server/fgs/views.py

from . import app, db
from .jwt import jwt_required
from .model import *
from flask import g, jsonify, request, abort
from sqlalchemy import func
import geopy.distance

@app.route('/')
def index():
    return 'Hello, world!'

@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')
    if username is None or password is None: abort(400)
    user = User.query.filter_by(username=username).first()
    if user is None or not user.check_password(password): abort(400)
    return jsonify({ 'token': user.get_jwt().decode() })

@app.route('/me')
@jwt_required
def me():
    return jsonify({ 'username' : g.user.username })

@app.route('/collars')
@jwt_required
def collars():
    active_collars = []
    for collar in Collar.query.filter_by(active=True).all():
        max_point = DataPoint.query.filter_by(collar_id=collar.id).\
                order_by(DataPoint.datetime.desc()).\
                first()
        active_collars.append(
            {'id': collar.id, 'name': collar.name, 'pos':
                {'longitude': max_point.longitude, 'latitude': max_point.latitude}}
        )

    return jsonify(active_collars)

@app.route('/collars/stats/distance')
@jwt_required
def collars_distance():
    active_collars = []
    for collar in Collar.query.filter_by(active=True).all():
        coords = DataPoint.query.filter_by(collar_id=collar.id).\
                order_by(DataPoint.datetime.desc())
  
        distance_kilometers = 0
        coords_pairs = list(map(lambda e : (e.longitude, e.latitude), coords))

        coord_last = coords_pairs.pop()
        for coord in coords_pairs:
            distance_kilometers += geopy.distance.VincentyDistance(coord_last,coord).km
            coord_last = coord
         
        active_collars.append(
            {'id': collar.id, 'name': collar.name, 
                'distance': distance_kilometers }
        )

    return jsonify(active_collars)

@app.route('/collars/<int:id>/history')
@jwt_required
def collar_history(id):
    collar = Collar.query.filter_by(id=id).first()
    if collar is None: abort(404)

    data_points = DataPoint.query.\
            filter_by(collar_id=id).\
            order_by(DataPoint.datetime.desc()).\
            all()
    return jsonify([point.to_dict() for point in data_points])