[spice-gtk v2 02/16] file-xfer: introduce flush_callback and flush_done

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By introducing a flush_callback such as SpiceFileTransferTaskFlushCb
SpiceFileTransferTask becomes agnostic on how channel-main flushes
the data.

The spice_file_transfer_task_flush_done() function is now introduced
to tell SpiceFileTransferTask that flushing is over and we can read
more data if no error has happened.

Helper functions spice_file_transfer_task_get_channel() and
spice_file_transfer_task_get_cancellable() were created to retrieve
properties from SpiceFileTransferTask without the need to access its
private structure.

This change is related to split SpiceFileTransferTask from
channel-main.
---
 src/channel-main.c | 157 +++++++++++++++++++++++++++++++++++------------------
 1 file changed, 105 insertions(+), 52 deletions(-)

diff --git a/src/channel-main.c b/src/channel-main.c
index 4fb514e..f4e8c2b 100644
--- a/src/channel-main.c
+++ b/src/channel-main.c
@@ -77,6 +77,16 @@ G_DEFINE_TYPE(SpiceFileTransferTask, spice_file_transfer_task, G_TYPE_OBJECT)
         (G_TYPE_INSTANCE_GET_PRIVATE((o), SPICE_TYPE_FILE_TRANSFER_TASK, SpiceFileTransferTaskPrivate))
 
 #define FILE_XFER_CHUNK_SIZE (VD_AGENT_MAX_DATA_SIZE * 32)
+
+typedef void (*SpiceFileTransferTaskFlushCb)(SpiceFileTransferTask *xfer_task,
+                                             void *buffer,
+                                             gssize count,
+                                             gpointer user_data);
+
+static SpiceMainChannel *spice_file_transfer_task_get_channel(SpiceFileTransferTask *self);
+static GCancellable *spice_file_transfer_task_get_cancellable(SpiceFileTransferTask *self);
+static void spice_file_transfer_task_flush_done(SpiceFileTransferTask *self, GError *error);
+
 struct _SpiceFileTransferTaskPrivate
 
 /* private */
@@ -90,6 +100,8 @@ struct _SpiceFileTransferTaskPrivate
     GCancellable                   *cancellable;
     GFileProgressCallback          progress_callback;
     gpointer                       progress_callback_data;
+    SpiceFileTransferTaskFlushCb   flush_callback;
+    gpointer                       flush_callback_data;
     GAsyncReadyCallback            callback;
     gpointer                       user_data;
     char                           *buffer;
@@ -1851,70 +1863,46 @@ static void file_xfer_data_flushed_cb(GObject *source_object,
     SpiceMainChannel *channel = (SpiceMainChannel *)source_object;
     GError *error = NULL;
 
-    self->priv->pending = FALSE;
     file_xfer_flush_finish(channel, res, &error);
-    if (error || self->priv->error) {
-        spice_file_transfer_task_completed(self, error);
-        return;
-    }
-
-    if (spice_util_get_debug()) {
-        const GTimeSpan interval = 20 * G_TIME_SPAN_SECOND;
-        gint64 now = g_get_monotonic_time();
-
-        if (interval < now - self->priv->last_update) {
-            gchar *basename = g_file_get_basename(self->priv->file);
-            self->priv->last_update = now;
-            SPICE_DEBUG("transferred %.2f%% of the file %s",
-                        100.0 * self->priv->read_bytes / self->priv->file_size, basename);
-            g_free(basename);
-        }
-    }
-
-    if (self->priv->progress_callback) {
-        goffset read = 0;
-        goffset total = 0;
-        SpiceMainChannel *main_channel = self->priv->channel;
-        GHashTableIter iter;
-        gpointer key, value;
-
-        /* since the progress_callback does not have a parameter to indicate
-         * which file the progress is associated with, report progress on all
-         * current transfers */
-        g_hash_table_iter_init(&iter, main_channel->priv->file_xfer_tasks);
-        while (g_hash_table_iter_next(&iter, &key, &value)) {
-            SpiceFileTransferTask *t = (SpiceFileTransferTask *)value;
-            read += t->priv->read_bytes;
-            total += t->priv->file_size;
-        }
-
-        self->priv->progress_callback(read, total, self->priv->progress_callback_data);
-    }
-
-    /* Read more data */
-    file_xfer_continue_read(self);
+    spice_file_transfer_task_flush_done(self, error);
 }
 
-static void file_xfer_queue(SpiceFileTransferTask *self, int data_size)
+static void file_xfer_queue(SpiceFileTransferTask *xfer_task, void *buffer, int data_size)
 {
     VDAgentFileXferDataMessage msg;
-    SpiceMainChannel *channel = SPICE_MAIN_CHANNEL(self->priv->channel);
+    SpiceMainChannel *channel = spice_file_transfer_task_get_channel(xfer_task);
 
-    msg.id = self->priv->id;
+    g_object_get(xfer_task, "id", &msg.id, NULL);
     msg.size = data_size;
     agent_msg_queue_many(channel, VD_AGENT_FILE_XFER_DATA,
                          &msg, sizeof(msg),
-                         self->priv->buffer, data_size, NULL);
+                         buffer, data_size, NULL);
     spice_channel_wakeup(SPICE_CHANNEL(channel), FALSE);
 }
 
