Update README.md

README.md

@@ -3,21 +3,22 @@
 [![Build](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml/badge.svg)](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml)
 
 This is a Golang backend implementation for a REST and GraphQL API according to the [ClusterCockpit specifications](https://github.com/ClusterCockpit/cc-specifications).
-It also includes a web interface for ClusterCockpit based on the components implemented in
-[cc-frontend](https://github.com/ClusterCockpit/cc-frontend), which is included as a git submodule.
+It also includes a web interface for ClusterCockpit.
 This implementation replaces the previous PHP Symfony based ClusterCockpit web-interface.
+[Here](https://github.com/ClusterCockpit/ClusterCockpit/wiki/Why-we-switched-from-PHP-Symfony-to-a-Golang-based-solution) is a discussion of the reasons why we switched from PHP Symfony to a Golang based solution.
 
 ## Overview
 
 This is a golang web backend for the ClusterCockpit job-specific performance monitoring framework.
 It provides a REST API for integrating ClusterCockpit with a HPC cluster batch system and external analysis scripts.
 Data exchange between the web frontend and backend is based on a GraphQL API.
-The web frontend is also served by the backend using [Svelte](https://svelte.dev/) components implemented in [cc-frontend](https://github.com/ClusterCockpit/cc-frontend).
+The web frontend is also served by the backend using [Svelte](https://svelte.dev/) components.
 Layout and styling is based on [Bootstrap 5](https://getbootstrap.com/) using [Bootstrap Icons](https://icons.getbootstrap.com/).
-The backend uses [SQLite 3](https://sqlite.org/) as relational SQL database by default. It can optionally use a MySQL/MariaDB database server.
-Finished batch jobs are stored in a so called job archive following [this specification](https://github.com/ClusterCockpit/cc-specifications/tree/master/job-archive).
+The backend uses [SQLite 3](https://sqlite.org/) as relational SQL database by default.
+It can optionally use a MySQL/MariaDB database server.
+Finished batch jobs are stored in a file-based job archive following [this specification](https://github.com/ClusterCockpit/cc-specifications/tree/master/job-archive).
 The backend supports authentication using local accounts or an external LDAP directory.
-Authorization for APIs is implemented using [JWT](https://jwt.io/) tokens created with  public/private key encryption.
+Authorization for APIs is implemented using [JWT](https://jwt.io/) tokens created with public/private key encryption.
 
 ## Demo Setup
 
@@ -25,30 +26,28 @@ We provide a shell skript that downloads demo data and automatically builds and
 You need `wget`, `go`, and `yarn` in your path to start the demo. The demo will download 32MB of data (223MB on disk).
 
 ```sh
-# The frontend is a submodule, so use `--recursive`
-git clone --recursive git@github.com:ClusterCockpit/cc-backend.git
+git clone git@github.com:ClusterCockpit/cc-backend.git
 
 ./startDemo.sh
 ```
-You can access the web interface at http://localhost:8080. Credentials for login: `demo:AdminDev`. Please note that some views do not work without a metric backend (e.g., the Systems view).
+You can access the web interface at http://localhost:8080.
+Credentials for login: `demo:AdminDev`.
+Please note that some views do not work without a metric backend (e.g., the Systems view).
 
 ## Howto Build and Run
 
 ```sh
-# The frontend is a submodule, so use `--recursive`
-git clone --recursive git@github.com:ClusterCockpit/cc-backend.git
+git clone git@github.com:ClusterCockpit/cc-backend.git
 
 # Prepare frontend
-cd ./cc-backend/frontend
+cd ./cc-backend/web/frontend
 yarn install
 yarn build
 
 cd ..
 go get
-go build
+go build cmd/cc-backend
 
-# The job-archive directory must be organised the same way as
-# as for the regular ClusterCockpit.
 ln -s <your-existing-job-archive> ./var/job-archive
 
 # Create empty job.db (Will be initialized as SQLite3 database)
@@ -56,6 +55,7 @@ touch ./var/job.db
 
 # EDIT THE .env FILE BEFORE YOU DEPLOY (Change the secrets)!
 # If authentication is disabled, it can be empty.
+cp configs/env-template.txt  .env
 vim ./.env
 
 # This will first initialize the job.db database by traversing all
@@ -71,57 +71,40 @@ vim ./.env
 ```
 ### Run as systemd daemon
 
-In order to run this program as a daemon, look at [utils/systemd/README.md](./utils/systemd/README.md) where a systemd unit file and more explanation is provided.
+In order to run this program as a daemon, cc-backend ships with an [example systemd setup](./init/README.md).
 
 ## Configuration and Setup
 
-cc-backend can be used as a local web-interface for an existing job archive or
-as a general web-interface server for a live ClusterCockpit Monitoring
-framework.
+cc-backend can be used as a local web-interface for an existing job archive or as a general web-interface server for a live ClusterCockpit Monitoring framework.
 
-Create your job-archive according to [this specification](https://github.com/ClusterCockpit/cc-specifications). At least
-one cluster with a valid `cluster.json` file is required. Having no jobs in the
-job-archive at all is fine. You may use the sample job-archive available for
-download [in cc-docker/develop](https://github.com/ClusterCockpit/cc-docker/tree/develop).
+Create your job-archive according to [this specification](https://github.com/ClusterCockpit/cc-specifications/tree/master/job-archive).
+At least one cluster with a valid `cluster.json` file is required.
+Having no jobs in the job-archive at all is fine.
 
