feat: improve schema pass-through handling

samtranslator/internal/schema_source/aws_serverless_function.py

@@ -16,6 +16,8 @@
     passthrough_prop,
 )
 
+PROPERTIES_STEM = "sam-resource-function"
+
 alexaskilleventproperties = get_prop("sam-property-function-alexaskill")
 apiauth = get_prop("sam-property-function-apifunctionauth")
 apieventproperties = get_prop("sam-property-function-api")
@@ -502,8 +504,19 @@ class Properties(BaseModel):
     DeadLetterQueue: Optional[DeadLetterQueueType] = prop("DeadLetterQueue")
     DeploymentPreference: Optional[DeploymentPreference] = prop("DeploymentPreference")
     Description: Optional[Description] = prop("Description")
-    Environment: Optional[Environment] = passthrough_prop("AWS::Lambda::Function", "Environment")
-    EphemeralStorage: Optional[EphemeralStorage] = passthrough_prop("AWS::Lambda::Function", "EphemeralStorage")
+    # TODO: Make the notation shorter; resource type and SAM/CFN property names usually same
+    Environment: Optional[Environment] = passthrough_prop(
+        PROPERTIES_STEM,
+        "Environment",
+        "AWS::Lambda::Function",
+        "Environment",
+    )
+    EphemeralStorage: Optional[EphemeralStorage] = passthrough_prop(
+        PROPERTIES_STEM,
+        "EphemeralStorage",
+        "AWS::Lambda::Function",
+        "EphemeralStorage",
+    )
     EventInvokeConfig: Optional[EventInvokeConfig] = prop("EventInvokeConfig")
     Events: Optional[
         Dict[
@@ -532,7 +545,12 @@ class Properties(BaseModel):
         ]
     ] = prop("Events")
     FileSystemConfigs: Optional[PassThroughProp] = prop("FileSystemConfigs")
-    FunctionName: Optional[PassThroughProp] = passthrough_prop("AWS::Lambda::Function", "FunctionName")
+    FunctionName: Optional[PassThroughProp] = passthrough_prop(
+        PROPERTIES_STEM,
+        "FunctionName",
+        "AWS::Lambda::Function",
+        "FunctionName",
+    )
     FunctionUrlConfig: Optional[FunctionUrlConfig] = prop("FunctionUrlConfig")
     Handler: Optional[Handler] = prop("Handler")
     ImageConfig: Optional[PassThroughProp] = prop("ImageConfig")
@@ -545,7 +563,12 @@ class Properties(BaseModel):
     RolePath: Optional[RolePath] = prop("RolePath")
     PermissionsBoundary: Optional[PermissionsBoundary] = prop("PermissionsBoundary")
     Policies: Optional[Union[str, DictStrAny, List[Union[str, DictStrAny]]]] = prop("Policies")
-    ProvisionedConcurrencyConfig: Optional[ProvisionedConcurrencyConfig] = prop("ProvisionedConcurrencyConfig")
+    ProvisionedConcurrencyConfig: Optional[ProvisionedConcurrencyConfig] = passthrough_prop(
+        PROPERTIES_STEM,
+        "ProvisionedConcurrencyConfig",
+        "AWS::Lambda::Alias",
+        "ProvisionedConcurrencyConfig",
+    )
     ReservedConcurrentExecutions: Optional[ReservedConcurrentExecutions] = prop("ReservedConcurrentExecutions")
     Role: Optional[SamIntrinsicable[str]] = prop("Role")
     Runtime: Optional[Runtime] = prop("Runtime")
@@ -567,7 +590,12 @@ class Globals(BaseModel):
     MemorySize: Optional[MemorySize] = prop("MemorySize")
     Timeout: Optional[Timeout] = prop("Timeout")
     VpcConfig: Optional[VpcConfig] = prop("VpcConfig")
-    Environment: Optional[Environment] = passthrough_prop("AWS::Lambda::Function", "Environment")
+    Environment: Optional[Environment] = passthrough_prop(
+        PROPERTIES_STEM,
+        "Environment",
+        "AWS::Lambda::Function",
+        "Environment",
+    )
     Tags: Optional[Tags] = prop("Tags")
     Tracing: Optional[Tracing] = prop("Tracing")
     KmsKeyArn: Optional[KmsKeyArn] = prop("KmsKeyArn")
@@ -581,7 +609,12 @@ class Globals(BaseModel):
     AssumeRolePolicyDocument: Optional[AssumeRolePolicyDocument] = prop("AssumeRolePolicyDocument")
     EventInvokeConfig: Optional[EventInvokeConfig] = prop("EventInvokeConfig")
     Architectures: Optional[Architectures] = prop("Architectures")
-    EphemeralStorage: Optional[EphemeralStorage] = passthrough_prop("AWS::Lambda::Function", "EphemeralStorage")
+    EphemeralStorage: Optional[EphemeralStorage] = passthrough_prop(
+        PROPERTIES_STEM,
+        "EphemeralStorage",
+        "AWS::Lambda::Function",
+        "EphemeralStorage",
+    )
     SnapStart: Optional[SnapStart] = prop("SnapStart")
     RuntimeManagementConfig: Optional[RuntimeManagementConfig] = prop("RuntimeManagementConfig")
 

