[2324] LeaseMgr tests improved.

src/lib/dhcp/lease_mgr.cc

@@ -39,6 +39,10 @@ Lease6::Lease6(LeaseType type, const isc::asiolink::IOAddress& addr, DuidPtr dui
      preferred_lft_(preferred), valid_lft_(valid), t1_(t1), t2_(t2),
      subnet_id_(subnet_id), fixed_(false), fqdn_fwd_(false),
      fqdn_rev_(false) {
+    if (duid == DuidPtr()) {
+        isc_throw(InvalidOperation, "DUID must be specified for a lease");
+    }
+
     cltt_ = time(NULL);
 }
 

src/lib/dhcp/lease_mgr.h

@@ -272,6 +272,12 @@ typedef std::vector< boost::shared_ptr<Lease6Ptr> > Lease6Collection;
 /// interface to all backends. As this is an abstract class, it should not
 /// be used directly, but rather specialized derived class should be used
 /// instead.
+///
+/// This class is a meta-singleton. At any given time, there is only one
+/// instance of any classes derived from that class. That is achieved with
+/// defining only a single protected constructor, so every derived class has
+/// to use it. Furthermore, this sole constructor registers the first instance
+/// (and throws InvalidOperation if there is an attempt to create a second one).
 class LeaseMgr : public boost::noncopyable {
 public:
     /// Client Hardware address
@@ -286,8 +292,6 @@ public:
     /// @throw InvalidOperation if LeaseMgr not instantiated
     static LeaseMgr& instance();
 
-    void instantiate(const std::string& config);
-
     /// @brief Destructor
     virtual ~LeaseMgr();
 
@@ -471,11 +475,15 @@ public:
 protected:
     /// @brief The sole lease manager constructor
     ///
-    /// dbconfig is a generic way of passing parameters. Parameters
-    /// are passed in the "name=value" format, separated by spaces.
-    /// Values may be enclosed in double quotes, if needed.
+    /// dbconfig is a generic way of passing parameters. Parameters are passed
+    /// in the "name=value" format, separated by spaces. Values may be enclosed
+    /// in double quotes, if needed. This ctor guarantees that there will be
+    /// only one instance of any derived classes. If there is a second instance
+    /// being created with the first one still around, it will throw
+    /// InvalidOperation.
     ///
     /// @param dbconfig database configuration
+    /// @throw InvalidOperation when trying to create second LeaseMgr
     LeaseMgr(const std::string& dbconfig);
 
     /// @brief returns value of the parameter

src/lib/dhcp/tests/lease_mgr_unittest.cc

@@ -385,4 +385,59 @@ TEST_F(LeaseMgrTest, addGetDelete) {
     delete leaseMgr;
 }
 
+// This test checks there that leaseMgr is really a singleton and that
+// no more than one can be created.
+TEST_F(LeaseMgrTest, singleton) {
+    Memfile_LeaseMgr* leaseMgr1 = NULL;
+    Memfile_LeaseMgr* leaseMgr2 = NULL;
+
+    EXPECT_THROW(LeaseMgr::instance(), InvalidOperation);
+
+    EXPECT_NO_THROW( leaseMgr1 = new Memfile_LeaseMgr("") );
+
+    EXPECT_NO_THROW(LeaseMgr::instance());
+
+    // There can be only one instance of any LeaseMgr derived
+    // objects instantiated at any time.
+    ASSERT_THROW(leaseMgr2 = new Memfile_LeaseMgr(""), InvalidOperation);
+
+    delete leaseMgr1;
+
+    ASSERT_NO_THROW(leaseMgr2 = new Memfile_LeaseMgr("") );
+
+    delete leaseMgr2;
+}
+
+// This test checks if the Lease6 structure can be instantiated correctly
+TEST(Lease6, ctor) {
+
+    IOAddress addr("2001:db8:1::456");
+
+    uint8_t llt[] = {0, 1, 2, 3, 4, 5, 6, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
+    DuidPtr duid(new DUID(llt, sizeof(llt)));
+
+    uint32_t iaid = 7; // just a number
+
+    SubnetID subnet_id = 8; // just another number
+
+    Lease6Ptr x(new Lease6(Lease6::LEASE_IA_NA, addr,
+                           duid, iaid, 100, 200, 50, 80,
+                           subnet_id));
+
+    EXPECT_TRUE(x->addr_ == addr);
+    EXPECT_TRUE(*x->duid_ == *duid);
+    EXPECT_TRUE(x->iaid_ == iaid);
+    EXPECT_TRUE(x->subnet_id_ == subnet_id);
+    EXPECT_TRUE(x->type_ == Lease6::LEASE_IA_NA);
+    EXPECT_TRUE(x->preferred_lft_ == 100);
+    EXPECT_TRUE(x->valid_lft_ == 200);
+    EXPECT_TRUE(x->t1_ == 50);
+    EXPECT_TRUE(x->t2_ == 80);
+
+    // Lease6 must be instantiated with a DUID, not with NULL pointer
+    EXPECT_THROW(new Lease6(Lease6::LEASE_IA_NA, addr,
+                            DuidPtr(), iaid, 100, 200, 50, 80,
+                            subnet_id), InvalidOperation);
+}
+
 }; // end of anonymous namespace