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Add backup mongo URLs

Luca Scotto Lavina requested to merge mongo_urls into master

Created by: jorana

What is the problem / what does the code in this PR do Use Chicago and xenon1t-daq.lngs.infn.it as backup mongo instances for fried-rice.

Use fried-rice always as the first default as that is accessible outside dali

Can you briefly describe how it works? Try to connect to fried-rice, if it doesn't use a backup_mongo_url

Can you give a minimal working example (or illustrate with a figure)?

import strax
import straxen

RunDB = <see PR>

st = strax.Context(
        config=straxen.contexts.xnt_common_config,
        **straxen.contexts.common_opts)
username = straxen.get_secret('rundb_username')
password = straxen.get_secret('rundb_password')
st.storage = [RunDB(
        readonly=True,
        runid_field='number',
        new_data_path='./strax_data',
)
             ]
st.storage[0].client['xenonnt'].command('ping')

Difference with #212 Rather than having all tree in a single URL we split it to a to stage initialization. Otherwise if not on dali it cannot find the primary host.

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