change(rpc): Adds getmininginfo, getnetworksolps and getnetworkhashps methods

zebra-chain/src/work/difficulty.rs

@@ -547,3 +547,11 @@ impl std::ops::SubAssign<Work> for PartialCumulativeWork {
         *self = *self - rhs;
     }
 }
+
+impl std::ops::Deref for PartialCumulativeWork {
+    type Target = u128;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}

zebra-rpc/src/methods/get_block_template_rpcs.rs

@@ -53,6 +53,11 @@ pub(crate) mod zip317;
 /// > and clock time varies between nodes.
 const MAX_ESTIMATED_DISTANCE_TO_NETWORK_CHAIN_TIP: i32 = 100;
 
+/// The default window size specifying how many blocks to check when estimating the chain's solution rate.
+///
+/// Based on default value in zcashd.
+const DEFAULT_SOLUTION_RATE_WINDOW_SIZE: usize = 120;
+
 /// The RPC error code used by `zcashd` for when it's still downloading initial blocks.
 ///
 /// `s-nomp` mining pool expects error code `-10` when the node is not synced:
@@ -133,6 +138,38 @@ pub trait GetBlockTemplateRpc {
         hex_data: HexData,
         _options: Option<submit_block::JsonParameters>,
     ) -> BoxFuture<Result<submit_block::Response>>;
+
+    /// Returns mining-related information.
+    ///
+    /// zcashd reference: [`getmininginfo`](https://zcash.github.io/rpc/getmininginfo.html)
+    #[rpc(name = "getmininginfo")]
+    fn get_mining_info(&self) -> BoxFuture<Result<types::get_mining_info::Response>>;
+
+    /// Returns the estimated network solutions per second based on the last `num_blocks` before `height`.
+    /// If `num_blocks` is not supplied, uses 120 blocks.
+    /// If `height` is not supplied or is 0, uses the tip height.
+    ///
+    /// zcashd reference: [`getnetworksolps`](https://zcash.github.io/rpc/getnetworksolps.html)
+    #[rpc(name = "getnetworksolps")]
+    fn get_network_sol_ps(
+        &self,
+        num_blocks: Option<usize>,
+        height: Option<i32>,
+    ) -> BoxFuture<Result<u128>>;
+
+    /// Returns the estimated network solutions per second based on the last `num_blocks` before `height`.
+    /// If `num_blocks` is not supplied, uses 120 blocks.
+    /// If `height` is not supplied or is 0, uses the tip height.
+    ///
+    /// zcashd reference: [`getnetworkhashps`](https://zcash.github.io/rpc/getnetworkhashps.html)
+    #[rpc(name = "getnetworkhashps")]
+    fn get_network_hash_ps(
+        &self,
+        num_blocks: Option<usize>,
+        height: Option<i32>,
+    ) -> BoxFuture<Result<u128>> {
+        self.get_network_sol_ps(num_blocks, height)
+    }
 }
 
 /// RPC method implementations.
@@ -529,6 +566,56 @@ where
         }
         .boxed()
     }
+
+    fn get_mining_info(&self) -> BoxFuture<Result<types::get_mining_info::Response>> {
+        let network = self.network;
+        let solution_rate_fut = self.get_network_sol_ps(None, None);
+        async move {
+            Ok(types::get_mining_info::Response::new(
+                network,
+                solution_rate_fut.await?,
+            ))
+        }
+        .boxed()
+    }
+
+    fn get_network_sol_ps(
+        &self,
+        num_blocks: Option<usize>,
+        height: Option<i32>,
+    ) -> BoxFuture<Result<u128>> {
+        let num_blocks = num_blocks
+            .map(|num_blocks| num_blocks.max(1))
+            .unwrap_or(DEFAULT_SOLUTION_RATE_WINDOW_SIZE);
+        let height = height.and_then(|height| (height > 1).then_some(Height(height as u32)));
+        let mut state = self.state.clone();
+
+        async move {
+            let request = ReadRequest::SolutionRate { num_blocks, height };
+
+            let response = state
+                .ready()
+                .and_then(|service| service.call(request))
+                .await
+                .map_err(|error| Error {
+                    code: ErrorCode::ServerError(0),
+                    message: error.to_string(),
+                    data: None,
+                })?;
+
+            let solution_rate = match response {
+                ReadResponse::SolutionRate(solution_rate) => solution_rate.ok_or(Error {
+                    code: ErrorCode::ServerError(0),
+                    message: "No blocks in state".to_string(),
+                    data: None,
+                })?,
+                _ => unreachable!("unmatched response to a solution rate request"),
+            };
+
+            Ok(solution_rate)
+        }
+        .boxed()
+    }
 }
 
