Catching 502 error (#19)

* Catching 502 response from server

* Updated all dependencies.

* Updated lxml to 4.6.3 to resolve security issues.

.github/workflows/codestyle.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           python-version: "3.9"
       - name: Cache pip
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}

.github/workflows/publish.yml

@@ -19,15 +19,13 @@ jobs:
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
-      - name: Print Github refs
-        run: echo ${{github.ref}}
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
       - name: Cache pip
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
@@ -51,7 +49,7 @@ jobs:
         with:
           python-version: 3.9
       - name: Cache pip
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}

codeforces_api/api_request_maker.py

@@ -23,8 +23,8 @@
 
 class CodeforcesApiRequestMaker:
 
-    _api_key = ""
-    _secret = ""
+    _api_key = None
+    _secret = None
     _rand = 0
     assigned_rand = False
     anonimus = False
@@ -55,11 +55,8 @@ def generate_request(self, method_name, **fields):
         """
         Generates request URL and data for API.
         """
-
         request_url = "https://codeforces.com/api/" + str(method_name)
-
         if not self.anonimus:
-
             # Renew Rand
             if not self.assigned_rand:
                 self.renew_rand()

codeforces_api/api_requests.py

@@ -50,6 +50,8 @@ def _make_request(self, method, **payload):
         request = self.session.request(
             self.method, request_data["request_url"], data=request_data["data"]
         )
+        if request.status_code == 502:
+            raise SystemError("Codeforces is unavailable now.")
         return self.get_response(request)
 
     def __init__(self, api_key=None, secret=None, random_number=1000000, method="POST"):

codeforces_api/version.py

@@ -1 +1 @@
-__version__ = "2.0.7"
+__version__ = "2.0.8"

requirements.txt

@@ -14,8 +14,8 @@ importlib-metadata==3.7.3
 iniconfig==1.1.1
 isort==5.8.0
 keyring==23.0.0
-lazy-object-proxy==1.5.2
-lxml==4.6.2
+lazy-object-proxy==1.6.0
+lxml==4.6.3
 mccabe==0.6.1
 mypy-extensions==0.4.3
 packaging==20.9