project:DABL is a cloud platform built to help you take your SaaS application from humble beginnings to mass adoption with as little development as possible.
DABL is a great option for any developer looking to build a simpler, scalable backend for their application with a serverless experience.
Almost any application heavier than a pure web app can benefit from using project:DABL as a backend. Developers are using project:DABL to build applications like crypto exchanges, loan management platforms, medical claims management, digital rights management, and many more.
Witness the powerful combination of DAML and DABL in this video that shows how to build and deploy a simple chat app from scratch in under 10 minutes.
Home is the first tab you see when signing into project:DABL. From here, you can join existing project:DABL applications, or head over to the Workspace to create your own. You can also get an overview of Recent Activity across all the DABL apps you are currently participating in.
If you've been invited to join a project:DABL application, you'll be able to click the Join by Ledger ID button to add it to your Apps list. While you're joining an app by Ledger ID, you will be prompted to enter in a custom name for the application. This is for your convenience, so you can remember the application when you see it again later.
After joining the app, you will have the ability to create contracts on the ledger, see your current active contracts, and exercise choices. See Live Data for more details.
As activity from the ledgers you've joined starts coming in, the Recent Activity section will begin to populate, telling you: what contracts have been created that are visible to you, the name of the contract's template, and the parties associated with the contract. Clicking on the contract in the Recent Activity list will take you directly to it on the Live Data page, where more options are available.
After signing in to project:DABL, you will be given your very own app building workspace. The workspace is where you can manage files and organize your ledgers into projects. Each project can contain multiple ledgers, that differ based on their deployments. Both projects and ledgers can be created and deleted within the workspace. For more information on ledgers, please see the DA Ledger Model.
The collections tab in the workspace is where you can upload DAML, automation, UI assets or integration files. By keeping your files in your workspace collections, it is easier to deploy and re-deploy them across multiple ledgers. Files can be deployed from the workspace collections by clicking the button Deploy to..., or by simply dragging and dropping into a ledger.
The workspace is also home to pre-built sample applications. For more information and a quick start guide, see Deploying your own DABL Chat app.
The Quick Build tab is revealed when you click "Wondering what to do next?". It shows you the building blocks of your DABL app, and the file count of your current ledger. Click on a tile to upload DAML, DAML Triggers, automation, and UI assets directly to your ledger.
By clicking on a ledger in the workspace, you can view its console. The Deployments tab in the ledger's console is where you can manage app artifacts, configure files, and publish a frontend for your application.
Files uploaded will automatically be deployed, unless they require pre-configuration. Unconfigured files that have yet to be deployed will appear under Action Needed.
Once configured, deployments are listed in the Deployments table. Here you can easily manage and access each deployment's data, instances, logs, code, and settings.
DAML templates define the data model and the functional features of your application. For more information on DAML, and DAML Models, see An Introduction to DAML.
Most applications powered by project:DABL will include a combination of DAML templates and automation. You can write automated services in Python or by using DAML Triggers.
DAML Triggers allow you to write your app's automated processes in DAML. To deploy a DAML Trigger to DABL, have all of the DAML templates compiled into one model
.dar. Have the separate trigger project import this model in the
sdk-version: X.X.X name: copy-trigger source: daml parties: - Alice - Bob version: 0.0.1 # trigger-dependencies-begin dependencies: - daml-prim - daml-stdlib - daml-trigger - copy-trigger-model-0.0.1.dar # trigger-dependencies-end
daml build on the trigger project, then upload both the model
.dar and the trigger build separately to your DABL ledger.
For more information on DAML Triggers see Runnning a DAML Trigger.
Python bots must be uploaded and deployed in the form of
.tar.gz files. You can read more about how to write and test bots here.
Integrations are installable modules that allow your app to interact with the outside world by sending and receiving requests from external systems. Once installed in a DABL app, an integration mediates between the DABL ledger and an external system, managing connections to the external system, converting data to and from DAML contracts, and participating fully in the DAML security and permissions model. Integrations are uploaded and deployed in the form of
.dit files and managed through the DABL console. To get started, there is a standard package of some basic integrations available in the Workspace under After you create a project.... You can read more about how to configure and install integrations here.
The App UI allows you to provide a frontend for your app by publishing files to a ledger-specific subdomain. These assets must be uploaded and deployed in the form of
.zip files. The
.zip should contain a single root directory and the contents of that directory should contain an
index.html, along with the rest of the resources for your UI. A good example of this file structure can be found in here in the DABL Chat repo.
Once your UI Asset is deployed to its associated ledger, you can publish it to a unique subdomain. Once the website spins up, you can visit your new site by clicking View Site.
The Live Data tab allows you to explore the DAML contracts on your ledger.
The table displays a list of contracts filtered by party. Therefore, the contracts listed at any given time are those that the selected party can view and take action on. You can manually add parties by clicking the Add Party button.
