2022-02-22 03:26:29 -08:00
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//! Zebra supported RPC methods.
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//!
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//! Based on the [`zcashd` RPC methods](https://zcash.github.io/rpc/)
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//! as used by `lightwalletd.`
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//!
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//! Some parts of the `zcashd` RPC documentation are outdated.
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//! So this implementation follows the `lightwalletd` client implementation.
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2022-03-03 23:00:24 -08:00
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use futures::FutureExt;
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use hex::FromHex;
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use jsonrpc_core::{self, BoxFuture, Error, ErrorCode, Result};
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use jsonrpc_derive::rpc;
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use tower::{buffer::Buffer, ServiceExt};
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2022-03-08 01:14:21 -08:00
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use zebra_chain::{
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serialization::ZcashDeserialize,
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transaction::{self, Transaction},
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};
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2022-02-28 19:32:32 -08:00
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use zebra_network::constants::USER_AGENT;
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use zebra_node_services::{mempool, BoxError};
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2022-02-28 19:32:32 -08:00
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#[cfg(test)]
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mod tests;
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2022-02-22 03:26:29 -08:00
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#[rpc(server)]
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/// RPC method signatures.
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pub trait Rpc {
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/// getinfo
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///
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2022-02-28 19:32:32 -08:00
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/// Returns software information from the RPC server running Zebra.
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///
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/// zcashd reference: <https://zcash.github.io/rpc/getinfo.html>
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///
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/// Result:
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/// {
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/// "build": String, // Full application version
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/// "subversion", String, // Zebra user agent
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/// }
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///
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/// Note 1: We only expose 2 fields as they are the only ones needed for
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/// lightwalletd: <https://github.com/zcash/lightwalletd/blob/v0.4.9/common/common.go#L91-L95>
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///
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/// Note 2: <https://zcash.github.io/rpc/getinfo.html> is outdated so it does not
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/// show the fields we are exposing. However, this fields are part of the output
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/// as shown in the following zcashd code:
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/// <https://github.com/zcash/zcash/blob/v4.6.0-1/src/rpc/misc.cpp#L86-L87>
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/// Zcash open ticket to add this fields to the docs: <https://github.com/zcash/zcash/issues/5606>
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#[rpc(name = "getinfo")]
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fn get_info(&self) -> Result<GetInfo>;
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/// getblockchaininfo
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///
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/// TODO: explain what the method does
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/// link to the zcashd RPC reference
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/// list the arguments and fields that lightwalletd uses
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/// note any other lightwalletd changes
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#[rpc(name = "getblockchaininfo")]
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fn get_blockchain_info(&self) -> Result<GetBlockChainInfo>;
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/// sendrawtransaction
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///
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/// Sends the raw bytes of a signed transaction to the network, if the transaction is valid.
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///
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/// zcashd reference: <https://zcash.github.io/rpc/sendrawtransaction.html>
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///
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/// Result: a hexadecimal string of the hash of the sent transaction.
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///
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/// Note: zcashd provides an extra `allowhighfees` parameter, but we don't yet because
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/// lightwalletd doesn't use it.
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#[rpc(name = "sendrawtransaction")]
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fn send_raw_transaction(
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&self,
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raw_transaction_hex: String,
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) -> BoxFuture<Result<SentTransactionHash>>;
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}
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/// RPC method implementations.
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pub struct RpcImpl<Mempool>
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where
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Mempool: tower::Service<mempool::Request, Response = mempool::Response, Error = BoxError>,
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{
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/// Zebra's application version.
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app_version: String,
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/// A handle to the mempool service.
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mempool: Buffer<Mempool, mempool::Request>,
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}
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impl<Mempool> RpcImpl<Mempool>
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where
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Mempool: tower::Service<mempool::Request, Response = mempool::Response, Error = BoxError>,
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{
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/// Create a new instance of the RPC handler.
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pub fn new(app_version: String, mempool: Buffer<Mempool, mempool::Request>) -> Self {
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RpcImpl {
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app_version,
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mempool,
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}
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}
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}
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impl<Mempool> Rpc for RpcImpl<Mempool>
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where
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Mempool:
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tower::Service<mempool::Request, Response = mempool::Response, Error = BoxError> + 'static,
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Mempool::Future: Send,
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{
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fn get_info(&self) -> Result<GetInfo> {
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let response = GetInfo {
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build: self.app_version.clone(),
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subversion: USER_AGENT.into(),
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};
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Ok(response)
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}
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fn get_blockchain_info(&self) -> Result<GetBlockChainInfo> {
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// TODO: dummy output data, fix in the context of #3143
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let response = GetBlockChainInfo {
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chain: "TODO: main".to_string(),
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};
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Ok(response)
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}
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fn send_raw_transaction(
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&self,
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raw_transaction_hex: String,
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) -> BoxFuture<Result<SentTransactionHash>> {
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let mempool = self.mempool.clone();
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async move {
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let raw_transaction_bytes = Vec::from_hex(raw_transaction_hex).map_err(|_| {
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Error::invalid_params("raw transaction is not specified as a hex string")
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})?;
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let raw_transaction = Transaction::zcash_deserialize(&*raw_transaction_bytes)
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.map_err(|_| Error::invalid_params("raw transaction is structurally invalid"))?;
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let transaction_hash = raw_transaction.hash();
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let transaction_parameter = mempool::Gossip::Tx(raw_transaction.into());
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let request = mempool::Request::Queue(vec![transaction_parameter]);
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let response = mempool.oneshot(request).await.map_err(|error| Error {
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code: ErrorCode::ServerError(0),
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message: error.to_string(),
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data: None,
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})?;
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let queue_results = match response {
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mempool::Response::Queued(results) => results,
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_ => unreachable!("incorrect response variant from mempool service"),
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};
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assert_eq!(
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queue_results.len(),
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1,
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"mempool service returned more results than expected"
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);
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match &queue_results[0] {
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Ok(()) => Ok(SentTransactionHash(transaction_hash)),
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Err(error) => Err(Error {
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code: ErrorCode::ServerError(0),
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message: error.to_string(),
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data: None,
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}),
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}
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}
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.boxed()
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}
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}
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#[derive(serde::Serialize, serde::Deserialize)]
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/// Response to a `getinfo` RPC request.
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pub struct GetInfo {
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build: String,
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subversion: String,
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}
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#[derive(serde::Serialize, serde::Deserialize)]
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/// Response to a `getblockchaininfo` RPC request.
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pub struct GetBlockChainInfo {
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chain: String,
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// TODO: add other fields used by lightwalletd (#3143)
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}
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#[derive(Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
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/// Response to a `sendrawtransaction` RPC request.
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///
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/// A JSON string with the transaction hash in hexadecimal.
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2022-03-08 01:14:21 -08:00
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pub struct SentTransactionHash(#[serde(with = "hex")] transaction::Hash);
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