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#include "fast.h"
#include "random.h"
#include "entropy.h"
#include "mersenne.h"
#include "shuffle.h"
#include "init_atfork.h"
#include <util/stream/output.h>
#include <util/stream/mem.h>
#include <util/stream/zlib.h>
#include <util/stream/buffer.h>
#include <util/system/fs.h>
#include <util/system/info.h>
#include <util/system/spinlock.h>
#include <util/system/thread.h>
#include <util/system/execpath.h>
#include <util/system/datetime.h>
#include <util/system/hostname.h>
#include <util/system/getpid.h>
#include <util/system/mem_info.h>
#include <util/system/rusage.h>
#include <util/system/cpu_id.h>
#include <util/system/unaligned_mem.h>
#include <util/generic/buffer.h>
#include <util/generic/singleton.h>
#include <util/digest/murmur.h>
#include <util/digest/city.h>
#include <util/ysaveload.h>
namespace {
inline void Permute(char* buf, size_t len, ui32 seed) noexcept {
Shuffle(buf, buf + len, TReallyFastRng32(seed));
}
struct THostEntropy: public TBuffer {
inline THostEntropy() {
{
TBufferOutput buf(*this);
TZLibCompress out(&buf);
Save(&out, GetPID());
Save(&out, GetCycleCount());
Save(&out, MicroSeconds());
Save(&out, TThread::CurrentThreadId());
Save(&out, NSystemInfo::CachedNumberOfCpus());
Save(&out, NSystemInfo::TotalMemorySize());
Save(&out, HostName());
try {
Save(&out, GetExecPath());
} catch (...) {
// workaround - sometimes fails on FreeBSD
}
Save(&out, (size_t)Data());
Save(&out, (size_t)&buf);
{
double la[3];
NSystemInfo::LoadAverage(la, Y_ARRAY_SIZE(la));
out.Write(la, sizeof(la));
}
{
auto mi = NMemInfo::GetMemInfo();
out.Write(&mi, sizeof(mi));
}
{
auto ru = TRusage::Get();
out.Write(&ru, sizeof(ru));
}
{
ui32 store[12];
out << TStringBuf(CpuBrand(store));
}
out << NFs::CurrentWorkingDirectory();
out.Finish();
}
{
TMemoryOutput out(Data(), Size());
// replace zlib header with hash
Save(&out, CityHash64(Data(), Size()));
}
Permute(Data(), Size(), MurmurHash<ui32>(Data(), Size()));
}
};
// not thread-safe
class TMersenneInput: public IInputStream {
using TKey = ui64;
using TRnd = TMersenne<TKey>;
public:
inline explicit TMersenneInput(const TBuffer& rnd)
: Rnd_((const TKey*)rnd.Data(), rnd.Size() / sizeof(TKey))
{
}
~TMersenneInput() override = default;
size_t DoRead(void* buf, size_t len) override {
size_t toRead = len;
while (toRead) {
const TKey next = Rnd_.GenRand();
const size_t toCopy = Min(toRead, sizeof(next));
memcpy(buf, &next, toCopy);
buf = (char*)buf + toCopy;
toRead -= toCopy;
}
return len;
}
private:
TRnd Rnd_;
};
class TEntropyPoolStream: public IInputStream {
public:
inline explicit TEntropyPoolStream(const TBuffer& buffer)
: Mi_(buffer)
, Bi_(&Mi_, 8192)
{
}
size_t DoRead(void* buf, size_t len) override {
auto guard = Guard(Mutex_);
return Bi_.Read(buf, len);
}
private:
TAdaptiveLock Mutex_;
TMersenneInput Mi_;
TBufferedInput Bi_;
};
struct TSeedStream: public IInputStream {
size_t DoRead(void* inbuf, size_t len) override {
char* buf = (char*)inbuf;
#define DO_STEP(type) \
while (len >= sizeof(type)) { \
WriteUnaligned<type>(buf, RandomNumber<type>()); \
buf += sizeof(type); \
len -= sizeof(type); \
}
DO_STEP(ui64);
DO_STEP(ui32);
DO_STEP(ui16);
DO_STEP(ui8);
#undef DO_STEP
return buf - (char*)inbuf;
}
};
struct TDefaultTraits {
THolder<TEntropyPoolStream> EP;
TSeedStream SS;
inline TDefaultTraits() {
Reset();
}
inline IInputStream& EntropyPool() noexcept {
return *EP;
}
inline IInputStream& Seed() noexcept {
return SS;
}
inline void Reset() noexcept {
EP.Reset(new TEntropyPoolStream(THostEntropy()));
}
static inline TDefaultTraits& Instance() {
auto res = SingletonWithPriority<TDefaultTraits, 0>();
RNGInitAtForkHandlers();
return *res;
}
};
using TRandomTraits = TDefaultTraits;
} // namespace
IInputStream& EntropyPool() {
return TRandomTraits::Instance().EntropyPool();
}
IInputStream& Seed() {
return TRandomTraits::Instance().Seed();
}
void ResetEntropyPool() {
TRandomTraits::Instance().Reset();
}
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