Creates unittests for addrman, makes addrman testable.

Adds several unittests for addrman to verify it works as expected.
Makes small modifications to addrman to allow deterministic and targeted tests.

src/Makefile.test.include

@@ -36,6 +36,7 @@ GENERATED_TEST_FILES = $(JSON_TEST_FILES:.json=.json.h) $(RAW_TEST_FILES:.raw=.r
 BITCOIN_TESTS =\
   test/arith_uint256_tests.cpp \
   test/bignum.h \
+  test/addrman_tests.cpp \
   test/alert_tests.cpp \
   test/allocator_tests.cpp \
   test/base32_tests.cpp \

src/addrman.cpp

@@ -329,13 +329,17 @@ void CAddrMan::Attempt_(const CService& addr, int64_t nTime)
     info.nAttempts++;
 }
 
-CAddrInfo CAddrMan::Select_()
+CAddrInfo CAddrMan::Select_(bool newOnly)
 {
     if (size() == 0)
         return CAddrInfo();
 
+    if (newOnly && nNew == 0)
+        return CAddrInfo();
+
     // Use a 50% chance for choosing between tried and new table entries.
-    if (nTried > 0 && (nNew == 0 || GetRandInt(2) == 0)) {
+    if (!newOnly &&
+       (nTried > 0 && (nNew == 0 || GetRandInt(2) == 0))) { 
         // use a tried node
         double fChanceFactor = 1.0;
         while (1) {

src/addrman.h

@@ -22,6 +22,8 @@
  */
 class CAddrInfo : public CAddress
 {
+
+
 public:
     //! last try whatsoever by us (memory only)
     int64_t nLastTry;
@@ -230,8 +232,8 @@ protected:
     //! Mark an entry as attempted to connect.
     void Attempt_(const CService &addr, int64_t nTime);
 
-    //! Select an address to connect to.
-    CAddrInfo Select_();
+    //! Select an address to connect to, if newOnly is set to true, only the new table is selected from.
+    CAddrInfo Select_(bool newOnly);
 
 #ifdef DEBUG_ADDRMAN
     //! Perform consistency check. Returns an error code or zero.
@@ -532,13 +534,13 @@ public:
     /**
      * Choose an address to connect to.
      */
-    CAddrInfo Select()
+    CAddrInfo Select(bool newOnly = false)
     {
         CAddrInfo addrRet;
         {
             LOCK(cs);
             Check();
-            addrRet = Select_();
+            addrRet = Select_(newOnly);
             Check();
         }
         return addrRet;
@@ -567,6 +569,12 @@ public:
             Check();
         }
     }
+    
+    //! Ensure that bucket placement is always the same for testing purposes.
+    void MakeDeterministic(){
+        nKey.SetNull(); //Do not use outside of tests.
+    }
+
 };
 
