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main関数からハンドラーを切り出し #49

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312 changes: 135 additions & 177 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,18 +12,18 @@ TODO
import (
"database/sql"
"encoding/json"
"fmt"
"net"
"net/http"
"os"
"strconv"

_ "github.com/mattn/go-sqlite3"
_ "modernc.org/sqlite"
)

var db *sql.DB

func main() {

db, err := sql.Open("sqlite3", "database.db")
db, err := sql.Open("sqlite", "database.db")
if err != nil {
panic(err)
}
Expand All @@ -32,207 +32,165 @@ func main() {
panic(err)
}

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
resp, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/available_lotteries")
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp.Body.Close()
http.HandleFunc("/", route)
http.HandleFunc("/purchase_page", purchasePage)
http.HandleFunc("/result", result)

var lotteries []*Lottery
if err := json.NewDecoder(resp.Body).Decode(&lotteries); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

if err := listTmpl.Execute(w, lotteries); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
})

http.HandleFunc("/purchase_page", func(w http.ResponseWriter, r *http.Request) {
resp, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/lottery?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp.Body.Close()

var l Lottery
if err := json.NewDecoder(resp.Body).Decode(&l); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
addr := net.JoinHostPort("", port)
http.ListenAndServe(addr, nil)
}

data := struct {
Lottery
Remain int64
}{
Lottery: l,
Remain: l.Num, // TODO: 残りを計算する
}
if err := purchasePageTmpl.Execute(w, data); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
})
func initDB(db *sql.DB) error {
const sql = `
CREATE TABLE IF NOT EXISTS purchased (
lottery_id TEXT NOT NULL,
number TEXT NOT NULL,
PRIMARY KEY(lottery_id, number)
);
`
if _, err := db.Exec(sql); err != nil {
return err
}
return nil
}

http.HandleFunc("/purchase", func(w http.ResponseWriter, r *http.Request) {
id := r.FormValue("id")
num, err := strconv.Atoi(r.FormValue("num"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
// TODO: パラメタのバリデーション
func route(w http.ResponseWriter, r *http.Request) {
resp, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/available_lotteries")
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp.Body.Close()

resp, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/lottery?id=" + id)
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp.Body.Close()
var lotteries []*Lottery
if err := json.NewDecoder(resp.Body).Decode(&lotteries); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

var l Lottery
if err := json.NewDecoder(resp.Body).Decode(&l); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
if err := listTmpl.Execute(w, lotteries); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
}

var count int
if err := db.QueryRow("SELECT COUNT(*) FROM purchased WHERE lottery_id = ?", l.ID).Scan(&count); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
func purchasePage(w http.ResponseWriter, r *http.Request) {
resp, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/lottery?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp.Body.Close()

for i := 1; i <= num; i++ {
const sql = "INSERT INTO purchased(lottery_id, number) values (?,?)"
format := fmt.Sprintf(`%%0%dd`, len(strconv.FormatInt(l.Num-1, 10)))
n := fmt.Sprintf(format, count+i)
if _, err := db.Exec(sql, id, n); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
}
var l Lottery
if err := json.NewDecoder(resp.Body).Decode(&l); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

http.Redirect(w, r, "/purchase_page?id="+l.ID, http.StatusFound)
})
data := struct {
Lottery
Remain int64
}{
Lottery: l,
Remain: l.Num, // TODO: 残りを計算する
}
if err := purchasePageTmpl.Execute(w, data); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
}

http.HandleFunc("/result", func(w http.ResponseWriter, r *http.Request) {
resp1, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/result?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp1.Body.Close()
func result(w http.ResponseWriter, r *http.Request) {
resp1, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/result?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp1.Body.Close()

var result Result
if err := json.NewDecoder(resp1.Body).Decode(&result); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
var result Result
if err := json.NewDecoder(resp1.Body).Decode(&result); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

resp2, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/lottery?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp2.Body.Close()
resp2, err := http.Get("https://lottery-dot-tenntenn-samples.appspot.com/lottery?id=" + r.FormValue("id"))
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
defer resp2.Body.Close()

var l Lottery
if err := json.NewDecoder(resp2.Body).Decode(&l); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
var l Lottery
if err := json.NewDecoder(resp2.Body).Decode(&l); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

type winner struct {
Prize *Prize
Numbers []string
}
type winner struct {
Prize *Prize
Numbers []string
}

data := struct {
Lottery
Winners map[string]*winner
}{
Lottery: l,
Winners: map[string]*winner{},
}
data := struct {
Lottery
Winners map[string]*winner
}{
Lottery: l,
Winners: map[string]*winner{},
}

rows, err := db.Query("SELECT number FROM purchased WHERE lottery_id = ?", l.ID)
if err != nil {
rows, err := db.Query("SELECT number FROM purchased WHERE lottery_id = ?", l.ID)
if err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
for rows.Next() {
var number string
if err := rows.Scan(&number); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
for rows.Next() {
var number string
if err := rows.Scan(&number); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}

for i := range result.Winners {
for _, n := range result.Winners[i].Numbers {
if number == n {
prizeID := result.Winners[i].PrizeID
if data.Winners[prizeID] == nil {
for _, p := range l.Prizes {
if p.ID == prizeID {
data.Winners[prizeID] = &winner{
Prize: p,
}
for i := range result.Winners {
for _, n := range result.Winners[i].Numbers {
if number == n {
prizeID := result.Winners[i].PrizeID
if data.Winners[prizeID] == nil {
for _, p := range l.Prizes {
if p.ID == prizeID {
data.Winners[prizeID] = &winner{
Prize: p,
}
}
}
data.Winners[prizeID].Numbers = append(data.Winners[prizeID].Numbers, n)
}
data.Winners[prizeID].Numbers = append(data.Winners[prizeID].Numbers, n)
}
}
}

if err := resultTmpl.Execute(w, data); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
})

port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
addr := net.JoinHostPort("", port)
http.ListenAndServe(addr, nil)
}

func initDB(db *sql.DB) error {
const sql = `
CREATE TABLE IF NOT EXISTS purchased (
lottery_id TEXT NOT NULL,
number TEXT NOT NULL,
PRIMARY KEY(lottery_id, number)
);
`
if _, err := db.Exec(sql); err != nil {
return err
if err := resultTmpl.Execute(w, data); err != nil {
const status = http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
return
}
return nil
}