[sysprof] libsysprof: start on battery charge capture

[Christian Hergert <chergert src gnome org>]

commit 1d0a269b80f2369e49539345f9fb49cef2a7b71f
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 10 15:40:26 2019 -0700

    libsysprof: start on battery charge capture

 src/libsysprof-ui/ui/sysprof-profiler-assistant.ui |  14 +
 src/libsysprof/meson.build                         |   2 +
 src/libsysprof/sysprof-battery-source.c            | 304 +++++++++++++++++++++
 src/libsysprof/sysprof-battery-source.h            |  35 +++
 src/libsysprof/sysprof.h                           |   1 +
 5 files changed, 356 insertions(+)
---
diff --git a/src/libsysprof-ui/ui/sysprof-profiler-assistant.ui 
b/src/libsysprof-ui/ui/sysprof-profiler-assistant.ui
index 699a796..03cfe3f 100644
--- a/src/libsysprof-ui/ui/sysprof-profiler-assistant.ui
+++ b/src/libsysprof-ui/ui/sysprof-profiler-assistant.ui
@@ -43,6 +43,13 @@
       </object>
     </child>
   </object>
+  <object class="SysprofAid" id="battery_aid">
+    <property name="display-name">Battery</property>
+    <property name="icon-name">battery-low-charging-symbolic</property>
+    <child>
+      <object class="SysprofBatterySource"/>
+    </child>
+  </object>
   <template class="SysprofProfilerAssistant" parent="GtkBin">
     <child>
       <object class="GtkScrolledWindow">
@@ -140,6 +147,13 @@
                             <property name="visible">true</property>
                           </object>
                         </child>
+                        <child>
+                          <object class="SysprofAidIcon">
+                            <property name="aid">battery_aid</property>
+                            <property name="selected">false</property>
+                            <property name="visible">true</property>
+                          </object>
+                        </child>
                       </object>
                     </child>
                   </object>
diff --git a/src/libsysprof/meson.build b/src/libsysprof/meson.build
index 32f4552..2968cc2 100644
--- a/src/libsysprof/meson.build
+++ b/src/libsysprof/meson.build
@@ -3,6 +3,7 @@ if get_option('libsysprof')
 libsysprof_c_args = [ '-DSYSPROF_COMPILATION' ]
 
 libsysprof_public_sources = [
+  'sysprof-battery-source.c',
   'sysprof-callgraph-profile.c',
   'sysprof-capture-gobject.c',
   'sysprof-capture-symbol-resolver.c',
@@ -27,6 +28,7 @@ libsysprof_public_sources = [
 ]
 
