Listing dapps¶

The contractvm infrastructure provide a repository (https://github.com/contractvm/dapp-list) that allows dapp developer to include their dapp in a public catalog, by performing a pull request.

Catalog and installed dapps are available with the “list” command:

dappman -l

The output of that command shows the list of installed, enabled and catalog dapps.

Installed dapps:
         helloworld
Enabled dapps:
         helloworld
Available:
         empty - decentralized empty template
         blockstore - decentralized key-value storage
         helloworld - decentralized helloworld
         fifomom - decentralized fifo message-oriented middleware
         cotst - decentralized contract-oriented middleware based on timed session types

Installing a dapp¶

Installation of dapps is easy; first you need the catalog dapp name, or the dapp git-url, then you can use the “install” command. For example:

dappman -i blockstore

Or the equivalent:

dappman -i https://github.com/contractvm/cvm-dapp-blockstore.git

For developing purposes, it is also possible to install a dapp directly from the file system:

dappman -i /home/dakk/Repositories/dapp-blockstore/

All these variants are equivalent; dappman retrieves the dapp source, installing the client library and the dapp in the dapp directory. If the dapp is installed via git (catalog or git-url), then you can update an installed dapp by typing:

dappman -u blockstore

Removing a dapp¶

The removal of a dapp is similar to installation:

dappman -r blockstore

Note that this command remove only the source code of the dapp, preserving the current dapp state. You can also remove the dapp state by using:

dappman -c blockstore

Creating a new dapp¶

Using dappman, you can also create a new dapp through the dappman creation wizard. A new dapp is created starting from a template: you can use every available dapp as a template. For those who want only the dapp skeleton, an empty template called “empty” is available.

dappman -w

Dappman will ask some informations about your new dapp:

Dapp name: testdapp
Description: My first test dapp
Authors (comma separated): Davide Gessa
Select a template:
         0 . empty (https://github.com/contractvm/cvm-dapp-empty)
         1 . blockstore (https://github.com/contractvm/cvm-dapp-blockstore)
         2 . helloworld (https://github.com/contractvm/cvm-dapp-helloworld)
         3 . fifomom (https://github.com/contractvm/cvm-dapp-fifomom)
         4 . cotst (https://github.com/contractvm/cvm-dapp-cotst)
Template: 0
Creating directory for dapp: testdapp
Downloading template: empty
Extracting template
Setting up directories
String replace for dapp name
Creating manifest.json
Dapp testdapp sucessfully created
You can now install your local dapp by typing: dappman -i /home/dakk/testdapp

After the creation wizard, in your current directory appears a new directory called as your new dapp, and you can directly install it. Further informations about dapp creation are provided in the next tutorial.