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views.py
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"""
PRMS Vegetation Change Modeling API
Date: Feb 25 2016
"""
import datetime
import json
import math
import netCDF4
import os
from flask import jsonify, request, Response
from flask import current_app as app
from urllib import urlretrieve
from uuid import uuid4
from . import api
from ..models import Scenario, Hydrograph, Inputs, Outputs
from util import get_veg_map_by_hru, model_run_name
@api.route('/api/scenarios/<scenario_id>', methods=['GET', 'DELETE'])
def scenario_by_id(scenario_id):
"""
Look up or delete a scenario by its id
"""
if request.method == 'GET':
scenario = Scenario.objects(id=scenario_id).first()
if scenario:
return jsonify(scenario=scenario.to_json())
else:
return Response(
json.dumps(
{'message': 'no scenario id found! ' +
'currently the scenario id must be 1 or 0!'}
), 400, mimetype='application/json'
)
if request.method == 'DELETE':
scenario = Scenario.objects(id=scenario_id).first()
if scenario:
try:
scenario.delete()
return jsonify(
message='scenario with id ' + scenario_id + ' removed!'
)
except:
return Response(
json.dumps(
{'message': 'error deleting scenario ' + scenario_id}
), 400, mimetype='application/json'
)
else:
return Response(
json.dumps(
{'message': 'scenario_id' + scenario_id + 'not found'}
), 400, mimetype='application/json'
)
@api.route('/api/scenarios/finished_modelruns')
def display_modelruns():
temp_list = model_run_name(
auth_host=app.config['AUTH_HOST'],
model_host=app.config['MODEL_HOST'],
app_username=app.config['APP_USERNAME'],
app_password=app.config['APP_PASSWORD']
)
return temp_list
@api.route('/api/scenarios', methods=['GET', 'POST'])
def scenarios():
"""
Handle get and push requests for list of all finished scenarios and submit
a new scenario, respectively.
"""
if request.method == 'GET':
scenarios = Scenario.objects
# this is for the first three scenarios only
if app.config['DEBUG'] and len(scenarios) < 3:
for loop_counter in range(3):
_init_dev_db(app.config['BASE_PARAMETER_NC'], loop_counter)
scenarios = Scenario.objects
return jsonify(scenarios=scenarios)
else:
BASE_PARAMETER_NC = app.config['BASE_PARAMETER_NC']
# assemble parts of a new scenario record
vegmap_json = request.json['veg_map_by_hru']
name = request.json['name']
time_received = datetime.datetime.now()
new_scenario = Scenario(
name=name,
time_received=time_received,
)
scenario_runner = new_scenario.initialize_runner(BASE_PARAMETER_NC)
# using vegmap sent by client, update coverage type variables
scenario_runner.update_cov_type(vegmap_json['bare_ground'], 0)
scenario_runner.update_cov_type(vegmap_json['grasses'], 1)
scenario_runner.update_cov_type(vegmap_json['shrubs'], 2)
scenario_runner.update_cov_type(vegmap_json['trees'], 3)
scenario_runner.update_cov_type(vegmap_json['conifers'], 4)
# commit changes to coverage type in preparation for scenario run
scenario_runner.finalize_run()
# now that changes to scenario_file are committed, we update Scenario
new_scenario.veg_map_by_hru =\
get_veg_map_by_hru(scenario_runner.scenario_file)
new_scenario.save()
modelserver_run = scenario_runner.run(
auth_host=app.config['AUTH_HOST'],
model_host=app.config['MODEL_HOST'],
app_username=app.config['APP_USERNAME'],
app_password=app.config['APP_PASSWORD']
)
time_finished = datetime.datetime.now()
new_scenario.time_finished = time_finished
# extract URLs pointing to input/output resources stored on modelserver
resources = modelserver_run.resources
control =\
filter(lambda x: 'control' == x.resource_type, resources
).pop().resource_url
parameter =\
filter(lambda x: 'param' == x.resource_type, resources
).pop().resource_url
data =\
filter(lambda x: 'data' == x.resource_type, resources
).pop().resource_url
inputs = Inputs(control=control, parameter=parameter, data=data)
new_scenario.inputs = inputs
statsvar =\
filter(lambda x: 'statsvar' == x.resource_type, resources
).pop().resource_url
outputs = Outputs(statsvar=statsvar)
new_scenario.outputs = outputs
# extract hydrograph from the statsvar file and add to Scenario
if not os.path.isdir('.tmp'):
os.mkdir('.tmp')
tmp_statsvar = os.path.join('.tmp', 'statsvar-' + str(uuid4()))
urlretrieve(statsvar, tmp_statsvar)
d = netCDF4.Dataset(tmp_statsvar, 'r')
cfs = d['basin_cfs_1'][:]
t = d.variables['time']
# need to subtract 1...bug in generation of statsvar b/c t starts at 1
dates = netCDF4.num2date(t[:] - 1, t.units)
hydrograph = Hydrograph(time_array=dates, streamflow_array=cfs)
new_scenario.hydrograph = hydrograph
new_scenario.save()
# clean up temporary statsvar netCDF
d.close()
os.remove(tmp_statsvar)
return jsonify(scenario=new_scenario.to_json())
@api.route('/api/base-veg-map', methods=['GET'])
def hru_veg_json():
if request.method == 'GET':
"""generate json file from netcdf file"""
BASE_PARAMETER_NC = app.config['BASE_PARAMETER_NC']
return jsonify(
**json.loads(get_veg_map_by_hru(BASE_PARAMETER_NC).to_json())
)
def _init_dev_db(BASE_PARAMETER_NC, scenario_num=0):
"""
"""
name = 'Demo development scenario ' + str(scenario_num)
time_received = datetime.datetime.now()
updated_veg_map_by_hru = get_veg_map_by_hru(BASE_PARAMETER_NC)
time_finished = datetime.datetime.now()
inputs = Inputs()
outputs = Outputs()
# create two water years of fake data starting from 1 Oct 2010
begin_date = datetime.datetime(2010, 10, 1, 0)
time_array = [begin_date + datetime.timedelta(days=x) for x in
range(365*2)]
# use simple exponentials as the prototype data
x = range(365)
streamflow_array = [
pow(math.e, -pow(((i - 200.0 + 50*scenario_num)/100.0), 2))
for i in x
]
hydrograph = Hydrograph(
time_array=time_array,
streamflow_array=streamflow_array+streamflow_array
)
new_scenario = Scenario(
name=name,
time_received=time_received,
time_finished=time_finished,
veg_map_by_hru=updated_veg_map_by_hru,
inputs=inputs,
outputs=outputs,
hydrograph=hydrograph
)
new_scenario.save()