net: Add PrivateBroadcast::GetBroadcastInfo

diff --git a/src/private_broadcast.cpp b/src/private_broadcast.cpp
index fd36a940..3900f10a 100644
--- a/src/private_broadcast.cpp
+++ b/src/private_broadcast.cpp
@@ -104,6 +104,25 @@ std::vector<CTransactionRef> PrivateBroadcast::GetStale() const
     return stale;
 }
 
+std::vector<PrivateBroadcast::TxBroadcastInfo> PrivateBroadcast::GetBroadcastInfo() const
+    EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
+{
+    LOCK(m_mutex);
+    std::vector<TxBroadcastInfo> entries;
+    entries.reserve(m_transactions.size());
+
+    for (const auto& [tx, sent_to] : m_transactions) {
+        std::vector<PeerSendInfo> peers;
+        peers.reserve(sent_to.size());
+        for (const auto& status : sent_to) {
+            peers.emplace_back(PeerSendInfo{.address = status.address, .sent = status.picked, .received = status.confirmed});
+        }
+        entries.emplace_back(TxBroadcastInfo{.tx = tx, .peers = std::move(peers)});
+    }
+
+    return entries;
+}
+
 PrivateBroadcast::Priority PrivateBroadcast::DerivePriority(const std::vector<SendStatus>& sent_to)
 {
     Priority p;
diff --git a/src/private_broadcast.h b/src/private_broadcast.h
index 3beed5ee..28634424 100644
--- a/src/private_broadcast.h
+++ b/src/private_broadcast.h
@@ -30,6 +30,17 @@
 class PrivateBroadcast
 {
 public:
+    struct PeerSendInfo {
+        CService address;
+        NodeClock::time_point sent;
+        std::optional<NodeClock::time_point> received;
+    };
+
+    struct TxBroadcastInfo {
+        CTransactionRef tx;
+        std::vector<PeerSendInfo> peers;
+    };
+
     /**
      * Add a transaction to the storage.
      * @param[in] tx The transaction to add.
@@ -97,6 +108,12 @@ public:
     std::vector<CTransactionRef> GetStale() const
         EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
 
+    /**
+     * Get stats about all transactions currently being privately broadcast.
+     */
+    std::vector<TxBroadcastInfo> GetBroadcastInfo() const
+        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
+
 private:
     /// Status of a transaction sent to a given node.
     struct SendStatus {
diff --git a/src/test/private_broadcast_tests.cpp b/src/test/private_broadcast_tests.cpp
index e0ab64cd..73bdbbb5 100644
--- a/src/test/private_broadcast_tests.cpp
+++ b/src/test/private_broadcast_tests.cpp
@@ -7,6 +7,7 @@
 #include <test/util/setup_common.h>
 #include <util/time.h>
 
+#include <algorithm>
 #include <boost/test/unit_test.hpp>
 
 BOOST_FIXTURE_TEST_SUITE(private_broadcast_tests, BasicTestingSetup)
@@ -29,12 +30,15 @@ BOOST_AUTO_TEST_CASE(basic)
 
     PrivateBroadcast pb;
     const NodeId recipient1{1};
-    const CService addr1{};
+    in_addr ipv4Addr;
+    ipv4Addr.s_addr = 0xa0b0c001;
+    const CService addr1{ipv4Addr, 1111};
 
     // No transactions initially.
     BOOST_CHECK(!pb.PickTxForSend(/*will_send_to_nodeid=*/recipient1, /*will_send_to_address=*/addr1).has_value());
     BOOST_CHECK_EQUAL(pb.GetStale().size(), 0);
     BOOST_CHECK(!pb.HavePendingTransactions());
+    BOOST_CHECK_EQUAL(pb.GetBroadcastInfo().size(), 0);
 
     // Make a transaction and add it.
     const auto tx1{MakeDummyTx(/*id=*/1, /*num_witness=*/0)};
@@ -48,17 +52,32 @@ BOOST_AUTO_TEST_CASE(basic)
     BOOST_REQUIRE(tx1->GetWitnessHash() != tx2->GetWitnessHash());
 
