Refactor multiple_sends module

mythril/analysis/modules/multiple_sends.py

@@ -17,11 +17,11 @@ log = logging.getLogger(__name__)
 
 class MultipleSendsAnnotation(StateAnnotation):
     def __init__(self) -> None:
-        self.calls = []  # type: List[Optional[Call]]
+        self.call_offsets = []  # type: List[int]
 
     def __copy__(self):
         result = MultipleSendsAnnotation()
-        result.calls = copy(self.calls)
+        result.call_offsets = copy(self.call_offsets)
         return result
 
 
@@ -62,51 +62,41 @@ def _analyze_state(state: GlobalState):
         list(state.get_annotations(MultipleSendsAnnotation)),
     )
     if len(annotations) == 0:
-        log.debug("Creating annotation for state")
         state.annotate(MultipleSendsAnnotation())
         annotations = cast(
             List[MultipleSendsAnnotation],
             list(state.get_annotations(MultipleSendsAnnotation)),
         )
 
-    calls = annotations[0].calls
+    call_offsets = annotations[0].call_offsets
 
     if instruction["opcode"] in ["CALL", "DELEGATECALL", "STATICCALL", "CALLCODE"]:
-        call = get_call_from_state(state)
-        if call:
-            calls += [call]
+        call_offsets.append(state.get_current_instruction()["address"])
 
     else:  # RETURN or STOP
-        if len(calls) > 1:
+        if len(call_offsets) > 1:
 
-            description_tail = (
-                "Consecutive calls are executed at the following bytecode offsets:\n"
-            )
+            for offset in call_offsets[1:]:
 
-            for call in calls:
-                description_tail += "Offset: {}\n".format(
-                    call.state.get_current_instruction()["address"]
+                description_tail = (
+                    "This call is executed after a previous call in the same transaction. "
+                    "Try to isolate each call, transfer or send into its own transaction."
                 )
 
-            description_tail += (
-                "Try to isolate each external call into its own transaction,"
-                " as external calls can fail accidentally or deliberately.\n"
-            )
-
-            issue = Issue(
-                contract=state.environment.active_account.contract_name,
-                function_name=state.environment.active_function_name,
-                address=instruction["address"],
-                swc_id=MULTIPLE_SENDS,
-                bytecode=state.environment.code.bytecode,
-                title="Multiple Calls in a Single Transaction",
-                severity="Medium",
-                description_head="Multiple sends are executed in one transaction.",
-                description_tail=description_tail,
-                gas_used=(state.mstate.min_gas_used, state.mstate.max_gas_used),
-            )
-
-            return [issue]
+                issue = Issue(
+                    contract=state.environment.active_account.contract_name,
+                    function_name=state.environment.active_function_name,
+                    address=offset,
+                    swc_id=MULTIPLE_SENDS,
+                    bytecode=state.environment.code.bytecode,
+                    title="Multiple Calls in a Single Transaction",
+                    severity="Low",
+                    description_head="Multiple calls are executed in the same transaction.",
+                    description_tail=description_tail,
+                    gas_used=(state.mstate.min_gas_used, state.mstate.max_gas_used),
+                )
+
+                return [issue]
 
     return []