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Sanitize the maximum number of sessions

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Reduce the maximum number of sessions to permit if running with
a tight rlimit, to avoid hitting open file limits.  Log when
doing so.

Closes #158
This commit is contained in:
Neil Booth 2017-03-25 12:54:35 +09:00
parent f04ff6f5b3
commit e4947cb9ef
1 changed files with 16 additions and 1 deletions
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17
server/env.py
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@ -8,6 +8,7 @@
'''Class for handling environment configuration and defaults.'''
import resource
from collections import namedtuple
from ipaddress import ip_address
from os import environ
@ -60,7 +61,7 @@ class Env(LoggedClass):
# Server limits to help prevent DoS
self.max_send = self.integer('MAX_SEND', 1000000)
self.max_subs = self.integer('MAX_SUBS', 250000)
self.max_sessions = self.integer('MAX_SESSIONS', 1000)
self.max_sessions = self.sane_max_sessions()
self.max_session_subs = self.integer('MAX_SESSION_SUBS', 50000)
self.bandwidth_limit = self.integer('BANDWIDTH_LIMIT', 2000000)
self.session_timeout = self.integer('SESSION_TIMEOUT', 600)
@ -118,6 +119,20 @@ class Env(LoggedClass):
raise self.Error('cannot convert envvar {} value {} to an integer'
.format(envvar, value))
def sane_max_sessions(self):
'''Return the maximum number of sessions to permit. Normally this
is MAX_SESSIONS. However, to prevent open file exhaustion, ajdust
downwards if running with a small open file rlimit.'''
env_value = self.integer('MAX_SESSIONS', 1000)
nofile_limit = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
# We give the DB 250 files; allow ElectrumX 100 for itself
value = max(0, min(env_value, nofile_limit - 350))
if value < env_value:
self.log_warning('lowered maximum seessions from {:,d} to {:,d} '
'because your open file limit is {:,d}'
.format(env_value, value, nofile_limit))
return value
def check_report_host(self, host):
try:
ip = ip_address(host)