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2cc9dd8e73
#rb andrew.ladenberger #rnx #ROBOMERGE-SOURCE: CL 12223288 via CL 12223309 via CL 12223311 #ROBOMERGE-BOT: (v663-12210973) [CL 12223313 by jordan cristiano in Main branch]
592 lines
19 KiB
C++
592 lines
19 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "HttpRetrySystem.h"
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#include "HAL/PlatformTime.h"
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#include "HAL/PlatformProcess.h"
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#include "Math/RandomStream.h"
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#include "HttpModule.h"
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#include "Http.h"
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#include "HttpManager.h"
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#include "Stats/Stats.h"
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namespace FHttpRetrySystem
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{
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TOptional<double> ReadThrottledTimeFromResponseInSeconds(FHttpResponsePtr Response)
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{
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TOptional<double> LockoutPeriod;
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// Check if there was a Retry-After header
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if (Response.IsValid())
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{
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int32 ResponseCode = Response->GetResponseCode();
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if (ResponseCode == EHttpResponseCodes::TooManyRequests || ResponseCode == EHttpResponseCodes::ServiceUnavail)
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{
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FString RetryAfter = Response->GetHeader(TEXT("Retry-After"));
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if (!RetryAfter.IsEmpty())
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{
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if (RetryAfter.IsNumeric())
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{
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// seconds
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LockoutPeriod.Emplace(FCString::Atof(*RetryAfter));
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}
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else
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{
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// http date
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FDateTime UTCServerTime;
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if (FDateTime::ParseHttpDate(RetryAfter, UTCServerTime))
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{
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const FDateTime UTCNow = FDateTime::UtcNow();
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LockoutPeriod.Emplace((UTCServerTime - UTCNow).GetTotalSeconds());
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}
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}
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}
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else
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{
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FString RateLimitReset = Response->GetHeader(TEXT("X-Rate-Limit-Reset"));
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if (!RateLimitReset.IsEmpty())
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{
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// UTC seconds
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const FDateTime UTCServerTime = FDateTime::FromUnixTimestamp(FCString::Atoi64(*RateLimitReset));
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const FDateTime UTCNow = FDateTime::UtcNow();
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LockoutPeriod.Emplace((UTCServerTime - UTCNow).GetTotalSeconds());
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}
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}
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}
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}
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return LockoutPeriod;
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}
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}
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FHttpRetrySystem::FRequest::FRequest(
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FManager& InManager,
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const TSharedRef<IHttpRequest>& HttpRequest,
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const FHttpRetrySystem::FRetryLimitCountSetting& InRetryLimitCountOverride,
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const FHttpRetrySystem::FRetryTimeoutRelativeSecondsSetting& InRetryTimeoutRelativeSecondsOverride,
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const FHttpRetrySystem::FRetryResponseCodes& InRetryResponseCodes,
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const FHttpRetrySystem::FRetryVerbs& InRetryVerbs,
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const FHttpRetrySystem::FRetryDomainsPtr& InRetryDomains
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)
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: FHttpRequestAdapterBase(HttpRequest)
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, Status(FHttpRetrySystem::FRequest::EStatus::NotStarted)
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, RetryLimitCountOverride(InRetryLimitCountOverride)
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, RetryTimeoutRelativeSecondsOverride(InRetryTimeoutRelativeSecondsOverride)
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, RetryResponseCodes(InRetryResponseCodes)
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, RetryVerbs(InRetryVerbs)
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, RetryDomains(InRetryDomains)
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, RetryManager(InManager)
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{
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// if the InRetryTimeoutRelativeSecondsOverride override is being used the value cannot be negative
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check(!(InRetryTimeoutRelativeSecondsOverride.IsSet()) || (InRetryTimeoutRelativeSecondsOverride.GetValue() >= 0.0));
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if (RetryDomains.IsValid())
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{
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if (RetryDomains->Domains.Num() == 0)
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{
