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store.go
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store.go
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package xkcdstore
import (
"database/sql"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"strings"
"sync"
_ "github.com/mattn/go-sqlite3"
)
var (
recentURL string = "https://xkcd.com/info.0.json"
entryURL string = "https://xkcd.com/%d/info.0.json"
)
type XkcdComic struct {
Num int `json:"num"`
Title string `json:"title"`
Image string `json:"img"`
Alt string `json:"alt"`
Transcript string `json:"transcript"`
// Month string `json:"month"`
// Day string `json:"day"`
// Year string `json:"year"`
// Link string `json:"link"`
// News string `json:"news"`
// SafeTitle string `json:"json_title"`
}
type XkcdStore struct {
db *sql.DB
mut sync.RWMutex
Entries []XkcdComic
}
func New(fileName string) (*XkcdStore, error) {
entries := []XkcdComic{}
db, err := sql.Open("sqlite3", fileName)
if err != nil {
return nil, err
}
store := &XkcdStore{
db: db,
Entries: entries,
}
if err := store.init(); err != nil {
return nil, err
}
return store, nil
}
func (s *XkcdStore) init() error {
query := `
CREATE TABLE IF NOT EXISTS xkcd (
num INTEGER UNIQUE,
title TEXT,
img TEXT,
alt TEXT,
transcript TEXT
);`
_, err := s.db.Exec(query)
if err != nil {
log.Printf("Database init: %s\n", err)
}
return nil
}
func (s *XkcdStore) Close() error {
return s.db.Close()
}
func (s *XkcdStore) Fetch(ID int) (*XkcdComic, error) {
var (
entry = &XkcdComic{}
client = http.Client{}
url string
)
if ID <= 0 {
url = recentURL
} else {
url = fmt.Sprintf(entryURL, ID)
}
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
data, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if err := json.Unmarshal(data, &entry); err != nil {
return nil, err
}
return entry, nil
}
func (s *XkcdStore) Insert(entry *XkcdComic) error {
s.mut.Lock()
defer s.mut.Unlock()
query := `
INSERT INTO xkcd(num, title, img, alt, transcript)
VALUES (?, ?, ?, ?, ?);`
_, err := s.db.Exec(query, entry.Num, entry.Title, entry.Image, entry.Alt, entry.Transcript)
if err != nil {
return err
}
return nil
}
func (s *XkcdStore) Current() (int, error) {
var out int = 1
query := `SELECT COUNT(num) FROM xkcd LIMIT 1;`
res, err := s.db.Query(query)
if err != nil {
return out, err
}
defer res.Close()
for res.Next() {
if err := res.Scan(&out); err != nil {
return out, err
}
break
}
return out, nil
}
func (s *XkcdStore) Search(term string) (*[]XkcdComic, error) {
var entries []XkcdComic
query := `
SELECT *
FROM xkcd
WHERE title LIKE "%?%"
OR img LIKE "%?%"
OR alt LIKE "%?%"
or transcript LIKE "%?%"
ORDER BY num ASC;`
query = strings.ReplaceAll(query, "?", term)
if term == "-" {
query = `SELECT * FROM xkcd ORDER BY num ASC;`
}
res, err := s.db.Query(query)
if err != nil {
return nil, err
}
defer res.Close()
for res.Next() {
var entry XkcdComic
err := res.Scan(&entry.Num,
&entry.Title,
&entry.Image,
&entry.Alt,
&entry.Transcript)
if err != nil {
return nil, err
}
entries = append(entries, entry)
}
return &entries, nil
}