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api.py
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import platform
import urllib.parse
import requests
from requests.adapters import HTTPAdapter, Response, Retry
from ._version import __package_name__, __version__
from .exceptions import ExceptionMap, ScaleException
SCALE_API_BASE_URL_V1 = "https://api.scale.com/v1"
# Parameters for HTTP retry
HTTP_TOTAL_RETRIES = 3 # Number of total retries
HTTP_RETRY_BACKOFF_FACTOR = 2 # Wait 1, 2, 4 seconds between retries
HTTP_STATUS_FORCE_LIST = [408, 429] + list(range(500, 531))
HTTP_RETRY_ALLOWED_METHODS = frozenset({"GET", "POST", "DELETE"})
class Api:
"""Internal Api reference for handling http operations"""
def __init__(
self,
api_key,
user_agent_extension=None,
api_instance_url=None,
verify=None,
proxies=None,
cert=None,
):
if api_key == "" or api_key is None:
raise ScaleException("Please provide a valid API Key.")
self.api_key = api_key
self._auth = (self.api_key, "")
self._headers = {
"Content-Type": "application/json",
"User-Agent": self._generate_useragent(user_agent_extension),
}
self._headers_multipart_form_data = {
"User-Agent": self._generate_useragent(user_agent_extension),
}
self.base_api_url = api_instance_url or SCALE_API_BASE_URL_V1
self.verify = verify
self.proxies = proxies
self.cert = cert
@staticmethod
def _http_request(
method,
url,
headers=None,
auth=None,
params=None,
body=None,
files=None,
data=None,
verify=None,
proxies=None,
cert=None,
) -> Response:
https = requests.Session()
retry_strategy = Retry(
total=HTTP_TOTAL_RETRIES,
backoff_factor=HTTP_RETRY_BACKOFF_FACTOR,
status_forcelist=HTTP_STATUS_FORCE_LIST,
allowed_methods=HTTP_RETRY_ALLOWED_METHODS,
raise_on_status=False,
)
adapter = HTTPAdapter(max_retries=retry_strategy)
https.mount("https://", adapter)
https.cert = cert if cert else None
https.verify = verify if verify else True
if proxies:
https.proxies.update(proxies)
try:
params = params or {}
body = body or None
res = https.request(
method=method,
url=url,
headers=headers,
auth=auth,
params=params,
json=body,
files=files,
data=data,
)
return res
except Exception as err:
raise ScaleException(err) from err
@staticmethod
def _raise_on_respose(res: Response):
try:
message = res.json().get("error", res.text)
except ValueError:
message = res.text
exception = ExceptionMap.get(res.status_code, ScaleException)
raise exception(message, res.status_code)
def _api_request(
self,
method,
endpoint,
headers=None,
auth=None,
params=None,
body=None,
files=None,
data=None,
):
"""Generic HTTP request method with error handling."""
url = f"{self.base_api_url}/{endpoint}"
res = self._http_request(
method,
url,
headers,
auth,
params,
body,
files,
data,
verify=self.verify,
proxies=self.proxies,
cert=self.cert,
)
json = None
if res.status_code == 200:
try:
json = res.json()
except ValueError:
# Some endpoints only return 'OK' message without JSON
return json
elif res.status_code == 409 and "task" in endpoint and body.get("unique_id"):
try:
retry_history = res.raw.retries.history
except AttributeError:
retry_history = []
# Example RequestHistory tuple
# RequestHistory(method='POST',
# url='/v1/task/imageannotation',
# error=None,
# status=409,
# redirect_location=None)
if retry_history and retry_history[0][3] >= 500:
uuid = body["unique_id"]
new_url = f"{self.base_api_url}/tasks?unique_id={uuid}"
# Perform a GET request to retrieve task data
new_res = self._http_request("GET", new_url, headers=headers, auth=auth)
if new_res.status_code == 200:
new_res_data = new_res.json()
if new_res_data["docs"]:
json = new_res_data["docs"][0]
else:
self._raise_on_respose(new_res)
else:
self._raise_on_respose(new_res)
else:
self._raise_on_respose(res)
else:
self._raise_on_respose(res)
return json
def get_request(self, endpoint, params=None):
"""Generic GET Request Wrapper"""
return self._api_request(
"GET", endpoint, headers=self._headers, auth=self._auth, params=params
)
def post_request(self, endpoint, body=None, files=None, data=None):
"""Generic POST Request Wrapper"""
return self._api_request(
"POST",
endpoint,
headers=(
self._headers if files is None else self._headers_multipart_form_data
),
auth=self._auth,
body=body,
files=files,
data=data,
)
def delete_request(self, endpoint, params=None, body=None):
"""Generic DELETE Request Wrapper"""
return self._api_request(
"DELETE",
endpoint,
headers=self._headers,
auth=self._auth,
params=params,
body=body,
)
def put_request(self, endpoint, body=None, params=None):
"""Generic PUT Request Wrapper"""
return self._api_request(
"PUT",
endpoint,
body=body,
headers=self._headers,
auth=self._auth,
params=params,
)
@staticmethod
def _generate_useragent(extension: str = None) -> str:
"""Generates UserAgent parameter with module, Python
and OS details
Args:
extension (str, optional): Option to extend UserAgent
with source system
Returns:
str: Generated UserAgent parameter with platform versions
"""
python_version = platform.python_version()
os_platform = platform.platform()
user_agent = " ".join(
filter(
None,
[
f"{__package_name__}/{__version__}",
f"Python/{python_version}",
f"OS/{os_platform}",
extension,
],
)
)
return user_agent
@staticmethod
def quote_string(text: str) -> str:
"""Project and Batch names can be a part of URL, which causes
an error in case of a special character used.
Quotation assures the right object to be retrieved from API.
`quote_string('a bc/def')` -> `a%20bc%2Fdef`
Args:
text (str): Input text to be quoted
Returns:
str: Quoted text in return
"""
return urllib.parse.quote(text, safe="")