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#include "fetch.h"
#include <yql/essentials/utils/log/log.h>
#include <library/cpp/openssl/io/stream.h>
#include <library/cpp/http/misc/httpcodes.h>
#include <library/cpp/charset/ci_string.h>
#include <util/network/socket.h>
#include <util/string/cast.h>
#include <util/generic/strbuf.h>
namespace NYql {
namespace {
THttpURL ParseURL(const TStringBuf addr, NUri::TParseFlags features) {
THttpURL url;
THttpURL::TParsedState parsedState = url.Parse(addr, features, nullptr, 65536);
if (THttpURL::ParsedOK != parsedState) {
ythrow yexception() << "Bad URL: \"" << addr << "\", " << HttpURLParsedStateToString(parsedState);
}
return url;
}
class TFetchResultImpl: public IFetchResult {
public:
TFetchResultImpl(const THttpURL& url, const THttpHeaders& additionalHeaders, TDuration timeout) {
TString host = url.Get(THttpURL::FieldHost);
TString path = url.PrintS(THttpURL::FlagPath | THttpURL::FlagQuery);
const char* p = url.Get(THttpURL::FieldPort);
ui16 port = 80;
bool https = false;
if (url.Get(THttpURL::FieldScheme) == TStringBuf("https")) {
port = 443;
https = true;
}
if (p) {
port = FromString<ui16>(p);
}
TString req;
{
TStringOutput rqs(req);
TStringBuf userAgent = "User-Agent: Mozilla/5.0 (compatible; YQL/1.0)";
IOutputStream::TPart request[] = {
IOutputStream::TPart("GET ", 4),
IOutputStream::TPart(path.data(), path.size()),
IOutputStream::TPart(" HTTP/1.1", 9),
IOutputStream::TPart::CrLf(),
IOutputStream::TPart("Host: ", 6),
IOutputStream::TPart(host.data(), host.size()),
IOutputStream::TPart::CrLf(),
IOutputStream::TPart(userAgent.data(), userAgent.size()),
IOutputStream::TPart::CrLf(),
};
rqs.Write(request, Y_ARRAY_SIZE(request));
if (!additionalHeaders.Empty()) {
additionalHeaders.OutTo(&rqs);
}
rqs << "\r\n";
}
Socket_.Reset(new TSocket(TNetworkAddress(host, port), timeout));
SocketInput_.Reset(new TSocketInput(*Socket_));
SocketOutput_.Reset(new TSocketOutput(*Socket_));
Socket_->SetSocketTimeout(timeout.Seconds(), timeout.MilliSeconds() % 1000);
if (https) {
Ssl_.Reset(new TOpenSslClientIO(SocketInput_.Get(), SocketOutput_.Get()));
}
{
THttpOutput ho(Ssl_ ? (IOutputStream*)Ssl_.Get() : (IOutputStream*)SocketOutput_.Get());
(ho << req).Finish();
}
HttpInput_.Reset(new THttpInput(Ssl_ ? (IInputStream*)Ssl_.Get() : (IInputStream*)SocketInput_.Get()));
}
THttpInput& GetStream() override {
return *HttpInput_;
}
unsigned GetRetCode() override {
return ParseHttpRetCode(HttpInput_->FirstLine());
}
THttpURL GetRedirectURL(const THttpURL& baseUrl) override {
for (auto i = HttpInput_->Headers().Begin(); i != HttpInput_->Headers().End(); ++i) {
if (0 == TCiString::compare(i->Name(), TStringBuf("location"))) {
THttpURL target = ParseURL(i->Value(), THttpURL::FeaturesAll | NUri::TFeature::FeatureConvertHostIDN);
if (!target.IsValidAbs()) {
target.Merge(baseUrl);
}
return target;
}
}
ythrow yexception() << "Unknown redirect location from " << baseUrl.PrintS();
}
static TFetchResultPtr Fetch(const THttpURL& url, const THttpHeaders& additionalHeaders, const TDuration& timeout) {
