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1632104709

A Flutter Package That Sends Logs to AWS CloudWatch

aws_cloudwatch

An easy, lightweight, and convenient way to reliably send logs to AWS CloudWatch.

Resources

Documentation       Pub Package       GitHub Repository 

If you have feedback or have a use case that isn't covered feel free to open an issue.

Getting Started

Create a CloudWatch instance and hen send a log

import 'package:aws_cloudwatch/aws_cloudwatch.dart';

CloudWatch cloudWatch = CloudWatch(
  _AWS_ACCESS_KEY_ID,
  _AWS_SECRET_ACCESS_KEY,
  _Region,
  groupName: GROUP_NAME,
  streamName: STREAM_NAME,
);

cloudWatch.log('Hello World');

Quick Start

This is the quick start file. It is also location in example/aws_cloudwatch.dart

import 'package:aws_cloudwatch/aws_cloudwatch.dart';
import 'package:intl/intl.dart';

/// QUICK START LOGGING FILE
///
/// PLEASE FILL OUT THE FOLLOWING VARIABLES:

const String _AWS_ACCESS_KEY_ID = 'YOUR_ACCESS_KEY';
const String _AWS_SECRET_ACCESS_KEY = 'YOUR_SECRET_ACCESS_KEY';
const String _Region = 'YOUR_REGION_CODE'; // (us-west-1, us-east-2, etc)
const String _LogGroup = 'DESIRED_LOG_GROUP_NAME';
const String _ErrorGroup = 'DESIRED_ERROR_LOG_GROUP_NAME';

/// END OF VARIABLES

CloudWatchHandler logging = CloudWatchHandler(
  awsAccessKey: _AWS_ACCESS_KEY_ID,
  awsSecretKey: _AWS_SECRET_ACCESS_KEY,
  region: _Region,
  delay: Duration(milliseconds: 200),
);

String logStreamName = '';

// You may want to edit this function to suit your needs
String _getLogStreamName() {
  if (logStreamName == "") {
    logStreamName = DateFormat("yyyy-MM-dd HH-mm-ss").format(
      DateTime.now().toUtc(),
    );
  }
  return logStreamName;
}

void log(String logString, {isError = false}) {
  logging.log(
    msg: logString,
    logGroupName: isError ? _LogGroup : _ErrorGroup,
    logStreamName: _getLogStreamName(),
  );
}

Then just import this file somewhere in your code and call log('HELLO WORLD');. The package will handle creating the log groups and log streams on its own. The way the quick start file is set up, you will end up with one log group for standard logging and another for errors. Both with have the same log stream name. To automatically send logs for all flutter errors see example 3.

Examples

Example 1

Here's an example of using aws_cloudwatch to send a CloudWatch PutLogEvent request:

import 'package:aws_cloudwatch/aws_cloudwatch.dart';

// AWS Variables
const String AWS_ACCESS_KEY_ID = 'ExampleKey';
const String AWS_SECRET_ACCESS_KEY = 'ExampleSecret';
const String Region = 'us-west-2';

// Logging Variables
const String logGroupName = 'LogGroupExample';
const String logStreamName = 'LogStreamExample';
CloudWatch cloudWatch = CloudWatch(
  AWS_ACCESS_KEY_ID,
  AWS_SECRET_ACCESS_KEY,
  Region,
  groupName: logGroupName,
  streamName: logStreamName,
);

void log(String logString) {
  cloudWatch.log(logString);
}

Example 2

Here's an example of using aws_cloudwatch to send a CloudWatch PutLogEvent request with a 200-millisecond delay to avoid rate limiting:

import 'package:aws_cloudwatch/aws_cloudwatch.dart';

// AWS Variables
const String AWS_ACCESS_KEY_ID = 'ExampleKey';
const String AWS_SECRET_ACCESS_KEY = 'ExampleSecret';
const String Region = 'us-west-2';

// Logging Variables
const String logGroupName = 'LogGroupExample';
const String logStreamName = 'LogStreamExample';
CloudWatch cloudWatch = new CloudWatch(AWS_ACCESS_KEY_ID,
    AWS_SECRET_ACCESS_KEY, Region, groupName: logGroupName,
    streamName: logStreamName, delay: Duration(milliseconds: 200));

void log(String logString) {
  cloudWatch.log(logString);
}

By adding a 200-millisecond delay, aws_cloudwatch will send more logs at a time and will be limited to sending api requests at most once every 200 milliseconds. This can reduce the chance of hitting the AWS CloudWatch logging rate limit of 5 requests per second per log stream.