 libsysprof_public_headers = [
+  'sysprof-battery-source.h',
   'sysprof-callgraph-profile.h',
   'sysprof-capture-gobject.h',
   'sysprof-capture-symbol-resolver.h',
diff --git a/src/libsysprof/sysprof-battery-source.c b/src/libsysprof/sysprof-battery-source.c
new file mode 100644
index 0000000..82824da
--- /dev/null
+++ b/src/libsysprof/sysprof-battery-source.c
@@ -0,0 +1,304 @@
+/* sysprof-battery-source.c
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define G_LOG_DOMAIN "sysprof-battery-source"
+
+#include "config.h"
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "sysprof-battery-source.h"
+#include "sysprof-helpers.h"
+
+struct _SysprofBatterySource
+{
+  GObject               parent_instance;
+
+  SysprofCaptureWriter *writer;
+  GArray               *batteries;
+
+  guint                 poll_source;
+};
+
+typedef struct
+{
+  gchar id[32];
+  gchar name[52];
+  guint charge_full;
+  guint charge_now;
+  gint  charge_now_fd;
+  guint counter_id;
+} Battery;
+
+static void source_iface_init (SysprofSourceInterface *);
+
+G_DEFINE_TYPE_WITH_CODE (SysprofBatterySource, sysprof_battery_source, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (SYSPROF_TYPE_SOURCE, source_iface_init))
+
+static void
+battery_clear (gpointer data)
+{
+  Battery *b = data;
+
+  if (b->charge_now_fd != -1)
+    close (b->charge_now_fd);
+}
+
+static gboolean
+sysprof_battery_source_get_is_ready (SysprofSource *source)
+{
+  return TRUE;
+}
+
+static void
+sysprof_battery_source_prepare (SysprofSource *source)
+{
+  SysprofBatterySource *self = (SysprofBatterySource *)source;
+  g_autoptr(GDir) dir = NULL;
+  g_autoptr(GArray) counters = NULL;
+  const gchar *name;
+
+  g_assert (SYSPROF_IS_BATTERY_SOURCE (self));
+
+#define BAT_BASE_PATH "/sys/class/power_supply/"
+
+  counters = g_array_new (FALSE, FALSE, sizeof (SysprofCaptureCounter));
+
+  if (!(dir = g_dir_open (BAT_BASE_PATH, 0, NULL)))
+    goto emit_ready;
+
+  while ((name = g_dir_read_name (dir)))
+    {
+      g_autofree gchar *type_path = g_strdup_printf (BAT_BASE_PATH "%s/type", name);
+      g_autofree gchar *model_path = g_strdup_printf (BAT_BASE_PATH "%s/model_name", name);
+      g_autofree gchar *charge_now_path = g_strdup_printf (BAT_BASE_PATH "%s/charge_now", name);
+      g_autofree gchar *charge_full_path = g_strdup_printf (BAT_BASE_PATH "%s/charge_full", name);
+      g_autofree gchar *type_data = NULL;
+      g_autofree gchar *model_data = NULL;
+      g_autofree gchar *charge_full_data = NULL;
+      g_autofree gchar *charge_now_data = NULL;
+      SysprofCaptureCounter ctr;
+      Battery bat = {0};
+
+      /* We dn't care about AC */
+      if (g_strcmp0 (name, "AC") == 0)
+        continue;
+
+      if (!g_file_get_contents (type_path, &type_data, NULL, NULL) ||
+          !g_str_has_prefix (type_data, "Battery"))
+        continue;
+
+      g_strlcpy (bat.id, name, sizeof bat.id);
+
+      if (g_file_get_contents (model_path, &model_data, NULL, NULL))
+        g_strlcpy (bat.name, model_data, sizeof bat.name);
+
+      if (g_file_get_contents (charge_full_path, &charge_full_data, NULL, NULL))
+        bat.charge_full = atoi (charge_full_data);
+
+      if (g_file_get_contents (charge_now_path, &charge_now_data, NULL, NULL))
+        bat.charge_now = atoi (charge_now_data);
+
+      g_strstrip (bat.id);
+      g_strstrip (bat.name);
+
+      bat.charge_now_fd = open (charge_now_path, O_RDONLY);
+
+      if (bat.charge_now_fd == -1)
+        continue;
+
+      bat.counter_id = sysprof_capture_writer_request_counter (self->writer, 1);
+
+      g_strlcpy (ctr.category, "Battery Change", sizeof ctr.category);
+      g_strlcpy (ctr.name, bat.id, sizeof ctr.name);
+      g_strlcpy (ctr.description, bat.name, sizeof ctr.description);
+      ctr.id = bat.counter_id;
+      ctr.type = SYSPROF_CAPTURE_COUNTER_INT64;
+
+      g_array_append_val (self->batteries, bat);
+      g_array_append_val (counters, ctr);
+    }
+
+  if (counters->len)
+    sysprof_capture_writer_define_counters (self->writer,
+                                            SYSPROF_CAPTURE_CURRENT_TIME,
+                                            -1,
+                                            -1,
+                                            (gpointer)counters->data,
+                                            counters->len);
+
+#undef BAT_BASE_PATH
+
+emit_ready:
+  sysprof_source_emit_ready (source);
+}
+
+static gboolean
+battery_poll (Battery                    *battery,
+              SysprofCaptureCounterValue *value)
+{
+  gssize len;
+  gchar buf[32];
+
+  g_assert (battery != NULL);
+
+  if (battery->charge_now_fd == -1)
+    return FALSE;
+
+  if (lseek (battery->charge_now_fd, 0, SEEK_SET) != 0)
+    {
+      close (battery->charge_now_fd);
