Initial commit

shared/idempotency.js

@@ -0,0 +1,29 @@
+const path = require('path');
+const { createHash } = require('crypto');
+const { idempotencyDir } = require('./paths');
+const { readJsonIfExists, writeJson } = require('./fs');
+
+function recordPath(scope, key) {
+  const hash = createHash('sha256').update(`${scope}:${key}`).digest('hex');
+  return path.join(idempotencyDir, scope, `${hash}.json`);
+}
+
+async function getIdempotencyRecord(scope, key) {
+  return readJsonIfExists(recordPath(scope, key));
+}
+
+async function saveIdempotencyRecord(scope, key, value) {
+  await writeJson(recordPath(scope, key), {
+    schema_version: 'v1',
+    scope,
+    key,
+    value,
+    created_at: new Date().toISOString(),
+  });
+}
+
+module.exports = {
+  getIdempotencyRecord,
+  saveIdempotencyRecord,
+};
+