chore: add support for pydantic 2.x

requirements/base.txt

@@ -3,4 +3,4 @@ jsonschema<5,>=3.2  # TODO: evaluate risk of removing jsonschema 3.x support
 typing_extensions>=4.4,<5 # 3.7 doesn't have Literal
 
 # resource validation & schema generation
-pydantic~=1.8
+pydantic>=1.8,<3

samtranslator/compat.py

@@ -0,0 +1,8 @@
+try:
+    from pydantic import v1 as pydantic
+except ImportError:
+    # Unfortunately mypy cannot handle this try/expect pattern, and "type: ignore"
+    # is the simplest work-around. See: https://github.com/python/mypy/issues/1153
+    import pydantic  # type: ignore
+
+__all__ = ["pydantic"]

samtranslator/internal/schema_source/any_cfn_resource.py

@@ -1,5 +1,4 @@
-import pydantic
-
+from samtranslator.compat import pydantic
 from samtranslator.internal.schema_source.common import LenientBaseModel
 
 constr = pydantic.constr

samtranslator/internal/schema_source/common.py

@@ -3,10 +3,9 @@
 from pathlib import Path
 from typing import Any, Dict, List, Optional, TypeVar, Union
 
-import pydantic
-from pydantic import Extra, Field
 from typing_extensions import Literal
 
+from samtranslator.compat import pydantic
 from samtranslator.model.types import PassThrough
 
 
@@ -53,7 +52,7 @@ def passthrough_prop(sam_docs_stem: str, sam_docs_name: str, prop_path: List[str
     for s in prop_path[1:]:
         path.extend(["properties", s])
     docs = _DOCS["properties"][sam_docs_stem][sam_docs_name]
-    return Field(
+    return pydantic.Field(
         title=sam_docs_name,
         # We add a custom value to the schema containing the path to the pass-through
         # documentation; the dict containing the value is replaced in the final schema
@@ -68,7 +67,7 @@ def passthrough_prop(sam_docs_stem: str, sam_docs_name: str, prop_path: List[str
 
 def _get_prop(stem: str, name: str) -> Any:
     docs = _DOCS["properties"][stem][name]
-    return Field(
+    return pydantic.Field(
         title=name,
         # https://code.visualstudio.com/docs/languages/json#_use-rich-formatting-in-hovers
         markdownDescription=docs,
@@ -78,7 +77,7 @@ def _get_prop(stem: str, name: str) -> Any:
 # By default strict: https://pydantic-docs.helpmanual.io/usage/model_config/#change-behaviour-globally
 class BaseModel(LenientBaseModel):
     class Config:
-        extra = Extra.forbid
+        extra = pydantic.Extra.forbid
 
     def __getattribute__(self, __name: str) -> Any:
         """Overloading get attribute operation to allow access PassThroughProp without using __root__"""

samtranslator/internal/schema_source/schema.py

@@ -6,8 +6,7 @@
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Optional, Type, Union
 
-import pydantic
-
+from samtranslator.compat import pydantic
 from samtranslator.internal.schema_source import (
     any_cfn_resource,
     aws_serverless_api,

samtranslator/model/__init__.py

@@ -5,9 +5,7 @@
 from contextlib import suppress
 from typing import Any, Callable, Dict, List, Optional, Tuple, Type, TypeVar
 
-from pydantic import BaseModel
-from pydantic.error_wrappers import ValidationError
-
+from samtranslator.compat import pydantic
 from samtranslator.model.exceptions import (
     ExpectedType,
     InvalidResourceException,
@@ -17,7 +15,7 @@
 from samtranslator.model.types import IS_DICT, IS_STR, PassThrough, Validator, any_type, is_type
 from samtranslator.plugins import LifeCycleEvents
 
-RT = TypeVar("RT", bound=BaseModel)  # return type
+RT = TypeVar("RT", bound=pydantic.BaseModel)  # return type
 
 
 class PropertyType:
@@ -348,7 +346,7 @@ def validate_properties_and_return_model(self, cls: Type[RT]) -> RT:
         """
         try:
             return cls.parse_obj(self._generate_resource_dict()["Properties"])
-        except ValidationError as e:
+        except pydantic.error_wrappers.ValidationError as e:
             error_properties: str = ""
             with suppress(KeyError):
                 error_properties = ".".join(str(x) for x in e.errors()[0]["loc"])