Add simple transaction lookup benchmark

examples/lookups.rs

@@ -0,0 +1,71 @@
+/// Benchmark full scan and point lookups.
+extern crate electrs;
+
+#[macro_use]
+extern crate log;
+
+extern crate bitcoin;
+extern crate error_chain;
+
+use bitcoin::util::hash::Sha256dHash;
+use electrs::{
+    config::Config,
+    daemon::Daemon,
+    errors::*,
+    index::TxRow,
+    metrics::Metrics,
+    signal::Waiter,
+    store::{DBStore, ReadStore},
+};
+
+use error_chain::ChainedError;
+use std::time::{Duration, Instant};
+
+fn run(config: Config) -> Result<()> {
+    if !config.db_path.exists() {
+        panic!(
+            "DB {:?} must exist when running this benchmark!",
+            config.db_path
+        );
+    }
+    let store = DBStore::open(&config.db_path, /*low_memory=*/ false);
+    let signal = Waiter::new();
+    let metrics = Metrics::new(config.monitoring_addr);
+    metrics.start();
+
+    let daemon = Daemon::new(
+        &config.daemon_dir,
+        config.daemon_rpc_addr,
+        config.cookie_getter(),
+        config.network_type,
+        signal.clone(),
+        &metrics,
+    )?;
+
+    let mut blockhash =
+        Sha256dHash::from_hex("00000000000000000133e9920d5d808d430e325027d513420e7fc2f7da231ffe")
+            .unwrap();
+
+    for _ in 0..100 {
+        let block = daemon.getblock(&blockhash)?;
+        let txhashes: Vec<Sha256dHash> = block.txdata.iter().map(|tx| tx.txid()).collect();
+        let len = txhashes.len() as u32;
+
+        let now = Instant::now();
+        for txhash in &txhashes {
+            let key = TxRow::filter_full(txhash);
+            let value = store.get(&key);
+            value.chain_err(|| format!("missing key {}", txhash))?;
+        }
+        let elapsed = now.elapsed();
+        info!("got {} txs @ {:?} secs ({:?} per tx)", len, elapsed, elapsed / len);
+        blockhash = block.header.prev_blockhash;
+    }
+    Ok(())
+}
+
+fn main() {
+    if let Err(e) = run(Config::from_args()) {
+        error!("{}", e.display_chain());
+    }
+}