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MidnightDataProvider

midnight_base_crypto::data_provider

Struct MidnightDataProvider 

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pub struct MidnightDataProvider {
    pub fetch_mode: FetchMode,
    pub base_url: Url,
    pub output_mode: OutputMode,
    pub expected_data: Vec<(&'static str, [u8; 32], &'static str)>,
    pub dir: PathBuf,
}
Expand description

Retrieves various static cryptographic artifacts from a data server. This keeps a local file system cache of the parameters, prover keys, verifier keys, and IR, that can also be fetched remotely.

The local cache is located at: $MIDNIGHT_PP / $XDG_CACHE_HOME/midnight/zk-params / $HOME/.cache/midnight/zk-params in that order of fall-backs.

The provider knows which data is in scope, and the SHA-256 hashes of each of these. When reading one of the values from cache, or fetching them, the SHA-256 hash is verified for integrity.

The data provider can operate in an on-demand, or synchronous mode. In the former, if a datum is not locally available, it is fetched when requested. In the latter, the datum is only fetched when explicitly requested via a MidnightDataProvider::fetch call. Key material is always synchronous.

Fields§

§fetch_mode: FetchMode

How to handle requests to fetch data

§base_url: Url

The base URL of the data store to use.

Fetching an item with name will request it from {base_url}/{name}.

§output_mode: OutputMode

How to report status of fetching to the user

§expected_data: Vec<(&'static str, [u8; 32], &'static str)>

Additional (non-parameter) files allows to be fetched Triple of file_path, SHA-256 hash, and description

§dir: PathBuf

The path to the directory where Midnight key material is stored

Implementations§

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impl MidnightDataProvider

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pub fn new( fetch_mode: FetchMode, output_mode: OutputMode, expected_data: Vec<(&'static str, [u8; 32], &'static str)>, ) -> Result<Self>

Creates a new data provider with the default base URL.

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pub async fn fetch(&self, name: &str) -> Result<()>

Fetches a given item.

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pub fn name_k(k: u8) -> String

The name of the public parameters for the given k value.

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pub async fn fetch_k(&self, k: u8) -> Result<()>

Fetches the public parameters for a give k.

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pub async fn get_file(&self, name: &str, desc: &str) -> Result<BufReader<File>>

Retrieves a file from the data provider according to the fetch mode, giving a specific error message on failure.

Trait Implementations§

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impl Clone for MidnightDataProvider

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fn clone(&self) -> MidnightDataProvider

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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