> This doc is a WIP and will be expanded shortly. > > In the meantime, please consider looking at the extensive docs in the [Fasten Docs Repository](https://github.com/fastenhealth/docs/tree/main/technical) # Tech Stack Fasten is made up of a handful of different components. Here's a summary of the technologies & languages used in Fasten: **Frontend** - NodeJS `v18.9.0` - Yarn `1.22.19` - Angular `v14.1.3` **Backend** - Go `v1.18.3` **Misc** - Docker `v20.10.17` ## Setup If you're on a Mac, you can run the following commands to install the necessary software to get setup: ```bash brew install node npm install -g @angular/cli@14.1.3 npm install -g yarn brew install go brew install docker ``` # Running Tests Before making changes to Fasten, you'll want to run the test suites to ensure that your environment is setup correctly: ```bash make test # if you only want to run the frontend tests (Angular), you can run: make frontend-test # alternatively, if you only care about backend (Go) tests, you can run: make backend-test ``` # Start Development Environment To run Fasten from source, you'll need to create 3 separate processes: - Angular Frontend - Go Backend - CouchDB Database First we'll create a development config file (`config.dev.yaml`) ```yaml version: 1 web: listen: port: 9090 host: 0.0.0.0 basepath: '' src: frontend: path: ./dist database: location: 'fasten.db' log: file: '' #absolute or relative paths allowed, eg. web.log level: INFO ``` Next we'll start the processes described above: ```bash # In terminal #1, run the following cd frontend yarn dist -- -c [sandbox|prod] # eg. yarn dist -- -c prod # In terminal #2, run the following go mod vendor go run backend/cmd/fasten/fasten.go start --config ./config.dev.yaml --debug ``` _Note_: Fasten can run in 2 modes: sandbox or production (prod). In sandbox mode, it can only communicate with test servers (full of synthetic health data). Now you can open a browser to `http://localhost:9090` to see the Fasten UI. ## Important URL's The following URL's and credentials may be helpful as you're developing - http://localhost:9090/web/dashboard - WebUI ### Credentials - WebUI: - username: `testuser` - password: `testuser` # Source Code Folder Structure The Fasten source code is organized into a handful of important folders, which we'll describe below: ## Frontend ``` ├── frontend │   ├── src │   │   ├── app │   │   │   ├── app-routing.module.ts │   │   │   ├── app.component.html │   │   │   ├── app.component.scss │   │   │   ├── app.component.spec.ts │   │   │   ├── app.component.ts │   │   │   ├── app.module.ts │   │   │   ├── components # contains shared/partial components reused on multiple pages. │   │   │   │   ├── components-sidebar │   │   │   │   ├── footer │   │   │   │   ├── header │   │   │   │   ├── list-fallback-resource │   │   │   │   ├── list-generic-resource # A component containing a table view for every FHIR resource │   │   │   │   ├── list-patient │   │   │   │   ├── resource-list # Thin shim which populates template depending on FHIR resource type │   │   │   │   ├── toast # Toast/notification component │   │   │   │   └── utilities-sidebar │   │   │   ├── models # contains classes for communicating with API's and transfering data between pages. │   │   │   ├── pages │   │   │   │   ├── auth-signin # Login/Signin page │   │   │   │   ├── auth-signup # Signup page │   │   │   │   ├── dashboard # Dashboard, visible after logging in │   │   │   │   ├── medical-sources # Medical Provider connection page │   │   │   │   ├── patient │   │   │   │   ├── resource-detail # Page displaying detailed information about FHIR resource │   │   │   │   └── source-detail # 2 column page displaying FHIR counts, and table listing FHIR resources for selected type │   │   │   ├── services │   │   │   │   ├── auth-interceptor.service.ts # service that looks for 401/403 API responses and triggers Logout │   │   │   │   ├── is-authenticated-auth-guard.ts # service that checks if user is logged in │   │   │   │   ├── fasten-api.service.ts # api service, used to commnunicate with Go backend (WILL BE REMOVED) │   │   │   │   ├── fasten-db.service.ts # db service, used to communicate with CouchDB database │   │   │   │   ├── lighthouse.service.ts # api service, used to communicate with auth-gateway (Lighthouse) │   │   │   │   └── toast.service.ts # notifications service, used to send notifications │   │   │   └── workers │   │   │   ├── queue.service.spec.ts │   │   │   ├── queue.service.ts # queue service, used to coordinate background work │   │   │   └── source-sync.worker.ts # background job (web-worker) that syncs all FHIR resources from healthcare provider │   │   ├── lib # root directory for libraries │   │   │   ├── README.md │   │   │   ├── conduit # Conduit Library - HealthCare provider communication layer (FHIR protocol) │   │   │   │   ├── fhir # contains healthcare provider specific FHIR clients │   │   │   ├── database # Database Library - PouchDB/CouchDB client, compatible with web-worker and browser env │   │   │   │   ├── plugins │   │   │   │   └── pouchdb_repository.ts │   │   │   ├── models │   │   │   │   ├── database # Classes used to store data in CouchDB │   │   │   │   ├── fasten │   │   │   │   └── lighthouse # Classes used to communicate with Lighthouse API │   │   │   └── utils │   │   ├── styles.scss # Main sylesheet ``` ## Backend The backend is incredibly simple (by design). The hope is to remove it completely if possible, allowing Fasten to be served by a CDN or minimal Nginx deployment. ```tree ├── backend │   ├── cmd │   └── pkg │   ├── config │   ├── database # contains CouchDB client, allowing creation of new Users (and associated databases) │   ├── errors │   ├── models │   └── web │   ├── handler # contains code for API endpoints │   │   ├── auth.go # authentication endpoints (create new user) │   │   ├── cors_proxy.go # CORS proxy/relay for communicating with healthcare providers who do not support CORS │   │   ├── couchdb_proxy.go # reverse proxy for CouchDB api, allowing for database API to be exposed (with limitations) │   │   └── metadata.go # API endpoint returning metadata for healthcare providers ``` ## Distribution/Docker ```tree ├── docker-compose.yml # docker-compose file which can be used to compile and run "all-in-one" image ├── Dockerfile # dockerfile for "all-in-one" image, containing frontend, backend & database ├── docker │   ├── README.md │   ├── couchdb │   │   ├── Dockerfile # dockerfile for "couchdb" only image, used for development │   │   └── local.ini │   └── rootfs # filesystem configs, used in Dockerfiles to setup s6-overlay service manager │   └── etc │   ├── cont-init.d │   │   ├── 01-timezone │   │   └── 50-couchdb-init │   └── services.d │   ├── couchdb │   └── fasten ``` # FAQ ### How do I run individual frontend tests? - ng test --include='**/base_client.spec.ts' - ng test --include='lib/**/*.spec.ts' ### How do I change the default encryption key and admin credentials - FASTEN_ISSUER_JWT_KEY - FASTEN_COUCHDB_ADMIN_USERNAME - FASTEN_COUCHDB_ADMIN_PASSWORD ### Generate JWT for local use ```bash curl -X POST http://localhost:9090/api/auth/signup -H 'Content-Type: application/json' -d '{"username":"user1","password":"user1"}' curl -X POST http://localhost:9090/api/auth/signin -H 'Content-Type: application/json' -d '{"username":"user1","password":"user1"}' curl -H "Authorization: Bearer ${JWT_TOKEN_HERE}" http://localhost:5984/_session ```