# ip2region nodejs 查询客户端实现

## 使用方式

### 完全基于文件的查询

```javascript
// 导入包
const Searcher = require('.')
// 指定ip2region数据文件路径
const dbPath = 'ip2region.xdb file path'

try {
  // 创建searcher对象
  const searcher = Searcher.newWithFileOnly(dbPath)
  // 查询
  const data = await searcher.search('218.4.167.70')
  // data: {region: '中国|0|江苏省|苏州市|电信', ioCount: 3, took: 1.342389}
} catch(e) {
  console.log(e)
}

```

### 缓存 `VectorIndex` 索引

```javascript
// 导入包
const Searcher = require('.')
// 指定ip2region数据文件路径
const dbPath = 'ip2region.xdb file path'

try {
  // 同步读取vectorIndex
  const vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
  // 创建searcher对象
  const searcher = Searcher.newWithVectorIndex(dbPath, vectorIndex)
  // 查询 await 或 promise均可
  const data = await searcher.search('218.4.167.70')
  // data: {region: '中国|0|江苏省|苏州市|电信', ioCount: 2, took: 0.402874}
} catch(e) {
  console.log(e)
}
```

### 缓存整个 `xdb` 数据

```javascript
// 导入包
const Searcher = require('.')
// 指定ip2region数据文件路径
const dbPath = 'ip2region.xdb file path'

try {
  // 同步读取buffer
  const buffer = Searcher.loadContentFromFile(dbPath)
  // 创建searcher对象
  const searcher = Searcher.newWithBuffer(buffer)
  // 同步查询
  let data = searcher.searchWithBuffer('218.4.167.70')
  // data: {region:'中国|0|江苏省|苏州市|电信', took: 0.063833}
  // 异步查询，await 或 promise 均可
  data = await searcher.search('218.4.167.70')
  // data: {region:'中国|0|江苏省|苏州市|电信', took: 0.063833}
} catch(e) {
  console.log(e)
}
```

## 查询测试

可以通过 `node ./tests/test.app.js` 命令来测试查询：

```shell
➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/test.app.js --help
usage: Usage node test.app.js <agrs>

ip2region test app

optional arguments:
  -h, --help            show this help message and exit
  -d DB, --db DB        ip2region binary xdb file path, default: ../../data/ip2region.xdb
  -c CACHE_POLICY, --cache-policy CACHE_POLICY
                        cache policy: file/vectorIndex/content, default: content
```

例如：使用默认的 data/ip2region.xdb 文件进行查询测试：

```shell
➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/test.app.js
parameters:
    dbPath: ../../data/ip2region.xdb
    cache-policy: content

type 'quit' to exit
ip2region>> 1.2.3.4
{ region: '美国|0|华盛顿|0|谷歌', ioCount: 0, took: 54.606261 }
ip2region>>
```

输入 ip 即可进行查询测试，也可以分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的查询效果。

## bench 测试

```shell
➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/bench.app.js --help
usage: Usage node test.app.js [command options]

ip2region benchmark app

optional arguments:
  -h, --help            show this help message and exit
  --db DB               ip2region binary xdb file path, default: ../../data/ip2region.xdb
  --src SRC             source ip text file path, default: ../../data/ip.merge.txt
  --cache-policy CACHE_POLICY
                        cache policy: file/vectorIndex/content, default: content

```

例如：通过默认的 data/ip2region.xdb 和 data/ip.merge.txt 文件进行 bench 测试：

```shell
➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/bench.app.js
options: 
    dbPath: ../../data/ip2region.xdb
    src: ../../data/ip2region.xdb
    cache-policy: content

Bench finished, {cachePolicy: content, total: 3417955, took: 20.591887765s, cost: 6.02462225658325μs/op}
```

可以通过分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的效果。  
>Note: 注意 bench 使用的 src 文件要是生成对应 xdb 文件相同的源文件。

## 单元测试及覆盖率结果

```shell
➜  nodejs git:(v2.0-for-nodejs) ✗ npm run coverage

...

  ip2region
    ✔ #newWithFileOnly and search
    ✔ #newWithVectorIndex and search
    ✔ #newWithBuffer and search


  3 passing (6ms)

----------|---------|----------|---------|---------|----------------------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                
----------|---------|----------|---------|---------|----------------------------------
All files |   91.58 |    60.71 |     100 |   91.58 |                                  
 index.js |   91.58 |    60.71 |     100 |   91.58 | 61,75,90,146,152,187,193,207,215 
----------|---------|----------|---------|---------|----------------------------------
```

Made with ♥ by Wu Jian Ping