tpt-workflow
Durable execution / BPM engine — orchestrates long-running, stateful workflows across your microservices with crash-safe replay, sandboxed WASM workers, and gRPC task dispatch.
tpt-workflow
Orchestrating the complex, durable logic of your ecosystem.
tpt-workflow is a durable execution and Business Process Management (BPM) engine. While tpt-synapse handles fast, instantaneous event firing, enterprise ecosystems also need long-running, stateful business processes — a permit application, a multi-stage supply chain route, a healthcare intake process — that can take days or weeks to complete.
tpt-workflow takes the disparate microservices of your ecosystem and orchestrates them into cohesive, unbreakable workflows that survive server crashes, pause for human approval, and execute complex logic without creating spaghetti code.
Core Architecture
- Durable Execution — Workflows are written as standard code (Rust/TypeScript). The engine automatically persists workflow state at every step, so if a server crashes,
tpt-workflowreplays the workflow from the exact point of failure with no state lost. - Visual Workflow Builder — A drag-and-drop interface for non-developers (e.g. government clerks or hospital admins) to design, test, and modify business processes visually without touching code.
- Sandboxed Workers — Isolated environments that execute workflow tasks, so a memory leak or bug in one workflow can't crash the entire engine.
Tech Stack
- Workflow Engine Core: Rust, using deterministic replay and event sourcing (inspired by Temporal.io's architecture).
- Sandboxed Execution: WebAssembly (WASM) via Wasmtime/Wasmer, to safely run user-defined workflow logic and third-party plugins in strictly isolated memory spaces.
- Communication: gRPC & Protobuf for high-performance, strictly typed, low-latency communication between the engine and worker nodes.
- Visual Builder UI: tpt-appfront, rendering an interactive, infinite-canvas node graph for designing workflows, running natively on desktop and web.
Ecosystem Integration
- tpt-keystone-db — durable state store, event-sourcing the workflow history and supporting complex queries over historical workflow data.
- tpt-synapse — dispatches tasks to workers and listens for asynchronous task completions.
- tpt-identity — manages step-level permissions (e.g. "Only a Level 3 Manager with the 'Finance' attribute can approve this specific workflow step").
Status
Early scaffold stage — see TODO.md for the phased build-out plan and spec.txt for the full design spec.