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Diffstat (limited to 'src/core/lib/iomgr/tcp_windows.c')
-rw-r--r--src/core/lib/iomgr/tcp_windows.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/tcp_windows.c b/src/core/lib/iomgr/tcp_windows.c
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index 0000000000..c1ce725f2c
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+++ b/src/core/lib/iomgr/tcp_windows.c
@@ -0,0 +1,402 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_WINSOCK_SOCKET
+
+#include "src/core/lib/iomgr/sockaddr_win32.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/log_win32.h>
+#include <grpc/support/slice_buffer.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/lib/iomgr/iocp_windows.h"
+#include "src/core/lib/iomgr/sockaddr.h"
+#include "src/core/lib/iomgr/sockaddr_utils.h"
+#include "src/core/lib/iomgr/socket_windows.h"
+#include "src/core/lib/iomgr/tcp_client.h"
+#include "src/core/lib/iomgr/timer.h"
+
+static int set_non_block(SOCKET sock) {
+ int status;
+ unsigned long param = 1;
+ DWORD ret;
+ status =
+ WSAIoctl(sock, FIONBIO, &param, sizeof(param), NULL, 0, &ret, NULL, NULL);
+ return status == 0;
+}
+
+static int set_dualstack(SOCKET sock) {
+ int status;
+ unsigned long param = 0;
+ status = setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&param,
+ sizeof(param));
+ return status == 0;
+}
+
+int grpc_tcp_prepare_socket(SOCKET sock) {
+ if (!set_non_block(sock)) return 0;
+ if (!set_dualstack(sock)) return 0;
+ return 1;
+}
+
+typedef struct grpc_tcp {
+ /* This is our C++ class derivation emulation. */
+ grpc_endpoint base;
+ /* The one socket this endpoint is using. */
+ grpc_winsocket *socket;
+ /* Refcounting how many operations are in progress. */
+ gpr_refcount refcount;
+
+ grpc_closure on_read;
+ grpc_closure on_write;
+
+ grpc_closure *read_cb;
+ grpc_closure *write_cb;
+ gpr_slice read_slice;
+ gpr_slice_buffer *write_slices;
+ gpr_slice_buffer *read_slices;
+
+ /* The IO Completion Port runs from another thread. We need some mechanism
+ to protect ourselves when requesting a shutdown. */
+ gpr_mu mu;
+ int shutting_down;
+
+ char *peer_string;
+} grpc_tcp;
+
+static void tcp_free(grpc_tcp *tcp) {
+ grpc_winsocket_destroy(tcp->socket);
+ gpr_mu_destroy(&tcp->mu);
+ gpr_free(tcp->peer_string);
+ gpr_free(tcp);
+}
+
+/*#define GRPC_TCP_REFCOUNT_DEBUG*/
+#ifdef GRPC_TCP_REFCOUNT_DEBUG
+#define TCP_UNREF(tcp, reason) tcp_unref((tcp), (reason), __FILE__, __LINE__)
+#define TCP_REF(tcp, reason) tcp_ref((tcp), (reason), __FILE__, __LINE__)
+static void tcp_unref(grpc_tcp *tcp, const char *reason, const char *file,
+ int line) {
+ gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP unref %p : %s %d -> %d", tcp,
+ reason, tcp->refcount.count, tcp->refcount.count - 1);
+ if (gpr_unref(&tcp->refcount)) {
+ tcp_free(tcp);
+ }
+}
+
+static void tcp_ref(grpc_tcp *tcp, const char *reason, const char *file,
+ int line) {
+ gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP ref %p : %s %d -> %d", tcp,
+ reason, tcp->refcount.count, tcp->refcount.count + 1);
+ gpr_ref(&tcp->refcount);
+}
+#else
+#define TCP_UNREF(tcp, reason) tcp_unref((tcp))
+#define TCP_REF(tcp, reason) tcp_ref((tcp))
+static void tcp_unref(grpc_tcp *tcp) {
+ if (gpr_unref(&tcp->refcount)) {
+ tcp_free(tcp);
+ }
+}
+
+static void tcp_ref(grpc_tcp *tcp) { gpr_ref(&tcp->refcount); }
+#endif
+
+/* Asynchronous callback from the IOCP, or the background thread. */
+static void on_read(grpc_exec_ctx *exec_ctx, void *tcpp, bool success) {
+ grpc_tcp *tcp = tcpp;
+ grpc_closure *cb = tcp->read_cb;
+ grpc_winsocket *socket = tcp->socket;
+ gpr_slice sub;
+ grpc_winsocket_callback_info *info = &socket->read_info;
+
+ if (success) {
+ if (info->wsa_error != 0 && !tcp->shutting_down) {
+ if (info->wsa_error != WSAECONNRESET) {
+ char *utf8_message = gpr_format_message(info->wsa_error);
+ gpr_log(GPR_ERROR, "ReadFile overlapped error: %s", utf8_message);
+ gpr_free(utf8_message);
+ }
+ success = 0;
+ gpr_slice_unref(tcp->read_slice);
+ } else {
+ if (info->bytes_transfered != 0 && !tcp->shutting_down) {
+ sub = gpr_slice_sub_no_ref(tcp->read_slice, 0, info->bytes_transfered);
+ gpr_slice_buffer_add(tcp->read_slices, sub);
+ success = 1;
+ } else {
+ gpr_slice_unref(tcp->read_slice);
+ success = 0;
+ }
+ }
+ }
+
+ tcp->read_cb = NULL;
+ TCP_UNREF(tcp, "read");
+ if (cb) {
+ cb->cb(exec_ctx, cb->cb_arg, success);
+ }
+}
+
+static void win_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+ gpr_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_exec_ctx_enqueue(exec_ctx, cb, false, NULL);
+ return;
+ }
+
+ 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 = (ULONG)GPR_SLICE_LENGTH(
+ tcp->read_slice); // we know slice size fits in 32bit.
