of the page is going to close so like before the Senate actually happens the page is going to close so kind of looking in number eight how very reliable so another good idea okay come out here cool alright so the problems are that it's like really hard to manage this cash and it's also hard to like handle the unloaded problem so yes now with the time to talk about web sockets right so when I explain to my wife that I was going to be giving a little presentation about who's online to think okay that's interesting not their dead in smiles she's like totally not into tech and at some point she heard WebSockets right and I was like okay cool goby I'm like really really interested in like you know how did some probably doing like some audience interaction I think it'd be like fun and so she went to the store she brought me back to socks that look like they're from the width so they're like web socks nerd and then these have like headphones on lips not so we're going to use these workshops tonight ok there any perfect cross web socks I rowboat something's so this is like definitely another huge portion of the song the online the who's on on my problem one option is to use some third-party service okay so pusher great option probably one of the first things that came to mind maybe if you've dealt with this before how many people have used pusher for sure oh okay good so pusher is in third party service you you sign up you get some API key you've had some JavaScript to your page and then you can publish and subscribe to events that happen over channels and the they charge you if you have like beyond a certain number of connections so I think beyond twenty pensions don't start talking you simply add more connections but you can have some sort of real time like using pusher drop into Jenna Johnson javascript in your good to go so that's one option alternatively you can use can extract a note service and write a little bit of code with socket i/o okay so how this works okay these are web sockets here okay so the idea is that the way that you know who's online it's who has an open connection and open socket so if I think one of these sucks this will be one end of the tension now they're nerds all right I'm confronting the food so it's like okay so valina and I have a connection with this nerd socket it's nerd websites right and if I have this other southern sock hear it so now you're going to be online oh oh oh because we all went together this one okay so now we have like to open connections right very clear that we are connected okay very clear that we're connected as soon as the page closes they're going to drop the song on the floor or they're gonna send it back to me right the socket is going to close as soon as the page closes now another interesting problem with registering users into it into a cache is that we don't know if the page is going to reload like they're refreshing the same page or if they're leaving completely fry seems like maybe you take the users who are in the cache you put them in some Q and like after some delay like remove them from the queue huge pain so with WebSockets the nice thing is that if someone's on the page you have a song you have a pension right so you know but it was on the page so some big prizes hey okay so what's like it some comfort okay so okay all right so i want to emphasize how simple it is to set up song avail it's very surprising okay so all right we've got here's option for here's a little bit of HTML Iranian robbed before socket i/o just call the socket initializer passing it the resource of your note server that's running okay so you can spin up a note server put it on roku and now this argument will be the dress of broken we have two main events one of them we are admitting one of them we are registering and listening to okay what's cool about this bar like this so all so much it's it is a very naive implementation every time a user comes on or leaves I'm just like Full Sail like updating all the users who are online okay we could be a little bit more clever but this is very simple implementation this is this 32 lines is all of the server this is like the entire thing all the genie or for getting set up with his own right okay so we're using go static load ash and aesthetic server to give some soccer no files right hey we're also using something I oh we have these little login logout proper functions we're keeping this hatch of users based on their socket ID on the back end and then we're simply listening for a pension of it and a register event an disconnect event and then every time we have anyone register or 90 Full Sail update so pretty simple surprising supply so that is talking to ah yes so that's it those are our options alright so existing solutions that I looked at four then we talked about a last seen cash using the butcher Griffin channel running around like I chasers nodejs socket i/o service I also during that researches saw that pub no one of our response enters the thing right hook now uh yeah they have a presence are part of their packages like something about presents also a firebase has some built-in breath and subdue so a couple of their price services if you'd be interested in checking those out okay so so then that is it and as a good users want to like make sure that we sign out so they're gonna end up again all right okay great thank you again so much for coming I really appreciate if you would like you know go say hi to someone you don't recognize alright so let's sign up 12 so question so the question was when you have all these sockets open where he is scoring down and have you isn't that so the none of the communication on the server is talking riddles like it's just the clients are talking to this service so there is no light actionable I mean so in note you could make requests to some Postgres database if you wanted to like walk when people were on it the most basically just keep the JavaScript object that's full of socket IDs and i'm going to describe know that that is the whole Dennis like the entire beckons the 30 lines of yeah yeah yeah a little bit so this is like this is it brother five so you can see this is Audrey one I can do oxygen three the present channel apparently isn't working very well and then the service just kind of like shows us online you can my login as abusers alleged becoming for both the rails app in the deserts are all trails a pisser exactly yes yeah so socket i/o I know they have they handle all of the connection details for you ok so if like for example the browser doesn't handle or doesn't have like the web this website emendation they'll fall back too long boy so they and all that well it's using the lip sucking again like in the Brussels this fabulous was to suffer connection precious what happens to sock you mentioned please refresh the page good question so we're still going to like having one register we have a disconnect and reconnect but don't gain communications satellite again so it will show the user flash but what's nice about this implementation rather than the distant like that the caching implementation is you don't have to manage the connections like if they're the catcher they're not in the cache like the president spoke the socket like the socket being connected is enough to know that users on but there could be do like oh my good sir [ __ ] a good connection with 12 10 you later yeah so as long as the pages open they can make those talking to the state of it but there's much false positive ID if i refresh page 51 or this interaction just do leave is a decision by sometime yeah and so the same this the same sort of solution that you can have for the caching problem on rails so if you have like some q of users have disconnected and then light with a timeout go through and remove the users who are in the queue from Lily online cash you can use to dl what does it go GTL lifetime okay okay okay cool yeah so you can use details yes this may be really basic question but you do what supposes that you have to keep track of ending so much is storing like the gobbler cash put the socket IDs and a socket i/o would handle the dimension information so if someone does next day enjoy yourself good all right yes so I have this one of my ideas resolutions was to type faster I'm a terrible awful type of stuff I want to take master site-building game called wpm challenge check it out it's kind of like tight racers tight race against your friends so it shows like there's a good little game lobby we can invite people and see who's online racing but this is like where this problem I realized all right oh good awesome thanks let's give a big round one of our speakers yes thank you very much appreciate it yeah so our next meetup is next month the tee spring got some good speakers lined up so really sad for that thank you all for coming out do you guys need help stacking chairs or anything good ones go twice now will only do this with this one joke before we head out I got one strike a tradition where we tell like programming jokes before around retreating or meet up so sequel three walks into a bar goes up the two tables goes hey can I join you

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