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# Kappa (Klarna Application Analytics)
> Keep a huge Erlang code base, developed by multiple teams, in a manageable state.

[![Build Status][ci-image]][ci-url]
[![License][license-image]][license-url]
[![Developed at Klarna][klarna-image]][klarna-url]

## Features

### Code and database table ownership

Kappa can tell you which team owns this particular app / module /
database table and how they can be contacted (e.g. to send an alarm).

### Application API modules

Restrict inter-app calls to only a set of API-modules. Calls from one
app to other app's _private_ modules are not allowed.

### Restricted record fields usage

Direct access to records defined in header files makes it hard to
change the record's structure. Kappa allows only a defined set of
modules to access specific record's fields directly.

### Code Layers

Divide your apps into multiple layers (e.g. external interfaces and
APIs / business logic layer / database level / system utilities /
test-only / external dependencies, etc.) and apply restrictions on
calls between applications that belong to different layers (allowed at
all?  if allowed, in which direction?)

> :warning: Most of the checks rely on the presence of `debug_info` compiler option!

## Get Started

rebar3 escriptize
    _build/default/bin/kappa

Usage: kappa [<mode>] [-a [<apps>]] [-m [<mods>]] [-x [<exclusive>]]
             [-f [<functions>]] [-v [<violations>]] [-r [<reverse>]]
             [-c [<count>]] [-g [<graph>]] [-G [<graph_file>]]
             [-p [<path>]] [-?] [name ...]

<mode>            api:     report non api call violations
                      layers:  report layer violations
                      all:     report api and layer violations
                      summary: print a one line summary of all violations in
                               the system. Options other than -p are ignored.
                               The format is:
                               <time> <non api calls> <layer violations> <sum> [default: all]
    -a, --apps        List applications violating invariants [default: false]
    -m, --mods        List modules violating invariants [default: true]
    -x, --exclusive   Only report violations where the module is a part of
                          the analyzed set [default: false]
    -f, --functions   Draw graph over functions.  Use carefully.
                          Only works with -m [default: false]
    -v, --violations  Show only violations in graph. [default: false]
    -r, --reverse     Report callers to the mod/app rather than callees
                      [default: false]
    -c, --count       Report only the number of warnings [default: false]
    -g, --graph       Store a graph centered around the mods/apps.
                          Default file path is '/tmp/graph.svg' [default: false]
    -G, --graph-file  Store a graph centered around the mods/apps at
                      specified location. [default: undefined]
    -p, --path        Analyze another system rather than the current.
                          Default is current directory [default: Current Directory]
    -?, --help        Show usage screen
    names             List of applications or modules to check.
                          Default is to check the whole system

## Configuration

Kappa's configuration is loaded from 4 files:

* `architecture_file` - where all the layers and applications are
  listed with their owner IDs and API modules
* `ownership_file` - with all the teams and their contact details
* `db_ownership_file` - where all the database tables are listed with
  their owners
* `record_field_use_file` - where all the shared records are listed
  together with their access modules and allowed exceptions

There are 2 additional files where approved rule violations can be listed:

* `approved_api_violations_file` - where we can temporary allow calls
  from one application to another application's non-API module
* `approved_layer_violations_file` - where we can temporary allow
  calls between applications belonging to layers, which are normally
  not allowed to communicate.

Their location can be configured via `kappa`'s application env, but
some functions can accept their location as an argument.

## Register as an API

Each application needs to have a block in `architecture_file` with an
`application` and `owner` keys.  Each API module also needs to be
listed under its application. Example:

[ {application, monitor}
    , {owner, operations}
    , {api, [ alarm, log ]}
    ].

Where __owner__ is the name of your team, __application__ is the name
of application your api module belongs to and __api__ is a list of all
API modules.

### Add API exceptions

You can specify ignore rules to reduce the number of modules in the
api section and to avoid manually adding them. They are added to
`kappa`'s application env under `always_api` key.

Several types of rules are supported:

* ignore app_name: `app_name`. This will make modules with the same
  name as their applications be treated as API modules.
* ignore by suffix: `{suffix, "api"}`. This will make all modules with
  names ending in `api` be treated as API modules.
* ignore by prefix: `{prefix, "api"}`. This will make all modules with
  names starting with `api` be treated as API modules.
* ignore by directory: `{dir, "api"}`. This will make all modules,
  which source files are stored in `src/api` subdirectory be treated as
  API modules.
* ignore by behaviour: `{behaviour, api}`. This will make all modules
  with `-behaviour(api)` be treated as API modules.

Full example:

{env, [
            {always_api, [
                       app_name,
                       {behaviour, api},
                       {dir, "api"}
                     ]
            }
          ]
    }

## How to contribute

See our guide on [contributing](.github/CONTRIBUTING.md).

## Release History

See our [changelog](CHANGELOG.md).

## License

For license details, see the [LICENSE](LICENSE) file in the root of this project.

[ci-image]: https://img.shields.io/badge/build-passing-brightgreen?style=flat-square
[ci-url]: https://github.com/klarna-incubator/kappa
[license-image]: https://img.shields.io/badge/license-Apache%202-blue?style=flat-square
[license-url]: http://www.apache.org/licenses/LICENSE-2.0
[klarna-image]: https://img.shields.io/badge/%20-Developed%20at%20Klarna-black?labelColor=ffb3c7&style=flat-square&logo=data:image/png;base64,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
[klarna-url]: https://klarna.github.io

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