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Implement file support for the WinAPI driver.

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This commit is contained in:
Sönke Ludwig 2017-01-22 02:01:13 +01:00
parent 2a5252977e
commit 6b68e934f3
2 changed files with 192 additions and 20 deletions
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2
README.md
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@ -31,7 +31,7 @@ DNS | yes | yes | no | no
Timers | yes | yes | yes | no
Events | yes | yes | yes | no
Signals | yes² | yes² | no | no
Files | yes | yes | no | no
Files | yes | yes | yes | no
UI Integration | no | no | yes | no
File watcher | yes² | yes² | yes | no

210
source/eventcore/drivers/winapi.d
View file

@ -20,10 +20,10 @@ import core.time : Duration;
import std.experimental.allocator;
import std.socket : Address;
static assert(HANDLE.sizeof <= FD.BaseType.sizeof);
static assert(FD(cast(int)INVALID_HANDLE_VALUE) == FD.init);
final class WinAPIEventDriver : EventDriver {
private {
WinAPIEventDriverCore m_core;
@ -52,7 +52,7 @@ final class WinAPIEventDriver : EventDriver {
m_timers = new LoopTimeoutTimerDriver();
m_core = new WinAPIEventDriverCore(m_timers);
m_events = new WinAPIEventDriverEvents(m_core);
m_files = new WinAPIEventDriverFiles();
m_files = new WinAPIEventDriverFiles(m_core);
m_sockets = new WinAPIEventDriverSockets();
m_dns = new WinAPIEventDriverDNS();
m_watchers = new WinAPIEventDriverWatchers(m_core);
@ -358,58 +358,200 @@ final class WinAPIEventDriverDNS : EventDriverDNS {
final class WinAPIEventDriverFiles : EventDriverFiles {
@safe: /*@nogc:*/ nothrow:
@safe /*@nogc*/ nothrow:
private {
WinAPIEventDriverCore m_core;
}
this(WinAPIEventDriverCore core)
{
m_core = core;
}
override FileFD open(string path, FileOpenMode mode)
{
assert(false, "TODO!");
import std.utf : toUTF16z;
auto access = mode == FileOpenMode.readWrite || mode == FileOpenMode.createTrunc ? (GENERIC_WRITE | GENERIC_READ) :
mode == FileOpenMode.append ? GENERIC_WRITE : GENERIC_READ;
auto shareMode = mode == FileOpenMode.read ? FILE_SHARE_READ : 0;
auto creation = mode == FileOpenMode.createTrunc ? CREATE_ALWAYS : mode == FileOpenMode.append? OPEN_ALWAYS : OPEN_EXISTING;
auto handle = () @trusted {
scope (failure) assert(false);
return CreateFileW(path.toUTF16z, access, shareMode, null, creation,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, null);
} ();
auto errorcode = GetLastError();
if (handle == INVALID_HANDLE_VALUE)
return FileFD.invalid;
if (mode == FileOpenMode.createTrunc && errorcode == ERROR_ALREADY_EXISTS) {
BOOL ret = SetEndOfFile(handle);
if (!ret) {
CloseHandle(handle);
return FileFD.init;
}
}
return adopt(cast(int)handle);
}
override FileFD adopt(int system_handle)
{
assert(false, "TODO!");
auto handle = () @trusted { return cast(HANDLE)system_handle; } ();
DWORD f;
if (!() @trusted { return GetHandleInformation(handle, &f); } ())
return FileFD.init;
auto s = &m_core.setupSlot!FileSlot(handle);
s.read.handle = s.write.handle = handle;
return FileFD(system_handle);
}
override void close(FileFD file)
{
assert(false, "TODO!");
auto h = idToHandle(file);
auto slot = &m_core.m_handles[h].file();
if (slot.read.handle != INVALID_HANDLE_VALUE) {
CloseHandle(h);
slot.read.handle = slot.write.handle = INVALID_HANDLE_VALUE;
}
}
override ulong getSize(FileFD file)
{
assert(false, "TODO!");
LARGE_INTEGER size;
auto succeeded = () @trusted { return GetFileSizeEx(idToHandle(file), &size); } ();
if (!succeeded || size.QuadPart < 0)
return ulong.max;
return size.QuadPart;
}
override void write(FileFD file, ulong offset, const(ubyte)[] buffer, IOMode mode, FileIOCallback on_write_finish)
{
assert(false, "TODO!");
if (!buffer.length) {
on_write_finish(file, IOStatus.ok, 0);
return;
}
auto h = idToHandle(file);
auto slot = &m_core.m_handles[h].file.write;
slot.bytesTransferred = 0;
slot.offset = offset;
slot.buffer = buffer;
slot.mode = mode;
slot.callback = on_write_finish;
startIO!(WriteFileEx, true)(h, slot);
}
override void read(FileFD file, ulong offset, ubyte[] buffer, IOMode mode, FileIOCallback on_read_finish)
{
assert(false, "TODO!");
if (!buffer.length) {
on_read_finish(file, IOStatus.ok, 0);
return;
}
auto h = idToHandle(file);
auto slot = &m_core.m_handles[h].file.read;
slot.bytesTransferred = 0;
slot.offset = offset;
slot.buffer = buffer;
slot.mode = mode;
slot.callback = on_read_finish;
