gstreamer/subprojects/gst-plugins-bad/sys/win32ipc/protocol/win32ipcpipeserver.cpp

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/* GStreamer
* Copyright (C) 2022 Seungha Yang <seungha@centricular.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "win32ipcpipeserver.h"
#include "win32ipcutils.h"
#include <mutex>
#include <condition_variable>
#include <memory>
#include <thread>
#include <queue>
#include <vector>
#include <string>
#include <algorithm>
#include <assert.h>
GST_DEBUG_CATEGORY_EXTERN (gst_win32_ipc_debug);
#define GST_CAT_DEFAULT gst_win32_ipc_debug
#define CONN_BUFFER_SIZE 1024
struct MmfInfo
{
explicit MmfInfo (Win32IpcMmf * m, const Win32IpcVideoInfo * i, UINT64 s,
void * u, Win32IpcMmfDestroy n)
{
mmf = m;
info = *i;
seq_num = s;
user_data = u;
notify = n;
}
~MmfInfo()
{
if (mmf)
win32_ipc_mmf_unref (mmf);
if (notify)
notify (user_data);
}
Win32IpcMmf *mmf = nullptr;
Win32IpcVideoInfo info;
UINT64 seq_num;
void *user_data;
Win32IpcMmfDestroy notify;
};
struct ServerConnection : public OVERLAPPED
{
ServerConnection(Win32IpcPipeServer * server, HANDLE p)
: self(server), pipe(p)
{
OVERLAPPED *parent = dynamic_cast<OVERLAPPED *> (this);
parent->Internal = 0;
parent->InternalHigh = 0;
parent->Offset = 0;
parent->OffsetHigh = 0;
}
Win32IpcPipeServer *self;
std::shared_ptr<MmfInfo> minfo;
std::vector<std::shared_ptr<MmfInfo>> used_minfo;
HANDLE pipe = INVALID_HANDLE_VALUE;
UINT8 client_msg[CONN_BUFFER_SIZE];
UINT32 to_read = 0;
UINT8 server_msg[CONN_BUFFER_SIZE];
UINT32 to_write = 0;
UINT64 seq_num = 0;
BOOL pending_have_data = FALSE;
};
struct Win32IpcPipeServer
{
explicit Win32IpcPipeServer (const std::string & n)
: name (n), ref_count (1), last_err (ERROR_SUCCESS), seq_num (0)
{
enqueue_event = CreateEventA (nullptr, FALSE, FALSE, nullptr);
cancellable = CreateEventA (nullptr, TRUE, FALSE, nullptr);
}
~Win32IpcPipeServer ()
{
win32_ipc_pipe_server_shutdown (this);
CloseHandle (cancellable);
CloseHandle (enqueue_event);
}
std::mutex lock;
std::condition_variable cond;
std::unique_ptr<std::thread> thread;
std::shared_ptr<MmfInfo> minfo;
std::string name;
std::vector<ServerConnection *> conn;
ULONG ref_count;
HANDLE enqueue_event;
HANDLE cancellable;
UINT last_err;
UINT64 seq_num;
};
static void
win32_ipc_pipe_server_wait_client_msg_async (ServerConnection * conn);
static void
win32_ipc_pipe_server_close_connection (ServerConnection * conn,
BOOL remove_from_list)
{
Win32IpcPipeServer *self = conn->self;
GST_DEBUG ("Closing connection %p", conn);
if (remove_from_list) {
self->conn.erase (std::remove (self->conn.begin (), self->conn.end (),
conn), self->conn.end ());
}
if (!DisconnectNamedPipe (conn->pipe)) {
UINT last_err = GetLastError ();
std::string msg = win32_ipc_error_message (last_err);
GST_WARNING ("DisconnectNamedPipe failed with 0x%x (%s)",
last_err, msg.c_str ());
}
CloseHandle (conn->pipe);
delete conn;
}
static void WINAPI
win32_ipc_pipe_server_send_have_data_finish (DWORD error_code, DWORD n_bytes,
LPOVERLAPPED overlapped)
{
ServerConnection *conn = (ServerConnection *) overlapped;
if (error_code != ERROR_SUCCESS) {
std::string msg = win32_ipc_error_message (error_code);
GST_WARNING ("HAVE-DATA failed with 0x%x (%s)",