You can view a specific contract's data by selecting it from the center column. Additionally, you can exercise choices on behalf of your currently selected party. DAML contracts can be created in two ways: either by clicking the Add Contract button and creating a new contract from a template or by exercising a choice on an existing contract. New contracts are temporarily marked with a green dot to indicate that they have been recently created.
When creating a contract from a template, be advised of the following type structure:
Primitives - For Int, Decimal, Text, Timestamp, Scenario, and ContractId simply enter the value in the empty field. Date lets you select the date you want from a calendar. Party and Bool inputs contain dropdowns where you select the desired value.
Note: The Party dropdown will only display the parties that are visible to you. If you've created the ledger, you will see all the parties of each joined user. If you've joined someone else's ledger, you will only be privy to the parties that you've created. If you would like to input a party that you don't have visibility to, you will need to ask that party's user for their party ID, and paste it into the dropdown directly.
- Lists - Enter each value of the list separately and press enter. An empty list is created by default if you don't enter any values. If you wish to delete a single value, press on the x that appears above it.
- Optionals - Optional primitives are inline whereas optional records and variants are on newlines. To input an optional value, click on the view button and fill in the fields. The information is saved even when you collapse the window. If you don't want to enter anything, leave the fields blank.
- Maps - Maps are represented as key-value pairs. Keys and values have their respectively separate input fields.
- User-Defined Types - Variants appear as dropdowns and records as blocks containing their values. Variants with constructors appear as dropdown menus. Each constructor is an item on the dropdown. Once a constructor is chosen, the input fields for it appear below.
The representation of user-defined types may become arbitrarily complicated and this user interface assumes a relatively simple structure of the latter.
After signing in to the project:DABL console, a few sample apps will appear at the bottom of the workspace. These are simple DABL applications, built by DABL engineers. Deploy them onto a ledger to get started with a fully implemented example.
Click on New Project and provide a unique name for your project and first ledger. A new project and dedicated ledger will be deployed in a couple of minutes.
Go to the Deployments tab. The uncongifured Automation Files will appear under Action Needed. Click on each and configure the automation to run as UserAdmin. Click Launch. It will take a couple of minutes to deploy.
Once the automation is running, it will appear under Deployments.
In the Deployments tab is a file listed as a UI Asset. If not already published, click Publish. It will take a few seconds, once it's deployed, click on Visit Site at the top of the deployments table to interact with your very own sample app instance!
Interact with the application through the app’s UI:
After deploying your sample app, you can inspect active contracts on the ledger and create new ones from the Live Data tab, upgrade and view your artifacts in the Deployments tab, and learn more about your ledger in Ledger Settings.
If you want to modify a sample app according to your needs you can find the source code on:
DABL Chess Github (coming soon!)
DABL integration types are defined using
.dit files containing the
resources needed for the integration to operate. This always includes
the executable code required for the integration and often includes
one or more DAML models used to represent the data managed by the
integration. Deploying a
.dit file into a ledger makes both the
DAML models and the integration code itself available for use within
.dit file is done in the same style as other
deployable artifacts, either by dragging the filename from the
collection to the ledger in the workspace, or with the Deploy to...
.dit file has been deployed into a ledger, the resources
defined within that file are shown as Deployments. In
this case, starting with an empty ledger, deploying the
added a DAML model and two integration types that can be configured.
Clicking on a type of integration in the action needed section, links to a page that describes the operation of the integration and allows configuration properties of that integration to be specified.
Every integration has two standard configuration fields - a field for a human-readable comment describing the purpose of the specific integration, and a field identifying the ledger party the integration will run as. When running, the integration has only the rights of the "Run As" party - It can only see events relating to the contracts visible to that party and can only exercise choices on behalf of that party. If there is a need for an integration to run as more than a single party, a separate deployment of the integration must be created for each party. Some integrations also allow for additonal configuration fields beyond just these two.
Once the integration has been launched, it appears on a list of deployments of that type of integration. Additional deployments (running as different parties or with different configuration settings) can be added by clicking on Configure New deployment. The Pause button temporarily disables the integration, and the Delete button completely deletes it.
There are also options availble under Details for inspecting and adjusting the configuration of the integration, viewing the detailed status of the integration, and seeing a technical log of how the integration is operating.
You can view running integrations as listed on the Deployments screen. Clicking on the name of the integration links to the deployment list for that specific integration and the screen for creating new deployments of that type:
DABL ships with two special purpose core integrations. These are not typical integrations in that they do not strictly integrate with external systems, but they are intended for solving specific problems without additonal code. The first is a periodic timer integration that allows ledger choices to be exercised in response to a periodic timer. The second is a Loopback integration that allows ledger commands to be issued in response to events occurring on the ledger.
If you have an interest in adding custom integration types to DABL, either for your own use or for the community, please contact Digital Asset for more details.