Page MenuHomeDevCentral
Files F3770120

node.py
No OneTemporary
Actions

node.py
View Options

# -*- coding: utf-8 -*-
# -------------------------------------------------------------
# Salt — Node execution module
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Project: Nasqueron
# Created: 2017-10-21
# Description: Functions related to the nodes' pillar entry
# License: BSD-2-Clause
# -------------------------------------------------------------
from salt.exceptions import CommandExecutionError, SaltCloudConfigError
from salt._compat import ipaddress
def _get_all_nodes():
return __pillar__.get("nodes", {})
def get_all_properties(nodename=None):
"""
A function to get a node pillar configuration.
CLI Example:
salt * node.get_all_properties
"""
if nodename is None:
nodename = __grains__["id"]
all_nodes = _get_all_nodes()
if nodename not in all_nodes:
raise CommandExecutionError(
SaltCloudConfigError("Node {0} not declared in pillar.".format(nodename))
)
return all_nodes[nodename]
def get(key, nodename=None):
"""
A function to get a node pillar configuration key.
CLI Example:
salt * node.get hostname
"""
return _get_property(key, nodename, None)
def _explode_key(k):
return k.split(":")
def _get_first_key(k):
return _explode_key(k)[0]
def _strip_first_key(k):
return ":".join(_explode_key(k)[1:])
def _get_property(key, nodename, default_value, parent=None):
if parent is None:
parent = get_all_properties(nodename)
if ":" in key:
first_key = _get_first_key(key)
if first_key in parent:
return _get_property(
_strip_first_key(key), nodename, default_value, parent[first_key]
)
elif key in parent:
return parent[key]
return default_value
def get_list(key, nodename=None):
"""
A function to get a node pillar configuration.
Returns a list if found, or an empty list if not found.
CLI Example:
salt * node.list network:ipv4_aliases
"""
return _get_property(key, nodename, [])
def has(key, nodename=None):
"""
A function to get a node pillar configuration.
Returns a boolean, False if not found.
CLI Example:
salt * node.has network:ipv6_tunnel
"""
value = _get_property(key, nodename, False)
return bool(value)
def has_role(role, nodename=None):
"""
A function to determine if a node has the specified role.
Returns a boolean, False if not found.
CLI Example:
salt * node.has_role devserver
"""
return role in get_list("roles", nodename)
def filter_by_role(pillar_key, nodename=None):
"""
A function to filter a dictionary by roles.
The dictionary must respect the following structure:
- keys are role to check the current node against
- values are list of items
If a key '*' is also present, it will be included
for every role.
Returns a list, extending all the filtered lists.
CLI Example:
salt * node.filter_by_role web_content_sls
"""
roles = get_list("roles", nodename)
dictionary = __pillar__.get(pillar_key, {})
filtered_list = []
for role, items in dictionary.items():
if role == "*" or role in roles:
filtered_list.extend(items)
return filtered_list
def filter_by_name(pillar_key, nodename=None):
"""
A function to filter a dictionary by node name.
The dictionary must respect the following structure:
- keys are names to check the current node against
- values are list of items
If a key '*' is also present, it will be included
for every node.
Returns a list, extending all the filtered lists.
CLI Example:
salt * node.filter_by_name mars
"""
if nodename is None:
nodename = __grains__["id"]
dictionary = __pillar__.get(pillar_key, {})
filtered_list = []
for name, items in dictionary.items():
if name == "*" or name == nodename:
filtered_list.extend(items)
return filtered_list
def has_web_content(content, nodename=None):
return content in filter_by_role("web_content_sls", nodename)
def get_wwwroot(nodename=None):
"""
A function to determine the wwwroot folder to use.
Returns a string depending on the FQDN.
CLI Example:
salt * node.get_wwwroot
"""
hostname = _get_property("hostname", nodename, None)
if hostname is None:
raise CommandExecutionError(
SaltCloudConfigError(
"Node {0} doesn't have a hostname property".format(nodename)
)
)
if hostname.count(".") < 2:
return "wwwroot/{0}/www".format(hostname)
fqdn = hostname.split(".")
return "wwwroot/{1}/{0}".format(".".join(fqdn[0:-2]), ".".join(fqdn[-2:]))
def get_ipv6_list():
"""
A function to get a list of IPv6, enclosed by [].
Returns a string depending on the IPv6 currently assigned.
CLI Example:
salt * node.get_ipv6_list
"""
ipv6 = __grains__.get("ipv6")
return " ".join(["[" + ip + "]" for ip in ipv6])
def resolve_network():
"""
A function to determine canonical properties of networks
from the nodes pillar.
CLI Example:
salt * node.resolve_network
"""
network = {
"ipv4_address": "",
"ipv4_gateway": "",
}
private_network = network.copy()
is_private_network_stable = True
interfaces = _get_property("network:interfaces", __grains__["id"], {})
