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beaver.js

beaver maintains an up-to-date hyperlocal context graph by consuming the real-time data stream from Pareto Anywhere APIs.

Overview of beaver.js

beaver is lightweight client-side JavaScript that runs in the browser. See a live demo using the code in this repository at: reelyactive.github.io/beaver

Hello beaver!

Include in an index.html file the beaver.js script:

<html>
  <head></head>
  <body>
    <script src="js/beaver.js"></script>
    <script src="js/app.js"></script>
  </body>
</html>

Include in a js/app.js the code to connect to a Pareto Anywhere instance:

beaver.stream('http://pareto.local', { /* Options: see below */ });

Open the index.html file in a web browser for beaver to connect to the Pareto Anywhere instance and begin maintaining the hyperlocal context graph.

Supported functions

stream

let serverRootUrl = 'http://pareto.local';
let options = { /* See below */ };

let streams = beaver.stream(serverRootUrl, options);

If the serverRootUrl is provided, and valid, beaver will HTTP GET the /context route once to establish the hyperlocal context graph. The options are as follows:

Property	Default	Description
deviceSignature	null	Specific device to stream (default all devices)
io	null	Socket.IO dependency
ioUrl	null	Override default URL for Socket.IO to listen on
wsUrl	null	Specific URL for WebSocket to listen on

For example, to stream using Socket.IO from a Pareto Anywhere server at pareto.local, filtering for a specific device:

// Include <script src="js/socket.io.min.js"></script> in the index.html
let options = { deviceSignature: "bada55beac04/2", io: io };

beaver.stream('http://pareto.local', options);

For example, to stream using WebSockets from a Pareto Anywhere for Azure server at pareto-anywhere.azurewebsites.net:

let options = { wsUrl: 'ws://pareto-anywhere.azurewebsites.net' };

beaver.stream(null, options);

poll

let serverRootUrl = 'http://pareto.local';
let options = { intervalMilliseconds: 5000 }; // {} to instead poll just once

beaver.poll(serverRootUrl, options);

Use beaver.on('poll') as notification of when each poll completes and the Map of beaver.devices is updated.

The options are as follows:

Property	Default	Description
intervalMilliseconds	null	Interval to poll (default poll just once)
deviceSignature	null	Specific device to poll (default all devices)
clearDevices	false	Clear all devices before polling

on

beaver.on('connect', () => {});
beaver.on('raddec', (raddec) => { /* radio decoding data */ });
beaver.on('dynamb', (dynamb) => { /* dynamic ambient data */ });
beaver.on('spatem', (spatem) => { /* spatial-temporal data */ });
beaver.on('appearance', (deviceSignature, device) => {
  /* beaver.devices added entity */
});
beaver.on('disappearance', (deviceSignature) => {
  /* beaver.devices removed entity */
});
beaver.on('poll' () => { /* beaver.devices is updated */ });
beaver.on('stats', (stats) => {
  // stats = {
  //     numberOfDecodings: Number,
  //     eventsPerSecond: { raddec: Number, dynamb: Number, spatem: Number }
  // }
});
beaver.on('error', (error) => { /* error.message */ });
beaver.on('disconnect', (reason) => { /* disconnect reason */ });

Read the reelyActive Developers Cheatsheet to learn more about the raddec, dynamb & spatem data structures.

Supported variables

Variable	Type	Description
`beaver.devices`	Map	Hyperlocal context graph: device signature as key

beaver logo

What's in a name?

After humans, beavers are the animals with the greatest impact on their ecosystem. Industrious and ingenious hydrological engineers, beavers build dams, filling the ponds which provide them food and protection. In turn, these basins of water provide food and habitat for diverse fauna and flora, contributing to a thriving ecosystem.

Introduced to the web browser habitat in 2016, beaver.js has adapted to fill ponds in your computer’s memory, collecting the steady stream of real-time events from an upstream source. In turn, this pool of data provides a staple food for other client-side Javascript species such as the occasional migratory cormorant.js.

Oh yeah, and the beaver is the national animal of Canada eh? And the oversized rodent is currently celebrating its 40th anniversary as the mascot of the 1976 Olympics of our native Montreal. We wood be dammed not to chews it as a mascot!

Don’t like our punny ending? Why not lodge a complaint?

Project History

beaver v2.0.0 was released in February 2023.

beaver.js v1.0.0 was released in July 2019, superseding all earlier versions, the latest of which remains available in the release-0.1 branch.

Modular Architecture

beaver.js is easily combined with the following complementary client-side modules:

Learn more about the reelyActive Open Source Software packages, all of which are bundled together as Pareto Anywhere open source IoT middleware.

Contributing

Discover how to contribute to this open source project which upholds a standard code of conduct.

Security

Consult our security policy for best practices using this open source software and to report vulnerabilities.

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.