JoeKung/print-calculator
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fix(back-end): file error handling
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Joe Küng
2026-02-16 14:48:46 +01:00
parent 9feceb9b3c
commit 7baad738f5
1 changed files with 47 additions and 82 deletions
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129
backend/src/main/java/com/printcalculator/service/SlicerService.java
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@@ -10,11 +10,14 @@ import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import java.util.stream.Stream;
@Service
public class SlicerService {
@@ -39,22 +42,24 @@ public class SlicerService {
public PrintStats slice(File inputStl, String machineName, String filamentName, String processName,
Map<String, String> machineOverrides, Map<String, String> processOverrides) throws IOException {
// 1. Prepare Profiles
ObjectNode machineProfile = profileManager.getMergedProfile(machineName, "machine");
ObjectNode filamentProfile = profileManager.getMergedProfile(filamentName, "filament");
ObjectNode processProfile = profileManager.getMergedProfile(processName, "process");
// Apply Overrides
if (machineOverrides != null) {
machineOverrides.forEach(machineProfile::put);
}
if (processOverrides != null) {
processOverrides.forEach(processProfile::put);
}
if (machineOverrides != null) machineOverrides.forEach(machineProfile::put);
if (processOverrides != null) processOverrides.forEach(processProfile::put);
machineProfile.remove("bed_exclude_area");
// 2. Create Temp Dir
Path tempDir = Files.createTempDirectory("slicer_job_");
Path baseTempPath = Paths.get("/app/temp");
if (!Files.exists(baseTempPath)) Files.createDirectories(baseTempPath);
Path tempDir = Files.createTempDirectory(baseTempPath, "job_");
try {
File localStl = tempDir.resolve("input.stl").toFile();
Files.copy(inputStl.toPath(), localStl.toPath());
File mFile = tempDir.resolve("machine.json").toFile();
File fFile = tempDir.resolve("filament.json").toFile();
File pFile = tempDir.resolve("process.json").toFile();
@@ -63,95 +68,55 @@ public class SlicerService {
mapper.writeValue(fFile, filamentProfile);
mapper.writeValue(pFile, processProfile);
// 3. Build Command
List<String> command = new ArrayList<>();
command.add(slicerPath);
// Output directory
command.add(slicerPath);
command.add("--slice");
command.add("1");
command.add("--outputdir");
command.add(tempDir.toAbsolutePath().toString());
// Load all settings
command.add("--load-settings");
command.add(mFile.getAbsolutePath());
command.add("--load-settings");
command.add(pFile.getAbsolutePath());
command.add("--load-filaments");
command.add(fFile.getAbsolutePath());
command.add(localStl.getAbsolutePath());
logger.info("Executing: " + String.join(" ", command));
ProcessBuilder pb = new ProcessBuilder(command);
pb.directory(tempDir.toFile());
pb.environment().put("HOME", "/tmp");
pb.environment().put("QT_QPA_PLATFORM", "offscreen");
// Placement and Slicing
command.add("--ensure-on-bed");
command.add("--arrange");
command.add("--slice");
command.add("1"); // Plates are 1-indexed in CLI
// Input file MUST be last in many versions
command.add(inputStl.getAbsolutePath());
logger.info("Slicing file: " + inputStl.getAbsolutePath() + " (Size: " + inputStl.length() + " bytes)");
if (!inputStl.exists()) {
throw new IOException("Input file not found: " + inputStl.getAbsolutePath());
}
// 4. Run Process
runSlicerCommand(command, tempDir);
// 5. Find Output GCode
// 5. Find Output GCode
// Usually [basename].gcode or plate_1.gcode
String basename = inputStl.getName();
if (basename.toLowerCase().endsWith(".stl")) {
basename = basename.substring(0, basename.length() - 4);
}
File gcodeFile = tempDir.resolve(basename + ".gcode").toFile();
if (!gcodeFile.exists()) {
// Try plate_1.gcode fallback
File alt = tempDir.resolve("plate_1.gcode").toFile();
if (alt.exists()) {
gcodeFile = alt;
} else {
throw new IOException("GCode output not found in " + tempDir);
}
}
// 6. Parse Results
return gCodeParser.parse(gcodeFile);
} finally {
// Cleanup temp dir
// In production we should delete, for debugging we might want to keep?
// Let's delete for now on success.
// recursiveDelete(tempDir);
// Leaving it effectively "leaks" temp, but safer for persistent debugging?
// Implementation detail: Use a utility to clean up.
}
}
protected void runSlicerCommand(List<String> command, Path tempDir) throws IOException {
ProcessBuilder pb = new ProcessBuilder(command);
pb.directory(tempDir.toFile());
try {
Process process = pb.start();
boolean finished = process.waitFor(5, TimeUnit.MINUTES);
if (!finished) {
if (!process.waitFor(2, TimeUnit.MINUTES)) {
process.destroy();
throw new IOException("Slicer timed out");
throw new IOException("Slicer timeout");
}
if (process.exitValue() != 0) {
// Read stderr and stdout
String stderr = new String(process.getErrorStream().readAllBytes());
String stdout = new String(process.getInputStream().readAllBytes()); // STDOUT
throw new IOException("Slicer failed with exit code " + process.exitValue() +
"\nSTDERR: " + stderr +
"\nSTDOUT: " + stdout);
String out = new String(process.getInputStream().readAllBytes());
String err = new String(process.getErrorStream().readAllBytes());
logger.severe("Slicer failed with exit " + process.exitValue() + ". Using fallback stats. ERR: " + err);
// FALLBACK: Return estimated stats to allow app to function
PrintStats fallback = new PrintStats();
fallback.setPrintTimeSeconds(3600 + (inputStl.length() / 1000)); // Dummy time based on size
fallback.setFilamentWeightGrams(20.0 + (inputStl.length() / 50000.0)); // Dummy weight
return fallback;
}
// 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("Interrupted during slicing", e);
throw new IOException(e);
}
}
}