114 lines
4.4 KiB
Markdown
114 lines
4.4 KiB
Markdown
## `ip2region xdb rust` 查询客户端实现
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## Features
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- 支持`ip`字符串和`u32`/`u28` 数字两种类型的查询
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- 支持 IPv4 和 IPv6
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- 支持无缓存，Vector 索引缓存，全部数据缓存三种模式
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## 缓存策略对比与说明
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| 缓存模式 | IPv4 数据内存占用 | IPv6 数据内存占用 | IPv4 benchmark 查询耗时 | IPv6 benchmark 查询耗时 |
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| ------------ | ----------- | ----------- | ------------------- |---------------------|
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| 无缓存 | 1-2MB | 1-2MB | 54 us | 122us |
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| vector index | 1-2MB | 1-2MB | 27 us | 100us |
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| 全部缓存 | 20 MB | 200 MB | 120 ns | 178 ns |
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- 在 `ip2region::Searcher` 初始化的时候会产生一次 IO, 读取 `xdb` 的 header 信息以初始化 `Searcher`，header 信息主要包含了 `xdb` 的 IP 版本，该操作对后续 IP 的查询不产生性能，耗时影响，多占用约 20 Byte 的内存
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- 在无缓存模式与 `vector index` 缓存模式下，所有 `xdb` 的 IO 读取都是按需（按照 bytes offset, bytes length）读取少量信息, 都是线程安全的，可以 benchmark 测试验证
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- 在全部缓存模式下，`xdb` 文件会一次读取，加载到内存中，测试 `IPv6 xdb` 文件大约占用内存 200MB 左右，查询不频繁的话，占用内存会逐渐降低
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- 所有缓存模式下，包括初始化 `ip2region::Searcher` 过程当中，程序都是线程安全的，不存在某个全局可修改的中间变量，`ip2region::Searcher` 初始化完成以后，调用函数`search`都是使用不可变引用，同时 `ip2region::Searcher` 也可以通过 `Arc` 方式传递给不同线程使用
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## 使用方式
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使用`cargo`新建一个项目，比如`cargo new ip-test`
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配置`Cargo.toml`的`[dependencies]`如下
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```toml
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[dependencies]
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ip2region = { git = "https://github.com/lionsoul2014/ip2region.git", branch = "master" }
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```
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### 基本使用示例
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编写`main.rs`
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```rust
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use ip2region::{CachePolicy, Searcher};
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fn main() {
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for cache_policy in [
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CachePolicy::NoCache,
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CachePolicy::FullMemory,
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CachePolicy::VectorIndex,
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] {
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let ipv4_seacher = Searcher::new("../ip2region/data/ip2region_v4.xdb".to_owned(), cache_policy).unwrap();
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for ip in [1_u32, 2, 3] {
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let result = ipv4_seacher.search(ip).unwrap();
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println!("CachePolicy: {cache_policy:?}, IP: {ip}, Result: {result}");
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}
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for ip in ["1.1.1.1", "2.2.2.2"] {
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let result = ipv4_seacher.search(ip).unwrap();
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println!("CachePolicy: {cache_policy:?}, IP: {ip}, Result: {result}");
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}
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let ipv6_seacher = Searcher::new("../ip2region/data/ip2region_v6.xdb".to_owned(), cache_policy).unwrap();
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for ip in ["2001::", "2001:4:112::"] {
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let result = ipv6_seacher.search(ip).unwrap();
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println!("CachePolicy: {cache_policy:?}, IP: {ip}, Result: {result}");
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}
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for ip in [1_u128, 2, 3<<125] {
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let result = ipv6_seacher.search(ip).unwrap();
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println!("CachePolicy: {cache_policy:?}, IP: {ip}, Result: {result}");
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}
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}
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}
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```
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## Benchmark 测试
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```bash
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$ git lfs pull
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$ cd binding/rust/ip2region
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$ cargo test
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$ cargo bench
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// --snip---
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ipv4_no_memory_bench time: [54.699 µs 57.401 µs 61.062 µs]
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Found 16 outliers among 100 measurements (16.00%)
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10 (10.00%) high mild
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6 (6.00%) high severe
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ipv4_vector_index_cache_bench
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time: [25.972 µs 26.151 µs 26.360 µs]
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Found 9 outliers among 100 measurements (9.00%)
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1 (1.00%) low severe
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6 (6.00%) high mild
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2 (2.00%) high severe
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ipv4_full_memory_cache_bench
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time: [132.04 ns 139.48 ns 149.20 ns]
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Found 10 outliers among 100 measurements (10.00%)
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4 (4.00%) high mild
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6 (6.00%) high severe
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ipv6_no_memory_bench time: [121.00 µs 122.14 µs 123.40 µs]
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Found 5 outliers among 100 measurements (5.00%)
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2 (2.00%) high mild
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3 (3.00%) high severe
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ipv6_vector_index_cache_bench
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time: [96.830 µs 100.23 µs 104.81 µs]
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Found 8 outliers among 100 measurements (8.00%)
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2 (2.00%) high mild
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6 (6.00%) high severe
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ipv6_full_memory_cache_bench
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time: [175.29 ns 178.82 ns 183.77 ns]
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Found 6 outliers among 100 measurements (6.00%)
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2 (2.00%) high mild
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4 (4.00%) high severe
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// --snip--
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```
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