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import abc
import json
from urllib import error
from posixpath import join as urljoin
from uaclient import config
from uaclient import util
from uaclient import version
try:
from typing import Optional, Type # noqa
except ImportError:
# typing isn't available on trusty, so ignore its absence
pass
class UAServiceClient(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def api_error_cls(self) -> "Type[Exception]":
"""Set in subclasses to the type of API error raised"""
pass
@property
@abc.abstractmethod
def cfg_url_base_attr(self) -> str:
"""String in subclasses, the UAConfig attribute containing base url"""
pass
def __init__(self, cfg: "Optional[config.UAConfig]" = None) -> None:
if not cfg:
self.cfg = config.UAConfig()
else:
self.cfg = cfg
def headers(self):
return {
"user-agent": "UA-Client/{}".format(version.get_version()),
"accept": "application/json",
"content-type": "application/json",
}
def request_url(self, path, data=None, headers=None, method=None):
path = path.lstrip("/")
if not headers:
headers = self.headers()
if headers.get("content-type") == "application/json" and data:
data = json.dumps(data).encode("utf-8")
url = urljoin(getattr(self.cfg, self.cfg_url_base_attr), path)
try:
response, headers = util.readurl(
url=url, data=data, headers=headers, method=method
)
except error.URLError as e:
if hasattr(e, "read"):
try:
error_details = json.loads(e.read().decode("utf-8"))
except ValueError:
error_details = None
if error_details:
raise self.api_error_cls(e, error_details)
raise util.UrlError(
e, code=getattr(e, "code", None), headers=headers, url=url
)
return response, headers