# faucet [![Crates.io](https://img.shields.io/crates/v/faucet-server.svg)](https://crates.io/crates/faucet-server) [![test](https://github.com/ixpantia/faucet/actions/workflows/test.yaml/badge.svg?branch=main)](https://github.com/ixpantia/faucet/actions/workflows/test.yaml) Scale, deploy and route Plumber APIs and Shiny applications with ease and efficiency. ## Summary Welcome to faucet, the most feature complete Shiny Application and Plumber API deployment platform. faucet features load balancing, routing, logging, replication, and more all in one place; unifying your workflow for deploying R based applications. ## Features - **High Performance:** faucet is designed with speed in mind, leveraging Rust's performance benefits to ensure your R applications run smoothly and efficiently. - **Load Balancing:** Choose between Round Robin and IP Hash load balancing strategies to distribute incoming requests among multiple instances, optimizing resource utilization. - **Replicas:** Easily scale your Plumber APIs and Shiny Applications by running multiple replicas, allowing for improved performance and increased availability. - **Simplified Deployment:** faucet simplifies the deployment process, making it a breeze to get your R applications up and running quickly. - **Asynchronous & Concurrent:** faucet leverages asynchronous and concurrent processing, ensuring optimal utilization of resources and responsive handling of requests. - **Routing**: Run multiple Shiny Applications, Plumber APIs, Quarto Documents on a single server with our easy to configure router. ## Usage ### Get some help To display the help message, run the following command: ```bash faucet --help ``` ### Start a Plumber API To start a plumber API, you will simply need to specify the directory containing the `'plumber.R'` file. faucet will automatically detect the file and start the API. ```bash faucet start --dir /path/to/plumber/api ``` The server will automatically listen on port `3838` by default. To change the host and port, use the `--host` flag to specify the socket address to bind to the service. ```bash faucet start --dir /path/to/plumber/api --host 0.0.0.0:3000 ``` By default faucet will start as many workers as there are logical cores on the machine. To specify the number of workers, use the `--workers` flag. ```bash faucet start --dir /path/to/plumber/api --workers 4 ``` ### Start a Shiny Application To start a Shiny Application, you will simply need to specify the directory containing the `'app.R'` file. faucet will automatically detect the file and start the application. ```bash faucet start --dir /path/to/shiny/app ``` The server will automatically listen on port `3838` by default. To change the host and port, use the `--host` flag to specify the socket address to bind to the service. ```bash faucet start --dir /path/to/shiny/app --host 0.0.0.0:3000 ``` By default faucet will start as many workers as there are logical cores on the machine. To specify the number of workers, use the `--workers` flag. ```bash faucet start --dir /path/to/shiny/app --workers 4 ``` > **Note:** On Shiny applications, faucet will be forced to use IP Hash load balancing. This is because Shiny applications require a persistent connection between the client and the server. If Round Robin load balancing is used, the client will be redirected to a different instance on each request, causing the connection to be lost. ### Pick a Load Balancing Strategy for Plumber APIs faucet supports two load balancing strategies for Plumber APIs: Round Robin and IP Hash. By default, faucet will use Round Robin load balancing. To change the strategy, use the `--strategy` flag. ```bash faucet start --dir /path/to/plumber/api --strategy ip-hash ``` ### Explicitly Set the Type of Application By default, faucet will try to detect the type of application based on the files in the specified directory. If you want to explicitly set the type of application, use the `--type` flag. For Plumber applications: ```bash faucet start --dir /path/to/plumber/api --type plumber ``` For Shiny applications: ```bash faucet start --dir /path/to/shiny/app --type shiny ``` For Quarto applications: ```bash faucet start --qmd /path/to/example.qmd --type quarto-shiny ``` If you are working with a Quarto document, it must be explicitly specified using the `--qmd` flag and the `--type quarto-shiny` option. ## With Nginx / Reverse Proxy If you want to run multiple faucet instances behind a reverse proxy, or you want to enable HTTPS, you may use Nginx or any other reverse proxy. However, to make sure faucet correctly detects the client IP address, you will need to set the `X-Forwarded-For` header or the `X-Real-IP` header. ### Nginx ```nginx server { listen 80; server_name example.com; location / { proxy_pass http://...; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; ... } } ``` Additionally, when running faucet, you will need to set the `-i` / `--ip-from` flat to either `x-forwarded-for` or `x-real-ip` depending on which header you set in Nginx. ```bash faucet start --dir /path/to/plumber/api --ip-from x-forwarded-for ``` ## Installation ### Option 1: Binary Download (Linux) Download the latest release of faucet for Linux from the [GitHub Releases page](https://github.com/ixpantia/faucet/releases). This should work with most Linux distributions. ```bash FAUCET_VERSION="v1.1.0" wget https://github.com/ixpantia/faucet/releases/download/$FAUCET_VERSION/faucet-x86_64-unknown-linux-musl -O faucet # Make the binary executable chmod +x faucet # Move the binary to a directory in your PATH (e.g., user local bin) mv faucet ~/.local/bin ``` ### Option 2: Install with Cargo (Linux, macOS, Windows) Install faucet with Cargo, Rust's package manager. 1. Install Rust by following the instructions [here](https://www.rust-lang.org/tools/install). ```bash curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh ``` 2. Install faucet with Cargo. ```bash cargo install faucet-server --version ^1.1 ``` ### Option 3: Build from Source (Linux, macOS, Windows) 1. Install Rust by following the instructions [here](https://www.rust-lang.org/tools/install). ```bash curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh ``` 2. Clone the faucet repository. ```bash git clone https://github.com/ixpantia/faucet.git ``` 3. Build faucet with Cargo. ```bash cargo install --path . ``` ## Contributing If you want to contribute to `faucet` please read the [CONTRIBUTING.md](./CONTRIBUTING.md) document.