 // get_block_template support methods

zebra-rpc/src/methods/get_block_template_rpcs/types.rs

@@ -3,6 +3,7 @@
 pub mod default_roots;
 pub mod get_block_template;
 pub mod get_block_template_opts;
+pub mod get_mining_info;
 pub mod hex_data;
 pub mod submit_block;
 pub mod transaction;

zebra-rpc/src/methods/get_block_template_rpcs/types/get_mining_info.rs

@@ -0,0 +1,31 @@
+//! Response type for the `getmininginfo` RPC.
+
+use zebra_chain::parameters::Network;
+
+/// Response to a `getmininginfo` RPC request.
+#[derive(Debug, PartialEq, Eq, serde::Serialize)]
+pub struct Response {
+    /// The estimated network solution rate in Sol/s.
+    networksolps: u128,
+
+    /// The estimated network solution rate in Sol/s.
+    networkhashps: u128,
+
+    /// Current network name as defined in BIP70 (main, test, regtest)
+    chain: Network,
+
+    /// If using testnet or not
+    testnet: bool,
+}
+
+impl Response {
+    /// Creates a new `getmininginfo` response
+    pub fn new(chain: Network, networksolps: u128) -> Self {
+        Self {
+            networksolps,
+            networkhashps: networksolps,
+            chain,
+            testnet: chain == Network::Testnet,
+        }
+    }
+}

zebra-rpc/src/methods/tests/snapshot/get_block_template_rpcs.rs

@@ -29,7 +29,9 @@ use zebra_test::mock_service::{MockService, PanicAssertion};
 use crate::methods::{
     get_block_template_rpcs::{
         self,
-        types::{get_block_template::GetBlockTemplate, hex_data::HexData, submit_block},
+        types::{
+            get_block_template::GetBlockTemplate, get_mining_info, hex_data::HexData, submit_block,
+        },
     },
     tests::utils::fake_history_tree,
     GetBlockHash, GetBlockTemplateRpc, GetBlockTemplateRpcImpl,
@@ -127,9 +129,22 @@ pub async fn test_responses<State, ReadState>(
         .get_block_hash(BLOCK_HEIGHT10)
         .await
         .expect("We should have a GetBlockHash struct");
-
     snapshot_rpc_getblockhash(get_block_hash, &settings);
 
+    // `getmininginfo`
+    let get_mining_info = get_block_template_rpc
+        .get_mining_info()
+        .await
+        .expect("We should have a success response");
+    snapshot_rpc_getmininginfo(get_mining_info, &settings);
+
+    // `getnetworksolps` (and `getnetworkhashps`)
+    let get_network_sol_ps = get_block_template_rpc
+        .get_network_sol_ps(None, None)
+        .await
+        .expect("We should have a success response");
+    snapshot_rpc_getnetworksolps(get_network_sol_ps, &settings);
+
     // get a new empty state
     let new_read_state = MockService::build().for_unit_tests();
 
