Subscribing to database events

Arvados applications can subscribe to a live event stream from the database. Events are described in the Log resource.

#!/usr/bin/env python3

import arvados
import arvados.events

# 'ev' is a dict containing the log table record describing the change.
def on_message(ev):
    if ev.get("event_type") == "create" and ev.get("object_kind") == "arvados#collection":
        print "A new collection was created: %s" % ev["object_uuid"]

api = arvados.api("v1")
ws = arvados.events.subscribe(api, [], on_message)
ws.run_forever()

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