return new TFetchResultImpl(url, additionalHeaders, timeout);
}
private:
THolder<TSocket> Socket_;
THolder<TSocketInput> SocketInput_;
THolder<TSocketOutput> SocketOutput_;
THolder<TOpenSslClientIO> Ssl_;
THolder<THttpInput> HttpInput_;
};
inline bool IsRedirectCode(unsigned code) {
switch (code) {
case HTTP_MOVED_PERMANENTLY:
case HTTP_FOUND:
case HTTP_SEE_OTHER:
case HTTP_TEMPORARY_REDIRECT:
return true;
}
return false;
}
} // unnamed
ERetryErrorClass DefaultClassifyHttpCode(unsigned code) {
switch (code) {
case HTTP_REQUEST_TIME_OUT: //408
case HTTP_AUTHENTICATION_TIMEOUT: //419
return ERetryErrorClass::ShortRetry;
case HTTP_TOO_MANY_REQUESTS: //429
case HTTP_SERVICE_UNAVAILABLE: //503
return ERetryErrorClass::LongRetry;
default:
return IsServerError(code)
? ERetryErrorClass::ShortRetry //5xx
: ERetryErrorClass::NoRetry;
}
}
IRetryPolicy<unsigned>::TPtr GetDefaultPolicy() {
static const auto policy = IRetryPolicy<unsigned>::GetExponentialBackoffPolicy(
/*retryClassFunction=*/DefaultClassifyHttpCode,
/*minDelay=*/TDuration::Seconds(1),
/*minLongRetryDelay:*/TDuration::Seconds(5),
/*maxDelay=*/TDuration::Minutes(1),
/*maxRetries=*/3,
/*maxTime=*/TDuration::Minutes(3),
/*scaleFactor=*/2
);
return policy;
}
THttpURL ParseURL(const TStringBuf addr) {
return ParseURL(addr, THttpURL::FeaturesAll | NUri::TFeature::FeatureConvertHostIDN | NUri::TFeature::FeatureNoRelPath);
}
TFetchResultPtr Fetch(const THttpURL& url, const THttpHeaders& additionalHeaders, const TDuration& timeout, size_t redirects, const IRetryPolicy<unsigned>::TPtr& policy) {
const auto& actualPolicy = policy ? policy : GetDefaultPolicy();
THttpURL currentUrl = url;
for (size_t fetchNum = 0; fetchNum < redirects; ++fetchNum) {
IRetryPolicy<unsigned>::IRetryState::TPtr state = actualPolicy->CreateRetryState();
unsigned responseCode = 0;
TFetchResultPtr fr;
while (true) {
std::exception_ptr eptr;
try {
fr = TFetchResultImpl::Fetch(currentUrl, additionalHeaders, timeout);
responseCode = fr->GetRetCode();
} catch (const TSystemError& ex) {
if (ex.Status() != ETIMEDOUT) {
throw;
}
responseCode = HTTP_REQUEST_TIME_OUT;
eptr = std::current_exception();
}
if (auto delay = state->GetNextRetryDelay(responseCode)) {
YQL_LOG(DEBUG) << "Connection failed. Retry delay: " << *delay;
Sleep(*delay);
} else if (eptr != nullptr) {
std::rethrow_exception(eptr);
} else {
break;
}
}
if (responseCode >= 200 && responseCode < 300) {
return fr;
}
if (responseCode == HTTP_NOT_MODIFIED) {
return fr;
}
if (IsRedirectCode(responseCode)) {
currentUrl = fr->GetRedirectURL(currentUrl);
YQL_LOG(INFO) << "Got redirect to " << currentUrl.PrintS();
continue;
}
TString errorBody;
try {
errorBody = fr->GetStream().ReadAll();
} catch (...) {
}
ythrow yexception() << "Failed to fetch url '" << currentUrl.PrintS() << "' with code " << responseCode << ", body: " << errorBody;
}
ythrow yexception() << "Failed to fetch url '" << currentUrl.PrintS() << "': too many redirects";
}
} // NYql
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