jakejscott / sdk-core

Core Temporal SDK that can be used as a base for language specific Temporal SDKs

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Core SDK that can be used as a base for all other Temporal SDKs.

Getting started

See the Architecture doc for some high-level information.


  • Protobuf compiler


This repo is composed of multiple crates:

  • temporal-sdk-core-protos ./sdk-core-protos - Holds the generated proto code and extensions
  • temporal-client ./client - Defines client(s) for interacting with the Temporal gRPC service
  • temporal-sdk-core-api ./core-api - Defines the API surface exposed by Core
  • temporal-sdk-core ./core - The Core implementation
  • temporal-sdk ./sdk - A (currently prototype) Rust SDK built on top of Core. Used for testing.
  • temporal-sdk-core-bridge-ffi ./bridge-ffi - C API wrapper for Core
  • rustfsm ./fsm - Implements a procedural macro used by core for defining state machines (contains subcrates). It is temporal agnostic.

Visualized (dev dependencies are in blue):

Crate dependency graph

All the following commands are enforced for each pull request:

Building and testing

You can buld and test the project using cargo: cargo build cargo test

Run integ tests with cargo integ-test. You will need to already be running the server: docker-compose -f .buildkite/docker/docker-compose.yaml up


To format all code run: cargo fmt --all


We are using clippy for linting. You can run it using: cargo clippy --all -- -D warnings


The crate uses tracing to help with debugging. To enable it for a test, insert the below snippet at the start of the test. By default, tracing data is output to stdout in a (reasonably) pretty manner.

let s = info_span!("Test start");
let _enter = s.enter();

The passed in options to initialization can be customized to export to an OTel collector, etc.

To run integ tests with OTel collection on, you can use integ-with-otel.sh. You will want to make sure you are running the collector via docker, which can be done like so: docker-compose -f .buildkite/docker/docker-compose.yaml -f .buildkite/docker/docker-compose-telem.yaml up

If you are working on a language SDK, you are expected to initialize tracing early in your main equivalent.

Proto files

This repo uses a subtree for upstream protobuf files. The path protos/api_upstream is a subtree. To update it, use: git subtree pull --prefix protos/api_upstream/ git://github.com/temporalio/api.git master --squash

Fetching Histories

Tests which would like to replay stored histories rely on that history being made available in binary format. You can fetch histories in that format like so (from a local docker server):

cargo run --bin histfetch {workflow_id} [{run_id}]

You can change the TEMPORAL_SERVICE_ADDRESS env var to fetch from a different address.

Style Guidelines

Error handling

Any error which is returned from a public interface should be well-typed, and we use thiserror for that purpose.

Errors returned from things only used in testing are free to use anyhow for less verbosity.

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Core Temporal SDK that can be used as a base for language specific Temporal SDKs



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