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@dxos/broadcast
Advanced tools
Abstract module to send broadcast messages.
Allows a node to originate a message that will be received at least once, within a
reasonably short time, on all nodes that are reachable from the origin node. Messages are
propagated via the middleware
specified. Broadcast storms are
avoided by means of a flooding routing scheme.
Broadcast messages follows the schema:
message Packet {
bytes seqno = 1;
bytes origin = 2;
bytes from = 3;
bytes data = 4;
}
seqno
: By default is a random 32-bit but could be used to provide an alternative sorted sequence number.origin
: Represents the author's ID of the message. To identify a message (msgId
) in the network you should check for the: seqno + origin
.from
: Represents the current sender's ID of the message.data
: Represents an opaque blob of data, it can contain any data that the publisher wants
it to defined by higher layers (e.g. a presence information message).Nodes send any message originating locally to all current peers. Upon receiving a message, a node delivers it locally to any listeners, and forward the message on to its current peers, excluding the peer from which it was received.
Nodes maintain a record of the messages they have received and originated
recently, by msgId(seqno + from)
. This is used to avoid sending the same message to the same peer
more than once. These records expire after some time to limit memory consumption by: maxAge
and maxSize
.
$ npm install @dxos/broadcast
import { Broadcast } from '@dxos/broadcast';
const middleware = {
subscribe: (onData, updatePeers) => {
// Defines how to process incoming data and peers update.
// on('peers', onPeers)
// on('data', onData)
return () => {
// Return a dispose function.
}
},
send: async (packet, node) => {
// Define how to send your packets.
// "packet" is the encoded message to send.
// "node" is the peer object generate from the lookup.
}
};
const broadcast = new Broadcast(middleware, {
id: crypto.randomBytes(32),
maxAge: 15 * 1000, // Timeout for each message in the LRU cache.
maxSize: 1000 // Limit of messages in the LRU cache.
})
// We initialize the middleware and subscription inside the broadcast.
await broadcast.open()
broadcast.publish(Buffer.from('Hello everyone'))
await broadcast.close()
You can check a real example in: example
const broadcast = new Broadcast(middleware, [options])
middleware
: The middleware defines an interface to connect the broadcast to any request/response solution.
subscribe: ({ onData, onPeers }) => unsubscribeFunction
: Defines how to subscribe to incoming packets and peers update.
onData: (data: Buffer) => (Packet|undefined)
: Callback to process incoming data. It returns true if the broadcast could decode the message or false if not.onPeers: (peers: [Peer])
: Callback to update the internal list of peers. A Peer
object must follow the spec: { id: Buffer, ...props }
unsubscribeFunction: Function
: Defines a way to unsubscribe from listening messages if the broadcast stop working. Helpful if you are working with streams and event emitters.send: (packet: Buffer, peer: Object) => Promise
: Defines how to send the packet builded by the broadcast.options
id: Buffer
: Defines an id for the current peer. Default: crypto.randomBytes(32)
.maxAge: number
: Defines the max live time for the cache messages. Default: 10 * 1000
.maxSize: number
: Defines the max size for the cache messages. Default: 1000
.broadcast.open() => Promise
Initialize the cache and runs the defined subscription.
broadcast.close() => Promise
Clear the cache and unsubscribe from incoming messages.
broadcast.publish(data, [options]) -> Promise<Packet>
Broadcast a flooding message to the peers neighboors.
data: Buffer
: Any data that you want to broadcast.
options
seqno: Buffer
: Defines a custom seqno for the message. Default: crypto.randomBytes(32)
.Packet
seqno: Buffer
origin: Buffer
from: Buffer
data: Buffer
0.1.10 (2022-11-22)
FAQs
Abstract module to send broadcast messages.
The npm package @dxos/broadcast receives a total of 96 weekly downloads. As such, @dxos/broadcast popularity was classified as not popular.
We found that @dxos/broadcast demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 13 open source maintainers collaborating on the project.
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