Author Archives: bullgare

DDD/Clean Architecture go linters

Origin (in Russian) Tech talk (paid access only, unfortunately): https://conf.ontico.ru/online/hl2023/details/5206668 Presentation: https://docs.google.com/presentation/d/1n5jCie-9tBw3QEEF6NsNco4mS9xYkg52/edit#slide=id.g29c6e2d30cb_0_169 Linters Dependencies between layers: https://github.com/OpenPeeDeeP/depguard https://github.com/fe3dback/go-arch-lint/ Others: https://github.com/nishanths/exhaustive — to check using all microtypes in enums/switches. https://github.com/go-simpler/musttag + https://github.com/maranqz/golangconf2023/blob/main/tags/rules.go — to prevent using struct tags in Domain models (Value Objects). https://github.com/maranqz/gopublicfield — to prevent changing Value Objects (Domain models) from outside of the …

Protobuf: safer usage for buf

A drop-in replacement for buf issued by Ozon. Repository: https://github.com/easyp-tech/server Presentation (for subscribers only, unfortunately): https://conf.ontico.ru/online/hl2023/details/5206585

Maps internals in Go

Good article in Russian: https://habr.com/ru/articles/457728/ Nice video (also in Russian): https://www.youtube.com/watch?v=P_SXTUiA-9Y

mounterbank for mocking and stubbing http services (rest+graphql+grpc)

http://www.mbtest.org/docs/api/stubs can be used to stub http(s)/tcp/smtp protocols. And has community plugins for grpc, graphql, websockets. You can configure it with imposters.ejs like below:

{
  "port": 80,
  "protocol": "http",
  "defaultResponse": {
    "statusCode": 404,
    "headers": {}
  },
  "stubs": [
    <% include stubs/service1.json %>,
    <% include stubs/service2.json %>,
    <% include stubs/service3.json %>
  ]
}

{

"port": 80,

"protocol": "http",

"defaultResponse": {

"statusCode": 404,

"headers": {}

"stubs": [

<% include stubs/service1.json %>,

<% include stubs/service2.json %>,

<% include stubs/service3.json %>

]

}

docker-compose.yml

version: "3.5"

services:
  mountebank:
    container_name: mountebank
    image: jkris/mountebank:latest
    volumes:
      - ./:/mountebank
    ports:
      - "15050:80"
    command: --configfile /mountebank/imposters.ejs --allowInjection

version: "3.5"

services:

mountebank:

container_name: mountebank

image: jkris/mountebank:latest

volumes:

- ./:/mountebank

ports:

- "15050:80"

command: --configfile /mountebank/imposters.ejs --allowInjection

HTTP Toolkit — another alternative to Charles Proxy for http calls interception

https://httptoolkit.com/ It has a free version which does something similar to Charles Proxy, so you can hack into the middle of any request/response according to the rules specified.

YouType to show flag icon for current locale on MacOS

It has reacher functionality, but I use it only to show a flag for my current locale in a tray. https://github.com/freefelt/YouType

Add new video sticker pack to telegram

If you have an animated gif-file, you can convert it to webm video respecting rules described in the docs (https://core.telegram.org/stickers#video-stickers-and-emoji): For stickers, one side must be exactly 512 pixels in size – the other side can be 512 pixels or less. For emoji, the video must be exactly 100×100 pixels in size Video duration must …

Protobuf: add header parameters

They finally added it to the grpc-gateway: https://github.com/grpc-ecosystem/grpc-gateway/pull/3010/files#diff-c255ac405628aada46c25a2c9765605e9f823bc523d3739fd3fa71d4bcbf5c99. So, to use it you can just update to the version 2.14.0 or above — https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v2.14.0, and add something like this to your protofile:

        option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
            summary: "Create a new foo.";
            parameters: {
                headers: {
                    name: "My-Custom-Header";
                    description: "Some custom header description";
                    required: true;
                };
            };
        };

option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {

summary: "Create a new foo.";

parameters: {

headers: {

name: "My-Custom-Header";

description: "Some custom header description";

required: true;

};

Go scheduler details

Scheduler was implemented by Dmitry Vyukov in go 1.1 and lives in runtime/proc.go. Good resources https://www.youtube.com/watch?v=-K11rY57K7k — video by Dmitry Vyukov (slides as pdf) https://www.ardanlabs.com/blog/2018/08/scheduling-in-go-part2.html — nice article by Bill Kennedy in 3 parts. Most of the images below are taken from this article. Main ideas Goroutines are very light weight (~2KB+) and very cheap …

Golang. Adding a json body to POST request in protofile

It could be a bit tricky, and I failed to find a good example for it.