+      battery->charge_now_fd = -1;
+      return FALSE;
+    }
+
+  len = read (battery->charge_now_fd, buf, sizeof buf - 1);
+
+  if (len < 0)
+    {
+      close (battery->charge_now_fd);
+      battery->charge_now_fd = -1;
+      return FALSE;
+    }
+
+  buf [len] = 0;
+
+  battery->charge_now = atoi (buf);
+
+  value->v64 = battery->charge_now;
+
+  return TRUE;
+}
+
+static gboolean
+sysprof_battery_source_poll_cb (gpointer data)
+{
+  SysprofBatterySource *self = data;
+  g_autoptr(GArray) values = NULL;
+  g_autoptr(GArray) ids = NULL;
+
+  g_assert (SYSPROF_IS_BATTERY_SOURCE (self));
+
+  values = g_array_new (FALSE, FALSE, sizeof (SysprofCaptureCounterValue));
+  ids = g_array_new (FALSE, FALSE, sizeof (guint));
+
+  for (guint i = 0; i < self->batteries->len; i++)
+    {
+      Battery *battery = &g_array_index (self->batteries, Battery, i);
+      SysprofCaptureCounterValue value;
+
+      if G_LIKELY (battery_poll (battery, &value))
+        {
+          g_array_append_val (ids, battery->counter_id);
+          g_array_append_val (values, value);
+        }
+    }
+
+  if (values->len > 0)
+    sysprof_capture_writer_set_counters (self->writer,
+                                         SYSPROF_CAPTURE_CURRENT_TIME,
+                                         -1,
+                                         -1,
+                                         (gconstpointer)ids->data,
+                                         (gconstpointer)values->data,
+                                         ids->len);
+
+  return G_SOURCE_CONTINUE;
+}
+
+static void
+sysprof_battery_source_start (SysprofSource *source)
+{
+  SysprofBatterySource *self = (SysprofBatterySource *)source;
+
+  self->poll_source = g_timeout_add_seconds (1, sysprof_battery_source_poll_cb, self);
+
+  g_assert (SYSPROF_IS_BATTERY_SOURCE (self));
+
+}
+
+static void
+sysprof_battery_source_stop (SysprofSource *source)
+{
+  SysprofBatterySource *self = (SysprofBatterySource *)source;
+
+  g_assert (SYSPROF_IS_BATTERY_SOURCE (self));
+
+  g_clear_handle_id (&self->poll_source, g_source_remove);
+
+  sysprof_source_emit_finished (source);
+}
+
+static void
+sysprof_battery_source_set_writer (SysprofSource        *source,
+                                   SysprofCaptureWriter *writer)
+{
+  SysprofBatterySource *self = (SysprofBatterySource *)source;
+
+  g_assert (SYSPROF_IS_BATTERY_SOURCE (self));
+  g_assert (writer != NULL);
+
+  g_clear_pointer (&self->writer, sysprof_capture_writer_unref);
+  self->writer = sysprof_capture_writer_ref (writer);
+}
+
+static void
+source_iface_init (SysprofSourceInterface *iface)
+{
+  iface->get_is_ready = sysprof_battery_source_get_is_ready;
+  iface->prepare = sysprof_battery_source_prepare;
+  iface->set_writer = sysprof_battery_source_set_writer;
+  iface->start = sysprof_battery_source_start;
+  iface->stop = sysprof_battery_source_stop;
+}
+
+static void
+sysprof_battery_source_finalize (GObject *object)
+{
+  SysprofBatterySource *self = (SysprofBatterySource *)object;
+
+  g_clear_pointer (&self->batteries, g_array_unref);
+  g_clear_pointer (&self->writer, sysprof_capture_writer_unref);
+
+  G_OBJECT_CLASS (sysprof_battery_source_parent_class)->finalize (object);
+}
+
+static void
+sysprof_battery_source_class_init (SysprofBatterySourceClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = sysprof_battery_source_finalize;
+}
+
+static void
+sysprof_battery_source_init (SysprofBatterySource *self)
+{
+  self->batteries = g_array_new (FALSE, FALSE, sizeof (Battery));
+  g_array_set_clear_func (self->batteries, battery_clear);
+}
+
+SysprofSource *
+sysprof_battery_source_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_SOURCE, NULL);
+}
diff --git a/src/libsysprof/sysprof-battery-source.h b/src/libsysprof/sysprof-battery-source.h
new file mode 100644
index 0000000..468169f
--- /dev/null
+++ b/src/libsysprof/sysprof-battery-source.h
@@ -0,0 +1,35 @@
+/* sysprof-battery-source.h
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "sysprof-source.h"
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_BATTERY_SOURCE (sysprof_battery_source_get_type())
+
+SYSPROF_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (SysprofBatterySource, sysprof_battery_source, SYSPROF, BATTERY_SOURCE, GObject)
+
+SYSPROF_AVAILABLE_IN_ALL
+SysprofSource *sysprof_battery_source_new (void);
+
+G_END_DECLS
diff --git a/src/libsysprof/sysprof.h b/src/libsysprof/sysprof.h
index 867c35b..213e03a 100644
--- a/src/libsysprof/sysprof.h
+++ b/src/libsysprof/sysprof.h
@@ -24,6 +24,7 @@ G_BEGIN_DECLS
 
 #define SYSPROF_INSIDE
 
+# include "sysprof-battery-source.h"
 # include "sysprof-callgraph-profile.h"
 # include "sysprof-capture-gobject.h"
 # include "sysprof-capture-symbol-resolver.h"