bench: add coverage for addrman select with network parameter

to evaluate the worst case performance with the network parameter passed
through, fill the new table with addresses then add a singular I2P address to
retrieve

Co-authored-by: Martin Zumsande <mzumsande@gmail.com>

src/bench/addrman.cpp

@@ -4,6 +4,7 @@
 
 #include <addrman.h>
 #include <bench/bench.h>
+#include <netbase.h>
 #include <netgroup.h>
 #include <random.h>
 #include <util/check.h>
@@ -71,6 +72,13 @@ static void FillAddrMan(AddrMan& addrman)
     AddAddressesToAddrMan(addrman);
 }
 
+static CNetAddr ResolveIP(const std::string& ip)
+{
+    CNetAddr addr;
+    LookupHost(ip, addr, false);
+    return addr;
+}
+
 /* Benchmarks */
 
 static void AddrManAdd(benchmark::Bench& bench)
@@ -95,6 +103,25 @@ static void AddrManSelect(benchmark::Bench& bench)
     });
 }
 
+static void AddrManSelectByNetwork(benchmark::Bench& bench)
+{
+    AddrMan addrman{EMPTY_NETGROUPMAN, /*deterministic=*/false, ADDRMAN_CONSISTENCY_CHECK_RATIO};
+
+    // add single I2P address to new table
+    CService i2p_service;
+    i2p_service.SetSpecial("udhdrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v4jna.b32.i2p");
+    CAddress i2p_address(i2p_service, NODE_NONE);
+    i2p_address.nTime = Now<NodeSeconds>();
+    CNetAddr source = ResolveIP("252.2.2.2");
+    addrman.Add({i2p_address}, source);
+
+    FillAddrMan(addrman);
+
+    bench.run([&] {
+        (void)addrman.Select(/*new_only=*/false, NET_I2P);
+    });
+}
+
 static void AddrManGetAddr(benchmark::Bench& bench)
 {
     AddrMan addrman{EMPTY_NETGROUPMAN, /*deterministic=*/false, ADDRMAN_CONSISTENCY_CHECK_RATIO};
@@ -135,5 +162,6 @@ static void AddrManAddThenGood(benchmark::Bench& bench)
 
 BENCHMARK(AddrManAdd, benchmark::PriorityLevel::HIGH);
 BENCHMARK(AddrManSelect, benchmark::PriorityLevel::HIGH);
+BENCHMARK(AddrManSelectByNetwork, benchmark::PriorityLevel::HIGH);
 BENCHMARK(AddrManGetAddr, benchmark::PriorityLevel::HIGH);
 BENCHMARK(AddrManAddThenGood, benchmark::PriorityLevel::HIGH);