89 lines
1.6 KiB
Go
89 lines
1.6 KiB
Go
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"database/sql"
|
||
|
|
"encoding/json"
|
||
|
|
"fmt"
|
||
|
|
"io/ioutil"
|
||
|
|
"log"
|
||
|
|
"net/http"
|
||
|
|
"os"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/gorilla/handlers"
|
||
|
|
"github.com/gorilla/mux"
|
||
|
|
_ "github.com/lib/pq"
|
||
|
|
)
|
||
|
|
|
||
|
|
func connect() (*sql.DB, error) {
|
||
|
|
bin, err := ioutil.ReadFile("/run/secrets/db-password")
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return sql.Open("postgres", fmt.Sprintf("postgres://postgres:%s@db:5432/example?sslmode=disable", string(bin)))
|
||
|
|
}
|
||
|
|
|
||
|
|
func blogHandler(w http.ResponseWriter, r *http.Request) {
|
||
|
|
db, err := connect()
|
||
|
|
if err != nil {
|
||
|
|
w.WriteHeader(500)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
defer db.Close()
|
||
|
|
|
||
|
|
rows, err := db.Query("SELECT title FROM blog")
|
||
|
|
if err != nil {
|
||
|
|
w.WriteHeader(500)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
var titles []string
|
||
|
|
for rows.Next() {
|
||
|
|
var title string
|
||
|
|
err = rows.Scan(&title)
|
||
|
|
titles = append(titles, title)
|
||
|
|
}
|
||
|
|
json.NewEncoder(w).Encode(titles)
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
log.Print("Prepare db...")
|
||
|
|
if err := prepare(); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
log.Print("Listening 8000")
|
||
|
|
r := mux.NewRouter()
|
||
|
|
r.HandleFunc("/", blogHandler)
|
||
|
|
log.Fatal(http.ListenAndServe(":8000", handlers.LoggingHandler(os.Stdout, r)))
|
||
|
|
}
|
||
|
|
|
||
|
|
func prepare() error {
|
||
|
|
db, err := connect()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
defer db.Close()
|
||
|
|
|
||
|
|
for i := 0; i < 60; i++ {
|
||
|
|
if err := db.Ping(); err == nil {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
time.Sleep(time.Second)
|
||
|
|
}
|
||
|
|
|
||
|
|
if _, err := db.Exec("DROP TABLE IF EXISTS blog"); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
if _, err := db.Exec("CREATE TABLE IF NOT EXISTS blog (id SERIAL, title VARCHAR)"); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
for i := 0; i < 5; i++ {
|
||
|
|
if _, err := db.Exec("INSERT INTO blog (title) VALUES ($1);", fmt.Sprintf("Blog post #%d", i)); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|