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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file LICENSE.rst or https://cmake.org/licensing for details. */
#pragma once
#include <cassert>
#include <functional>
#include <istream>
#include <cm/memory>
#include <cm3p/uv.h>
#include "cmUVHandlePtr.h"
#include "cmUVStreambuf.h"
template <typename CharT, typename Traits = std::char_traits<CharT>>
class cmBasicUVIStream : public std::basic_istream<CharT>
{
public:
cmBasicUVIStream();
cmBasicUVIStream(uv_stream_t* stream);
bool is_open() const;
void open(uv_stream_t* stream);
void close();
private:
cmBasicUVStreambuf<CharT, Traits> Buffer;
};
template <typename CharT, typename Traits>
cmBasicUVIStream<CharT, Traits>::cmBasicUVIStream()
: std::basic_istream<CharT, Traits>(&this->Buffer)
{
}
template <typename CharT, typename Traits>
cmBasicUVIStream<CharT, Traits>::cmBasicUVIStream(uv_stream_t* stream)
: std::basic_istream<CharT, Traits>(&this->Buffer)
{
this->open(stream);
}
template <typename CharT, typename Traits>
bool cmBasicUVIStream<CharT, Traits>::is_open() const
{
return this->Buffer.is_open();
}
template <typename CharT, typename Traits>
void cmBasicUVIStream<CharT, Traits>::open(uv_stream_t* stream)
{
this->Buffer.open(stream);
}
template <typename CharT, typename Traits>
void cmBasicUVIStream<CharT, Traits>::close()
{
this->Buffer.close();
}
using cmUVIStream = cmBasicUVIStream<char>;
class cmUVStreamReadHandle
{
private:
std::vector<char> Buffer;
std::function<void(std::vector<char>)> OnRead;
std::function<void()> OnFinish;
template <typename ReadCallback, typename FinishCallback>
friend std::unique_ptr<cmUVStreamReadHandle> cmUVStreamRead(
uv_stream_t* stream, ReadCallback onRead, FinishCallback onFinish);
};
template <typename ReadCallback, typename FinishCallback>
std::unique_ptr<cmUVStreamReadHandle> cmUVStreamRead(uv_stream_t* stream,
ReadCallback onRead,
FinishCallback onFinish)
{
auto handle = cm::make_unique<cmUVStreamReadHandle>();
handle->OnRead = std::move(onRead);
handle->OnFinish = std::move(onFinish);
stream->data = handle.get();
uv_read_start(
stream,
[](uv_handle_t* s, std::size_t suggestedSize, uv_buf_t* buffer) {
auto* data = static_cast<cmUVStreamReadHandle*>(s->data);
data->Buffer.resize(suggestedSize);
buffer->base = data->Buffer.data();
buffer->len = suggestedSize;
},
[](uv_stream_t* s, ssize_t nread, uv_buf_t const* buffer) {
auto* data = static_cast<cmUVStreamReadHandle*>(s->data);
if (nread > 0) {
(void)buffer;
assert(buffer->base == data->Buffer.data());
data->Buffer.resize(nread);
data->OnRead(std::move(data->Buffer));
} else if (nread < 0 /*|| nread == UV_EOF*/) {
data->OnFinish();
uv_read_stop(s);
}
});
return handle;
}
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