 #endif // BITCOIN_ADDRMAN_H

src/test/addrman_tests.cpp

@@ -0,0 +1,180 @@
+// Copyright (c) 2012-2013 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#include "addrman.h"
+#include "test/test_bitcoin.h"
+#include <string>
+#include <boost/test/unit_test.hpp>
+
+#include "random.h"
+
+using namespace std;
+
+class CAddrManTest : public CAddrMan{};
+
+BOOST_FIXTURE_TEST_SUITE(addrman_tests, BasicTestingSetup)
+
+BOOST_AUTO_TEST_CASE(addrman_simple)
+{
+    CAddrManTest addrman;
+
+    // Set addrman addr placement to be deterministic.
+    addrman.MakeDeterministic();
+
+    CNetAddr source = CNetAddr("252.2.2.2:8333");
+
+    // Test 1: Does Addrman respond correctly when empty.
+    BOOST_CHECK(addrman.size() == 0);
+    CAddrInfo addr_null = addrman.Select();
+    BOOST_CHECK(addr_null.ToString() == "[::]:0");
+
+    // Test 2: Does Addrman::Add work as expected.
+    CService addr1 = CService("250.1.1.1:8333");
+    addrman.Add(CAddress(addr1), source);
+    BOOST_CHECK(addrman.size() == 1);
+    CAddrInfo addr_ret1 = addrman.Select();
+    BOOST_CHECK(addr_ret1.ToString() == "250.1.1.1:8333");
+
+    // Test 3: Does IP address deduplication work correctly. 
+    //  Expected dup IP should not be added.
+    CService addr1_dup = CService("250.1.1.1:8333");
+    addrman.Add(CAddress(addr1_dup), source);
+    BOOST_CHECK(addrman.size() == 1);
+
+
+    // Test 5: New table has one addr and we add a diff addr we should
+    //  have two addrs.
+    CService addr2 = CService("250.1.1.2:8333");
+    addrman.Add(CAddress(addr2), source);
+    BOOST_CHECK(addrman.size() == 2);
+
+    // Test 6: AddrMan::Clear() should empty the new table. 
+    addrman.Clear();
+    BOOST_CHECK(addrman.size() == 0);
+    CAddrInfo addr_null2 = addrman.Select();
+    BOOST_CHECK(addr_null2.ToString() == "[::]:0");
+}
+
+BOOST_AUTO_TEST_CASE(addrman_ports)
+{
+    CAddrManTest addrman;
+
+    // Set addrman addr placement to be deterministic.
+    addrman.MakeDeterministic();
+
+    CNetAddr source = CNetAddr("252.2.2.2:8333");
+
+    BOOST_CHECK(addrman.size() == 0);
+
+    // Test 7; Addr with same IP but diff port does not replace existing addr.
+    CService addr1 = CService("250.1.1.1:8333");
+    addrman.Add(CAddress(addr1), source);
+    BOOST_CHECK(addrman.size() == 1);
+
+    CService addr1_port = CService("250.1.1.1:8334");
+    addrman.Add(CAddress(addr1_port), source);
+    BOOST_CHECK(addrman.size() == 1);
+    CAddrInfo addr_ret2 = addrman.Select();
+    BOOST_CHECK(addr_ret2.ToString() == "250.1.1.1:8333");
+
+    // Test 8: Add same IP but diff port to tried table, it doesn't get added.
+    //  Perhaps this is not ideal behavior but it is the current behavior.
+    addrman.Good(CAddress(addr1_port));
+    BOOST_CHECK(addrman.size() == 1);
+    bool newOnly = true;
+    CAddrInfo addr_ret3 = addrman.Select(newOnly);
+    BOOST_CHECK(addr_ret3.ToString() == "250.1.1.1:8333");
+}
+
+
+BOOST_AUTO_TEST_CASE(addrman_select)
+{
+    CAddrManTest addrman;
+
+    // Set addrman addr placement to be deterministic.
+    addrman.MakeDeterministic();
+
+    CNetAddr source = CNetAddr("252.2.2.2:8333");
+
+    // Test 9: Select from new with 1 addr in new.
+    CService addr1 = CService("250.1.1.1:8333");
+    addrman.Add(CAddress(addr1), source);
+    BOOST_CHECK(addrman.size() == 1);
+
+    bool newOnly = true;
+    CAddrInfo addr_ret1 = addrman.Select(newOnly);
+    BOOST_CHECK(addr_ret1.ToString() == "250.1.1.1:8333");
+
+
+    // Test 10: move addr to tried, select from new expected nothing returned.
+    addrman.Good(CAddress(addr1));
+    BOOST_CHECK(addrman.size() == 1);
+    CAddrInfo addr_ret2 = addrman.Select(newOnly);
+    BOOST_CHECK(addr_ret2.ToString() == "[::]:0");
+
+    CAddrInfo addr_ret3 = addrman.Select();
+    BOOST_CHECK(addr_ret3.ToString() == "250.1.1.1:8333");
+}
+
+BOOST_AUTO_TEST_CASE(addrman_new_collisions)
+{
+    CAddrManTest addrman;
+
+    // Set addrman addr placement to be deterministic.
+    addrman.MakeDeterministic();
+
+    CNetAddr source = CNetAddr("252.2.2.2:8333");
+
+    BOOST_CHECK(addrman.size() == 0);
+
+    for (unsigned int i = 1; i < 4; i++){
+        CService addr = CService("250.1.1."+boost::to_string(i));
+        addrman.Add(CAddress(addr), source);
+
+        //Test 11: No collision in new table yet.
+        BOOST_CHECK(addrman.size() == i);
+    }
+
+    //Test 12: new table collision!
+    CService addr1 = CService("250.1.1.4");
+    addrman.Add(CAddress(addr1), source);
+    BOOST_CHECK(addrman.size() == 3);
+
+    CService addr2 = CService("250.1.1.5");
+    addrman.Add(CAddress(addr2), source);
+    BOOST_CHECK(addrman.size() == 4);
+}
+
+BOOST_AUTO_TEST_CASE(addrman_tried_collisions)
+{
+    CAddrManTest addrman;
+
+    // Set addrman addr placement to be deterministic.
+    addrman.MakeDeterministic();
+
+    CNetAddr source = CNetAddr("252.2.2.2:8333");
+
+    BOOST_CHECK(addrman.size() == 0);
+
+    for (unsigned int i = 1; i < 75; i++){
+        CService addr = CService("250.1.1."+boost::to_string(i));
+        addrman.Add(CAddress(addr), source);
+        addrman.Good(CAddress(addr));
+
+        //Test 13: No collision in tried table yet.
+        BOOST_TEST_MESSAGE(addrman.size());
+        BOOST_CHECK(addrman.size() == i);
+    }
+
+    //Test 14: tried table collision!
+    CService addr1 = CService("250.1.1.76");
+    addrman.Add(CAddress(addr1), source);
+    BOOST_CHECK(addrman.size() == 74);
+
+    CService addr2 = CService("250.1.1.77");
+    addrman.Add(CAddress(addr2), source);
+    BOOST_CHECK(addrman.size() == 75);
+}
+
+
+BOOST_AUTO_TEST_SUITE_END()