 ### Configuration
 
 A config file in the JSON format can be provided using `--config` to override the defaults.
-Look at the beginning of `server.go` for the defaults and consequently the format of the configuration file.
+You find documentation of all supported configuration and command line options [here](./configs.README.md).
 
 ### Update GraphQL schema
 
-This project uses [gqlgen](https://github.com/99designs/gqlgen) for the GraphQL
-API. The schema can be found in `./graph/schema.graphqls`. After changing it,
-you need to run `go run github.com/99designs/gqlgen` which will update
-`graph/model`. In case new resolvers are needed, they will be inserted into
-`graph/schema.resolvers.go`, where you will need to implement them.
+This project uses [gqlgen](https://github.com/99designs/gqlgen) for the GraphQL API.
+The schema can be found in `./api/schema.graphqls`.
+After changing it, you need to run `go run github.com/99designs/gqlgen` which will update `./internal/graph/model`.
+In case new resolvers are needed, they will be inserted into `./internal/graph/schema.resolvers.go`, where you will need to implement them.
 
 ## Project Structure
 
-- `api/` contains the REST API. The routes defined there should be called whenever a job starts/stops. The API is documented in the OpenAPI 3.0 format in [./api/openapi.yaml](./api/openapi.yaml).
-- `auth/` is where the (optional) authentication middleware can be found, which adds the currently authenticated user to the request context. The `user` table is created and managed here as well.
-  - `auth/ldap.go` contains everything to do with automatically syncing and authenticating users form an LDAP server.
-- `config` handles the `cluster.json` files and the user-specific configurations (changeable via GraphQL) for the Web-UI such as the selected metrics etc.
-- `frontend` is a submodule, this is where the Svelte based frontend resides.
-- `graph/generated` should *not* be touched.
-- `graph/model` contains all types defined in the GraphQL schema not manually defined in `schema/`. Manually defined types have to be listed in `gqlgen.yml`.
-- `graph/schema.graphqls` contains the GraphQL schema. Whenever you change it, you should call `go run github.com/99designs/gqlgen`.
-- `graph/` contains the resolvers and handlers for the GraphQL API. Function signatures in `graph/schema.resolvers.go` are automatically generated.
-- `metricdata/` handles getting and archiving the metrics associated with a job.
-  - `metricdata/metricdata.go` defines the interface `MetricDataRepository` and provides functions to the GraphQL and REST API for accessing a jobs metrics which automatically take care of selecting the source for the metrics (the archive or one of the metric data repositories).
-  - `metricdata/archive.go` provides functions for fetching metrics from the job-archive and archiving a job to the job-archive.
-  - `metricdata/cc-metric-store.go` contains an implementation of the `MetricDataRepository` interface which can fetch data from an [cc-metric-store](https://github.com/ClusterCockpit/cc-metric-store)
-  - `metricdata/influxdb-v2` contains an implementation of the `MetricDataRepository` interface which can fetch data from an InfluxDBv2 database. It is currently disabled and out of date and can not be used as of writing.
-- `repository/` all SQL related stuff.
-- `repository/init.go` initializes the `job` (and `tag` and `jobtag`) table if the `--init-db` flag is provided. Not only is the table created in the correct schema, but the job-archive is traversed as well.
-- `schema/` contains type definitions used all over this project extracted in this package as Go disallows cyclic dependencies between packages.
-  - `schema/float.go` contains a custom `float64` type which overwrites JSON and GraphQL Marshaling/Unmarshalling. This is needed because a regular optional `Float` in GraphQL will map to `*float64` types in Go. Wrapping every single metric value in an allocation would be a lot of overhead.
-  - `schema/job.go` provides the types representing a job and its resources. Those can be used as type for a `meta.json` file and/or a row in the `job` table.
-- `templates/` is mostly full of HTML templates and a small helper go module.
-- `utils/systemd` describes how to deploy/install this as a systemd service
-- `test/` rudimentery tests.
-- `utils/`
-- `.env` *must* be changed before you deploy this. It contains a Base64 encoded [Ed25519](https://en.wikipedia.org/wiki/EdDSA) key-pair, the secret used for sessions and the password to the LDAP server if LDAP authentication is enabled.
+- `api/` contains the API schema files for the REST and GraphQL APIs. The REST API is documented in the OpenAPI 3.0 format in [./api/openapi.yaml](./api/openapi.yaml).
+- `cmd/cc-backend` contains `main.go` for the main application.
+- `configs/` contains documentation about configuration and command line options and required environment variables. An example configuration file is provided.
+- `init/` contains an example systemd setup for production use.
+- `internal/` contains library source code that is not intended to be used by others.
+- `pkg/` contains go packages that can also be used by other projects.
+- `test/` Test apps and test data.
+- `tools/` contains supporting tools for cc-backend. At the moment this is a small application to generate a compatible JWT keypair.
+- `web/` Server side templates and frontend related files:
+   - `templates` Serverside go templates
+   - `frontend` Svelte components and static assets for frontend UI
 - `gqlgen.yml` configures the behaviour and generation of [gqlgen](https://github.com/99designs/gqlgen).
-- `server.go` contains the main function and starts the actual http server.
+- `startDemo.sh` is a shell script that sets up demo data, and builds and starts cc-backend.