Fix LSP and Clippy warnings and errors

src/atomic64.rs

@@ -241,8 +241,8 @@ impl AtomicU64 {
 
 #[cfg(test)]
 mod test {
+    use std::f64;
     use std::f64::consts::PI;
-    use std::f64::{self, EPSILON};
 
     use super::*;
 
@@ -251,7 +251,7 @@ mod test {
         let table: Vec<f64> = vec![0.0, 1.0, PI, f64::MIN, f64::MAX];
 
         for f in table {
-            assert!((f - AtomicF64::new(f).get()).abs() < EPSILON);
+            assert!((f - AtomicF64::new(f).get()).abs() < f64::EPSILON);
         }
     }
 

src/counter.rs

@@ -323,7 +323,7 @@ impl<P: Atomic> Clone for GenericLocalCounterVec<P> {
 #[cfg(test)]
 mod tests {
     use std::collections::HashMap;
-    use std::f64::EPSILON;
+    use std::f64;
 
     use super::*;
     use crate::metrics::{Collector, Opts};
@@ -343,7 +343,7 @@ mod tests {
         assert_eq!(mfs.len(), 1);
 
         let mf = mfs.pop().unwrap();
-        let m = mf.get_metric().get(0).unwrap();
+        let m = mf.get_metric().first().unwrap();
         assert_eq!(m.get_label().len(), 2);
         assert_eq!(m.get_counter().get_value() as u64, 43);
 
@@ -363,12 +363,12 @@ mod tests {
         assert_eq!(mfs.len(), 1);
 
         let mf = mfs.pop().unwrap();
-        let m = mf.get_metric().get(0).unwrap();
+        let m = mf.get_metric().first().unwrap();
         assert_eq!(m.get_label().len(), 0);
         assert_eq!(m.get_counter().get_value() as u64, 12);
 
         counter.reset();
-        assert_eq!(counter.get() as u64, 0);
+        assert_eq!(counter.get(), 0);
     }
 
     #[test]
@@ -414,9 +414,9 @@ mod tests {
 
         local_counter.reset();
         counter.reset();
-        assert_eq!(counter.get() as u64, 0);
+        assert_eq!(counter.get(), 0);
         local_counter.flush();
-        assert_eq!(counter.get() as u64, 0);
+        assert_eq!(counter.get(), 0);
     }
 
     #[test]
@@ -502,48 +502,48 @@ mod tests {
         assert!(local_vec_1.remove_label_values(&["v1", "v2"]).is_err());
 
         local_vec_1.with_label_values(&["v1", "v2"]).inc_by(23.0);
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 23.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 23.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
 
         local_vec_1.flush();
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= f64::EPSILON);
 
         local_vec_1.flush();
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= f64::EPSILON);
 
         local_vec_1.with_label_values(&["v1", "v2"]).inc_by(11.0);
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 11.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 11.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 23.0) <= f64::EPSILON);
 
         local_vec_1.flush();
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 34.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 34.0) <= f64::EPSILON);
 
         // When calling `remove_label_values`, it is "flushed" immediately.
         assert!(local_vec_1.remove_label_values(&["v1", "v2"]).is_ok());
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
 
         local_vec_1.with_label_values(&["v1", "v2"]).inc();
         assert!(local_vec_1.remove_label_values(&["v1"]).is_err());
         assert!(local_vec_1.remove_label_values(&["v1", "v3"]).is_err());
 
         local_vec_1.with_label_values(&["v1", "v2"]).inc_by(13.0);
-        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 14.0) <= EPSILON);
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= EPSILON);
+        assert!((local_vec_1.with_label_values(&["v1", "v2"]).get() - 14.0) <= f64::EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 0.0) <= f64::EPSILON);
 
         local_vec_2.with_label_values(&["v1", "v2"]).inc_by(7.0);
-        assert!((local_vec_2.with_label_values(&["v1", "v2"]).get() - 7.0) <= EPSILON);
+        assert!((local_vec_2.with_label_values(&["v1", "v2"]).get() - 7.0) <= f64::EPSILON);
 
         local_vec_1.flush();
         local_vec_2.flush();
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 21.0) <= EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 21.0) <= f64::EPSILON);
 
         local_vec_1.flush();
         local_vec_2.flush();
-        assert!((vec.with_label_values(&["v1", "v2"]).get() - 21.0) <= EPSILON);
+        assert!((vec.with_label_values(&["v1", "v2"]).get() - 21.0) <= f64::EPSILON);
     }
 
