Improve IndexedDB module rollback handling

website/src/features/toolboxes/storage/optimisticModuleData.js

@@ -0,0 +1,56 @@
+// Rôle : fournit les helpers purs de versioning et rollback optimiste des données modules.
+function hasOwnValue(data, key) {
+  return Object.prototype.hasOwnProperty.call(data, key);
+}
+
+function uniqueKeys(keys) {
+  return [...new Set((Array.isArray(keys) ? keys : []).map((key) => String(key || "")).filter(Boolean))];
+}
+
+export function createModuleDataCheckpoint(moduleData, versionsByKey, key) {
+  const version = (versionsByKey[key] || 0) + 1;
+  return {
+    key,
+    version,
+    hadValue: hasOwnValue(moduleData, key),
+    value: moduleData[key]
+  };
+}
+
+export function createModuleDataCheckpoints(moduleData, versionsByKey, keys) {
+  return uniqueKeys(keys).map((key) => createModuleDataCheckpoint(moduleData, versionsByKey, key));
+}
+
+export function commitModuleDataCheckpoints(versionsByKey, checkpoints) {
+  const nextVersions = { ...versionsByKey };
+  checkpoints.forEach((checkpoint) => {
+    nextVersions[checkpoint.key] = checkpoint.version;
+  });
+  return nextVersions;
+}
+
+export function applyModuleDataValue(moduleData, key, value) {
+  const nextModuleData = { ...moduleData };
+  if (value == null) delete nextModuleData[key];
+  else nextModuleData[key] = value;
+  return nextModuleData;
+}
+
+export function removeModuleDataKeys(moduleData, keys) {
+  const nextModuleData = { ...moduleData };
+  uniqueKeys(keys).forEach((key) => {
+    delete nextModuleData[key];
+  });
+  return nextModuleData;
+}
+
+export function rollbackModuleDataCheckpoints(moduleData, versionsByKey, checkpoints) {
+  let nextModuleData = moduleData;
+  checkpoints.forEach((checkpoint) => {
+    if (versionsByKey[checkpoint.key] !== checkpoint.version) return;
+    if (nextModuleData === moduleData) nextModuleData = { ...moduleData };
+    if (checkpoint.hadValue) nextModuleData[checkpoint.key] = checkpoint.value;
+    else delete nextModuleData[checkpoint.key];
+  });
+  return nextModuleData;
+}