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modbus kepware c-programming IoT golang telegram bot python cli urwid elasticsearch aws ecs apache spark scala AWS EMR hadoop webhooks ssl nginx digital-ocean emr apache pig datapipeline found.io elastic-cloud rails try capybara docker devops capistrano heka bigquery kafka protobuf vim iterm javascript emberjs git scripting dnsmasq bem frontend meteorjs meteorite heroku

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AWS Elasticsearch, Elastic Cloud vs Self-managed
Written by Ho Man Nov 22, 2016 5 minutes read

From past experience, I found the maintenance and tuning of a Elastisearch cluster to be a little troublesome overtime. So it isn’t surprising to see hosted Elasticsearch services pop up one after another. Ok, to be fair, there are hosted services for nearly everything nowadays, from Kafka to Wordpress lol. There is really no shortage of them. Most...

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Nil, Try & The Lonely Operator
Written by Ho Man Jul 28, 2016 3 minutes read

Recently, I left a comment on one of my colleague’s PR and we had a discussion with him about the use of try vs the lonely operator &. and it led to a number of conclusions personally.

I used to use lots of .try. I’ve also come across codebases littered with it, be it in the presentation layer or in the models. From personal experience, I’ll say...

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Capybara & Waiting
Written by Ho Man Jul 27, 2016 4 minutes read

All of us do TDD or at least some form of automated testing, I hope! If you’re writing tests in Rails, you’re likely to be doing feature tests with Capybara as well.

Some of these slipped my mind while adding feature specs at work at pocketmath and I spent extra time that I shouldn’t have! So I hope this post can be a reminder to myself in future...

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Setting up Dockerized Golang + Postgres on Digital Ocean
Written by Ho Man Apr 27, 2016 5 minutes read

My previous deploy on the Rails stack was a little more involved so I chose to just deploy it in the conventional capistrano way after setting the server up.

But with the rise in popularity of Docker recently, I’ve been wanting to deploy something into production with Docker but never found the right app for it until this one.

It was a simple Golang...

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Capistrano, Postgres, Rails, Nginx & Puma on DigitalOcean
Written by Ho Man Jan 22, 2016 10 minutes read

Recently, I’ve been working on my squash club, UCSC’s new site. And of course, being slightly short of time, I kinda just fell back on Rails to quickly get something up for the club.

Before Heroku decided to put a 7 USD price on their free tier, it was an easy default for hosting any mini prototypes or projects. Ok I admit, I’ve historically used...

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Kafka + Heka to Bigquery Setup for Realtime Logs
Written by Ho Man Jul 04, 2015 4 minutes read

This is part 2 of the 3 part series of a quick intro of the realtime logging system in Wego. In Part 1 of this series, I talked about how we generated Go packages for Protobuf (protocol buffers) in Wego.

The packages allows us to process 2 different modes of communication protocol with just one set of schema defined in proto files:

  • json package...
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Golang + Protobuf
Written by Ho Man May 05, 2015 6 minutes read

(This is part 1 of the 3 part series where I discuss how we handled one of our new API projects and the usage of Protobuf + Heka + Kafka + BigQuery to view realtime logs.)

Recently, I’ve had the chance to work with Golang in Wego to build our analytics API that will log our visits into flat files + upload them into Kafka for further processing,...

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Predefined Structs vs Type Assertion in Go
Written by Ho Man May 21, 2014 5 minutes read

Suppose you have a JSON of this format:

{
  "results": 
    "collection": [
      {
        "name": { first_name: "Ho Man", last_name: "Boa"
        "phone": "123456"
      },
      {
        "name": { first_name: "John", last_name: "Lee"
        "phone": "2345"
      }
    ]
}

Similarities

There are essentially 2 methods to do this, using pre...

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VIM Toggle Background Scheme
Written by Ho Man May 20, 2014 less than a minute read

Have you ever wanted BOTH the dark and the light background schemes in VIM? Perhaps in the day, you feel that you can concentrate better with a light background and at night, the dark. I did! So I bound one of my Fn keys to do just that.

This works well for color schemes that offer both dark and light versions, for example Solarized.

let g:scheme_bg...
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Opt-Arrow Navigation in iTerm2
Written by Ho Man May 12, 2014 1 minute read

Something that most people use frequently but take for granted for sure is the use of Option + Arrow keys to navgiate between words in Mac OS X. Its just something you use and not think about much and it becomes second nature almost. So when I moved to iTerm, I’m sure a couple of you would have wanted to maintain the the same behaviour of that in...

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