Make Moto (tests) compatible with flask/werkzeug 2.x (#3923)

* Dont fail if CodeCov fails - for now

* CI - Force cache rebuild

* Bump werkzeug to latest version

* CI - Enforce cache flush

* ManagedBlockchain - fix error format

* ManagedBlockchain - Fix tests to use pytest.raises paradigm

* Revert "Lock Flask (#3925)"

This reverts commit 8bb0feb956.

* CI - Enforce cache rebuild

moto/managedblockchain/exceptions.py

@@ -1,10 +1,55 @@
 from __future__ import unicode_literals
-from moto.core.exceptions import RESTError
+from functools import wraps
+from werkzeug.exceptions import HTTPException
+from jinja2 import DictLoader, Environment
 
 
-class ManagedBlockchainClientError(RESTError):
+ERROR_JSON_RESPONSE = """{
+    "message": "{{message}}"
+}
+"""
+
+
+def exception_handler(f):
+    @wraps(f)
+    def _wrapper(*args, **kwargs):
+        try:
+            return f(*args, **kwargs)
+        except ManagedBlockchainClientError as err:
+            return err.code, err.get_headers(), err.description
+
+    return _wrapper
+
+
+class ManagedBlockchainClientError(HTTPException):
     code = 400
 
+    templates = {
+        "error": ERROR_JSON_RESPONSE,
+    }
+
+    def __init__(self, error_type, message, **kwargs):
+        super(HTTPException, self).__init__()
+        env = Environment(loader=DictLoader(self.templates))
+        self.error_type = error_type
+        self.message = message
+        self.description = env.get_template("error").render(
+            error_type=error_type, message=message, **kwargs
+        )
+
+    def get_headers(self, *args, **kwargs):
+        return [
+            ("Content-Type", "application/json"),
+            ("x-amzn-ErrorType", self.error_type),
+        ]
+
+    @property
+    def response(self):
+        return self.get_body()
+
+    def get_body(self, *args, **kwargs):
+        return self.description
+
 
 class BadRequestException(ManagedBlockchainClientError):
     def __init__(self, pretty_called_method, operation_error):

moto/managedblockchain/responses.py

@@ -4,6 +4,7 @@ import json
 from six.moves.urllib.parse import urlparse, parse_qs
 
 from moto.core.responses import BaseResponse
+from .exceptions import exception_handler
 from .models import managedblockchain_backends
 from .utils import (
     region_from_managedblckchain_url,
@@ -21,6 +22,7 @@ class ManagedBlockchainResponse(BaseResponse):
         self.backend = backend
 
     @classmethod
+    @exception_handler
     def network_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -73,6 +75,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, json.dumps(response)
 
     @classmethod
+    @exception_handler
     def networkid_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -94,6 +97,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, response
 
     @classmethod
+    @exception_handler
     def proposal_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -139,6 +143,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, json.dumps(response)
 
     @classmethod
+    @exception_handler
     def proposalid_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -160,6 +165,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, response
 
     @classmethod
+    @exception_handler
     def proposal_votes_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -203,6 +209,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, ""
 
     @classmethod
+    @exception_handler
     def invitation_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -224,6 +231,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, response
 
     @classmethod
+    @exception_handler
     def invitationid_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -243,6 +251,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, ""
 
     @classmethod
+    @exception_handler
     def member_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -283,6 +292,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, json.dumps(response)
 
     @classmethod
+    @exception_handler
     def memberid_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -327,6 +337,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, ""
 
     @classmethod
+    @exception_handler
     def node_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(
@@ -380,6 +391,7 @@ class ManagedBlockchainResponse(BaseResponse):
         return 200, headers, json.dumps(response)
 
     @classmethod
+    @exception_handler
     def nodeid_response(clazz, request, full_url, headers):
         region_name = region_from_managedblckchain_url(full_url)
         response_instance = ManagedBlockchainResponse(