Add realtime loopback STT prototype

src/python-runtime.ts

@@ -0,0 +1,63 @@
+import { constants as fsConstants } from "node:fs";
+import { access } from "node:fs/promises";
+import path from "node:path";
+import process from "node:process";
+
+import type { AppConfig } from "./config.js";
+
+function splitCommand(command: string): string[] {
+  const parts = command.match(/(?:[^\s"]+|"[^"]*")+/g) ?? [];
+  return parts.map((part) => part.replace(/^"(.*)"$/, "$1"));
+}
+
+async function fileExists(target: string): Promise<boolean> {
+  try {
+    await access(target, fsConstants.X_OK);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+export async function resolvePythonCommand(config: AppConfig): Promise<{ command: string; args: string[] }> {
+  return await resolveWorkerPythonCommand(config);
+}
+
+export async function resolveBasePythonCommand(config: AppConfig): Promise<{ command: string; args: string[] }> {
+  const configured = config.LOCAL_AI_PYTHON?.trim();
+  if (configured) {
+    const [command, ...args] = splitCommand(configured);
+    if (!command) {
+      throw new Error("LOCAL_AI_PYTHON 값이 비어 있습니다.");
+    }
+    return { command, args };
+  }
+
+  const venvPath = resolveVenvPythonPath(config);
+  if (await fileExists(venvPath)) {
+    return { command: venvPath, args: [] };
+  }
+
+  return await resolveBasePythonCommand(config);
+}
+
+export async function resolveWorkerPythonCommand(config: AppConfig): Promise<{ command: string; args: string[] }> {
+  const venvPath = resolveVenvPythonPath(config);
+  if (await fileExists(venvPath)) {
+    return { command: venvPath, args: [] };
+  }
+
+  return await resolveBasePythonCommand(config);
+}
+
+export function resolveVenvPythonPath(config: AppConfig): string {
+  const root = path.resolve(process.cwd(), config.LOCAL_AI_VENV_PATH);
+  if (process.platform === "win32") {
+    return path.join(root, "Scripts", "python.exe");
+  }
+  return path.join(root, "bin", "python");
+}
+
+export function resolveWorkerScript(name: string): string {
+  return path.resolve(process.cwd(), "python", name);
+}