The Go awesomeness

09 Apr 2018 - Tags: golang, awesome, list, development, pprof, go, google, delve

It’s one year since I started to use Go every day at work. I was using it before but for fun or OSS projects. I was looking for my next challenge, and I was mainly working with PHP, JavaScript previously and I knew that a compiled, statically typed language was my next step.

At my previous job at CurrencyFair, the environment was pretty standard for a financial tech company so backend in Java, frontend in PHP. But my experience with all the interfaces and abstract classes that I created in Java at that time made me hate that language. So I was looking for something different.

I was as I am now involved in automation, cloud and operational other than development so all the tools like Docker, InfluxDB, Kubernetes, Consul, Vault was in golang and for me as OSS addicted it become the natural choice. Now after all this time I am ready to write why I think Go is the right choice for me now.

1. abstraction and maintainability

I wrote a lot about this topic, so I am not going to repeat myself. But I think maintainability is tied together with abstraction. Previously when I was working with PHP, we always had services, injection and so on. In that environment it was good, but all that abstraction like in Java doesn’t make your code more flexible. It makes it hard to understand in the long run and code needs to be written with history in mind because delete code is very hard. Go with its interface implementation, how it forces you to struct the project helps the codebase to grow in a better way.

2. Stdlib

Community wasted time across languages to identify the right way to indent code. Go comes with that decision done. Same for testing. How to write automatic tests, benchmarks is inside the language. No libraries, it is there. More in general os, net, net.http, img and so on, a lot of stuff are provided by the language itself. It is great because you don’t need anything to start, other than Go. Compared with other languages you can do a lot more things. Having all this feature inside Go guarantees compatibility over time, they won’t break compatibility for the next years, and the code is developed and reviewed by a large number of people.

3. pprof

pprof is a profiler, and it is shipped as part of Go. You can use it even via cli, or it also has an excellent HTTP package under net/HTTP/pprof. Just to show you how much power it can be InfluxDB extends it to export a zip archive with all the information we need to troubleshoot the database behavior:

func (h *Handler) handleProfiles(w http.ResponseWriter, r *http.Request) {
    switch r.URL.Path {
        case "/debug/pprof/cmdline":
            httppprof.Cmdline(w, r)
        case "/debug/pprof/profile":
            httppprof.Profile(w, r)
        case "/debug/pprof/symbol":
            httppprof.Symbol(w, r)
        case "/debug/pprof/all":
            h.archiveProfilesAndQueries(w, r)
        default:
            httppprof.Index(w, r)
    }
}

Here all the code influxdata/influxdb. This is super useful because we can ask customers or developer in the OSS community to export and upload the archive to see what is going on. Having a standard way to troubleshoot and export a profile allows us to build visualization or static analysis on it for common calculation.

4. delve

A good debugging session is the best way to approach a new application or to go deeper learning a language or a software. delve is easy to setup and to use. Even if you are not gdb/debugger superhero as I am not you will be able to make your first steps with delve. So it is a nice starting point too.

5. godoc

Other than behind an excellent way to generate documentation from source code I use it a lot even when I am not designed libraries just to double check that my package has the comprehensive public methods. I always think about what I am exposing to the outside when I write code. APIs are not just JSON or HTTP thing, every object exposes their API, and you need to be aware of how you are building iteration between the internal state and the outside. Avoid misuse of your structs is your responsibility as developer and godoc help me to identify poor decision.

6. vim-go

I would like to stay in my terminal all day, and vim-go allows me to write good code in my comfort zone. In the past I wrote a lot of vim scripts and plugins, following how fatih and all the other maintainers are developing vim-go is great. Bonus point they recently added support for delve, so you can now debug golang application in vim!

7. dep

Dependency management is probably the worst things that Go has. The good thing is that now we have [dep] and it should become the standard way to manage dependencies. Right now the situation looks a lot like this:

Govender, go get, glide currently there are a lot of different ways to manage dependencies, and it generates a lot of confusion, but I hope at the end we will converge in just one. Probably dep.

Conclusion

More in general with Go I am learning that the language is one of expect to become a good developer. A good developer needs to know the language, but the best way to go deeper in it is writing tests, benchmarks, profiling application and using the debugger. All these tools make my life as developer easy. Easy life for me means that I can go deeper solving problems and indirectly it will make me a better developer.

Go is fun!


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