def handler_dic(self):
"""View function to be called from template. Loads and queries coin handlers for health, with caching."""
hdic = {
} # A dictionary of {handler_name: {headings:list, results:list[tuple/list]}
reload_handlers()
for coin in Coin.objects.all():
try:
if not has_manager(coin.symbol):
self.coin_fails.append(
'Cannot check {} (no manager registered in coin handlers)'
.format(coin))
continue
# Try to load coin health data from cache.
# If it's not found, query the manager and cache it for up to 30 seconds to avoid constant RPC hits.
c_health = coin.symbol + '_health'
mname, mhead, mres = cache.get_or_set(
c_health,
get_manager(coin.symbol).health(), 30)
# Create the dict keys for the manager name if needed, then add the health results
d = hdic[mname] = dict(
headings=list(mhead),
results=[]) if mname not in hdic else hdic[mname]
d['results'].append(list(mres))
except:
log.exception(
'Something went wrong loading health data for coin %s',
coin)
self.coin_fails.append(
'Failed checking {} (something went wrong loading health data, check server logs)'
.format(coin))
return hdic
def get(self, request, *args, **kwargs):
r = self.request
u = r.user
if not u.is_authenticated or not u.is_superuser:
raise PermissionDenied
reload_handlers()
return super(AddCoinPairView, self).get(request, *args, **kwargs)
def save(self, *args, **kwargs):
"""To avoid inconsistency, the symbol is automatically made uppercase"""
self.symbol = self.symbol.upper()
super(Coin, self).save(*args, **kwargs)
# After a coin is updated in the DB, we should reload any coin_handlers to detect compatible loaders.
# We need to use in-line loading to prevent recursive loading from the coin handlers causing issues.
from payments.coin_handlers import reload_handlers
reload_handlers()
def get_fieldsets(self, request, obj=None):
# To ensure that the Coin Type dropdown is properly populated, we call reload_handlers() just before
# the create / update Coin page finishes loading it's data.
reload_handlers()
return super(CoinAdmin, self).get_fieldsets(request, obj)