Destinations
Overview

Destinations

Destinations, like actions, abstract the delivery and connection logic required to send events to services like Amazon S3, or targets like HTTP and email.

However, Destinations are different than actions in two ways:

  • Events are delivered to the Destinations asynchronously, after your workflow completes. This means you don't wait for network I/O (e.g. for HTTP requests or connection overhead for data warehouses) within your workflow code, so you can process more events faster.
  • In the case of data stores like S3, you typically don't want to send every event on its own. This can be costly and carries little benefit. Instead, you typically want to batch a collection of events together, sending the batch at some frequency. Destinations handle that batching for relevant services.

The docs below discuss features common to all Destinations. See the docs for a given destination for information specific to those destinations.

Available Destinations

Using destinations

Using destinations in workflows

You can send data to Destinations in Node.js code steps, too, using $.send functions.

$.send is an object provided by Pipedream that exposes destination-specific functions like $.send.http(), $.send.s3(), and more. This allows you to send data to destinations programmatically, if you need more control than the default actions provide.

Let's use $.send.http() to send an HTTP POST request like we did in the Action example above. Add a new action, then search for "Run custom code":

Create a new HTTP endpoint URL (try creating a new Pipedream workflow and adding an HTTP trigger), and add the code below to your code step, with the URL you created:

export default defineComponent({
  async run({ steps, $}) {
    $.send.http({
      method: "POST",
      url: "[YOUR URL HERE]",
      data: {
        name: "Luke Skywalker",
      },
    });
  }
})

See the docs for the HTTP destination to learn more about all the options you can pass to the $.send.http() function.

Again, it's important to remember that Destination delivery is asynchronous. If you iterate over an array of values and send an HTTP request for each:

export default defineComponent({
  async run({ steps, $}) {
    const names = ["Luke", "Han", "Leia", "Obi Wan"];
    for (const name of names) {
      $.send.http({
        method: "POST",
        url: "[YOUR URL HERE]",
        data: {
          name,
        },
      });
    }
  }
})

you won't have to await the execution of the HTTP requests in your workflow. We'll collect every $.send.http() call and defer those HTTP requests, sending them after your workflow finishes.

Using destinations in actions

If you're authoring a component action, you can deliver data to destinations, too. $.send isn't directly available to actions like it is for workflow code steps. Instead, you use $.send to access the destination-specific functions:

export default {
  name: "Action Demo",
  key: "action_demo",
  version: "0.0.1",
  type: "action",
  async run({ $ }) {
    $.send.http({
      method: "POST",
      url: "[YOUR URL HERE]",
      data: {
        name: "Luke Skywalker",
      },
    });
  }
}

See the component action API docs for more details.

Asynchronous Delivery

Events are delivered to destinations asynchronously — that is, separate from the execution of your workflow. This means you're not waiting for network or connection I/O in the middle of your function, which can be costly.

Some destination payloads, like HTTP, are delivered within seconds. For other destinations, like S3 and SQL, we collect individual events into a batch and send the batch to the destination. See the docs for a specific destination for the relevant batch delivery frequency.

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