(UINT) error_code, msg.c_str ());
win32_ipc_pipe_server_close_connection (conn, TRUE);
return;
}
GST_TRACE ("HAVE-DATA done with %s",
win32_ipc_mmf_get_name (conn->minfo->mmf));
win32_ipc_pipe_server_wait_client_msg_async (conn);
}
static void
win32_ipc_pipe_server_send_have_data_async (ServerConnection * conn)
{
assert (conn->minfo != nullptr);
conn->pending_have_data = FALSE;
conn->seq_num = conn->minfo->seq_num;
conn->to_write = win32_ipc_pkt_build_have_data (conn->server_msg,
CONN_BUFFER_SIZE, conn->seq_num,
win32_ipc_mmf_get_name (conn->minfo->mmf), &conn->minfo->info);
if (conn->to_write == 0) {
GST_ERROR ("Couldn't build HAVE-DATA pkt");
win32_ipc_pipe_server_close_connection (conn, TRUE);
return;
}
conn->seq_num++;
GST_TRACE ("Sending HAVE-DATA");
if (!WriteFileEx (conn->pipe, conn->server_msg, conn->to_write,
(OVERLAPPED *) conn, win32_ipc_pipe_server_send_have_data_finish)) {
UINT last_err = GetLastError ();
std::string msg = win32_ipc_error_message (last_err);
GST_WARNING ("WriteFileEx failed with 0x%x (%s)", last_err, msg.c_str ());
win32_ipc_pipe_server_close_connection (conn, TRUE);
}
}
static void WINAPI
win32_ipc_pipe_server_wait_client_msg_finish (DWORD error_code, DWORD n_bytes,
LPOVERLAPPED overlapped)
{
ServerConnection *conn = (ServerConnection *) overlapped;
UINT64 seq_num;
Win32IpcPktType type;
char mmf_name[1024];
if (error_code != ERROR_SUCCESS) {
std::string msg = win32_ipc_error_message (error_code);
GST_WARNING ("NEED-DATA failed with 0x%x (%s)",
(UINT) error_code, msg.c_str ());
win32_ipc_pipe_server_close_connection (conn, TRUE);
return;
}
type = win32_ipc_pkt_type_from_raw (conn->client_msg[0]);
switch (type) {
case WIN32_IPC_PKT_NEED_DATA:
GST_TRACE ("Got NEED-DATA %p", conn);
if (!win32_ipc_pkt_parse_need_data (conn->client_msg, CONN_BUFFER_SIZE,
&seq_num)) {
GST_ERROR ("Couldn't parse NEED-DATA message");
win32_ipc_pipe_server_close_connection (conn, TRUE);
return;
}
/* Will response later once data is available */
if (!conn->minfo) {
GST_LOG ("No data available, waiting");
conn->pending_have_data = TRUE;
return;
}
win32_ipc_pipe_server_send_have_data_async (conn);
break;
case WIN32_IPC_PKT_READ_DONE:
GST_TRACE ("Got READ-DONE %p", conn);
conn->used_minfo.push_back (conn->minfo);
conn->minfo = nullptr;
/* All done, wait for need-data again */
win32_ipc_pipe_server_wait_client_msg_async (conn);
break;
case WIN32_IPC_PKT_RELEASE_DATA:
{
GST_TRACE ("Got RELEASE-DATA %p", conn);
if (!win32_ipc_pkt_parse_release_data (conn->client_msg, CONN_BUFFER_SIZE,
&seq_num, mmf_name)) {
GST_WARNING ("Couldn't parse RELEASE-DATA mssage");
return;
}
auto it = std::find_if (conn->used_minfo.begin (),
conn->used_minfo.end (), [&](const std::shared_ptr<MmfInfo> info) -> bool {
return strcmp (mmf_name, win32_ipc_mmf_get_name (info->mmf)) == 0;
});
if (it != conn->used_minfo.end ()) {
conn->used_minfo.erase (it);
} else {
GST_WARNING ("Unknown memory name %s", mmf_name);
}
win32_ipc_pipe_server_wait_client_msg_async (conn);
break;
}
default:
GST_WARNING ("Unexpected packet type");
win32_ipc_pipe_server_close_connection (conn, TRUE);
break;
}
}
static void
win32_ipc_pipe_server_wait_client_msg_async (ServerConnection * conn)
{
