serverless-offline-sns

    0.76.0 • Public • Published

    serverless-offline-sns

    A serverless plugin to listen to offline SNS and call lambda fns with events.

    serverless build status npm version PRs Welcome code style: prettier License: MIT All Contributors

    Docs

    For an example of a working application please see serverless-offline-sns-example

    Prerequisites

    This plugin provides an SNS server configured automatically without you specifying an endpoint.

    If you'd rather use your own endpoint, e.g. from your AWS account or a localstack SNS server endpoint, you can put it in the custom config. See below for details.

    Installation

    Install the plugin

    npm install serverless-offline-sns --save

    Let serverless know about the plugin

    plugins:
      - serverless-offline-sns

    Note that ordering matters when used with serverless-offline and serverless-webpack. serverless-webpack must be specified at the start of the list of plugins.

    Configure the plugin with your offline SNS endpoint, host to listen on, and a free port the plugin can use.

    custom:
      serverless-offline-sns:
        port: 4002 # a free port for the sns server to run on
        debug: false
        # host: 0.0.0.0 # Optional, defaults to 127.0.0.1 if not provided to serverless-offline
        # sns-endpoint: http://127.0.0.1:4567 # Optional. Only if you want to use a custom SNS provider endpoint
        # sns-subscribe-endpoint: http://127.0.0.1:3000 # Optional. Only if you want to use a custom subscribe endpoint from SNS to send messages back to
        # accountId: 123456789012 # Optional
        # location .build # Optional if the location of your handler.js is not in ./ (useful for typescript)

    For example, if you would like to connect to AWS and have callbacks coming via ngrok, use:

    serverless-offline-sns:
        sns-endpoint: sns.${self:provider.region}.amazonaws.com
        sns-subscribe-endpoint: <ngrok_url>
        remotePort: 80
        localPort: <ngrok_port>
        accountId: ${self:provider.accountId}

    In normal operation, the plugin will use the same --host option as provided to serverless-offline. The host parameter as shown above overrides this setting.

    If you are using the serverless-offline plugin serverless-offline-sns will start automatically. If you are not using this plugin you can run the following command instead:

    serverless offline-sns start

    Configure

    Configure your function handlers with events as described in the Serverless SNS Documentation

    Here's an example serverless.yml config which calls a function on an SNS notifcation. Note that the offline-sns plugin will automatically pick up this config, subscribe to the topic and call the handler on an SNS notification.

    functions:
      pong:
        handler: handler.pong
        events:
          - sns: test-topic

    Or you can use the exact ARN of the topic, in 2 ways:

    functions:
      pong:
        handler: handler.pong
        events:
          - sns:
             arn: "arn:aws:sns:us-east-1:123456789012:test-topic" # 1st way
          - sns: "arn:aws:sns:us-east-1:123456789012:test-topic-two" # 2nd way

    Here's a demo of some code that will trigger this handler:

    var AWS = require("aws-sdk"); // must be npm installed to use
    var sns = new AWS.SNS({
      endpoint: "http://127.0.0.1:4002",
      region: "us-east-1",
    });
    sns.publish({
      Message: "{content: \"hello!\"}",
      MessageStructure: "json",
      TopicArn: "arn:aws:sns:us-east-1:123456789012:test-topic",
    }, () => {
      console.log("ping");
    });

    Note the region that offline-sns will listen on is what is configured in your serverless.yml provider.

    Localstack docker configuration

    In order to listen to localstack SNS event, if localstack is started with docker, you need the following:

    custom:
      serverless-offline-sns:
        host: 0.0.0.0 # Enable plugin to listen on every local address
        sns-subscribe-endpoint: 192.168.1.225 #Host ip address
        sns-endpoint: http://localhost:4575 # Default localstack sns endpoint

    What happens is that the container running localstack will execute a POST request to the plugin, but to reach outside the container, it needs to use the host ip address.

    Hosted AWS SNS configuration

    In order to listen to a hosted SNS on AWS, you need the following:

    custom:
      serverless-offline-sns:
        localPort: ${env:LOCAL_PORT}
        remotePort: ${env:SNS_SUBSCRIBE_REMOTE_PORT}
        host: 0.0.0.0
        sns-subscribe-endpoint: ${env:SNS_SUBSCRIBE_ENDPOINT}
        sns-endpoint: ${env:SNS_ENDPOINT}```

    If you want to unsubscribe when you stop your server, then call sls offline-sns cleanup when the script exits.

    Multiple serverless services configuration

    If you have multiple serverless services, please specify a root directory:

    custom:
      serverless-offline-sns:
        servicesDirectory: "/path/to/directory"

    The root directory must contain directories with serverless.yaml files inside.

    Usage

    If you use serverless-offline this plugin will start automatically.

    However if you don't use serverless-offline you can start this plugin manually with -

    serverless offline-sns start

    Subscribing

    serverless-offline-sns supports http, https, and sqs subscriptions. email, email-json, sms, application, and lambda protocols are not supported at this time.

    When using sqs the Endpoint for the subscription must be the full QueueUrl returned from the SQS service when creating the queue or listing with ListQueues:

    // async
    const queue = await sqs.createQueue({ QueueName: 'my-queue' }).promise();
    const subscription = await sns.subscribe({
        TopicArn: myTopicArn,
        Protocol: 'sqs',
        Endpoint: queue.QueueUrl,
    }).promise();

    Contributors

    Happy to accept contributions, feature requests and issues.

    Thanks goes to these wonderful people (emoji key):


    Matthew James

    💬 💻 🎨 📖 💡

    darbio

    🐛 💻

    TiVoMaker

    🐛 💻 🎨 📖

    Jade Hwang

    🐛

    Bennett Rogers

    🐛 💻

    Julius Breckel

    💻 💡 ⚠️

    RainaWLK

    🐛 💻

    Jamie Learmonth

    🐛

    Gevorg A. Galstyan

    🐛 💻

    Ivan Montiel

    🐛 💻 ⚠️

    Matt Ledom

    💻 🎨

    Keith Kirk

    💻 🎨

    Kobi Meirson

    💻

    Steve Green

    💻

    Daniel

    🐛 💻 🎨

    Zdenek Farana

    💻

    Daniel Maricic

    💻

    Brandon Evans

    💻

    AJ Stuyvenberg

    💬 💻 ⚠️

    justin.kruse

    ⚠️ 💻

    Clement134

    🐛 💻

    PJ Cavanaugh

    🐛 💻

    Victor Ferreira

    🐛 💻

    Theo

    📖

    Matt Telesky

    🐛 💻

    Garrett Scott

    🐛 💻

    Patrice Gargiolo

    📖

    Michael W. Martin

    🐛 💻

    mr-black-8

    🐛 💻

    Matthew Miller

    🐛 💻

    Jason Pell

    💻

    ziktar

    🐛 💻

    stevencsf

    🐛

    Alexandre

    💻

    Keith Kirk

    💻

    Christian Musa

    💻

    Glavin Wiechert

    💻

    James Gregory

    💻

    Richard

    💻

    alex-vance

    💻

    christiangoltz

    💻

    Artem Yefimenko

    💻

    This project follows the all-contributors specification. Contributions of any kind welcome!

    Install

    npm i serverless-offline-sns

    DownloadsWeekly Downloads

    15,639

    Version

    0.76.0

    License

    MIT

    Unpacked Size

    143 kB

    Total Files

    15

    Last publish

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