     #[test]

src/desc.rs

@@ -253,8 +253,7 @@ mod tests {
                 vec![name.into()],
                 HashMap::new(),
             )
-            .err()
-            .expect(format!("expected error for {}", name).as_ref());
+            .expect_err(format!("expected error for {}", name).as_ref());
             match res {
                 Error::Msg(msg) => assert_eq!(msg, format!("'{}' is not a valid label name", name)),
                 other => panic!("{}", other),
@@ -268,8 +267,7 @@ mod tests {
             let mut labels = HashMap::new();
             labels.insert(name.into(), "value".into());
             let res = Desc::new("name".into(), "help".into(), vec![], labels)
-                .err()
-                .expect(format!("expected error for {}", name).as_ref());
+                .expect_err(format!("expected error for {}", name).as_ref());
             match res {
                 Error::Msg(msg) => assert_eq!(msg, format!("'{}' is not a valid label name", name)),
                 other => panic!("{}", other),
@@ -281,8 +279,7 @@ mod tests {
     fn test_invalid_metric_name() {
         for &name in &["-dash", "9gag", "has space"] {
             let res = Desc::new(name.into(), "help".into(), vec![], HashMap::new())
-                .err()
-                .expect(format!("expected error for {}", name).as_ref());
+                .expect_err(format!("expected error for {}", name).as_ref());
             match res {
                 Error::Msg(msg) => {
                     assert_eq!(msg, format!("'{}' is not a valid metric name", name))

src/gauge.rs

@@ -188,7 +188,7 @@ mod tests {
         assert_eq!(mfs.len(), 1);
 
         let mf = mfs.pop().unwrap();
-        let m = mf.get_metric().get(0).unwrap();
+        let m = mf.get_metric().first().unwrap();
         assert_eq!(m.get_label().len(), 2);
         assert_eq!(m.get_gauge().get_value() as u64, 42);
     }

src/histogram.rs

@@ -284,11 +284,11 @@ impl ShardAndCount {
 /// A histogram supports two main execution paths:
 ///
 /// 1. `observe` which increases the overall observation counter, updates the
-/// observation sum and increases a single bucket counter.
+///    observation sum and increases a single bucket counter.
 ///
 /// 2. `proto` (aka. collecting the metric, from now on referred to as the
-/// collect operation) which snapshots the state of the histogram and exposes it
-/// as a Protobuf struct.
+///    collect operation) which snapshots the state of the histogram and exposes
+///    it as a Protobuf struct.
 ///
 /// If an observe and a collect operation interleave, the latter could be
 /// exposing a snapshot of the histogram that does not uphold all histogram
@@ -1207,7 +1207,7 @@ impl Clone for LocalHistogramVec {
 
 #[cfg(test)]
 mod tests {
-    use std::f64::{EPSILON, INFINITY};
+    use std::f64;
     use std::thread;
     use std::time::Duration;
 
@@ -1237,7 +1237,7 @@ mod tests {
         assert_eq!(mfs.len(), 1);
 
         let mf = mfs.pop().unwrap();
-        let m = mf.get_metric().get(0).unwrap();
+        let m = mf.get_metric().first().unwrap();
         assert_eq!(m.get_label().len(), 2);
         let proto_histogram = m.get_histogram();
         assert_eq!(proto_histogram.get_sample_count(), 3);
@@ -1251,11 +1251,11 @@ mod tests {
         assert_eq!(mfs.len(), 1);
 
         let mf = mfs.pop().unwrap();
-        let m = mf.get_metric().get(0).unwrap();
+        let m = mf.get_metric().first().unwrap();
         assert_eq!(m.get_label().len(), 0);
         let proto_histogram = m.get_histogram();
         assert_eq!(proto_histogram.get_sample_count(), 0);
-        assert!((proto_histogram.get_sample_sum() - 0.0) < EPSILON);
+        assert!((proto_histogram.get_sample_sum() - 0.0) < f64::EPSILON);
         assert_eq!(proto_histogram.get_bucket().len(), buckets.len())
     }
 
@@ -1287,7 +1287,7 @@ mod tests {
         let m = mf.get_metric().get(0).unwrap();
         let proto_histogram = m.get_histogram();
         assert_eq!(proto_histogram.get_sample_count(), 3);
-        assert!((proto_histogram.get_sample_sum() - 0.0) > EPSILON);
+        assert!((proto_histogram.get_sample_sum() - 0.0) > f64::EPSILON);
     }
 
