catch custom exception (#61)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/db/DefaultMutableBlockchain.java

@@ -29,6 +29,7 @@ import tech.pegasys.pantheon.ethereum.core.BlockHeader;
 import tech.pegasys.pantheon.ethereum.core.Hash;
 import tech.pegasys.pantheon.ethereum.core.Transaction;
 import tech.pegasys.pantheon.ethereum.core.TransactionReceipt;
+import tech.pegasys.pantheon.ethereum.util.InvalidConfigurationException;
 import tech.pegasys.pantheon.services.kvstore.KeyValueStorage;
 import tech.pegasys.pantheon.util.Subscribers;
 import tech.pegasys.pantheon.util.uint.UInt256;
@@ -352,8 +353,10 @@ public class DefaultMutableBlockchain implements MutableBlockchain {
         throw new IllegalStateException("Blockchain is missing genesis block data.");
       }
       if (!genesisHash.get().equals(genesisBlock.getHash())) {
-        throw new IllegalArgumentException(
-            "Supplied genesis block does not match stored chain data.");
+        throw new InvalidConfigurationException(
+            "Supplied genesis block does not match stored chain data.\n"
+                + "Please ensure the integrity of the file: \'pantheon/ethereum/core/src/main/resources/mainnet.json\'.\n"
+                + "To set a custom genesis file employ the runtime option \'--genesis=PATH_TO_FILE\'.");
       }
     }
   }

ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/util/InvalidConfigurationException.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018 ConsenSys AG.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package tech.pegasys.pantheon.ethereum.util;
+
+public class InvalidConfigurationException extends IllegalArgumentException {
+  public InvalidConfigurationException(final String message) {
+    super(message);
+  }
+}

ethereum/core/src/test/java/tech/pegasys/pantheon/ethereum/db/GenesisBlockMismatchTest.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2018 ConsenSys AG.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package tech.pegasys.pantheon.ethereum.db;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType;
+import static sun.security.krb5.Confounder.bytes;
+
+import tech.pegasys.pantheon.ethereum.core.Address;
+import tech.pegasys.pantheon.ethereum.core.Block;
+import tech.pegasys.pantheon.ethereum.core.BlockBody;
+import tech.pegasys.pantheon.ethereum.core.BlockHeader;
+import tech.pegasys.pantheon.ethereum.core.BlockHeaderBuilder;
+import tech.pegasys.pantheon.ethereum.core.Hash;
+import tech.pegasys.pantheon.ethereum.core.LogsBloomFilter;
+import tech.pegasys.pantheon.ethereum.mainnet.MainnetBlockHashFunction;
+import tech.pegasys.pantheon.ethereum.util.InvalidConfigurationException;
+import tech.pegasys.pantheon.services.kvstore.InMemoryKeyValueStorage;
+import tech.pegasys.pantheon.services.kvstore.KeyValueStorage;
+import tech.pegasys.pantheon.util.bytes.Bytes32;
+import tech.pegasys.pantheon.util.bytes.BytesValue;
+import tech.pegasys.pantheon.util.uint.UInt256;
+
+import java.util.Collections;
+
+import org.junit.Test;
+
+public class GenesisBlockMismatchTest {
+
+  @Test
+  public void suppliedGenesisBlockMismatchStoredChainDataException() {
+    KeyValueStorage kvStore = new InMemoryKeyValueStorage();
+    BlockHeader genesisHeader00 =
+        BlockHeaderBuilder.create()
+            .parentHash(Hash.ZERO)
+            .ommersHash(Hash.ZERO)
+            .coinbase(Address.fromHexString("0x0000000000000000000000000000000000000000"))
+            .stateRoot(Hash.ZERO)
+            .transactionsRoot(Hash.ZERO)
+            .receiptsRoot(Hash.ZERO)
+            .logsBloom(new LogsBloomFilter(BytesValue.of(bytes(LogsBloomFilter.BYTE_SIZE))))
+            .difficulty(UInt256.ZERO)
+            .number(0L)
+            .gasLimit(1L)
+            .gasUsed(1L)
+            .timestamp(0L)
+            .extraData(Bytes32.wrap(bytes(Bytes32.SIZE)))
+            .mixHash(Hash.ZERO)
+            .nonce(0L)
+            .blockHashFunction(MainnetBlockHashFunction::createHash)
+            .buildBlockHeader();
+    BlockBody genesisBody00 = new BlockBody(Collections.emptyList(), Collections.emptyList());
+    Block genesisBlock00 = new Block(genesisHeader00, genesisBody00);
+    DefaultMutableBlockchain blockchain00 =
+        new DefaultMutableBlockchain(genesisBlock00, kvStore, MainnetBlockHashFunction::createHash);
+
+    BlockHeader genesisHeader01 =
+        BlockHeaderBuilder.create()
+            .parentHash(Hash.ZERO)
+            .ommersHash(Hash.ZERO)
+            .coinbase(Address.fromHexString("0x0000000000000000000000000000000000000000"))
+            .stateRoot(Hash.ZERO)
+            .transactionsRoot(Hash.ZERO)
+            .receiptsRoot(Hash.ZERO)
+            .logsBloom(new LogsBloomFilter(BytesValue.of(bytes(LogsBloomFilter.BYTE_SIZE))))
+            .difficulty(UInt256.ZERO)
+            .number(0L)
+            .gasLimit(1L)
+            .gasUsed(1L)
+            .timestamp(0L)
+            .extraData(Bytes32.wrap(bytes(Bytes32.SIZE)))
+            .mixHash(Hash.ZERO)
+            .nonce(0L)
+            .blockHashFunction(MainnetBlockHashFunction::createHash)
+            .buildBlockHeader();
+    BlockBody genesisBody01 = new BlockBody(Collections.emptyList(), Collections.emptyList());
+    Block genesisBlock01 = new Block(genesisHeader01, genesisBody01);
+
+    assertThatExceptionOfType(InvalidConfigurationException.class)
+        .isThrownBy(() -> blockchain00.setGenesis(genesisBlock01))
+        .withMessageContaining(
+            "Supplied genesis block does not match stored chain data.\n"
+                + "Please ensure the integrity of the file: \'pantheon/ethereum/core/src/main/resources/mainnet.json\'.\n"
+                + "To set a custom genesis file employ the runtime option \'--genesis=PATH_TO_FILE\'.");
+  }
+}

