New idiom to wrap checked exceptions to GuidanceException(s)

fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/ei/ZestGuidance.java

@@ -708,11 +708,8 @@ public void handleResult(Result result, Throwable error) throws GuidanceExceptio
                         nonZeroAfter);
 
                 // Save input to queue and to disk
-                try {
-                    saveCurrentInput(responsibilities, why);
-                } catch (IOException e) {
-                    throw new GuidanceException(e);
-                }
+                final String reason = why;
+                GuidanceException.wrap(() -> saveCurrentInput(responsibilities, reason));
 
             }
         } else if (result == Result.FAILURE || result == Result.TIMEOUT) {
@@ -734,30 +731,25 @@ public void handleResult(Result result, Throwable error) throws GuidanceExceptio
                 assert(currentInput.size() > 0) : String.format("Empty input: %s", currentInput.desc);
 
                 // Save crash to disk
-                try {
                     int crashIdx = uniqueFailures.size()-1;
                     String saveFileName = String.format("id_%06d", crashIdx);
                     File saveFile = new File(savedFailuresDirectory, saveFileName);
-                    writeCurrentInputToFile(saveFile);
+                    GuidanceException.wrap(() -> writeCurrentInputToFile(saveFile));
                     infoLog("%s","Found crash: " + error.getClass() + " - " + (msg != null ? msg : ""));
                     String how = currentInput.desc;
                     String why = result == Result.FAILURE ? "+crash" : "+hang";
                     infoLog("Saved - %s %s %s", saveFile.getPath(), how, why);
 
                     if (EXACT_CRASH_PATH != null && !EXACT_CRASH_PATH.equals("")) {
                         File exactCrashFile = new File(EXACT_CRASH_PATH);
-                        writeCurrentInputToFile(exactCrashFile);
+                        GuidanceException.wrap(() -> writeCurrentInputToFile(exactCrashFile));
                     }
 
                     // libFuzzerCompat stats are only displayed when they hit new coverage or crashes
                     if (console != null && LIBFUZZER_COMPAT_OUTPUT) {
                         displayStats();
                     }
 
-                } catch (IOException e) {
-                    throw new GuidanceException(e);
-                }
-
             }
         }
 

fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/guidance/GuidanceException.java

@@ -28,6 +28,8 @@
  */
 package edu.berkeley.cs.jqf.fuzz.guidance;
 
+import edu.berkeley.cs.jqf.fuzz.util.ThrowingRunnable;
+
 public class GuidanceException extends RuntimeException {
 
     public GuidanceException(String msg) {
@@ -42,5 +44,11 @@ public GuidanceException(String msg, Throwable e) {
         super(msg, e);
     }
 
-
+    public static void wrap(ThrowingRunnable task) {
+        try {
+            task.run();
+        } catch (Exception e) {
+            throw new GuidanceException(e);
+        }
+    }
 }

fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/util/ThrowingRunnable.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020, The Regents of the University of California
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package edu.berkeley.cs.jqf.fuzz.util;
+
+/**
+ * A version of {@link Runnable} that throws arbitrary, possibly checked, exceptions.
+ *
+ * Useful for wrapping checked exceptions with unchecked exceptions, such as during
+ * guided fuzzing.
+ *
+ * @see {@link edu.berkeley.cs.jqf.fuzz.guidance.GuidanceException#wrap(ThrowingRunnable)}
+ */
+@FunctionalInterface
+public interface ThrowingRunnable {
+    void run() throws Exception;
+}