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#pragma once
#include <library/cpp/monlib/encode/format.h>
#include <util/string/ascii.h>
#include <util/generic/yexception.h>
#include <util/generic/typetraits.h>
namespace NMonitoring {
namespace NPrivate {
Y_HAS_MEMBER(Name, Name);
Y_HAS_MEMBER(second, Second);
} // namespace NPrivate
template <typename TRequest>
ECompression ParseCompression(const TRequest& req) {
auto&& headers = req.GetHeaders();
constexpr auto isPlainPair = NPrivate::THasSecond<std::decay_t<decltype(*headers.begin())>>::value;
auto it = FindIf(std::begin(headers), std::end(headers),
[=] (const auto& h) {
if constexpr (NPrivate::THasName<std::decay_t<decltype(h)>>::value) {
return AsciiEqualsIgnoreCase(h.Name(), TStringBuf("accept-encoding"));
} else if constexpr (isPlainPair) {
return AsciiEqualsIgnoreCase(h.first, TStringBuf("accept-encoding"));
} else {
static_assert(TDependentFalse<decltype(h)>);
}
});
if (it == std::end(headers)) {
return NMonitoring::ECompression::IDENTITY;
}
NMonitoring::ECompression val{};
if constexpr (isPlainPair) {
val = CompressionFromAcceptEncodingHeader(it->second);
} else {
val = CompressionFromAcceptEncodingHeader(it->Value());
}
return val != NMonitoring::ECompression::UNKNOWN
? val
: NMonitoring::ECompression::IDENTITY;
}
template <typename TRequest>
NMonitoring::EFormat ParseFormat(const TRequest& req) {
auto&& formatStr = req.GetParams()
.Get(TStringBuf("format"));
if (!formatStr.empty()) {
if (formatStr == TStringBuf("SPACK")) {
return EFormat::SPACK;
} else if (formatStr == TStringBuf("TEXT")) {
return EFormat::TEXT;
} else if (formatStr == TStringBuf("JSON")) {
return EFormat::JSON;
} else {
ythrow yexception() << "unknown format: " << formatStr << ". Only spack is supported here";
}
}
auto&& headers = req.GetHeaders();
constexpr auto isPlainPair = NPrivate::THasSecond<std::decay_t<decltype(*headers.begin())>>::value;
auto it = FindIf(std::begin(headers), std::end(headers),
[=] (const auto& h) {
if constexpr (NPrivate::THasName<std::decay_t<decltype(h)>>::value) {
return AsciiEqualsIgnoreCase(h.Name(), TStringBuf("accept"));
} else if constexpr (isPlainPair) {
return AsciiEqualsIgnoreCase(h.first, TStringBuf("accept"));
} else {
static_assert(TDependentFalse<decltype(h)>);
}
});
if (it != std::end(headers)) {
if constexpr (isPlainPair) {
return FormatFromAcceptHeader(it->second);
} else {
return FormatFromAcceptHeader(it->Value());
}
}
return EFormat::UNKNOWN;
}
} // namespace NMonitoring
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