Make `capture_logs` available for the whole crate

swap/src/bin/swap.rs

@@ -484,14 +484,13 @@ mod tests {
     use super::*;
     use crate::determine_btc_to_swap;
     use ::bitcoin::Amount;
-    use std::io;
     use std::sync::Mutex;
-    use tracing::subscriber;
-    use tracing_subscriber::fmt::MakeWriter;
+    use swap::tracing_ext::capture_logs;
+    use tracing::level_filters::LevelFilter;
 
     #[tokio::test]
     async fn given_no_balance_and_transfers_less_than_max_swaps_max_giveable() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::ZERO,
             Amount::from_btc(0.0009).unwrap(),
@@ -526,7 +525,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_no_balance_and_transfers_more_then_swaps_max_quantity_from_quote() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::ZERO,
             Amount::from_btc(0.1).unwrap(),
@@ -561,7 +560,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_initial_balance_below_max_quantity_swaps_max_givable() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::from_btc(0.0049).unwrap(),
             Amount::from_btc(99.9).unwrap(),
@@ -594,7 +593,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_initial_balance_above_max_quantity_swaps_max_quantity() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::from_btc(0.1).unwrap(),
             Amount::from_btc(99.9).unwrap(),
@@ -627,7 +626,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_no_initial_balance_then_min_wait_for_sufficient_deposit() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::ZERO,
             Amount::from_btc(0.01).unwrap(),
@@ -662,7 +661,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_balance_less_then_min_wait_for_sufficient_deposit() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::from_btc(0.0001).unwrap(),
             Amount::from_btc(0.01).unwrap(),
@@ -697,7 +696,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_no_initial_balance_and_transfers_less_than_min_keep_waiting() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::ZERO,
             Amount::from_btc(0.01).unwrap(),
@@ -737,7 +736,7 @@ mod tests {
 
     #[tokio::test]
     async fn given_longer_delay_until_deposit_should_not_spam_user() {
-        let writer = capture_logs();
+        let writer = capture_logs(LevelFilter::INFO);
         let givable = Arc::new(Mutex::new(MaxGiveable::new(vec![
             Amount::ZERO,
             Amount::ZERO,
@@ -779,63 +778,6 @@ mod tests {
         );
     }
 
-    /// Setup tracing with a capturing writer, allowing assertions on the log
-    /// messages.
-    ///
-    /// Time and ANSI are disabled to make the output more predictable and
-    /// readable.
-    fn capture_logs() -> MakeCapturingWriter {
-        let make_writer = MakeCapturingWriter::default();
-
-        let guard = subscriber::set_default(
-            tracing_subscriber::fmt()
-                .with_ansi(false)
-                .without_time()
-                .with_writer(make_writer.clone())
-                .finish(),
-        );
-        // don't clean up guard we stay initialized
-        std::mem::forget(guard);
-
-        make_writer
-    }
-
-    #[derive(Default, Clone)]
-    struct MakeCapturingWriter {
-        writer: CapturingWriter,
-    }
-
-    impl MakeCapturingWriter {
-        fn captured(&self) -> String {
-            let captured = &self.writer.captured;
-            let cursor = captured.lock().unwrap();
-            String::from_utf8(cursor.clone().into_inner()).unwrap()
-        }
-    }
-
-    impl MakeWriter for MakeCapturingWriter {
-        type Writer = CapturingWriter;
-
-        fn make_writer(&self) -> Self::Writer {
-            self.writer.clone()
-        }
-    }
-
-    #[derive(Default, Clone)]
-    struct CapturingWriter {
-        captured: Arc<Mutex<io::Cursor<Vec<u8>>>>,
-    }
-
-    impl io::Write for CapturingWriter {
-        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-            self.captured.lock().unwrap().write(buf)
-        }
-
-        fn flush(&mut self) -> io::Result<()> {
-            Ok(())
-        }
-    }
-
     struct MaxGiveable {
         amounts: Vec<Amount>,
         call_counter: usize,

swap/src/lib.rs

@@ -29,5 +29,6 @@ pub mod network;
 pub mod protocol;
 pub mod seed;
 pub mod tor;
+pub mod tracing_ext;
 
 mod monero_ext;

swap/src/tracing_ext.rs

@@ -0,0 +1,65 @@
+#![allow(clippy::unwrap_used)] // This is only meant to be used in tests.
+
+use std::io;
+use std::sync::{Arc, Mutex};
+use tracing::subscriber;
+use tracing_subscriber::filter::LevelFilter;
+use tracing_subscriber::fmt::MakeWriter;
+
+/// Setup tracing with a capturing writer, allowing assertions on the log
+/// messages.
+///
+/// Time and ANSI are disabled to make the output more predictable and
+/// readable.
+pub fn capture_logs(min_level: LevelFilter) -> MakeCapturingWriter {
+    let make_writer = MakeCapturingWriter::default();
+
+    let guard = subscriber::set_default(
+        tracing_subscriber::fmt()
+            .with_ansi(false)
+            .without_time()
+            .with_writer(make_writer.clone())
+            .with_env_filter(format!("{}", min_level))
+            .finish(),
+    );
+    // don't clean up guard we stay initialized
+    std::mem::forget(guard);
+
+    make_writer
+}
+
+#[derive(Default, Clone)]
+pub struct MakeCapturingWriter {
+    writer: CapturingWriter,
+}
+
+impl MakeCapturingWriter {
+    pub fn captured(&self) -> String {
+        let captured = &self.writer.captured;
+        let cursor = captured.lock().unwrap();
+        String::from_utf8(cursor.clone().into_inner()).unwrap()
+    }
+}
+
+impl MakeWriter for MakeCapturingWriter {
+    type Writer = CapturingWriter;
+
+    fn make_writer(&self) -> Self::Writer {
+        self.writer.clone()
+    }
+}
+
+#[derive(Default, Clone)]
+pub struct CapturingWriter {
+    captured: Arc<Mutex<io::Cursor<Vec<u8>>>>,
+}
+
+impl io::Write for CapturingWriter {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.captured.lock().unwrap().write(buf)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}