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+# Dev Workflow Notes
+
+## Dev environment setup
+1. Add your AWS account to your aws-cli credentials file. [Learn more](https://www.serverless.com/framework/docs/providers/aws/guide/credentials#use-an-existing-aws-profile).
+   
+   - Find the aws credential file at `~/.aws/credentials`. The `~` is your home directory; for example, on Windows, it's at `C:\Users\<your_windows_username>`.
+   - Add the following to this file:
+      ```
+      [profileName, e.g. HKP]
+      aws_access_key_id=***************
+      aws_secret_access_key=***************
+      ```
+
+
+## Setup Resources (optional)
+If you need new resources, e.g. new dynamoDB tables, you need to add it to [backend-serverless-resources repository](https://github.com/HKPSolutions/backend-serverless-resources).
+
+1. Follow the example [here](https://github.com/HKPSolutions/backend-serverless-resources/pull/4/files) to add your new table to `lib\DynamoDbStack.js`. 
+
+   - Add your table:
+      (NOTE: you don't have to define data schema for dynamoDB tables.)
+
+      ```js
+      const resultsTable = new dynamodb.Table(this, "results", {
+        partitionKey: {
+          name: 'resultId',
+          type: dynamodb.AttributeType.STRING
+        }
+      });
+      ```
+
+   - Export your resources:
+
+      ```js
+      makeCfnOutput(this, app, "results-table-name", resultsTable.tableName);
+      makeCfnOutput(this, app, "results-table-arn", resultsTable.tableArn);
+      ```
+
+2. Then, push it back to github and create a PR. It will be deployed by SEED, and the `pr#` of this PR will be used as the `stage` for this deployment. **(TBD: Tag the PR draft with the `draft` label)**
+
+
+## Develop Serverless functions
+If you need to add new serverless functions, you need to add it to [backend-serverless-api repository](https://github.com/HKPSolutions/backend-serverless-api).
+
+1. Initialize your service following the example [here](https://github.com/HKPSolutions/backend-serverless-api/pull/10/commits/d651e1ca863e4daef39ccf7f1c36f96b8f0fc08c). Then use the following command to test it.
+   ```sh
+   # modify the service_name, function_name, and mock_json_file accordingly.
+   cd services/<service_name>
+   serverless invoke local -f <function_name> -p <mock_json_file>
+
+   # e.g.
+   cd services/result
+   serverless invoke local -f createResult -p createResult.json
+
+   # You should be able to get a success result:
+   # {
+   #  "statusCode": 200,
+   #  "headers": {
+   #      "Access-Control-Allow-Origin": "*",
+   #      "Access-Control-Allow-Credentials": true
+   #  },
+   #  "body": "{\"echo\":{\"x\":1,\"y\":2,\"operator\":\"add\"}}"
+   # }
+   ```
+
+2. Push your branch to github and create a PR. Your PR will get deployed by SEED, and you can get your pr#. **(TBD: Tag the PR draft with the `draft` label)**
+
+3. Setup the resources related config following this example [here](https://github.com/HKPSolutions/backend-serverless-api/pull/10/commits/a9eb1bda2877556d0169da9b803fb35f629f24e0).
+
+   - In `services/<your_service>/serverless.yml`, config the table name and iamRoleStatement for your resource :
+      ```yml
+      provider:
+        environment:
+          # import the table name 
+          # this comes from what we exported in the resources repo
+          # we can get this env var in js with "process.env.resultsTableName"
+          resultsTableName: !ImportValue '${self:custom.sstApp}-results-table-name'
+
+        # config the iamRoleStatement 
+        # so that this service have permission to use the resources
+        # NOTE: permit only the needed actions  
+        iamRoleStatements:
+          - Effect: "Allow"
+            Action:
+            - dynamodb:PutItem
+            Resource: !ImportValue '${self:custom.sstApp}-results-table-arn'
+      ```
+
+   - In your serverless function file, e.g. `services/result/createResult.js`, import the resources from the environment variables:
+      ```js
+      const resultsTableName = process.env.resultsTableName;
+      ```
+
+      Then, interact with the dynamo resources using our own library. Add dynamoDB functions in `lib/dynamo.js` as needed. 
