Repository: serverless/serverless (JavaScript) — Bug Fix

Issue:
CloudWatch logs are not created in 1.6
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# This is a Bug Report

## Description

When I deploy my service, the logs are not created. I think it is because of this piece of code: https://github.com/serverless/serverless/blob/master/lib/plugins/aws/deploy/lib/mergeIamTemplates.js#L18-L27 which in my case prematurely terminate the function on line 27 because of the if conditional on line 19 - I have defined custom role for lambda functions (i.e. I have `provider.role` in my serverless.yml, see https://github.com/keboola/developer-portal/blob/master/serverless.yml#L35). Why is there this code? I don't really understand it's reason.


## Additional Data

* ***Serverless Framework Version you're using***: 1.6.0
* ***Operating System***: macOS 12.12
* ***Stack Trace***:
* ***Provider Error messages***:



Discussion:
@JakubMatejka thanks for reporting. You're right, I think this is a bug. This is a legacy line from when we were handling logging implicitly before. But should be changed. I'll look into it asap

Resolving patch:
diff --git a/lib/plugins/aws/deploy/lib/mergeIamTemplates.js b/lib/plugins/aws/deploy/lib/mergeIamTemplates.js
index 69c0886240b..ec158b4f766 100644
--- a/lib/plugins/aws/deploy/lib/mergeIamTemplates.js
+++ b/lib/plugins/aws/deploy/lib/mergeIamTemplates.js
@@ -11,6 +11,22 @@ module.exports = {
   },
 
   merge() {
+    this.serverless.service.getAllFunctions().forEach((functionName) => {
+      const functionObject = this.serverless.service.getFunction(functionName);
+      const logGroupLogicalId = this.provider.naming
+        .getLogGroupLogicalId(functionName);
+      const newLogGroup = {
+        [logGroupLogicalId]: {
+          Type: 'AWS::Logs::LogGroup',
+          Properties: {
+            LogGroupName: this.provider.naming.getLogGroupName(functionObject.name),
+          },
+        },
+      };
+      _.merge(this.serverless.service.provider.compiledCloudFormationTemplate.Resources,
+        newLogGroup);
+    });
+
     if (!this.serverless.service.getAllFunctions().length) {
       return BbPromise.resolve();
     }
@@ -69,19 +85,8 @@ module.exports = {
       );
 
       this.serverless.service.getAllFunctions().forEach((functionName) => {
-        const functionObject = this.serverless.service.getFunction(functionName);
         const logGroupLogicalId = this.provider.naming
           .getLogGroupLogicalId(functionName);
-        const newLogGroup = {
-          [logGroupLogicalId]: {
-            Type: 'AWS::Logs::LogGroup',
-            Properties: {
-              LogGroupName: this.provider.naming.getLogGroupName(functionObject.name),
-            },
-          },
-        };
-        _.merge(this.serverless.service.provider.compiledCloudFormationTemplate.Resources,
-          newLogGroup);
 
         this.serverless.service.provider.compiledCloudFormationTemplate
           .Resources[this.provider.naming.getPolicyLogicalId()]


Test patch:
diff --git a/lib/plugins/aws/deploy/lib/mergeIamTemplates.test.js b/lib/plugins/aws/deploy/lib/mergeIamTemplates.test.js
index b0061354c4a..4c599c166f4 100644
--- a/lib/plugins/aws/deploy/lib/mergeIamTemplates.test.js
+++ b/lib/plugins/aws/deploy/lib/mergeIamTemplates.test.js
@@ -208,6 +208,29 @@ describe('#mergeIamTemplates()', () => {
     });
   });
 
+  it('should add a CloudWatch LogGroup resource if all functions use custom roles', () => {
+    awsDeploy.serverless.service.functions[functionName].role = 'something';
+    const normalizedName = awsDeploy.provider.naming.getLogGroupLogicalId(functionName);
+    return awsDeploy.mergeIamTemplates().then(() => {
+      expect(awsDeploy.serverless.service.provider.compiledCloudFormationTemplate
+        .Resources[normalizedName]
+      ).to.deep.equal(
+        {
+          Type: 'AWS::Logs::LogGroup',
+          Properties: {
+            LogGroupName: awsDeploy.provider.naming.getLogGroupName(functionName),
+          },
+        }
+      );
+
+      const roleLogicalId = awsDeploy.provider.naming.getRoleLogicalId();
+      expect(awsDeploy.serverless.service.provider.compiledCloudFormationTemplate
+        .Resources[roleLogicalId]
+      ).to.equal(undefined);
+      delete awsDeploy.serverless.service.functions[functionName].role;
+    });
+  });
+
   it('should update IamPolicyLambdaExecution with a logging resource for the function', () => {
     awsDeploy.serverless.service.functions = {
       func0: {