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// If there are no domains to cycle through, go through the simpler path
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RetryDomains.Reset();
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}
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else
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{
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// Start with the active index
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RetryDomainsIndex = RetryDomains->ActiveIndex;
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check(RetryDomains->Domains.IsValidIndex(RetryDomainsIndex));
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}
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}
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}
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bool FHttpRetrySystem::FRequest::ProcessRequest()
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{
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TSharedRef<FRequest> RetryRequest = StaticCastSharedRef<FRequest>(AsShared());
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OriginalUrl = HttpRequest->GetURL();
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if (RetryDomains.IsValid())
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{
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SetUrlFromRetryDomains();
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}
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HttpRequest->OnRequestProgress().BindSP(RetryRequest, &FHttpRetrySystem::FRequest::HttpOnRequestProgress);
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return RetryManager.ProcessRequest(RetryRequest);
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}
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void FHttpRetrySystem::FRequest::SetUrlFromRetryDomains()
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{
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check(RetryDomains.IsValid());
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FString OriginalUrlDomain = FPlatformHttp::GetUrlDomain(OriginalUrl);
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if (!OriginalUrlDomain.IsEmpty())
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{
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const FString Url(OriginalUrl.Replace(*OriginalUrlDomain, *RetryDomains->Domains[RetryDomainsIndex]));
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HttpRequest->SetURL(Url);
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}
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}
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void FHttpRetrySystem::FRequest::MoveToNextRetryDomain()
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{
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check(RetryDomains.IsValid());
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const int32 NextDomainIndex = (RetryDomainsIndex + 1) % RetryDomains->Domains.Num();
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if (RetryDomains->ActiveIndex.CompareExchange(RetryDomainsIndex, NextDomainIndex))
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{
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RetryDomainsIndex = NextDomainIndex;
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}
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SetUrlFromRetryDomains();
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}
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void FHttpRetrySystem::FRequest::CancelRequest()
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{
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TSharedRef<FRequest> RetryRequest = StaticCastSharedRef<FRequest>(AsShared());
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RetryManager.CancelRequest(RetryRequest);
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}
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void FHttpRetrySystem::FRequest::HttpOnRequestProgress(FHttpRequestPtr InHttpRequest, int32 BytesSent, int32 BytesRcv)
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{
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OnRequestProgress().ExecuteIfBound(AsShared(), BytesSent, BytesRcv);
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}
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FHttpRetrySystem::FManager::FManager(const FRetryLimitCountSetting& InRetryLimitCountDefault, const FRetryTimeoutRelativeSecondsSetting& InRetryTimeoutRelativeSecondsDefault)
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: RandomFailureRate(FRandomFailureRateSetting())
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, RetryLimitCountDefault(InRetryLimitCountDefault)
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, RetryTimeoutRelativeSecondsDefault(InRetryTimeoutRelativeSecondsDefault)
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{}
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TSharedRef<FHttpRetrySystem::FRequest> FHttpRetrySystem::FManager::CreateRequest(
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const FRetryLimitCountSetting& InRetryLimitCountOverride,
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const FRetryTimeoutRelativeSecondsSetting& InRetryTimeoutRelativeSecondsOverride,
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const FRetryResponseCodes& InRetryResponseCodes,
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const FRetryVerbs& InRetryVerbs,
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const FRetryDomainsPtr& InRetryDomains)
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{
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return MakeShareable(new FRequest(
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*this,
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FHttpModule::Get().CreateRequest(),
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InRetryLimitCountOverride,
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InRetryTimeoutRelativeSecondsOverride,
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InRetryResponseCodes,
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InRetryVerbs,
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InRetryDomains
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));
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}
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bool FHttpRetrySystem::FManager::ShouldRetry(const FHttpRetryRequestEntry& HttpRetryRequestEntry)
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{
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bool bResult = false;
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FHttpResponsePtr Response = HttpRetryRequestEntry.Request->GetResponse();
