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Daml Hub DIT File Tool

Project description


ddit is a command line tool that streamlines and automates the process of building composite artifacts for Daml Hub. A composite artifact is a collection of multiple single artifacts packaged into a DIT file. Artifacts in a DIT file can include Daml Models and Triggers, Python Bots, Custom UI code, and Integration Types. Daml Hub uses DIT files to package sample applications, libraries, and integrations into a single deployable entity.

Installing ddit

ddit is a Python executable distributed via the PyPI package index. Given a Python installation of version 3.7 or later, ddit can be installed using pip3:

$ pip3 install daml-dit-ddit

Once installed, verify ddit by launching it without arguments:

$ ddit
usage: ddit [-h] [--verbose] {build,clean,ditversion,genargs,inspect,install,publish,release,run,show,targetname} ...

positional arguments:
    build               Build a DIT file.
    clean               Resets the local build target and virtual environment to an empty state.
    ditversion          Print the current version in dabl-meta.yaml
    genargs             Write a template integration argfile to stdout
    inspect             Inspect the contents of a DIT file.
    install             Install the DIT file's dependencies into a local virtual environment.
    publish             Tag and release the current DIT file.
    release             Tag and release the current DIT file.
    run                 Run the current project as an integration.
    show                Verify and print the current metadata file.
    targetname          Print the build target filename to stdout

optional arguments:
  -h, --help            show this help message and exit
  --verbose             Turn on additional logging.
2021-06-30T13:20:33-0500 [ERROR] (ddit) Fatal Error: Subcommand missing.

ddit Project structure

In common with other build tools, ddit exposes its interface via a set of subcommands and operates in project directories with a standard layout. There are three requirements for a ddit project directory:

  • dabl-meta.yaml - A metadata file at the root of the project that contains information on the contents of the project. (Name, version, URL links, etc.)
  • pkg/ - A subdirectory containing resources and files that will be included in the output DIT.
  • An optional Daml model build, also at the project root. (daml.yaml and a source directory.)


Every project has a dabl-meta.yaml file at its root. The format of the file is defined in daml-dit-api, and a typical example looks like this:

    name: openwork-board
    version: 3.2.2
    short_description: OpenWork Board
    description: A privacy-focused Kanban board.
    author: Digital Asset (Switzerland) GmbH
    license: Apache-2.0
    tags: [application]
    icon_file: danban-icon.png

Available catalog fields include the following:

Field Description
name Machine-readable name for the project. All DIT files with the same project name are considered to be different versions of the same project.
version The version number of the project
short_description A short description of the project, displayed in the App tile on the console.
description An optional long-form description of the project.
author The name of the author.
email Contract e-mail address for project support.
url The URL to the project's home page,
license The name of project's license.
demo_url An optional link to a live Demonstration instance of the project.
source_url A optional link to the project's source repository.
tags A list of tags associated with the project. These can be used to query specific sets of artifacts from the arcade for display in the console.
icon_file The filename for the project's icon file. This file can be either a PNG or SVG image and must be present by that name in the output DIT. By default, ddit will look for the icon file in the project root and include from there if found.

Note that there are a few other catalog fields listed in the API source and shown in the output of ddit inspect. These are generally legacy fields used in earlier versions of Daml Hub. To ensure compatability, ddit will normalize the contents of dabl-meta.yaml to include values for these fields (and some of these other fields can still be specified in dabl-meta.yaml for their original purpose.) These other fields (the ones not listed above) should be considered deprecated for future use.


This is an optional directory that contains other resources to be includued in the output DIT.

Daml Project

ddit is integrated into the Daml SDK, and DIT file projects can be colocated in the same directory as daml.yaml. If a Daml project is present, ddit will automatically manage the build of the resultant DAR and include it in the output DIT. For projects that need more control over the DAR build process, the automatic DAR build can be disabled with --skip-dar-build.

Building a project with ddit

A project can be built with ddit build. For examples of what this looks like in practice, please see one of several sample applications available through Daml Hub:

These are all built using Makefiles that manage the build of individual artifacts within each project. ddit does not build user interfaces, so the Makefile handles that aspect of the build and delegates to ddit to manage build, packaging, and release of the DIT file itself. ddit primarily serves to assemble packages out of components built by other build processes. To include these sorts of artifacts into a DIT file, ddit build has a --subdeployments option that takes a list of other artifacts that will be included in the DIT file and deployed as part of the DIT file deployment.

Inspecting a DIT file.

To facilitate management of DIT files, ddit inspect can be used to view a summary of the contents of a DIT file. This includes relevent artifact hashes, information on the associated Daml model, and catalog information for the file.

$ ddit inspect dabl-integration-core-0.9.7.dit
Artifact hash:  7663d38129c2ed47e921a99713f1ca95285b0a1ff9e0bbad3768363cc3158d15

Package Catalog:
   name : dabl-integration-core
   version : 0.9.7
   description : Timer and Loopback Integrations
   release_date : 2021-06-22
   author : Digital Asset (Switzerland) GmbH
   url : None
   email : None
   license : Apache-2.0
   experimental : False
   demo_url : None
   source_url :
   tags : ['integration']
   short_description : The Core Pack
   group_id : com.digitalasset
   icon_file : integration-icon.svg

Daml Model:
   Name/Version: dabl-integration-core:1.1.1
   Package ID: 779c8ad14dd7c7bce05035bbdf7e374e0a349ac501bc4289246b2eaeaef7f990

Integration Types:
   loopback - Loopback
   timer - Timer
   ledger_event_log - Ledger Event Log
   table - Table

   dabl-integration-core-1.1.1.dar (234742 bytes, 6c2b1589f5c3083114c78d195af2f1f139661c3cdfb13f4b9f143f9706576f92)

Building integrations

Integration DIT files differ from applications in that they contain code that runs inside Daml Hub with elevated permissions that enable them to access external network connections. Integrations are the only deployable code that has this permission. Because of these elevated runtime rights, specific user permissions are required to deploy integration DIT files to Daml Hub. Please contact Digital Asset for more information on deploying custom integration types into Daml Hub.

ddit will build an integration DIT file for projects that define integration_types in their dabl-meta.yaml This section specifies the integration types contained in the DIT file. When building as an integration, the DIT file project directory gains some of the traits of a Python project.

  • Python dependencies to be included in the output DIT can be specified in an optional requirements.txt file at the root of the project.
  • Python source for the integrations is stored in src/.

ddit provides several additional utility commands to assist developing an integration:

  • ddit genargs - This generates a template argument file for the integration to be run locally. Once generated, the template should be edited to include the desired configuration values.
  • ddit run - This runs an integration locally against a locally running ledger.

For more details on implementing an integration, see the daml-dit-if documeentation.

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