GST_TRACE ("Waiting client message");
if (!ReadFileEx (conn->pipe, conn->client_msg, CONN_BUFFER_SIZE,
(OVERLAPPED *) conn, win32_ipc_pipe_server_wait_client_msg_finish)) {
UINT last_err = GetLastError ();
std::string msg = win32_ipc_error_message (last_err);
GST_WARNING ("ReadFileEx failed with 0x%x (%s)", last_err, msg.c_str ());
win32_ipc_pipe_server_close_connection (conn, TRUE);
}
}
static HANDLE
win32_ipc_pipe_server_create_pipe (Win32IpcPipeServer * self,
OVERLAPPED * overlap, BOOL * io_pending)
{
HANDLE pipe = CreateNamedPipeA (self->name.c_str (),
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
PIPE_UNLIMITED_INSTANCES,
CONN_BUFFER_SIZE, CONN_BUFFER_SIZE, 5000, nullptr);
if (pipe == INVALID_HANDLE_VALUE) {
self->last_err = GetLastError ();
std::string msg = win32_ipc_error_message (self->last_err);
GST_WARNING ("CreateNamedPipeA failed with 0x%x (%s)",
self->last_err, msg.c_str ());
return INVALID_HANDLE_VALUE;
}
/* Async pipe should return FALSE */
if (ConnectNamedPipe (pipe, overlap)) {
self->last_err = GetLastError ();
std::string msg = win32_ipc_error_message (self->last_err);
GST_WARNING ("ConnectNamedPipe failed with 0x%x (%s)",
self->last_err, msg.c_str ());
CloseHandle (pipe);
return INVALID_HANDLE_VALUE;
}
*io_pending = FALSE;
self->last_err = GetLastError ();
switch (self->last_err) {
case ERROR_IO_PENDING:
*io_pending = TRUE;
break;
case ERROR_PIPE_CONNECTED:
SetEvent (overlap->hEvent);
break;
default:
{
std::string msg = win32_ipc_error_message (self->last_err);
GST_WARNING ("ConnectNamedPipe failed with 0x%x (%s)",
self->last_err, msg.c_str ());
CloseHandle (pipe);
return INVALID_HANDLE_VALUE;
}
}
self->last_err = ERROR_SUCCESS;
return pipe;
}
static void
win32_ipc_pipe_server_loop (Win32IpcPipeServer * self)
{
BOOL io_pending = FALSE;
DWORD n_bytes;
DWORD wait_ret;
HANDLE waitables[3];
HANDLE pipe;
OVERLAPPED overlap;
std::unique_lock<std::mutex> lk (self->lock);
overlap.hEvent = CreateEvent (nullptr, TRUE, TRUE, nullptr);
pipe = win32_ipc_pipe_server_create_pipe (self, &overlap, &io_pending);
if (pipe == INVALID_HANDLE_VALUE) {
CloseHandle (overlap.hEvent);
self->cond.notify_all ();
return;
}
self->last_err = ERROR_SUCCESS;
self->cond.notify_all ();
lk.unlock ();
waitables[0] = overlap.hEvent;
waitables[1] = self->enqueue_event;
waitables[2] = self->cancellable;
do {
ServerConnection *conn;
/* Enters alertable state and wait for
* 1) Client's connection request
* (similar to socket listen/accept in async manner)
* 2) Or, performs completion routines (finish APC)
* 3) Or, terminates if cancellable event was signalled
*/
wait_ret = WaitForMultipleObjectsEx (3, waitables, FALSE, INFINITE, TRUE);
if (wait_ret == WAIT_OBJECT_0 + 2) {
GST_DEBUG ("Operation cancelled");
goto out;
}
switch (wait_ret) {
case WAIT_OBJECT_0:
if (io_pending) {
BOOL ret = GetOverlappedResult (pipe, &overlap, &n_bytes, FALSE);
if (!ret) {
UINT last_err = GetLastError ();
std::string msg = win32_ipc_error_message (last_err);
GST_WARNING ("ConnectNamedPipe failed with 0x%x (%s)",
last_err, msg.c_str ());
CloseHandle (pipe);
break;
}
}
conn = new ServerConnection (self, pipe);
GST_DEBUG ("New connection is established %p", conn);
/* Stores current buffer if available */
