v2: App rewritten in Go (#25)

.codecov.yml

@@ -0,0 +1,26 @@
+# Docs: <https://docs.codecov.io/docs/commit-status>
+
+coverage:
+  # coverage lower than 50 is red, higher than 90 green
+  range: 30..80
+
+  status:
+    project:
+      default:
+        # Choose a minimum coverage ratio that the commit must meet to be considered a success.
+        #
+        # `auto` will use the coverage from the base commit (pull request base or parent commit) coverage to compare
+        # against.
+        target: auto
+
+        # Allow the coverage to drop by X%, and posting a success status.
+        threshold: 5%
+
+        # Resulting status will pass no matter what the coverage is or what other settings are specified.
+        informational: true
+
+    patch:
+      default:
+        target: auto
+        threshold: 5%
+        informational: true

.dockerignore

@@ -1,7 +1,14 @@
 .dockerignore
+Dockerfile
 .github
 .git
 .gitignore
-/generator/node_modules
-/generator/*.log
-/out
+.editorconfig
+.idea
+.vscode
+test
+temp
+tmp
+LICENSE
+Makefile
+error-pages

.editorconfig

@@ -1,3 +1,5 @@
+# EditorConfig docs: <https://editorconfig.org/>
+
 root = true
 
 [*]
@@ -11,5 +13,5 @@ trim_trailing_whitespace = true
 [*.{yml, yaml, sh, conf}]
 indent_size = 2
 
-[Makefile]
+[{Makefile, go.mod, *.go}]
 indent_style = tab

.github/workflows/release.yml

@@ -5,100 +5,96 @@ on:
     types: [published]
 
 jobs:
-  demo:
-    name: Update demonstration, hosted on github pages
+  build:
+    name: Build for ${{ matrix.os }} (${{ matrix.arch }})
     runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [linux, darwin] # linux, freebsd, darwin, windows
+        arch: [amd64]  # amd64, 386
     steps:
-      - name: Check out code
-        uses: actions/checkout@v2
-
-      - name: Setup NodeJS
-        uses: actions/setup-node@v1 # Action page: <https://github.com/actions/setup-node>
-        with:
-          node-version: 15
+      - uses: actions/setup-go@v2
+        with: {go-version: 1.17.1}
 
-      - uses: actions/cache@v2
-        with:
-          path: '**/node_modules'
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+      - uses: actions/checkout@v2
 
-      - name: Install dependencies
-        working-directory: generator
-        run: yarn install
-
-      - name: Generate pages
-        run: ./generator/generator.js -i -c ./config.json -o ./out
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v2
-        with:
-          name: content
-          path: out/
-          retention-days: 1
+      - uses: gacts/github-slug@v1
+        id: slug
 
-      - name: Switch to github pages branch
-        uses: actions/checkout@v2
-        with:
-          ref: gh-pages
-
-      - name: Download artifact
-        uses: actions/download-artifact@v2
+      - name: Generate builder values
+        id: values
+        run: echo "::set-output name=binary-name::error-pages-${{ matrix.os }}-${{ matrix.arch }}"
+
+      - name: Build application
+        env:
+          GOOS: ${{ matrix.os }}
+          GOARCH: ${{ matrix.arch }}
+          CGO_ENABLED: 0
+          LDFLAGS: -s -w -X github.com/tarampampam/error-pages/internal/version.version=${{ steps.slug.outputs.version }}
+        run: go build -trimpath -ldflags "$LDFLAGS" -o "./${{ steps.values.outputs.binary-name }}" ./cmd/error-pages/
+
+      - name: Upload binary file to release
+        uses: svenstaro/upload-release-action@v2
         with:
-          name: content
-
-      - name: Setup git
-        run: |
-          git config --global user.name "$GITHUB_ACTOR"
-          git config --global user.email 'actions@github.com'
-          git remote add github "https://$GITHUB_ACTOR:$GITHUB_TOKEN@github.com/$GITHUB_REPOSITORY.git"
-
-      - name: Stage changes
-        run: git add .
-
-      - name: Commit changes
-        run: git commit --allow-empty -m "Deploying ${GITHUB_SHA} to Github Pages"
-
-      - name: Push changes
-        run: git push github --force
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: ${{ steps.values.outputs.binary-name }}
+          asset_name: ${{ steps.values.outputs.binary-name }}
+          tag: ${{ github.ref }}
 
   docker-image:
     name: Build docker image
     runs-on: ubuntu-20.04
     steps:
-      - name: Check out code
-        uses: actions/checkout@v2
+      - uses: actions/checkout@v2
+
+      - uses: gacts/github-slug@v1
+        id: slug
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1 # Action page: <https://github.com/docker/setup-qemu-action>
+      - uses: docker/setup-qemu-action@v1 # Action page: <https://github.com/docker/setup-qemu-action>
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1 # Action page: <https://github.com/docker/setup-buildx-action>
+      - uses: docker/setup-buildx-action@v1 # Action page: <https://github.com/docker/setup-buildx-action>
 
-      - name: Login to default Container Registry
-        uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
+      - uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
         with:
           username: ${{ secrets.DOCKER_LOGIN }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
+      - uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GHCR_PASSWORD }}
 
-      - name: Generate builder values
-        id: values
-        run: echo "::set-output name=version::${GITHUB_REF##*/[vV]}" # `/refs/tags/v1.2.3` -> `1.2.3`
+      - uses: docker/build-push-action@v2 # Action page: <https://github.com/docker/build-push-action>
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          platforms: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
+          build-args: "APP_VERSION=${{ steps.slug.outputs.version }}"
+          tags: |
+            tarampampam/error-pages:${{ steps.slug.outputs.version }}
+            tarampampam/error-pages:latest
+            ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:${{ steps.slug.outputs.version }}
+            ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:latest
 
-      - name: Build image
+  demo:
+    name: Update the demonstration
+    runs-on: ubuntu-20.04
+    needs: [docker-image]
+    steps:
+      - uses: gacts/github-slug@v1
+        id: slug
+
+      - name: Take rendered templates from the built docker image
         run: |
-          docker buildx build \
-            --platform "linux/amd64,linux/arm64/v8,linux/arm/v6,linux/arm/v7" \
-            --tag "tarampampam/error-pages:${{ steps.values.outputs.version }}" \
-            --tag "tarampampam/error-pages:latest" \
-            --tag "ghcr.io/${{ github.actor }}/error-pages:${{ steps.values.outputs.version }}" \
-            --tag "ghcr.io/${{ github.actor }}/error-pages:latest" \
-            --file ./Dockerfile \
-            --push \
-            .
+          docker create --name img ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:${{ steps.slug.outputs.version }}
+          docker cp img:/opt/html ./out
+          docker rm -f img
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./out