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# This file is part of cloud-init. See LICENSE file for license information.
from requests import exceptions
from cloudinit import dmi
from cloudinit import log as logging
from cloudinit import net, sources, subp, url_helper, util
from cloudinit.net.dhcp import NoDHCPLeaseError
from cloudinit.net.ephemeral import EphemeralDHCPv4
LOG = logging.getLogger(__name__)
BASE_URL_V1 = "http://169.254.169.254/api/v1"
BUILTIN_DS_CONFIG = {
"metadata_url": BASE_URL_V1 + "/metadata",
}
MD_RETRIES = 30
MD_TIMEOUT = 5
MD_WAIT_RETRY = 5
class DataSourceNWCS(sources.DataSource):
dsname = "NWCS"
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.distro = distro
self.metadata = dict()
self.ds_cfg = util.mergemanydict(
[
util.get_cfg_by_path(sys_cfg, ["datasource", "NWCS"], {}),
BUILTIN_DS_CONFIG,
]
)
self.metadata_address = self.ds_cfg["metadata_url"]
self.retries = self.ds_cfg.get("retries", MD_RETRIES)
self.timeout = self.ds_cfg.get("timeout", MD_TIMEOUT)
self.wait_retry = self.ds_cfg.get("wait_retry", MD_WAIT_RETRY)
self._network_config = sources.UNSET
self.dsmode = sources.DSMODE_NETWORK
def _get_data(self):
LOG.info("Detecting if machine is a NWCS instance")
on_nwcs = get_nwcs_data()
if not on_nwcs:
LOG.info("Machine is not a NWCS instance")
return False
LOG.info("Machine is a NWCS instance")
md = self.get_metadata()
if md is None:
raise Exception("failed to get metadata")
self.metadata_full = md
self.metadata["instance-id"] = md["instance-id"]
self.metadata["public-keys"] = md["public-keys"]
self.metadata["network"] = md["network"]
self.metadata["local-hostname"] = md["hostname"]
self.userdata_raw = md.get("userdata", None)
self.vendordata_raw = md.get("vendordata", None)
return True
def get_metadata(self):
try:
LOG.info("Attempting to get metadata via DHCP")
with EphemeralDHCPv4(
iface=net.find_fallback_nic(),
connectivity_url_data={
"url": BASE_URL_V1 + "/metadata/instance-id",
},
):
return read_metadata(
self.metadata_address,
timeout=self.timeout,
sec_between=self.wait_retry,
retries=self.retries,
)
except (
NoDHCPLeaseError,
subp.ProcessExecutionError,
RuntimeError,
exceptions.RequestException,
) as e:
LOG.error("DHCP failure: %s", e)
raise
@property
def network_config(self):
LOG.debug("Attempting network configuration")
if self._network_config is None:
LOG.warning(
"Found None as cached _network_config, resetting to %s",
sources.UNSET,
)
self._network_config = sources.UNSET
if self._network_config != sources.UNSET:
return self._network_config
if not self.metadata["network"]["config"]:
raise Exception("Unable to get metadata from server")
# metadata sends interface names, but we dont want to use them
for i in self.metadata["network"]["config"]:
iface_name = get_interface_name(i["mac_address"])
if iface_name:
LOG.info("Overriding %s with %s", i["name"], iface_name)
i["name"] = iface_name
self._network_config = self.metadata["network"]
return self._network_config
def get_nwcs_data():
vendor_name = dmi.read_dmi_data("system-manufacturer")
if vendor_name != "NWCS":
return False
return True
def get_interface_name(mac):
macs_to_nic = net.get_interfaces_by_mac()
if mac not in macs_to_nic:
return None
return macs_to_nic.get(mac)
# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return sources.list_from_depends(depends, datasources)
def read_metadata(url, timeout=2, sec_between=2, retries=30):
response = url_helper.readurl(
url, timeout=timeout, sec_between=sec_between, retries=retries
)
if not response.ok():
raise RuntimeError("unable to read metadata at %s" % url)
return util.load_json(response.contents.decode())
# Used to match classes to dependencies
datasources = [
(DataSourceNWCS, (sources.DEP_FILESYSTEM,)),
]
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