Programming language: Go
License: MIT License
Latest version: v2.0.1

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Semaphore CI

Take control of your data, connect with anything, and expose it anywhere through protocols such as HTTP, GraphQL, and gRPC!

Create advanced and high performing data flows and expose them through endpoints over multiple protocols such as HTTP, GraphQL, and gRPC. Create custom extensions or use the availability of custom functions and protocol implementations.

Key features of Semaphore are:

  • ๐Ÿ”— Connect with anything Use the right tool for the job. Semaphore supports various protocols out of the box with the ability to supporting additional protocols through modules. Endpoints could be created to expose a single flow through multiple protocols.

  • ๐Ÿš€ Blazing fast Semaphore scales up to your needs. Branches are created to execute resources concurrently. Branches are based on dependencies between resources made through references or hard coded values. Creating high-performance flows is almost boringly easy.

  • โœ… Transactional flows Make sure that your data stays consistent. Rollback data when an unexpected response is returned from one of your services. References to returned values could be made allowing to ensure that your customers have the best experience possible.

  • โ›ฉ๏ธ Conditional logic Only call services when needed. Conditional expressions ensure that resources are only executed when needed. Conditions grow to your needs. Whether you want to keep things simple or need to achieve complex goals.

  • ๐ŸŒ Adapts to your environment Semaphore integrates with your existing system(s). Define flows through simple and strict typed definitions. Use your already existing schema definitions such as Protobuffers. Or extend Semaphore with custom modules and proprietary software. Integrate services through flow definitions and create a great experience for your customers and your teams.



Want to take your systems to the next level? Semaphore Enterprise allows users to fully embrace the power their data flows. Additional modules and tooling allows users to build more complex environments and helps running Semaphore in production.

Feel free to request for more information or a demo by sending us a email at: [email protected]

Documentation and Getting Started

Documentation is available at GitBook.

If you are new to Semaphore and want to get started with building flows, please check out the available ๐Ÿš€ Examples. Feel free to reach out to the community on Discord or by opening a new issue.

Data streams inside Semaphore are defined as flows. A flow could manipulate, deconstruct, and forwarded data in between resources. Flows are exposed through endpoints. Flows are generic and could handle different protocols and codecs from a single flow. All flows are strictly typed through schema definitions. These schemas define the contracts provided and accepted by services.

Currently, are only protobuffers supported but more schema definitions are planned to be supported in the future. Feel free to open a new issue to discuss which schema definition you require.

endpoint "checkout" "http" {
    endpoint = "/cart/checkout"
    method = "POST"

endpoint "checkout" "grpc" {
    package = "webshop.cart"
    service = "Payment"
    method = "Checkout"

flow "checkout" {
    input "services.Order" {}

    resource "product" {
        request "services.Warehouse" "GetProduct" {
            product = "{{ input:product }}"

    resource "shipping" {
        request "services.Warehouse" "Send" {
            user = "{{ input:user }}"

    output "services.OrderResult" {
        status = "{{ shipping:status }}"
        product = "{{ product:. }}"

Installing Semaphore

There are variouse sources available to download and install the โšก Semaphore CLI. For more information and install methods please check out the installing section.

$ curl https://raw.githubusercontent.com/jexia/semaphore/master/install.sh | sh

Install Semaphore

Developing Semaphore

If you wish to work on Semaphore itself or any of its built-in systems, you'll first need Go installed on your machine. Go version 1.13.7+ is required.

For local dev first make sure Go is properly installed, including setting up a GOPATH. Ensure that $GOPATH/bin is in your path as some distributions bundle old version of build tools. Next, clone this repository. Semaphore uses Go Modules, so it is recommended that you clone the repository outside of the GOPATH. You can then download any required build tools by bootstrapping your environment:

$ make bootstrap

To compile a development version of Semaphore, run make or make dev. This will put the Semaphore binary in the bin folders:

$ make dev
$ bin/semaphore

To run tests, type make test. If this exits with exit status 0, then everything is working!

$ make test


Thank you for your interest in contributing to Semaphore! โค Check out the open projects and/or issues and feel free to join any ongoing discussion.

Everyone is welcome to contribute, whether it's in the form of code, documentation, bug reports, feature requests, or anything else. We encourage you to experiment with the project and make contributions to help evolve it to meet your needs!

See the contributing guide for more details.