validate_requests.py

# Copyright (c) 2019, IRIS-HEP
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#   this software without specific prior written permission.
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# this code gets requests in state: Created, Validates request on one file
# if request valid (all branches exist) it sets request state to Defined
# if not it sets state to Failed, deletes all the paths belonging to that request.

import datetime
import json
import sys

import requests
import argparse
import pika

parser = argparse.ArgumentParser(
    description='Validate a request.')

parser.add_argument('--rabbit-uri', dest="rabbit_uri", action='store',
                    default='host.docker.internal')

parser.add_argument('--avg-bytes', dest="avg_bytes_per_column", action='store',
                    help='Average number of bytes per column per event',
                    default='40')

parser.add_argument("--path", dest='path', action='store',
                    default=None,
                    help='Path to single Root file to transform')

parser.add_argument("--tree", dest='tree', action='store',
                    default="Events",
                    help='Tree from which columns will be inspected')


def validate_request(file_name):
    print("Validating file: " + file_name)

    try:
        return(True, {
            "max-event-size": 0
        })
    except Exception as eek:
        return False, "Could not compile generated code "+str(eek)


def post_status_update(endpoint, status_msg):
    requests.post(endpoint + "/status", data={
        "timestamp": datetime.datetime.now().isoformat(),
        "status": status_msg
    })


def post_transform_start(endpoint, info):
    requests.post(endpoint+"/start", json={
        "timestamp": datetime.datetime.now().isoformat(),
        "info": info
    })


def callback(channel, method, properties, body):
    validation_request = json.loads(body)

    service_endpoint = validation_request[u'service-endpoint']
    post_status_update(service_endpoint,
                       "Validation Request received")

    # checks the file
    (valid, info) = validate_request(validation_request[u'file-path'])

    if valid:
        post_status_update(service_endpoint,  "Request validated")
        post_transform_start(service_endpoint, info)
    else:
        post_status_update(service_endpoint, "Validation Request failed "+info)

    print(valid, info)
    channel.basic_ack(delivery_tag=method.delivery_tag)


if __name__ == "__main__":
    args = parser.parse_args()

    if args.path:
        # checks the file
        (valid, info) = validate_request(args.path)
        print(valid, info)
        sys.exit(0)

    rabbitmq = pika.BlockingConnection(
        pika.URLParameters(args.rabbit_uri)
    )
    _channel = rabbitmq.channel()
    _channel.queue_declare('validated_requests')

    _channel.basic_consume(queue="validation_requests",
                           auto_ack=False,
                           on_message_callback=callback)
    _channel.start_consuming()