lk.lock();
conn->minfo = self->minfo;
lk.unlock ();
pipe = INVALID_HANDLE_VALUE;
self->conn.push_back (conn);
win32_ipc_pipe_server_wait_client_msg_async (conn);
pipe = win32_ipc_pipe_server_create_pipe (self, &overlap, &io_pending);
if (pipe == INVALID_HANDLE_VALUE)
goto out;
break;
case WAIT_OBJECT_0 + 1:
case WAIT_IO_COMPLETION:
{
std::vector<ServerConnection *> pending_conns;
std::shared_ptr<MmfInfo> minfo;
lk.lock();
minfo = self->minfo;
lk.unlock();
if (minfo) {
for (auto iter: self->conn) {
if (iter->pending_have_data && iter->seq_num <= minfo->seq_num) {
iter->minfo = minfo;
pending_conns.push_back (iter);
}
}
}
for (auto iter: pending_conns) {
GST_LOG ("Sending pending have data to %p", iter);
win32_ipc_pipe_server_send_have_data_async (iter);
}
break;
}
default:
GST_WARNING ("Unexpected WaitForMultipleObjectsEx return 0x%x",
(UINT) wait_ret);
goto out;
}
} while (true);
out:
/* Cancels all I/O event issued from this thread */
{
std::vector<HANDLE> pipes;
for (auto iter: self->conn) {
if (iter->pipe != INVALID_HANDLE_VALUE)
pipes.push_back (iter->pipe);
}
for (auto iter: pipes)
CancelIo (iter);
}
for (auto iter: self->conn)
win32_ipc_pipe_server_close_connection (iter, FALSE);
self->conn.clear ();
if (pipe != INVALID_HANDLE_VALUE)
CloseHandle (pipe);
lk.lock ();
CloseHandle (overlap.hEvent);
self->last_err = ERROR_OPERATION_ABORTED;
self->cond.notify_all ();
}
static BOOL
win32_ipc_pipe_server_run (Win32IpcPipeServer * self)
{
std::unique_lock<std::mutex> lk (self->lock);
self->thread = std::make_unique<std::thread>
(std::thread (win32_ipc_pipe_server_loop, self));
self->cond.wait (lk);
if (self->last_err != ERROR_SUCCESS) {
self->thread->join ();
self->thread = nullptr;
return FALSE;
}
return TRUE;
}
Win32IpcPipeServer *
win32_ipc_pipe_server_new (const char * pipe_name)
{
Win32IpcPipeServer *self;
if (!pipe_name)
return nullptr;
self = new Win32IpcPipeServer (pipe_name);
if (!win32_ipc_pipe_server_run (self)) {
win32_ipc_pipe_server_unref (self);
return nullptr;
}
return self;
}
Win32IpcPipeServer *
win32_ipc_pipe_server_ref (Win32IpcPipeServer * server)
{
if (!server)
return nullptr;
InterlockedIncrement (&server->ref_count);
return server;
}
void
win32_ipc_pipe_server_unref (Win32IpcPipeServer * server)
{
ULONG ref_count;
if (!server)
return;
ref_count = InterlockedDecrement (&server->ref_count);
if (ref_count == 0)
delete server;
}
void
win32_ipc_pipe_server_shutdown (Win32IpcPipeServer * server)
{
GST_DEBUG ("Shutting down");
SetEvent (server->cancellable);
if (server->thread) {
server->thread->join ();
server->thread = nullptr;
}
std::lock_guard<std::mutex> lk (server->lock);
server->last_err = ERROR_OPERATION_ABORTED;
server->minfo = nullptr;
server->cond.notify_all ();
}
BOOL
win32_ipc_pipe_server_send_mmf (Win32IpcPipeServer * server, Win32IpcMmf * mmf,
const Win32IpcVideoInfo * info, void * user_data, Win32IpcMmfDestroy notify)
{
std::lock_guard<std::mutex> lk (server->lock);
server->minfo = std::make_shared<MmfInfo> (mmf, info, server->seq_num,
user_data, notify);
GST_LOG ("Enqueue mmf %s", win32_ipc_mmf_get_name (mmf));
server->seq_num++;
/* Wakeup event loop */
SetEvent (server->enqueue_event);
return TRUE;
}