feat: add cli example for esplora

Co-authored-by: remix <[email protected]>

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "crates/esplora",
     "example-crates/example_cli",
     "example-crates/example_electrum",
+    "example-crates/example_esplora",
     "example-crates/wallet_electrum",
     "example-crates/wallet_esplora",
     "example-crates/wallet_esplora_async",

example-crates/example_esplora/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "example_esplora"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bdk_chain = { path = "../../crates/chain", features = ["serde"] }
+bdk_esplora = { path = "../../crates/esplora", features = ["blocking"] }
+example_cli = { path = "../example_cli" }
+

example-crates/example_esplora/src/main.rs

@@ -0,0 +1,341 @@
+use std::{
+    collections::BTreeMap,
+    io::{self, Write},
+    sync::Mutex,
+};
+
+use bdk_chain::{
+    bitcoin::{Address, Network, OutPoint, Txid},
+    indexed_tx_graph::{IndexedAdditions, IndexedTxGraph},
+    keychain::LocalChangeSet,
+    local_chain::{CheckPoint, LocalChain},
+    Append, ConfirmationTimeAnchor,
+};
+
+use bdk_esplora::{esplora_client, EsploraExt};
+
+use example_cli::{
+    anyhow::{self, Context},
+    clap::{self, Parser, Subcommand},
+    Keychain,
+};
+
+const DB_MAGIC: &[u8] = b"bdk_example_esplora";
+const DB_PATH: &str = ".bdk_esplora_example.db";
+
+#[derive(Subcommand, Debug, Clone)]
+enum EsploraCommands {
+    /// Scans the addresses in the wallet sing the esplora API.
+    Scan {
+        /// When a gap this large has been found for a keychain, it will stop.
+        #[clap(long, default_value = "5")]
+        stop_gap: usize,
+        #[clap(flatten)]
+        scan_options: ScanOptions,
+    },
+    /// Scans particular addresses using the esplora API.
+    Sync {
+        /// Scan all the unused addresses.
+        #[clap(long)]
+        unused_spks: bool,
+        /// Scan every address that you have derived.
+        #[clap(long)]
+        all_spks: bool,
+        /// Scan unspent outpoints for spends or changes to confirmation status of residing tx.
+        #[clap(long)]
+        utxos: bool,
+        /// Scan unconfirmed transactions for updates.
+        #[clap(long)]
+        unconfirmed: bool,
+        #[clap(flatten)]
+        scan_options: ScanOptions,
+    },
+}
+
+#[derive(Parser, Debug, Clone, PartialEq)]
+pub struct ScanOptions {
+    /// Max number of concurrent esplora server requests.
+    #[clap(long, default_value = "1")]
+    pub parallel_requests: usize,
+}
+
+fn main() -> anyhow::Result<()> {
+    let (args, keymap, index, db, init_changeset) = example_cli::init::<
+        EsploraCommands,
+        LocalChangeSet<Keychain, ConfirmationTimeAnchor>,
+    >(DB_MAGIC, DB_PATH)?;
+
+    let graph = Mutex::new({
+        let mut graph = IndexedTxGraph::new(index);
+        graph.apply_additions(init_changeset.indexed_additions);
+        graph
+    });
+
+    let chain = Mutex::new({
+        let mut chain = LocalChain::default();
+        chain.apply_changeset(&init_changeset.chain_changeset);
+        chain
+    });
+
+    let esplora_url = match args.network {
+        Network::Bitcoin => "https://blockstream.info/api",
+        Network::Testnet => "https://blockstream.info/testnet/api",
+        Network::Regtest => "http://localhost:3002",
+        Network::Signet => "https://mempool.space/signet/api",
+    };
+
+    let client = esplora_client::Builder::new(esplora_url).build_blocking()?;
+
+    // Match the given command. Exectute and return if command is provided by example_cli
+    let esplora_cmd = match &args.command {
+        // Command that are handled by the specify example
+        example_cli::Commands::ChainSpecific(electrum_cmd) => electrum_cmd,
+        // General commands handled by example_cli. Execute the cmd and return.
+        general_cmd => {
+            let res = example_cli::handle_commands(
+                &graph,
+                &db,
+                &chain,
+                &keymap,
+                args.network,
+                |tx| {
+                    client
+                        .broadcast(tx)
+                        .map(|_| ())
