@lifi/abi-parser v0.0.1-alpha.5

abi-parser

Requirements

Part of our daily business as developers is analysing the call data of transactions (e.g. to find out why they failed).

We would like to have a tool that accepts a call data string and tries to parse it against a set of known ABIs. Ultimately we would like to host the tool on a simple website, but initially a script or CLI is fine as long as it can be easily migrated later on.

Calls to our own Smart Contract often contain wrapped call data inside the actual call data. It would be great to be able to parse this information as well against the same set of ABIs. These calls can be:

• Calls to Dexes on the source chain to perform a swap before calling the bridge (Dex ABIs will have to be added along the way, we don’t need them in this initial implementation)
• Calls to our Fee Collector contract on the source chain to collect fees before calling the bridge
• Calls to our own contract on the destination chain to perform a swap after the bridging process

Usage

Install dependencies

pnpm install

Parse call data

The tool is available as script in the package.json. The call data string to parse is passed as argument:

pnpm run parse-call-data xa4baa10c...

The tool allows passing multiple call data strings as arguments:

pnpm run parse-call-data xa4baa10c... 0x2a7a7042...

An example invocation looks like this:

pnpm run parse-call-data 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Add new ABI

ABIs are read from the abis/ directory when the tool is initialized. New ABIs are added by creating a JSON file that contains the ABI data in this directory.

Development

Lint code

The following command lints the code using eslint, formats the code according to prettier and checks the types in the code using tsc:

pnpm run lint

Execute test cases

Services are tested using jest. The tests can be executed using the following command:

pnpm run test