import logging
from .stanza import Stanza
logger = logging.getLogger(__name__)
[docs]class MetaFrontendStanza(Stanza):
"""
Stanza subclass representing a shared "meta" cluster frontend.
These frontends just contain ACL directives for routing requests to
separate cluster backends. If a member cluster does not have an ACL rule
defined in its haproxy config an error is logged and the member cluster
is skipped.
"""
def __init__(self, name, port, lines, members, bind_address=None):
super(MetaFrontendStanza, self).__init__("frontend")
self.header = "frontend %s" % name
if not bind_address:
bind_address = ""
self.add_line("bind %s:%s" % (bind_address, port))
self.add_lines(lines)
for cluster in members:
if "acl" not in cluster.haproxy:
logger.error(
"Cluster %s is part of meta-cluster %s," +
" but no acl rule defined.",
cluster.name, name
)
continue
self.add_lines([
"acl is_%s %s" % (cluster.name, cluster.haproxy["acl"]),
"use_backend %s if is_%s" % (cluster.name, cluster.name)
])