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Unify dispatch of LVAlert and GCN messages using decorators

Leo P. Singer requested to merge leo-singer/gwcelery:unify-lvalert-and-gcn-dispatch into master

GCN notice handlers are declared like this:

import lxml.etree
from gwcelery.tasks import gcn

@gcn.handler(gcn.NoticeType.FERMI_GBM_GND_POS,
             gcn.NoticeType.FERMI_GBM_FIN_POS)
def handle_fermi(payload):
    root = lxml.etree.fromstring(payload)
    # do work here...

LVAlert message handlers are declared like this:

import json
from gwcelery.tasks import lvalert

@lvalert.handler('cbc_gstlal',
                 'cbc_pycbc',
                 'cbc_mbta')
def handle_cbc(alert_content):
    alert = json.loads(alert_content)
    # do work here...
Edited by Leo P. Singer

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