+ buffer.buf = (char *)GPR_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_exec_ctx_enqueue(exec_ctx, &tcp->on_read, true, NULL);
+ 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_exec_ctx_enqueue(exec_ctx, &tcp->on_read, false, NULL);
+ return;
+ }
+ }
+
+ grpc_socket_notify_on_read(exec_ctx, tcp->socket, &tcp->on_read);
+}
+
+/* Asynchronous callback from the IOCP, or the background thread. */
+static void on_write(grpc_exec_ctx *exec_ctx, void *tcpp, bool success) {
+ grpc_tcp *tcp = (grpc_tcp *)tcpp;
+ grpc_winsocket *handle = tcp->socket;
+ grpc_winsocket_callback_info *info = &handle->write_info;
+ grpc_closure *cb;
+
+ gpr_mu_lock(&tcp->mu);
+ cb = tcp->write_cb;
+ tcp->write_cb = NULL;
+ gpr_mu_unlock(&tcp->mu);
+
+ if (success) {
+ if (info->wsa_error != 0) {
+ if (info->wsa_error != WSAECONNRESET) {
+ char *utf8_message = gpr_format_message(info->wsa_error);
+ gpr_log(GPR_ERROR, "WSASend overlapped error: %s", utf8_message);
+ gpr_free(utf8_message);
+ }
+ success = 0;
+ } else {
+ GPR_ASSERT(info->bytes_transfered == tcp->write_slices->length);
+ }
+ }
+
+ TCP_UNREF(tcp, "write");
+ cb->cb(exec_ctx, cb->cb_arg, success);
+}
+
+/* Initiates a write. */
+static void win_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+ gpr_slice_buffer *slices, grpc_closure *cb) {
+ grpc_tcp *tcp = (grpc_tcp *)ep;
+ grpc_winsocket *socket = tcp->socket;
+ grpc_winsocket_callback_info *info = &socket->write_info;
+ unsigned i;
+ DWORD bytes_sent;
+ int status;
+ WSABUF local_buffers[16];
+ WSABUF *allocated = NULL;
+ WSABUF *buffers = local_buffers;
+ size_t len;
+
+ if (tcp->shutting_down) {
+ grpc_exec_ctx_enqueue(exec_ctx, cb, false, NULL);
+ return;
+ }
+
+ tcp->write_cb = cb;
+ tcp->write_slices = slices;
+ GPR_ASSERT(tcp->write_slices->count <= UINT_MAX);
+ if (tcp->write_slices->count > GPR_ARRAY_SIZE(local_buffers)) {
+ buffers = (WSABUF *)gpr_malloc(sizeof(WSABUF) * tcp->write_slices->count);
+ allocated = buffers;
+ }
+
+ for (i = 0; i < tcp->write_slices->count; i++) {
+ len = GPR_SLICE_LENGTH(tcp->write_slices->slices[i]);
+ GPR_ASSERT(len <= ULONG_MAX);
+ buffers[i].len = (ULONG)len;
+ buffers[i].buf = (char *)GPR_SLICE_START_PTR(tcp->write_slices->slices[i]);
+ }
+
+ /* First, let's try a synchronous, non-blocking write. */
+ status = WSASend(socket->socket, buffers, (DWORD)tcp->write_slices->count,
+ &bytes_sent, 0, NULL, NULL);
+ info->wsa_error = status == 0 ? 0 : WSAGetLastError();
+
+ /* We would kind of expect to get a WSAEWOULDBLOCK here, especially on a busy
+ connection that has its send queue filled up. But if we don't, then we can
+ avoid doing an async write operation at all. */
+ if (info->wsa_error != WSAEWOULDBLOCK) {
+ bool ok = false;
+ if (status == 0) {
+ ok = true;
+ GPR_ASSERT(bytes_sent == tcp->write_slices->length);
+ } else {
+ if (info->wsa_error != WSAECONNRESET) {
+ char *utf8_message = gpr_format_message(info->wsa_error);
+ gpr_log(GPR_ERROR, "WSASend error: %s", utf8_message);
+ gpr_free(utf8_message);
+ }
+ }
+ if (allocated) gpr_free(allocated);