     BOOST_CHECK(pb.Add(tx2));
+    const auto find_tx_info{[](auto& infos, const CTransactionRef& tx) -> const PrivateBroadcast::TxBroadcastInfo& {
+        const auto it{std::ranges::find(infos, tx->GetWitnessHash(), [](const auto& info) { return info.tx->GetWitnessHash(); })};
+        BOOST_REQUIRE(it != infos.end());
+        return *it;
+    }};
+    const auto check_peer_counts{[&](size_t tx1_peer_count, size_t tx2_peer_count) {
+        const auto infos{pb.GetBroadcastInfo()};
+        BOOST_CHECK_EQUAL(infos.size(), 2);
+        BOOST_CHECK_EQUAL(find_tx_info(infos, tx1).peers.size(), tx1_peer_count);
+        BOOST_CHECK_EQUAL(find_tx_info(infos, tx2).peers.size(), tx2_peer_count);
+    }};
+
+    check_peer_counts(/*tx1_peer_count=*/0, /*tx2_peer_count=*/0);
 
     const auto tx_for_recipient1{pb.PickTxForSend(/*will_send_to_nodeid=*/recipient1, /*will_send_to_address=*/addr1).value()};
     BOOST_CHECK(tx_for_recipient1 == tx1 || tx_for_recipient1 == tx2);
 
     // A second pick must return the other transaction.
     const NodeId recipient2{2};
-    const CService addr2{};
+    const CService addr2{ipv4Addr, 2222};
     const auto tx_for_recipient2{pb.PickTxForSend(/*will_send_to_nodeid=*/recipient2, /*will_send_to_address=*/addr2).value()};
     BOOST_CHECK(tx_for_recipient2 == tx1 || tx_for_recipient2 == tx2);
     BOOST_CHECK_NE(tx_for_recipient1, tx_for_recipient2);
 
+    check_peer_counts(/*tx1_peer_count=*/1, /*tx2_peer_count=*/1);
+
     const NodeId nonexistent_recipient{0};
 
     // Confirm transactions <-> recipients mapping is correct.
@@ -80,6 +99,21 @@ BOOST_AUTO_TEST_CASE(basic)
     BOOST_CHECK(pb.DidNodeConfirmReception(recipient1));
     BOOST_CHECK(!pb.DidNodeConfirmReception(recipient2));
 
+    const auto infos{pb.GetBroadcastInfo()};
+    BOOST_CHECK_EQUAL(infos.size(), 2);
+    {
+        const auto& [tx, peers]{find_tx_info(infos, tx_for_recipient1)};
+        BOOST_CHECK_EQUAL(peers.size(), 1);
+        BOOST_CHECK_EQUAL(peers[0].address.ToStringAddrPort(), addr1.ToStringAddrPort());
+        BOOST_CHECK(peers[0].received.has_value());
+    }
+    {
+        const auto& [tx, peers]{find_tx_info(infos, tx_for_recipient2)};
+        BOOST_CHECK_EQUAL(peers.size(), 1);
+        BOOST_CHECK_EQUAL(peers[0].address.ToStringAddrPort(), addr2.ToStringAddrPort());
+        BOOST_CHECK(!peers[0].received.has_value());
+    }
+
     BOOST_CHECK_EQUAL(pb.GetStale().size(), 1);
     BOOST_CHECK_EQUAL(pb.GetStale()[0], tx_for_recipient2);
 
@@ -92,7 +126,9 @@ BOOST_AUTO_TEST_CASE(basic)
     BOOST_CHECK_EQUAL(pb.Remove(tx_for_recipient2).value(), 0);
     BOOST_CHECK(!pb.Remove(tx_for_recipient2).has_value());
 
-    BOOST_CHECK(!pb.PickTxForSend(/*will_send_to_nodeid=*/nonexistent_recipient, /*will_send_to_address=*/CService{}).has_value());
+    BOOST_CHECK_EQUAL(pb.GetBroadcastInfo().size(), 0);
+    const CService addr_nonexistent{ipv4Addr, 3333};
+    BOOST_CHECK(!pb.PickTxForSend(/*will_send_to_nodeid=*/nonexistent_recipient, /*will_send_to_address=*/addr_nonexistent).has_value());
 }
 
 BOOST_AUTO_TEST_SUITE_END()