assignment-4

Author: pratikpjain

assignment-4/Dockerfile

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+FROM golang:1.18-alpine
+RUN mkdir /backend-app
+COPY  . /backend-app
+WORKDIR /backend-app
+RUN go build -o main .
+CMD ["/backend-app/main"]

assignment-4/backend-app/backend-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend-app-deploy
+  labels:
+    app: backend-app
+spec:
+  selector:
+    matchLabels:
+      app: backend-app
+  template:
+    metadata:
+      labels:
+        app: backend-app
+    spec:
+      containers:
+      - name: backend-app
+        image: {{ .Values.backend-app.image }}
+        env:
+        - name: USERS_SVC_HOST
+          value: "backend-app-host"
+        - name: USERS_SVC_PORT
+          value: "8080"
+        ports:
+        - containerPort: 8080
+          name: backend-app

assignment-4/backend-app/backend-svc.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: backendappsvc
+  labels:
+        app: backend-app
+spec:
+  ports:
+  - port: {{ .Values.backend-app.servicePort }}
+    targetPort: 8080
+    protocol: TCP
+  selector:
+    app: backend-app

assignment-4/backend-app/deploy.sh

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+kubectl create -f backendapp-deploy.yaml
+
+kubectl create -f backendapp-svc.yaml
+
+kubectl get pods,deployments,svc -l app=backend-app

assignment-4/backend-app/postgres-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  selector:
+    matchLabels:
+      app: postgres
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+      - image: postgres:alpine
+        name: postgres
+        env:
+        - name: POSTGRES_DB
+          value: store
+        - name: POSTGRES_USER
+          value: postgres
+        - name: POSTGRES_PASSWORD
+          value: root
+        ports:
+        - containerPort: 5432
+        volumeMounts:
+          - mountPath: "/var/lib/postgresql/data"
+            name: "postgres"
+        

assignment-4/backend-app/postgres-svc.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  ports:
+  - port: 5432
+  selector:
+    app: postgres
+  clusterIP: None

assignment-4/db/db.go

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+package db
+
+import (
+	"database/sql"
+	"time"
+
+	_ "github.com/jackc/pgconn"
+	_ "github.com/jackc/pgx/v4"
+	_ "github.com/jackc/pgx/v4/stdlib"
+)
+
+type DB struct {
+	SQL *sql.DB
+}
+
+var dbConn = &DB{}
+
+const maxOpenDbConn = 64
+const maxIdleDbConn = 64
+const maxDbLifeTime = 5 * time.Minute
+
+func ConnectDB(desc string) (*DB, error) {
+
+	db, err := NewDatabase(desc)
+
+	if err != nil {
+		panic(err)
+	}
+
+	db.SetMaxOpenConns(maxOpenDbConn)
+	db.SetMaxIdleConns(maxIdleDbConn)
+	db.SetConnMaxLifetime(maxDbLifeTime)
+
+	dbConn.SQL = db
+
+	return dbConn, nil
+}
+
+func NewDatabase(desc string) (*sql.DB, error) {
+	db, err := sql.Open("pgx", desc)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = db.Ping(); err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func GetDB() *sql.DB {
+	return dbConn.SQL
+}

assignment-4/docker-compose.yml

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+version: "3.8"
+
+services:
+  db:
+    image: postgres:alpine
+    container_name: "postgres"
+    ports:
+      - "5432:5432"
+    environment:
+      - POSTGRES_DB=store
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=root
+    networks:
+      - fullstack
+    volumes:
+      - database_postgres:/var/lib/postgresql/data
+      
+  web:
+    build: .
+    container_name: "backend-app"
+    command: ["go", "run", "main.go"]
+    ports:
+      - "8080:8080"
+    depends_on:
+      - db
+    networks:
+      - fullstack
+
+volumes:
+  database_postgres:
+
+networks:
+  fullstack:
+    driver: bridge

assignment-4/go.mod

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+module github.com/practice
+
+go 1.18
+
+require (
+	github.com/gorilla/mux v1.8.0 // indirect
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgconn v1.14.0 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.3.2 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgtype v1.14.0 // indirect
+	github.com/jackc/pgx/v4 v4.18.1 // indirect
+	golang.org/x/crypto v0.6.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+)