static grpc_endpoint_op_status win_read(grpc_endpoint *ep,
gpr_slice_buffer *read_slices,
grpc_iomgr_closure *cb) {
grpc_tcp *tcp = (grpc_tcp *)ep;
grpc_winsocket *handle = tcp->socket;
grpc_winsocket_callback_info *info = &handle->read_info;
int status;
DWORD bytes_read = 0;
DWORD flags = 0;
WSABUF buffer;
GPR_ASSERT(!tcp->socket->read_info.outstanding);
if (tcp->shutting_down) {
return GRPC_ENDPOINT_ERROR;
}
TCP_REF(tcp, "read");
tcp->socket->read_info.outstanding = 1;
tcp->read_cb = cb;
tcp->read_slices = read_slices;
gpr_slice_buffer_reset_and_unref(read_slices);
tcp->read_slice = gpr_slice_malloc(8192);
buffer.len = GPR_SLICE_LENGTH(tcp->read_slice);
buffer.buf = (char *)GPR_SLICE_START_PTR(tcp->read_slice);
/* First let's try a synchronous, non-blocking read. */
status =
WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags, NULL, NULL);
info->wsa_error = status == 0 ? 0 : WSAGetLastError();
/* Did we get data immediately ? Yay. */
if (info->wsa_error != WSAEWOULDBLOCK) {
int ok;
info->bytes_transfered = bytes_read;
ok = on_read(tcp, 1);
TCP_UNREF(tcp, "read");
return ok ? GRPC_ENDPOINT_DONE : GRPC_ENDPOINT_ERROR;
}
/* Otherwise, let's retry, by queuing a read. */
memset(&tcp->socket->read_info.overlapped, 0, sizeof(OVERLAPPED));
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
&info->overlapped, NULL);
if (status != 0) {
int wsa_error = WSAGetLastError();
if (wsa_error != WSA_IO_PENDING) {
int ok;
info->wsa_error = wsa_error;
ok = on_read(tcp, 1);
return ok ? GRPC_ENDPOINT_DONE : GRPC_ENDPOINT_ERROR;
}
}
grpc_socket_notify_on_read(tcp->socket, on_read_cb, tcp);
return GRPC_ENDPOINT_PENDING;
}
static void win_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
grpc_slice_buffer *read_slices, grpc_closure *cb) {
grpc_tcp *tcp = (grpc_tcp *)ep;
grpc_winsocket *handle = tcp->socket;
grpc_winsocket_callback_info *info = &handle->read_info;
int status;
DWORD bytes_read = 0;
DWORD flags = 0;
WSABUF buffer;
if (tcp->shutting_down) {
GRPC_CLOSURE_SCHED(
exec_ctx, cb,
GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
"TCP socket is shutting down", &tcp->shutdown_error, 1));
return;
}
tcp->read_cb = cb;
tcp->read_slices = read_slices;
grpc_slice_buffer_reset_and_unref_internal(exec_ctx, read_slices);
tcp->read_slice = GRPC_SLICE_MALLOC(8192);
buffer.len = (ULONG)GRPC_SLICE_LENGTH(
tcp->read_slice); // we know slice size fits in 32bit.
