A build tool that builds apps in multiple languages

pip install power-daps==0.0.6


Welcome to power-daps


power-daps is a build tool that can build apps in multiple languages. It also has templates to speed up creation of "hello world" apps in different languages. It has a plugin architecture which allows people to add support for more languages and styles easily.


Across platforms with Python 3

pip3 install power-daps

Mac OS (not yet supported)

brew install power-daps

CentOS or RedHat (not yet supported)

yum install power-daps

Ubuntu or Debian (not yet supported)

apt-get install power-daps

Usage (currently)

Create a new app

Specify the type of app by specifying which meta model you want to use.

Meta models can be specified by the --meta-model or -m flag

Few built-in meta models are provided with power-daps: Java, Python 3, ES 6 and Rust. Here is how you initialize apps with dap in these languages.


dap init --meta-model power_daps/java9


dap init --meta-model power_daps/python3

ECMA Script

dap init --meta-model power_daps/es6


dap init --meta-model power_daps/rust

Build the app

If you have initialized the application with dap init, then just dap will do what is needed by looking at actions.yml at the root of your project. However, you can use the following commands depending on the language:

  • dap deps to install dependencies
  • dap compile if your language requires compiling
  • dap compile_test
  • dap unit_test
  • dap package

Adding dependencies

Edit dependencies.yml at the root level of your project and add dependencies. 'default' here will eventually be 'run' or 'test' etc depending the scope of the dependency. A given app can have dependencies using different package managers. For example, sometimes you may want something that is installed using 'brew_cask' in a python app.



    version: "4.12"
    installer: jar
    group_id: junit


    version: 5.3
    installer: pip3


    version: latest
    installer: npm

Cargo / Rust

    version: latest
    installer: cargo

Usage (eventually)

As a suite of tools

Creating something new

dap create suite

dap create app <app-name>

dap create data-source <app-name>/<data-source-name>[:<data-source-type>] where <data-source-type> is postgres, mysql, oracle, mongodb, cassandra, csv-fetch etc.

Working with existing application suites

The basic structure for using dap is: dap <target>. This will run all preceding targets in the chain, unless you tell it to only run that target by running dap only <target>. Only targets that need to run will run unless you force it by running dap force <target>. If you only want to force one target, run dap force only <target>.

The following targets are provided by default for Java development:

  1. deps: Resolve, download and verify dependencies.
  2. compile: Compile application and test code for compiled languages.
  3. unit-test: Run unit tests.
  4. package: Package the jar or the war or the pip or the gem or the rpm or the docker image.
  5. deploy: Spin up necessary environment, and deploy the necessary components and apps.
  6. functional-test: Run functional tests on the deployed app.

As stand-alone tools

Each Power Daps target comes as a stand-alone command:

  1. dap-create
  2. dap-deps
  3. dap-compile
  4. dap-unit-test
  5. dap-package
  6. dap-deploy
  7. dap-functional-test


Complete target tree:

  • all or default or if you omit a target
    • deps
      • resolve-deps
      • download-deps
      • verify-deps
    • validate
    • compile
      • compile-app
      • compile-test
    • unit-test
    • package or jar or war
    • deploy
      • deploy-machines
        • check-machines
        • stop-machines
        • clean-machines
        • start-machines
      • deploy-dependencies
      • load-data
        • check-data-stores
        • clean-data-stores
        • create-schema
        • populate-data
        • migrate-schema
        • migrate-data
    • component-test
    • contract-test
    • integration-test
    • functional-test

Details of what happens when creating a new application suite

Create a new suite by running dap create suite [dir]. This will create the following directory structure in the current directory or the specified directory:

  • apps
  • bin
  • dashboard
  • env
  • test
    • integration-test
    • functional-test

Details of what happens when creating a new application in the current suite

dap create app <name> will create the following structure under the <name> directory under apps:

  • config
  • identity
  • data
  • sources
    • sample-rdbms
      • schema-migrations
        • 000-initial-schema.sql
      • data-migrations
        • 000-000-initial-data.sql
  • src
  • test
    • unit-test
    • component-test
    • contract-test

Creating a data source for an app

dap create data-source <app-name>/<data-source-name>[:<data-source-type>] where <data-source-type> is postgres, mysql, oracle, mongodb, cassandra, csv-fetch etc.

csv-fetch will allow you to setup a periodic sftp download of CSV files from multiple sources and load them into a particular location accessible to the application.


Power Daps is released under GNU Public License v3.0


Copyright © 2016, Prasanna Pendse