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  $   	€l–Рzѕ”ji?u4 \ёо*bСїВ„`x_БЕД :к    	# 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 logging
import os
import socket
import time
from urllib.parse import urlparse

import requests
from requests.exceptions import ConnectionError

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

from cloudinit import dmi, performance, sources, url_helper, util
from cloudinit.event import EventScope, EventType
from cloudinit.net.dhcp import NoDHCPLeaseError
from cloudinit.net.ephemeral import EphemeralDHCPv4, EphemeralIPv6Network
from cloudinit.sources import DataSourceHostname
from cloudinit.subp import ProcessExecutionError

LOG = logging.getLogger(__name__)

DS_BASE_URLS = ["http://169.254.42.42", "http://[fd00:42::42]"]

DEF_MD_RETRIES = 3
DEF_MD_MAX_WAIT = 2
DEF_MD_TIMEOUT = 10


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 responsibility 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()
            # Adapt Session.mount to IPv4/IPv6 context
            localhost = "0.0.0.0"
            try:
                u