celestia-client 0.2.0

use std::error::Error as StdError;
use std::fmt::{self, Debug};
use std::sync::Arc;

use blockstore::cond_send::CondSend;
use celestia_grpc::{GrpcClient, GrpcClientBuilder};
use celestia_rpc::{Client as RpcClient, HeaderClient};
use http::Request;
use tonic::body::Body as TonicBody;
use tonic::codegen::{Bytes, Service};
use tonic::metadata::MetadataMap;

use crate::blob::BlobApi;
use crate::blobstream::BlobstreamApi;
use crate::fraud::FraudApi;
use crate::header::HeaderApi;
use crate::share::ShareApi;
use crate::state::StateApi;
use crate::tx::{DocSigner, Keypair, VerifyingKey};
use crate::types::state::AccAddress;
use crate::types::ExtendedHeader;
use crate::{Error, Result};

/// A high-level client for interacting with a Celestia node.
///
/// There are two modes: read-only mode and submit mode. Read-only mode requires
/// RPC and optionally gRPC endpoint, while submit mode requires both, plus a signer.
///
/// # Examples
///
/// Read-only mode:
///
/// ```no_run
/// # use celestia_client::{Client, Result};
/// # async fn docs() -> Result<()> {
/// let client = Client::builder()
///     .rpc_url("ws://localhost:26658")
///     .grpc_url("http://localhost:9090") // optional in read-only mode
///     .build()
///     .await?;
///
/// client.header().head().await?;
/// # Ok(())
/// # }
/// ```
///
/// Submit mode:
///
/// ```no_run
/// # use celestia_client::{Client, Result};
/// # use celestia_client::tx::TxConfig;
/// # async fn docs() -> Result<()> {
/// let client = Client::builder()
///     .rpc_url("ws://localhost:26658")
///     .grpc_url("http://localhost:9090")
///     .private_key_hex("393fdb5def075819de55756b45c9e2c8531a8c78dd6eede483d3440e9457d839")
///     .build()
///     .await?;
///
/// let to_address = "celestia169s50psyj2f4la9a2235329xz7rk6c53zhw9mm".parse().unwrap();
/// client.state().transfer(&to_address, 12345, TxConfig::default()).await?;
/// # Ok(())
/// # }
/// ```
///
/// [`celestia-rpc`]: celestia_rpc
/// [`celestia-grpc`]: celestia_grpc
pub struct Client {
    inner: Arc<ClientInner>,
    state: StateApi,
    blob: BlobApi,
    header: HeaderApi,
    share: ShareApi,
    fraud: FraudApi,
    blobstream: BlobstreamApi,
}

pub(crate) struct ClientInner {
    pub(crate) rpc: RpcClient,
    grpc: Option<GrpcClient>,
    pubkey: Option<VerifyingKey>,
    chain_id: tendermint::chain::Id,
}

/// A builder for [`Client`].
#[derive(Debug, Default)]
pub struct ClientBuilder {
    rpc_url: Option<String>,
    rpc_auth_token: Option<String>,
    grpc_builder: Option<GrpcClientBuilder>,
}

impl ClientInner {
    pub(crate) fn grpc(&self) -> Result<&GrpcClient> {
        self.grpc.as_ref().ok_or(Error::GrpcEndpointNotSet)
    }

    pub(crate) fn pubkey(&self) -> Result<&VerifyingKey> {
        self.pubkey.as_ref().ok_or(Error::NoAssociatedAddress)
    }

    pub(crate) fn address(&self) -> Result<AccAddress> {
        let pubkey = self.pubkey()?.to_owned();
        Ok(AccAddress::new(pubkey.into()))
    }

    pub(crate) async fn get_header_validated(&self, height: u64) -> Result<ExtendedHeader> {
        let header = self.rpc.header_get_by_height(height).await?;
        header.validate()?;
        Ok(header)
    }
}

impl Client {
    /// Returns `ClientBuilder`.
    pub fn builder() -> ClientBuilder {
        ClientBuilder::new()
    }

    /// Returns chain id of the network.
    pub fn chain_id(&self) -> &tendermint::chain::Id {
        &self.inner.chain_id
    }

    /// Returns the public key of the signer.
    pub fn pubkey(&self) -> Result<VerifyingKey> {
        self.inner.pubkey().cloned()
    }

    /// Returns the address of signer.
    pub fn address(&self) -> Result<AccAddress> {
        self.inner.address()
    }

    /// Returns state API accessor.
    pub fn state(&self) -> &StateApi {
        &self.state
    }

    /// Returns blob API accessor.
    pub fn blob(&self) -> &BlobApi {
        &self.blob
    }

    /// Returns blobstream API accessor.
    pub fn blobstream(&self) -> &BlobstreamApi {
        &self.blobstream
    }

    /// Returns header API accessor.
    pub fn header(&self) -> &HeaderApi {
        &self.header
    }

    /// Returns share API accessor.
    pub fn share(&self) -> &ShareApi {
        &self.share
    }

    /// Returns fraud API accessor.
    pub fn fraud(&self) -> &FraudApi {
        &self.fraud
    }
}

impl ClientBuilder {
    /// Returns a new builder.
    pub fn new() -> ClientBuilder {
        ClientBuilder::default()
    }