@@ -225,3 +240,16 @@ fn snapshot_rpc_submit_block_invalid(
         insta::assert_json_snapshot!("snapshot_rpc_submit_block_invalid", submit_block_response)
     });
 }
+
+/// Snapshot `getmininginfo` response, using `cargo insta` and JSON serialization.
+fn snapshot_rpc_getmininginfo(
+    get_mining_info: get_mining_info::Response,
+    settings: &insta::Settings,
+) {
+    settings.bind(|| insta::assert_json_snapshot!("get_mining_info", get_mining_info));
+}
+
+/// Snapshot `getnetworksolps` response, using `cargo insta` and JSON serialization.
+fn snapshot_rpc_getnetworksolps(get_network_sol_ps: u128, settings: &insta::Settings) {
+    settings.bind(|| insta::assert_json_snapshot!("get_network_sol_ps", get_network_sol_ps));
+}

zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@mainnet_10.snap

@@ -0,0 +1,9 @@
+---
+source: zebra-rpc/src/methods/tests/snapshot/get_block_template_rpcs.rs
+expression: get_mining_info
+---
+{
+  "networksolps": 2,
+  "networkhashps": 2,
+  "chain": "Mainnet"
+}

zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@testnet_10.snap

@@ -0,0 +1,9 @@
+---
+source: zebra-rpc/src/methods/tests/snapshot/get_block_template_rpcs.rs
+expression: get_mining_info
+---
+{
+  "networksolps": 0,
+  "networkhashps": 0,
+  "chain": "Testnet"
+}

zebra-rpc/src/methods/tests/snapshot/snapshots/get_network_sol_ps@mainnet_10.snap

@@ -0,0 +1,5 @@
+---
+source: zebra-rpc/src/methods/tests/snapshot/get_block_template_rpcs.rs
+expression: get_network_sol_ps
+---
+2

zebra-rpc/src/methods/tests/snapshot/snapshots/get_network_sol_ps@testnet_10.snap

@@ -0,0 +1,5 @@
+---
+source: zebra-rpc/src/methods/tests/snapshot/get_block_template_rpcs.rs
+expression: get_network_sol_ps
+---
+0

zebra-rpc/src/methods/tests/vectors.rs

@@ -788,6 +788,95 @@ async fn rpc_getblockhash() {
     mempool.expect_no_requests().await;
 }
 
+#[cfg(feature = "getblocktemplate-rpcs")]
+#[tokio::test(flavor = "multi_thread")]
+async fn rpc_getmininginfo() {
+    let _init_guard = zebra_test::init();
+
+    // Create a continuous chain of mainnet blocks from genesis
+    let blocks: Vec<Arc<Block>> = zebra_test::vectors::CONTINUOUS_MAINNET_BLOCKS
+        .iter()
+        .map(|(_height, block_bytes)| block_bytes.zcash_deserialize_into().unwrap())
+        .collect();
+
+    // Create a populated state service
+    let (_state, read_state, latest_chain_tip, _chain_tip_change) =
+        zebra_state::populated_state(blocks.clone(), Mainnet).await;
+
+    // Init RPC
+    let get_block_template_rpc = get_block_template_rpcs::GetBlockTemplateRpcImpl::new(
+        Mainnet,
+        Default::default(),
+        Buffer::new(MockService::build().for_unit_tests(), 1),
+        read_state,
+        latest_chain_tip.clone(),
+        MockService::build().for_unit_tests(),
+        MockSyncStatus::default(),
+    );
+
+    get_block_template_rpc
+        .get_mining_info()
+        .await
+        .expect("get_mining_info call should succeed");
+}
+
+#[cfg(feature = "getblocktemplate-rpcs")]
+#[tokio::test(flavor = "multi_thread")]
+async fn rpc_getnetworksolps() {
+    let _init_guard = zebra_test::init();
+
+    // Create a continuous chain of mainnet blocks from genesis
+    let blocks: Vec<Arc<Block>> = zebra_test::vectors::CONTINUOUS_MAINNET_BLOCKS
+        .iter()
+        .map(|(_height, block_bytes)| block_bytes.zcash_deserialize_into().unwrap())
+        .collect();
+
+    // Create a populated state service
+    let (_state, read_state, latest_chain_tip, _chain_tip_change) =
+        zebra_state::populated_state(blocks.clone(), Mainnet).await;
+
+    // Init RPC
+    let get_block_template_rpc = get_block_template_rpcs::GetBlockTemplateRpcImpl::new(
+        Mainnet,
+        Default::default(),
+        Buffer::new(MockService::build().for_unit_tests(), 1),
+        read_state,
+        latest_chain_tip.clone(),
+        MockService::build().for_unit_tests(),
+        MockSyncStatus::default(),
+    );
+
+    let get_network_sol_ps_inputs = [
+        (None, None),
+        (Some(0), None),
+        (Some(0), Some(0)),
+        (Some(0), Some(-1)),
+        (Some(0), Some(10)),
+        (Some(0), Some(i32::MAX)),
+        (Some(1), None),
+        (Some(1), Some(0)),
+        (Some(1), Some(-1)),
+        (Some(1), Some(10)),
+        (Some(1), Some(i32::MAX)),
+        (Some(usize::MAX), None),
+        (Some(usize::MAX), Some(0)),
+        (Some(usize::MAX), Some(-1)),
+        (Some(usize::MAX), Some(10)),
+        (Some(usize::MAX), Some(i32::MAX)),
+    ];
+
+    for (num_blocks_input, height_input) in get_network_sol_ps_inputs {
+        let get_network_sol_ps_result = get_block_template_rpc
+            .get_network_sol_ps(num_blocks_input, height_input)
+            .await;
+        assert!(
+            get_network_sol_ps_result
+                .is_ok(),
+            "get_network_sol_ps({num_blocks_input:?}, {height_input:?}) call with should be ok, got: {get_network_sol_ps_result:?}"
+        );
+    }
+}
+
 #[cfg(feature = "getblocktemplate-rpcs")]
 #[tokio::test(flavor = "multi_thread")]
 async fn rpc_getblocktemplate() {

