Add post-IBD block migration

node/config_spec.toml

@@ -8,7 +8,7 @@ doc = "The path to your `bitcoin.hints` file that will be used for IBD. Default
 name = "blocks_dir"
 type = "String"
 default = "\"./blockfiles\".into()"
-doc = "Directory where you would like to store the bitcoin blocks. Default `./blockfiles`"
+doc = "Temporary directory where you would like to store the bitcoin blocks. Default `./blockfiles`"
 
 [[param]]
 name = "network"

node/src/bin/ibd.rs

@@ -1,6 +1,7 @@
 use std::{
     fs::File,
     path::PathBuf,
+    str::FromStr,
     sync::{mpsc::channel, Arc, Mutex},
     time::{Duration, Instant},
 };
@@ -10,8 +11,8 @@ use hintfile::Hints;
 use kernel::{ChainstateManager, ChainstateManagerOptions, ContextBuilder};
 
 use node::{
-    bootstrap_dns, elapsed_time, get_blocks_for_range, hashes_from_chain, sync_block_headers,
-    AccumulatorState, ChainExt,
+    bootstrap_dns, elapsed_time, emit_hashes_in_order, get_blocks_for_range, hashes_from_chain,
+    migrate_blocks, setup_validation_interface, sync_block_headers, AccumulatorState, ChainExt,
 };
 use p2p::net::TimeoutParams;
 
@@ -20,9 +21,14 @@ const PING_INTERVAL: Duration = Duration::from_secs(10 * 60);
 configure_me::include_config!();
 
 fn main() {
+    let subscriber = tracing_subscriber::FmtSubscriber::new();
+    tracing::subscriber::set_global_default(subscriber).unwrap();
     let (config, _) = Config::including_optional_config_files::<&[&str]>(&[]).unwrap_or_exit();
     let hint_path = config.hintfile;
     let blocks_dir = config.blocks_dir;
+    let home_var = std::env::var("HOME").unwrap();
+    let home_dir = PathBuf::from_str(&home_var).unwrap();
+    let bitcoind_dir = home_dir.join(".bitcoin");
     let network = config
         .network
         .parse::<Network>()
@@ -38,8 +44,6 @@ fn main() {
     timeout_conf.write_timeout(write_timeout);
     timeout_conf.tcp_handshake_timeout(tcp_timeout);
     timeout_conf.ping_interval(PING_INTERVAL);
-    let subscriber = tracing_subscriber::FmtSubscriber::new();
-    tracing::subscriber::set_global_default(subscriber).unwrap();
     let hintfile_start_time = Instant::now();
     tracing::info!("Reading in {hint_path}");
     let mut hintfile = File::open(hint_path).expect("invalid hintfile path");
@@ -58,9 +62,16 @@ fn main() {
     let kernel_start_time = Instant::now();
     let ctx = ContextBuilder::new()
         .chain_type(network.chain_type())
+        .validation_interface(setup_validation_interface())
         .build()
         .unwrap();
-    let options = ChainstateManagerOptions::new(&ctx, ".", "./blocks").unwrap();
+    let bitcoind_block_dir = bitcoind_dir.join("blocks");
+    let options = ChainstateManagerOptions::new(
+        &ctx,
+        bitcoind_dir.to_str().unwrap(),
+        bitcoind_block_dir.to_str().unwrap(),
+    )
+    .unwrap();
     let chainman = ChainstateManager::new(options).unwrap();
     elapsed_time(kernel_start_time);
     let tip = chainman.best_header().height();
@@ -74,7 +85,12 @@ fn main() {
     let acc_task = std::thread::spawn(move || accumulator_state.verify());
     let peers = Arc::new(Mutex::new(peers));
     let mut tasks = Vec::new();
-    let hashes = hashes_from_chain(Arc::clone(&chain), task_num);
+    let hashes = if matches!(network, Network::Bitcoin) {
+        hashes_from_chain(Arc::clone(&chain), task_num)
+    } else {
+        let hashes = emit_hashes_in_order(Arc::clone(&chain)).collect::<Vec<BlockHash>>();
+        hashes.chunks(10_000).map(|slice| slice.to_vec()).collect()
+    };
     for (task_id, chunk) in hashes.into_iter().enumerate() {
         let chain = Arc::clone(&chain);
         let tx = tx.clone();
@@ -107,4 +123,6 @@ fn main() {
     let acc_result = acc_task.join().unwrap();
     tracing::info!("Verified: {acc_result}");
     elapsed_time(main_routine_time);
+    tracing::info!("Migrating blocks to Bitcoin Core");
+    migrate_blocks(chain, &block_file_path);
 }

