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enlil

father of nirgali

lord of the winds

Backend application for a lightweight realtime deviation system.

Consists of two parts:

  1. A GraphQL API for managing situation messages, cancellations and extra-journeys
  2. A SIRI endpoint for requesting SIRI-SX or SIRI-ET versions of the same data

Data is stored in a Firestore database.

GraphQL

A GraphQL API is available at /graphl, to be used by frontend application (nirgali). It allows authorized users to manage data within their assigned codespace / organisation.

SIRI

Situation messages, cancellations and extra-journeys in the Firestore database are mapped to SIRI-SX and SIRI-ET after retrieval. A REST-endpoint (/siri) is exposed to request SIRI XML via HTTP POST:

Request for SIRI-SX (SituationExchangeRequest):

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Siri version="2.0" xmlns="http://www.siri.org.uk/siri" xmlns:ns2="http://www.ifopt.org.uk/acsb" xmlns:ns3="http://www.ifopt.org.uk/ifopt" xmlns:ns4="http://datex2.eu/schema/2_0RC1/2_0">
  <ServiceRequest>
    <RequestTimestamp>2020-02-10T08:57:23.397883+01:00</RequestTimestamp>
    <RequestorRef>ENTUR_DEV</RequestorRef>
    <SituationExchangeRequest version="2.0">
      <RequestTimestamp>2020-02-10T08:57:23.397893+01:00</RequestTimestamp>
      <MessageIdentifier>de353056-466d-44ef-a405-d11311281810</MessageIdentifier>
      <PreviewInterval>PT10H</PreviewInterval>
    </SituationExchangeRequest>
  </ServiceRequest>
</Siri>

Request for SIRI-ET (EstimatedTimetableRequest):

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Siri version="2.0" xmlns="http://www.siri.org.uk/siri" xmlns:ns2="http://www.ifopt.org.uk/acsb" xmlns:ns3="http://www.ifopt.org.uk/ifopt" xmlns:ns4="http://datex2.eu/schema/2_0RC1/2_0">
  <ServiceRequest>
    <RequestTimestamp>2019-11-06T14:45:00+01:00</RequestTimestamp>
    <RequestorRef>ENTUR_DEV-1</RequestorRef>
    <EstimatedTimetableRequest version="2.0">
      <RequestTimestamp>2019-11-06T14:45:00+01:00</RequestTimestamp>
      <MessageIdentifier>e11d9efb-ee7b-4a67-847a-a254e813f0da</MessageIdentifier>
    </EstimatedTimetableRequest>
  </ServiceRequest>
</Siri>