feat: Initial commit

.changelog-generator.yaml

@@ -0,0 +1,14 @@
+# yaml-language-server: $schema=https://gabe565.github.io/changelog-generator/config.schema.json
+filters:
+  exclude:
+    - "^docs"
+    - "^test"
+groups:
+  - title: Features
+    order: 0
+    regexp: "^(feat)"
+  - title: Fixes
+    order: 1
+    regexp: "^(fix|perf)"
+  - title: Others
+    order: 999

.dockerignore

@@ -0,0 +1,9 @@
+.changelog-generator.yaml
+.git/
+.github/
+.gitignore
+.golangci.yaml
+.idea/
+.pre-commit-config.yaml
+README.md
+payloads/

.env.example

@@ -0,0 +1,2 @@
+SLACK_API_TOKEN=
+SLACK_CHANNEL=

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @clevyr/devops

.github/renovate.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>clevyr/renovate-config"
+  ],
+  "regexManagers": [
+    {
+      "fileMatch": "Dockerfile$",
+      "matchStrings": [
+        "ARG RIE_VERSION=(?<currentValue>.*)"
+      ],
+      "datasourceTemplate": "github-releases",
+      "depNameTemplate": "aws/aws-lambda-runtime-interface-emulator"
+    }
+  ]
+}

.github/workflows/build.yml

@@ -0,0 +1,90 @@
+name: Build
+
+on: push
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: false
+      - name: Lint
+        uses: golangci/golangci-lint-action@v5
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - name: Test
+        run: go test ./...
+
+  build:
+    name: Build Image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/clevyr/lambda-cloudwatch-slack
+          tags: |
+            type=raw,priority=1000,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=beta,enable=${{ github.ref_name == 'main' }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+      - name: Build and Push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          pull: true
+          push: ${{ steps.meta.outputs.tags != '' }}
+          platforms: linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    needs: [lint, test, build]
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Generate Changelog
+        id: changelog
+        uses: gabe565/changelog-generator@v0
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        with:
+          body: ${{ steps.changelog.outputs.changelog }}

.gitignore

@@ -0,0 +1,12 @@
+# Editor
+.idea
+
+# Compiled
+coverage.out
+dist/
+lambda-cloudwatch-slack
+out/
+
+# Config
+.env*
+!.env.example

.golangci.yaml

@@ -0,0 +1,88 @@
+run:
+  timeout: 5m
+
+issues:
+  max-same-issues: 50
+  exclude-rules:
+    - path: "_test\\.go"
+      linters:
+        - dupl
+
+linters:
+  enable:
+    - asasalint
+    - asciicheck
+    - bidichk
+    - bodyclose
+    - copyloopvar
+    - decorder
+    - dupl
+    - durationcheck
+    - errcheck
+    - errname
+    - errorlint
+    - execinquery
+    - exportloopref
+    - forbidigo
+    - gci
+    - ginkgolinter
+    - gocheckcompilerdirectives
+    - gochecknoglobals
+    - gochecknoinits
+    - gochecksumtype
+    - goconst
+    - gocritic
+    - gocyclo
+    - godox
+    - goerr113
+    - gofumpt
+    - goheader
+    - goimports
+    - gomoddirectives
+    - gomodguard
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - gosmopolitan
+    - govet
+    - importas
+    - inamedparam
+    - ineffassign
+    - interfacebloat
+    - intrange
+    - loggercheck
+    - makezero
+    - mirror
+    - musttag
+    - nakedret
+    - nilerr
+    - nilnil
+    - noctx
+    - nolintlint
+    - nonamedreturns
+    - nosprintfhostport
+    - paralleltest
+    - perfsprint
+    - prealloc
+    - predeclared
+    - promlinter
+    - protogetter
+    - reassign
+    - revive
+    - rowserrcheck
+    - sloglint
+    - spancheck
+    - sqlclosecheck
+    - staticcheck
+    - stylecheck
+    - tenv
+    - testableexamples
+    - testifylint
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - usestdlibvars
+    - wastedassign
+    - whitespace
+    - zerologlint

.pre-commit-config.yaml

@@ -0,0 +1,7 @@
+repos:
+  - repo: https://github.com/TekWizely/pre-commit-golang
+    rev: v1.0.0-rc.1
+    hooks:
+      - id: go-mod-tidy-repo
+      - id: golangci-lint-mod
+        args: [--fix]

