def get_graph_json(request):
cache = get_cache('fat')
key = 'path_graph_json'
result = cache.get(key)
latest = Path.latest_updated()
if result and latest:
cache_latest, json_graph = result
# Not empty and still valid
if cache_latest and cache_latest >= latest:
return HttpJSONResponse(json_graph)
# cache does not exist or is not up to date
# rebuild the graph and cache the json
def path_modifier(path):
l = 0.0 if math.isnan(path.length) else path.length
return {"id": path.pk, "length": l}
graph = graph_lib.graph_edges_nodes_of_qs(
Path.objects.all(),
value_modifier=path_modifier,
key_modifier=graph_lib.get_key_optimizer())
json_graph = json.dumps(graph)
cache.set(key, (latest, json_graph))
return HttpJSONResponse(json_graph)
def merge_path(request):
"""
Path merging view
"""
response = {}
if request.method == 'POST':
ids_path_merge = request.POST.getlist('path[]')
assert len(ids_path_merge) == 2
path_a = Path.objects.get(pk=ids_path_merge[0])
path_b = Path.objects.get(pk=ids_path_merge[1])
if not path_a.same_structure(
request.user) or not path_b.same_structure(request.user):
response = {
'error': _(u"You don't have the right to change these paths")
}
return HttpJSONResponse(response)
try:
result = path_a.merge_path(path_b)
except Exception as exc:
response = {
'error': exc,
}
return HttpJSONResponse(response)
if result == 2:
response = {
'error':
_(u"You can't merge 2 paths with a 3rd path in the intersection"
)
}
elif result == 0:
response = {'error': _(u"No matching points to merge paths found")}
else:
response = {'success': _(u"Paths merged successfully")}
messages.success(request, _(u"Paths merged successfully"))
return HttpJSONResponse(response)
def get_graph_json(request):
cache = caches['fat']
key = 'path_graph_json'
result = cache.get(key)
latest = Path.latest_updated()
if result and latest:
cache_latest, json_graph = result
# Not empty and still valid
if cache_latest and cache_latest >= latest:
return HttpJSONResponse(json_graph)
# cache does not exist or is not up to date
# rebuild the graph and cache the json
graph = graph_lib.graph_edges_nodes_of_qs(Path.objects.exclude(draft=True))
json_graph = json.dumps(graph)
cache.set(key, (latest, json_graph))
return HttpJSONResponse(json_graph)