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Visualizer

A service for generating Unified Modeling Language (UML) class diagrams and storage diagrams for Solidity contracts based on Node.js package sol2uml.

Requirements

How to enable

Set the following ENVs on blockscout instance:

  • MICROSERVICE_VISUALIZE_SOL2UML_ENABLED=true
  • MICROSERVICE_VISUALIZE_SOL2UML_URL={service_url}

Envs

Here, we describe variables specific to this service. Variables common to all services can be found here.

Variable Required Description Default value

* There are no service specific variables for the service

Result Examples

UML diagram

img1

Storage

img2

Usage

The service runs in a Docker container, which creates two images when it is built. One of them is intermediate and can be removed. Use docker-compose to build the service. The service only accepts POST requests.

Generate UML diagram

Request path is /solidity/uml, request should contain JSON with single key sources, value for this key is map with relative file path - file content pairs.

Example:

{
  "sources": {
    "src/test1.sol": "...first contract code..."
    "src/test2.sol": "...second contract code..."
  }
}

Service response contains JSON with single key uml_diagram, which value is the bytecode of UML diagram in svg format.

Generate storage diagram

Request path is /solidity/storage, request should contain JSON with such keys:

  • sources, value for this key is map with relative file path - file content pairs, same as for /uml.
  • main_contract, contains the name of the contract for which the store will be generated.
  • main_contract_filename, contains the name of file with main_contract. Needed for situations when there is more than one contract with main_contract name. Be careful, at the moment the service may not work correctly when there are two contracts with the same name in files with the same filename.

Example:

{
  "sources": {
    "src/test1.sol": "...first contract code with 'Main' contract..."
    "src/test2.sol": "...second contract code..."
  },
  "main_contract": "Main",
  "main_contract_filename": "test1.sol"
}

Service response contains JSON with single key storage, which value is the bytecode of storage diagram in svg format.

Testing

For now it is only possible to test service using cargo test. For this you need to install sol2uml globally on your device as mentioned in the repo instructions. Notice that the current version of sol2uml supported by the service is 2.1, so tests may fail with other versions and service may not work correctly.

For testing on Windows you need to rewrite some code due to the way the service is implemented. Change 99 line in src/handlers.rs with:

let output = Command::new("cmd").arg("/C").arg("sol2uml").args(args).output().await?;

/C should be replaced with the drive where sol2uml is installed.

Links