mirror of https://github.com/jackc/pgx.git
122 lines
2.8 KiB
Go
122 lines
2.8 KiB
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"os"
|
|
|
|
"github.com/jackc/pgx/v4"
|
|
"github.com/jackc/pgx/v4/log/log15adapter"
|
|
"github.com/jackc/pgx/v4/pgxpool"
|
|
log "gopkg.in/inconshreveable/log15.v2"
|
|
)
|
|
|
|
var db *pgxpool.Pool
|
|
|
|
// afterConnect creates the prepared statements that this application uses
|
|
func afterConnect(ctx context.Context, conn *pgx.Conn) (err error) {
|
|
_, err = conn.Prepare(ctx, "getUrl", `
|
|
select url from shortened_urls where id=$1
|
|
`)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
_, err = conn.Prepare(ctx, "deleteUrl", `
|
|
delete from shortened_urls where id=$1
|
|
`)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
_, err = conn.Prepare(ctx, "putUrl", `
|
|
insert into shortened_urls(id, url) values ($1, $2)
|
|
on conflict (id) do update set url=excluded.url
|
|
`)
|
|
return
|
|
}
|
|
|
|
func getUrlHandler(w http.ResponseWriter, req *http.Request) {
|
|
var url string
|
|
err := db.QueryRow(context.Background(), "getUrl", req.URL.Path).Scan(&url)
|
|
switch err {
|
|
case nil:
|
|
http.Redirect(w, req, url, http.StatusSeeOther)
|
|
case pgx.ErrNoRows:
|
|
http.NotFound(w, req)
|
|
default:
|
|
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
|
}
|
|
}
|
|
|
|
func putUrlHandler(w http.ResponseWriter, req *http.Request) {
|
|
id := req.URL.Path
|
|
var url string
|
|
if body, err := ioutil.ReadAll(req.Body); err == nil {
|
|
url = string(body)
|
|
} else {
|
|
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
if _, err := db.Exec(context.Background(), "putUrl", id, url); err == nil {
|
|
w.WriteHeader(http.StatusOK)
|
|
} else {
|
|
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
|
}
|
|
}
|
|
|
|
func deleteUrlHandler(w http.ResponseWriter, req *http.Request) {
|
|
if _, err := db.Exec(context.Background(), "deleteUrl", req.URL.Path); err == nil {
|
|
w.WriteHeader(http.StatusOK)
|
|
} else {
|
|
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
|
}
|
|
}
|
|
|
|
func urlHandler(w http.ResponseWriter, req *http.Request) {
|
|
switch req.Method {
|
|
case "GET":
|
|
getUrlHandler(w, req)
|
|
|
|
case "PUT":
|
|
putUrlHandler(w, req)
|
|
|
|
case "DELETE":
|
|
deleteUrlHandler(w, req)
|
|
|
|
default:
|
|
w.Header().Add("Allow", "GET, PUT, DELETE")
|
|
w.WriteHeader(http.StatusMethodNotAllowed)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
logger := log15adapter.NewLogger(log.New("module", "pgx"))
|
|
|
|
poolConfig, err := pgxpool.ParseConfig(os.Getenv("DATABASE_URL"))
|
|
if err != nil {
|
|
log.Crit("Unable to parse DATABASE_URL", "error", err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
poolConfig.AfterConnect = afterConnect
|
|
poolConfig.ConnConfig.Logger = logger
|
|
|
|
db, err = pgxpool.ConnectConfig(context.Background(), poolConfig)
|
|
if err != nil {
|
|
log.Crit("Unable to create connection pool", "error", err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
http.HandleFunc("/", urlHandler)
|
|
|
|
log.Info("Starting URL shortener on localhost:8080")
|
|
err = http.ListenAndServe("localhost:8080", nil)
|
|
if err != nil {
|
|
log.Crit("Unable to start web server", "error", err)
|
|
os.Exit(1)
|
|
}
|
|
}
|