fix: corrupt model download

Author: namchuai

engine/services/download_service.cc

@@ -6,6 +6,7 @@
 #include <mutex>
 #include <optional>
 #include <ostream>
+#include <utility>
 #include "download_service.h"
 #include "utils/format_utils.h"
 #include "utils/result.hpp"
@@ -238,7 +239,7 @@ void DownloadService::WorkerThread() {
 
 void DownloadService::ProcessTask(DownloadTask& task) {
   CTL_INF("Processing task: " + task.id);
-  std::vector<CURL*> task_handles;
+  std::vector<std::pair<CURL*, FILE*>> task_handles;
 
   downloading_data_ = std::make_shared<DownloadingData>(DownloadingData{
       .item_id = "",
@@ -247,7 +248,7 @@ void DownloadService::ProcessTask(DownloadTask& task) {
   });
 
   for (auto& item : task.items) {
-    auto handle = curl_easy_init();
+    CURL* handle = curl_easy_init();
     if (handle == nullptr) {
       // skip the task
       CTL_ERR("Failed to init curl!");
@@ -270,7 +271,7 @@ void DownloadService::ProcessTask(DownloadTask& task) {
     curl_easy_setopt(handle, CURLOPT_XFERINFODATA, downloading_data_.get());
 
     curl_multi_add_handle(multi_handle_, handle);
-    task_handles.push_back(handle);
+    task_handles.push_back(std::make_pair(handle, file));
     CTL_INF("Adding item to multi curl: " + item.ToString());
   }
 
@@ -300,9 +301,10 @@ void DownloadService::ProcessTask(DownloadTask& task) {
   }
 
   ProcessCompletedTransfers();
-  for (auto handle : task_handles) {
-    curl_multi_remove_handle(multi_handle_, handle);
-    curl_easy_cleanup(handle);
+  for (auto pair : task_handles) {
+    curl_multi_remove_handle(multi_handle_, pair.first);
+    curl_easy_cleanup(pair.first);
+    fclose(pair.second);
     downloading_data_.reset();
   }