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#pragma once
#include "retry_policy.h"
#include "utils.h"
#include <library/cpp/retry/protos/retry_options.pb.h>
#include <util/datetime/base.h>
#include <util/generic/maybe.h>
#include <util/generic/typetraits.h>
#include <util/generic/yexception.h>
#include <functional>
struct TRetryOptions {
ui32 RetryCount;
// TotalDuration = SleepDuration +/- SleepRandomDelta + (attempt * SleepIncrement) + (2**attempt * SleepExponentialMultiplier)
TDuration SleepDuration;
TDuration SleepRandomDelta;
TDuration SleepIncrement;
TDuration SleepExponentialMultiplier;
std::function<void(TDuration)> SleepFunction;
TRetryOptions(ui32 retryCount = 3, TDuration sleepDuration = TDuration::Seconds(1), TDuration sleepRandomDelta = TDuration::Zero(),
TDuration sleepIncrement = TDuration::Zero(), TDuration sleepExponentialMultiplier = TDuration::Zero(),
std::function<void(TDuration)> sleepFunction = [](TDuration d) { Sleep(d); }) // can't use Sleep itself due to Win compilation error
: RetryCount(retryCount)
, SleepDuration(sleepDuration)
, SleepRandomDelta(sleepRandomDelta)
, SleepIncrement(sleepIncrement)
, SleepExponentialMultiplier(sleepExponentialMultiplier)
, SleepFunction(sleepFunction)
{
}
TRetryOptions& WithCount(ui32 retryCount) {
RetryCount = retryCount;
return *this;
}
TRetryOptions& WithSleep(TDuration sleepDuration) {
SleepDuration = sleepDuration;
return *this;
}
TRetryOptions& WithRandomDelta(TDuration sleepRandomDelta) {
SleepRandomDelta = sleepRandomDelta;
return *this;
}
TRetryOptions& WithIncrement(TDuration sleepIncrement) {
SleepIncrement = sleepIncrement;
return *this;
}
TRetryOptions& WithExponentialMultiplier(TDuration sleepExponentialMultiplier) {
SleepExponentialMultiplier = sleepExponentialMultiplier;
return *this;
}
TRetryOptions& WithSleepFunction(std::function<void(TDuration)> sleepFunction) {
SleepFunction = sleepFunction;
return *this;
}
// for compatibility attempt == 0 by default
TDuration GetTimeToSleep(ui32 attempt = 0) const {
return SleepDuration + NRetryPrivate::AddRandomDelta(SleepRandomDelta) + NRetryPrivate::AddIncrement(attempt, SleepIncrement) + NRetryPrivate::AddExponentialMultiplier(attempt, SleepExponentialMultiplier);
}
static TRetryOptions Count(ui32 retryCount) {
return TRetryOptions(retryCount);
}
static TRetryOptions Default() {
return TRetryOptions();
}
static TRetryOptions NoRetry() {
return TRetryOptions(0);
}
};
TRetryOptions MakeRetryOptions(const NRetry::TRetryOptionsPB& retryOptions);
namespace NRetryDetails {
template <class TException>
class TRetryOptionsPolicy : public IRetryPolicy<const TException&> {
public:
explicit TRetryOptionsPolicy(const TRetryOptions& opts)
: Opts(opts)
{
}
using IRetryState = typename IRetryPolicy<const TException&>::IRetryState;
class TRetryState : public IRetryState {
public:
explicit TRetryState(const TRetryOptions& opts)
: Opts(opts)
{
}
TMaybe<TDuration> GetNextRetryDelay(const TException&) override {
if (Attempt == Opts.RetryCount) {
return Nothing();
}
return Opts.GetTimeToSleep(Attempt++);
}
private:
const TRetryOptions Opts;
size_t Attempt = 0;
};
typename IRetryState::TPtr CreateRetryState() const override {
return std::make_unique<TRetryState>(Opts);
}
private:
const TRetryOptions Opts;
};
} // namespace NRetryDetails
template <class TException>
typename IRetryPolicy<const TException&>::TPtr MakeRetryPolicy(const TRetryOptions& opts) {
