demo

Mama Demo

This demo periodically polls GTFS-RT feed of Warsaw's public transport and visualizes map matched positions of vehicles on a map.

Build and run

Prerequisites: osmium, wget and Docker.

1. ./build.sh - it prepares data and build required Docker images
2. docker compose up
3. Open web browser and navigate to http://127.0.0.1:8000/
4. You should see something like this(vehicles positions are updated ~ every 10 seconds):

Design

For basic understanding how this demo works look at this diagram:

sequenceDiagram 
  Browser->>Node: GET /
  Node-->>Browser: index.html
  loop Every second
    Node->>GTFS-RT: Request 
    GTFS-RT-->>Node: Vehicle positions
    Node->>Redis: Get map-matching states
    Redis-->>Node: Map-matching states or null
    Node->>Mama: Vehicle positions + Map-matching states
    Mama-->>Node: Map matched locations + Map-matching states
    Node->>Redis: Store map-matching states
    Node->>Browser: Map matched locations
  end

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