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Mithril client library

info

Mithril client library can be used by Rust developers to use the Mithril network in their applications.

It is responsible for handling the different types of data certified by Mithril, and available through a Mithril aggregator:

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Mithril networks

Here is an updated list of all Mithril networks, including their configurations and current statuses:

Last update: 07/21/2023

release-mainnet​

Information-
Mithril networkrelease-mainnet
Cardano networkmainnet
Cardano magic Id-
SupportedYes ✔️
StatusBeta 🟢
Aggregator endpointhttps://aggregator.release-mainnet.api.mithril.network/aggregator ↗️
Genesis verification keyhttps://raw.githubusercontent.com/input-output-hk/mithril/main/mithril-infra/configuration/release-mainnet/genesis.vkey ↗️
Era reader adapter typecardano-chain
Era reader addresshttps://raw.githubusercontent.com/input-output-hk/mithril/main/mithril-infra/configuration/release-mainnet/era.addr ↗️
Era reader verification keyhttps://raw.githubusercontent.com/input-output-hk/mithril/main/mithril-infra/configuration/release-mainnet/era.vkey ↗️
Build fromLatest release ↗️
caution

In this documentation, we use the following generic identifiers:

  • YOUR_CARDANO_NETWORK You need to replace this with the name of the network that runs on your Cardano node (eg, preprod)
  • YOUR_AGGREGATOR_ENDPOINT You need to replace this with the endpoint of an aggregator that runs on the Cardano network you are targeting (eg, https://aggregator.release-preprod.api.mithril.network/aggregator)
  • YOUR_GENESIS_VERIFICATION_KEY You need to replace this with the genesis verification key URL that runs on the Cardano network you are targeting (eg, https://raw.githubusercontent.com/input-output-hk/mithril/main/mithril-infra/configuration/release-preprod/genesis.vkey)
  • YOUR_ERA_READER_ADAPTER_TYPE You need to replace this with the era reader adapter type used by the Mithril network you are targeting (eg, cardano-chain)
  • YOUR_ERA_READER_ADDRESS You need to replace this with the era reader address URL used by the Mithril network you are targeting (eg, https://raw.githubusercontent.com/input-output-hk/mithril/main/address.addr)
  • YOUR_ERA_READER_VERIFICATION_KEY You need to replace this with the era reader verification key URL used by the Mithril network you are targeting (eg, https://raw.githubusercontent.com/input-output-hk/mithril/main/TEST_ONLY_era.vkey)

Resources​

NodeSource repositoryRust documentation
Mithril client↗️↗️

Pre-requisites​

  • Install the latest stable version of the correctly configured Rust toolchain.

  • Install OpenSSL development libraries. For example, on Ubuntu/Debian/Mint, run apt install libssl-dev

Installation​

In your project, use cargo to add mithril-client crate as a dependency:

cargo add mithril-client
info

Mithril client is an asynchronous library, you will need a runtime to execute your futures. We recommend to use the crate tokio, as the library has been tested with it.

Using Mithril client library​

Below is a basic example of how to use most of the functions exposed by the Mithril client library:

/src/main.rs
use mithril_client::{ClientBuilder, MessageBuilder};
use std::path::Path;

#[tokio::main]
async fn main() -> mithril_client::MithrilResult<()> {
    let client = ClientBuilder::aggregator("YOUR_AGGREGATOR_ENDPOINT", "YOUR_GENESIS_VERIFICATION_KEY").build()?;
    
    let snapshots = client.snapshot().list().await?;
    
    let last_digest = snapshots.first().unwrap().digest.as_ref();
    let snapshot = client.snapshot().get(last_digest).await?.unwrap();
    
    let certificate = client
        .certificate()
        .verify_chain(&snapshot.certificate_hash)
        .await?;
    
    // Note: the directory must already exist, and the user running this code must have read/write access to it.
    let target_directory = Path::new("YOUR_TARGET_DIRECTORY");
    client
        .snapshot()
        .download_unpack(&snapshot, target_directory)
        .await?;

    if let Err(e) = client.snapshot().add_statistics(&snapshot).await {
        println!("Could not increment snapshot download statistics: {:?}", e);
    }
    
    let message = MessageBuilder::new()
        .compute_snapshot_message(&certificate, target_directory)
        .await?;
    assert!(certificate.match_message(&message));
    
    Ok(())
}
info

Snapshot download and certificate chain validation can take quite some time even with a fast computer and network. We have implemented a feedback mechanism for them, more details on it are available in the feedback sub-module.

An example of implementation with the crate indicatif is available in the Mithril repository. To run it, execute the following command:

cargo run -p client-snapshot

or directly from the example crate directory:

cargo run

Here is a working example of the code using the configuration parameters of the release-preprod network:

/src/main.rs
use mithril_client::{ClientBuilder, MessageBuilder};
use std::path::Path;

#[tokio::main]
async fn main() -> mithril_client::MithrilResult<()> {
    let client = ClientBuilder::aggregator("https://aggregator.release-preprod.api.mithril.network/aggregator", "5b3132372c37332c3132342c3136312c362c3133372c3133312c3231332c3230372c3131372c3139382c38352c3137362c3139392c3136322c3234312c36382c3132332c3131392c3134352c31332c3233322c3234332c34392c3232392c322c3234392c3230352c3230352c33392c3233352c34345d").build()?;
    
    let snapshots = client.snapshot().list().await?;
    
    let last_digest = snapshots.first().unwrap().digest.as_ref();
    let snapshot = client.snapshot().get(last_digest).await?.unwrap();
    
    let certificate = client
        .certificate()
        .verify_chain(&snapshot.certificate_hash)
        .await?;
    
    // Note: the directory must already exist, and the user running this code must have read/write access to it.
    let target_directory = Path::new(".");
    client
        .snapshot()
        .download_unpack(&snapshot, target_directory)
        .await?;

    if let Err(e) = client.snapshot().add_statistics(&snapshot).await {
        println!("Could not increment snapshot download statistics: {:?}", e);
    }
    
    let message = MessageBuilder::new()
        .compute_snapshot_message(&certificate, target_directory)
        .await?;
    assert!(certificate.match_message(&message));
    
    Ok(())
}
tip

You can read the complete developer documentation.