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hops_server.py
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hops_server.py
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# This file is the hops server running in flask
from flask import Flask
import ghhops_server as hs
import json
import network as N
import math
import time
app = Flask(__name__)
hops = hs.Hops(app)
CATEGORY = 'Extra'
DEFAULT_ICON = 'icon_graph.png'
@hops.component(
'/',
name='Info',
description='Traffic simulation and analysis toolkit.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[],
outputs=[
hs.HopsString('Details', 'D', 'Details'),
hs.HopsString('Components', 'C', 'List of components available (use these in the address)')
]
)
def component_info():
"""Returns info about the hops server."""
return 'Created by Martin Ibbett, 2023', ['trim', 'simulation', 'pathfind', 'fillets', 'add_random_traffic', 'add_vehicles', 'add_markers', 'mapping_curves']
@hops.component(
'/trim',
name='Trim',
description='Trim a road network (shorten the road edges where they meet at intersections so there is no overlap).',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsNumber('Corner radius', 'Radius', 'Radius of intersection corners', optional=True)
],
outputs=[
hs.HopsString('Network', 'Network', 'Trimmed JSON network')
]
)
def component_trim(json_network, corner_radius=2):
json_network = json.loads(json_network)
network = N.load_packed_network(json_network)
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
network.trim_roads(15, corner_radius, 4)
return network.data()
@hops.component(
'/fillets',
name='Fillets',
description='Get fillet curves around intersections.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
],
outputs=[
hs.HopsString('Fillets', 'Fillets', 'Fillet curves as JSON'),
]
)
def component_fillets(json_network):
json_network = json.loads(json_network)
network = N.load_packed_network(json_network)
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
return network.get_fillets(True)
@hops.component(
'/random_traffic',
name='RandomTraffic',
description='Add random traffic to the road network.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsInteger('Count', 'Count', 'Number of vehicles to spawn'),
hs.HopsInteger('Seed', 'Seed', 'Seed value for randomness', optional=True),
],
outputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
]
)
def component_random_traffic(json_network, count, seed=0):
# Note that there is no generation of lane mapping yet, the simulator does it
N.set_seed(seed)
network = N.load_packed_network(json.loads(json_network))
if not isinstance(count, int) or count < 0: # if count is invalid, add vehicles to 1/5 of roads
count = math.ceil(len(network.roads) / 5)
network.add_random_traffic(count)
return network.data()
@hops.component(
'/add_vehicles',
name='AddVehicles',
description='Add vehicles to the road network. Note that a simpler RandomTraffic exists if you just need randomly distributed traffic on the network.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsString('Vehicles', 'Vehicles', 'JSON vehicle data as a list', access=hs.HopsParamAccess.LIST, optional=True),
],
outputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
]
)
def component_add_vehicles(json_network, vehicles=''):
# Note that there is no generation of lane mapping yet
network = N.load_packed_network(json.loads(json_network))
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
if 'lane_mapping' not in json_network['info']['properties']:
network.generate_lane_mapping()
for vehicle in vehicles:
if not vehicle == '':
vehicle: dict
network.add_vehicle(
vehicle['road_index'],
vehicle.get('lane_index', 0),
vehicle.get('t', 0),
vehicle.get('route', None),
vehicle.get('speed', None),
)
return network.data()
@hops.component(
'/add_markers',
name='AddMarkers',
description='Add markers to the road network.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsString('Markers', 'Markers', 'JSON markers data as a list', access=hs.HopsParamAccess.LIST, optional=True),
],
outputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
]
)
def component_add_markers(json_network, markers=''):
json_network = json.loads(json_network)
network = N.load_packed_network(json_network)
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
if 'lane_mapping' not in json_network['info']['properties']:
network.generate_lane_mapping()
for marker in markers:
if not marker == '':
marker: dict = json.loads(marker)
if marker['road_index'] >= len(network.roads):
raise Exception('Marker road index out of range')
if marker['type'] == 'spawner_pathfind' or marker['type'] == 'spawner_pathfind' or marker['type'] == 'spawner':