return std::make_shared<NRetryDetails::TRetryOptionsPolicy<TException>>(opts);
}
template <class TException>
typename IRetryPolicy<const TException&>::TPtr MakeRetryPolicy(const NRetry::TRetryOptionsPB& opts) {
return MakeRetryPolicy<TException>(MakeRetryOptions(opts));
}
template <typename TResult, typename TException = yexception>
TMaybe<TResult> DoWithRetry(std::function<TResult()> func, const typename IRetryPolicy<const TException&>::TPtr& retryPolicy, bool throwLast = true, std::function<void(const TException&)> onFail = {}, std::function<void(TDuration)> sleepFunction = {}) {
typename IRetryPolicy<const TException&>::IRetryState::TPtr retryState;
while (true) {
try {
return func();
} catch (const TException& ex) {
if (onFail) {
onFail(ex);
}
if (!retryState) {
retryState = retryPolicy->CreateRetryState();
}
if (const TMaybe<TDuration> delay = retryState->GetNextRetryDelay(ex)) {
if (*delay) {
if (sleepFunction) {
sleepFunction(*delay);
} else {
Sleep(*delay);
}
}
} else {
if (throwLast) {
throw;
}
break;
}
}
}
return Nothing();
}
template <typename TResult, typename TException = yexception>
TMaybe<TResult> DoWithRetry(std::function<TResult()> func, std::function<void(const TException&)> onFail, TRetryOptions retryOptions, bool throwLast = true) {
return DoWithRetry<TResult, TException>(std::move(func), MakeRetryPolicy<TException>(retryOptions), throwLast, std::move(onFail), retryOptions.SleepFunction);
}
template <typename TResult, typename TException = yexception>
TMaybe<TResult> DoWithRetry(std::function<TResult()> func, TRetryOptions retryOptions, bool throwLast = true) {
return DoWithRetry<TResult, TException>(std::move(func), MakeRetryPolicy<TException>(retryOptions), throwLast, {}, retryOptions.SleepFunction);
}
template <typename TException = yexception>
bool DoWithRetry(std::function<void()> func, const typename IRetryPolicy<const TException&>::TPtr& retryPolicy, bool throwLast = true, std::function<void(const TException&)> onFail = {}, std::function<void(TDuration)> sleepFunction = {}) {
auto f = [&]() {
func();
return nullptr;
};
return DoWithRetry<void*, TException>(f, retryPolicy, throwLast, std::move(onFail), std::move(sleepFunction)).Defined();
}
template <typename TException = yexception>
bool DoWithRetry(std::function<void()> func, std::function<void(const TException&)> onFail, TRetryOptions retryOptions, bool throwLast) {
return DoWithRetry<TException>(std::move(func), MakeRetryPolicy<TException>(retryOptions), throwLast, onFail, retryOptions.SleepFunction);
}
template <typename TException = yexception>
bool DoWithRetry(std::function<void()> func, TRetryOptions retryOptions, bool throwLast = true) {
return DoWithRetry<TException>(std::move(func), MakeRetryPolicy<TException>(retryOptions), throwLast, {}, retryOptions.SleepFunction);
}
template <class TRetCode>
TRetCode DoWithRetryOnRetCode(std::function<TRetCode()> func, const typename IRetryPolicy<TRetCode>::TPtr& retryPolicy, std::function<void(TDuration)> sleepFunction = {}) {
auto retryState = retryPolicy->CreateRetryState();
while (true) {
TRetCode code = func();
if (const TMaybe<TDuration> delay = retryState->GetNextRetryDelay(code)) {
if (*delay) {
if (sleepFunction) {
sleepFunction(*delay);
} else {
Sleep(*delay);
}
}
} else {
return code;
}
}
}
bool DoWithRetryOnRetCode(std::function<bool()> func, TRetryOptions retryOptions);
Y_DECLARE_PODTYPE(TRetryOptions);
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