node/src/lib.rs

@@ -1,7 +1,7 @@
 use std::{
     collections::HashSet,
     fs::File,
-    io::Write,
+    io::{Read, Write},
     net::{IpAddr, Ipv4Addr, SocketAddr},
     path::Path,
     sync::{
@@ -198,7 +198,12 @@ pub fn get_blocks_for_range(
             continue;
         };
         // tracing::info!("Connection successful");
-        let payload = InventoryPayload(batch.iter().map(|hash| Inventory::Block(*hash)).collect());
+        let payload = InventoryPayload(
+            batch
+                .iter()
+                .map(|hash| Inventory::WitnessBlock(*hash))
+                .collect(),
+        );
         // tracing::info!("Requesting {} blocks", payload.0.len());
         let getdata = NetworkMessage::GetData(payload);
         if writer.send_message(getdata).is_err() {
@@ -232,9 +237,12 @@ pub fn get_blocks_for_range(
                             panic!("files cannot conflict");
                         }
                     };
-                    let block_bytes = consensus::serialize(&block);
+                    let block_bytes = consensus::encode::serialize(&block);
                     file.write_all(&block_bytes)
                         .expect("failed to write block file");
+                    file.flush().expect("failed to flush entire block to disk");
+                    file.sync_all().expect("file failed to sync with the OS");
+                    drop(file);
                     // tracing::info!("Wrote {hash} to file");
                     let (_, transactions) = block.into_parts();
                     let mut output_index = 0;
@@ -361,6 +369,73 @@ pub fn hashes_from_chain(chain: Arc<ChainstateManager>, jobs: usize) -> Vec<Vec<
     out
 }
 
+pub fn emit_hashes_in_order(chain: Arc<ChainstateManager>) -> impl Iterator<Item = BlockHash> {
+    let height = chain.best_header().height();
+    let mut hashes = Vec::with_capacity(height as usize);
+    let mut curr = chain.best_header();
+    let tip_hash = BlockHash::from_byte_array(curr.block_hash().hash);
+    hashes.push(tip_hash);
+    while let Ok(next) = curr.prev() {
+        if next.height() == 0 {
+            break;
+        }
+        let hash = BlockHash::from_byte_array(next.block_hash().hash);
+        hashes.push(hash);
+        curr = next;
+    }
+    hashes.into_iter().rev()
+}
+
+pub fn migrate_blocks(chain: Arc<ChainstateManager>, block_dir: &Path) {
+    let start = Instant::now();
+    for (i, hash) in emit_hashes_in_order(Arc::clone(&chain)).enumerate() {
+        let file_path = block_dir.join(format!("{hash}.block"));
+        let mut file =
+            File::open(&file_path).expect("block file not present. did IBD complete successfully?");
+        let mut block_bytes = Vec::new();
+        file.read_to_end(&mut block_bytes)
+            .expect("unexpected error parsing block file");
+        let block =
+            kernel::Block::try_from(block_bytes.as_slice()).expect("invalid block serialization");
+        let (accepted, _) = chain.process_block(&block);
+        if !accepted {
+            tracing::warn!("{hash} was rejected");
+            panic!("could not migrate blocks");
+        }
+        drop(file);
+        if let Err(e) = std::fs::remove_file(file_path) {
+            tracing::warn!("Could not remove block file {e}");
+        }
+        if i % 100 == 0 {
+            tracing::info!("{i}th block migrated");
+            elapsed_time(start);
+        }
+    }
+}
+
+pub fn setup_validation_interface() -> Box<kernel::ValidationInterfaceCallbacks> {
+    Box::new(kernel::ValidationInterfaceCallbacks {
+        block_checked: Box::new(move |_block, _mode, result| match result {
+            kernel::BlockValidationResult::MUTATED => tracing::warn!("Received mutated block"),
+            kernel::BlockValidationResult::CONSENSUS => tracing::warn!("Invalid consensus"),
+            kernel::BlockValidationResult::CACHED_INVALID => tracing::warn!("Cached as invalid"),
+            kernel::BlockValidationResult::INVALID_HEADER => {
+                tracing::warn!("Block header is malformed")
+            }
+            kernel::BlockValidationResult::TIME_FUTURE => tracing::warn!("Invalid timestamp"),
+            kernel::BlockValidationResult::MISSING_PREV => tracing::warn!("Missing previous block"),
+            kernel::BlockValidationResult::HEADER_LOW_WORK => {
+                tracing::warn!("Header has too-low work")
+            }
+            kernel::BlockValidationResult::INVALID_PREV => {
+                tracing::warn!("Invalid previous block hash")
+            }
+            // Result is unset (not rejected)
+            _ => (),
+        }),
+    })
+}
+
 pub trait ChainExt {
     fn chain_type(&self) -> ChainType;
 }