buffer.buf = (char *)GRPC_SLICE_START_PTR(tcp->read_slice);
TCP_REF(tcp, "read");
/* First let's try a synchronous, non-blocking read. */
status =
WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags, NULL, NULL);
info->wsa_error = status == 0 ? 0 : WSAGetLastError();
/* Did we get data immediately ? Yay. */
if (info->wsa_error != WSAEWOULDBLOCK) {
info->bytes_transfered = bytes_read;
GRPC_CLOSURE_SCHED(exec_ctx, &tcp->on_read, GRPC_ERROR_NONE);
return;
}
/* Otherwise, let's retry, by queuing a read. */
memset(&tcp->socket->read_info.overlapped, 0, sizeof(OVERLAPPED));
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
&info->overlapped, NULL);
if (status != 0) {
int wsa_error = WSAGetLastError();
if (wsa_error != WSA_IO_PENDING) {
info->wsa_error = wsa_error;
GRPC_CLOSURE_SCHED(exec_ctx, &tcp->on_read,
GRPC_WSA_ERROR(info->wsa_error, "WSARecv"));
return;
}
}
grpc_socket_notify_on_read(exec_ctx, tcp->socket, &tcp->on_read);
}
/* In order to do an async accept, we need to create a socket first which
will be the one assigned to the new incoming connection. */
static void start_accept(grpc_exec_ctx *exec_ctx, grpc_tcp_listener *port) {
SOCKET sock = INVALID_SOCKET;
char *message;
char *utf8_message;
BOOL success;
DWORD addrlen = sizeof(struct sockaddr_in6) + 16;
DWORD bytes_received = 0;
sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sock == INVALID_SOCKET) {
message = "Unable to create socket: %s";
goto failure;
}
if (!grpc_tcp_prepare_socket(sock)) {
message = "Unable to prepare socket: %s";
goto failure;
}
/* Start the "accept" asynchronously. */
success = port->AcceptEx(port->socket->socket, sock, port->addresses, 0,
addrlen, addrlen, &bytes_received,
&port->socket->read_info.overlapped);
/* It is possible to get an accept immediately without delay. However, we
will still get an IOCP notification for it. So let's just ignore it. */
if (!success) {
int error = WSAGetLastError();
if (error != ERROR_IO_PENDING) {
message = "AcceptEx failed: %s";
goto failure;
}
}
/* We're ready to do the accept. Calling grpc_socket_notify_on_read may
immediately process an accept that happened in the meantime. */
port->new_socket = sock;
grpc_socket_notify_on_read(exec_ctx, port->socket, &port->on_accept);
return;
failure:
if (port->shutting_down) {
/* We are abandoning the listener port, take that into account to prevent
occasional hangs on shutdown. The hang happens when sp->shutting_down
change is not seen by on_accept and we proceed to trying new accept,
but we fail there because the listening port has been closed in the
meantime. */
decrement_active_ports_and_notify(exec_ctx, port);
return;
}
utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, message, utf8_message);
gpr_free(utf8_message);
if (sock != INVALID_SOCKET) closesocket(sock);
}
static void win_notify_on_read(grpc_endpoint *ep,
grpc_endpoint_read_cb cb, void *arg) {
grpc_tcp *tcp = (grpc_tcp *) ep;
grpc_winsocket *handle = tcp->socket;
grpc_winsocket_callback_info *info = &handle->read_info;
int status;
DWORD bytes_read = 0;
DWORD flags = 0;
WSABUF buffer;
GPR_ASSERT(!tcp->socket->read_info.outstanding);
if (tcp->shutting_down) {
cb(arg, NULL, 0, GRPC_ENDPOINT_CB_SHUTDOWN);
return;
}
tcp_ref(tcp);
tcp->socket->read_info.outstanding = 1;
tcp->read_cb = cb;
tcp->read_user_data = arg;
tcp->read_slice = gpr_slice_malloc(8192);
buffer.len = GPR_SLICE_LENGTH(tcp->read_slice);
buffer.buf = (char *)GPR_SLICE_START_PTR(tcp->read_slice);
/* First let's try a synchronous, non-blocking read. */
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
NULL, NULL);
info->wsa_error = status == 0 ? 0 : WSAGetLastError();
/* Did we get data immediately ? Yay. */
if (info->wsa_error != WSAEWOULDBLOCK) {
info->bytes_transfered = bytes_read;
/* This might heavily recurse. */
on_read(tcp, 1);
return;
}
/* Otherwise, let's retry, by queuing a read. */
memset(&tcp->socket->read_info.overlapped, 0, sizeof(OVERLAPPED));
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
&info->overlapped, NULL);
if (status != 0) {
int wsa_error = WSAGetLastError();
if (wsa_error != WSA_IO_PENDING) {
info->wsa_error = wsa_error;
on_read(tcp, 1);
return;
}
}
grpc_socket_notify_on_read(tcp->socket, on_read, tcp);
}
/* In order to do an async accept, we need to create a socket first which
will be the one assigned to the new incoming connection. */
static void start_accept(server_port *port) {
SOCKET sock = INVALID_SOCKET;
char *message;
char *utf8_message;
BOOL success;
DWORD addrlen = sizeof(struct sockaddr_in6) + 16;
