fix(back-end): file error handling

backend/src/main/java/com/printcalculator/service/SlicerService.java

@@ -85,6 +85,22 @@ public class SlicerService {
 
             logger.info("Executing Slicer: " + String.join(" ", command));
 
+            runSlicerCommand(command, tempDir);
+
+            // Find any .gcode file
+            try (Stream<Path> s = Files.list(tempDir)) {
+                Optional<Path> found = s.filter(p -> p.toString().endsWith(".gcode")).findFirst();
+                if (found.isPresent()) return gCodeParser.parse(found.get().toFile());
+                else throw new IOException("No GCode found in " + tempDir);
+            }
+
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IOException(e);
+        }
+    }
+
+    protected void runSlicerCommand(List<String> command, Path tempDir) throws IOException, InterruptedException {
         ProcessBuilder pb = new ProcessBuilder(command);
         pb.directory(tempDir.toFile());
         pb.environment().put("HOME", "/tmp");
@@ -101,17 +117,5 @@ public class SlicerService {
             String err = new String(process.getErrorStream().readAllBytes());
             throw new IOException("Slicer failed with exit code " + process.exitValue() + "\nERR: " + err + "\nOUT: " + out);
         }
-
-            // Find any .gcode file
-            try (Stream<Path> s = Files.list(tempDir)) {
-                Optional<Path> found = s.filter(p -> p.toString().endsWith(".gcode")).findFirst();
-                if (found.isPresent()) return gCodeParser.parse(found.get().toFile());
-                else throw new IOException("No GCode found in " + tempDir);
-            }
-
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            throw new IOException(e);
-        }
     }
 }

backend/src/test/java/com/printcalculator/service/SlicerServiceTest.java

@@ -49,7 +49,7 @@ class SlicerServiceTest {
         // Subclass to override runSlicerCommand
         slicerService = new SlicerService("orca-slicer", profileManager, gCodeParser, mapper) {
             @Override
-            protected void runSlicerCommand(List<String> command, Path tempDir) throws IOException {
+            protected void runSlicerCommand(List<String> command, Path tempDir) throws IOException, InterruptedException {
                 lastCommand = command;
                 lastTempDir = tempDir;
                 // Don't run actual process.