From 190b04fcbcadf4807c5c2bb0ef9e528bbff62e32 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Mon, 21 Oct 2019 16:34:25 -0400
Subject: add NewTxPoolHeadEvent

---
 core/tx_pool.go | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'core/tx_pool.go')

diff --git a/core/tx_pool.go b/core/tx_pool.go
index caabd5c..3454936 100644
--- a/core/tx_pool.go
+++ b/core/tx_pool.go
@@ -213,6 +213,7 @@ type TxPool struct {
 	chain       blockChain
 	gasPrice    *big.Int
 	txFeed      event.Feed
+	headFeed    event.Feed
 	scope       event.SubscriptionScope
 	signer      types.Signer
 	mu          sync.RWMutex
@@ -328,6 +329,7 @@ func (pool *TxPool) loop() {
 			if ev.Block != nil {
 				pool.requestReset(head.Header(), ev.Block.Header())
 				head = ev.Block
+				pool.headFeed.Send(NewTxPoolHeadEvent{head})
 			}
 
 		// System shutdown.
@@ -398,6 +400,12 @@ func (pool *TxPool) SubscribeNewTxsEvent(ch chan<- NewTxsEvent) event.Subscripti
 	return pool.scope.Track(pool.txFeed.Subscribe(ch))
 }
 
+// SubscribeNewHeadEvent registers a subscription of NewHeadEvent and
+// starts sending event to the given channel.
+func (pool *TxPool) SubscribeNewHeadEvent(ch chan<- NewTxPoolHeadEvent) event.Subscription {
+	return pool.scope.Track(pool.headFeed.Subscribe(ch))
+}
+
 // GasPrice returns the current gas price enforced by the transaction pool.
 func (pool *TxPool) GasPrice() *big.Int {
 	pool.mu.RLock()
-- 
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