SNEWS Publishing Tool

See the docs at

This packages provides users with a Python API and CLI to publish observation messages to SNEWS

Note: Make sure your hop credentials are set up !!
Follow the instructions here if needed
Request permissions to given topics here

How to Install

• From source
  

  First you need to clone this repo. In your terminal run the following:

  git clone https://github.com/SNEWS2/SNEWS_Publishing_Tools.git
  

  Once cloned, install the package using pip (make sure you're in the cloned dir)

  pip install .
  

• From PyPi
  

  pip install -U snews-pt
  

How to Publish

Before we get started, right now the publishing method will send your message to the test kafka server.

First you need to import your Publisher:

# Import the constructor for SNEWS Tiers and Publisher class
from snews_pt.snews_pub import SNEWSTiersPublisher

Passing Message Parameters as Arguments.

To send a message you need initialize the Publisher, construct your message by initializing SNEWSTiers and passing your parameters of choice. The backend will parse your arguments, check their data types and determine which tiers you can send a message to (see Publishing Protocols). If you pass multiple parameters (see code bellow) the sender will send a message all the appropriate tiers.

SNEWSTiersPublisher(detector_name='KamLAND', neutrino_time="2022-02-28T04:31:08.678999",
                    timing_series=["2022-02-28T04:31:08.694999", "2022-02-28T04:31:08.698999", "2022-02-28T04:31:08.7078945"],
                    p_val=0.000007,
                    machine_time="2022-02-28T04:31:09.778859", 
                    ).send_to_snews()

This instance has parameters for CoincidenceTier and TimingTier, thus it will send a message to both. The output should look like this:

Passing Message Parameters from JSON File.

You can also pass your input from a json file, and make modifications on the spot. Let's first create an observation object this time before sending it to snews;

observation = SNEWSTiersPublisher.from_json('my_input_asjson.json', 
                                            detector_name='XENONnT', 
                                            comment="This is submitted from a json file")

Here, we read the content from the 'my_input_asjson.json' file, and overwrite detector_name and also add a comment field (which will be accepted as a meta data). Notice we still haven't sent it to snews yet. You can display, and modify the parsed messages after you create the object instance. Depending on the fields you provided SNEWSTierPublisher will decide where to submit your data (see above). You can see these tier(s) and the individual message contents. See, observation.tiernames to get names of the tiers that your input message belongs, and observation.messages to display their content, and modify if desired.

Once you are done, you can just send that observation object to snews.

observation.send_to_snews()

See this examples notebook for more tutorial scripts

• See Publishing Protocols here

• See Message Schemas here

How to Subscribe

In two lines, one can subscribe to the alert topic specified in the default configuration.
This starts a stream, and waits for alert messages to be received.

from snews_pt.snews_sub import Subscriber

Subscriber().subscribe()

Should there be an alert message, this will be both displayed on the screen and saved into your local machine. The location can be passed as an argument subscribe(outputfolder='folder/path'), if not given, the default is used based on the "ALERT_OUTPUT" folder in the environment file. The message is then saved under this directory with a time stamp as folder/0_<date>_ALERTS.json and if there are multiple messages in the same day e.g. for the same supernova you kept receiving alerts with every coincidence message, the counter infront will be incremented. An example alert message (partly missing) can be found here

Command Line Interface (CLI)

There also exists tools for command line interactions. These are explained in detail here

Extension for follow-up plugins (only with CLI for now)

snews_pt subscribe also allows for other scripts to be plugged in and act on alerts. The CLI command snews_pt subscribe takes the custom made script via --plugin (-p) option.

user/home$: snews_pt subscribe -p ./auxiliary/custom_script.py

snews_pt subscribe saves the alert messages to a local JSON file with the date stamp of the received time. When a custom plugin is provided, as soon as an alert is received and JSON is created, the name of this unique-JSON file is passed to the script and executed.

Therefore, all custom-made scripts should contain the following two lines;

# in "custom_made_script.py"
import sys, json
data = json.load(open(sys.argv[1]))

and do the follow-up work using the data dictionary as the alert message. See [this dummy example]https://github.com/SNEWS2/SNEWS_Publishing_Tools/blob/main/snews_pt/test/random_plugin.py) which only brags about itself and displays you the content of the alert message.