Restate - Building resilient applications made easy!

Restate is a system for easily building resilient applications using distributed durable async/await. This repository contains the Restate server and CLI.

The basic primitives Restate offers to simplify application development are the following:

reliable execution: user code will always run to completion. Intermediate failures result in re-tries that use the durable execution mechanism to recover partial progress and not duplicate already executed steps.
suspending user code: long-running user code suspends when awaiting on a promise and resume when that promise is resolved.
reliable communication: user code communicates with exactly-once semantics. Restate reliably delivers messages and anchors both sender and receiver in the durable execution to ensure no losses or duplicates can happen.
durable timers: user code can sleep (and suspend) or schedule calls for later.
isolation: user code can be keyed, which makes Restate scheduled them to obey single-writer-per-key semantics.
consistent state: keyed user code can attach key/value state, which is eagerly pushed into handlers during invocation, and written back upon completion. This is particularly efficient for FaaS deployments (stateful serverless, yay!).
observability & introspection: Restate automatically generates Open Telemetry traces for the interactions between handlers and gives you a SQL shell to query the distributed state of the application.

Check our GitHub org or the docs for further details.

SDKs

Restate supports the following SDKs:

Building Restate

In order to build Restate locally follow the build instructions.

Running Restate

You can start the runtime via:

just run --bin restate-server --release

or the latest release via docker:

docker run --name restate --rm --network=host docker.io/restatedev/restate

In order to change the log level, configure the RUST_LOG env variable respectively. For example, to enable debug mode for Restate crates:

RUST_LOG=info,restate=debug just run --bin restate-server --release

Registering Restate services

After the runtime is running on localhost:9070, you can register a service running on localhost:9080 via curl:

curl -X POST localhost:9070/endpoints -H 'content-type: application/json' -d '{"uri": "http://localhost:9080"}'

For more information check how to register services.

Invoking a Restate service

After registering a service you can invoke a service via via HTTP/JSON:

curl -X POST localhost:8080/counter.Counter/GetAndAdd -H 'content-type: application/json' -d '{"counter_name": "foobar", "value": 10 }'