Explorer Backend

Explorer backend is an app:

• Deals with blockchain nodes.
• Supports our database implementation.
• Provides a nice REST & websocket API.

To-do

• APR calculation.
• Indexing special chain specific data.
• A great database implementation to store important stuff.
• A nice WebSocket interface to provide multiple events to subscribe dynamic data.

Usage

If you don't have Rust installed, follow the instructions at rust-lang.org.

• Clone the repository by typing this in terminal: git clone https://github.com/testnetrunn/explorer-backend.git
• Set working directory to the project by typing this in terminal: cd explorer-backend
• Run the project by typing this in terminal: cargo run --release
• Go to src/routes/ folder, and pick any of the files inside.
• Each function represents a different path.
• Test by visiting paths with a browser.

Development

Support a new chain.

Open Chains.yaml file, and provide the required info below in the end of the file:

• Name
• Logo
• RPC URL
• REST API URL
• Web Socket URL

All other info is optional, and some of them are generated automatically.

For example:

•••

name: axelar
logo: https://assets.coingecko.com/coins/images/24489/large/tsYr25vB_400x400.jpg
rpc: https://rpc.cosmos.directory/axelar
rest: https://axelar-api.polkachu.com
wss: wss://axelar-rpc.chainode.tech/websocket

Support a new endpoint.

Go to src/routes, and find or create a new file for the category associated with the new endpoint to be supported.

Don't forget to import important stuff.

Create a new function representing the endpoint like below:

#[get("{chain}/example")]
pub async fn example(path: Path<String>, chains: Data<State>) -> impl Responder {
    let chain = path.into_inner();

    Json(match chains.get(&chain) {
        Ok(chain) => chain.get_example().await.into(),
        Err(err) => Response::Error(err),
    })
}

{chain} means a path variable, and its type is defined at Path<String>.

If there is also another variable, we define its type as Path<(String, OtherVarType)>.

You have to create a fetch method for Chain struct before creating the endpoint.

Create a new method.

Go to src/fetch, and find or create a new file for the category associated with the new method to be created. Define a new method inside impl block like below:

impl Chain {
    •••
    
    pub async fn get_signing_info(&self, cons_addr: &str) -> Result<OutRestResponse<InternalSlashingSigningInfoItem>, String> {
       let path = format!("/cosmos/slashing/v1beta1/signing_infos/{cons_addr}");

       let resp = self.rest_api_request::<SigningInfoResp>(&path, &[]).await?;

       let signing_info = resp.val_signing_info.try_into()?;

       OutRestResponse::new(signing_info, 0)
   }

}

If the method is not chain agnostic, you use a logic like if self.inner.name == "evmos" there.