pantheon/src/main/java/tech/pegasys/pantheon/cli/PantheonCommand.java

@@ -31,6 +31,7 @@ import tech.pegasys.pantheon.ethereum.jsonrpc.RpcApi;
 import tech.pegasys.pantheon.ethereum.jsonrpc.RpcApis;
 import tech.pegasys.pantheon.ethereum.jsonrpc.websocket.WebSocketConfiguration;
 import tech.pegasys.pantheon.ethereum.p2p.peers.DefaultPeer;
+import tech.pegasys.pantheon.ethereum.util.InvalidConfigurationException;
 import tech.pegasys.pantheon.util.BlockImporter;
 import tech.pegasys.pantheon.util.BlockchainImporter;
 import tech.pegasys.pantheon.util.bytes.BytesValue;
@@ -418,6 +419,8 @@ public class PantheonCommand implements Runnable {
           syncWithOttoman,
           new MiningParameters(coinbase, minTransactionGasPrice, extraData, isMiningEnabled),
           isDevMode);
+    } catch (final InvalidConfigurationException e) {
+      throw new ExecutionException(new CommandLine(this), e.getMessage());
     } catch (final IOException e) {
       throw new ExecutionException(new CommandLine(this), "Invalid path", e);
     }

pantheon/src/main/java/tech/pegasys/pantheon/controller/MainnetPantheonController.java

@@ -12,7 +12,6 @@
  */
 package tech.pegasys.pantheon.controller;
 
-import static org.apache.logging.log4j.LogManager.getLogger;
 import static tech.pegasys.pantheon.controller.KeyPairUtil.loadKeyPair;
 
 import tech.pegasys.pantheon.crypto.SECP256K1.KeyPair;
@@ -52,11 +51,12 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 public class MainnetPantheonController implements PantheonController<Void, EthHashBlockMiner> {
 
-  private static final Logger LOG = getLogger();
+  private static final Logger LOG = LogManager.getLogger();
   public static final int MAINNET_NETWORK_ID = 1;
 
   private final GenesisConfig<Void> genesisConfig;