server.py


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import json

import algorithms
import store
from lib import run_server, get, post, read_html

grids = None
nodes = None
unconnected_nodes = None


@get('/')
def index():
    global nodes
    global grids
    global unconnected_nodes
    nodes, grids, unconnected_nodes = store.extract_osm_nodes("linkoping.osm")

    return read_html('templates/index.html')


@get('/favicon.ico')
def favicon():
    with open("data/favicon.ico", "rb") as image:
        read_image = image.read()
        image_bytes = bytearray(read_image)

    return image_bytes


@post('/shortest-path')
def shortest_path(body):
    body = json.loads(body)

    transport_mode = body['transport_mode']
    relevant_grid = grids[transport_mode]
    relevant_nodes = nodes[transport_mode]

    source_id = algorithms.grid_search(relevant_grid,
                                       body['lat1'],
                                       body['lng1'])
    target_id = algorithms.grid_search(relevant_grid,
                                       body['lat2'],
                                       body['lng2'])

    path = algorithms.find_shortest_path(nodes[transport_mode],
                                         source_id,
                                         target_id)
    return json.dumps({"path": [(relevant_nodes[node].lat,
                                 relevant_nodes[node].lng)
                       for node in path]})


run_server()