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// invalid response means connection or network error but we need to know which one
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if (!Response.IsValid())
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{
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// ONLY retry bad responses if they are connection errors (NOT protocol errors or unknown) otherwise request may be sent (and processed!) twice
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EHttpRequestStatus::Type Status = HttpRetryRequestEntry.Request->GetStatus();
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if (Status == EHttpRequestStatus::Failed_ConnectionError)
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{
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bResult = true;
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}
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else if (Status == EHttpRequestStatus::Failed)
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{
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const FName Verb = FName(*HttpRetryRequestEntry.Request->GetVerb());
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// Be default, we will also allow retry for GET and HEAD requests even if they may duplicate on the server
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static const TSet<FName> DefaultRetryVerbs(TArray<FName>({ FName(TEXT("GET")), FName(TEXT("HEAD")) }));
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const bool bIsRetryVerbsEmpty = HttpRetryRequestEntry.Request->RetryVerbs.Num() == 0;
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if (bIsRetryVerbsEmpty && DefaultRetryVerbs.Contains(Verb))
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{
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bResult = true;
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}
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// If retry verbs are specified, only allow retrying the specified list of verbs
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else if (HttpRetryRequestEntry.Request->RetryVerbs.Contains(Verb))
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{
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bResult = true;
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}
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}
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}
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else
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{
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// this may be a successful response with one of the explicitly listed response codes we want to retry on
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if (HttpRetryRequestEntry.Request->RetryResponseCodes.Contains(Response->GetResponseCode()))
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{
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bResult = true;
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}
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}
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return bResult;
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}
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bool FHttpRetrySystem::FManager::CanRetry(const FHttpRetryRequestEntry& HttpRetryRequestEntry)
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{
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bool bResult = false;
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bool bShouldTestCurrentRetryCount = false;
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double RetryLimitCount = 0;
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if (HttpRetryRequestEntry.Request->RetryLimitCountOverride.IsSet())
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{
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bShouldTestCurrentRetryCount = true;
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RetryLimitCount = HttpRetryRequestEntry.Request->RetryLimitCountOverride.GetValue();
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}
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else if (RetryLimitCountDefault.IsSet())
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{
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bShouldTestCurrentRetryCount = true;
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RetryLimitCount = RetryLimitCountDefault.GetValue();
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}
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if (bShouldTestCurrentRetryCount)
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{
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if (HttpRetryRequestEntry.CurrentRetryCount < RetryLimitCount)
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{
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bResult = true;
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}
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}
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return bResult;
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}
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bool FHttpRetrySystem::FManager::HasTimedOut(const FHttpRetryRequestEntry& HttpRetryRequestEntry, const double NowAbsoluteSeconds)
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{
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bool bResult = false;
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bool bShouldTestRetryTimeout = false;
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double RetryTimeoutAbsoluteSeconds = HttpRetryRequestEntry.RequestStartTimeAbsoluteSeconds;
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if (HttpRetryRequestEntry.Request->RetryTimeoutRelativeSecondsOverride.IsSet())
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{
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bShouldTestRetryTimeout = true;
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RetryTimeoutAbsoluteSeconds += HttpRetryRequestEntry.Request->RetryTimeoutRelativeSecondsOverride.GetValue();
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}
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else if (RetryTimeoutRelativeSecondsDefault.IsSet())
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{
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bShouldTestRetryTimeout = true;
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RetryTimeoutAbsoluteSeconds += RetryTimeoutRelativeSecondsDefault.GetValue();
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}
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if (bShouldTestRetryTimeout)
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{
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if (NowAbsoluteSeconds >= RetryTimeoutAbsoluteSeconds)