    /// Set signer and its public key.
    pub fn signer<S>(mut self, pubkey: VerifyingKey, signer: S) -> ClientBuilder
    where
        S: DocSigner + Sync + Send + 'static,
    {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.pubkey_and_signer(pubkey, signer));
        self
    }

    /// Set signer from a keypair.
    pub fn keypair<S>(mut self, keypair: S) -> ClientBuilder
    where
        S: DocSigner + Keypair<VerifyingKey = VerifyingKey> + Sync + Send + 'static,
    {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.signer_keypair(keypair));
        self
    }

    /// Set signer from a raw private key.
    pub fn private_key(mut self, bytes: &[u8]) -> ClientBuilder {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.private_key(bytes));
        self
    }

    /// Set signer from a hex formatted private key.
    pub fn private_key_hex(mut self, s: &str) -> ClientBuilder {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.private_key_hex(s));
        self
    }

    /// Set the RPC endpoint.
    pub fn rpc_url(mut self, url: &str) -> ClientBuilder {
        self.rpc_url = Some(url.to_owned());
        self
    }

    /// Set the authentication token of RPC endpoint.
    pub fn rpc_auth_token(mut self, auth_token: &str) -> ClientBuilder {
        self.rpc_auth_token = Some(auth_token.to_owned());
        self
    }

    /// Set the gRPC endpoint.
    ///
    /// # Note
    ///
    /// In WASM the endpoint needs to support gRPC-Web.
    pub fn grpc_url(mut self, url: &str) -> ClientBuilder {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.url(url));
        self
    }

    /// Set manually configured gRPC transport
    pub fn grpc_transport<B, T>(mut self, transport: T) -> Self
    where
        B: http_body::Body<Data = Bytes> + Send + Unpin + 'static,
        <B as http_body::Body>::Error: StdError + Send + Sync,
        T: Service<Request<TonicBody>, Response = http::Response<B>>
            + Send
            + Sync
            + Clone
            + 'static,
        <T as Service<Request<TonicBody>>>::Error: StdError + Send + Sync + 'static,
        <T as Service<Request<TonicBody>>>::Future: CondSend + 'static,
    {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.transport(transport));
        self
    }

    /// Appends ascii metadata to all requests made by the client.
    pub fn grpc_metadata(mut self, key: &str, value: &str) -> Self {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.metadata(key, value));
        self
    }

    /// Appends binary metadata to all requests made by the client.
    ///
    /// Keys for binary metadata must have `-bin` suffix.
    pub fn grpc_metadata_bin(mut self, key: &str, value: &[u8]) -> Self {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.metadata_bin(key, value));
        self
    }

    /// Sets the initial metadata map that will be attached to all requestes made by the client.
    pub fn grpc_metadata_map(mut self, metadata: MetadataMap) -> Self {
        let grpc_builder = self.grpc_builder.unwrap_or_default();
        self.grpc_builder = Some(grpc_builder.metadata_map(metadata));
        self
    }

    /// Build [`Client`].
    pub async fn build(self) -> Result<Client> {
        let rpc_url = self.rpc_url.as_ref().ok_or(Error::RpcEndpointNotSet)?;
        let rpc_auth_token = self.rpc_auth_token.as_deref();

        #[cfg(target_arch = "wasm32")]
        if rpc_auth_token.is_some() {
            return Err(Error::AuthTokenNotSupported);
        }

        let (grpc, pubkey) = if let Some(grpc_builder) = self.grpc_builder {
            let client = grpc_builder.build()?;
            let pubkey = client.get_account_pubkey();
            (Some(client), pubkey)
        } else {
            (None, None)
        };

        #[cfg(not(target_arch = "wasm32"))]
        let rpc = RpcClient::new(rpc_url, rpc_auth_token).await?;

        #[cfg(target_arch = "wasm32")]
        let rpc = RpcClient::new(rpc_url).await?;

        let head = rpc.header_network_head().await?;
        head.validate()?;

        if let Some(grpc) = &grpc {
            if &grpc.chain_id().await? != head.chain_id() {
                return Err(Error::ChainIdMissmatch);
            }
        }

        let inner = Arc::new(ClientInner {
            rpc,
            grpc,
            pubkey,
            chain_id: head.chain_id().to_owned(),
        });

        Ok(Client {
            inner: inner.clone(),
            blob: BlobApi::new(inner.clone()),
            header: HeaderApi::new(inner.clone()),
            share: ShareApi::new(inner.clone()),
            fraud: FraudApi::new(inner.clone()),
            blobstream: BlobstreamApi::new(inner.clone()),
            state: StateApi::new(inner.clone()),
        })
    }
}

impl Debug for Client {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("Client { .. }")
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    use lumina_utils::test_utils::async_test;

    use crate::test_utils::{TEST_PRIV_KEY, TEST_RPC_URL};

    #[async_test]
    async fn builder() {
        let e = Client::builder()
            .rpc_url(TEST_RPC_URL)
            .private_key_hex(TEST_PRIV_KEY)
            .build()
            .await
            .unwrap_err();
        assert!(matches!(e, Error::GrpcEndpointNotSet))
    }
}