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# Author: Julien Castets <castets.j@gmail.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

# Scaleway API:
# https://developer.scaleway.com/#metadata

import json
import os
import socket
import time

import requests

# Note: `urllib3` is transitively installed by `requests`
from urllib3.connection import HTTPConnection
from urllib3.poolmanager import PoolManager

from cloudinit import dmi
from cloudinit import log as logging
from cloudinit import net, sources, url_helper, util
from cloudinit.event import EventScope, EventType
from cloudinit.net.dhcp import NoDHCPLeaseError
from cloudinit.net.ephemeral import EphemeralDHCPv4
from cloudinit.sources import DataSourceHostname

LOG = logging.getLogger(__name__)

DS_BASE_URL = "http://169.254.42.42"

BUILTIN_DS_CONFIG = {
    "metadata_url": DS_BASE_URL + "/conf?format=json",
    "userdata_url": DS_BASE_URL + "/user_data/cloud-init",
    "vendordata_url": DS_BASE_URL + "/vendor_data/cloud-init",
}

DEF_MD_RETRIES = 5
DEF_MD_TIMEOUT = 10


def on_scaleway():
    """
    There are three ways to detect if you are on Scaleway:

    * check DMI data: not yet implemented by Scaleway, but the check is made to
      be future-proof.
    * the initrd created the file /var/run/scaleway.
    * "scaleway" is in the kernel cmdline.
    """
    vendor_name = dmi.read_dmi_data("system-manufacturer")
    if vendor_name == "Scaleway":
        return True

    if os.path.exists("/var/run/scaleway"):
        return True

    cmdline = util.get_cmdline()
    if "scaleway" in cmdline:
        return True

    return False


class SourceAddressAdapter(requests.adapters.HTTPAdapter):
    """
    Adapter for requests to choose the local address to bind to.
    """

    def __init__(self, source_address, **kwargs):
        self.source_address = source_address
        super(SourceAddressAdapter, self).__init__(**kwargs)

    def init_poolmanager(self, connections, maxsize, block=False):
        socket_options = HTTPConnection.default_socket_options + [
            (socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        ]
        self.poolmanager = PoolManager(
            num_pools=connections,
            maxsize=maxsize,
            block=block,
            source_address=self.source_address,
            socket_options=socket_options,
        )


def query_data_api_once(api_address, timeout, requests_session):
    """
    Retrieve user data or vendor data.

    Scaleway user/vendor data API returns HTTP/404 if user/vendor data is not
    set.

    This function calls `url_helper.readurl` but instead of considering
    HTTP/404 as an error that requires a retry, it considers it as empty
    user/vendor data.

    Also, be aware the user data/vendor API requires the source port to be
    below 1024 to ensure the client is root (since non-root users can't bind
    ports below 1024). If requests raises ConnectionError (EADDRINUSE), the
    caller should retry to call this function on an other port.
    """
    try:
        resp = url_helper.readurl(
            api_address,
            data=None,
            timeout=timeout,
            # It's the caller's responsability to recall this function in case
            # of exception. Don't let url_helper.readurl() retry by itself.
            retries=0,
            session=requests_session,
            # If the error is a HTTP/404 or a ConnectionError, go into raise
            # block below and don't bother retrying.
            exception_cb=lambda _, exc: exc.code != 404
            and (
                not isinstance(exc.cause, requests.exceptions.ConnectionError)
            ),
        )
        return util.decode_binary(resp.contents)
    except url_helper.UrlError as exc:
        # Empty user data.
        if exc.code == 404:
            return None
        raise


def query_data_api(api_type, api_address, retries, timeout):
    """Get user or vendor data.

    Handle the retrying logic in case the source port is used.

    Scaleway metadata service requires the source port of the client to
    be a privileged port (<1024).  This is done to ensure that only a
    privileged user on the system can access the metadata service.
    """
    # Query user/vendor data. Try to make a request on the first privileged
    # port available.
    for port in range(1, max(retries, 2)):
        try:
            LOG.debug(
                "Trying to get %s data (bind on port %d)...", api_type, port
            )
            requests_session = requests.Session()
            requests_session.mount(
                "http://",
                SourceAddressAdapter(source_address=("0.0.0.0", port)),
            )
            data = query_data_api_once(
                api_address, timeout=timeout, requests_session=requests_session
            )
            LOG.debug("%s-data downloaded", api_type)
            return data

        except url_helper.UrlError as exc:
            # Local port already in use or HTTP/429.
            LOG.warning("Error while trying to get %s data: %s", api_type, exc)
            time.sleep(5)
            last_exc = exc
            continue

