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package main
import (
"database/sql"
"errors"
"log"
"os"
_ "github.com/mattn/go-sqlite3"
)
func initDB(path string) *sql.DB {
if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
log.Printf("Creating %s...\n", path)
file, err := os.Create(path)
if err != nil {
log.Fatal(err)
}
file.Close()
db, _ := sql.Open("sqlite3", path)
initTables(db)
return db
} else {
db, err := sql.Open("sqlite3", path)
if err != nil {
log.Fatal(err)
}
return db
}
}
func initTables(db *sql.DB) {
q := `
CREATE TABLE IF NOT EXISTS users (
id integer NOT NULL PRIMARY KEY,
user_id VARCHAR(18)
);
CREATE UNIQUE INDEX idx_users_user_id ON users(user_id);
CREATE TABLE IF NOT EXISTS guilds (
id integer NOT NULL PRIMARY KEY,
guild_id VARCHAR(18)
);
CREATE UNIQUE INDEX idx_guilds_guild_id ON guilds(guild_id);
CREATE TABLE IF NOT EXISTS channels (
id integer NOT NULL PRIMARY KEY,
channel_id VARCHAR(18)
);
CREATE UNIQUE INDEX idx_channels_channel_id ON channels(channel_id);
CREATE TABLE IF NOT EXISTS urls (
id integer NOT NULL PRIMARY KEY,
url VARCHAR(500) NOT NULL,
user_string_id INTEGER NOT NULL,
guild_string_id INTEGER NOT NULL,
channel_string_id INTEGER NOT NULL,
status_code INTEGER NOT NULL,
FOREIGN KEY(user_string_id) REFERENCES users(id),
FOREIGN KEY(guild_string_id) REFERENCES guilds(id),
FOREIGN KEY(channel_string_id) REFERENCES channels(id)
);
CREATE UNIQUE INDEX idx_urls_url ON urls(url);`
_, err := db.Exec(q)
if err != nil {
log.Fatal(err)
}
}
func addArchived(db *sql.DB, m *Message, status_code int) {
// Start a transaction using default isolation
tx, err := db.Begin()
if err != nil {
log.Fatal(err)
}
defer tx.Rollback()
// Insert new entries in users, guilds, channels tables for new values,
// ignoring if already present
_, err = tx.Exec(`
INSERT OR IGNORE INTO users(user_id) VALUES(?);
INSERT OR IGNORE INTO guilds(guild_id) VALUES(?);
INSERT OR IGNORE INTO channels(channel_id) VALUES(?);`,
m.Author, m.Guild, m.Channel)
if err != nil {
log.Fatal(err)
}
// Insert entry in URLs table using foreign key reference IDs
_, err = tx.Exec(`
INSERT OR IGNORE INTO
urls(url, user_string_id, guild_string_id, channel_string_id, status_code)
VALUES(
?,
(SELECT id FROM users WHERE user_id = ?),
(SELECT id FROM guilds WHERE guild_id = ?),
(SELECT id FROM channels WHERE channel_id = ?),
?
);`, m.URL, m.Author, m.Guild, m.Channel, status_code)
if err != nil {
log.Fatal(err)
}
// Finally commit the transaction
if err := tx.Commit(); err != nil {
log.Fatal(err)
}
}
func isCached(db *sql.DB, url string) (bool, int) {
var status_code int
err := db.QueryRow("SELECT status_code FROM urls WHERE url = ?",
url).Scan(&status_code)
switch {
case err == sql.ErrNoRows:
return false, status_code
case err != nil:
log.Fatal(err)
}
return true, status_code
}
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