Initial commit

shared/snapshots.js

@@ -0,0 +1,80 @@
+const path = require('path');
+const { randomUUID } = require('crypto');
+const { snapshotsSystemDir, snapshotsTenantsDir } = require('./paths');
+const { readJsonIfExists, writeJson } = require('./fs');
+const { listAllResources } = require('./resources');
+
+function buildResourceDiff(resource) {
+  return {
+    in_sync: JSON.stringify(resource.desired_state || {}) === JSON.stringify(resource.current_state || {}),
+    desired_state: resource.desired_state || {},
+    current_state: resource.current_state || {},
+  };
+}
+
+function filterTenantResources(resources, tenantId) {
+  const filtered = {};
+
+  for (const [resourceType, items] of Object.entries(resources)) {
+    filtered[resourceType] = items.filter((item) => {
+      if (!item) {
+        return false;
+      }
+
+      if (resourceType === 'tenant') {
+        return item.id === tenantId;
+      }
+
+      return item.desired_state && item.desired_state.tenant_id === tenantId;
+    });
+  }
+
+  return filtered;
+}
+
+async function createSnapshot(scope, context) {
+  const resources = await listAllResources();
+  const selected = scope === 'system'
+    ? resources
+    : filterTenantResources(resources, scope.replace('tenant:', ''));
+
+  const snapshot = {
+    snapshot_id: randomUUID(),
+    schema_version: 'v1',
+    scope,
+    created_at: new Date().toISOString(),
+    request_id: context.request_id,
+    correlation_id: context.correlation_id,
+    resources: selected,
+    diffs: Object.fromEntries(
+      Object.entries(selected).map(([resourceType, items]) => [
+        resourceType,
+        items.map((item) => ({
+          resource_id: item.id,
+          diff: buildResourceDiff(item),
+        })),
+      ])
+    ),
+  };
+
+  const filePath = scope === 'system'
+    ? path.join(snapshotsSystemDir, 'latest.json')
+    : path.join(snapshotsTenantsDir, `${scope.replace('tenant:', '')}.json`);
+
+  await writeJson(filePath, snapshot);
+  return snapshot;
+}
+
+async function getLatestSystemSnapshot() {
+  return readJsonIfExists(path.join(snapshotsSystemDir, 'latest.json'));
+}
+
+async function getLatestTenantSnapshot(tenantId) {
+  return readJsonIfExists(path.join(snapshotsTenantsDir, `${tenantId}.json`));
+}
+
+module.exports = {
+  createSnapshot,
+  getLatestSystemSnapshot,
+  getLatestTenantSnapshot,
+};