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Go CI/CD Playground

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# Go CI/CD Playground

This repository is a playground for experimenting with CI/CD in Go. It is a well-structured command-line application that serves a gRPC service and is an excellent example of how to structure a Go project.

It is not intended to be a complete application but a starting point for your projects.

## Table of Contents

- [CI/CD](#cicd)
  - [Actions](#actions)
    - [Release](#release)
- [Application](#application)
  - [Running the application](#running-the-application)
    - [Running locally](#running-locally)
    - [Running in a Docker container](#running-in-a-docker-container)
  - [Development](#development)
    - [Protobuf](#protobuf)
- [Tools](#tools)
- [Tips](#tips)
- [Code of Conduct](#code-of-conduct)

## CI/CD

It is all based on pushes and pull requests. Here is the list of actions triggered based on each event:

- When a tag is pushed: `lint`, `release`, and `security` actions are triggered.
- When a commit is pushed to the `main` branch or a pull request is opened: `build`, `lint`, `security`, and `test` actions are triggered.

> **Note**
>
> You need to configure the following secrets in the repository settings:
>
> - `DOCKERHUB_USERNAME`: The username of the Docker Hub account.
> - `DOCKERHUB_TOKEN`: The token of the Docker Hub account.
> - `GITLEAKS_NOTIFY_USER_LIST`: The list of users to notify when a secret leak is found.

### Actions

- The [build action](.github/workflows/build.yml) builds the binaries for checking the code.
- The [lint action](.github/workflows/lint.yml) runs `golangci-lint` on the code and `buf` on the protobuf files ([example](https://github.com/calmonr/cicd/pull/3)).
- The [release action](.github/workflows/release.yml) runs `goreleaser` to build and publish the binaries ([examples](https://github.com/calmonr/cicd/releases)).
- The [security action](.github/workflows/security.yml) runs `gitleaks` to check for secret leaks ([example](https://github.com/calmonr/cicd/pull/2)).
- The [test action](.github/workflows/test.yml) runs the unit tests.

> **Note**
>
> You can use [act](https://github.com/nektos/act) to run GitHub Actions locally.

#### Release

`goreleaser` is the core of the release process. It is configured in the [`.goreleaser.yaml`](.goreleaser.yaml) file.

For multiple architectures, all Docker images are pushed to the GitHub Container Registry and Docker Hub.

The binary is built using the `ldflags` flag to embed the version, commit and build time in the binary. The `version` command or the `--version` can print this information.

There are also a few completion scripts for the `bash`, `zsh`, and `fish` shells in the released archives.

> **Note**
>
> The releases are created as drafts. You need to manually publish them, allowing you to review the release notes before publishing.

## Application

The application is a **simple** gRPC server with a greeting service. It has a single endpoint, `Hi`, which takes a `HiRequest` and returns a `HiResponse`. The `HiRequest` contains a `name` field, which is used to construct the `HiResponse` message.

### Running the application

You can either run the application locally or in a Docker container.

#### Running locally

It can be configured using environment variables or a configuration file. The configuration file will only be used if the `--config-file` flag is provided.

> **Note**
>
> There is a sample configuration file in the `configs` directory.

Using environment variables:

```bash
export PLAYGROUND_LOG_LEVEL=info
export PLAYGROUND_GRPC_SERVER_ADDRESS=:50051
export PLAYGROUND_GRPC_SERVER_NETWORK=tcp

go run ./cmd/playground/main.go
```

Using a configuration file:

```bash
go run ./cmd/playground/main.go --config-file ./configs/development.yaml
```

#### Running in a Docker container

The [Dockerfile](./Dockerfile) is located at the repository's root. It is a multi-stage build that builds the binary and then copies it to a scratch image.

First, we need to build the image:

```bash
docker build -t playground .
```

Then we can run the container:

```bash
docker run \
  -e PLAYGROUND_LOG_LEVEL=info \
  -e PLAYGROUND_GRPC_SERVER_ADDRESS=:50051 \
  -e PLAYGROUND_GRPC_SERVER_NETWORK=tcp \
  -p 50051:50051 \
  playground
```

> **Note**
>
> There is a `docker-compose.yml` that you can use as well.
>
> ```bash
> docker-compose up -d
> ```
>
> You can switch from `docker` to `nerdctl` if you use Containerd.

### Development

You will need to install a few tools before you can start developing the application.

```bash
sh ./scripts/install-tools.sh
```

#### Protobuf

[Buf](https://docs.buf.build/introduction) is used to lint the protobuf definitions and generate source code from them.

You can find the protobuf definitions in the `proto` directory.

Before we continue, let us verify that everything is set up correctly:

```console
buf build
```

You can run all of the configured lint rules by running this command:

```console
buf lint
```

Now we can generate the source code for our service:

```console
buf generate -o pkg/proto proto/internal
```

## Tools

Here is a list of tools used in this repository:

> **Warning**
>
> I might have missed some, so feel free to open a pull request if you think something is missing. :nerd_face:

- [x] [GoReleaser](https://goreleaser.com/)
- [x] [golangci-lint](https://golangci-lint.run/)
- [x] [EditorConfig](https://editorconfig.org/)
- [x] [Gitleaks](https://gitleaks.io/)
- [x] [Cobra](https://cobra.dev/)
- [x] [Viper](https://github.com/spf13/viper)
- [x] [zap](https://github.com/uber-go/zap)
- [x] [gRPC](https://grpc.io/)
  - [x] [Buf](https://buf.build/)

## Tips

It would be best if you used [pre-commit](https://pre-commit.com/) to run linting and testing on your project; this way, you can catch problems before they are committed.

```yaml
---
repos:
  - repo: https://github.com/golangci/golangci-lint
    rev: v1.49.0
    hooks:
      - id: golangci-lint
  - repo: https://github.com/zricethezav/gitleaks
    rev: v8.13.0
    hooks:
      - id: gitleaks
default_install_hook_types: [pre-commit]
minimum_pre_commit_version: 2.20.0
```

## Code of Conduct

This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.

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