zebra-state/src/request.rs

@@ -779,6 +779,17 @@ pub enum ReadRequest {
     /// [`zebra-state::GetBlockTemplateChainInfo`](zebra-state::GetBlockTemplateChainInfo)` structure containing
     /// best chain state information.
     ChainInfo,
+
+    #[cfg(feature = "getblocktemplate-rpcs")]
+    /// Get the average solution rate in the best chain.
+    ///
+    /// Returns [`ReadResponse::SolutionRate`]
+    SolutionRate {
+        /// Specifies over difficulty averaging window.
+        num_blocks: usize,
+        /// Optionally estimate the network speed at the time when a certain block was found
+        height: Option<block::Height>,
+    },
 }
 
 impl ReadRequest {
@@ -806,6 +817,8 @@ impl ReadRequest {
             ReadRequest::BestChainBlockHash(_) => "best_chain_block_hash",
             #[cfg(feature = "getblocktemplate-rpcs")]
             ReadRequest::ChainInfo => "chain_info",
+            #[cfg(feature = "getblocktemplate-rpcs")]
+            ReadRequest::SolutionRate { .. } => "solution_rate",
         }
     }
 

zebra-state/src/response.rs

@@ -133,6 +133,10 @@ pub enum ReadResponse {
     /// Response to [`ReadRequest::ChainInfo`](crate::ReadRequest::ChainInfo) with the state
     /// information needed by the `getblocktemplate` RPC method.
     ChainInfo(GetBlockTemplateChainInfo),
+
+    #[cfg(feature = "getblocktemplate-rpcs")]
+    /// Response to [`ReadRequest::SolutionRate`](crate::ReadRequest::SolutionRate)
+    SolutionRate(Option<u128>),
 }
 
 #[cfg(feature = "getblocktemplate-rpcs")]
@@ -204,7 +208,7 @@ impl TryFrom<ReadResponse> for Response {
                 Err("there is no corresponding Response for this ReadResponse")
             }
             #[cfg(feature = "getblocktemplate-rpcs")]
-            ReadResponse::ChainInfo(_) => {
+            ReadResponse::ChainInfo(_) | ReadResponse::SolutionRate(_) => {
                 Err("there is no corresponding Response for this ReadResponse")
             }
         }