From 3266984243683145647df12f26f4e843849a4cca Mon Sep 17 00:00:00 2001
From: Arseny Smirnov <arseny30@gmail.com>
Date: Mon, 10 Sep 2018 19:21:34 +0300
Subject: [PATCH] BufferedStdin: windows

GitOrigin-RevId: ff7393ea2d648de84f691043aa7780260af77f6d
---
 tdutils/td/utils/port/StdStreams.cpp | 123 +++++++++++++++++++++++++++
 tdutils/td/utils/port/StdStreams.h   |  58 +++++--------
 2 files changed, 143 insertions(+), 38 deletions(-)

diff --git a/tdutils/td/utils/port/StdStreams.cpp b/tdutils/td/utils/port/StdStreams.cpp
index 800d6470..6b0d648c 100644
--- a/tdutils/td/utils/port/StdStreams.cpp
+++ b/tdutils/td/utils/port/StdStreams.cpp
@@ -46,4 +46,127 @@ FileFd &Stderr() {
   );
   return res;
 }
+
+#if TD_WINDOWS
+namespace detail {
+class BufferedStdinImpl {
+ public:
+  BufferedStdinImpl() {
+    file_fd_ = FileFd::from_native_fd(NativeFd(Stdin().get_native_fd().raw()));
+    file_fd_.get_native_fd().set_is_blocking(false);
+    read_thread_ = td::thread([this] { this->read_loop(); });
+  }
+  ~BufferedStdinImpl() {
+    file_fd_.move_as_native_fd().release();
+  }
+  void close() {
+    close_flag_ = true;
+  }
+
+  ChainBufferReader &input_buffer() {
+    return reader_;
+  }
+
+  PollableFdInfo &get_poll_info() {
+    return file_fd_.get_poll_info();
+  }
+  const PollableFdInfo &get_poll_info() const {
+    return file_fd_.get_poll_info();
+  }
+
+  Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT {
+    reader_.sync_with_writer();
+    return reader_.size();
+  }
+
+ private:
+  FileFd file_fd_;
+  ChainBufferWriter writer_;
+  ChainBufferReader reader_ = writer_.extract_reader();
+  td::thread read_thread_;
+
+  std::atomic<bool> close_flag_{false};
+
+  void read_loop() {
+    while (!close_flag_) {
+      auto slice = writer_.prepare_append();
+      auto size = file_fd_.read(slice).move_as_ok();
+      writer_.confirm_append(size);
+      file_fd_.get_poll_info().add_flags_from_poll(td::PollFlags::Read());
+    }
+    //TODO delete
+  }
+};
+void BufferedStdinImplDeleter::operator()(BufferedStdinImpl *impl) {
+  impl->close();
+}
+}  // namespace detail
+#else
+namespace detail {
+class BufferedStdinImpl {
+ public:
+  BufferedStdinImpl() {
+    file_fd_ = FileFd::from_native_fd(NativeFd(Stdin().get_native_fd().raw()));
+    file_fd_.get_native_fd().set_is_blocking(false);
+  }
+  ~BufferedStdinImpl() {
+    file_fd_.move_as_native_fd().release();
+  }
+
+  ChainBufferReader &input_buffer() {
+    return reader_;
+  }
+
+  PollableFdInfo &get_poll_info() {
+    return file_fd_.get_poll_info();
+  }
+  const PollableFdInfo &get_poll_info() const {
+    return file_fd_.get_poll_info();
+  }
+
+  Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT {
+    size_t result = 0;
+    while (::td::can_read(*this) && max_read) {
+      MutableSlice slice = writer_.prepare_append().truncate(max_read);
+      TRY_RESULT(x, file_fd_.read(slice));
+      slice.truncate(x);
+      writer_.confirm_append(x);
+      result += x;
+      max_read -= x;
+    }
+    if (result) {
+      reader_.sync_with_writer();
+    }
+    return result;
+  }
+
+ private:
+  FileFd file_fd_;
+  ChainBufferWriter writer_;
+  ChainBufferReader reader_ = writer_.extract_reader();
+};
+void BufferedStdinImplDeleter::operator()(BufferedStdinImpl *impl) {
+  delete impl;
+}
+}  // namespace detail
+#endif
+BufferedStdin::BufferedStdin() : impl_(std::make_unique<detail::BufferedStdinImpl>().release()) {
+}
+BufferedStdin::BufferedStdin(BufferedStdin &&) = default;
+BufferedStdin &BufferedStdin::operator=(BufferedStdin &&) = default;
+BufferedStdin::~BufferedStdin() = default;
+
+ChainBufferReader &BufferedStdin::input_buffer() {
+  return impl_->input_buffer();
+}
+PollableFdInfo &BufferedStdin::get_poll_info() {
+  return impl_->get_poll_info();
+}
+const PollableFdInfo &BufferedStdin::get_poll_info() const {
+  return impl_->get_poll_info();
+}
+Result<size_t> BufferedStdin::flush_read(size_t max_read) {
+  return impl_->flush_read(max_read);
+}
+
 }  // namespace td
diff --git a/tdutils/td/utils/port/StdStreams.h b/tdutils/td/utils/port/StdStreams.h
index 575b1ae2..e22dbc51 100644
--- a/tdutils/td/utils/port/StdStreams.h
+++ b/tdutils/td/utils/port/StdStreams.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "td/utils/port/FileFd.h"
+#include "td/utils/port/thread.h"
 #include "td/utils/buffer.h"
 
