[Tracing API] Handling of multiple transactions in a block. (#304)

* Handle multiple transactions in the same block.
* Fix a bug in `BlockTracer`. The bug was causing multiple `TransactionTrace` to share the same list of `TraceFrame`.
A new method has been added in `DebugOperationTracer` to reset the list of frames for successive transactions in a block.

Signed-off-by: Abdelhamid Bakhta <abdelhamid.bakhta@consensys.net>

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/TraceReplayBlockTransactions.java

@@ -101,57 +101,57 @@ public class TraceReplayBlockTransactions extends AbstractBlockParameterMethod {
     return blockTracer
         .trace(block, new DebugOperationTracer(traceOptions))
         .map(BlockTrace::getTransactionTraces)
-        .map((traces) -> formatTraces(traces, traceTypeParameter))
+        .map((traces) -> generateTracesFromTransactionTrace(traces, traceTypeParameter))
         .orElse(null);
   }
 
-  private JsonNode formatTraces(
-      final List<TransactionTrace> traces, final TraceTypeParameter traceTypeParameter) {
+  private JsonNode generateTracesFromTransactionTrace(
+      final List<TransactionTrace> transactionTraces, final TraceTypeParameter traceTypeParameter) {
     final Set<TraceTypeParameter.TraceType> traceTypes = traceTypeParameter.getTraceTypes();
     final ObjectMapper mapper = new ObjectMapper();
     final ArrayNode resultArrayNode = mapper.createArrayNode();
-    final ObjectNode resultNode = mapper.createObjectNode();
     final AtomicInteger traceCounter = new AtomicInteger(0);
-    traces.stream()
-        .findFirst()
-        .ifPresent(
-            transactionTrace -> {
-              resultNode.put(
-                  "transactionHash", transactionTrace.getTransaction().getHash().toHexString());
-              resultNode.put("output", transactionTrace.getResult().getOutput().toString());
-            });
+    transactionTraces.forEach(
+        transactionTrace ->
+            handleTransactionTrace(
+                transactionTrace, traceTypes, mapper, resultArrayNode, traceCounter));
+    return resultArrayNode;
+  }
 
+  private void handleTransactionTrace(
+      final TransactionTrace transactionTrace,
+      final Set<TraceTypeParameter.TraceType> traceTypes,
+      final ObjectMapper mapper,
+      final ArrayNode resultArrayNode,
+      final AtomicInteger traceCounter) {
+    final ObjectNode resultNode = mapper.createObjectNode();
+    resultNode.put("transactionHash", transactionTrace.getTransaction().getHash().toHexString());
+    resultNode.put("output", transactionTrace.getResult().getOutput().toString());
+    setEmptyArrayIfNotPresent(resultNode, "trace");
+    setNullNodesIfNotPresent(resultNode, "vmTrace", "stateDiff");
     if (traceTypes.contains(TraceTypeParameter.TraceType.TRACE)) {
-      formatTraces(
+      generateTracesFromTransactionTrace(
           resultNode.putArray("trace")::addPOJO,
-          traces,
+          transactionTrace,
           FlatTraceGenerator::generateFromTransactionTrace,
           traceCounter);
     }
     if (traceTypes.contains(TraceTypeParameter.TraceType.VM_TRACE)) {
-      formatTraces(
+      generateTracesFromTransactionTrace(
           trace -> resultNode.putPOJO("vmTrace", trace),
-          traces,
-          (transactionTrace, ignored) ->
-              new VmTraceGenerator(transactionTrace).generateTraceStream(),
+          transactionTrace,
+          (__, ignored) -> new VmTraceGenerator(transactionTrace).generateTraceStream(),
           traceCounter);
     }
-
-    setEmptyArrayIfNotPresent(resultNode, "trace");
-    setNullNodesIfNotPresent(resultNode, "vmTrace", "stateDiff");
-
     resultArrayNode.add(resultNode);
-    return resultArrayNode;
   }
 
