AuroraRuntime/Source/Processes/Open.Win32.cpp

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/***
Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: Open.Win32.cpp
Date: 2021-6-12
Author: Reece
***/
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#include <Source/RuntimeInternal.hpp>
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#include "Processes.hpp"
#include "Open.Win32.hpp"
#include <shellapi.h>
#include <tlhelp32.h>
#include <Source/IO/FS/FS.hpp>
#include "Objbase.h"
#include "shellapi.h"
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namespace Aurora::Processes
{
static AuList<AuString> gOpenItems;
static AuThreadPrimitives::ConditionMutexUnique_t gCondMutex;
static AuThreadPrimitives::ConditionVariableUnique_t gCondVariable;
static AuThreads::ThreadUnique_t gOpenerThread;
static void RunTasks()
{
AU_LOCK_GUARD(gCondMutex);
while (AuIsThreadRunning())
{
try
{
for (const auto &open : gOpenItems)
{
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if (open.empty()) continue; // [*1]
ShellExecuteW(nullptr,
AuIOFS::DirExists(open) ? L"explore" : L"open",
Locale::ConvertFromUTF8(open).c_str(),
nullptr,
nullptr,
SW_SHOWNORMAL);
}
gOpenItems.clear();
gCondVariable->WaitForSignal();
}
catch (...)
{
Debug::PrintError();
AuLogWarn("An error occurred while dispatching a ShellExecute runner frame");
}
}
}
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static void OpenerThread()
{
CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
RunTasks();
CoUninitialize();
}
void InitWin32Opener()
{
gCondMutex = AuThreadPrimitives::ConditionMutexUnique();
SysAssert(gCondMutex);
gCondVariable = AuThreadPrimitives::ConditionVariableUnique(AuUnsafeRaiiToShared(gCondMutex));
SysAssert(gCondVariable);
gOpenerThread = AuThreads::ThreadUnique(AuThreads::ThreadInfo(
AuMakeShared<AuThreads::IThreadVectorsFunctional>(AuThreads::IThreadVectorsFunctional::OnEntry_t(std::bind(OpenerThread)),
AuThreads::IThreadVectorsFunctional::OnExit_t{}),
"COM ShellExecute Runner"
));
SysAssert(gOpenerThread);
gOpenerThread->Run();
}
void DeinitWin32Opener()
{
gOpenerThread->SendExitSignal();
gCondVariable->Broadcast();
gOpenerThread.reset();
gCondVariable.reset();
gCondMutex.reset();
}
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AUKN_SYM void OpenUri(const AuString &uri)
{
AU_LOCK_GUARD(gCondMutex);
AuTryInsert(gOpenItems, uri);
gCondVariable->Broadcast();
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}
AUKN_SYM void OpenFile(const AuString &file)
{
OpenUri(AuIOFS::NormalizePathRet(file));
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}
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}
// TODO: Consider creating blocking apis whose return value is an IProcess (construct from ShellExecuteExW -> in.hProcess, or ("xdg-start", ...))
// For the most part, blocking for a specific application in the context of a protocol or file open request is a dated computing construct.
// Nowdays, opening an editor, mail client, or such like means poking a single executable that'll spawn a fuck ton of background workers, io threads,
// and other resources, to manage multiple instances of whatever the application deals with (think: editor tabs; browser windows; sendto: isnt a modal)
// [*1] :
// We probably ran out of memory.
// AuProcess/Open can safely drop as we expect shells to be kinda fucky and async
//
// Case in point: Minecraft on Linux (would?) blocks when you click a link in chat
//
// Fuck tons of applications support clicking of links, in the case of TS and others, allowing for RCE.
// In the case of MC and others, they don't even know if the operation blocks until the process closes.
// Assuming non-blocking, the API returns false on failure; but if it's blocking, who knows what that
// means... Nonzero exit code? Not enough resources? No error?
//
// Websites, programs, and scripts wouldn't know how to process "missing protocol handler,"
// "not enough resources," "process crashed before pump," "shell busy." For the most part, we don't
// expect expect the developer to be aware of what happens after a request to open a resource is
// requested. It's a lot of engineering effort for what should be fork, exec("start", ...)
//
// Dropping invalid paths, out of memory during UTF8 conversion, and other IO issues is probably fine.
// Use an actual IProcess object, if you care about spawning and monitoring executables.
// TODO: Move the above comments into something less gross