Streaming: Refactor move database and redis logic into separate files (#31567)

streaming/utils.js

@@ -59,3 +59,23 @@ export function firstParam(arrayOrString) {
     return arrayOrString;
   }
 }
+
+/**
+ * Takes an environment variable that should be an integer, attempts to parse
+ * it falling back to a default if not set, and handles errors parsing.
+ * @param {string|undefined} value
+ * @param {number} defaultValue
+ * @param {string} variableName
+ * @returns {number}
+ */
+export function parseIntFromEnvValue(value, defaultValue, variableName) {
+  if (typeof value === 'string' && value.length > 0) {
+    const parsedValue = parseInt(value, 10);
+    if (isNaN(parsedValue)) {
+      throw new Error(`Invalid ${variableName} environment variable: ${value}`);
+    }
+    return parsedValue;
+  } else {
+    return defaultValue;
+  }
+}