ci: only deploy on relevant code changes

Reduction of 352 MiB -> 8.22 MiB

Reviewed-on: #29
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

.gitea/workflows/cd.yaml

@@ -9,6 +9,27 @@ env:
   DOCKER_REGISTRY: gitea.t000-n.de
 
 jobs:
+  check-changes:
+    name: Check changes
+    runs-on: ubuntu-latest
+    outputs:
+      changes: ${{ steps.filter.outputs.code }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Get changes
+        id: filter
+        uses: dorny/paths-filter@v3
+        with:
+          filters: |
+            code:
+              - 'go.mod'
+              - 'go.sum'
+              - '**/*.go'
+              - 'config.example.yaml'
+              - 'Dockerfile'
+              - 'Makefile'
+
   test:
     name: test
     runs-on: ubuntu-latest
@@ -44,18 +65,58 @@ jobs:
 
   build_and_push:
     name: Build and push
+    strategy:
+      matrix:
+        arch: [amd64, arm64]
     needs:
       - test
+      - check-changes
+    if: ${{ needs.check-changes.outputs.code == 'true' }}
+    runs-on:
+      - ubuntu-latest
+      - linux_${{ matrix.arch }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Get Metadata
+        id: meta
+        run: |
+          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}' | tr '[:upper:]' '[:lower:]') >> $GITHUB_OUTPUT
+          echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/${{ matrix.arch }}
+          push: true
+          provenance: false
+          build-args: GOARCH=${{ matrix.arch }}
+          tags: |
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-${{ matrix.arch }}
+
+  create_manifest:
+    name: Create manifest
+    needs:
+      - build_and_push
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+      - name: Get Metadata
+        id: meta
+        run: |
+          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}' | tr '[:upper:]' '[:lower:]') >> $GITHUB_OUTPUT
+          echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
 
       - name: Login to Registry
         uses: docker/login-action@v2
@@ -64,21 +125,10 @@ jobs:
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
-      - name: Get Metadata
-        id: meta
+      - name: Create manifest
         run: |
-          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}' | tr '[:upper:]' '[:lower:]') >> $GITHUB_OUTPUT
-          echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
+          docker manifest create ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:latest \
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-amd64 \
+            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}-arm64
 
-      - name: Build and push
-        uses: docker/build-push-action@v4
-        with:
-          context: .
-          file: ./Dockerfile
-          platforms: |
-            linux/amd64
-            linux/arm64
-          push: true
-          tags: |
-            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}
-            ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:latest
+          docker manifest push ${{ env.DOCKER_REGISTRY }}/t.behrendt/${{ steps.meta.outputs.REPO_NAME }}:latest

Dockerfile

@@ -1,13 +1,14 @@
-FROM golang:1.23-alpine
+FROM golang:1.23-alpine as build
+
+ARG GOARCH=amd64
 
 WORKDIR /app
-
 COPY go.mod go.sum ./
-
 RUN go mod download
-
 COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${GOARCH} \
+    go build -trimpath -ldflags="-s -w" -o main .
 
-RUN go build -o main .
-
-CMD ["./main"]
+FROM gcr.io/distroless/static-debian12
+COPY --from=build /app/main /
+CMD ["/main"]

README.md

@@ -38,6 +38,7 @@ domains:
       - www
 check_interval: 0 0 0/6 * * * *
 mode: Scheduled
+log_level: info
 ```
 
 The config file is expected to be in the same directory as the binary and called `config.yaml`. For the OCR image, the root directory is `/app`.

config.example.yaml

@@ -21,3 +21,4 @@ domains:
       - www
 check_interval: 0 0 0/6 * * * *
 mode: Scheduled
+log_level: info

pkg/realDynDns/realDynDns.go

@@ -3,6 +3,7 @@ package realDynDns
 import (
 	"fmt"
 	"log/slog"
+	"sync"
 	"time"
 
 	"realdnydns/pkg/config"
@@ -70,10 +71,17 @@ func (c *ChangeDetector) detectAndApplyChanges() (int, error) {
 		return 0, err
 	}
 
-	var numberUpdated int
+	var wg sync.WaitGroup
+
+	numberUpdatedChannel := make(chan int)
 
 	for _, domain := range c.domains {
 		for _, subdomain := range domain.Subdomains {
+			wg.Add(1)
+
+			go func(domain config.DomainConfig, subdomain string) {
+				defer wg.Done()
+
 				c.logger.Info("Checking record",
 					slog.String("tld", domain.TLD),
 					slog.String("subdomain", subdomain),
@@ -85,7 +93,7 @@ func (c *ChangeDetector) detectAndApplyChanges() (int, error) {
 						slog.String("tld", domain.TLD),
 						slog.String("subdomain", subdomain),
 					)
-				continue
+					return
 				}
 
 				if currentRecord.IP != externalIp.String() {
@@ -104,7 +112,7 @@ func (c *ChangeDetector) detectAndApplyChanges() (int, error) {
 						c.logger.Warn("Failed to send notification",
 							slog.String("error", err.Error()),
 						)
-					continue
+						return
 					}
 
 					c.logger.Info("Updating record",
@@ -120,11 +128,23 @@ func (c *ChangeDetector) detectAndApplyChanges() (int, error) {
 							slog.String("tld", domain.TLD),
 							slog.String("subdomain", subdomain),
 						)
-					continue
+						return
 					}
-				numberUpdated++
+
+					numberUpdatedChannel <- 1
+				}
+			}(domain, subdomain)
 		}
 	}
+
+	go func() {
+		wg.Wait()
+		close(numberUpdatedChannel)
+	}()
+
+	numberUpdated := 0
+	for v := range numberUpdatedChannel {
+		numberUpdated += v
 	}
 
 	c.logger.Info("Run completed", slog.Int("number_of_changes", numberUpdated))

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}