Request IndexedBlock directly from Client

example/managed.rs

@@ -4,12 +4,13 @@
 
 use kyoto::core::messages::NodeMessage;
 use kyoto::{chain::checkpoints::HeaderCheckpoint, core::builder::NodeBuilder};
-use kyoto::{AddrV2, Address, Network, ServiceFlags, TrustedPeer};
+use kyoto::{AddrV2, Address, BlockHash, Network, ServiceFlags, TrustedPeer};
 use std::collections::HashSet;
 use std::{net::Ipv4Addr, str::FromStr};
 
 const NETWORK: Network = Network::Signet;
-const RECOVERY_HEIGHT: u32 = 170_000;
+const RECOVERY_HEIGHT: u32 = 201_000;
+const RECOVERY_HASH: &str = "0000002238d05b522875f9edc4c9f418dd89ccfde7e4c305e8448a87a5dc71b7";
 const ADDR: &str = "tb1q9pvjqz5u5sdgpatg3wn0ce438u5cyv85lly0pc";
 
 #[tokio::main]
@@ -18,7 +19,8 @@ async fn main() {
     let subscriber = tracing_subscriber::FmtSubscriber::new();
     tracing::subscriber::set_global_default(subscriber).unwrap();
     // Use a predefined checkpoint
-    let checkpoint = HeaderCheckpoint::closest_checkpoint_below_height(RECOVERY_HEIGHT, NETWORK);
+    let checkpoint =
+        HeaderCheckpoint::new(RECOVERY_HEIGHT, BlockHash::from_str(RECOVERY_HASH).unwrap());
     // Add Bitcoin scripts to scan the blockchain for
     let address = Address::from_str(ADDR)
         .unwrap()
@@ -61,11 +63,12 @@ async fn main() {
                     tracing::info!("Connected to all required peers");
                 }
                 NodeMessage::IndexedFilter(mut filter) => {
-                    let height = filter.height();
-                    tracing::info!("Checking filter {}", height);
                     if filter.contains_any(&addresses).await {
-                        let hash = filter.block_hash();
+                        let hash = *filter.block_hash();
                         tracing::info!("Found script at {}!", hash);
+                        let indexed_block = client.request_block(hash).await.unwrap();
+                        let coinbase = indexed_block.block.txdata.first().unwrap().compute_txid();
+                        tracing::info!("Coinbase transaction ID: {}", coinbase);
                         break;
                     }
                 }

example/signet.rs

@@ -65,7 +65,10 @@ async fn main() {
                 NodeMessage::Dialog(d) => tracing::info!("{d}"),
                 NodeMessage::Warning(e) => tracing::warn!("{e}"),
                 NodeMessage::StateChange(s) => tracing::info!("State update: {s}"),
-                NodeMessage::Block(b) => drop(b),
+                NodeMessage::Block(b) => {
+                    let block = b.block.block_hash();
+                    tracing::info!("Received block: {block}");
+                }
                 NodeMessage::BlocksDisconnected(r) => {
                     let _ = r;
                 }

src/chain/block_queue.rs

@@ -3,12 +3,16 @@ use std::collections::VecDeque;
 use bitcoin::BlockHash;
 use tokio::time::Instant;
 
+#[cfg(feature = "filter-control")]
+use crate::core::messages::BlockRequest;
+use crate::core::messages::BlockSender;
+
 const SPAM_LIMIT: u64 = 5;
 
 #[derive(Debug)]
 pub(crate) struct BlockQueue {
-    queue: VecDeque<BlockHash>,
-    want: Option<BlockHash>,
+    queue: VecDeque<Request>,
+    want: Option<Request>,
     last_req: Instant,
 }
 
@@ -21,61 +25,107 @@ impl BlockQueue {
         }
     }
 
-    pub(crate) fn add(&mut self, block: BlockHash) {
-        if !self.contains(&block) {
-            self.queue.push_front(block)
+    pub(crate) fn add(&mut self, request: impl Into<Request>) {
+        let request: Request = request.into();
+        if !self.contains(&request.hash) {
+            self.queue.push_front(request)
         }
     }
 
     pub(crate) fn contains(&mut self, block: &BlockHash) -> bool {
-        self.queue.contains(block) || self.want.map_or(false, |hash| hash.eq(block))
+        self.queue.iter().any(|request| request.hash.eq(block))
+            || self
+                .want
+                .as_ref()
+                .map_or(false, |request| request.hash.eq(block))
     }
 
     pub(crate) fn pop(&mut self) -> Option<BlockHash> {
-        match self.want {
-            Some(block) => {
+        match self.want.as_mut() {
+            Some(request) => {
                 if Instant::now().duration_since(self.last_req).as_secs() < SPAM_LIMIT {
                     None
                 } else {
                     self.last_req = Instant::now();
-                    Some(block)
+                    Some(request.hash)
                 }
             }
             None => {
                 self.last_req = Instant::now();
-                let block = self.queue.pop_back();
-                self.want = block;
-                block
+                let request = self.queue.pop_back();
+                let hash = request.as_ref().map(|request| request.hash);
+                self.want = request;
+                hash
             }
         }
     }
 
     pub(crate) fn need(&self, block: &BlockHash) -> bool {
-        self.want.map_or(false, |hash| hash.eq(block))
+        self.want
+            .as_ref()
+            .map_or(false, |request| request.hash.eq(block))
     }
 