    # Max number of retries reached.
    raise last_exc


class DataSourceScaleway(sources.DataSource):
    dsname = "Scaleway"
    default_update_events = {
        EventScope.NETWORK: {
            EventType.BOOT_NEW_INSTANCE,
            EventType.BOOT,
            EventType.BOOT_LEGACY,
        }
    }

    def __init__(self, sys_cfg, distro, paths):
        super(DataSourceScaleway, self).__init__(sys_cfg, distro, paths)

        self.ds_cfg = util.mergemanydict(
            [
                util.get_cfg_by_path(sys_cfg, ["datasource", "Scaleway"], {}),
                BUILTIN_DS_CONFIG,
            ]
        )

        self.metadata_address = self.ds_cfg["metadata_url"]
        self.userdata_address = self.ds_cfg["userdata_url"]
        self.vendordata_address = self.ds_cfg["vendordata_url"]

        self.retries = int(self.ds_cfg.get("retries", DEF_MD_RETRIES))
        self.timeout = int(self.ds_cfg.get("timeout", DEF_MD_TIMEOUT))
        self._fallback_interface = None
        self._network_config = sources.UNSET

    def _crawl_metadata(self):
        resp = url_helper.readurl(
            self.metadata_address, timeout=self.timeout, retries=self.retries
        )
        self.metadata = json.loads(util.decode_binary(resp.contents))

        self.userdata_raw = query_data_api(
            "user-data", self.userdata_address, self.retries, self.timeout
        )
        self.vendordata_raw = query_data_api(
            "vendor-data", self.vendordata_address, self.retries, self.timeout
        )

    def _get_data(self):
        if not on_scaleway():
            return False

        if self._fallback_interface is None:
            self._fallback_interface = net.find_fallback_nic()
        try:
            with EphemeralDHCPv4(
                self._fallback_interface,
                tmp_dir=self.distro.get_tmp_exec_path(),
            ):
                util.log_time(
                    logfunc=LOG.debug,
                    msg="Crawl of metadata service",
                    func=self._crawl_metadata,
                )
        except (NoDHCPLeaseError) as e:
            util.logexc(LOG, str(e))
            return False
        return True

    @property
    def network_config(self):
        """
        Configure networking according to data received from the
        metadata API.
        """
        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 self._fallback_interface is None:
            self._fallback_interface = net.find_fallback_nic()

        netcfg = {"type": "physical", "name": "%s" % self._fallback_interface}
        subnets = [{"type": "dhcp4"}]
        if self.metadata["ipv6"]:
            subnets += [
                {
                    "type": "static",
                    "address": "%s" % self.metadata["ipv6"]["address"],
                    "netmask": "%s" % self.metadata["ipv6"]["netmask"],
                    "routes": [
                        {
                            "network": "::",
                            "prefix": "0",
                            "gateway": "%s" % self.metadata["ipv6"]["gateway"],
                        }
                    ],
                }
            ]
        netcfg["subnets"] = subnets
        self._network_config = {"version": 1, "config": [netcfg]}
        return self._network_config

    @property
    def launch_index(self):
        return None

    def get_instance_id(self):
        return self.metadata["id"]

    def get_public_ssh_keys(self):
        ssh_keys = [key["key"] for key in self.metadata["ssh_public_keys"]]

        akeypre = "AUTHORIZED_KEY="
        plen = len(akeypre)
        for tag in self.metadata.get("tags", []):
            if not tag.startswith(akeypre):
                continue
            ssh_keys.append(tag[:plen].replace("_", " "))

        return ssh_keys

    def get_hostname(self, fqdn=False, resolve_ip=False, metadata_only=False):
        return DataSourceHostname(self.metadata["hostname"], False)

    @property
    def availability_zone(self):
        return None

    @property
    def region(self):
        return None


datasources = [
    (DataSourceScaleway, (sources.DEP_FILESYSTEM,)),
]


def get_datasource_list(depends):
    return sources.list_from_depends(depends, datasources)

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
azure Folder 0755
helpers Folder 0755
DataSourceAliYun.py File 2.17 KB 0644
DataSourceAltCloud.py File 8.29 KB 0644
DataSourceAzure.py File 68.68 KB 0644
DataSourceBigstep.py File 1.92 KB 0644
DataSourceCloudSigma.py File 4 KB 0644
DataSourceCloudStack.py File 9.85 KB 0644
DataSourceConfigDrive.py File 11.01 KB 0644
DataSourceDigitalOcean.py File 3.81 KB 0644
DataSourceEc2.py File 35.81 KB 0644
DataSourceExoscale.py File 8.89 KB 0644
DataSourceGCE.py File 11.96 KB 0644
DataSourceHetzner.py File 5.41 KB 0644
DataSourceIBMCloud.py File 14.05 KB 0644
DataSourceLXD.py File 17.19 KB 0644
DataSourceMAAS.py File 14.39 KB 0644
DataSourceNWCS.py File 4.66 KB 0644
DataSourceNoCloud.py File 12.38 KB 0644
DataSourceNone.py File 1.36 KB 0644
DataSourceOVF.py File 10.47 KB 0644
DataSourceOpenNebula.py File 15.98 KB 0644
DataSourceOpenStack.py File 10.46 KB 0644
DataSourceOracle.py File 14.72 KB 0644
DataSourceRbxCloud.py File 7.83 KB 0644
DataSourceScaleway.py File 9.47 KB 0644
DataSourceSmartOS.py File 34.09 KB 0644
DataSourceUpCloud.py File 5.55 KB 0644
DataSourceVMware.py File 32.7 KB 0644
DataSourceVultr.py File 4.18 KB 0644
__init__.py File 40.79 KB 0644