Example 3

Here is an example of how to capture all errors in flutter and send them to CloudWatch. First create this file and name it errorLog.dart

import 'package:aws_request/aws_cloudwatch.dart';
import 'package:intl/intl.dart';

// AWS Variables
const String AWS_ACCESS_KEY_ID = 'ExampleKey';
const String AWS_SECRET_ACCESS_KEY = 'ExampleSecret';
const String Region = 'us-west-2';

// Logging Variables
const String logGroupName = 'LogGroupExample';
const String logGroupNameError = 'LogGroupExample';

CloudWatchHandler logging = CloudWatchHandler(
  awsAccessKey: AWS_ACCESS_KEY_ID,
  awsSecretKey: AWS_SECRET_ACCESS_KEY,
  region: Region,
);

String logStreamName = '';

// You may want to edit this function to suit your needs
String _getLogStreamName() {
  if (logStreamName == "") {
    logStreamName = DateFormat("yyyy-MM-dd HH-mm-ss").format(
      DateTime.now().toUtc(),
    );
  }
  return logStreamName;
}

void log(String logString, {isError = false}) {
  logging.log(
    msg: logString,
    logGroupName: isError ? logGroupNameError : logGroupName,
    logStreamName: _getLogStreamName(),
  );
}

void logFlutterSystemError(dynamic logString, dynamic stackTrace) async {
  log(
    'Auto Captured Error: ${logString.toString()}\n\n'
        'Auto Captured Stack Trace:\n${stackTrace.toString()}',
    isError: true,
  );
}

Then modify your main.dart to look like the following

import 'dart:async';
import 'app.dart';

import 'errorLog.dart';

void main() {
  runZonedGuarded<Future<void>>(() async {
    Function originalOnError = FlutterError.onError;
    FlutterError.onError = (FlutterErrorDetails errorDetails) async {
      Zone.current
          .handleUncaughtError(errorDetails.exception, errorDetails.stack);
      originalOnError(errorDetails);
    };
    runApp(MyApp());
  }, (error, stackTrace) async {
    logFlutterSystemError(error, stackTrace);
    print(error.toString());
    throw error;
  });
}

To send normal logs, import the logging file anywhere and call log('Hello world!');

Important Notes:

Avoiding AWS Cloudwatch API Rate Limiting

As of now (2021/09/12), AWS has a rate limit of 5 log requests per second per log stream. You may hit this limit rather quickly if you have a high volume of logs. It is highly recommended to include the optional delay parameter with a value of Duration(milliseconds: 200) to avoid hitting this upper limit. With a delay, logs will continue to collect, but the api calls will be limited to 1 / delay per second. For example, a delay of 200 milliseconds would result in a maximum of 5 api requests per second. At the moment there is no way to increase this limit.

Example 2 shows how to add a delay. The default delay is Duration(milliseconds: 0).

Retrying Failed Requests

Sometimes API requests can fail. This is especially true for mobile devices going in and out of cell service. Both the CloudWatch constructor and the CloudWatchHandler constructor can take the optional parameter retries indicating how many times an api request will be attempted before giving up. The default retries value is 3.

Log Groups and Log Streams

Log stream names currently (2021/09/12) have the following limits:

  • Log stream names must be unique within the log group.
  • Log stream names can be between 1 and 512 characters long.
  • The ':' (colon) and '*' (asterisk) characters are not allowed.

Log group names currently (2021/09/12) have the following limits:

  • Log group names can be between 1 and 512 characters long and match to ^[.-_/#A-Za-z0-9]+$.