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{
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bResult = true;
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}
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}
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return bResult;
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}
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float FHttpRetrySystem::FManager::GetLockoutPeriodSeconds(const FHttpRetryRequestEntry& HttpRetryRequestEntry)
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{
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float LockoutPeriod = 0.0f;
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TOptional<double> ResponseLockoutPeriod = FHttpRetrySystem::ReadThrottledTimeFromResponseInSeconds(HttpRetryRequestEntry.Request->GetResponse());
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if (ResponseLockoutPeriod.IsSet())
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{
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LockoutPeriod = static_cast<float>(ResponseLockoutPeriod.GetValue());
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}
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if (HttpRetryRequestEntry.CurrentRetryCount >= 1)
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{
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if (LockoutPeriod <= 0.0f)
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{
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const bool bFailedToConnect = HttpRetryRequestEntry.Request->GetStatus() == EHttpRequestStatus::Failed_ConnectionError;
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const bool bHasRetryDomains = HttpRetryRequestEntry.Request->RetryDomains.IsValid();
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// Skip the lockout period if we failed to connect to a domain and we have other domains to try
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const bool bSkipLockoutPeriod = (bFailedToConnect && bHasRetryDomains);
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if (!bSkipLockoutPeriod)
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{
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constexpr const float LockoutPeriodMinimumSeconds = 5.0f;
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constexpr const float LockoutPeriodEscalationSeconds = 2.5f;
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constexpr const float LockoutPeriodMaxSeconds = 30.0f;
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LockoutPeriod = LockoutPeriodMinimumSeconds + LockoutPeriodEscalationSeconds * (HttpRetryRequestEntry.CurrentRetryCount - 1);
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LockoutPeriod = FMath::Min(LockoutPeriod, LockoutPeriodMaxSeconds);
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}
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}
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}
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return LockoutPeriod;
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}
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static FRandomStream temp(4435261);
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bool FHttpRetrySystem::FManager::Update(uint32* FileCount, uint32* FailingCount, uint32* FailedCount, uint32* CompletedCount)
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{
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QUICK_SCOPE_CYCLE_COUNTER(STAT_FHttpRetrySystem_FManager_Update);
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LLM_SCOPE(ELLMTag::Networking);
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bool bIsGreen = true;
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if (FileCount != nullptr)
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{
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*FileCount = RequestList.Num();
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}
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const double NowAbsoluteSeconds = FPlatformTime::Seconds();
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// Basic algorithm
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// for each managed item
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// if the item hasn't timed out
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// if the item's retry state is NotStarted
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// if the item's request's state is not NotStarted
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// move the item's retry state to Processing
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// endif
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// endif
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// if the item's retry state is Processing
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// if the item's request's state is Failed
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// flag return code to false
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// if the item can be retried
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// increment FailingCount if applicable
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// retry the item's request
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// increment the item's retry count
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// else
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// increment FailedCount if applicable
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// set the item's retry state to FailedRetry
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// endif
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// else if the item's request's state is Succeeded
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// endif
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// endif
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// else
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// flag return code to false
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// set the item's retry state to FailedTimeout
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// increment FailedCount if applicable
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// endif
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// if the item's retry state is FailedRetry
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// do stuff
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// endif
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// if the item's retry state is FailedTimeout
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// do stuff
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// endif
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// if the item's retry state is Succeeded
