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package main
import (
"log"
"net/http"
"database/sql"
"context"
"strings"
"time"
"strconv"
_ "github.com/mattn/go-sqlite3"
"stevenlr.com/timer/view"
"stevenlr.com/timer/model"
)
func insertTimer(tx *sql.Tx, name string, seconds int) error {
now := model.MakeTimeNow()
end := model.Time(time.Time(now).Add(time.Duration(seconds) * time.Second))
id := model.MakeUUID()
_, err := tx.Exec(`
INSERT INTO Timer VALUES ($1, $2, $3, $4)`, id, name, now, end);
return err
}
func initializeDatabase(db *sql.DB) error {
tx, err := db.Begin()
if err != nil { return err }
defer tx.Rollback()
_, err = tx.Exec(`PRAGMA user_version = 1`)
if err != nil { return err }
_, err = tx.Exec(`
CREATE TABLE Timer (
Id BLOB NOT NULL UNIQUE,
Name TEXT NOT NULL,
StartTime TEXT NOT NULL,
EndTime TEXT NOT NULL,
PRIMARY KEY (id)
)
`)
if err != nil { return err }
err = insertTimer(tx, "My timer", 600)
if err != nil { return err }
err = insertTimer(tx, "My timer2", 600)
if err != nil { return err }
return tx.Commit()
}
func queryAllTimers(db *sql.DB) []model.Timer {
rows, err := db.Query("SELECT Id, Name FROM Timer")
if err != nil { log.Fatalln(err) }
timers := []model.Timer{}
for rows.Next() {
var t model.Timer
if err := rows.Scan(&t.Id, &t.Name); err == nil {
timers = append(timers, t)
}
}
return timers
}
func queryTimer(db *sql.DB, idStr string) *model.Timer {
var id model.UUID
if err := id.Scan(idStr); err != nil { return nil }
row := db.QueryRow("SELECT Id, Name, StartTime, EndTime FROM Timer WHERE Id=$1", id)
var t model.Timer
if err := row.Scan(&t.Id, &t.Name, &t.StartTime, &t.EndTime); err == nil {
return &t
}
return nil
}
func deleteTimer(db *sql.DB, idStr string) bool {
var id model.UUID
if err := id.Scan(idStr); err != nil { return false }
res, err := db.Exec("DELETE FROM Timer WHERE Id=$1", id)
if err != nil { return false }
affected, err := res.RowsAffected()
return err == nil && affected > 0
}
type MyServer struct {
db *sql.DB
}
func (server *MyServer) handleNotFound(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusNotFound)
view.Main(view.Error404()).Render(context.Background(), w)
}
func (server *MyServer) handleMain(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
timers := queryAllTimers(server.db)
view.Main(view.TimersList(timers)).Render(context.Background(), w)
} else {
server.handleNotFound(w, r)
}
}
func (server *MyServer) handleTimer(w http.ResponseWriter, r *http.Request) {
timer := queryTimer(server.db, r.PathValue("timerId"))
if timer != nil {
view.Main(view.TimerView(*timer)).Render(context.Background(), w)
} else {
server.handleNotFound(w, r)
}
}
func (server *MyServer) handleDeleteTimer(w http.ResponseWriter, r *http.Request) {
success := deleteTimer(server.db, r.PathValue("timerId"))
if !success {
w.WriteHeader(http.StatusNotFound)
}
}
func (server* MyServer) handlePutTimer(w http.ResponseWriter, r *http.Request) {
timerName := strings.TrimSpace(r.FormValue("timerName"))
days, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("days")), 10, 32)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
view.TimerCreateForm(timerName, "Error parsing days").Render(context.Background(), w)
return
}
hours, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("hours")), 10, 32)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
view.TimerCreateForm(timerName, "Error parsing hours").Render(context.Background(), w)
return
}
tx, err := server.db.Begin()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
view.TimerCreateForm(timerName, "Internal server error").Render(context.Background(), w)
return
}
defer tx.Rollback()
if timerName == "" {
w.WriteHeader(http.StatusBadRequest)
view.TimerCreateForm("", "Timer name cannot be empty").Render(context.Background(), w)
return
}
err = insertTimer(tx, timerName, int(((max(days, 0) * 24) + max(hours, 0)) * 3600))
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
view.TimerCreateForm(timerName, "Internal server error").Render(context.Background(), w)
return
}
tx.Commit()
timers := queryAllTimers(server.db)
view.TimersList(timers).Render(context.Background(), w)
}
func main() {
log.Println("Starting...")
db, err := sql.Open("sqlite3", ":memory:")
if err != nil {
log.Fatalln(err)
}
defer db.Close()
if err := initializeDatabase(db); err != nil {
log.Fatalln(err)
}
myServer := MyServer{ db: db }
fs := http.FileServer(http.Dir("static/"))
http.Handle("GET /static/", http.StripPrefix("/static/", fs))
http.HandleFunc("GET /timer/{timerId}", myServer.handleTimer)
http.HandleFunc("DELETE /timer/{timerId}", myServer.handleDeleteTimer)
http.HandleFunc("PUT /timer", myServer.handlePutTimer)
http.HandleFunc("GET /", myServer.handleMain)
log.Println("Started!")
http.ListenAndServe("0.0.0.0:80", nil)
}
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