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main.go
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main.go
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package main
import (
"database/sql"
"html/template"
"log"
"net/http"
"strconv"
"github.com/gorilla/mux"
_ "github.com/mattn/go-sqlite3"
)
var tmpl *template.Template
var db *sql.DB
type Task struct {
ID int
Title string
Completed bool
OOB string
IsEditing bool
}
type Stats struct {
Count int
CompletedCount int
}
type Tasks struct {
Items []Task
Stats
}
// Gorilla Mux
// sqlite
// html template
// air: https://github.com/cosmtrek/air
func main() {
// Parse template
tmpl = template.Must(template.ParseFiles("index.html"))
// Setup database
var err error
db, err = sql.Open("sqlite3", "./todox.db")
if err != nil {
log.Fatal("open database failed", err)
}
defer db.Close()
// Initial data
initialDatabase()
// Routes setup
r := mux.NewRouter()
r.HandleFunc("/", Home).Methods("GET")
r.HandleFunc("/tasks", Add).Methods("POST")
r.HandleFunc("/tasks/{id}/toggle", Toggle).Methods("PUT")
r.HandleFunc("/tasks/{id}", Update).Methods("PUT")
r.HandleFunc("/tasks/{id}", Del).Methods("DELETE")
r.HandleFunc("/tasks/{id}", Edit).Methods("GET")
log.Println("Listen and serve at :3000")
log.Fatal(http.ListenAndServe(":3000", r))
}
func Home(w http.ResponseWriter, r *http.Request) {
ts, err := fetchTasks()
if err != nil {
log.Printf("fetch tasks error: %v", err)
w.Write([]byte("Sever internal error"))
}
st, err := statsTasks()
if err != nil {
w.Write([]byte("Sever internal error"))
}
ts.Stats = st
_ = tmpl.Execute(w, ts)
}
// Initial database
func initialDatabase() {
query := `
create table if not exists tasks (
id integer primary key autoincrement
, title string
, completed bool default false
);
`
_, err := db.Exec(query)
if err != nil {
log.Printf("creating table error: %v", err)
}
// Mockup data to tasks
cnt := 0
query = `select count(1) from tasks`
err = db.QueryRow(query).Scan(&cnt)
if err != nil {
log.Printf("can not count on table, error: %v", err)
}
if cnt == 0 {
query = `
insert into tasks (title) values ('Create tasks list');
insert into tasks (title) values ('Implement CRUD');
insert into tasks (title) values ('Support HTMX');
insert into tasks (title) values ('Add Bootstrap');
`
_, err := db.Exec(query)
if err != nil {
log.Printf("mockup data failed, error: %v", err)
}
}
}
// Get tasks list
func fetchTasks() (Tasks, error) {
var ts Tasks
query := `select id, title, completed from tasks`
rows, err := db.Query(query)
if err != nil {
return ts, err
}
defer rows.Close()
for rows.Next() {
var t Task
err := rows.Scan(&t.ID, &t.Title, &t.Completed)
if err != nil {
return ts, err
}
ts.Items = append(ts.Items, t)
}
return ts, nil
}
func statsTasks() (Stats, error) {
var st Stats
query := `select coalesce(count(1), 0) as num_of_tasks
, coalesce(sum(case when completed then 1 else 0 end), 0) as completed_tasks
from tasks
`
err := db.QueryRow(query).Scan(&st.Count, &st.CompletedCount)
if err != nil {
log.Printf("stats tasks error: %v", err)
return st, err
}
return st, nil
}
// Add task
func addTask(task Task) (Task, error) {
query := `insert into tasks (title) values (?) returning id`
t := task
err := db.QueryRow(query, t.Title).Scan(&t.ID)
if err != nil {
log.Printf("insert task error: %v", err)
return t, err
}
return t, nil
}
// Add task handler
func Add(w http.ResponseWriter, r *http.Request) {
title := r.FormValue("title")
if title == "" {
log.Printf("Title can not be nil")
return
}
t := Task{Title: title, Completed: false}
log.Printf("inserting task: %s", t.Title)
task, err := addTask(t)
if err != nil {
log.Printf("add task error: %v", err)
return
}
task.OOB = "beforeend:#tasks-list"
st, err := statsTasks()
if err != nil {
log.Printf("stats tasks error: %v", err)
return
}
_ = tmpl.ExecuteTemplate(w, "add-form-block", nil)
_ = tmpl.ExecuteTemplate(w, "tasks-stats-block", st)
_ = tmpl.ExecuteTemplate(w, "task-item-block", task)
}
// Update tasks
func updateTask(task Task) error {
query := `update tasks set title = ?, completed = ? where id = ?`
_, err := db.Exec(query, task.Title, task.Completed, task.ID)
log.Printf("updating: %d - %s - %t", task.ID, task.Title, task.Completed)
if err != nil {
log.Printf("updating task error: %v", err)
return err
}
return nil
}
func getTask(id int) (Task, error) {
query := `select id, title, completed from tasks where id = ?`
var task Task
err := db.QueryRow(query, id).Scan(&task.ID, &task.Title, &task.Completed)
if err != nil {
log.Printf("get task error: %v", err)
return task, err
}
return task, nil
}
func Toggle(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
taskId, err := strconv.Atoi(id)
if err != nil {
log.Printf("id not found: %v", err)
return
}
t, err := getTask(taskId)
if err != nil {
log.Printf("task not found: %v", err)
return
}
t.Completed = !t.Completed
err = updateTask(t)
if err != nil {
log.Printf("updating task error: %v", err)
return
}
t.OOB = "true"
ts, err := statsTasks()
if err != nil {
log.Printf("stats task error: %v", err)
return
}
_ = tmpl.ExecuteTemplate(w, "tasks-stats-block", ts)
_ = tmpl.ExecuteTemplate(w, "task-item-block", t)
}
// Delete task
func deleteTask(id int) error {
query := `delete from tasks where id = ?`
_, err := db.Exec(query, id)
if err != nil {
return err
}
return nil
}
func Del(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
taskId, err := strconv.Atoi(id)
if err != nil {
log.Printf("id not found: %v", err)
return
}
t, err := getTask(taskId)
if err != nil {
log.Printf("task not found: %v", err)
return
}
err = deleteTask(t.ID)
if err != nil {
log.Printf("delete task error: %v", err)
return
}
t.OOB = "delete"
ts, err := statsTasks()
if err != nil {
log.Printf("stats task error: %v", err)
return
}
_ = tmpl.ExecuteTemplate(w, "tasks-stats-block", ts)
_ = tmpl.ExecuteTemplate(w, "task-item-block", t)
}
func Edit(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
taskId, err := strconv.Atoi(id)
if err != nil {
log.Printf("id not found: %v", err)
return
}
t, err := getTask(taskId)
if err != nil {
log.Printf("task not found: %v", err)
return
}
t.IsEditing = true
t.OOB = "true"
_ = tmpl.ExecuteTemplate(w, "task-item-block", t)
}
func Update(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
taskId, err := strconv.Atoi(id)
if err != nil {
log.Printf("id not found: %v", err)
return
}
title := r.FormValue("title")
if title == "" {
log.Printf("title can not null")
return
}
t, err := getTask(taskId)
if err != nil {
log.Printf("task not found: %v", err)
return
}
t.Title = title
err = updateTask(t)
if err != nil {
log.Printf("updating task error: %v", err)
return
}
t.OOB = "true"
_ = tmpl.ExecuteTemplate(w, "task-item-block", t)
}