test(bench): added benchmark

benches/format_parser.rs

@@ -0,0 +1,28 @@
+#[macro_use]
+extern crate criterion;
+extern crate nginx_log_parser;
+
+use criterion::Criterion;
+use nginx_log_parser::Format;
+use std::str::FromStr;
+
+fn format_parser_bench(c: &mut Criterion) {
+    c.bench_function("short format", |b| {
+        b.iter(|| {
+            Format::from_str(r#"$remote_addr [$time_local] "$request" $status"#)
+        })
+    });
+    c.bench_function("combined format", |b| {
+        b.iter(|| {
+            Format::from_str(r#"$remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent""#)
+        })
+    });
+    c.bench_function("long format", |b| {
+        b.iter(|| {
+            Format::from_str(r#"$remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"rt=$request_time uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time""#)
+        })
+    });
+}
+
+criterion_group!(benches, format_parser_bench);
+criterion_main!(benches);