perf(add more benchmark and change function calls):

binding/rust/bin/src/main.rs

@@ -8,10 +8,11 @@ fn main() {
     env::var("XDB_FILEPATH").unwrap_or_else(|_| {
         let matches = cmd::get_matches();
         let xdb_filepath = matches
-            .get_one::<String>("xdb")
-            .expect("you must use --xdb in command or set XDB_FILEPATH environment");
-        env::set_var("XDB_FILEPATH", xdb_filepath);
-        xdb_filepath.to_owned()
+            .get_one::<String>("xdb");
+        if xdb_filepath.is_some() {
+            env::set_var("XDB_FILEPATH", xdb_filepath.unwrap());
+        }
+        "".to_owned()
     });
 
     search::global_searcher();

binding/rust/search/benches/search.rs

-use criterion::{criterion_group, criterion_main, Criterion};
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
 use rand;
 
-use search::search_by_ip;
+use search::{buffer_value, get_block_by_size, get_start_end_ptr, global_searcher, search_by_ip};
 
-fn ip_search_benchmark(c: &mut Criterion) {
+fn ip_search_bench(c: &mut Criterion) {
     c.bench_function("ip_search_bench", |b| {
         b.iter(|| {
-            let ip = rand::random::<u32>();
-            search_by_ip(ip).unwrap();
+            search_by_ip(rand::random::<u32>()).unwrap();
         })
     });
 }
 
-criterion_group!(benches, ip_search_benchmark);
+fn buffer_value_bench(c: &mut Criterion) {
+    c.bench_function("buffer_value", |b| {
+        b.iter(|| {
+            let offset = rand::random::<u16>();
+            let length = rand::random::<u8>();
+            buffer_value(offset as usize, length as usize);
+        });
+    });
+}
+
+fn get_block_by_size_bench(c: &mut Criterion) {
+    c.bench_function("get_block_by_size", |b| {
+        b.iter(||{
+            get_block_by_size(&global_searcher().buffer, rand::random::<u16>() as usize, 4);
+        })
+    });
+}
+
+fn get_start_end_ptr_bench(c: &mut Criterion) {
+    c.bench_function("get_start_end_ptr", |b| {
+       b.iter(|| {
+           get_start_end_ptr(rand::random::<u32>());
+       })
+    });
+}
+
+criterion_group!(benches, ip_search_bench, buffer_value_bench, get_block_by_size_bench, get_start_end_ptr_bench);
 criterion_main!(benches);

binding/rust/search/src/lib.rs

-mod ip_value;
-
 use std::env;
 use std::error::Error;
 use std::fmt;
 use std::fmt::Formatter;
 use std::fs::File;
 use std::io::Read;
+use std::path::Path;
 
 use once_cell::sync::OnceCell;
 
 use ip_value::ToUIntIP;
 
-const HEADER_INFO_LENGTH: u32 = 256;
-// const VECTOR_INDEX_ROWS: u32 = 256;
-const VECTOR_INDEX_COLS: u32 = 256;
-const VECTOR_INDEX_SIZE: u32 = 8;
+mod ip_value;
+
+const HEADER_INFO_LENGTH: usize = 256;
+const VECTOR_INDEX_COLS: usize = 256;
+const VECTOR_INDEX_SIZE: usize = 8;
 const SEGMENT_INDEX_SIZE: usize = 14;
 
+/// store the xdb file in memory totally
 pub struct Searcher {
     pub buffer: Vec<u8>,
 }
 
+impl Searcher {
+    /// you can set the XDB_FILEPATH
+    /// or super dir has data dir with the file ip2region.xdb
+    /// it will check ../data/ip2region.xdb, ../../data/ip2region.xdb, ../../../data/ip2region.xdb
+    pub fn new() -> Result<Self, Box<dyn Error>> {
+        let xdb_filepath = env::var("XDB_FILEPATH")
+            .unwrap_or_else(|_| {
+                let prefix = "../".to_owned();
+                for recurse in 1..4 {
+                    let filepath = prefix.repeat(recurse) + "data/ip2region.xdb";
+                    if Path::new(filepath.as_str()).exists() {
+                        return filepath
+                    }
+                };
+                panic!("you must set XDB_FILEPATH or put file in ../data/ip2region.xdb")
+            });
+        println!("load xdb searcher file at {xdb_filepath}");
+        let mut f = File::open(xdb_filepath)?;
+        let mut buffer = Vec::new();
+        f.read_to_end(&mut buffer)?;
+        Ok(Self { buffer })
+    }
+}
+
+/// global init searcher thread safely
 pub fn global_searcher() -> &'static Searcher {
     static SEARCHER: OnceCell<Searcher> = OnceCell::new();
     SEARCHER.get_or_init(|| {
-        let xdp_filepath = env::var("XDB_FILEPATH").expect("you must set XDB_FILEPATH for search");
-        println!("init xdb searcher at {xdp_filepath}");
-        Searcher::new(xdp_filepath.as_str()).unwrap()
+        Searcher::new().unwrap()
     })
 }
 