network.add_spawner(
marker['road_index'],
marker.get('lane_indices', [0]),
marker.get('t', 0),
marker.get('spacing', 10),
marker.get('spawns_remaining', 100),
marker.get('target', None),
)
return network.data()
@hops.component(
'/mapping_curves',
name='MappingCrvs',
description='Generate all mapping curves as preview.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
],
outputs=[
hs.HopsString('Curves', 'Crvs', 'Mapping curves'),
]
)
def component_mapping_curves(json_network):
json_network = json.loads(json_network)
network = N.load_packed_network(json_network)
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
if 'lane_mapping' not in json_network['info']['properties']:
network.generate_lane_mapping()
if 'trim' not in json_network['info']['properties']:
network.trim_roads()
network.generate_mapping_curves()
output_curves = []
for node_index, node in enumerate(network.nodes):
oc = []
for crv in node.mapping_curves.values():
oc.append(crv.data())
output_curves.append(oc)
return output_curves
@hops.component(
'/simulation',
name='Simulation',
description='Run a vehicle simulation on a given JSON network.',
category=CATEGORY,
icon=DEFAULT_ICON,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsString('Simulation parameters', 'Parameters', 'JSON file containing the parameters to start with'),
hs.HopsInteger('Seed', 'Seed', 'Seed value for randomness.', optional=True),
],
outputs=[
hs.HopsString('Statistics', 'Stats', 'Overall statistics, JSON data'),
hs.HopsString('Animation', 'Animation', 'Vehicle animation, JSON data'),
hs.HopsString('Analysis', 'Analysis', 'Combination of per-road analyses, JSON data'),
]
)
def component_simulation(json_network, params, seed=0):
N.set_seed(seed)
stats = {}
json_network = json.loads(json_network)
# LOAD PARAMS
parameters = json.loads(params)
duration = parameters.get('duration', 20)
timestep = parameters.get('timestep', 1/20)
save_skip = parameters.get('save_skip', 5)
timeout = parameters.get('timeout', 30)
# LOAD NETWORK
network = N.load_packed_network(json_network)
network.record = True
network.record_duration = duration
if 'connection_cache' not in json_network['info']['properties']:
network.generate_connection_cache()
if 'lane_mapping' not in json_network['info']['properties']:
network.generate_lane_mapping()
if 'trim' not in json_network['info']['properties']:
network.trim_roads()
network.generate_mapping_curves() # does not get cached
network.generate_signalling()
print(network) # info
# SIMULATE
timeout_time = time.time() + min(timeout, 3600) # absolute maximum timeout of 1 hr
total_frames = int(network.record_duration // timestep) # number of simulation frames
for frame_i in range(total_frames):
network.update_markers(timestep)
network.update_vehicles(timestep)
network.analysis_frame(timestep)
if frame_i % save_skip == 0:
network.save_data_frame() # save
network.time += timestep
if time.time() > timeout_time: # timeout
print(time.time(), timeout_time)
stats['timeout'] = f'Maximum time reached, could not complete fully. {frame_i}/{total_frames}'
print('COULD NOT COMPLETE - TIMEOUT')
break # allows for saving
# SAVE
anim = {
'duration_sec':duration,
'simulation_timestep':timestep,
'animation_timestep':timestep*save_skip,
'save_skip':save_skip,
'vehicles':network.get_animation()
}
return stats, anim, network.get_analysis()
@hops.component(
'/pathfind',
name='Pathfind',
description='Find the shortest path from a start road to an end road. If no end is given, default to random walk.',
icon=DEFAULT_ICON,
category=CATEGORY,
inputs=[
hs.HopsString('Network', 'Network', 'JSON network'),
hs.HopsInteger('Start road index', 'Start road', 'Start road index'),
hs.HopsInteger('Start lane index', 'Start lane', 'Start lane index'),
hs.HopsInteger('End road index', 'End road', 'End road index', optional=True),
hs.HopsInteger('End lane index', 'End lane', 'End lane index', optional=True),
hs.HopsInteger('Depth limit', 'Depth limit', 'Depth limit, the number of iterations allowed before failing', optional=True),
],
outputs=[
hs.HopsString('Route', 'Route', 'Route data as JSON'),
]
)
def component_pathfind(json_network, start_road, start_lane, end_road=-1, end_lane=-1, depth_limit=-1):
json_network = json.loads(json_network)
network = N.load_packed_network(json_network)
network.generate_connection_cache()
network.generate_lane_mapping()
if depth_limit < 0:
depth_limit = None
if end_road < 0:
end_road = None
if end_lane < 0:
end_lane = None
route = network.create_vehicle_route((start_road, start_lane), (end_road, end_lane), depth_limit)
return [route]
# http://127.0.0.1:5000
if __name__ == '__main__':
app.run(debug=True)