Message Size and Length Limits

AWS has hard limits on the amount of messages, length of individual messages, and overall length of message data sent per request. Currently, (2021/09/12) that limit is 10,000 messages per request, 262,118 UTF8 bytes per message, and 1,048,550 total message UTF8 bytes per request. The optional parameter largeMessageBehavior specifies how messages larger than 262,118 UTF8 bytes will be handled. By default, the middle of the message will be replaced with ... to reduce the size to 262,118 UTF8 bytes. All other hard limits are handled automatically.

Use this package as a library

Depend on it

Run this command:

With Dart:

 $ dart pub add aws_cloudwatch

With Flutter:

 $ flutter pub add aws_cloudwatch

This will add a line like this to your package's pubspec.yaml (and run an implicit dart pub get):

dependencies:
  aws_cloudwatch: ^0.4.2

Alternatively, your editor might support dart pub get or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:aws_cloudwatch/aws_cloudwatch.dart';

example/aws_cloudwatch.dart

import 'package:aws_cloudwatch/aws_cloudwatch.dart';
import 'package:intl/intl.dart';

/// QUICK START LOGGING FILE
///
/// PLEASE FILL OUT THE FOLLOWING VARIABLES:

const String _AWS_ACCESS_KEY_ID = 'YOUR_ACCESS_KEY';
const String _AWS_SECRET_ACCESS_KEY = 'YOUR_SECRET_ACCESS_KEY';
const String _Region = 'YOUR_REGION_CODE'; // (us-west-1, us-east-2, etc)
const String _LogGroup = 'DESIRED_LOG_GROUP_NAME';
const String _ErrorGroup = 'DESIRED_ERROR_LOG_GROUP_NAME';

/// END OF VARIABLES

CloudWatchHandler logging = CloudWatchHandler(
  awsAccessKey: _AWS_ACCESS_KEY_ID,
  awsSecretKey: _AWS_SECRET_ACCESS_KEY,
  region: _Region,
  delay: Duration(milliseconds: 200),
);

String logStreamName = '';

// You may want to edit this function to suit your needs
String _getLogStreamName() {
  if (logStreamName == "") {
    logStreamName = DateFormat("yyyy-MM-dd HH-mm-ss").format(
      DateTime.now().toUtc(),
    );
  }
  return logStreamName;
}

void log(String logString, {isError = false}) {
  logging.log(
    msg: logString,
    logGroupName: isError ? _ErrorGroup : _LogGroup,
    logStreamName: _getLogStreamName(),
  );
}

Download Details:

Author: Zsmerritt

Source Code: https://github.com/Zsmerritt/Flutter_AWS_CloudWatch

#flutter #aws 

What is GEEK

Buddha Community

A Flutter Package That Sends Logs to AWS CloudWatch
Destiny Volkman

Destiny Volkman

1597014000

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.

sksl_warm-up

If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.

flutter_autofill

A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSlider, DatePicker with support for date range and time picker with the new style.

flutter_DatePicker

New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

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Terry Tremblay

Terry Tremblay

1598396940

What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).

flutter-mobile-desktop-web-embedded_min

Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.

There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.

Flutter meaning?

What is Flutter? this question comes to many new developer’s mind.

humming_bird_dart_flutter

Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.

So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.

Where Flutter is used?

Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are

Dream11

Dream11

NuBank

NuBank

Reflectly app

Reflectly app

Abbey Road Studios

Abbey Road Studios

and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.

Flutter as a service

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Punith Raaj

1644991598

The Ultimate Guide To Tik Tok Clone App With Firebase - Ep 2

The Ultimate Guide To Tik Tok Clone App With Firebase - Ep 2
In this video, I'm going to show you how to make a Cool Tik Tok App a new Instagram using Flutter,firebase and visual studio code.

In this tutorial, you will learn how to Upload a Profile Pic to Firestore Data Storage.

🚀 Nice, clean and modern TikTok Clone #App #UI made in #Flutter⚠️

Starter Project : https://github.com/Punithraaj/Flutter_Tik_Tok_Clone_App/tree/Episode1

► Timestamps 
0:00 Intro 0:20 
Upload Profile Screen 
16:35 Image Picker
20:06 Image Cropper 
24:25 Firestore Data Storage Configuration.

⚠️ IMPORTANT: If you want to learn, I strongly advise you to watch the video at a slow speed and try to follow the code and understand what is done, without having to copy the code, and then download it from GitHub.

