https://github.com/kedacore/keda/issues/2214

Signed-off-by: Siva Guruvareddiar <sivagurunath@gmail.com>

pkg/scalers/aws/aws_sigv4.go

@@ -1,3 +1,28 @@
+/*
+Copyright 2024 The KEDA Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+This file contains all the logic for caching aws.Config across all the (AWS)
+triggers. The first time when an aws.Config is requested, it's cached based on
+the authentication info (roleArn, Key&Secret, keda itself) and it's returned
+every time when an aws.Config is requested for the same authentication info.
+This is required because if we don't cache and share them, each scaler
+generates and refresh it's own token although all the tokens grants the same
+permissions
+*/
 package aws
 
 import (
@@ -23,6 +48,7 @@ var (
 	ErrAwsAMPNoAwsRegion = errors.New("no awsRegion given")
 )
 
+// add the roundTrip logic so that the request is SigV4 signed
 func (rt *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 	cred, err := rt.client.Options().Credentials.Retrieve(req.Context())
 	if err != nil {
@@ -44,6 +70,7 @@ func (rt *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 	return transport.RoundTrip(req)
 }
 
+// parse the data to get the AWS sepcific auth info and metadata
 func parseAwsAMPMetadata(config *scalersconfig.ScalerConfig) (*awsConfigMetadata, error) {
 	meta := awsConfigMetadata{}
 

pkg/scalers/aws/aws_sigv4_test.go

@@ -1,3 +1,28 @@
+/*
+Copyright 2024 The KEDA Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+This file contains all the logic for caching aws.Config across all the (AWS)
+triggers. The first time when an aws.Config is requested, it's cached based on
+the authentication info (roleArn, Key&Secret, keda itself) and it's returned
+every time when an aws.Config is requested for the same authentication info.
+This is required because if we don't cache and share them, each scaler
+generates and refresh it's own token although all the tokens grants the same
+permissions
+*/
 package aws
 
 import (