Dockerfile

@@ -0,0 +1,56 @@
+#syntax=docker/dockerfile:1.7
+
+FROM --platform=$BUILDPLATFORM golang:1.22.2-alpine as builder
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY cmd cmd
+COPY internal internal
+COPY *.go ./
+# Set Golang build envs based on Docker platform string
+ARG TARGETPLATFORM
+RUN --mount=type=cache,target=/root/.cache <<EOT
+  set -eux
+
+  case "$TARGETPLATFORM" in
+    'linux/amd64') export GOARCH=amd64 ;;
+    'linux/arm/v6') export GOARCH=arm GOARM=6 ;;
+    'linux/arm/v7') export GOARCH=arm GOARM=7 ;;
+    'linux/arm64') export GOARCH=arm64 ;;
+    *) echo "Unsupported target: $TARGETPLATFORM" && exit 1 ;;
+  esac
+
+  export CGO_ENABLED=0
+  go build -ldflags='-w -s' -tags lambda.norpc -trimpath -o cloudwatch-slack-alerts .
+EOT
+
+FROM alpine:3.19 AS rie
+WORKDIR /app
+ARG TARGETPLATFORM
+ARG RIE_VERSION=v1.18
+RUN <<EOT
+  set -eux
+
+  case "$TARGETPLATFORM" in
+    'linux/amd64') export SUFFIX=x86_64 ;;
+    'linux/arm64') export SUFFIX=arm64 ;;
+    *) echo "Unsupported target: $TARGETPLATFORM" && exit 1 ;;
+  esac
+
+  wget \
+    -O aws-lambda-rie \
+    "https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/download/$RIE_VERSION/aws-lambda-rie-$SUFFIX"
+  chmod +x aws-lambda-rie
+EOT
+
+FROM alpine:3.19 AS base
+WORKDIR /app
+COPY --from=builder /app/cloudwatch-slack-alerts .
+
+FROM base AS local
+COPY --from=rie /app/aws-lambda-rie .
+
+FROM base
+CMD ["./cloudwatch-slack-alerts"]

cmd/cmd.go

@@ -0,0 +1,29 @@
+package cmd
+
+import (
+	"context"
+
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/clevyr/cloudwatch-slack-alerts/internal/alert"
+	"github.com/clevyr/cloudwatch-slack-alerts/internal/config"
+	"github.com/spf13/cobra"
+)
+
+func NewCommand() *cobra.Command {
+	conf := config.New()
+
+	cmd := &cobra.Command{
+		Use:   "cloudwatch-slack-alerts",
+		Short: "Send AWS CloudWatch notifications to a Slack channel using Lambda",
+		PreRunE: func(cmd *cobra.Command, _ []string) error {
+			return conf.Load(cmd)
+		},
+		Run: func(_ *cobra.Command, _ []string) {
+			lambda.Start(alert.Handler(conf))
+		},
+	}
+
+	conf.RegisterFlags(cmd)
+	cmd.SetContext(config.NewContext(context.Background(), conf))
+	return cmd
+}

cmd/cmd_test.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/clevyr/cloudwatch-slack-alerts/internal/config"
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCmdDbFlags(t *testing.T) {
+	t.Setenv("SLACK_API_TOKEN", "123")
+	t.Setenv("SLACK_CHANNEL", "alerts")
+
+	rootCmd := NewCommand()
+	rootCmd.Run = func(_ *cobra.Command, _ []string) {}
+
+	require.NoError(t, rootCmd.Execute())
+
+	conf, ok := config.FromContext(rootCmd.Context())
+	require.True(t, ok)
+	assert.Equal(t, "123", conf.SlackAPIToken)
+	assert.Equal(t, "alerts", conf.SlackChannel)
+}

compose.yaml

@@ -0,0 +1,18 @@
+services:
+  app:
+    image: ghcr.io/clevyr/cloudwatch-slack-alerts:local
+    build:
+      context: .
+      target: local
+    env_file:
+      - .env
+    entrypoint:
+      - ./aws-lambda-rie
+    command:
+      - ./cloudwatch-slack-alerts
+    ports:
+      - 127.0.0.1:9000:8080
+    develop:
+      watch:
+        - action: rebuild
+          path: .