fix(forwarder): adjust memory and timeout based on URI (#259)

We want to specify a higher default if destination is HTTP

We define all parameters as strings so as to be able to specify an empty
string by default. This ensures we can safely update defaults later.

apps/forwarder/template.yaml

@@ -33,11 +33,8 @@ Metadata:
           - ContentTypeOverrides
           - SourceKMSKeyArns
           - DebugEndpoint
-
-Globals:
-  Function:
-    Timeout: 300
-    MemorySize: 128
+          - MemorySize
+          - Timeout
 
 Parameters:
   DestinationUri:
@@ -101,6 +98,29 @@ Parameters:
       Endpoint to send additional debug telemetry to.
     Default: ''
     AllowedPattern: "^(http(s)?:\/\/.*)?$"
+  MemorySize:
+    Type: String
+    Description: >-
+      The amount of memory, in megabytes, that your function has access to.
+    Default: ''
+    AllowedValues:
+      - ''
+      - '64'
+      - '128'
+      - '256'
+      - '512'
+      - '1024'
+      - '2048'
+      - '4096'
+      - '8128'
+    AllowedPattern: "^[0-9]*$"
+  Timeout:
+    Type: String
+    Description: >-
+      The amount of time that Lambda allows a function to run before stopping
+      it. The maximum allowed value is 900 seconds.
+    Default: ''
+    AllowedPattern: "^[0-9]*$"
 Conditions:
   NoDataAccessPointArn: !Equals
     - !Ref DataAccessPointArn
@@ -111,9 +131,15 @@ Conditions:
   HasS3DestinationWithoutAccessPoint: !And
     - !Condition HasS3Destination
     - !Condition NoDataAccessPointArn
-  IsMaxFileSizeEmpty: !Equals
+  UseDefaultMaxFileSize: !Equals
     - !Ref MaxFileSize
     - ''
+  UseDefaultMemorySize: !Equals
+    - !Ref MemorySize
+    - ''
+  UseDefaultTimeout: !Equals
+    - !Ref Timeout
+    - ''
   DisableSourceS3: !Equals
     - !Join
       - ''
@@ -344,6 +370,17 @@ Resources:
       CodeUri: ../..
       Handler: bootstrap
       Runtime: provided.al2
+      MemorySize: !If
+        - UseDefaultMemorySize
+        - !If
+          - HasS3Destination
+          - "128"
+          - "256"
+        - !Ref MemorySize
+      Timeout: !If
+        - UseDefaultTimeout
+        - "300"
+        - !Ref Timeout
       Architectures:
         - arm64
       Events:
@@ -359,7 +396,10 @@ Resources:
         Variables:
           DESTINATION_URI: !Ref DestinationUri
           VERBOSITY: 9
-          MAX_FILE_SIZE: !If [ IsMaxFileSizeEmpty, '1073741824', !Ref MaxFileSize ]
+          MAX_FILE_SIZE: !If
+            - UseDefaultMaxFileSize
+            - "1073741824"
+            - !Ref MaxFileSize
           CONTENT_TYPE_OVERRIDES: !Join
             - ","
             - !Ref ContentTypeOverrides