Added benchmarks + optimizations

As one redditor stated, I'm claiming that my program is fast without benchmarks. Here's said benchmark ;). The benchmarks use Criterion and just see how many magnet url's it can make per second. On the sluggish laptop I'm using at the moment, I get around 50K/s.

Removed redundant if statement in lib.rs for the tr field, increasing performance by 40%.

Made it so that the xl field uses a customized match statement for its output, basically making it so it converts from a str to an int, further increasing performance by 11%.

Cargo.toml

@@ -14,3 +14,20 @@ edition = "2018"
 [dependencies]
 lazy_static = "1"
 regex = "1"
+
+[dev-dependencies]
+criterion = {version="0.3", features=["html_reports"]}
+
+[[bench]]
+name = "benchmark"
+harness = false
+
+[profile.bench]
+opt-level = 3
+lto = "fat"
+codegen-units = 1
+
+[profile.release]
+opt-level = 3
+lto = "fat"
+codegen-units = 1

benches/benchmark.rs

@@ -0,0 +1,21 @@
+use criterion::{criterion_group, criterion_main, Criterion, BenchmarkId, Throughput, black_box};
+
+extern crate magnet_url;
+use magnet_url::Magnet;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let magnet = black_box("magnet:?xt=urn:btih:08ada5a7a6183aae1e09d831df6748d566095a10&dn=Sintel&tr=udp%3A%2F%2Fexplodie.org%3A6969&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.empire-js.us%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=wss%3A%2F%2Ftracker.btorrent.xyz&tr=wss%3A%2F%2Ftracker.fastcast.nz&tr=wss%3A%2F%2Ftracker.openwebtorrent.com&ws=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2F&xs=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2Fsintel.torrent");
+    let mut group = c.benchmark_group("sintel");
+
+    group.throughput(Throughput::Elements(1));
+
+    group.bench_with_input(BenchmarkId::new("sintel", magnet), &magnet, |b, &s| {
+        b.iter(|| Magnet::new(s));
+    });
+
+    group.finish();
+
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

src/lib.rs

@@ -97,6 +97,7 @@ const MANIFEST_TOPIC_RE_STR: &str = r"mt=((\w+)[A-Za-z0-9!@#$%^:*<>,?/()_+=.{}\\
 /// use magnet_url::Magnet;
 /// let _magnet_link = Magnet::new("https://example.com");
 /// ```
+
 pub struct Magnet {
     ///Display Name of the torrent
     pub dn: String,
@@ -169,16 +170,22 @@ impl Magnet {
             dn: validate_regex(&DISPLAY_NAME_RE, 1),
             hash_type: validate_regex(&EXACT_TOPIC_RE, 1),
             xt: validate_regex(&EXACT_TOPIC_RE, 2),
-            xl: validate_regex(&EXACT_LENGTH_RE, 1).parse().unwrap_or(-1),
+            // Using a slightly modified match statement so it doesn't parse from str to String to int
+            xl: {
+                match &EXACT_LENGTH_RE.captures(magnet_str) {
+                    Some(m) => m.get(1).map_or("-1", |m| m.as_str()).parse().unwrap_or(-1),
+                    None => -1,
+                }
+
+            },
             xs: validate_regex(&EXACT_SOURCE_RE, 1),
             tr: {
                 let mut tr_vec: Vec<String> = Vec::new();
                 // Since tr is a vector, I can't just use the validate_regex function
-                if ADDRESS_TRACKER_RE.is_match(magnet_str) {
                 for tr in ADDRESS_TRACKER_RE.captures_iter(magnet_str) {
                     tr_vec.push(tr.get(1).map_or("", |m| m.as_str()).to_string());
                 }
-                }
+
                 tr_vec
 
             },