     #[test]
@@ -1311,7 +1311,11 @@ mod tests {
             (vec![], true, DEFAULT_BUCKETS.len()),
             (vec![-2.0, -1.0, -0.5, 0.0, 0.5, 1.0, 2.0], true, 7),
             (vec![-2.0, -1.0, -0.5, 10.0, 0.5, 1.0, 2.0], false, 7),
-            (vec![-2.0, -1.0, -0.5, 0.0, 0.5, 1.0, INFINITY], true, 6),
+            (
+                vec![-2.0, -1.0, -0.5, 0.0, 0.5, 1.0, f64::INFINITY],
+                true,
+                6,
+            ),
         ];
 
         for (buckets, is_ok, length) in table {
@@ -1366,7 +1370,7 @@ mod tests {
         for (millis, seconds) in tbls {
             let d = Duration::from_millis(millis);
             let v = duration_to_seconds(d);
-            assert!((v - seconds).abs() < EPSILON);
+            assert!((v - seconds).abs() < f64::EPSILON);
         }
     }
 
@@ -1405,7 +1409,7 @@ mod tests {
 
         let proto_histogram = m.get_histogram();
         assert_eq!(proto_histogram.get_sample_count(), 1);
-        assert!((proto_histogram.get_sample_sum() - 1.0) < EPSILON);
+        assert!((proto_histogram.get_sample_sum() - 1.0) < f64::EPSILON);
         assert_eq!(proto_histogram.get_bucket().len(), buckets.len())
     }
 
@@ -1421,7 +1425,7 @@ mod tests {
             let m = histogram.metric();
             let proto_histogram = m.get_histogram();
             assert_eq!(proto_histogram.get_sample_count(), count);
-            assert!((proto_histogram.get_sample_sum() - sum) < EPSILON);
+            assert!((proto_histogram.get_sample_sum() - sum) < f64::EPSILON);
         };
 
         local.observe(1.0);
@@ -1456,7 +1460,7 @@ mod tests {
             let ms = vec.collect()[0].take_metric();
             let proto_histogram = ms[0].get_histogram();
             assert_eq!(proto_histogram.get_sample_count(), count);
-            assert!((proto_histogram.get_sample_sum() - sum) < EPSILON);
+            assert!((proto_histogram.get_sample_sum() - sum) < f64::EPSILON);
         };
 
         {

src/macros.rs

@@ -43,7 +43,7 @@ fn test_labels_without_trailing_comma() {
         "foo" => "bar"
     };
     assert_eq!(labels.len(), 2);
-    assert!(labels.get("test").is_some());
+    assert!(labels.contains_key("test"));
     assert_eq!(*(labels.get("test").unwrap()), "hello");
 }
 
@@ -84,6 +84,7 @@ macro_rules! opts {
             let opts = $crate::Opts::new($NAME, $HELP);
             let lbs = HashMap::<String, String>::new();
             $(
+                #[allow(clippy::redundant_locals)]
                 let mut lbs = lbs;
                 lbs.extend($CONST_LABELS.iter().map(|(k, v)| ((*k).into(), (*v).into())));
             )*
@@ -104,7 +105,7 @@ fn test_opts_trailing_comma() {
 
     let opts = opts!(name, help, labels! {"test" => "hello", "foo" => "bar",},);
     assert_eq!(opts.const_labels.len(), 2);
-    assert!(opts.const_labels.get("foo").is_some());
+    assert!(opts.const_labels.contains_key("foo"));
     assert_eq!(opts.const_labels.get("foo").unwrap(), "bar");
 
     let opts = opts!(
@@ -114,7 +115,7 @@ fn test_opts_trailing_comma() {
         labels! {"ans" => "42",},
     );
     assert_eq!(opts.const_labels.len(), 3);
-    assert!(opts.const_labels.get("ans").is_some());
+    assert!(opts.const_labels.contains_key("ans"));
     assert_eq!(opts.const_labels.get("ans").unwrap(), "42");
 }
 
@@ -191,7 +192,7 @@ fn test_histogram_opts_trailing_comma() {
     assert_eq!(opts.common_opts.name, name);
     assert_eq!(opts.common_opts.help, help);
     assert_eq!(opts.buckets.len(), 2);
-    assert!(opts.common_opts.const_labels.get("key").is_some());
+    assert!(opts.common_opts.const_labels.contains_key("key"));
     assert_eq!(opts.common_opts.const_labels.get("key").unwrap(), "value");
 }