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// do stuff
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// endif
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// endfor
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int32 index = 0;
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while (index < RequestList.Num())
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{
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FHttpRetryRequestEntry& HttpRetryRequestEntry = RequestList[index];
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TSharedRef<FHttpRetrySystem::FRequest>& HttpRetryRequest = HttpRetryRequestEntry.Request;
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const EHttpRequestStatus::Type RequestStatus = HttpRetryRequest->GetStatus();
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if (HttpRetryRequestEntry.bShouldCancel)
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{
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UE_LOG(LogHttp, Warning, TEXT("Request cancelled on %s"), *(HttpRetryRequest->GetURL()));
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::Cancelled;
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}
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else
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{
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if (!HasTimedOut(HttpRetryRequestEntry, NowAbsoluteSeconds))
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{
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if (HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::NotStarted)
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{
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if (RequestStatus != EHttpRequestStatus::NotStarted)
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{
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::Processing;
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}
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}
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if (HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::Processing)
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{
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bool forceFail = false;
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// Code to simulate request failure
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if (RequestStatus == EHttpRequestStatus::Succeeded && RandomFailureRate.IsSet())
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{
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float random = temp.GetFraction();
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if (random < RandomFailureRate.GetValue())
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{
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forceFail = true;
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}
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}
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// If we failed to connect, try the next domain in the list
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if (RequestStatus == EHttpRequestStatus::Failed_ConnectionError)
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{
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if (HttpRetryRequest->RetryDomains.IsValid())
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{
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HttpRetryRequest->MoveToNextRetryDomain();
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}
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}
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// Save these for failure case retry checks if we hit a completion state
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bool bShouldRetry = false;
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bool bCanRetry = false;
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if (RequestStatus == EHttpRequestStatus::Failed || RequestStatus == EHttpRequestStatus::Failed_ConnectionError || RequestStatus == EHttpRequestStatus::Succeeded)
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{
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bShouldRetry = ShouldRetry(HttpRetryRequestEntry);
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bCanRetry = CanRetry(HttpRetryRequestEntry);
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}
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if (RequestStatus == EHttpRequestStatus::Failed || RequestStatus == EHttpRequestStatus::Failed_ConnectionError || forceFail || (bShouldRetry && bCanRetry))
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{
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bIsGreen = false;
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if (forceFail || (bShouldRetry && bCanRetry))
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{
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float LockoutPeriod = GetLockoutPeriodSeconds(HttpRetryRequestEntry);
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if (LockoutPeriod > 0.0f)
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{
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UE_LOG(LogHttp, Warning, TEXT("Lockout of %fs on %s"), LockoutPeriod, *(HttpRetryRequest->GetURL()));
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}
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HttpRetryRequestEntry.LockoutEndTimeAbsoluteSeconds = NowAbsoluteSeconds + LockoutPeriod;
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::ProcessingLockout;
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HttpRetryRequest->OnRequestWillRetry().ExecuteIfBound(HttpRetryRequest, HttpRetryRequest->GetResponse(), LockoutPeriod);
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}
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else
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{
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UE_LOG(LogHttp, Warning, TEXT("Retry exhausted on %s"), *(HttpRetryRequest->GetURL()));
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if (FailedCount != nullptr)
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{
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++(*FailedCount);
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}
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::FailedRetry;
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}
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}
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else if (RequestStatus == EHttpRequestStatus::Succeeded)
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{
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if (HttpRetryRequestEntry.CurrentRetryCount > 0)
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{
