Show first seen date of mempool transaction in explorer

api/worker.go

@@ -294,6 +294,10 @@ func (w *Worker) GetTransactionFromBchainTx(bchainTx *bchain.Tx, height uint32,
 			return nil, err
 		}
 	}
+	// for mempool transaction get first seen time
+	if bchainTx.Confirmations == 0 {
+		bchainTx.Blocktime = int64(w.mempool.GetTransactionTime(bchainTx.Txid))
+	}
 	r := &Tx{
 		Blockhash:        blockhash,
 		Blockheight:      int(height),

api/xpub.go

@@ -383,13 +383,13 @@ func (w *Worker) GetXpubAddress(xpub string, page int, txsOnPage int, option Acc
 		return nil, err
 	}
 	// setup filtering of txids
-	var useTxids func(txid *xpubTxid, ad *xpubAddress) bool
+	var txidFilter func(txid *xpubTxid, ad *xpubAddress) bool
 	if !(filter.FromHeight == 0 && filter.ToHeight == 0 && filter.Vout == AddressFilterVoutOff) {
 		toHeight := maxUint32
 		if filter.ToHeight != 0 {
 			toHeight = filter.ToHeight
 		}
-		useTxids = func(txid *xpubTxid, ad *xpubAddress) bool {
+		txidFilter = func(txid *xpubTxid, ad *xpubAddress) bool {
 			if txid.height < filter.FromHeight || txid.height > toHeight {
 				return false
 			}
@@ -406,6 +406,7 @@ func (w *Worker) GetXpubAddress(xpub string, page int, txsOnPage int, option Acc
 	// process mempool, only if ToHeight is not specified
 	if filter.ToHeight == 0 && !filter.OnlyConfirmed {
 		txmMap = make(map[string]*Tx)
+		mempoolEntries := make(bchain.MempoolTxidEntries, 0)
 		for _, da := range [][]xpubAddress{data.addresses, data.changeAddresses} {
 			for i := range da {
 				ad := &da[i]
@@ -432,18 +433,23 @@ func (w *Worker) GetXpubAddress(xpub string, page int, txsOnPage int, option Acc
 						}
 						uBalSat.Add(&uBalSat, tx.getAddrVoutValue(ad.addrDesc))
 						uBalSat.Sub(&uBalSat, tx.getAddrVinValue(ad.addrDesc))
-						if page == 0 && !foundTx && (useTxids == nil || useTxids(&txid, ad)) {
-							if option == AccountDetailsTxidHistory {
-								txids = append(txids, tx.Txid)
-							} else if option >= AccountDetailsTxHistoryLight {
-								txs = append(txs, tx)
-							}
+						// mempool txs are returned only on the first page, uniquely and filtered
+						if page == 0 && !foundTx && (txidFilter == nil || txidFilter(&txid, ad)) {
+							mempoolEntries = append(mempoolEntries, bchain.MempoolTxidEntry{Txid: txid.txid, Time: uint32(tx.Blocktime)})
 						}
 					}
-
 				}
 			}
 		}
+		// sort the entries by time descending
+		sort.Sort(mempoolEntries)
+		for _, entry := range mempoolEntries {
+			if option == AccountDetailsTxidHistory {
+				txids = append(txids, entry.Txid)
+			} else if option >= AccountDetailsTxHistoryLight {
+				txs = append(txs, txmMap[entry.Txid])
+			}
+		}
 	}
 	if option >= AccountDetailsTxidHistory {
 		txcMap := make(map[string]bool)
@@ -459,7 +465,7 @@ func (w *Worker) GetXpubAddress(xpub string, page int, txsOnPage int, option Acc
 					}
 					// add tx only once
 					if !added {
-						add := useTxids == nil || useTxids(&txid, ad)
+						add := txidFilter == nil || txidFilter(&txid, ad)
 						txcMap[txid.txid] = add
 						if add {
 							txc = append(txc, txid)

bchain/coins/blockchain.go

@@ -316,3 +316,7 @@ func (c *mempoolWithMetrics) GetAllEntries() (v bchain.MempoolTxidEntries) {
 	defer func(s time.Time) { c.observeRPCLatency("GetAllEntries", s, nil) }(time.Now())
 	return c.mempool.GetAllEntries()
 }
+
+func (c *mempoolWithMetrics) GetTransactionTime(txid string) uint32 {
+	return c.mempool.GetTransactionTime(txid)
+}

bchain/types.go

@@ -291,4 +291,5 @@ type Mempool interface {
 	GetTransactions(address string) ([]Outpoint, error)
 	GetAddrDescTransactions(addrDesc AddressDescriptor) ([]Outpoint, error)
 	GetAllEntries() MempoolTxidEntries
+	GetTransactionTime(txid string) uint32
 }

static/templates/txdetail.html

@@ -4,9 +4,7 @@
         <div class="col-xs-7 col-md-8 ellipsis">
             <a href="/tx/{{$tx.Txid}}">{{$tx.Txid}}</a>
         </div>
-        {{- if $tx.Confirmations -}}
-        <div class="col-xs-5 col-md-4 text-muted text-right">mined {{formatUnixTime $tx.Blocktime}}</div>
-        {{- end -}}
+        <div class="col-xs-5 col-md-4 text-muted text-right">{{if $tx.Confirmations}}mined{{else}}first seen{{end}} {{formatUnixTime $tx.Blocktime}}</div>
     </div>
     <div class="row line-mid">
         <div class="col-md-5">

static/templates/txdetail_ethereumtype.html

@@ -5,9 +5,7 @@
             <a href="/tx/{{$tx.Txid}}">{{$tx.Txid}}</a>
             {{if eq $tx.EthereumSpecific.Status 1}}<span class="text-success"> ✔</span>{{end}}{{if eq $tx.EthereumSpecific.Status 0}}<span class="text-danger"> ✘</span>{{end}}
         </div>
-        {{- if $tx.Confirmations -}}
-        <div class="col-xs-5 col-md-4 text-muted text-right">mined {{formatUnixTime $tx.Blocktime}}</div>
-        {{- end -}}
+        <div class="col-xs-5 col-md-4 text-muted text-right">{{if $tx.Confirmations}}mined{{else}}first seen{{end}} {{formatUnixTime $tx.Blocktime}}</div>
     </div>
     <div class="row line-mid">
         <div class="col-md-4">