for interface_name, interface in interfaces.items():
if "ipv4" not in interface:
continue
ipv4 = interface["ipv4"]["address"]
if ipaddress.ip_address(ipv4).is_private:
target = private_network
else:
target = network
if target["ipv4_address"] != "":
continue
target["ipv4_address"] = ipv4
try:
target["ipv4_gateway"] = interface["ipv4"]["gateway"]
except KeyError:
pass
if network["ipv4_address"] == "":
main_network = private_network
else:
main_network = network
if private_network["ipv4_address"] == "":
is_private_network_stable = False
tunnels = resolve_gre_tunnels()
if tunnels:
tunnel = tunnels[0]
private_network = {
"ipv4_address": tunnel["src"],
"ipv4_gateway": tunnel["gateway"],
}
return main_network | {
"private_ipv4_address": private_network["ipv4_address"],
"private_ipv4_gateway": private_network["ipv4_gateway"],
"is_private_network_stable": is_private_network_stable,
}
def _resolve_gre_tunnels_for_router(network, netmask):
tunnels = []
for node, tunnel in __pillar__.get(f"{network}_gre_tunnels", {}).items():
tunnels.append(
{
"network": network,
"description": f"{network}_to_{node}",
"interface": tunnel["router"]["interface"],
"src": tunnel["router"]["addr"],
"dst": tunnel["node"]["addr"],
"netmask": netmask,
"icann_src": get("network")["canonical_public_ipv4"],
"icann_dst": get("network", node)["canonical_public_ipv4"],
}
)
return tunnels
def resolve_gre_tunnels():
"""
A function to get the GRE tunnels for a node
CLI Example:
salt * node.resolve_gre_tunnels
"""
gre_tunnels = []
for network, network_args in __pillar__.get("networks", {}).items():
if __grains__["id"] == network_args["router"]:
gre_tunnels += _resolve_gre_tunnels_for_router(
network, network_args["netmask"]
)
continue
tunnel = __salt__["pillar.get"](f"{network}_gre_tunnels:{__grains__['id']}")
if not tunnel:
continue
gre_tunnels.append(
{
"network": network,
"description": f"{network}_via_{network_args['router']}",
"interface": tunnel["node"].get("interface", "gre0"),
"src": tunnel["node"]["addr"],
"dst": tunnel["router"]["addr"],
"netmask": network_args["netmask"],
"gateway": network_args["default_gateway"],
"icann_src": get("network")["canonical_public_ipv4"],
"icann_dst": get("network", network_args["router"])[
"canonical_public_ipv4"
],
}
)
return gre_tunnels
def get_gateway(network):
# For tunnels, gateway is the tunnel endpoint
tunnel = __salt__["pillar.get"](f"{network}_gre_tunnels:{__grains__['id']}")
if tunnel:
return tunnel["router"]["addr"]
return __salt__["pillar.get"](f"networks:{network}:default_gateway")
def _get_static_route(cidr, gateway):
if __grains__["os_family"] == "FreeBSD":
return f"-net {cidr} {gateway}"
if __grains__["kernel"] == "Linux":
return f"{cidr} via {gateway}"
raise ValueError("No static route implementation for " + __grains__["os_family"])
def _get_default_route(gateway):
if __grains__["os_family"] == "FreeBSD":
return f"default {gateway}"
if __grains__["kernel"] == "Linux":
return f"default via {gateway}"
raise ValueError("No static route implementation for " + __grains__["os_family"])
def _get_interface_route(ip, interface):
if __grains__["os_family"] == "FreeBSD":
return f"-net {ip}/32 -interface {interface}"
if __grains__["kernel"] == "Linux":
return f"{ip} dev {interface}"
raise ValueError("No static route implementation for " + __grains__["os_family"])
def _get_routes_for_private_networks():
"""
Every node, excepted the routeur, should have a route
for the private network CIDR to the router.
For GRE tunnels, the gateway is the tunnel endpoint.
In other cases, the gateway is the main router (private) IP.
"""
routes = {}
for network, network_args in __pillar__.get("networks", {}).items():
if network_args["router"] == __grains__["id"]:
continue
gateway = get_gateway(network)
routes[f"private_{network}"] = _get_static_route(network_args["cidr"], gateway)
return routes
def get_routes():
routes = {}
interfaces = _get_property("network:interfaces", __grains__["id"], {})
for interface_name, interface in interfaces.items():
flags = interface.get("flags", [])
if "gateway" in interface.get("ipv4", {}):
gateway = interface["ipv4"]["gateway"]
if "ipv4_ovh_failover" in flags:
routes[f"{interface_name}_gateway"] = _get_interface_route(
gateway, interface["device"]
)
if __grains__["os_family"] != "RedHat":
# On RHEL/CentOS/Rocky, legacy network scripts take care of this with GATEWAY=
routes[f"{interface_name}_default"] = _get_default_route(gateway)
routes.update(_get_routes_for_private_networks())
return routes

File Metadata

Mime Type
text/x-python
Expires
Mon, Nov 25, 19:06 (8 h, 33 m)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
2260804
Default Alt Text
node.py (11 KB)

Event Timeline

Nasqueron DevCentral · If it had been much bigger the moon would have had a core of ice. · Powered by Phabricator