mastodon-group-bot/limits.go

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package main
import (
"database/sql"
"fmt"
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"time"
_ "github.com/mattn/go-sqlite3"
)
// Init database
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func init_limit_db() *sql.DB {
db, err := sql.Open("sqlite3", *DBPath)
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if err != nil {
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ErrorLogger.Println("Open database")
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}
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cmd1 := `CREATE TABLE IF NOT EXISTS Limits (id INTEGER PRIMARY KEY AUTOINCREMENT, acct TEXT, ticket INTEGER, time TEXT)`
cmd2 := `CREATE TABLE IF NOT EXISTS MsgHashs (message_hash TEXT)`
stat1, err := db.Prepare(cmd1)
if err != nil {
ErrorLogger.Println("Create database")
}
stat1.Exec()
stat2, err := db.Prepare(cmd2)
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if err != nil {
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ErrorLogger.Println("Create database")
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}
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stat2.Exec()
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return db
}
// Add account to database
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func add_to_db(acct string) {
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db := init_limit_db()
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cmd := `INSERT INTO Limits (acct, ticket) VALUES (?, ?)`
stat, err := db.Prepare(cmd)
if err != nil {
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ErrorLogger.Println("Add account to databse")
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}
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stat.Exec(acct, Conf.Max_toots)
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}
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// Save message hash
func save_msg_hash(hash string) {
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db := init_limit_db()
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cmd1 := `SELECT COUNT(*) FROM MsgHashs`
cmd2 := `DELETE FROM MsgHashs WHERE ROWID IN (SELECT ROWID FROM MsgHashs LIMIT 1)`
cmd3 := `INSERT INTO MsgHashs (message_hash) VALUES (?)`
var rows int
db.QueryRow(cmd1).Scan(&rows)
if rows >= Conf.Duplicate_buf {
superfluous := rows - Conf.Duplicate_buf
for i := 0; i <= superfluous; i++ {
stat2, err := db.Prepare(cmd2)
if err != nil {
ErrorLogger.Println("Delete message hash from database")
}
stat2.Exec()
}
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}
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stat1, err := db.Prepare(cmd3)
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if err != nil {
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ErrorLogger.Println("Add message hash to database")
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}
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stat1.Exec(hash)
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}
// Check followed once
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func followed(acct string) bool {
db := init_limit_db()
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cmd := `SELECT acct FROM Limits WHERE acct = ?`
err := db.QueryRow(cmd, acct).Scan(&acct)
if err != nil {
if err != sql.ErrNoRows {
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InfoLogger.Println("Check followed")
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}
return false
}
return true
}
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// Check message hash
func check_msg_hash(hash string) bool {
db := init_limit_db()
cmd := `SELECT message_hash FROM MsgHashs WHERE message_hash = ?`
err := db.QueryRow(cmd, hash).Scan(&hash)
if err != nil {
if err != sql.ErrNoRows {
InfoLogger.Println("Check message hash in database")
}
return false
}
return true
}
// Take ticket for tooting
func take_ticket(acct string) {
db := init_limit_db()
cmd1 := `SELECT ticket FROM Limits WHERE acct = ?`
cmd2 := `UPDATE Limits SET ticket = ?, time = ? WHERE acct = ?`
var ticket uint16
db.QueryRow(cmd1, acct).Scan(&ticket)
if ticket > 0 {
ticket = ticket - 1
}
stat, err := db.Prepare(cmd2)
if err != nil {
ErrorLogger.Println("Take ticket")
}
now := time.Now()
last_toot_at := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second(), 0, time.Local).Format("2006/01/02 15:04:05 MST")
stat.Exec(ticket, last_toot_at, acct)
}
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// Check ticket availability
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func check_ticket(acct string) uint16 {
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db := init_limit_db()
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cmd1 := `SELECT ticket FROM Limits WHERE acct = ?`
cmd2 := `SELECT time FROM Limits WHERE acct = ?`
var tickets uint16
var lastS string
db.QueryRow(cmd1, acct).Scan(&tickets)
db.QueryRow(cmd2, acct).Scan(&lastS)
lastT, _ := time.Parse("2006/01/02 15:04:05 MST", lastS)
since := time.Since(lastT)
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limit := fmt.Sprintf("%dh", Conf.Toots_interval)
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interval, _ := time.ParseDuration(limit)
if since >= interval {
cmd := `UPDATE Limits SET ticket = ? WHERE acct = ?`
stat, err := db.Prepare(cmd)
if err != nil {
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ErrorLogger.Println("Check ticket availability")
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}
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stat.Exec(Conf.Max_toots, acct)
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return Conf.Max_toots
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}
return tickets
}