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Description:

eventflux

EventFlux is a Dart package designed for efficient handling of server-sent event streams. It provides easy-to-use connectivity, data management, and robust error handling for real-time data applications. 🚀
Supported Platforms #

Android
iOS
Web
MacOS
Windows
Linux

✅
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🏗️
✅
❓
❓

Pssst... see those question marks? That's your cue, tech adventurers! Dive in, test, and tell me all about it. 🚀🛠️
Inspiration 💡 #
EventFlux was born from the inspiration I found in the flutter_client_sse package by Pratik Baid. His work laid a great foundation, and I aimed to build upon it, adding my own twist to enhance SSE stream management with better features. 🛠️
Why EventFlux? 🌟 #

Streamlined Connection Handling: Easy setup for connecting to event streams with support for both GET and POST requests. 🔌
Auto-Reconnect Capability: Seamlessly maintains your connection, automatically reconnecting in case of any server interruptions or network changes. Devs can choose to do linear or exponential backoff 🔄
Real-Time Data Management: Efficient processing and handling of real-time data streams. 📈
Error Handling: Robust mechanisms to manage connection interruptions and stream errors. 🛡️
Versatile Instance Creation: Offers both singleton and factory patterns for tailored SSE connections. 🌍
Customizable: Extendable to fit various use cases and custom implementations. ✨

EventFlux for Every Scenario 🌟 #

Get Started in a Snap 📦 #
Add EventFlux to your Dart project's dependencies, and you're golden:
dependencies:
eventflux: ^2.2.0
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How to Use (Spoiler: It's Super Easy) 🔧 #
Here's a quick example to get you started:

The Simple Streamer ✨

Need just one SSE connection? It's a breeze with EventFlux! Perfect for when your app is dancing solo with a single SSE.
import 'package:eventflux/eventflux.dart';

void main() {
// Connect and start the magic!
EventFlux.instance.connect(
EventFluxConnectionType.get,
'https://example.com/events',
onSuccessCallback: (EventFluxResponse? response) {
response.stream?.listen((data) {
// Your data is now in the spotlight!
});
},
onError: (oops) {
// Oops! Time to handle those little hiccups.
// You can also choose to disconnect here
},
autoReconnect: true // Keep the party going, automatically!
reconnectConfig: ReconnectConfig(
mode: ReconnectMode.linear, // or exponential,
interval: Duration(seconds: 5),
reconnectHeader: () async {
/// If you want to send custom headers during reconnect which are different from the initial connection
/// If you don't want to send any headers, you can skip this, initial headers will be used

// Your async code to refresh or fetch headers
// For example, fetching a new access token:
String newAccessToken = await fetchNewAccessToken();
return {
'Authorization': 'Bearer $newAccessToken',
'Accept': 'text/event-stream',
};
},
maxAttempts: 5, // or -1 for infinite,
onReconnect: () {
// Things to execute when reconnect happens
// FYI: for network changes, the `onReconnect` will not be called.
// It will only be called when the connection is interupted by the server and eventflux is trying to reconnect.
}
),
);
}

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Supercharged 🚀

When your app just need a multiple parallel SSE connections, use this.
import 'package:eventflux/eventflux.dart';

void main() {

// Create separate EventFlux instances for each SSE connection
EventFlux e1 = EventFlux.spawn();
EventFlux e2 = EventFlux.spawn();

// First connection - firing up!
e1.connect(EventFluxConnectionType.get,
'https://example1.com/events',
tag: "SSE Connection 1", // Optional tag for debugging, you'll see this in logs
onSuccessCallback: (EventFluxResponse? data) {
data.stream?.listen((data) {
// Your 1st Stream's data is being fetched!
});
},
onError: (oops) {
// Oops! Time to handle those little hiccups.
// You can also choose to disconnect here
},
);

// Second connection - firing up!
e2.connect(EventFluxConnectionType.get,
'https://example2.com/events',
tag: "SSE Connection 2", // Optional tag for debugging, you'll see this in logs
onSuccessCallback: (EventFluxResponse? data) {
data.stream?.listen((data) {
// Your 2nd Stream's data is also being fetched!
});
},
onError: (oops) {
// Oops! Time to handle those little hiccups.
// You can also choose to disconnect here
},
autoReconnect: true // Keep the party going, automatically!
reconnectConfig: ReconnectConfig(
mode: ReconnectMode.exponential, // or linear,
interval: Duration(seconds: 5),
maxAttempts: 5, // or -1 for infinite,
reconnectHeader: () async {
/// If you want to send custom headers during reconnect which are different from the initial connection
/// If you don't want to send any headers, you can skip this, initial headers will be used

// Your async code to refresh or fetch headers
// For example, fetching a new access token:
String newAccessToken = await fetchNewAccessToken();
return {
'Authorization': 'Bearer $newAccessToken',
'Accept': 'text/event-stream',
};
},
onReconnect: () {
// Things to execute when reconnect happens
// FYI: for network changes, the `onReconnect` will not be called.
// It will only be called when the connection is interupted by the server and eventflux is trying to re-establish the connection.
}
),
);
}

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ℹ️ Remember to disconnect all instances when you are done with it to avoid memory leaks.

Need More Info? 📚 #

EventFlux: Main class for managing event streams.
ReconnectConfig: Configuration for auto-reconnect.
EventFluxData: Data model for events received from the stream.
EventFluxException: Custom exception handling for EventFlux operations.
EventFluxResponse: Encapsulates the response from EventFlux operations.
Enums: EventFluxConnectionType for specifying connection types and EventFluxStatus for connection status.

For detailed documentation, please see the respective Dart files in the lib folder.
EventFlux Class Documentation 📖 #
EventFlux is a Dart class for managing server-sent event streams. It provides methods for connecting to, disconnecting from, and managing SSE streams.

Connect

Connects to a server-sent event stream.

Parameter
Type
Description
Default

type
EventFluxConnectionType
The type of HTTP request (GET or POST).
-

url
String
The URL of the SSE stream to connect to.
-

header
Map<String, String>
HTTP headers for the request.
{'Accept': 'text/event-stream'}

onConnectionClose
Function()?
Callback function triggered when the connection is closed.
-

autoReconnect
bool
Whether to automatically reconnect on disconnection.
false

reconnectConfig
ReconnectConfig?
Configuration for auto-reconnect. If auto-reconnect is true, this is required
-

onSuccessCallback
Function(EventFluxResponse?)
Callback invoked upon successful connection.
-

onError
Function(EventFluxException)?
Callback for handling errors.
-

body
Map<String, dynamic>?
Optional body for POST request types.
-

Disconnect

Disconnects from the SSE stream.

Parameter
Type
Description

-
-
This method has no parameters.

Returns a Future<EventFluxStatus> indicating the disconnection status.

Spawn

Parameter
Type
Description

-
-
This method has no parameters.

Returns a new instance of EventFlux, this is used for having multiple SSE connections.

Be a Part of the Adventure 🤝 #
Got ideas? Want to contribute? Jump aboard! Open an issue or send a pull request. Let's make EventFlux even more awesome together!
The Boring (but Important) Stuff 📝 #
Licensed under MIT - use it freely, but let's play nice and give credit where it's due!