CODEWITHSUNDEEP
javadiscord-jda
SorenNeedsCoffee
SorenNeedsCoffee

Reputation: 75

What's the best way to handle not being able to send a private message to a user?

I'm working on a discord bot that uses private messages to inform a user if they've been warned by a moderator. While working on this, I discovered that there is an edge case where a bot can't send a message to a user because of their privacy settings. How can I write my code to open a private channel, attempt sending a message, and handle not being able to send it?

Here is the code that sends the message:

public static void sendNotification(Warning warning, TextChannel alt) {
    User target = jda.getUserById(warning.getuId());
    if(target == null)
        return;
    target.openPrivateChannel().queue(c -> c.sendMessage(WarningUtil.generateWarningMessage(warning)).queue());
}

Upvotes: 2

Views: 1105

Answers (1)

Minn
Minn

Reputation: 6134

You can use a combination of flatMap and onErrorFlatMap:

public RestAction<Message> sendMessage(User user, TextChannel context, String content) {
    return user.openPrivateChannel() // RestAction<PrivateChannel>
        .flatMap((channel) -> channel.sendMessage(content)) // RestAction<Message>
        .onErrorFlatMap(CANNOT_SEND_TO_USER::test,
            (error) -> context.sendMessage("Cannot send direct message to " + user.getAsMention())
        ); // RestAction<Message> (must be the same as above)
}

Alternatively, you can also use ErrorHandler

public static void sendMessage(User user, String content) {
    user.openPrivateChannel()
        .flapMap(channel -> channel.sendMessage(content))
        .queue(null, new ErrorHandler()
            .handle(ErrorResponse.CANNOT_SEND_TO_USER,
                (ex) -> System.out.println("Cannot send message to user")));
}

Upvotes: 3

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