Category Archives: golang

Make your bot for telegram using go

It’s really not that difficult. Here are the docs: https://core.telegram.org/bots https://core.telegram.org/bots/api Here is a simple library in go for telegram — https://github.com/go-telegram-bot-api/telegram-bot-api/ (too simple, from my point of view, does not cover all functionality, but okay). And here is a skeletton for making your bots if you want it as just standalone binary — https://github.com/nezorflame/example-telegram-bot/

Gitlab-ci: build go app with docker as a docker image

Preparations [TO BE UPDATED LATER] My gitlab-ci.yml

My Dockerfile

Pulling from your private registry Create deploy token as described here. After that, you can do this:

Useful links: https://dev.to/hypnoglow/how-to-make-friends-with-golang-docker-and-gitlab-ci-4bil https://docs.gitlab.com/ee/ci/docker/using_docker_build.html https://medium.com/@tonistiigi/advanced-multi-stage-build-patterns-6f741b852fae https://docs.gitlab.com/ee/ci/yaml/ (full description of gitlab-ci.yml) https://about.gitlab.com/blog/2017/11/27/go-tools-and-gitlab-how-to-do-continuous-integration-like-a-boss/ https://gitlab.com/hypnoglow/example-go-docker-gitlab/blob/master/.gitlab-ci.yml Somewhat useful: https://blog.lwolf.org/post/how-to-build-tiny-golang-docker-images-with-gitlab-ci/ https://angristan.xyz/build-push-docker-images-gitlab-ci/ https://docs.gitlab.com/ee/user/packages/container_registry/#use-images-from-gitlab-container-registry https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7 (it says to do sudo usermod -aG docker …

Read more

Another cool article on using PostgreSQL+pgBouncer with go

Extremely interesting and very practical talk about problems occurring with go+pgBouncer (in Russian, sorry). https://habr.com/ru/company/oleg-bunin/blog/461935/ And a video on that: https://www.youtube.com/watch?v=Uojy57I-xP0

env-file parser for Goland

You can use env-file parser for running and debugging your app in Jetbrains’ products like Goland. It’s pretty simple and works. https://github.com/Ashald/EnvFile

Golang patterns. Worker pool

Further reading: https://gobyexample.com/worker-pools

PgBouncer and prepared statements

In our system, we use connection pooler called PgBouncer as a proxy to PostgreSQL server. PgBouncer has two main modes Session pooling mode This mode is less performant (it’s a default mode). When a client connects, a server connection will be assigned to it for the whole duration it stays connected. So it does not …

Read more

Golang: testing http and grpc servers

HTTP server is quite easy to test — here is a nice video about it:

How go code is being compiled to assembler code

https://go.godbolt.org/z/31FyJ3 I was interested in comparing line 15 vs line 17 of the following code:

E2E tests in go

I tried it via ginkgo and gomega. It has Agouti with WebDriver support out of the box, but I didn’t use it as we have grpc API. That’s the example (table tests):

ORM for go

https://github.com/Masterminds/squirrel Never used it as we always write SQL queries manually. But looks okay for ORM (well, actually a query-builder).