长安链源码分析之交易过程分析（7）

type txPoolImpl struct {	//交易池是否启动的状态标志	stat    int32  // Identification of module service startup	//节点id	nodeId  string // The ID of node	//链id	chainId string // The ID of chain
	//存放交易的队列	queue    *txQueue         // the queue for store transactions	//存放交易的缓存	cache    *txCache         // the cache to temporarily cache transactions		//接收交易的通道	addTxsCh chan *mempoolTxs // channel that receive the common transactions	//交易池上下文	ctx      context.Context	cancel   context.CancelFunc
	//刷新间隔时间，默认2s	flushTicker int        // ticker to check whether the cache needs to be refreshed	//恢复模块？	recover     *txRecover // transaction recover to cache packed txs, and sync txs for node	//存储dumped 交易	wal         *lws.Lws   // the wal is used to store dumped transaction		//验证交易	ac         protocol.AccessControlProvider // Access control provider to verify transaction signature and authority	//消息总线	msgBus     msgbus.MessageBus              // Information interaction between modules	//链配置	chainConf  protocol.ChainConf             // ChainConfig contains chain config	//交易过滤器	txFilter   protocol.TxFilter              // TxFilter is cuckoo filter	//存储模块	blockStore protocol.BlockchainStore       // Store module implementation	//日志模块	log        protocol.Logger                // Log	//元数据信息	metricTxExistInDBTime  *prometheus.HistogramVec // TxExistInDB verify time prometheus metric	metricTxVerifySignTime *prometheus.HistogramVec // TxVerifySign verify time prometheus metric}