Configure Go-based containers for auth and gateway

docker-compose.yml

@@ -15,23 +15,35 @@ services:
     networks:
       - backend
 
-  sc-api-getaway:
-    build: ./sc-api-getaway
-    container_name: api-gateway
+  sc-auth:
+    build:
+      context: .
+      dockerfile: sc-auth/Dockerfile
+    container_name: sc-auth
     depends_on:
       - postgres
     environment:
-      - DATABASE_URL=postgresql://root:secret@localhost:5433/sc_db?sslmode=disable
+      SERVER_PORT: "50051"
+      DB_SOURCE: postgresql://root:secret@postgres:5432/sc_db?sslmode=disable
     ports:
-      - "8000:8000"
+      - "50051:50051"
     networks:
       - backend
 
-  nginx:
-    build: ./sc-api-getaway
-    container_name: nginx
+  sc-api-getaway:
+    build:
+      context: .
+      dockerfile: sc-api-getaway/Dockerfile
+    container_name: api-gateway
+    depends_on:
+      - postgres
+      - sc-auth
+    environment:
+      SERVER_PORT: "8000"
+      DB_SOURCE: postgresql://root:secret@postgres:5432/sc_db?sslmode=disable
+      GRPC_AUTH_PORT: sc-auth:50051
     ports:
-      - "80:80"
+      - "8000:8000"
     networks:
       - backend
 
@@ -88,4 +100,4 @@ networks:
   backend:
 
 volumes:
-  pgdata:
+  pgdata:

sc-api-getaway/Dockerfile

@@ -1,5 +1,20 @@
-FROM nginx:alpine
-COPY nginx/nginx.conf /etc/nginx/nginx.conf
-COPY cmd/general /usr/share/nginx/html
-WORKDIR /usr/share/nginx/html
-CMD ["nginx", "-g", "daemon off;"]
+# syntax=docker/dockerfile:1.4
+
+FROM golang:1.22 AS builder
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/api-gateway ./sc-api-getaway/cmd/general
+
+FROM gcr.io/distroless/base-debian12:nonroot AS final
+WORKDIR /app
+
+COPY --from=builder /out/api-gateway /app/api-gateway
+
+EXPOSE 8000
+
+ENTRYPOINT ["/app/api-gateway"]

sc-api-getaway/cmd/general/main.go

@@ -26,13 +26,14 @@
 		os.Exit(1)
 	}
 
-	authConn, err := grpc.NewClient("localhost"+":"+newConfig.GrpcAuthPort, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	conn, err := grpc.Dial(newConfig.GrpcAuthTarget, grpc.WithTransportCredentials(insecure.NewCredentials()))
+
 	if err != nil {
 		log.Fatalf("failed to connect to Auth Service: %v", err)
 	}
 	defer authConn.Close()
 
 	postConn, err := grpc.NewClient("localhost"+":"+newConfig.GrpcPostPort, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		log.Fatalf("failed to connect to Post Service: %v", err)
 	}

sc-api-getaway/internal/config/config.go

@@ -1,18 +1,18 @@
 package config
 
 import (
+	"errors"
 	"log"
 
 	"github.com/spf13/viper"
 )
 
 type Config struct {
-  EnvType       string `mapstructure:"ENV_TYPE"`
-  ServerPort    string `mapstructure:"SERVER_PORT"`
-  DBSource      string `mapstructure:"DB_SOURCE"`
-  GrpcAuthPort  string `mapstructure:"GPRC_AUTH_PORT"`
-  GrpcPostPort  string `mapstructure:"GRPC_POST_PORT"`
-  WebappBaseUrl string `mapstructure:"WEBAPP_BASE_URL"`
+	EnvType        string `mapstructure:"ENV_TYPE"`
+	ServerPort     string `mapstructure:"SERVER_PORT"`
+	DBSource       string `mapstructure:"DB_SOURCE"`
+	GrpcAuthTarget string `mapstructure:"GRPC_AUTH_PORT"`
+	WebappBaseUrl  string `mapstructure:"WEBAPP_BASE_URL"`
 }
 
 func LoadConfig(path string) (config Config, err error) {
@@ -22,8 +22,11 @@ func LoadConfig(path string) (config Config, err error) {
 
 	err = viper.ReadInConfig()
 	if err != nil {
-		log.Fatalf("could not loadconfig: %v", err)
-		return
+		var configErr viper.ConfigFileNotFoundError
+		if !errors.As(err, &configErr) {
+			log.Fatalf("could not loadconfig: %v", err)
+			return
+		}
 	}
 
 	err = viper.Unmarshal(&config)

sc-auth/Dockerfile

@@ -1,4 +1,27 @@
-FROM ubuntu:latest
-LABEL authors="karadyauran"
+# syntax=docker/dockerfile:1.4
 
-ENTRYPOINT ["top", "-b"]
+FROM golang:1.22 AS builder
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/auth-service ./sc-auth/cmd/general
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/migrate github.com/golang-migrate/migrate/v4/cmd/migrate
+
+FROM busybox:1.36.1 AS busybox
+
+FROM gcr.io/distroless/base-debian12:nonroot AS final
+WORKDIR /app
+
+COPY --from=builder /out/auth-service /app/auth-service
+COPY --from=builder /out/migrate /bin/migrate
+COPY --from=builder /src/sc-auth/internal/db/migration /app/internal/db/migration
+COPY --from=busybox /bin/busybox /busybox
+COPY --chmod=0755 sc-auth/entrypoint.sh /entrypoint.sh
+
+ENV PATH="/bin:${PATH}"
+
+ENTRYPOINT ["/entrypoint.sh"]

sc-auth/entrypoint.sh

@@ -1,10 +1,9 @@
-#!/bin/sh
+#!/busybox/sh
+set -euo pipefail
 
-go install -tags 'postgres' github.com/golang-migrate/migrate/v4/cmd/migrate@latest
-migrate create -ext sql -dir internal/db/migration -seq init_schema
+MIGRATION_DIR="${MIGRATION_DIR:-/app/internal/db/migration}"
+DB_SOURCE="${DB_SOURCE:?DB_SOURCE environment variable is required}"
 
-# Perform migrations
-migrate -path internal/db/migration -database "postgresql://root:secret@postgres-auth:5432/sc_db?sslmode=disable" -verbose up
+/bin/migrate -path "${MIGRATION_DIR}" -database "${DB_SOURCE}" up
 
-# Start the server
-./main
+exec /app/auth-service

sc-auth/internal/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"log"
 
 	"github.com/spf13/viper"
@@ -19,8 +20,11 @@ func LoadConfig(path string) (config Config, err error) {
 
 	err = viper.ReadInConfig()
 	if err != nil {
-		log.Fatalf("could not loadconfig: %v", err)
-		return
+		var configErr viper.ConfigFileNotFoundError
+		if !errors.As(err, &configErr) {
+			log.Fatalf("could not loadconfig: %v", err)
+			return
+		}
 	}
 
 	err = viper.Unmarshal(&config)