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<!DOCTYPE html>
<html>
<head>
<title>How we built DevTube</title>
<meta charset="utf-8">
<style>
@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
@import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700,400italic);
body, .remark-slide-content {
color: white;
font-family: 'Droid Serif';
background-color: black !important;
}
.logo img {
width: 300px;
}
.firebase {
background-color: #0099E9 !important;
}
.fire {
position: absolute;
}
.fastr img {
width: 100%;
}
.invert {
background-color: white !important;
color: black;
}
.es {
color: black;
background-color: #f7df1e !important;
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background-color: #ff2400;
padding: 0.2em;
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.remark-code, .remark-inline-code { font-family: 'Ubuntu Mono'; }
</style>
</head>
<body>
<textarea id="source">
class: center, middle
# HOW WE BUILT **DEV.TUBE**
---
class: center, middle
# ?
---
background-image:url(cats.png)
background-size: contain
???
Well, it's actually more...
---
### - Open source (github.com/watch-devtube)
--
### - Channel curation via GitHub (github.com/watch-devtube/contrib)
--
### - All data is mutable
???
your name is mistyped by a conf organiser
--
### - No marketing videos
--
### - Subscribe by channel/tag/speaker
--
### - Better ranking (bit.ly/how_we_rank)
--
### - Better UX and search (thanks to community)
---
class: center, middle
# **1 000 000** views
---
background-image:url(domain.png)
background-size: contain
---
background-image:url(eduards_spain.jpg)
background-size: contain
---
background-image:url(andrey.jpg)
background-size: contain
---
class: center, middle
# .strike[MVP] BVP in June
???
- it tooks us 2 months
- far from perfect
--
## Barely Viable Product
???
- wanted to develop longer, but...
---
background-image: url(spike.png)
background-size: contain
---
background-image: url(henrik.png)
background-size: contain
---
background-image: url(hackernews.png)
background-size: contain
---
background-image: url(producthunt.png)
background-size: contain
???
- habrahabr
- popular magazines
---
background-image: url(twitter.png)
background-size: contain
???
to understand what happened next, let me show our tech stack
---
class: center, middle
## Front-End
---
class: invert
background-image: url(vue.png)
background-size: contain
???
- simple, easy to understand, easy to start with
- routing and state management
---
class: es, center, middle
# ES6 with Babel
---
class: invert
background-image: url(bulma.png)
background-size: contain
???
- no javascript
- super nice
---
class: firebase
background-image: url(firebase.png)
background-size: contain
???
- authentication (github, twitter, google)
- firestore, document storage as a service (subscriptions, favorites, watched)
- Pay as go you. Limits are generous. We go and don't pay.
---
class: center, middle
## Back-End
---
class: invert
background-image: url(algolia.png)
background-size: contain
???
- Serverless, SaaS algolia (~elastic search as a service)
- Algolia had OSS plan and, according to our convo, I understood it's free for OSS. No limits.
--
.fire[]
???
- And then everything went on fire... Limits!
---
class: center, middle
# **Free is a lie.**
### youtube.com/watch?v=ldhHkVjLe7A
---
### @eduardsi: We are victims of our popularity. Need 5M free records to survive. PLEASE!
--
### @algolia: We won't be able to give you 5M operations for free. The 300k operations you have is already more than what we usually give for open-source. I'll bump it to 400k so you can enjoy your Hacker News ride, but I won't be able to do much more unfortunately. What I can do though is to hook you up with our sales team if you'd like.
???
shit, exactly what we need now. dealing with sales.
--
### @eduardsi: OK. Please send me the quote.
???
- at this point it was clear we can't afford it and have to run away.
- but we had to pretend that we are a prospective customer. Saying "no" might have kill us.
--
# no reply up to now
---
class: center, middle
background-image: url(instasearch.png)
background-size: contain
# **Vendor-lock in**
???
nice Vue.js widgets. I don't to build UI! :-)
---
class: center, middle
# **#1 Debouncing**
### (vuejs-tips.github.io/v-debounce)
---
class: center, middle
# **#2 LRU caching**
### (github.com/isaacs/node-lru-cache)
???
Least recently used
---
background-image: url(fastrVersion.png)
background-size: contain
???
- can't change UI. but
- intercept Algolia requests and mimic responses on our backend.
---
class: center, middle
# express.js + Google Cloud Functions
???
- no time and money for managing servers.
- GCF reached GA only in July, 2018. Now it's less stable than in BETA :))
---
class: center, middle
# Why not AWS?
???
- Native Express.js API support vs. API gateway magic
- Easy to use, no access rights magic
- No PhD in computer science (with flexibility comes cost)
---
# What can replace Algolia in long-term?
--
### - Elasticsearch
???
- self-hosted (servers)
- managed ($$$)
--
### - Elasticsearch
--
### - Lunr.js (github.com/olivernn/lunr.js) + Loki.js (github.com/techfort/LokiJS)
---
class: center, middle
# 56,000 indexed videos = **1.8GB of RAM**
---
background-image:url(maxmemory.png)
background-size: contain
---
class: center, middle
# Serverless, in-memory, cheap full-text search
### (github.com/watch-devtube/commons/blob/master/lib/Fastr.ts)
???
look ma, no servers! code + data is deployed as single lambda fn.
---
class: center, middle
# Seriously, no servers?
???
Well, ok, there is one.
---
class: center, middle
# **Nginx**
???
- glue custom domain with cloud functions.
- cheaper than Google Cloud LB
- f1-micro instance, less memory than Raspberry PI and only once CPU
- handling huge traffic and no busy at all : )
---
class: center, middle, danger
# **Cold starts**
???
- 5-10 seconds
- solution: progress bar
- solution: CDN for static files
- solution: split functions into smaller functions
- solution: keep functions warm
---
class: center, middle, danger
# **Downtimes**
???
- no zero downtime deployments in GCF
- aws wins here
- we implemented blue-green. We have 2 versions, then check if app is alive, then switch nginx.
---
class: center, middle, danger
# **Case-by-case test automation**
???
- we do not have the luxury of time to auto-test everything.
- we started testing more when things stabilized (to avoid regressions).
- autotest things that it's hard / annoying / expensive to tests manually (ranking)
- autotest critical scenarios (e.g. where bugs can lead to data corruption)
- No test env, so we deploy and TiP
- focus on MTTD / MTTR (errors go to Slack, PingDom)
---
class: center, middle
# **How much does it cost?**
???
- burn rate 20$
- 300$ from Google
- zero ops cost (serverless!).
- dev time, but have amazing contributors, including famous IT peeps. See –
---
background-image: url(leaderboard.png)
background-size: contain
???
we give karma for data contributions.
---
class: center, middle
# Anything else?
---
class: logo
### - Profits?
???
a lot of requests from ad providers.
--
### - Who'll pay for infrastructure?
???
we. it's not our primary business. it's for conference.
--
### - Logo?
---
class: center, middle
# Thank you!
### @codingandrey @eduardsi
???
Hope you'll join in, so we can make the best tech video hub together!
</textarea>
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</body>
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