+                        .map_err(anyhow::Error::from)
+                },
+                general_cmd.clone(),
+            );
+
+            db.lock().unwrap().commit()?;
+            return res;
+        }
+    };
+
+    let (update_graph, update_keychain_indices) = match &esplora_cmd {
+        EsploraCommands::Scan {
+            stop_gap,
+            scan_options,
+        } => {
+            let graph = graph.lock().unwrap();
+
+            let keychain_spks = graph
+                .index
+                .spks_of_all_keychains()
+                .into_iter()
+                .map(|(keychain, iter)| {
+                    let mut first = true;
+                    let spk_iter = iter.inspect(move |(i, _)| {
+                        if first {
+                            eprint!("\nscanning {}: ", keychain);
+                            first = false;
+                        }
+                        eprint!("{} ", i);
+                        let _ = io::stdout().flush();
+                    });
+                    (keychain, spk_iter)
+                })
+                .collect::<BTreeMap<_, _>>();
+
+            drop(graph);
+
+            client
+                .update_tx_graph(
+                    keychain_spks,
+                    core::iter::empty(),
+                    core::iter::empty(),
+                    *stop_gap,
+                    scan_options.parallel_requests,
+                )
+                .context("scanning for transactions")?
+        }
+        EsploraCommands::Sync {
+            mut unused_spks,
+            all_spks,
+            mut utxos,
+            mut unconfirmed,
+            scan_options,
+        } => {
+            // Get a short lock on the tracker to get the spks we're interested in
+            let graph = graph.lock().unwrap();
+            let chain = chain.lock().unwrap();
+            let chain_tip = chain.tip().map(|cp| cp.block_id()).unwrap_or_default();
+
+            if !(*all_spks || unused_spks || utxos || unconfirmed) {
+                unused_spks = true;
+                unconfirmed = true;
+                utxos = true;
+            } else if *all_spks {
+                unused_spks = false;
+            }
+
+            let mut spks: Box<dyn Iterator<Item = bdk_chain::bitcoin::Script>> =
+                Box::new(core::iter::empty());
+            if *all_spks {
+                let all_spks = graph
+                    .index
+                    .all_spks()
+                    .iter()
+                    .map(|(k, v)| (*k, v.clone()))
+                    .collect::<Vec<_>>();
+                spks = Box::new(spks.chain(all_spks.into_iter().map(|(index, script)| {
+                    eprintln!("scanning {:?}", index);
+                    script
+                })));
+            }
+            if unused_spks {
+                let unused_spks = graph
+                    .index
+                    .unused_spks(..)
+                    .map(|(k, v)| (*k, v.clone()))
+                    .collect::<Vec<_>>();
+                spks = Box::new(spks.chain(unused_spks.into_iter().map(|(index, script)| {
+                    eprintln!(
+                        "Checking if address {} {:?} has been used",
+                        Address::from_script(&script, args.network).unwrap(),
+                        index
+                    );
+
+                    script
+                })));
+            }
+
+            let mut outpoints: Box<dyn Iterator<Item = OutPoint>> = Box::new(core::iter::empty());
+
+            if utxos {
+                let init_outpoints = graph.index.outpoints().iter().cloned();
+
+                let utxos = graph
+                    .graph()
+                    .filter_chain_unspents(&*chain, chain_tip, init_outpoints)
+                    .map(|(_, utxo)| utxo)
+                    .collect::<Vec<_>>();
+
+                outpoints = Box::new(
+                    utxos
+                        .into_iter()
+                        .inspect(|utxo| {
+                            eprintln!(
+                                "Checking if outpoint {} (value: {}) has been spent",