-    pub(crate) fn receive(&mut self, hash: &BlockHash) {
-        if let Some(want) = self.want {
-            if want.eq(hash) {
+    pub(crate) fn receive(&mut self, hash: &BlockHash) -> Option<BlockSender> {
+        if let Some(request) = self.want.take() {
+            if request.hash.eq(hash) {
                 self.want = None;
+                return request.sender;
+            } else {
+                self.want = Some(request);
+                return None;
             }
         }
+        None
     }
 
     pub(crate) fn complete(&self) -> bool {
         self.want.is_none() && self.queue.is_empty()
     }
 
     pub(crate) fn remove(&mut self, hashes: &[BlockHash]) {
-        self.queue.retain(|hash| !hashes.contains(hash));
-        if let Some(want) = self.want {
-            if hashes.contains(&want) {
+        self.queue.retain(|request| !hashes.contains(&request.hash));
+        if let Some(want) = self.want.as_ref() {
+            if hashes.contains(&want.hash) {
                 self.want = None;
             }
         }
     }
 }
 
+#[derive(Debug)]
+pub(crate) struct Request {
+    hash: BlockHash,
+    sender: Option<BlockSender>,
+}
+
+impl Request {
+    fn new(hash: BlockHash) -> Self {
+        Self { hash, sender: None }
+    }
+
+    #[cfg(feature = "filter-control")]
+    fn from_block_request(block_request: BlockRequest) -> Self {
+        Self {
+            hash: block_request.hash,
+            sender: Some(block_request.oneshot),
+        }
+    }
+}
+
+impl From<BlockHash> for Request {
+    fn from(value: BlockHash) -> Self {
+        Request::new(value)
+    }
+}
+
+#[cfg(feature = "filter-control")]
+impl From<BlockRequest> for Request {
+    fn from(value: BlockRequest) -> Self {
+        Request::from_block_request(value)
+    }
+}
+
 #[cfg(test)]
 mod test {
     use std::str::FromStr;
@@ -101,12 +151,18 @@ mod test {
         assert_eq!(queue.queue.len(), 3);
         assert_eq!(queue.pop(), Some(hash_1));
         assert_eq!(queue.pop(), None);
-        assert_eq!(queue.want, Some(hash_1));
+        assert_eq!(
+            queue.want.as_ref().map(|request| request.hash),
+            Some(hash_1)
+        );
         assert!(queue.need(&hash_1));
         queue.receive(&hash_1);
-        assert_eq!(queue.want, None);
+        assert_eq!(queue.want.as_ref().map(|request| request.hash), None);
         assert_eq!(queue.pop(), Some(hash_2));
-        assert_eq!(queue.want, Some(hash_2));
+        assert_eq!(
+            queue.want.as_ref().map(|request| request.hash),
+            Some(hash_2)
+        );
         assert!(queue.need(&hash_2));
         queue.receive(&hash_2);
         assert_eq!(queue.pop(), Some(hash_3));
@@ -145,13 +201,19 @@ mod test {
         assert_eq!(queue.pop(), Some(hash_1));
         tokio::time::sleep(Duration::from_secs(6)).await;
         assert_eq!(queue.pop(), Some(hash_1));
-        assert_eq!(queue.want, Some(hash_1));
+        assert_eq!(
+            queue.want.as_ref().map(|request| request.hash),
+            Some(hash_1)
+        );
         assert!(queue.need(&hash_1));
         queue.receive(&hash_1);
         assert!(!queue.need(&hash_1));
-        assert_eq!(queue.want, None);
+        assert_eq!(queue.want.as_ref().map(|request| request.hash), None);
         assert_eq!(queue.pop(), Some(hash_2));
-        assert_eq!(queue.want, Some(hash_2));
+        assert_eq!(
+            queue.want.as_ref().map(|request| request.hash),
+            Some(hash_2)
+        );
         assert!(queue.need(&hash_2));
         queue.receive(&hash_2);
         assert_eq!(queue.pop(), Some(hash_3));
@@ -187,10 +249,13 @@ mod test {
         queue.add(hash_1);
         assert_eq!(queue.queue.len(), 3);
         assert_eq!(queue.pop(), Some(hash_1));
-        assert_eq!(queue.want, Some(hash_1));
+        assert_eq!(
+            queue.want.as_ref().map(|request| request.hash),
+            Some(hash_1)
+        );
         queue.remove(&[hash_1]);
         assert!(!queue.need(&hash_1));
-        assert_eq!(queue.want, None);
+        assert_eq!(queue.want.as_ref().map(|request| request.hash), None);
         queue.remove(&[hash_2]);
         assert_eq!(queue.queue.len(), 1);
         assert_eq!(queue.pop(), Some(hash_3));

