Lesson 3. Logging

Good afternoon everyone! Did you look into the console? Kinda empty ya? Now, we want to see something, isn't it? Let's make a logging function!

Creating project

As always, open IntelliJ IDEA and create a new project. Within the src folder create two files: Main.java and LoggingTestBot.java. Let's create a body of our bot:

public class LoggingTestBot implements LongPollingSingleThreadUpdateConsumer {
    private TelegramClient telegramClient = new OkHttpTelegramClient("12345:YOUR_TOKEN");

    @Override
    public void consume(Update update) {
        // We check if the update has a message and the message has text
        if (update.hasMessage() && update.getMessage().hasText()) {
            // Set variables
            String message_text = update.getMessage().getText();
            long chat_id = update.getMessage().getChatId();

            SendMessage message = SendMessage // Create a message object object
                .builder()
                .chatId(chat_id)
                .text(message_text)
                .build();
            try {
                telegramClient.execute(message); // Sending our message object to user
            } catch (TelegramApiException e) {
                e.printStackTrace();
            }
        }
    }
}

And our startup file:

import org.telegram.telegrambots.longpolling.TelegramBotsLongPollingApplication;

public class Main {
    public static void main(String[] args) {
        String botToken = "12345:YOUR_TOKEN";
        try (TelegramBotsLongPollingApplication botsApplication = new TelegramBotsLongPollingApplication()) {
            botsApplication.registerBot(botToken, new LoggingTestBot(botToken));
            System.out.println("LoggingTestBot successfully started!");
            Thread.currentThread().join();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Logs, where are you?

Lets set additional variables for logging:

public void consume(Update update) {
    // We check if the update has a message and the message has text
    if (update.hasMessage() && update.getMessage().hasText()) {
        // Set variables
        String user_first_name = update.getMessage().getChat().getFirstName();
        String user_last_name = update.getMessage().getChat().getLastName();
        String user_username = update.getMessage().getChat().getUserName();
        long user_id = update.getMessage().getChat().getId();
        String message_text = update.getMessage().getText();
        long chat_id = update.getMessage().getChatId();

        SendMessage message = SendMessage // Create a message object object
                .builder()
                .chatId(chat_id)
                .text(message_text)
                .build();
        try {
            telegramClient.execute(message); // Sending our message object to user
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
}

Create logging function:

Add new private function:

private void log(String first_name, String last_name, String user_id, String txt, String bot_answer) {
        System.out.println("\n ----------------------------");
        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        Date date = new Date();
        System.out.println(dateFormat.format(date));
        System.out.println("Message from " + first_name + " " + last_name + ". (id = " + user_id + ") \n Text - " + txt);
        System.out.println("Bot answer: \n Text - " + bot_answer);
    }

Now we just need to call this function when we want to log

public void onUpdateReceived(Update update) {
    // We check if the update has a message and the message has text
    if (update.hasMessage() && update.getMessage().hasText()) {
        // Set variables
        String user_first_name = update.getMessage().getChat().getFirstName();
        String user_last_name = update.getMessage().getChat().getLastName();
        String user_username = update.getMessage().getChat().getUserName();
        long user_id = update.getMessage().getChat().getId();
        String message_text = update.getMessage().getText();
        long chat_id = update.getMessage().getChatId();
        String answer = message_text;
        SendMessage message = SendMessage // Create a message object object
                .builder()
                .chatId(chat_id)
                .text(message_text)
                .build();
        log(user_first_name, user_last_name, Long.toString(user_id), message_text, answer);
        try {
            telegramClient.execute(message); // Sending our message object to user
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
}

Our files:

package org.telegram.telegrambots.tutorial.Lesson3.src;

import org.telegram.telegrambots.longpolling.TelegramBotsLongPollingApplication;

public class Main {
    public static void main(String[] args) {
        String botToken = "12345:YOUR_TOKEN";
        try (TelegramBotsLongPollingApplication botsApplication = new TelegramBotsLongPollingApplication()) {
            botsApplication.registerBot(botToken, new LoggingTestBot(botToken));
            System.out.println("LoggingTestBot successfully started!");
            Thread.currentThread().join();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package org.telegram.telegrambots.tutorial.Lesson3.src;

import org.telegram.telegrambots.client.okhttp.OkHttpTelegramClient;
import org.telegram.telegrambots.longpolling.util.LongPollingSingleThreadUpdateConsumer;
import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
import org.telegram.telegrambots.meta.api.objects.Update;
import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
import org.telegram.telegrambots.meta.generics.TelegramClient;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class LoggingTestBot implements LongPollingSingleThreadUpdateConsumer {

    private final TelegramClient telegramClient;

    public LoggingTestBot(String botToken) {
        telegramClient = new OkHttpTelegramClient(botToken);
    }

    @Override
    public void consume(Update update) {
        // We check if the update has a message and the message has text
        if (update.hasMessage() && update.getMessage().hasText()) {
            // Set variables
            String user_first_name = update.getMessage().getChat().getFirstName();
            String user_last_name = update.getMessage().getChat().getLastName();
            long user_id = update.getMessage().getChat().getId();
            String message_text = update.getMessage().getText();
            long chat_id = update.getMessage().getChatId();
            SendMessage message = SendMessage // Create a message object object
                    .builder()
                    .chatId(chat_id)
                    .text(message_text)
                    .build();
            log(user_first_name, user_last_name, Long.toString(user_id), message_text, message_text);
            try {
                telegramClient.execute(message); // Sending our message object to user
            } catch (TelegramApiException e) {
                e.printStackTrace();
            }
        }
    }

    private void log(String first_name, String last_name, String user_id, String txt, String bot_answer) {
        System.out.println("\n ----------------------------");
        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        Date date = new Date();
        System.out.println(dateFormat.format(date));
        System.out.println("Message from " + first_name + " " + last_name + ". (id = " + user_id + ") \n Text - " + txt);
        System.out.println("Bot answer: \n Text - " + bot_answer);
    }
}

You can also find all sources at GitHub repository.

Now it will do ugly log for us.

Well, that's all for now. In the next lesson, we will learn how to make your messages more beautiful with unicode emojis.

Last modified: 07 September 2024