@@ -36,91 +60,89 @@ impl fmt::Display for Searcher {
     }
 }
 
+pub fn get_start_end_ptr(ip: u32) -> (usize, usize) {
+    let il0= ((ip >> 24) & 0xFF) as usize;
+    let il1 = ((ip >> 16) & 0xFF) as usize;
+    let idx = VECTOR_INDEX_SIZE * (il0 * VECTOR_INDEX_COLS + il1);
+    let start_point = HEADER_INFO_LENGTH + idx;
+
+    let start_ptr = get_block_by_size(&global_searcher().buffer, start_point, 4);
+    let end_ptr = get_block_by_size(&global_searcher().buffer, start_point + 4, 4);
+    (start_ptr, end_ptr)
+}
+
+/// check https://mp.weixin.qq.com/s/ndjzu0BgaeBmDOCw5aqHUg for details
 pub fn search_by_ip<T>(ip: T) -> Result<String, Box<dyn Error>>
 where
     T: ToUIntIP,
 {
-    let changed_value = ip.to_u32_ip()?;
-    search_by_ip_u32(changed_value)
-}
-
-pub fn search_by_ip_u32(ip: u32) -> Result<String, Box<dyn Error>> {
-    let il0 = (ip >> 24) & 0xFF;
-    let il1 = (ip >> 16) & 0xFF;
-    let idx = VECTOR_INDEX_SIZE * (il0 * VECTOR_INDEX_COLS + il1);
-
-    let start_point = (HEADER_INFO_LENGTH + idx) as usize;
-    let buffer = &global_searcher().buffer;
-    let start_ptr = get_u32(buffer, start_point);
-    let end_ptr = get_u32(buffer, start_point + 4);
+    let ip = ip.to_u32_ip()?;
+    let (start_ptr, end_ptr) = get_start_end_ptr(ip);
     let mut left: usize = 0;
-    let mut right: usize = ((end_ptr - start_ptr) as usize) / SEGMENT_INDEX_SIZE;
+    let mut right: usize = (end_ptr - start_ptr) / SEGMENT_INDEX_SIZE;
+
     while left <= right {
         let mid = (left + right) >> 1;
-        let offset = (start_ptr as usize) + mid * SEGMENT_INDEX_SIZE;
+        let offset = &start_ptr + mid * SEGMENT_INDEX_SIZE;
         let buffer_ip_value = buffer_value(offset, SEGMENT_INDEX_SIZE);
-        let start_ip = get_u32(buffer_ip_value, 0);
-        if ip < start_ip {
+        let start_ip = get_block_by_size(&buffer_ip_value, 0, 4);
+        if &ip < &(start_ip as u32) {
             right = mid - 1;
-        } else if ip > get_u32(buffer_ip_value, 4) {
+        } else if &ip > &(get_block_by_size(&buffer_ip_value, 4, 4) as u32) {
             left = mid + 1;
         } else {
-            let length = (buffer_ip_value[8] as usize & 0x000000FF)
-                | (buffer_ip_value[9] as usize & 0x0000FF00);
-
-            let offset = get_u32(buffer_ip_value, 10);
-            let result = buffer_value(offset as usize, length)
-                .iter()
-                .map(|x| x.to_owned())
-                .collect::<Vec<u8>>();
-            return Ok(String::from_utf8(result)?);
+            let data_length = get_block_by_size(&buffer_ip_value, 8, 2);
+            let data_offset = get_block_by_size(&buffer_ip_value, 10, 4);
+            let result = String::from_utf8(
+                buffer_value(data_offset, data_length)
+                    .to_vec());
+            return Ok(result?);
         }
     }
     Err("not matched".into())
 }
 
+pub fn start_end_buffer_value(bytes: &[u8], offset: usize, length: usize) -> &[u8] {
+    &bytes[offset..offset+length]
+}
+
 pub fn buffer_value(offset: usize, length: usize) -> &'static [u8] {
     &global_searcher().buffer[offset..offset + length]
 }
 
-impl Searcher {
-    pub fn new(filepath: &str) -> Result<Self, Box<dyn Error>> {
-        let mut f = File::open(filepath)?;
-        let mut buffer = Vec::new();
-        f.read_to_end(&mut buffer)?;
-        Ok(Self { buffer })
+#[inline]
+pub fn get_block_by_size<T>(bytes: &[T], offset: usize, length: usize) -> usize
+where
+    T: Clone,
+    usize: From<T>,
+{
+    let mut result: usize = 0;
+    for (index, value) in bytes[offset..offset+length].iter().enumerate() {
+        result |= usize::from(value.clone()) << (index*8);
     }
-}
-
-fn get_u32(bytes: &[u8], offset: usize) -> u32 {
-    (bytes[offset] as u32) & 0x000000FF
-        | ((bytes[offset + 1] as u32) << 8) & 0x0000FF00
-        | ((bytes[offset + 2] as u32) << 16) & 0x00FF0000
-        | ((bytes[offset + 3] as u32) << 24) & 0xFF000000
+    result
 }
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use std::net::Ipv4Addr;
     use std::str::FromStr;
     use std::thread;
 
-    const TEST_IP_FILEPATH: &str = "../../../data/ip.test.txt";
+    use super::*;
 
     ///test all types find correct
     #[test]
-    fn test_search_by_ip() {
+    fn test_multi_type_ip() {
         search_by_ip("2.0.0.0").unwrap();
         search_by_ip("32").unwrap();
-        search_by_ip(32).unwrap();
+        search_by_ip(4294408949).unwrap();
         search_by_ip(Ipv4Addr::from_str("1.1.1.1").unwrap()).unwrap();
     }
 
-    /// test find ip correct use the file ip.test.txt in ../../data
     #[test]
-    fn test_random_choose_ip() {
-        let mut file = File::open(TEST_IP_FILEPATH).unwrap();
+    fn test_match_all_ip_correct() {
+        let mut file = File::open("../../../data/ip.test.txt").unwrap();
         let mut contents = String::new();
         file.read_to_string(&mut contents).unwrap();
         for line in contents.split("\n") {
@@ -138,7 +160,7 @@ mod tests {
     }
 
     #[test]
-    fn test_multi_thread() {
+    fn test_multi_thread_only_load_xdb_once() {
         let handle = thread::spawn(|| {
             let result = search_by_ip("2.2.2.2").unwrap();
             println!("ip search in spawn: {result}");