► Social Media 
GitHub: https://github.com/Punithraaj/Flutter_Tik_Tok_Clone_App.git
LinkedIn: https://www.linkedin.com/in/roaring-r...
Twitter: https://twitter.com/roaringraaj
Facebook: https://www.facebook.com/flutterdartacademy

► Previous Episode : https://youtu.be/QnL3fr-XpC4
► Playlist: https://youtube.com/playlist?list=PL6vcAuTKAaYe_9KQRsxTsFFSx78g1OluK

I hope you liked it, and don't forget to like,comment, subscribe, share this video with your friends, and star the repository on GitHub!
⭐️ Thanks for watching the video and for more updates don't forget to click on the notification. 
⭐️Please comment your suggestion for my improvement. 
⭐️Remember to like, subscribe, share this video, and star the repo on Github :)

Hope you enjoyed this video!
If you loved it, you can Buy me a coffee : https://www.buymeacoffee.com/roaringraaj

LIKE & SHARE & ACTIVATE THE BELL Thanks For Watching :-)
 
https://youtu.be/F_GgZVD4sDk

#flutter tutorial - tiktok clone with firebase #flutter challenge @tiktokclone #fluttertutorial firebase #flutter firebase #flutter pageview #morioh #flutter

Punith Raaj

1640672627

Flutter Hotel Booking UI - Book your Stay At A New Hotel With Flutter - Ep1

https://youtu.be/-tHUmjIkGJ4
Flutter Hotel Booking UI - Book your Stay At A New Hotel With Flutter - Ep1
#flutter #fluttertravelapp #hotelbookingui #flutter ui design 

In this video, I'm going to show you how to make a Cool Hotel Booking App using Flutter and visual studio code. 

In this tutorial, you will learn how to create a Splash Screen and Introduction Screen, how to implement a SmoothPageIndicator in Flutter. 

🚀 Nice, clean and modern Hotel Booking #App #UI made in #Flutter 

⚠️ IMPORTANT: If you want to learn, I strongly advise you to watch the video at a slow speed and try to follow the code and understand what is done, without having to copy the code, and then download it from GitHub. 

► Social Media 

    GitHub: https://github.com/Punithraaj 

    LinkedIn: https://www.linkedin.com/in/roaring-r...

    Twitter: https://twitter.com/roaringraaj

    Facebook: https://www.facebook.com/flutterdartacademy

I hope you liked it, and don't forget to like,comment, subscribe, share this video with your friends, and star the repository on GitHub! 

⭐️ Thanks for watching the video and for more updates don't forget to click on the notification.⭐️Please comment your suggestion for my improvement. ⭐️Remember to like, subscribe, share this video, and star the repo on Github :)Hope you enjoyed this video! If you loved it, you can Buy me a coffee : https://www.buymeacoffee.com/roaringraaj

#flutter riverpod #flutter travel app #appointment app flutter #morioh

Rory West

Rory West

1620928440

How to stream AWS CloudWatch logs to LOGIQ

AWS CloudWatch is an observability and monitoring service that provides you with actionable insights to monitor your applications, stay on top of performance changes, and optimize resource utilization while providing a centralized view of operational health. AWS CloudWatch collects operational data of your AWS resources, applications, and services running on AWS and on-prem servers in the form of logs, metrics, and events. CloudWatch then uses this data to help detect and troubleshoot issues and errors in your environments, visualize logs and metrics, set up and take automated actions, and uncover insights that help keep your applications and deployments running smoothly.

AWS CloudWatch provides excellent observability for your applications and infrastructure hosted on AWS. But what about your applications and resources hosted on service providers? While you can stream their logs into CloudWatch using proxies and exporters, it isn’t that straightforward. You’d have to monitor them separately using a your service provider’s own monitoring tool or build something in-house using Prometheus or Grafana, maybe. Why train your eyes to watch multiple monitoring tools when you can centralize monitoring and observability across your on-premise servers and cloud providers with LOGIQ? LOGIQ plugs into numerous data sources to centralize your logs and visualize them in a single pane regardless of the service provider.

#aws #aws cloudwatch logs #aws cloudwatch