+        ```js
+        import { Dynamo } from '../../libs/dynamo.js';
+
+        export async function handler(event, context) {
+          const data = {
+            'resultId': "000",
+            'result': 1,
+          };
+          const newResult = await Dynamo.put(data, resultsTableName);
+
+          return success({
+            result: newResult,
+          });
+        }
+        ```
+
+4. Add the sstMapping in `serverless.commom.yml` IFF your resource is NOT merged into master branch of resource repo yet.  
+    ```yml
+    custom:
+      sstAppMapping: 
+        # add the mapping here following the rule:
+        # <pr#_of_your_branch_on_API_repo>: <pr#_of_your_branch_on_RESOURCE_repo>
+        pr10: pr4
+    ```
+   
+5. Test it with the following command. 
+   When our PR is deployed by SEED, it sets the `stage` to the `pr#`, but `serverless invoke local` won't do that, so we need to specify it. We also need to use our HKP AWS account to interact with the resources on AWS. 
+    ```sh
+    # modify the service_name, function_name, and mock_json_file accordingly.
+    cd services/<service_name>
+
+    serverless invoke local \
+    -f <function_name> \
+    -p <mock_json_file> \
+    --stage <pr\#_of_your_branch_on_API_repo> \
+    --aws-profile <profile_name_in_~/.aws/credentials>
+
+    # e.g.
+    serverless invoke local \
+    -f createResult \
+    -p createResult.json \
+    --stage pr10 \
+    --aws-profile HKP
+
+    # You should be able to get a success result and logs:
+    # [INFO] params for Dynamo.put { TableName: 'pr4-beta-infra-dynamodb-results7EA05C64-1PE7G5W5P2M4Z',
+    #   Item: { resultId: '000', result: 1 } }
+    # {
+    #     "statusCode": 200,
+    #     "headers": {
+    #         "Access-Control-Allow-Origin": "*",
+    #         "Access-Control-Allow-Credentials": true
+    #     },
+    #     "body": "{\"result\":{\"resultId\":\"000\",\"result\":1},\"echo\":{\"x\":1,\"y\":2,\"operator\":\"add\"}}"
+    # }
+    ```
+
+6. Add the actual business logic and develop your APIs. 
+   
+7. Test your APIs with `serverless invoke local` to catch any syntax and/or webpack errors that might cause fail deployment with SEED.
+
+8. After you successfully deploy your service with SEED, go to AWS console -> API gateway to find the URL of your build. Test it with Postman. **(NOTE: now SEED is not deploying newly added services, ask Caleb to deploy it manually if needed.)**
+
+
+## Testing
+[Examples of mock.json for serverless invoke local](https://serverless-stack.com/chapters/invoke-lambda-functions-locally.html)
+
+
+## Useful Git commands
+1. stash local changes when you want to checkout to other branch, but don't want to commit these changes.
+    ```sh
+    # stash local changes
+    git stash
+
+    # list all stash
+    git stash list
+
+    # apply changes from a stash
+    gut stash apply <stash_name>
+    ```
+
+2. create and checkout to a new feature branch
+    ```sh
+    git checkout -b <add-new-feature>
+    ```
+
+3. Before pushing your branch to github, merge master/main branch to resolve any potential conflicts.
+
+    ```sh
+    # update the master/main branch
+    git checkout main
+    git pull
+
+    # on your feature branch, merge master
+    git checkout <branch_name>
+    git merge master
+
+    # push your branch
+    # set up the upstream with `-u` at the first push
+    # Then you can simply use `git push`
+    git push -u origin <branch_name> 
+    ```
+
+
+## Other References
+[Serverless Stack Guideline](https://serverless-stack.com/#table-of-contents)