src/chain/chain.rs

@@ -18,6 +18,10 @@ use super::{
     header_chain::HeaderChain,
 };
 #[cfg(feature = "filter-control")]
+use crate::core::error::FetchBlockError;
+#[cfg(feature = "filter-control")]
+use crate::core::messages::BlockRequest;
+#[cfg(feature = "filter-control")]
 use crate::IndexedFilter;
 use crate::{
     chain::header_batch::HeadersBatch,
@@ -844,10 +848,20 @@ impl<H: HeaderStore> Chain<H> {
         if !block.check_merkle_root() {
             return Err(BlockScanError::InvalidMerkleRoot);
         }
-        self.block_queue.receive(&block_hash);
-        self.dialog
-            .send_data(NodeMessage::Block(IndexedBlock::new(height, block)))
-            .await;
+        let sender = self.block_queue.receive(&block_hash);
+        match sender {
+            Some(sender) => {
+                let send_result = sender.send(Ok(IndexedBlock::new(height, block)));
+                if send_result.is_err() {
+                    self.dialog.send_warning(Warning::ChannelDropped).await
+                };
+            }
+            None => {
+                self.dialog
+                    .send_data(NodeMessage::Block(IndexedBlock::new(height, block)))
+                    .await;
+            }
+        }
         Ok(())
     }
 
@@ -866,8 +880,19 @@ impl<H: HeaderStore> Chain<H> {
 
     // Explicitly request a block
     #[cfg(feature = "filter-control")]
-    pub(crate) fn get_block(&mut self, hash: BlockHash) {
-        self.block_queue.add(hash)
+    pub(crate) async fn get_block(&mut self, request: BlockRequest) {
+        let height_opt = self.height_of_hash(request.hash).await;
+        if height_opt.is_none() {
+            let err_reponse = request.oneshot.send(Err(FetchBlockError::UnknownHash));
+            if err_reponse.is_err() {
+                self.dialog.send_warning(Warning::ChannelDropped).await;
+            }
+        } else {
+            self.dialog
+                .send_dialog(format!("Adding block {} to queue", request.hash))
+                .await;
+            self.block_queue.add(request)
+        }
     }
 
     // Reset the compact filter queue because we received a new block

src/core/builder.rs

@@ -1,6 +1,10 @@
-use std::{collections::HashSet, path::PathBuf, time::Duration};
+#[cfg(not(feature = "filter-control"))]
+use std::collections::HashSet;
+use std::{path::PathBuf, time::Duration};
 
-use bitcoin::{Network, ScriptBuf};
+use bitcoin::Network;
+#[cfg(not(feature = "filter-control"))]
+use bitcoin::ScriptBuf;
 
 use super::{client::Client, config::NodeConfig, node::Node, FilterSyncPolicy};
 #[cfg(feature = "database")]

src/core/client.rs

@@ -1,6 +1,7 @@
 use bitcoin::block::Header;
 #[cfg(feature = "filter-control")]
 use bitcoin::BlockHash;
+#[cfg(not(feature = "filter-control"))]
 use bitcoin::ScriptBuf;
 use std::time::Duration;
 use tokio::sync::broadcast;
@@ -9,6 +10,8 @@ use tokio::sync::mpsc::Sender;
 
 use crate::{IndexedBlock, TrustedPeer, TxBroadcast};
 
+#[cfg(feature = "filter-control")]
+use super::{error::FetchBlockError, messages::BlockRequest};
 use super::{
     error::{ClientError, FetchHeaderError},
     messages::{ClientMessage, HeaderRequest, NodeMessage, SyncUpdate},
@@ -238,6 +241,26 @@ macro_rules! impl_core_client {
                     .map_err(|_| FetchHeaderError::RecvError)?
             }
 
+            /// Request a block be fetched.
+            ///
+            /// # Errors
+            ///
+            /// If the node has stopped running.
+            #[cfg(feature = "filter-control")]
+            pub async fn request_block(
+                &self,
+                block_hash: BlockHash,
+            ) -> Result<IndexedBlock, FetchBlockError> {
+                let (tx, rx) =
+                    tokio::sync::oneshot::channel::<Result<IndexedBlock, FetchBlockError>>();
+                let message = BlockRequest::new(tx, block_hash);
+                self.ntx
+                    .send(ClientMessage::GetBlock(message))
+                    .await
+                    .map_err(|_| FetchBlockError::SendError)?;
+                rx.await.map_err(|_| FetchBlockError::RecvError)?
+            }
+
             /// Starting at the configured anchor checkpoint, look for block inclusions with newly added scripts.
             ///
             /// # Errors
@@ -289,19 +312,6 @@ macro_rules! impl_core_client {
                     .await
                     .map_err(|_| ClientError::SendError)
             }
-
-            /// Request a block be fetched. The block will be emitted as a [`NodeMessage::Block`](crate::core::messages::NodeMessage) event.
-            ///
-            /// # Errors
-            ///
-            /// If the node has stopped running.
-            #[cfg(feature = "filter-control")]
-            pub async fn request_block(&self, block_hash: BlockHash) -> Result<(), ClientError> {
-                self.ntx
-                    .send(ClientMessage::GetBlock(block_hash))
-                    .await
-                    .map_err(|_| ClientError::SendError)
-            }
         }
     };
 }