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#pragma once
#include <library/cpp/actors/core/event_load.h>
#include <library/cpp/actors/util/rc_buf.h>
#include <library/cpp/containers/stack_vector/stack_vec.h>
#include <deque>
namespace NInterconnect {
template<size_t TotalSize>
class TOutgoingStreamT {
static constexpr size_t BufferSize = TotalSize - sizeof(ui32) * 2;
struct TBuffer {
char Data[BufferSize];
ui32 RefCount;
ui32 Index;
struct TDeleter {
void operator ()(TBuffer *buffer) const {
free(buffer);
}
};
};
static_assert(sizeof(TBuffer) == TotalSize);
struct TSendChunk {
TContiguousSpan Span;
TBuffer *Buffer;
};
std::vector<std::unique_ptr<TBuffer, typename TBuffer::TDeleter>> Buffers;
TBuffer *AppendBuffer = nullptr;
size_t AppendOffset = BufferSize; // into the last buffer
std::deque<TSendChunk> SendQueue;
size_t SendQueuePos = 0;
size_t SendOffset = 0;
public:
size_t CalculateOutgoingSize() const {
size_t res = 0;
for (const TSendChunk& chunk : SendQueue) {
res += chunk.Span.size();
}
return res;
}
size_t CalculateUnsentSize() const {
size_t res = 0;
for (auto it = SendQueue.begin() + SendQueuePos; it != SendQueue.end(); ++it) {
res += it->Span.size();
}
return res - SendOffset;
}
TMutableContiguousSpan AcquireSpanForWriting(size_t maxLen) {
if (AppendOffset == BufferSize) { // we have no free buffer, allocate one
Buffers.emplace_back(static_cast<TBuffer*>(malloc(sizeof(TBuffer))));
AppendBuffer = Buffers.back().get();
Y_VERIFY(AppendBuffer);
AppendBuffer->RefCount = 1; // through AppendBuffer pointer
AppendBuffer->Index = Buffers.size() - 1;
AppendOffset = 0;
}
return {AppendBuffer->Data + AppendOffset, Min(maxLen, BufferSize - AppendOffset)};
}
void Append(TContiguousSpan span) {
TBuffer *buffer = nullptr;
if (AppendBuffer && span.data() == AppendBuffer->Data + AppendOffset) { // the only valid case to use previously acquired span
buffer = AppendBuffer;
AppendOffset += span.size();
Y_VERIFY_DEBUG(AppendOffset <= BufferSize);
if (AppendOffset != BufferSize) {
++buffer->RefCount;
}
} else {
#ifndef NDEBUG
// ensure this span does not point into any existing buffer part
const char *begin = span.data();
const char *end = span.data() + span.size();
for (const auto& buffer : Buffers) {
const char *bufferBegin = buffer->Data;
const char *bufferEnd = bufferBegin + BufferSize;
if (bufferBegin < end && begin < bufferEnd) {
Y_FAIL();
}
}
#endif
}
if (!SendQueue.empty()) {
auto& back = SendQueue.back();
if (back.Span.data() + back.Span.size() == span.data()) { // check if it is possible just to extend the last span
if (SendQueuePos == SendQueue.size()) {
--SendQueuePos;
SendOffset = back.Span.size();
}
back.Span = {back.Span.data(), back.Span.size() + span.size()};
DropBufferReference(buffer);
return;
}
}
if (buffer) {
++buffer->RefCount;
}
SendQueue.push_back(TSendChunk{span, buffer});
DropBufferReference(buffer);
}
void Write(TContiguousSpan in) {
while (in.size()) {
auto outChunk = AcquireSpanForWriting(in.size());
Append(outChunk);
memcpy(outChunk.data(), in.data(), outChunk.size());
in = in.SubSpan(outChunk.size(), Max<size_t>());
}
}
using TBookmark = TStackVec<TMutableContiguousSpan, 2>;
TBookmark Bookmark(size_t len) {
TBookmark bookmark;
while (len) {
const auto span = AcquireSpanForWriting(len);
Append(span);
bookmark.push_back(span);
len -= span.size();
}
return bookmark;
}
void WriteBookmark(TBookmark&& bookmark, TContiguousSpan in) {
for (auto& outChunk : bookmark) {
Y_VERIFY(outChunk.size() <= in.size());
memcpy(outChunk.data(), in.data(), outChunk.size());
in = in.SubSpan(outChunk.size(), Max<size_t>());
}
}
void Rewind() {
SendQueuePos = 0;
SendOffset = 0;
}
template<typename T>
void ProduceIoVec(T& container, size_t maxItems) {
size_t offset = SendOffset;
for (auto it = SendQueue.begin() + SendQueuePos; it != SendQueue.end() && std::size(container) < maxItems; ++it) {
const TContiguousSpan span = it->Span.SubSpan(offset, Max<size_t>());
container.push_back(NActors::TConstIoVec{span.data(), span.size()});
offset = 0;
}
}
void Advance(size_t numBytes) { // called when numBytes portion of data has been sent
Y_VERIFY_DEBUG(numBytes == 0 || SendQueuePos != SendQueue.size());
SendOffset += numBytes;
for (auto it = SendQueue.begin() + SendQueuePos; SendOffset && it->Span.size() <= SendOffset; ++SendQueuePos, ++it) {
SendOffset -= it->Span.size();
Y_VERIFY_DEBUG(SendOffset == 0 || SendQueuePos != SendQueue.size() - 1);
}
}
void DropFront(size_t numBytes) { // drops first numBytes from the queue, freeing buffers when necessary
while (numBytes) {
Y_VERIFY_DEBUG(!SendQueue.empty());
auto& front = SendQueue.front();
if (numBytes < front.Span.size()) {
front.Span = front.Span.SubSpan(numBytes, Max<size_t>());
if (SendQueuePos == 0) {
Y_VERIFY_DEBUG(numBytes <= SendOffset);
SendOffset -= numBytes;
}
break;
} else {
numBytes -= front.Span.size();
}
Y_VERIFY_DEBUG(!front.Buffer || (front.Span.data() >= front.Buffer->Data &&
front.Span.data() + front.Span.size() <= front.Buffer->Data + BufferSize));
DropBufferReference(front.Buffer);
SendQueue.pop_front();
if (SendQueuePos) {
--SendQueuePos;
} else {
SendOffset = 0;
}
}
}
template<typename T>
void ScanLastBytes(size_t numBytes, T&& callback) const {
auto it = SendQueue.end();
ssize_t offset = -numBytes;
while (offset < 0) {
Y_VERIFY_DEBUG(it != SendQueue.begin());
const TSendChunk& chunk = *--it;
offset += chunk.Span.size();
}
for (; it != SendQueue.end(); ++it, offset = 0) {
callback(it->Span.SubSpan(offset, Max<size_t>()));
}
}
private:
void DropBufferReference(TBuffer *buffer) {
if (buffer && !--buffer->RefCount) {
const size_t index = buffer->Index;
auto& cell = Buffers[index];
Y_VERIFY_DEBUG(cell.get() == buffer);
std::swap(cell, Buffers.back());
cell->Index = index;
Buffers.pop_back();
}
}
};
using TOutgoingStream = TOutgoingStreamT<262144>;
} // NInterconnect
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