Merge pull request 'dokcer file, docker compose, psql, api, json' (#1) from feature/dockerize-api-psql into master

Reviewed-on: shah/POC-golang-postgres-docker#1

.gitignore

@@ -22,7 +22,8 @@
 .LSOverride
 
 # Icon must end with two \r
-Icon
+Icon
+
 
 # Thumbnails
 ._*
@@ -57,4 +58,5 @@ Temporary Items
 
 # .nfs files are created when an open file is removed but is still being accessed
 .nfs*
+go.sum
 

Dockerfile

@@ -0,0 +1,8 @@
+FROM golang:alpine as builder
+
+RUN mkdir -p /go/src/app
+WORKDIR /go/src/app
+
+ADD . /go/src/app
+
+RUN go get -d -v

README.md

@@ -1,3 +1,15 @@
-# golang-postgres-docker
 
-Just basic golang and postgres docker poc.
+
+Just basic golang and postgres docker poc.
+
+To build docker compose
+`docker-compose up --build`
+
+To run docker compose
+`docker-compose up -d`
+
+
+To connect with psql using following command
+`docker exec -it  genity-code-review_db_1 psql -U root_user -W db_genity`
+
+

api.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+type User struct {
+	UserID     int
+	Title      string
+	CreatedOn time.Time
+}
+
+type Users struct {
+	users []User
+}
+
+func UserHandler(w http.ResponseWriter, req *http.Request) {
+	users := Users{}
+
+	err := queryRepos(&users)
+	if err != nil {
+		http.Error(w, err.Error(), 500)
+		return
+	}
+
+
+	out, err := json.Marshal(users.users)
+	if err != nil {
+		http.Error(w, err.Error(), 500)
+		return
+	}
+
+	fmt.Fprintf(w, string(out))
+}
+
+func queryRepos(users *Users) error {
+	rows, err := db.Query(`
+		SELECT
+     		user_id,
+			title,
+			created_on
+			
+		FROM users;
+		`)
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+	for rows.Next() {
+		user := User{}
+		err = rows.Scan(
+			&user.UserID,
+			&user.Title,
+			&user.CreatedOn,
+		)
+		if err != nil {
+			return err
+		}
+		users.users = append(users.users, user)
+	}
+
+	err = rows.Err()
+	if err != nil {
+		return err
+	}
+	return nil
+}

db_dump

@@ -0,0 +1,4 @@
+CREATE TABLE users (	user_id serial PRIMARY KEY, title VARCHAR ( 50 ) UNIQUE NOT NULL, created_on TIMESTAMP NOT NULL);
+INSERT INTO users (title,created_on) VALUES('hemani','2013-06-01');
+
+

docker-compose.yml

@@ -0,0 +1,30 @@
+version: '3'
+services:
+  db:
+    image: postgres
+    environment:
+      POSTGRES_DB: db_genity
+      POSTGRES_USER: root_user
+      POSTGRES_PASSWORD: shahzad12
+    volumes:
+      - db_postgres:/var/lib/postgresql/data
+    ports:
+      - "5436:5432"
+    networks:
+      - genity_network
+  app:
+    build: ""
+    command: [ "go", "run", "main.go","api.go"]
+    ports:
+      - "8080:8080"
+    depends_on:
+      - db
+    links:
+      - db
+    networks:
+      - genity_network
+volumes:
+  db_postgres:
+networks:
+  genity_network:
+    driver: bridge

go.mod

@@ -0,0 +1,7 @@
+module genity-code-review
+
+go 1.14
+
+require (
+	github.com/lib/pq v1.8.0
+)

main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	_ "github.com/lib/pq"
+	"log"
+	"net/http"
+)
+
+var db *sql.DB
+
+const (
+	dbhost = "DBHOST"
+	dbport = "DBPORT"
+	dbuser = "DBUSER"
+	dbpass = "DBPASS"
+	dbname = "DBNAME"
+)
+
+func main() {
+	initDb()
+	defer db.Close()
+
+	http.HandleFunc("/api/users", UserHandler)
+
+	fmt.Println("Listening on :8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+
+}
+
+
+func initDb() {
+	config := dbConfig()
+	var err error
+	psqlInfo := fmt.Sprintf("postgres://%v:%v@%v:%v/%v?sslmode=disable",
+		config[dbuser], config[dbpass],
+		config[dbhost], config[dbport], config[dbname])
+
+	fmt.Println(psqlInfo)
+	db, err = sql.Open("postgres", psqlInfo)
+	if err != nil {
+		panic(err)
+	}
+	err = db.Ping()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Successfully connected!")
+
+
+
+
+
+}
+
+func dbConfig() map[string]string {
+	conf := make(map[string]string)
+	conf[dbhost] = "genity-code-review_db_1"
+	conf[dbport] = "5432"
+	conf[dbuser] = "root_user"
+	conf[dbpass] = "shahzad12"
+	conf[dbname] = "db_genity"
+	return conf
+}