+                                utxo.outpoint, utxo.txout.value
+                            );
+                        })
+                        .map(|utxo| utxo.outpoint),
+                );
+            };
+
+            let mut txids: Box<dyn Iterator<Item = Txid>> = Box::new(core::iter::empty());
+
+            if unconfirmed {
+                let unconfirmed_txids = graph
+                    .graph()
+                    .list_chain_txs(&*chain, chain_tip)
+                    .filter(|canonical_tx| !canonical_tx.observed_as.is_confirmed())
+                    .map(|canonical_tx| canonical_tx.node.txid)
+                    .collect::<Vec<Txid>>();
+
+                txids = Box::new(unconfirmed_txids.into_iter().inspect(|txid| {
+                    eprintln!("Checking if {} is confirmed yet", txid);
+                }));
+            }
+
+            // drop lock on graph and chain
+            drop((graph, chain));
+
+            (
+                client
+                    .update_tx_graph_without_keychain(
+                        spks,
+                        txids,
+                        outpoints,
+                        scan_options.parallel_requests,
+                    )
+                    .context("syncing transaction updates")?,
+                Default::default(),
+            )
+        }
+    };
+
+    println!();
+
+    let (heights_to_fetch, tip) = {
+        let chain = &*chain.lock().unwrap();
+        let heights_to_fetch = update_graph.missing_heights(chain).collect::<Vec<_>>();
+        let tip = chain.tip();
+        (heights_to_fetch, tip)
+    };
+
+    #[cfg(debug_assertions)]
+    println!(
+        "old chain: {:?}",
+        tip.iter()
+            .flat_map(CheckPoint::iter)
+            .map(|cp| cp.height())
+            .collect::<Vec<_>>()
+    );
+    println!("prev tip: {}", tip.as_ref().map_or(0, CheckPoint::height));
+    println!("missing blocks: {:?}", heights_to_fetch);
+
+    let update = client
+        .update_local_chain(tip, heights_to_fetch)
+        .context("scanning for blocks")?;
+
+    #[cfg(debug_assertions)]
+    println!(
+        "new chain: {:?}",
+        update.tip.iter().map(|cp| cp.height()).collect::<Vec<_>>()
+    );
+    println!("new tip: {}", update.tip.height());
+
+    // check that all anchors are part of the new tip's history
+    #[cfg(debug_assertions)]
+    {
+        use bdk_chain::bitcoin::BlockHash;
+        use bdk_chain::collections::HashMap;
+        let chain_heights = update
+            .tip
+            .iter()
+            .map(|cp| (cp.height(), cp.hash()))
+            .collect::<HashMap<u32, BlockHash>>();
+        for (anchor, _) in update_graph.all_anchors() {
+            assert_eq!(anchor.anchor_block.height, anchor.confirmation_height);
+            assert!(chain_heights.contains_key(&anchor.anchor_block.height));
+
+            let remote_hash = chain_heights
+                .get(&anchor.confirmation_height)
+                .expect("must have block");
+
+            // inform about mismatched blocks
+            if remote_hash != &anchor.anchor_block.hash {
+                println!("mismatched block @ {}!", anchor.confirmation_height);
+                println!("\t- anchor_block: {}", anchor.anchor_block.hash);
+                println!("\t-   from_chain: {}", remote_hash);
+            }
+        }
+    }
+
+    let db_changeset: LocalChangeSet<Keychain, ConfirmationTimeAnchor> = {
+        let mut chain = chain.lock().unwrap();
+        let mut graph = graph.lock().unwrap();
+
+        let chain_changeset = chain.apply_update(update)?;
+
+        let indexed_additions = {
+            let mut additions = IndexedAdditions::default();
+            let (_, index_additions) = graph.index.reveal_to_target_multi(&update_keychain_indices);
+            additions.append(IndexedAdditions::from(index_additions));
+            additions.append(graph.apply_update(update_graph));
+            additions
+        };
+
+        LocalChangeSet {
+            chain_changeset,
+            indexed_additions,
+        }
+    };
+
+    let mut db = db.lock().unwrap();
+    db.stage(db_changeset);
+    db.commit()?;
+    Ok(())
+}