Examples of org.ethereum.trie.TrieImpl$ScanAction

org.ethereum.trie.TrieImpl
The modified Merkle Patricia tree (trie) provides a persistent data structure to map between arbitrary-length binary data (byte arrays). It is defined in terms of a mutable data structure to map between 256-bit binary fragments and arbitrary-length binary data, typically implemented as a database. The core of the trie, and its sole requirement in terms of the protocol specification is to provide a single value that identifies a given set of key-value pairs, which may either a 32 byte sequence or the empty byte sequence. It is left as an implementation consideration to store and maintain the structure of the trie in a manner the allows effective and efficient realisation of the protocol. The trie implements a caching mechanism and will use cached values if they are present. If a node is not present in the cache it will try to fetch it from the database and store the cached value. Note: the data isn't persisted unless `sync` is explicitly called. www.ethereumJ.com @author : Nick Savers Created on: 20/05/2014 10:44

            db.put(key, val);
        }


        // TEST: load trie out of this run up to block#33
        byte[] rootNode = Hex.decode("bb690805d24882bc7ccae6fc0f80ac146274d5b81c6a6e9c882cd9b0a649c9c7");
        TrieImpl trie = new TrieImpl(db.getDb(), rootNode);


        // first key added in genesis
        byte[] val1 = trie.get(Hex.decode("51ba59315b3a95761d0863b05ccc7a7f54703d99"));
        AccountState accountState1 = new AccountState(val1);


        assertEquals(BigInteger.valueOf(2).pow(200), accountState1.getBalance());
        assertEquals("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470", Hex.toHexString(accountState1.getCodeHash()));
        assertEquals(BigInteger.ZERO, accountState1.getNonce());
        assertEquals(null, accountState1.getStateRoot());


        // last key added up to block#33
        byte[] val2 = trie.get(Hex.decode("a39c2067eb45bc878818946d0f05a836b3da44fa"));
        AccountState accountState2 = new AccountState(val2);


        assertEquals(new BigInteger("1500000000000000000"), accountState2.getBalance());
        assertEquals("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470", Hex.toHexString(accountState2.getCodeHash()));
        assertEquals(BigInteger.ZERO, accountState2.getNonce());

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    @Test // update the trie with blog key/val
          // each time dump the entire trie
    public void testSample_1(){


        TrieImpl trie = new TrieImpl(mockDb);


        trie.update("dog", "puppy");
        String dmp = trie.getTrieDump();
        System.out.println(dmp);
        System.out.println();
        Assert.assertEquals("ed6e08740e4a267eca9d4740f71f573e9aabbcc739b16a2fa6c1baed5ec21278", Hex.toHexString(trie.getRootHash()));


        trie.update("do", "verb");
        dmp = trie.getTrieDump();
        System.out.println(dmp);
        System.out.println();
        Assert.assertEquals("779db3986dd4f38416bfde49750ef7b13c6ecb3e2221620bcad9267e94604d36", Hex.toHexString(trie.getRootHash()));


        trie.update("doggiestan", "aeswome_place");
        dmp = trie.getTrieDump();
        System.out.println(dmp);
        System.out.println();
        Assert.assertEquals("8bd5544747b4c44d1274aa99a6293065fe319b3230e800203317e4c75a770099", Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteLongString3() {
        String ROOT_HASH_BEFORE = "e020de34ca26f8d373ff2c0a8ac3a4cb9032bfa7a194c68330b7ac3584a1d388";
        String ROOT_HASH_AFTER = "63356ecf33b083e244122fca7a9b128cc7620d438d5d62e4f8b5168f1fb0527b";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(cat)));


        trie.update(ca, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(ca)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(ca);
        assertEquals("", new String(trie.get(ca)));
        assertEquals(ROOT_HASH_AFTER, Hex.toHexString(trie.getRootHash()));
    }

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    @Test
    public void testDeleteMultipleItems1() {
        String ROOT_HASH_BEFORE = "3a784eddf1936515f0313b073f99e3bd65c38689021d24855f62a9601ea41717";
        String ROOT_HASH_AFTER1 = "60a2e75cfa153c4af2783bd6cb48fd6bed84c6381bc2c8f02792c046b46c0653";
        String ROOT_HASH_AFTER2 = "a84739b4762ddf15e3acc4e6957e5ab2bbfaaef00fe9d436a7369c6f058ec90d";
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, dog);
        assertEquals(dog, new String(trie.get(cat)));


        trie.update(ca, dude);
        assertEquals(dude, new String(trie.get(ca)));


        trie.update(doge, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(doge)));


        trie.update(dog, test);
        assertEquals(test, new String(trie.get(dog)));


        trie.update(test, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(test)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(dog);
        assertEquals("", new String(trie.get(dog)));
        assertEquals(ROOT_HASH_AFTER1, Hex.toHexString(trie.getRootHash()));


        trie.delete(test);
        assertEquals("", new String(trie.get(test)));
        assertEquals(ROOT_HASH_AFTER2, Hex.toHexString(trie.getRootHash()));
    }

