[gnome-documents] loader: try to load gdocs from the last saved cache as a fallback

[Cosimo Cecchi <cosimoc src gnome org>]

commit 965bf0c10b80af301a40d422a36bdbae6e8f83fd
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Sep 6 17:26:57 2011 -0400

    loader: try to load gdocs from the last saved cache as a fallback
    
    E.g. if we have no network, we still want to see the last saved cache,
    if any. To do this, we need to change the saved name of the cache to
    hash the document-id instead of the entry id, since this last one could
    have multiple valid values for each document entity.

 src/documents.js        |   14 ++++++++++++-
 src/lib/gd-pdf-loader.c |   50 +++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 57 insertions(+), 7 deletions(-)
---
diff --git a/src/documents.js b/src/documents.js
index 9b12b14..239c59c 100644
--- a/src/documents.js
+++ b/src/documents.js
@@ -422,7 +422,19 @@ GoogleDocument.prototype = {
         this._createGDataEntry(cancellable, Lang.bind(this,
             function(entry, service, exception) {
                 if (exception) {
-                    Global.errorHandler.addLoadError(this, exception);
+                    // try loading from the most recent cache, if any
+                    Gd.pdf_loader_load_uri_async(this.identifier, cancellable, Lang.bind(this,
+                        function(source, res) {
+                            try {
+                                let document = Gd.pdf_loader_load_uri_finish(res);
+                                callback(document);
+                            } catch (e) {
+                                // report the outmost error only
+                                Global.errorHandler.addLoadError(this, exception);
+                                return;
+                            }
+                        }));
+
                     return;
                 }
 
diff --git a/src/lib/gd-pdf-loader.c b/src/lib/gd-pdf-loader.c
index 5c05dc1..11c6795 100644
--- a/src/lib/gd-pdf-loader.c
+++ b/src/lib/gd-pdf-loader.c
@@ -41,6 +41,7 @@ typedef struct {
   GDataDownloadStream *stream;
   GDataEntry *gdata_entry;
   GDataService *gdata_service;
+  gchar *document_id;
 
   guint64 pdf_cache_mtime;
   guint64 original_file_mtime;
@@ -112,6 +113,7 @@ pdf_load_job_free (PdfLoadJob *job)
   g_clear_object (&job->gdata_entry);
 
   g_free (job->uri);
+  g_free (job->document_id);
 
   if (job->pdf_path != NULL) {
     if (job->unlink_cache)
@@ -377,8 +379,8 @@ pdf_load_job_from_google_documents (PdfLoadJob *job)
 
   job->original_file_mtime = gdata_entry_get_updated (job->gdata_entry);
 
-  tmp_name = g_strdup_printf ("gnome-documents-%d.pdf", 
-                              g_str_hash (gdata_entry_get_id (job->gdata_entry)));
+  tmp_name = g_strdup_printf ("gnome-documents-%u.pdf", 
+                              g_str_hash (gdata_documents_entry_get_document_id (GDATA_DOCUMENTS_ENTRY (job->gdata_entry))));
   tmp_path = g_build_filename (g_get_user_cache_dir (), "gnome-documents", NULL);
   job->pdf_path = pdf_path =
     g_build_filename (tmp_path, tmp_name, NULL);
@@ -400,6 +402,24 @@ pdf_load_job_from_google_documents (PdfLoadJob *job)
 }
 
 static void
+pdf_load_job_from_gdata_cache (PdfLoadJob *job)
+{
+  gchar *tmp_name;
+  gchar *tmp_path;
+  GFile *pdf_file;
+
+  tmp_name = g_strdup_printf ("gnome-documents-%u.pdf", 
+                              g_str_hash (job->document_id));
+  tmp_path = g_build_filename (g_get_user_cache_dir (), "gnome-documents", NULL);
+  job->pdf_path = g_build_filename (tmp_path, tmp_name, NULL);
+
+  pdf_load_job_from_pdf (job);
+
+  g_free (tmp_path);
+  g_free (tmp_name);
+}
+
+static void
 unoconv_child_watch_cb (GPid pid,
                         gint status,
                         gpointer user_data)
@@ -544,7 +564,7 @@ pdf_load_job_from_openoffice (PdfLoadJob *job)
   gchar *pdf_path, *tmp_name, *tmp_path;
   GFile *cache_file;
 
-  tmp_name = g_strdup_printf ("gnome-documents-%d.pdf", g_str_hash (job->uri));
+  tmp_name = g_strdup_printf ("gnome-documents-%u.pdf", g_str_hash (job->uri));
   tmp_path = g_build_filename (g_get_user_cache_dir (), "gnome-documents", NULL);
   job->pdf_path = pdf_path =
     g_build_filename (tmp_path, tmp_name, NULL);
@@ -593,11 +613,30 @@ query_info_ready_cb (GObject *obj,
   g_object_unref (info);
 }
 
+static gchar *
+document_id_from_entry_id (const gchar *entry_id)
+{
+  const gchar *ptr;
+
+  ptr = g_strrstr (entry_id, "%3A");
+
+  if (ptr)
+    return g_strdup (ptr + 3);
+
+  return g_strdup (entry_id);
+}
+
 static void
 pdf_load_job_from_regular_file (PdfLoadJob *job)
 {
   GFile *file;
 
+  if (g_str_has_prefix (job->uri, "https://docs.google.com";)) {
+    job->document_id = document_id_from_entry_id (job->uri);
+    pdf_load_job_from_gdata_cache (job);
+    return;
+  }
+
   file = g_file_new_for_uri (job->uri);
   g_file_query_info_async (file,
                            G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
@@ -613,11 +652,10 @@ pdf_load_job_from_regular_file (PdfLoadJob *job)
 static void
 pdf_load_job_start (PdfLoadJob *job)
 {
-  if (job->gdata_entry != NULL) {
+  if (job->gdata_entry != NULL)
     pdf_load_job_from_google_documents (job);
-  } else {
+  else
     pdf_load_job_from_regular_file (job);
-  }
 }
 
 void