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-rw-r--r--src/ClientWrite.cxx289
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diff --git a/src/ClientWrite.cxx b/src/ClientWrite.cxx
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+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ClientInternal.hxx"
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+static size_t
+client_write_deferred_buffer(Client *client,
+ const struct deferred_buffer *buffer)
+{
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_written;
+
+ assert(client != NULL);
+ assert(client->channel != NULL);
+ assert(buffer != NULL);
+
+ status = g_io_channel_write_chars
+ (client->channel, buffer->data, buffer->size,
+ &bytes_written, &error);
+ switch (status) {
+ case G_IO_STATUS_NORMAL:
+ return bytes_written;
+
+ case G_IO_STATUS_AGAIN:
+ return 0;
+
+ case G_IO_STATUS_EOF:
+ /* client has disconnected */
+
+ client_set_expired(client);
+ return 0;
+
+ case G_IO_STATUS_ERROR:
+ /* I/O error */
+
+ client_set_expired(client);
+ g_warning("failed to flush buffer for %i: %s",
+ client->num, error->message);
+ g_error_free(error);
+ return 0;
+ }
+
+ /* unreachable */
+ return 0;
+}
+
+void
+client_write_deferred(Client *client)
+{
+ size_t ret;
+
+ while (!g_queue_is_empty(client->deferred_send)) {
+ struct deferred_buffer *buf =
+ (struct deferred_buffer *)
+ g_queue_peek_head(client->deferred_send);
+
+ assert(buf->size > 0);
+ assert(buf->size <= client->deferred_bytes);
+
+ ret = client_write_deferred_buffer(client, buf);
+ if (ret == 0)
+ break;
+
+ if (ret < buf->size) {
+ assert(client->deferred_bytes >= (size_t)ret);
+ client->deferred_bytes -= ret;
+ buf->size -= ret;
+ memmove(buf->data, buf->data + ret, buf->size);
+ break;
+ } else {
+ size_t decr = sizeof(*buf) -
+ sizeof(buf->data) + buf->size;
+
+ assert(client->deferred_bytes >= decr);
+ client->deferred_bytes -= decr;
+ g_free(buf);
+ g_queue_pop_head(client->deferred_send);
+ }
+
+ g_timer_start(client->last_activity);
+ }
+
+ if (g_queue_is_empty(client->deferred_send)) {
+ g_debug("[%u] buffer empty %lu", client->num,
+ (unsigned long)client->deferred_bytes);
+ assert(client->deferred_bytes == 0);
+ }
+}
+
+static void
+client_defer_output(Client *client, const void *data, size_t length)
+{
+ size_t alloc;
+ struct deferred_buffer *buf;
+
+ assert(length > 0);
+
+ alloc = sizeof(*buf) - sizeof(buf->data) + length;
+ client->deferred_bytes += alloc;
+ if (client->deferred_bytes > client_max_output_buffer_size) {
+ g_warning("[%u] output buffer size (%lu) is "
+ "larger than the max (%lu)",
+ client->num,
+ (unsigned long)client->deferred_bytes,
+ (unsigned long)client_max_output_buffer_size);
+ /* cause client to close */
+ client_set_expired(client);
+ return;
+ }
+
+ buf = (struct deferred_buffer *)g_malloc(alloc);
+ buf->size = length;
+ memcpy(buf->data, data, length);
+
+ g_queue_push_tail(client->deferred_send, buf);
+}
+
+static void
+client_write_direct(Client *client, const char *data, size_t length)
+{
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_written;
+
+ assert(client != NULL);
+ assert(client->channel != NULL);
+ assert(data != NULL);
+ assert(length > 0);
+ assert(g_queue_is_empty(client->deferred_send));
+
+ status = g_io_channel_write_chars(client->channel, data, length,
+ &bytes_written, &error);
+ switch (status) {
+ case G_IO_STATUS_NORMAL:
+ case G_IO_STATUS_AGAIN:
+ break;
+
+ case G_IO_STATUS_EOF:
+ /* client has disconnected */
+
+ client_set_expired(client);
+ return;
+
+ case G_IO_STATUS_ERROR:
+ /* I/O error */
+
+ client_set_expired(client);
+ g_warning("failed to write to %i: %s",
+ client->num, error->message);
+ g_error_free(error);
+ return;
+ }
+
+ if (bytes_written < length)
+ client_defer_output(client, data + bytes_written,
+ length - bytes_written);
+
+ if (!g_queue_is_empty(client->deferred_send))
+ g_debug("[%u] buffer created", client->num);
+}
+
+void
+client_write_output(Client *client)
+{
+ if (client_is_expired(client) || !client->send_buf_used)
+ return;
+
+ if (!g_queue_is_empty(client->deferred_send)) {
+ client_defer_output(client, client->send_buf,
+ client->send_buf_used);
+
+ if (client_is_expired(client))
+ return;
+
+ /* try to flush the deferred buffers now; the current
+ server command may take too long to finish, and
+ meanwhile try to feed output to the client,
+ otherwise it will time out. One reason why
+ deferring is slow might be that currently each
+ client_write() allocates a new deferred buffer.
+ This should be optimized after MPD 0.14. */
+ client_write_deferred(client);
+ } else
+ client_write_direct(client, client->send_buf,
+ client->send_buf_used);
+
+ client->send_buf_used = 0;
+}
+
+/**
+ * Write a block of data to the client.
+ */
+static void
+client_write(Client *client, const char *buffer, size_t buflen)
+{
+ /* if the client is going to be closed, do nothing */
+ if (client_is_expired(client))
+ return;
+
+ while (buflen > 0 && !client_is_expired(client)) {
+ size_t copylen;
+
+ assert(client->send_buf_used < sizeof(client->send_buf));
+
+ copylen = sizeof(client->send_buf) - client->send_buf_used;
+ if (copylen > buflen)
+ copylen = buflen;
+
+ memcpy(client->send_buf + client->send_buf_used, buffer,
+ copylen);
+ buflen -= copylen;
+ client->send_buf_used += copylen;
+ buffer += copylen;
+ if (client->send_buf_used >= sizeof(client->send_buf))
+ client_write_output(client);
+ }
+}
+
+void
+client_puts(Client *client, const char *s)
+{
+ client_write(client, s, strlen(s));
+}
+
+void
+client_vprintf(Client *client, const char *fmt, va_list args)
+{
+#ifndef G_OS_WIN32
+ va_list tmp;
+ int length;
+
+ va_copy(tmp, args);
+ length = vsnprintf(NULL, 0, fmt, tmp);
+ va_end(tmp);
+
+ if (length <= 0)
+ /* wtf.. */
+ return;
+
+ char *buffer = (char *)g_malloc(length + 1);
+ vsnprintf(buffer, length + 1, fmt, args);
+ client_write(client, buffer, length);
+ g_free(buffer);
+#else
+ /* On mingw32, snprintf() expects a 64 bit integer instead of
+ a "long int" for "%li". This is not consistent with our
+ expectation, so we're using plain sprintf() here, hoping
+ the static buffer is large enough. Sorry for this hack,
+ but WIN32 development is so painful, I'm not in the mood to
+ do it properly now. */
+
+ static char buffer[4096];
+ vsprintf(buffer, fmt, args);
+ client_write(client, buffer, strlen(buffer));
+#endif
+}
+
+G_GNUC_PRINTF(2, 3)
+void
+client_printf(Client *client, const char *fmt, ...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ client_vprintf(client, fmt, args);
+ va_end(args);
+}