-  private void formatTraces(
+  private void generateTracesFromTransactionTrace(
       final TraceWriter writer,
-      final List<TransactionTrace> traces,
+      final TransactionTrace transactionTrace,
       final TraceFormatter formatter,
       final AtomicInteger traceCounter) {
-    traces.forEach(
-        (transactionTrace) ->
-            formatter.format(transactionTrace, traceCounter).forEachOrdered(writer::write));
+    formatter.format(transactionTrace, traceCounter).forEachOrdered(writer::write);
   }
 
   private void setNullNodesIfNotPresent(final ObjectNode parentNode, final String... keys) {

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/processor/BlockTracer.java

@@ -17,10 +17,12 @@ package org.hyperledger.besu.ethereum.api.jsonrpc.internal.processor;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.processor.BlockReplay.TransactionAction;
 import org.hyperledger.besu.ethereum.core.Block;
 import org.hyperledger.besu.ethereum.core.Hash;
+import org.hyperledger.besu.ethereum.debug.TraceFrame;
 import org.hyperledger.besu.ethereum.mainnet.TransactionProcessor;
 import org.hyperledger.besu.ethereum.vm.BlockHashLookup;
 import org.hyperledger.besu.ethereum.vm.DebugOperationTracer;
 
+import java.util.List;
 import java.util.Optional;
 
 /** Used to produce debug traces of blocks */
@@ -53,7 +55,9 @@ public class BlockTracer {
               tracer,
               new BlockHashLookup(header, blockchain),
               false);
-      return new TransactionTrace(transaction, result, tracer.getTraceFrames());
+      final List<TraceFrame> traceFrames = tracer.copyTraceFrames();
+      tracer.reset();
+      return new TransactionTrace(transaction, result, traceFrames);
     };
   }
 }

ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/trace/chain-data/src/blocks.json

@@ -40,6 +40,14 @@
           "gasPrice": "0xEF",
           "to": "0x0010000000000000000000000000000000000000",
           "data": "0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000002"
+        },
+        {
+          "comment": "Set contract storage (key,value)'s: (1,3),(2,4)",
+          "secretKey": "0xc87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3",
+          "gasLimit": "0xFFFFF2",
+          "gasPrice": "0xEF",
+          "to": "0x0010000000000000000000000000000000000000",
+          "data": "0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004"
         }
       ]
     },

ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/trace/specs/flat/trace_replayBlockTransactions_0x4.json

@@ -14,8 +14,8 @@
     "jsonrpc": "2.0",
     "result": [
       {
+        "transactionHash": "0x4de634fe767d1f6d0512ca0c9c0a054d3a2596f7cdd7c1eea5f93046a740b3c7",
         "output": "0x",
-        "stateDiff": null,
         "trace": [
           {
             "action": {
@@ -31,13 +31,37 @@
               "output": "0x"
             },
             "subtraces": 0,
-            "traceAddress": [
-            ],
+            "traceAddress": [],
             "type": "call"
           }
         ],
-        "transactionHash": "0x4de634fe767d1f6d0512ca0c9c0a054d3a2596f7cdd7c1eea5f93046a740b3c7",
-        "vmTrace": null
+        "vmTrace": null,
+        "stateDiff": null
+      },
+      {
+        "transactionHash": "0xf882ec206292910527fd7095e59a1ca027b873296f1eba3886aa1addc4ff0ab9",
+        "output": "0x",
+        "trace": [
+          {
+            "action": {
+              "callType": "call",
+              "from": "0x627306090abab3a6e1400e9345bc60c78a8bef57",
+              "gas": "0xffaaea",
+              "input": "0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004",
+              "to": "0x0010000000000000000000000000000000000000",
+              "value": "0x0"
+            },
+            "result": {
+              "gasUsed": "0x9c58",
+              "output": "0x"
+            },
+            "subtraces": 0,
+            "traceAddress": [],
+            "type": "call"
+          }
+        ],
+        "vmTrace": null,
+        "stateDiff": null
       }
     ],
     "id": 415

ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/trace/specs/vm-trace/trace_vmTrace_replayBlockTransactions_0x4.json

@@ -16,7 +16,8 @@
       {
         "output": "0x",
         "stateDiff": null,
-        "trace": [],
+        "trace": [
+        ],
         "transactionHash": "0x4de634fe767d1f6d0512ca0c9c0a054d3a2596f7cdd7c1eea5f93046a740b3c7",
         "vmTrace": {
           "code": "0x6020356000355560603560403555",
@@ -77,7 +78,8 @@
               "cost": 20000,
               "ex": {
                 "mem": null,
-                "push": [],
+                "push": [
+                ],
                 "store": {
                   "key": "0x1",
                   "val": "0x1"
@@ -143,7 +145,8 @@
               "cost": 20000,
               "ex": {
                 "mem": null,
-                "push": [],
+                "push": [
+                ],
                 "store": {
                   "key": "0x2",
                   "val": "0x2"
@@ -155,6 +158,152 @@
             }
           ]
         }
+      },
+      {
+        "output": "0x",
+        "stateDiff": null,
+        "trace": [
+        ],
+        "transactionHash": "0xf882ec206292910527fd7095e59a1ca027b873296f1eba3886aa1addc4ff0ab9",
+        "vmTrace": {
+          "code": "0x6020356000355560603560403555",
+          "ops": [
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x20"
+                ],
+                "store": null,
+                "used": 16755431
+              },
+              "pc": 0,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x3"
+                ],
+                "store": null,
+                "used": 16755428
+              },
+              "pc": 2,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x0"
+                ],
+                "store": null,
+                "used": 16755425
+              },
+              "pc": 3,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x1"
+                ],
+                "store": null,
+                "used": 16755422
+              },
+              "pc": 5,
+              "sub": null
+            },
+            {
+              "cost": 20000,
+              "ex": {
+                "mem": null,
+                "push": [
+                ],
+                "store": {
+                  "key": "0x1",
+                  "val": "0x3"
+                },
+                "used": 16735422
+              },
+              "pc": 6,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x60"
+                ],
+                "store": null,
+                "used": 16735419
+              },
+              "pc": 7,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x4"
+                ],
+                "store": null,
+                "used": 16735416
+              },
+              "pc": 9,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x40"
+                ],
+                "store": null,
+                "used": 16735413
+              },
+              "pc": 10,
+              "sub": null
+            },
+            {
+              "cost": 3,
+              "ex": {
+                "mem": null,
+                "push": [
+                  "0x2"
+                ],
+                "store": null,
+                "used": 16735410
+              },
+              "pc": 12,
+              "sub": null
+            },
+            {
+              "cost": 20000,
+              "ex": {
+                "mem": null,
+                "push": [
+                ],
+                "store": {
+                  "key": "0x2",
+                  "val": "0x4"
+                },
+                "used": 16715410
+              },
+              "pc": 13,
+              "sub": null
+            }
+          ]
+        }
       }
     ],
     "id": 415

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/vm/DebugOperationTracer.java

@@ -35,7 +35,7 @@ import org.apache.tuweni.units.bigints.UInt256;
 public class DebugOperationTracer implements OperationTracer {
 
   private final TraceOptions options;
-  private final List<TraceFrame> traceFrames = new ArrayList<>();
+  private List<TraceFrame> traceFrames = new ArrayList<>();
   private TraceFrame lastFrame;
 
   public DebugOperationTracer(final TraceOptions options) {
@@ -140,4 +140,13 @@ public class DebugOperationTracer implements OperationTracer {
   public List<TraceFrame> getTraceFrames() {
     return traceFrames;
   }
+
+  public void reset() {
+    traceFrames = new ArrayList<>();
+    lastFrame = null;
+  }
+
+  public List<TraceFrame> copyTraceFrames() {
+    return new ArrayList<>(traceFrames);
+  }
 }