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https://github.com/blackglory/store

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https://github.com/blackglory/store

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# Store
提供以WebSocket为通讯协议的键值对数据库, 受到[CouchDB]启发.

[CouchDB]: https://couchdb.apache.org]

## Quickstart
```sh
docker run \
--detach \
--publish 8080:8080 \
blackglory/store
```

## Install
### 从源代码运行
```sh
git clone https://github.com/BlackGlory/store
cd store
yarn install
yarn build
yarn bundle
yarn --silent start
```

### 从源代码构建
```sh
git clone https://github.com/BlackGlory/store
cd store
yarn install
yarn docker:build
```

### Recipes
#### docker-compose.yml
```yaml
version: '3.8'

services:
store:
image: 'blackglory/store'
restart: always
volumes:
- 'store-data:/data'
ports:
- '8080:8080'

volumes:
store-data:
```

## API
```ts
interface INamespaceStats {
items: number
}

interface IItem {
value: JSONValue
revision: string
}

interface IAPI {
getAllNamespaces(): string[]
getAllItemIds(namespace: string): string[]

getNamespaceStats(namespace: string): INamespaceStats

clearItemsByNamespace(namespace: string): null

hasItem(namespace: string, itemId: string): boolean
getItem(namespace: string, itemId: string): IItem | null

/**
* @param revision
* 可选参数, 用于实现乐观并发策略.
* `null`表示目标项目不存在.
*
* @throws {IncorrectRevision}
* 在提供revision参数的情况下, 如果目标项目的revision值不等于参数, 或项目不存在, 则抛出此错误.
*
* @returns 如果成功, 返回新的revision.
*/
setItem(
namespace: string
, itemId: string
, value: JSONValue
, revision?: string | null
): string

/**
* @param revision 可选参数, 用于实现乐观并发策略.
* @throws {IncorrectRevision}
* 在提供revision参数的情况下, 如果目标项目的revision值不等于参数, 或项目不存在, 则抛出此错误.
*/
removeItem(namespace: string, itemId: string, revision?: string): null
}

class IncorrectRevision extends CustomError {}
```

## 环境变量
### `STORE_HOST`, `STORE_PORT`
通过环境变量`STORE_HOST`和`STORE_PORT`决定服务器监听的地址和端口,
默认值为`localhost`和`8080`.

### `STORE_WS_HEARTBEAT_INTERVAL`
通过环境变量`STORE_WS_HEARTBEAT_INTERVAL`可以设置WS心跳包(ping帧)的发送间隔, 单位为毫秒.
在默认情况下, 服务不会发送心跳包,
半开连接的检测依赖于服务端和客户端的运行平台的TCP Keepalive配置.

当`STORE_WS_HEARTBEAT_INTERVAL`大于零时,
服务会通过WS的ping帧按间隔发送心跳包.

## 客户端
- JavaScript/TypeScript(Node.js, Browser):