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This describes Keydra as it is being built and is not a released version. What it documents can change before a release.

Pub/Sub

Subscribe to channels and patterns and publish to them. The subscription belongs to the server, so every tab sees the same messages.

How subscriptions work here#

A subscription belongs to the server, not to your browser tab. Keydra subscribes once and fans the messages out over the notification hub, so every tab — and every colleague — sees the same messages, and closing a tab does not end the subscription.

The Pub/Sub page, with channels and patterns to subscribe to beside the messages that arrive

That is also why subscribing is not something the console does: SUBSCRIBE never returns, and the console’s connection is shared.

Channels and patterns are both supported. A pattern subscription uses PSUBSCRIBE, so news.* follows every channel under news.

Subscribing to a channel and publishing to one#

Prerequisites

  • pubsub:subscribe to listen, pubsub:publish to send.

Procedure

To listen:

  1. Open the target and go to Pub/Sub.

  2. Enter one or more Channels — the placeholder shows the shape, news, events — or Patterns, such as news.*.

  3. Click Subscribe. If a subscription is already open, the button reads Replace subscription.

  4. Stop listening ends it, for everybody.

To publish:

  1. Complete Channel and Message.

  2. Click Publish.

Verification

Messages appear under Messages with the time they were Received. While a subscription is open and nothing has arrived, the panel says so rather than looking broken: The subscription is open; anything published to it appears here.

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