GitHub - suborbital/hive: A powerful job scheduler for Go & WASM

Hive is a fast, performant job scheduling system, plain and simple. Hive is designed to be flexible, with the ability to run embedded in your Go applications or as a standalone FaaS server, and has early support for running WASM/WASI bundles.

Hive transparently spawns workers to process jobs, with each worker processing jobs in sequence. Hive jobs are arbitrary data, and they return arbitrary data (or an error). Jobs are scheduled by clients, and their results can be retreived at a later time.

Hive also has early (read: alpha) support for acting as a Functions-as-a-Service system. Hive can be run as a server, accepting jobs from HTTP/S and making the job results available to be fetched later. See faas for details. gRPC support is planned.

Hive has very early (read: pre-alpha) support for WASM-packaged runnables. This is actively being worked on, as WASM is an exciting new standard that makes cross-language and cross-platform code just a bit easier :) See wasm and the hivew toolchain for details.

The Basics

First, install Hive:

go get github.com/suborbital/hive/hive

And then get started by defining something Runnable:

type generic struct{}

// Run runs a generic job
func (g generic) Run(job hive.Job, run hive.RunFunc) (interface{}, error) {
	fmt.Println("doing job:", job.String()) // get the string value of the job's data

	// do your work here

	return fmt.Sprintf("finished %s", job.String()), nil
}

// OnStart is called when Hive starts up a worker to handle jobs,
// and allows the Runnable to set itself up before receiving jobs
func (g generic) OnStart() error {
	return nil
}

A Runnable is something that can take care of a job, all it needs to do is conform to the Runnable interface as you see above.

Once you have a Runnable, create a hive, register it, and Do some work:

package main

import (
	"fmt"
	"log"

	"github.com/suborbital/hive/hive"
)

func main() {
	h := hive.New()

	h.Handle("generic", generic{})

	r := h.Do(h.Job("generic", "hard work"))

	res, err := r.Then()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("done!", res.(string))
}

When you Do some work, you get a Result. A result is like a Rust future or a JavaScript promise, it is something you can get the job's result from once it is finished.

Calling Then() will block until the job is complete, and then give you the return value from the Runnable's Run. Make sense?

Hive has some very powerful capabilities, visit the get started guide to learn more.

Hive is being actively developed and has planned improvements, including optimized memory usage, library stability, data persistence, and more. Cheers!

Copyright Suborbital contributors 2020