samtranslator/internal/schema_source/common.py

@@ -40,16 +40,22 @@ def get_prop(stem: str) -> Any:
     return partial(_get_prop, stem)
 
 
-def passthrough_prop(resource_type: str, path: str) -> Any:
+def passthrough_prop(sam_docs_stem: str, sam_docs_name: str, resource_type: str, prop_path: str) -> Any:
     """
     Specifies a pass-through field, where resource_type is the CloudFormation
     resource type, and path is a `.`-delimitated path to the property.
     """
-    prop_path = f"definitions.{resource_type}.properties.Properties.properties.{path}"
+    prop_path = f"definitions.{resource_type}.properties.Properties.properties.{prop_path}"
+    docs = _DOCS["properties"][sam_docs_stem][sam_docs_name]
     return Field(
         # 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
-        __samPassThroughPath=prop_path,
+        __samPassThrough={
+            # To know at schema build-time where to find the property schema
+            "schemaPath": prop_path,
+            # Use SAM docs at the top-level pass-through; it can include useful SAM-specific information
+            "markdownDescriptionOverride": docs,
+        },
     )
 
 

samtranslator/internal/schema_source/schema.py

@@ -2,6 +2,7 @@
 
 import argparse
 import json
+from copy import deepcopy
 from pathlib import Path
 from typing import Any, Callable, Dict, Optional, Type, Union
 
@@ -149,10 +150,16 @@ def extend_with_cfn_schema(sam_schema: Dict[str, Any], cfn_schema: Dict[str, Any
     _add_embedded_connectors(sam_schema)
 
     # Inject CloudFormation documentation to SAM pass-through properties
+    def replace_passthrough(d: Dict[str, Any]) -> Dict[str, Any]:
+        passthrough = d["__samPassThrough"]
+        schema = deepcopy(_deep_get(cfn_schema, passthrough["schemaPath"]))
+        schema["markdownDescription"] = passthrough["markdownDescriptionOverride"]
+        return schema
+
     _replace_in_dict(
         sam_schema,
-        "__samPassThroughPath",
-        lambda d: _deep_get(cfn_schema, d["__samPassThroughPath"]),
+        "__samPassThrough",
+        replace_passthrough,
     )
 
