fix docker

Dockerfile

@@ -4,13 +4,25 @@ WORKDIR /app
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN go build -ldflags="-s -w" -o spotify-ws .
+RUN go build -ldflags="-s -w" -o /app/spotify-ws .
+RUN go build -ldflags="-s -w" -o /app/healthcheck ./healthcheck
 
 FROM gcr.io/distroless/static:nonroot
+ARG BUILD_DATE
+ARG VCS_REF
+LABEL org.opencontainers.image.created=$BUILD_DATE
+LABEL org.opencontainers.image.authors="skidoodle"
+LABEL org.opencontainers.image.url="https://github.com/skidoodle/spotify-ws"
+LABEL org.opencontainers.image.documentation="https://github.com/skidoodle/spotify-ws/blob/main/readme.md"
+LABEL org.opencontainers.image.source="https://github.com/skidoodle/spotify-ws"
+LABEL org.opencontainers.image.revision=$VCS_REF
+LABEL org.opencontainers.image.title="spotify-ws"
+LABEL org.opencontainers.image.description="A WebSocket server that relays the current Spotify playing track to connected clients."
+LABEL org.opencontainers.image.licenses="AGPL-3.0"
 WORKDIR /app
 COPY --from=builder --chown=nonroot:nonroot /app/spotify-ws .
-
+COPY --from=builder --chown=nonroot:nonroot /app/healthcheck .
 EXPOSE 3000
-HEALTHCHECK --interval=30s --timeout=5s --start-period=5s CMD ["/spotify-ws", "-health"]
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s CMD ["/app/healthcheck"]
 USER nonroot:nonroot
-CMD ["/spotify-ws"]
+CMD ["/app/spotify-ws"]

compose.dev.yaml

@@ -0,0 +1,11 @@
+services:
+  spotify-ws:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: spotify-ws
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    env_file:
+        - .env

docker-compose.dev.yaml

@@ -1,17 +0,0 @@
-services:
-  spotify-ws:
-    build:
-      context: .
-      dockerfile: Dockerfile
-    container_name: spotify-ws
-    restart: unless-stopped
-    ports:
-      - "3000:3000"
-    environment:
-      - REFRESH_TOKEN=${REFRESH_TOKEN}
-      - CLIENT_SECRET=${CLIENT_SECRET}
-      - CLIENT_ID=${CLIENT_ID}
-      #- LOG_LEVEL=DEBUG
-      #- ALLOWED_ORIGINS=http://localhost:3000
-      #- SERVER_PORT=3000
-      #- RT=true

healthcheck/healthcheck.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"time"
+)
+
+const (
+	defaultPort    = "3000"
+	requestTimeout = 5 * time.Second
+)
+
+func main() {
+	ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
+	defer cancel()
+
+	if err := run(ctx); err != nil {
+		_, _ = fmt.Fprintf(os.Stderr, "health check failed: %v\n", err)
+		os.Exit(1)
+	}
+
+	os.Exit(0)
+}
+
+func run(ctx context.Context) error {
+	port := os.Getenv("SERVER_PORT")
+	if port == "" {
+		port = defaultPort
+	}
+
+	url := fmt.Sprintf("http://localhost:%s/health", port)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return fmt.Errorf("could not create request: %w", err)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("request to %s failed: %w", url, err)
+	}
+	defer func() {
+		if closeErr := resp.Body.Close(); closeErr != nil {
+			_, _ = fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if _, err := io.Copy(io.Discard, resp.Body); err != nil {
+		return fmt.Errorf("failed to discard response body: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("received non-200 status code: %d", resp.StatusCode)
+	}
+
+	return nil
+}