startIO!(ReadFileEx, false)(h, slot);
}
override void cancelWrite(FileFD file)
{
assert(false, "TODO!");
auto h = idToHandle(file);
cancelIO!true(h, m_core.m_handles[h].file.write);
}
override void cancelRead(FileFD file)
{
assert(false, "TODO!");
auto h = idToHandle(file);
cancelIO!false(h, m_core.m_handles[h].file.read);
}
override void addRef(FileFD descriptor)
{
assert(false, "TODO!");
m_core.m_handles[idToHandle(descriptor)].addRef();
}
override bool releaseRef(FileFD descriptor)
{
assert(false, "TODO!");
auto h = idToHandle(descriptor);
return m_core.m_handles[h].releaseRef({
close(descriptor);
m_core.freeSlot(h);
});
}
private static void startIO(alias fun, bool RO)(HANDLE h, FileSlot.Direction!RO* slot)
{
import std.algorithm.comparison : min;
with (slot.overlapped) {
Internal = 0;
InternalHigh = 0;
Offset = cast(uint)(slot.offset & 0xFFFFFFFF);
OffsetHigh = cast(uint)(slot.offset >> 32);
hEvent = () @trusted { return cast(HANDLE)slot; } ();
}
auto nbytes = min(slot.buffer.length, DWORD.max);
if (!() @trusted { return fun(h, &slot.buffer[0], nbytes, &slot.overlapped, &onIOFinished!(fun, RO)); } ()) {
slot.invokeCallback(IOStatus.error, slot.bytesTransferred);
}
}
private static void cancelIO(bool RO)(HANDLE h, ref FileSlot.Direction!RO slot)
{
if (slot.callback) {
//CancelIoEx(h, &slot.overlapped); // FIXME: currently causes linker errors for DMD due to outdated kernel32.lib files
slot.callback = null;
slot.buffer = null;
}
}
private static extern(Windows)
void onIOFinished(alias fun, bool RO)(DWORD error, DWORD bytes_transferred, OVERLAPPED* overlapped)
{
auto slot = () @trusted { return cast(FileSlot.Direction!RO*)overlapped.hEvent; } ();
assert(slot !is null);
HANDLE h = slot.handle;
auto id = FileFD(cast(int)h);
if (!slot.callback) {
// request was already cancelled
return;
}
if (error != 0) {
slot.invokeCallback(IOStatus.error, slot.bytesTransferred + bytes_transferred);
return;
}
slot.bytesTransferred += bytes_transferred;
slot.offset += bytes_transferred;
if (slot.bytesTransferred >= slot.buffer.length || slot.mode != IOMode.all) {
slot.invokeCallback(IOStatus.ok, slot.bytesTransferred);
} else {
startIO!(fun, RO)(h, slot);
}
}
private static HANDLE idToHandle(FileFD id)
@trusted {
return cast(HANDLE)cast(int)id;
}
}
final class WinAPIEventDriverEvents : EventDriverEvents {
@safe: /*@nogc:*/ nothrow:
private {
@ -656,18 +798,15 @@ final class WinAPIEventDriverWatchers : EventDriverWatchers {
override bool releaseRef(WatcherID descriptor)
{
bool freed;
auto handle = idToHandle(descriptor);
m_core.m_handles[handle].releaseRef(()nothrow{
return m_core.m_handles[handle].releaseRef(()nothrow{
CloseHandle(handle);
() @trusted {
try theAllocator.dispose(m_core.m_handles[handle].watcher.buffer);
catch (Exception e) assert(false, "Freeing directory watcher buffer failed.");
} ();
m_core.freeSlot(handle);
freed = true;
});
return !freed;
}
private static nothrow extern(System)
@ -747,6 +886,7 @@ private long currStdTime()
private struct HandleSlot {
static union SpecificTypes {
typeof(null) none;
FileSlot files;
WatcherSlot watcher;
}
int refCount;
@ -754,6 +894,7 @@ private struct HandleSlot {
@safe nothrow:
@property ref FileSlot file() { return specific.get!FileSlot; }
@property ref WatcherSlot watcher() { return specific.get!WatcherSlot; }
void addRef()
@ -762,12 +903,38 @@ private struct HandleSlot {
refCount++;
}
void releaseRef(scope void delegate() @safe nothrow on_free)
bool releaseRef(scope void delegate() @safe nothrow on_free)
{
assert(refCount > 0);
if (--refCount == 0)
if (--refCount == 0) {
on_free();
return false;
}
return true;
}
}
private struct FileSlot {
static struct Direction(bool RO) {
OVERLAPPED overlapped;
FileIOCallback callback;
ulong offset;
size_t bytesTransferred;
IOMode mode;
static if (RO) const(ubyte)[] buffer;
else ubyte[] buffer;
HANDLE handle; // set to INVALID_HANDLE_VALUE when closed
void invokeCallback(IOStatus status, size_t bytes_transferred)
@safe nothrow {
auto cb = this.callback;
this.callback = null;
assert(cb !is null);
cb(FileFD(cast(int)this.handle), status, bytes_transferred);
}
}
Direction!false read;
Direction!true write;
}
private struct WatcherSlot {
@ -777,3 +944,8 @@ private struct WatcherSlot {
bool recursive;
FileChangesCallback callback;
}
private extern(Windows) @trusted nothrow @nogc {
BOOL SetEndOfFile(HANDLE hFile);
BOOL CancelIoEx(HANDLE hFile, OVERLAPPED* lpOverlapped);
}