+static void file_xfer_flush_callback(SpiceFileTransferTask *xfer_task,
+                                     void *buffer,
+                                     gssize count,
+                                     gpointer user_data)
+{
+    SpiceMainChannel *main_channel;
+    GCancellable *cancellable;
+
+    file_xfer_queue(xfer_task, buffer, count);
+    if (count == 0)
+        return;
+
+    main_channel = spice_file_transfer_task_get_channel(xfer_task);
+    cancellable = spice_file_transfer_task_get_cancellable(xfer_task);
+    file_xfer_flush_async(main_channel, cancellable, file_xfer_data_flushed_cb, xfer_task);
+}
+
 /* main context */
 static void file_xfer_read_cb(GObject *source_object,
                               GAsyncResult *res,
                               gpointer user_data)
 {
     SpiceFileTransferTask *self = user_data;
-    SpiceMainChannel *channel = self->priv->channel;
     gssize count;
     GError *error = NULL;
 
@@ -1930,12 +1918,11 @@ static void file_xfer_read_cb(GObject *source_object,
     if (count > 0 || self->priv->file_size == 0) {
         self->priv->read_bytes += count;
         g_object_notify(G_OBJECT(self), "progress");
-        file_xfer_queue(self, count);
-        if (count == 0)
-            return;
-        file_xfer_flush_async(channel, self->priv->cancellable,
-                              file_xfer_data_flushed_cb, self);
-        self->priv->pending = TRUE;
+
+        if (self->priv->flush_callback) {
+            self->priv->pending = TRUE;
+            self->priv->flush_callback(self, self->priv->buffer, count, self->priv->flush_callback_data);
+        }
     } else if (error) {
         spice_channel_wakeup(SPICE_CHANNEL(self->priv->channel), FALSE);
         spice_file_transfer_task_completed(self, error);
@@ -3083,6 +3070,8 @@ static void file_xfer_send_start_msg_async(SpiceMainChannel *channel,
                                            GCancellable *cancellable,
                                            GFileProgressCallback progress_callback,
                                            gpointer progress_callback_data,
+                                           SpiceFileTransferTaskFlushCb flush_callback,
+                                           gpointer flush_callback_data,
                                            GAsyncReadyCallback callback,
                                            gpointer user_data)
 {
@@ -3102,6 +3091,8 @@ static void file_xfer_send_start_msg_async(SpiceMainChannel *channel,
         task->priv->flags = flags;
         task->priv->progress_callback = progress_callback;
         task->priv->progress_callback_data = progress_callback_data;
+        task->priv->flush_callback = flush_callback;
+        task->priv->flush_callback_data = flush_callback_data;
         task->priv->callback = callback;
         task->priv->user_data = user_data;
 
@@ -3191,6 +3182,8 @@ void spice_main_file_copy_async(SpiceMainChannel *channel,
                                    cancellable,
                                    progress_callback,
                                    progress_callback_data,
+                                   file_xfer_flush_callback,
+                                   NULL,
                                    callback,
                                    user_data);
 }
@@ -3218,6 +3211,66 @@ gboolean spice_main_file_copy_finish(SpiceMainChannel *channel,
     return g_task_propagate_boolean(task, error);
 }
 
+static SpiceMainChannel *spice_file_transfer_task_get_channel(SpiceFileTransferTask *self)
+{
+    g_assert_nonnull(self);
+    return self->priv->channel;
+}
+
+static GCancellable *spice_file_transfer_task_get_cancellable(SpiceFileTransferTask *self)
+{
+    g_assert_nonnull(self);
+    return self->priv->cancellable;
+}
+
+static void spice_file_transfer_task_flush_done(SpiceFileTransferTask *self, GError *error)
+{
+    g_assert_nonnull(self);
+    g_return_if_fail(self->priv->pending);
+
+    self->priv->pending = FALSE;
+
+    if (error || self->priv->error) {
+        spice_file_transfer_task_completed(self, error);
+        return;
+    }
+
+    if (spice_util_get_debug()) {
+        const GTimeSpan interval = 20 * G_TIME_SPAN_SECOND;
+        gint64 now = g_get_monotonic_time();
+
+        if (interval < now - self->priv->last_update) {
+            gchar *basename = g_file_get_basename(self->priv->file);
+            self->priv->last_update = now;
+            SPICE_DEBUG("transferred %.2f%% of the file %s",
+                        100.0 * self->priv->read_bytes / self->priv->file_size, basename);
+            g_free(basename);
+        }
+    }
+
+    if (self->priv->progress_callback) {
+        goffset read = 0;
+        goffset total = 0;
+        SpiceMainChannel *main_channel = self->priv->channel;
+        GHashTableIter iter;
+        gpointer key, value;
+
+        /* since the progress_callback does not have a parameter to indicate
+         * which file the progress is associated with, report progress on all
+         * current transfers */
+        g_hash_table_iter_init(&iter, main_channel->priv->file_xfer_tasks);
+        while (g_hash_table_iter_next(&iter, &key, &value)) {
+            SpiceFileTransferTask *t = (SpiceFileTransferTask *)value;
+            read += t->priv->read_bytes;
+            total += t->priv->file_size;
+        }
+
+        self->priv->progress_callback(read, total, self->priv->progress_callback_data);
+    }
+
+    /* Read more data */
+    file_xfer_continue_read(self);
+}
 
 
 static void
-- 
2.5.5

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