| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | retryshared.h |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file contains shared retry helper functions. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #pragma once |
| 16 | |
| 17 | namespace wsl::shared::retry { |
| 18 | |
| 19 | constexpr auto AlwaysRetry = []() { return true; }; |
| 20 | |
| 21 | template <typename T, typename TPeriod, typename TTimeout> |
| 22 | T RetryWithTimeout(const std::function<T()>& routine, TPeriod retryPeriod, TTimeout timeout, const std::function<bool()>& retryPred = AlwaysRetry) |
| 23 | { |
| 24 | auto stop = std::chrono::steady_clock::now() + timeout; |
| 25 | for (;;) |
| 26 | { |
| 27 | try |
| 28 | { |
| 29 | return routine(); |
| 30 | } |
| 31 | catch (...) |
| 32 | { |
| 33 | if (!retryPred() || std::chrono::steady_clock::now() > stop) |
| 34 | { |
| 35 | throw; |
| 36 | } |
| 37 | |
| 38 | std::this_thread::sleep_for(retryPeriod); |
| 39 | } |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | #ifdef WIN32 |
| 44 | |
| 45 | template <typename T, typename TPeriod, typename TTimeout> |
| 46 | T RetryWithTimeout(const std::function<T()>& routine, TPeriod retryPeriod, TTimeout timeout, std::vector<HRESULT>&& retryErrors) |
| 47 | { |
| 48 | auto pred = [retryErrors = std::move(retryErrors)]() { |
| 49 | auto hr = HRESULT_FROM_WIN32(GetLastError()); |
| 50 | return std::find(retryErrors.begin(), retryErrors.end(), hr) != retryErrors.end(); |
| 51 | }; |
| 52 | |
| 53 | return RetryWithTimeout(routine, retryPeriod, timeout, pred); |
| 54 | } |
| 55 | |
| 56 | #endif |
| 57 | |
| 58 | } // namespace wsl::shared::retry |