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    public void testDeleteMultipleItems2() {
        String ROOT_HASH_BEFORE = "cf1ed2b6c4b6558f70ef0ecf76bfbee96af785cb5d5e7bfc37f9804ad8d0fb56";
        String ROOT_HASH_AFTER1 = "f586af4a476ba853fca8cea1fbde27cd17d537d18f64269fe09b02aa7fe55a9e";
        String ROOT_HASH_AFTER2 = "c59fdc16a80b11cc2f7a8b107bb0c954c0d8059e49c760ec3660eea64053ac91";


        TrieImpl trie = new TrieImpl(mockDb);
        trie.update(c, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(c)));


        trie.update(ca, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(ca)));


        trie.update(cat, LONG_STRING);
        assertEquals(LONG_STRING, new String(trie.get(cat)));
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(ca);
        assertEquals("", new String(trie.get(ca)));
        assertEquals(ROOT_HASH_AFTER1, Hex.toHexString(trie.getRootHash()));


        trie.delete(cat);
        assertEquals("", new String(trie.get(cat)));
        assertEquals(ROOT_HASH_AFTER2, Hex.toHexString(trie.getRootHash()));
    }

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    }


    @Test
    public void testDeleteAll() {
        String ROOT_HASH_BEFORE = "a84739b4762ddf15e3acc4e6957e5ab2bbfaaef00fe9d436a7369c6f058ec90d";
        TrieImpl trie = new TrieImpl(mockDb);
        assertEquals(ROOT_HASH_EMPTY, Hex.toHexString(trie.getRootHash()));


        trie.update(ca, dude);
        trie.update(cat, dog);
        trie.update(doge, LONG_STRING);
        assertEquals(ROOT_HASH_BEFORE, Hex.toHexString(trie.getRootHash()));


        trie.delete(ca);
        trie.delete(cat);
        trie.delete(doge);
        assertEquals(ROOT_HASH_EMPTY, Hex.toHexString(trie.getRootHash()));
    }

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        assertEquals(ROOT_HASH_EMPTY, Hex.toHexString(trie.getRootHash()));
    }


    @Test
    public void testTrieEquals() {
        TrieImpl trie1 = new TrieImpl(mockDb);
        TrieImpl trie2 = new TrieImpl(mockDb);


        trie1.update(doge, LONG_STRING);
        trie2.update(doge, LONG_STRING);
        assertTrue("Expected tries to be equal", trie1.equals(trie2));
        assertEquals(Hex.toHexString(trie1.getRootHash()), Hex.toHexString(trie2.getRootHash()));


        trie1.update(dog, LONG_STRING);
        trie2.update(cat, LONG_STRING);
        assertFalse("Expected tries not to be equal", trie1.equals(trie2));
        assertNotEquals(Hex.toHexString(trie1.getRootHash()), Hex.toHexString(trie2.getRootHash()));
    }

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        assertNotEquals(Hex.toHexString(trie1.getRootHash()), Hex.toHexString(trie2.getRootHash()));
    }


    @Test
    public void testTrieSync() {
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(dog, LONG_STRING);
        assertEquals("Expected no data in database", mockDb.getAddedItems(), 0);


        trie.sync();
        assertNotEquals("Expected data to be persisted", mockDb.getAddedItems(), 0);
    }

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        assertNotEquals("Expected data to be persisted", mockDb.getAddedItems(), 0);
    }


    @Test
    public void TestTrieDirtyTracking() {
        TrieImpl trie = new TrieImpl(mockDb);
        trie.update(dog, LONG_STRING);
        assertTrue("Expected trie to be dirty", trie.getCache().isDirty());


        trie.sync();
        assertFalse("Expected trie not to be dirty", trie.getCache().isDirty());


        trie.update(test, LONG_STRING);
        trie.getCache().undo();
        assertFalse("Expected trie not to be dirty", trie.getCache().isDirty());
    }

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        assertFalse("Expected trie not to be dirty", trie.getCache().isDirty());
    }


    @Test
    public void TestTrieReset() {
        TrieImpl trie = new TrieImpl(mockDb);


        trie.update(cat, LONG_STRING);
        assertNotEquals("Expected cached nodes", 0, trie.getCache().getNodes().size());


        trie.getCache().undo();


        assertEquals("Expected no nodes after undo", 0, trie.getCache().getNodes().size());
    }

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