nu streaming plugin: nu_plugin_from_sse

This plugin was forked from the nu_plugin_stream_example.

With Nushell 0.91.0 @devyn has added support for plugins that operate on streams

This makes possible plugin's like nu_plugin_from_sse which parses a stream of HTTP server sent events.

nu_plugin_from_sse provides one command:

from sse

This command transforms HTTP SSE (Server-Sent Events) into structured records with the shape:

{
  id: string,    // Unique identifier for the SSE event
  event: string, // Type of event
  data: string   // Data payload of the event
}

known issue: nu table buffering

If your SSE endpoint dispatches initial events upon connection, then pauses—awaiting rare updates—you won't see any output until the first new update after connecting. This behavior is due to nu's table buffering mechanism, where a duration timeout is factored in only during active input processing.

An easy workaround for this issue is to pipe to each.

example

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event: creatureAlert
id: 1
data: {"id":"uni123","type":"Unicorn","lat":45.4235,"lon":-75.6979,"urgency":"high","desc":"Injured near Crystal River."}

Use bp to pipe it:

bp | from sse | update data { from json }

live example

http get https://ndyg.cross.stream/projects/enchanted-animal-rescue/rescue-feed |
    from sse |
    update data { from json }