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Steps are building blocks for logic in functions. They are individually retried, and only run once on success. They allow you to easily write complex logic in a single function.
This function does one thing. When a app/user.signup event is triggered, the function sends a welcome email. This is billed as 1 step.
export default inngest.createFunction(
{ id: "send-welcome-email" },
{ event: "app/user.signup" },
async ({ event, step }) => {
await emailAPI.send({
template: "welcome",
to: event.user.email,
});
}
);In this example, when a app/user.signup event is triggered the function sends a welcome email, waits 3 days, then sends another email - without any extra queues, state, or functions. This is billed as 3 steps.
export default inngest.createFunction(
{ id: "new-signup-drip-campaign" },
{ event: "app/user.signup" },
async ({ event, step }) => {
await step.run("send-welcome-email", async () => {
await emailAPI.send({
template: "welcome",
to: event.user.email,
});
});
await step.sleep("wait-before-tips", "3 days");
await step.run("send-new-user-tips-email", async () => {
await emailAPI.send({
template: "new-user-tips",
to: event.user.email,
});
});
}
);You can use the volume of messages that you currently process in your queues to approximate your step usage. Additionally, add the number of cron jobs that you run if you aim to use Inngest for scheduling.
Get in touch if you want help estimating advanced use cases.
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| Features | ||||
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| Step functions | ||||
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| Concurrency controls | ||||
| Custom failure handlers | ||||
| Parallel steps | ||||
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A function is defined with the Inngest SDK using createFunction or similar. A function can be triggered by an event or run on a schedule (cron).
Functions can contain multiple “steps” to reliably run parts of your function or add functionality like sleeping/pausing a function for a period of time. You can define a step using available tools in our SDKs like step.run, step.sleep,step.sleepUntil and step.waitForEvent. Read more in our documentation.
Your functions are hosted in your existing application on any platform. We’ll call your functions securely via HTTP request on-demand.
Each function step is called as a separate HTTP request enabling things like having a function sleep for minutes, hours or days.
As Inngest runs your function any time an event is received, you may have any number of events received within a short period of time (e.g. 10ms). Inngest can run all of these functions concurrently (in parallel). Our free tier allows for up to concurrent functions at a time. Our paid plans offer substantial concurrency to enable you to parallelize workloads and keep your system efficient and performant.
Sleeps and other pauses do not count towards your concurrency limit as your function isn't running while waiting.
See more details at usage limits page.
Yes! We would be happy to demo Inngest for you and understand the needs of your team. Contact us here to set up a call.
We currently have an SDK for JavaScript/TypeScript, but plan to expand to Go, Python and others in the future. Share your feedback or up vote an specific language SDK here.
Inngest functions are invoked via https, so each function step can run as long as your platform or server supports, for example, Vercel's Pro plan runs functions for up to 60 seconds which means that if your function needs to run longer than that, you can break it up into multiple steps (see: What is a function step?).
See more details on our usage limits documentation.
Yep! Any number of functions can be triggered by the same event enabling useful design patterns like fan-out.
Nope. You can send any event to Inngest via and SDK or a webhook at any scale. We only charge for the code that you run: the “function steps.” We encourage teams to send any/all events to the Inngest platform which then can allow them to add new functions at any time.
Not yet, but it's in our roadmap. If you have a specific roadmap in mind or would like to be one of the first people to have access, shoot us a message.
Not yet, but we plan to offer this in the future. If you're interested in self-hosting Inngest, reach out with your needs.
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