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.

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

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 --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 }'

For more information check how to invoke services.