[tracker-miners/wip/carlosg/cli-improvements: 2/30] libtracker-miners-common: Add error storage infrastructure

[Carlos Garnacho <carlosg src gnome org>]

commit 21aa1c4b76b8f871bcdab6c89e1719f1fef423e3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Aug 16 11:46:48 2020 +0200

    libtracker-miners-common: Add error storage infrastructure
    
    Instead of logging things on stderr and asking users to look for it,
    we are going for a coredumpctl-alike approach, where we persistently
    log the errors in a way that can be quickly looked up and inspected
    by the user.
    
    This adds the lowlevel bits, so it is possible to store these errors.

 src/libtracker-miners-common/meson.build           |   1 +
 src/libtracker-miners-common/tracker-common.h      |   1 +
 .../tracker-error-report.c                         | 103 +++++++++++++++++++++
 .../tracker-error-report.h                         |  34 +++++++
 4 files changed, 139 insertions(+)
---
diff --git a/src/libtracker-miners-common/meson.build b/src/libtracker-miners-common/meson.build
index 2b6590b70..7868f8623 100644
--- a/src/libtracker-miners-common/meson.build
+++ b/src/libtracker-miners-common/meson.build
@@ -11,6 +11,7 @@ tracker_miners_common_sources = [
   'tracker-dbus.c',
   'tracker-domain-ontology.c',
   'tracker-debug.c',
+  'tracker-error-report.c',
   'tracker-file-utils.c',
   'tracker-fts-config.c',
   'tracker-ioprio.c',
diff --git a/src/libtracker-miners-common/tracker-common.h b/src/libtracker-miners-common/tracker-common.h
index dcf52f587..1d4f364c4 100644
--- a/src/libtracker-miners-common/tracker-common.h
+++ b/src/libtracker-miners-common/tracker-common.h
@@ -33,6 +33,7 @@
 #include "tracker-debug.h"
 #include "tracker-domain-ontology.h"
 #include "tracker-enums.h"
+#include "tracker-error-report.h"
 #include "tracker-file-utils.h"
 #include "tracker-fts-config.h"
 #include "tracker-ioprio.h"
diff --git a/src/libtracker-miners-common/tracker-error-report.c 
b/src/libtracker-miners-common/tracker-error-report.c
new file mode 100644
index 000000000..501c2c634
--- /dev/null
+++ b/src/libtracker-miners-common/tracker-error-report.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020, Red Hat Ltd
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ * Author: Carlos Garnacho <carlosg gnome org>
+ */
+
+#include "tracker-error-report.h"
+
+#include <glib/gstdio.h>
+
+#define GROUP "Report"
+#define KEY_URI "Uri"
+#define KEY_MESSAGE "Message"
+#define KEY_SPARQL "Sparql"
+
+static gchar *report_dir = NULL;
+
+void
+tracker_error_report_init (GFile *cache_dir)
+{
+       GFile *report_file;
+
+       report_file = g_file_get_child (cache_dir, "errors");
+       report_dir = g_file_get_path (report_file);
+       g_mkdir_with_parents (report_dir, 0600);
+       g_object_unref (report_file);
+}
+
+static gchar *
+get_report_file (const gchar *uri)
+{
+       gchar *md5, *report_file;
+
+       md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, uri, -1);
+       report_file = g_build_filename (report_dir, md5, NULL);
+       g_free (md5);
+
+       return report_file;
+}
+
+void
+tracker_error_report (GFile       *file,
+                      const gchar *error_message,
+                      const gchar *sparql)
+{
+       GKeyFile *key_file;
+       gchar *report_path, *uri;
+       GError *error = NULL;
+
+       if (!report_dir)
+               return;
+
+       uri = g_file_get_uri (file);
+       report_path = get_report_file (uri);
+       key_file = g_key_file_new ();
+       g_key_file_set_string (key_file, GROUP, KEY_URI, uri);
+
+       if (error_message)
+               g_key_file_set_string (key_file, GROUP, KEY_MESSAGE, error_message);
+
+       if (sparql)
+               g_key_file_set_string (key_file, GROUP, KEY_SPARQL, sparql);
+
+       if (!g_key_file_save_to_file (key_file, report_path, &error)) {
+               g_warning ("Could not save error report: %s\n", error->message);
+               g_error_free (error);
+       }
+
+       g_key_file_unref (key_file);
+       g_free (report_path);
+       g_free (uri);
+}
+
+void
+tracker_error_report_delete (GFile *file)
+{
+       gchar *uri, *report_path;
+
+       if (!report_dir)
+               return;
+
+       uri = g_file_get_uri (file);
+       report_path = get_report_file (uri);
+       g_remove (report_path);
+
+       g_free (report_path);
+       g_free (uri);
+}
diff --git a/src/libtracker-miners-common/tracker-error-report.h 
b/src/libtracker-miners-common/tracker-error-report.h
new file mode 100644
index 000000000..c69a5e934
--- /dev/null
+++ b/src/libtracker-miners-common/tracker-error-report.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2020, Red Hat Ltd
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ * Author: Carlos Garnacho <carlosg gnome org>
+ */
+
+#ifndef __TRACKER_ERROR_REPORT_H__
+#define __TRACKER_ERROR_REPORT_H__
+
+#include <gio/gio.h>
+
+void tracker_error_report_init (GFile *cache_dir);
+
+void tracker_error_report (GFile       *file,
+                           const gchar *error_message,
+                           const gchar *sparql);
+void tracker_error_report_delete (GFile *file);
+
+#endif /* __TRACKER_ERROR_REPORT_H__ */