     # The unified schema should include all supported properties

samtranslator/schema/schema.json

@@ -200647,12 +200647,12 @@
         },
         "Environment": {
           "$ref": "#/definitions/AWS::Lambda::Function.Environment",
-          "markdownDescription": "Environment variables that are accessible from function code during execution\\.  \n*Required*: No  \n*Type*: [Environment](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html)  \n*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)",
+          "markdownDescription": "The configuration for the runtime environment\\.  \n*Type*: [Environment](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`Environment`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html) property of an `AWS::Lambda::Function` resource\\.",
           "title": "Environment"
         },
         "EphemeralStorage": {
           "$ref": "#/definitions/AWS::Lambda::Function.EphemeralStorage",
-          "markdownDescription": "The size of the function's `/tmp` directory in MB\\. The default value is 512, but it can be any whole number between 512 and 10,240 MB\\.  \n*Required*: No  \n*Type*: [EphemeralStorage](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-ephemeralstorage.html)  \n*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)",
+          "markdownDescription": "An object that specifies the disk space, in MB, available to your Lambda function in `/tmp`\\.  \nFor more information about this property, see [Lambda execution environment](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-context.html) in the *AWS Lambda Developer Guide*\\.  \n*Type*: [EphemeralStorage](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-ephemeralstorage)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`EphemeralStorage`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-ephemeralstorage) property of an `AWS::Lambda::Function` resource\\.",
           "title": "EphemeralStorage"
         },
         "EventInvokeConfig": {
@@ -200934,12 +200934,12 @@
         },
         "Environment": {
           "$ref": "#/definitions/AWS::Lambda::Function.Environment",
-          "markdownDescription": "Environment variables that are accessible from function code during execution\\.  \n*Required*: No  \n*Type*: [Environment](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html)  \n*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)",
+          "markdownDescription": "The configuration for the runtime environment\\.  \n*Type*: [Environment](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`Environment`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-environment.html) property of an `AWS::Lambda::Function` resource\\.",
           "title": "Environment"
         },
         "EphemeralStorage": {
           "$ref": "#/definitions/AWS::Lambda::Function.EphemeralStorage",
-          "markdownDescription": "The size of the function's `/tmp` directory in MB\\. The default value is 512, but it can be any whole number between 512 and 10,240 MB\\.  \n*Required*: No  \n*Type*: [EphemeralStorage](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-ephemeralstorage.html)  \n*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)",
+          "markdownDescription": "An object that specifies the disk space, in MB, available to your Lambda function in `/tmp`\\.  \nFor more information about this property, see [Lambda execution environment](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-context.html) in the *AWS Lambda Developer Guide*\\.  \n*Type*: [EphemeralStorage](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-ephemeralstorage)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`EphemeralStorage`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-ephemeralstorage) property of an `AWS::Lambda::Function` resource\\.",
           "title": "EphemeralStorage"
         },
         "EventInvokeConfig": {
@@ -201030,7 +201030,7 @@
           "title": "FileSystemConfigs"
         },
         "FunctionName": {
-          "markdownDescription": "The name of the Lambda function, up to 64 characters in length\\. If you don't specify a name, AWS CloudFormation generates one\\.  \nIf you specify a name, you cannot perform updates that require replacement of this resource\\. You can perform updates that require no or some interruption\\. If you must replace the resource, specify a new name\\.  \n*Required*: No  \n*Type*: String  \n*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)",
+          "markdownDescription": "A name for the function\\. If you don't specify a name, a unique name is generated for you\\.  \n*Type*: String  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`FunctionName`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-functionname) property of an `AWS::Lambda::Function` resource\\.",
           "title": "FunctionName",
           "type": "string"
         },
@@ -201161,12 +201161,7 @@
           "title": "Policies"
         },
         "ProvisionedConcurrencyConfig": {
-          "allOf": [
-            {
-              "$ref": "#/definitions/PassThroughProp"
-            }
-          ],
-          "description": "The provisioned concurrency configuration of a function's alias\\.  \n`ProvisionedConcurrencyConfig` can be specified only if the `AutoPublishAlias` is set\\. Otherwise, an error results\\.\n*Type*: [ProvisionedConcurrencyConfig](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-alias.html#cfn-lambda-alias-provisionedconcurrencyconfig)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`ProvisionedConcurrencyConfig`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-alias.html#cfn-lambda-alias-provisionedconcurrencyconfig) property of an `AWS::Lambda::Alias` resource\\.",
+          "$ref": "#/definitions/AWS::Lambda::Alias.ProvisionedConcurrencyConfiguration",
           "markdownDescription": "The provisioned concurrency configuration of a function's alias\\.  \n`ProvisionedConcurrencyConfig` can be specified only if the `AutoPublishAlias` is set\\. Otherwise, an error results\\.\n*Type*: [ProvisionedConcurrencyConfig](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-alias.html#cfn-lambda-alias-provisionedconcurrencyconfig)  \n*Required*: No  \n*AWS CloudFormation compatibility*: This property is passed directly to the [`ProvisionedConcurrencyConfig`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-alias.html#cfn-lambda-alias-provisionedconcurrencyconfig) property of an `AWS::Lambda::Alias` resource\\.",
           "title": "ProvisionedConcurrencyConfig"
         },