+ grpc_exec_ctx_enqueue(exec_ctx, cb, ok, NULL);
+ return;
+ }
+
+ TCP_REF(tcp, "write");
+
+ /* If we got a WSAEWOULDBLOCK earlier, then we need to re-do the same
+ operation, this time asynchronously. */
+ memset(&socket->write_info.overlapped, 0, sizeof(OVERLAPPED));
+ status = WSASend(socket->socket, buffers, (DWORD)tcp->write_slices->count,
+ &bytes_sent, 0, &socket->write_info.overlapped, NULL);
+ if (allocated) gpr_free(allocated);
+
+ if (status != 0) {
+ int wsa_error = WSAGetLastError();
+ if (wsa_error != WSA_IO_PENDING) {
+ TCP_UNREF(tcp, "write");
+ grpc_exec_ctx_enqueue(exec_ctx, cb, false, NULL);
+ return;
+ }
+ }
+
+ /* As all is now setup, we can now ask for the IOCP notification. It may
+ trigger the callback immediately however, but no matter. */
+ grpc_socket_notify_on_write(exec_ctx, socket, &tcp->on_write);
+}
+
+static void win_add_to_pollset(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+ grpc_pollset *ps) {
+ grpc_tcp *tcp;
+ (void)ps;
+ tcp = (grpc_tcp *)ep;
+ grpc_iocp_add_socket(tcp->socket);
+}
+
+static void win_add_to_pollset_set(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+ grpc_pollset_set *pss) {
+ grpc_tcp *tcp;
+ (void)pss;
+ tcp = (grpc_tcp *)ep;
+ grpc_iocp_add_socket(tcp->socket);
+}
+
+/* Initiates a shutdown of the TCP endpoint. This will queue abort callbacks
+ for the potential read and write operations. It is up to the caller to
+ guarantee this isn't called in parallel to a read or write request, so
+ we're not going to protect against these. However the IO Completion Port
+ callback will happen from another thread, so we need to protect against
+ concurrent access of the data structure in that regard. */
+static void win_shutdown(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) {
+ grpc_tcp *tcp = (grpc_tcp *)ep;
+ gpr_mu_lock(&tcp->mu);
+ /* At that point, what may happen is that we're already inside the IOCP
+ callback. See the comments in on_read and on_write. */
+ tcp->shutting_down = 1;
+ grpc_winsocket_shutdown(tcp->socket);
+ gpr_mu_unlock(&tcp->mu);
+}
+
+static void win_destroy(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) {
+ grpc_tcp *tcp = (grpc_tcp *)ep;
+ TCP_UNREF(tcp, "destroy");
+}
+
+static char *win_get_peer(grpc_endpoint *ep) {
+ grpc_tcp *tcp = (grpc_tcp *)ep;
+ return gpr_strdup(tcp->peer_string);
+}
+
+static grpc_endpoint_vtable vtable = {
+ win_read, win_write, win_add_to_pollset, win_add_to_pollset_set,
+ win_shutdown, win_destroy, win_get_peer};
+
+grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket, char *peer_string) {
+ grpc_tcp *tcp = (grpc_tcp *)gpr_malloc(sizeof(grpc_tcp));
+ memset(tcp, 0, sizeof(grpc_tcp));
+ tcp->base.vtable = &vtable;
+ tcp->socket = socket;
+ gpr_mu_init(&tcp->mu);
+ gpr_ref_init(&tcp->refcount, 1);
+ grpc_closure_init(&tcp->on_read, on_read, tcp);
+ grpc_closure_init(&tcp->on_write, on_write, tcp);
+ tcp->peer_string = gpr_strdup(peer_string);
+ return &tcp->base;
+}
+
+#endif /* GPR_WINSOCK_SOCKET */
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