fix: process blob values, update firebird dialect

plugins/dbgate-plugin-firebird/src/backend/helpers.js

@@ -89,6 +89,43 @@ function getFormattedDefaultValue(defaultValue) {
 
   return defaultValue.replace(/^default\s*/i, '');
 }
+function blobStreamToString(stream, encoding = 'utf8') {
+  return new Promise((resolve, reject) => {
+    const chunks = [];
+    stream.on('data', chunk => {
+      chunks.push(chunk);
+    });
+    stream.on('end', () => {
+      resolve(Buffer.concat(chunks).toString(encoding));
+    });
+    stream.on('error', err => {
+      reject(err);
+    });
+  });
+}
+
+async function normalizeRow(row) {
+  const entries = await Promise.all(
+    Object.entries(row).map(async ([key, value]) => {
+      if (value === null || value === undefined) return [key, null];
+      if (typeof value === 'function') {
+        const result = await new Promise((resolve, reject) => {
+          value(async (_err, _name, eventEmitter) => {
+            try {
+              const stringValue = await blobStreamToString(eventEmitter, 'utf8');
+              resolve(stringValue);
+            } catch (error) {
+              reject(error);
+            }
+          });
+        });
+        return [key, result];
+      }
+      return [key, value];
+    })
+  );
+  return Object.fromEntries(entries);
+}
 
 module.exports = {
   getDataTypeString,
@@ -96,4 +133,6 @@ module.exports = {
   getTriggerTiming,
   getFormattedDefaultValue,
   getTriggerCreateSql,
+  blobStreamToString,
+  normalizeRow,
 };