DWORD bytes_received = 0;
sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sock == INVALID_SOCKET) {
message = "Unable to create socket: %s";
goto failure;
}
if (!grpc_tcp_prepare_socket(sock)) {
message = "Unable to prepare socket: %s";
goto failure;
}
/* Start the "accept" asynchronously. */
success = port->AcceptEx(port->socket->socket, sock, port->addresses, 0,
addrlen, addrlen, &bytes_received,
&port->socket->read_info.overlapped);
/* It is possible to get an accept immediately without delay. However, we
will still get an IOCP notification for it. So let's just ignore it. */
if (!success) {
int error = WSAGetLastError();
if (error != ERROR_IO_PENDING) {
message = "AcceptEx failed: %s";
goto failure;
}
}
/* We're ready to do the accept. Calling grpc_socket_notify_on_read may
immediately process an accept that happened in the meantime. */
port->new_socket = sock;
grpc_socket_notify_on_read(port->socket, on_accept, port);
return;
failure:
utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, message, utf8_message);
gpr_free(utf8_message);
if (sock != INVALID_SOCKET) closesocket(sock);
}
static void start_accept(server_port *port) {
SOCKET sock = INVALID_SOCKET;
char *message;
char *utf8_message;
BOOL success;
DWORD addrlen = sizeof(struct sockaddr_in6) + 16;
DWORD bytes_received = 0;
sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sock == INVALID_SOCKET) {
message = "Unable to create socket: %s";
goto failure;
}
if (!grpc_tcp_prepare_socket(sock)) {
message = "Unable to prepare socket: %s";
goto failure;
}
success = port->AcceptEx(port->socket->socket, sock, port->addresses, 0,
addrlen, addrlen, &bytes_received,
&port->socket->read_info.overlapped);
if (success) {
gpr_log(GPR_DEBUG, "accepted immediately - but we still go to sleep");
} else {
int error = WSAGetLastError();
if (error != ERROR_IO_PENDING) {
message = "AcceptEx failed: %s";
goto failure;
}
}
port->new_socket = sock;
grpc_socket_notify_on_read(port->socket, on_accept, port);
return;
failure:
utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, message, utf8_message);
gpr_free(utf8_message);
if (sock != INVALID_SOCKET) closesocket(sock);
}
static void win_notify_on_read(grpc_endpoint *ep,
grpc_endpoint_read_cb cb, void *arg) {
grpc_tcp *tcp = (grpc_tcp *) ep;
grpc_winsocket *handle = tcp->socket;
grpc_winsocket_callback_info *info = &handle->read_info;
int status;
DWORD bytes_read = 0;
DWORD flags = 0;
int error;
WSABUF buffer;
GPR_ASSERT(!tcp->outstanding_read);
GPR_ASSERT(!tcp->shutting_down);
tcp_ref(tcp);
tcp->outstanding_read = 1;
tcp->read_cb = cb;
tcp->read_user_data = arg;
tcp->read_slice = gpr_slice_malloc(8192);
buffer.len = GPR_SLICE_LENGTH(tcp->read_slice);
buffer.buf = (char *)GPR_SLICE_START_PTR(tcp->read_slice);
/* First let's try a synchronous, non-blocking read. */
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
NULL, NULL);
info->wsa_error = status == 0 ? 0 : WSAGetLastError();
/* Did we get data immediately ? Yay. */
if (info->wsa_error != WSAEWOULDBLOCK) {
info->bytes_transfered = bytes_read;
/* This might heavily recurse. */
on_read(tcp, 1);
return;
}
/* Otherwise, let's retry, by queuing a read. */
memset(&tcp->socket->read_info.overlapped, 0, sizeof(OVERLAPPED));
status = WSARecv(tcp->socket->socket, &buffer, 1, &bytes_read, &flags,
&info->overlapped, NULL);
if (status == 0) {
grpc_socket_notify_on_read(tcp->socket, on_read, tcp);
return;
}
error = WSAGetLastError();
if (error != WSA_IO_PENDING) {
char *utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, "WSARecv error: %s - this means we're going to leak.",
utf8_message);
gpr_free(utf8_message);
/* I'm pretty sure this is a very bad situation there. Hence the log.
What will happen now is that the socket will neither wait for read
or write, unless the caller retry, which is unlikely, but I am not
sure if that's guaranteed. And there might also be a write pending.
This means that the future orphanage of that socket will be in limbo,
and we're going to leak it. I have no idea what could cause this
specific case however, aside from a parameter error from our call.
Normal read errors would actually happen during the overlapped
operation, which is the supported way to go for that. */
tcp->outstanding_read = 0;
tcp_unref(tcp);
cb(arg, NULL, 0, GRPC_ENDPOINT_CB_ERROR);
/* Per the comment above, I'm going to treat that case as a hard failure
for now, and leave the option to catch that and debug. */
__debugbreak();
return;
}
grpc_socket_notify_on_read(tcp->socket, on_read, tcp);
}