 namespace td {
@@ -15,48 +16,29 @@ FileFd &Stdin();
 FileFd &Stdout();
 FileFd &Stderr();
 
+namespace detail {
+class BufferedStdinImpl;
+class BufferedStdinImplDeleter {
+ public:
+  void operator()(BufferedStdinImpl *impl);
+};
+}  // namespace detail
+
 class BufferedStdin {
  public:
-  BufferedStdin() {
-    file_fd_ = FileFd::from_native_fd(NativeFd(Stdin().get_native_fd().raw()));
-    file_fd_.get_native_fd().set_is_blocking(false);
-  }
-
-  ~BufferedStdin() {
-    file_fd_.move_as_native_fd().release();
-  }
-
-  ChainBufferReader &input_buffer() {
-    return reader_;
-  }
-
-  PollableFdInfo &get_poll_info() {
-    return file_fd_.get_poll_info();
-  }
-  const PollableFdInfo &get_poll_info() const {
-    return file_fd_.get_poll_info();
-  }
-
-  Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT {
-    size_t result = 0;
-    while (::td::can_read(*this) && max_read) {
-      MutableSlice slice = writer_.prepare_append().truncate(max_read);
-      TRY_RESULT(x, file_fd_.read(slice));
-      slice.truncate(x);
-      writer_.confirm_append(x);
-      result += x;
-      max_read -= x;
-    }
-    if (result) {
-      reader_.sync_with_writer();
-    }
-    return result;
-  }
+  BufferedStdin();
+  BufferedStdin(const BufferedStdin &) = delete;
+  BufferedStdin &operator=(const BufferedStdin &) = delete;
+  BufferedStdin(BufferedStdin &&);
+  BufferedStdin &operator=(BufferedStdin &&);
+  ~BufferedStdin();
+  ChainBufferReader &input_buffer();
+  PollableFdInfo &get_poll_info();
+  const PollableFdInfo &get_poll_info() const;
+  Result<size_t> flush_read(size_t max_read = std::numeric_limits<size_t>::max()) TD_WARN_UNUSED_RESULT;
 
  private:
-  FileFd file_fd_;
-  ChainBufferWriter writer_;
-  ChainBufferReader reader_ = writer_.extract_reader();
+  std::unique_ptr<detail::BufferedStdinImpl, detail::BufferedStdinImplDeleter> impl_;
 };
 
 }  // namespace td