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UE_LOG(LogHttp, Warning, TEXT("Success on %s"), *(HttpRetryRequest->GetURL()));
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}
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if (CompletedCount != nullptr)
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{
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++(*CompletedCount);
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}
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::Succeeded;
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}
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}
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if (HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::ProcessingLockout)
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{
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if (NowAbsoluteSeconds >= HttpRetryRequestEntry.LockoutEndTimeAbsoluteSeconds)
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{
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// if this fails the HttpRequest's state will be failed which will cause the retry logic to kick(as expected)
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bool success = HttpRetryRequest->HttpRequest->ProcessRequest();
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if (success)
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{
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UE_LOG(LogHttp, Warning, TEXT("Retry %d on %s"), HttpRetryRequestEntry.CurrentRetryCount + 1, *(HttpRetryRequest->GetURL()));
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++HttpRetryRequestEntry.CurrentRetryCount;
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HttpRetryRequest->Status = FRequest::EStatus::Processing;
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}
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}
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if (FailingCount != nullptr)
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{
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++(*FailingCount);
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}
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}
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}
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else
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{
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UE_LOG(LogHttp, Warning, TEXT("Timeout on retry %d: %s"), HttpRetryRequestEntry.CurrentRetryCount + 1, *(HttpRetryRequest->GetURL()));
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bIsGreen = false;
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HttpRetryRequest->Status = FHttpRetrySystem::FRequest::EStatus::FailedTimeout;
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if (FailedCount != nullptr)
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{
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++(*FailedCount);
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}
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}
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}
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bool bWasCompleted = false;
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bool bWasSuccessful = false;
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if (HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::Cancelled ||
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HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::FailedRetry ||
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HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::FailedTimeout ||
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HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::Succeeded)
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{
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bWasCompleted = true;
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bWasSuccessful = HttpRetryRequest->Status == FHttpRetrySystem::FRequest::EStatus::Succeeded;
|
|
}
|
|
|
|
if (bWasCompleted)
|
|
{
|
|
if (bWasSuccessful)
|
|
{
|
|
HttpRetryRequest->BroadcastResponseHeadersReceived();
|
|
}
|
|
HttpRetryRequest->OnProcessRequestComplete().ExecuteIfBound(HttpRetryRequest, HttpRetryRequest->GetResponse(), bWasSuccessful);
|
|
}
|
|
|
|
if(bWasSuccessful)
|
|
{
|
|
if(CompletedCount != nullptr)
|
|
{
|
|
++(*CompletedCount);
|
|
}
|
|
}
|
|
|
|
if (bWasCompleted)
|
|
{
|
|
RequestList.RemoveAtSwap(index);
|
|
}
|
|
else
|
|
{
|
|
++index;
|
|
}
|
|
}
|
|
|
|
return bIsGreen;
|
|
}
|
|
|
|
FHttpRetrySystem::FManager::FHttpRetryRequestEntry::FHttpRetryRequestEntry(TSharedRef<FHttpRetrySystem::FRequest>& InRequest)
|
|
: bShouldCancel(false)
|
|
, CurrentRetryCount(0)
|
|
, RequestStartTimeAbsoluteSeconds(FPlatformTime::Seconds())
|
|
, Request(InRequest)
|
|
{}
|
|
|
|
bool FHttpRetrySystem::FManager::ProcessRequest(TSharedRef<FHttpRetrySystem::FRequest>& HttpRetryRequest)
|
|
{
|
|
QUICK_SCOPE_CYCLE_COUNTER(STAT_FHttpRetrySystem_FManager_ProcessRequest);
|
|
|
|
bool bResult = HttpRetryRequest->HttpRequest->ProcessRequest();
|
|
|
|
if (bResult)
|
|
{
|
|
RequestList.Add(FHttpRetryRequestEntry(HttpRetryRequest));
|
|
}
|
|
|
|
return bResult;
|
|
}
|
|
|
|
void FHttpRetrySystem::FManager::CancelRequest(TSharedRef<FHttpRetrySystem::FRequest>& HttpRetryRequest)
|
|
{
|
|
QUICK_SCOPE_CYCLE_COUNTER(STAT_FHttpRetrySystem_FManager_CancelRequest);
|
|
|
|
// Find the existing request entry if is was previously processed.
|
|
bool bFound = false;
|
|
for (int32 i = 0; i < RequestList.Num(); ++i)
|
|
{
|
|
FHttpRetryRequestEntry& EntryRef = RequestList[i];
|
|
|
|
if (EntryRef.Request == HttpRetryRequest)
|
|
{
|
|
EntryRef.bShouldCancel = true;
|
|
bFound = true;
|
|
}
|
|
}
|
|
// If we did not find the entry, likely auth failed for the request, in which case ProcessRequest does not get called.
|
|
// Adding it to the list and flagging as cancel will process it on next tick.
|
|
if (!bFound)
|
|
{
|
|
FHttpRetryRequestEntry RetryRequestEntry(HttpRetryRequest);
|
|
RetryRequestEntry.bShouldCancel = true;
|
|
RequestList.Add(RetryRequestEntry);
|
|
}
|
|
HttpRetryRequest->HttpRequest->CancelRequest();
|
|
}
|
|
|
|
/* This should only be used when shutting down or suspending, to make sure
|
|
all pending HTTP requests are flushed to the network */
|
|
void FHttpRetrySystem::FManager::BlockUntilFlushed(float InTimeoutSec)
|
|
{
|
|
const float SleepInterval = 0.016;
|
|
float TimeElapsed = 0.0f;
|
|
uint32 FileCount, FailingCount, FailedCount, CompleteCount;
|
|
while (RequestList.Num() > 0 && TimeElapsed < InTimeoutSec)
|
|
{
|
|
FHttpModule::Get().GetHttpManager().Tick(SleepInterval);
|
|
Update(&FileCount, &FailingCount, &FailedCount, &CompleteCount);
|
|
FPlatformProcess::Sleep(SleepInterval);
|
|
TimeElapsed += SleepInterval;
|
|
}
|
|
} |