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08-version-lambda.md

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Version Lambda

This section explains how to version the lambda code. We will use the helloLambdaCLIWorld.js lambda to version from (3).

(1) Publish Version for helloLambdaCLIWorld

Lets version the helloLambdaCLIWorld lambda.

(1.1) Create Lambda helloLambdaCLIWorld
➜  export AWS_REGION=us-east-1
➜  export AWS_PROFILE=lambda-cli-user
➜  aws lambda publish-version \
     --function-name helloLambdaCLIWorld \
     --profile "$AWS_PROFILE"

Output : Notice the version number "1" at the end of FunctionArn in the output.

{
    "FunctionName": "helloLambdaCLIWorld",
    "FunctionArn": "arn:aws:lambda:us-east-1:919191919191:function:helloLambdaCLIWorld:1",
    "Runtime": "nodejs10.x",
    "Role": "arn:aws:iam::919191919191:role/lambda-cli-role",
    "Handler": "helloLambdaCLIWorld.handler",
    "CodeSize": 334,
    "Description": "",
    "Timeout": 3,
    "MemorySize": 128,
    "LastModified": "2019-11-18T16:15:54.586+0000",
    "CodeSha256": "aBcDEeFG1H2IjKlM3nOPQrS4Tuv5W6xYZaB+7CdEf8g=",
    "Version": "1",
    "TracingConfig": {
        "Mode": "PassThrough"
    },
    "RevisionId": "123b9999-a1bb-1234-9a3b-777r2220a111"
}

Change helloLambdaCLIWorld.js

Following command will create a nodejs AWS Lambda function responding 'Hello Lambda CLI World (v2)'.

➜  echo "exports.handler =  async (event) => {
  const payload = {
    date: new Date(),
    message: 'Hello Lambda CLI World (v2)'
  };
  return JSON.stringify(payload);
};" > helloLambdaCLIWorld.js

(2) Compress the lambda source file

➜  zip -r /tmp/helloLambdaCLIWorld.js.zip helloLambdaCLIWorld.js

(3) Deploy the lambda with a new version

We will use update-function-code instead of create-function to update the source code of HelloCLIWorldLambda.

➜  aws lambda update-function-code \
       --function-name helloLambdaCLIWorld \
       --zip-file 'fileb:///tmp/helloLambdaCLIWorld.js.zip' \
       --profile "$AWS_PROFILE"

(4) Version the updated Lambda

We will update the version of the lambda to v2

➜  aws lambda publish-version \
       --function-name helloLambdaCLIWorld \
       --profile "$AWS_PROFILE"

(5) List all versions for the function

We can list both versions of the helloLambdaCLIWorld as below.

➜ aws lambda list-versions-by-function \
    --function-name helloLambdaCLIWorld \
    --profile "$AWS_PROFILE"

(6) Invoke specific versions

We can invoke both version 1 and version 2 as below.

# Invoke version 1
➜  aws lambda invoke \
     --function-name helloLambdaCLIWorld \
     --profile "$AWS_PROFILE" \
     --qualifier 1 \
     --log-type Tail \
     --payload '{}' outputfile.txt

# Invoke version 2
➜  aws lambda invoke \
     --function-name helloLambdaCLIWorld \
     --profile "$AWS_PROFILE" \
     --qualifier 2 \
     --log-type Tail \
     --payload '{}' outputfile.txt

The output will be as below, accordingly (cat output.txt).

(v1) Output:

"{\"date\":\"2019-11-18T16:35:58.554Z\",\"message\":\"Hello Lambda CLI World\"}"%

(v2) Output:

"{\"date\":\"2019-11-18T16:36:11.588Z\",\"message\":\"Hello Lambda CLI World (v2)\"}"%

🏁 Congrats ! You versioned your Lambda functions, listed them and invoked specific versions successfully. 🏁

Next: Managing Your Lambda