mixpanel-ohos

// 1. 强类型事件定义
enum EventType {
    case ViewPage(String)
    case ClickButton(String, Map<String, PropertyValue>)
    case Purchase(Double, String, Map<String, PropertyValue>)
    // 利用代数数据类型强制规范事件结构
}

// 属性值类型约束
enum PropertyValue {
    case StringVal(String)
    case IntVal(Int64)
    case DoubleVal(Double)
    case BoolVal(Bool)
    case ListVal(List<PropertyValue>)
}

// 2. 零拷贝事件构建器
class EventBuilder {
    private var name: String
    private var props: MutableMap<String, PropertyValue>
    private var buffer: ByteBuffer // 预分配缓冲区
    
    init(name: String) {
        self.name = name
        self.props = MutableMap()
        self.buffer = ByteBuffer.allocate(1024)
    }
    
    func addProperty(key: String, value: PropertyValue): EventBuilder {
        this.props.put(key, value)
        return this
    }
    
    // 直接序列化到字节流，无中间字符串
    func serializeTo(buffer: inout ByteBuffer): Unit {
        buffer.writeString(this.name)
        buffer.writeMap(this.props) // 自定义高效写入逻辑
    }
}

// 3. 核心 SDK 类
class MixpanelSDK {
    private var eventQueue: Channel<List<UInt8>> // 字节流通道
    private var storage: PersistentStorage
    private var networkClient: HttpClient
    
    init(token: String, config: MixpanelConfig) {
        this.eventQueue = Channel(capacity: 10000)
        this.storage = PersistentStorage(path: config.cachePath)
        this.networkClient = HttpClient(baseURL: "https://api.mixpanel.com")
        
        // 启动后台协程处理上报
        task {
            await this.flushLoop()
        }
    }
    
    // 采集事件 (非阻塞)
    func track(eventType: EventType): Unit {
        let builder = EventBuilder(eventType.name())
        // 填充属性...
        
        let buffer = ByteBuffer.allocate(512)
        builder.serializeTo(&buffer)
        
        // 尝试送入队列，若满则丢弃或降级
        if (!this.eventQueue.trySend(buffer.toList())) {
            // 触发背压策略：写入本地磁盘
            this.storage.append(buffer.toList())
        }
    }
    
    // 后台刷新循环
    private async func flushLoop(): Unit {
        let batchBuffer = MutableList<List<UInt8>>()
        let timer = Timer(interval: 5000.ms) // 5秒或攒够一定数量
        
        while (true) {
            select {
                case event <- this.eventQueue.recv() => {
                    batchBuffer.add(event)
                    if (batchBuffer.size() >= 100) {
                        await this.sendBatch(batchBuffer)
                        batchBuffer.clear()
                    }
                }
                case <- timer.tick => {
                    if (!batchBuffer.isEmpty()) {
                        await this.sendBatch(batchBuffer)
                        batchBuffer.clear()
                    }
                    // 从磁盘读取积压数据
                    await this.flushDiskToNetwork()
                }
            }
        }
    }
    
    private async func sendBatch(events: List<List<UInt8>>): Unit {
        // 合并、压缩、发送
        let compressed = LZ4.compress(this.mergeEvents(events))
        try? await this.networkClient.post("/track", body: compressed)
    }
}

// 4. 业务场景示例：电商购买事件
class ECommerceTracker {
    private var mixpanel: MixpanelSDK
    
    init(mixpanel: MixpanelSDK) { self.mixpanel = mixpanel }
    
    func onPurchase(orderId: String, amount: Double, items: List<String>) {
        // 编译期确保事件结构正确
        let event = EventType.Purchase(
            amount, 
            orderId, 
            ["item_count": PropertyValue.IntVal(items.size().toInt64())]
        )
        
        // 零开销采集
        this.mixpanel.track(event)
    }
}

# PR 自动化流水线
cjpm fmt --check
cjpm build --release
cjpm lint --deny-warnings
cjpm test --coverage --min-coverage 90
cjpm bench --threshold 5% # 确保性能不回退
# 内存泄漏检测
cjpm run leak-test --scenario high-load