plugins/quotes.go (view raw)
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package plugins import ( "bytes" "errors" "fmt" "log" "math/rand" "strconv" "strings" "git.icyphox.sh/paprika/database" "github.com/dgraph-io/badger/v3" "gopkg.in/irc.v3" ) type Quotes struct{} func init() { Register(Quotes{}) } func (Quotes) Triggers() []string { return []string{".q", ".quote"} } func result(quoteNum int, total int, nick string, quote string) string { return fmt.Sprintf("[%d/%d] <%s> %s", quoteNum, total, nick, quote) } var found = errors.New("Found") var KeyEncodingError = errors.New("Unexpected key encoding") var TooManyQuotes = errors.New("Too many quotes") func getQuoteTotal(txn *badger.Txn, keyPrefix []byte) (int, error) { item, err := txn.Get([]byte(keyPrefix)) if err != nil { return 0, err } it, err := item.ValueCopy(nil) if err != nil { return 0, err } res, err := strconv.Atoi(string(it)) if _, ok := err.(*strconv.NumError); ok { log.Printf("quotes.go: Warning: Something is wrong with the value in key: %s", keyPrefix) return 0, nil // return 0 in hopes of it being overwritten } else if err != nil { return 0, err } return res, nil } func getAndIncrementQuoteTotal(txn *badger.Txn, keyPrefix []byte) (int, error) { total, err := getQuoteTotal(txn, keyPrefix) if err == badger.ErrKeyNotFound { total = 0 } else if err != nil { return 0, err } total++ return total, txn.Set(keyPrefix, []byte(strconv.Itoa(total))) } func findQuotes(nick string, keyPrefix, search []byte) (string, error) { var ( num int total int quote string ) err := database.DB.DB.View(func(txn *badger.Txn) error { iter := txn.NewIterator(badger.DefaultIteratorOptions) defer iter.Close() var err error prefix := append(keyPrefix, ' ') for iter.Seek(prefix); iter.ValidForPrefix(prefix); iter.Next() { item := iter.Item() key := item.Key() err = item.Value(func(val []byte) error { if bytes.Contains(val, search) { quote = string(val) keys := bytes.SplitN(key, []byte{' '}, 3) if len(keys) != 3 { log.Printf("quotes.go: Key Error: %s is not in expected format", key) return KeyEncodingError } num, err = database.DecodeNumber(keys[2]) if err != nil { return err } else { return found } } else { return nil } }) if err != nil { break } } if err == found { total, err = getQuoteTotal(txn, []byte(keyPrefix)) if err != nil { return err } else { return found } } else { return err } }) if err == nil { return "No quote found.", nil } else if err == found { return result(num, total, nick, quote), nil } else { return "", err } } func addQuote(keyPrefix, quote []byte) (string, error) { var id int err := database.DB.DB.Update(func(txn *badger.Txn) error { var err error id, err = getAndIncrementQuoteTotal(txn, keyPrefix) if err != nil { return err } else if id > 5_000 { return TooManyQuotes } encodedId, err := database.EncodeNumber(id) if err != nil { return err } key := append(keyPrefix, ' ') key = append(key, encodedId...) err = txn.Set(key, quote) if err != nil { return err } return nil }) if err == nil { return fmt.Sprintf("Quote %d added.", id), err } else { return "", err } } func getQuote(nick string, qnum int, keyPrefix []byte) (string, error) { var ( num int total int quote string negative bool ) if qnum < 0 { qnum += 1 negative = true } else { negative = false } err := database.DB.DB.View(func(txn *badger.Txn) error { var err error total, err = getQuoteTotal(txn, keyPrefix) if err != nil { return err } num = qnum if negative { num = total + qnum if num < 1 { return badger.ErrKeyNotFound } } else if num > total { return badger.ErrKeyNotFound } else if num == randomQuote { // [1, total+1) num = rand.Intn(total) + 1 } encodeQnum, err := database.EncodeNumber(num) if err != nil { return err } encodedKey := append(keyPrefix, ' ') encodedKey = append(encodedKey, encodeQnum...) qItem, err := txn.Get(encodedKey) if err != nil { return err } quoteT, err := qItem.ValueCopy(nil) if err != nil { return err } quote = string(quoteT) return nil }) if err == badger.ErrKeyNotFound { return "No such quote for " + nick, nil } else if err != nil { return "", err } else { return result(num, total, nick, quote), nil } } const randomQuote = 0 const ( addQ int = iota getQ start parseNick parseGetParam ) func (Quotes) Execute(m *irc.Message) (string, error) { params := strings.Split(m.Trailing(), " ") if len(params) == 1 { return ".q [ add ] nickname [ quote | search | number ]", nil } pState := start cState := getQ var nick string keyPrefix := []byte(m.Params[0] + " ") for i := 1; i < len(params); i++ { word := params[i] back: if len(word) == 0 { continue } switch pState { case start: pState = parseNick if word == "add" { cState = addQ } else { goto back } case parseNick: if word == "<" || len(word) == 0 { break } // <xyz> -> xyz word = strings.TrimPrefix(word, "<") word = strings.TrimSuffix(word, ">") if len(word) == 0 { return "Invalid nickname given", nil } // This is used elsewhere to check the prefix of a "target" // if it's true, then this word still has a prefix we can // remove. if likelyInvalidNickChr(word[0]) { word = word[1:] } if len(word) == 0 { return "Invalid nickname given", nil } // we only allow "< " prefix, not "<" + 2*sym for j := 0; j < len(word); j++ { if likelyInvalidNickChr(word[j]) { return fmt.Sprintf("Invalid nickname: %s", word), nil } } nick = word keyPrefix = append(keyPrefix, nick...) if cState == addQ { quote := strings.Join(params[i+1:], " ") if len(quote) == 0 { return "Empty quote not allowed.", nil } return addQuote(keyPrefix, []byte(quote)) } else { pState = parseGetParam } case parseGetParam: if i+1 == len(params) { qnum, err := strconv.Atoi(word) if err != nil { return findQuotes(nick, keyPrefix, []byte(word)) } else { return getQuote(nick, qnum, keyPrefix) } } else { quote := strings.Join(params[i+1:], " ") return findQuotes(nick, keyPrefix, []byte(quote)) } } } // If no number given, use 0 to indicate random quote. if pState == parseGetParam { return getQuote(nick, randomQuote, keyPrefix) } else { return "Invalid number of parameters.", nil } } |