metrics-probe/filterx: implement update_metric()

Signed-off-by: Attila Szakacs <[email protected]>

modules/metrics-probe/filterx/func-update-metric.c

@@ -22,3 +22,196 @@
  */
 
 #include "func-update-metric.h"
+#include "filterx/filterx-metrics.h"
+#include "filterx/expr-literal.h"
+#include "filterx/filterx-eval.h"
+#include "filterx/object-primitive.h"
+#include "stats/stats.h"
+
+#define FILTERX_FUNC_UPDATE_METRIC_USAGE "update_metric(\"key\", labels={\"key\": \"value\"}, increment=1, level=0)"
+
+typedef struct FilterXFunctionUpdateMetric_
+{
+  FilterXFunction super;
+  FilterXMetrics *metrics;
+  gint level;
+
+  struct
+  {
+    FilterXExpr *expr;
+    gint64 value;
+  } increment;
+} FilterXFunctionUpdateMetric;
+
+static gboolean
+_get_increment(FilterXFunctionUpdateMetric *self, gint64 *increment)
+{
+  if (!self->increment.expr)
+    {
+      *increment = self->increment.value;
+      return TRUE;
+    }
+
+  FilterXObject *increment_obj = filterx_expr_eval_typed(self->increment.expr);
+  if (!increment_obj)
+    return FALSE;
+
+  gboolean success = filterx_integer_unwrap(increment_obj, increment);
+  if (!success)
+    filterx_eval_push_error("metric increment must be an integer", self->increment.expr, increment_obj);
+
+  filterx_object_unref(increment_obj);
+  return success;
+}
+
+static FilterXObject *
+_eval(FilterXExpr *s)
+{
+  FilterXFunctionUpdateMetric *self = (FilterXFunctionUpdateMetric *) s;
+
+  gboolean success = FALSE;
+
+  gint64 increment;
+  if (!_get_increment(self, &increment))
+    goto exit;
+
+  StatsCounterItem *counter = filterx_metrics_get_stats_counter(self->metrics);
+  if (!counter)
+    goto exit;
+
+  stats_counter_add(counter, increment);
+  success = TRUE;
+
+exit:
+  if (!success)
+    {
+      msg_error("FilterX: Failed to process update_metric()", filterx_format_last_error());
+      filterx_eval_clear_errors();
+    }
+
+  return filterx_boolean_new(TRUE);
+}
+
+static void
+_free(FilterXExpr *s)
+{
+  FilterXFunctionUpdateMetric *self = (FilterXFunctionUpdateMetric *) s;
+
+  if (self->metrics)
+    filterx_metrics_free(self->metrics);
+  filterx_expr_unref(self->increment.expr);
+
+  filterx_function_free_method(&self->super);
+}
+
+static gboolean
+_extract_increment_arg(FilterXFunctionUpdateMetric *self, FilterXFunctionArgs *args, GError **error)
+{
+  self->increment.value = 1;
+  self->increment.expr = filterx_function_args_get_named_expr(args, "increment");
+
+  if (self->increment.expr && filterx_expr_is_literal(self->increment.expr))
+    {
+      FilterXObject *increment_obj = filterx_expr_eval_typed(self->increment.expr);
+      if (!increment_obj)
+        {
+          g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
+                      "failed to evaluate increment. " FILTERX_FUNC_UPDATE_METRIC_USAGE);
+          return FALSE;
+        }
+
+      gboolean success = filterx_integer_unwrap(increment_obj, &self->increment.value);
+      filterx_object_unref(increment_obj);
+      if (!success)
+        {
+          g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
+                      "failed to set increment, increment must be integer. " FILTERX_FUNC_UPDATE_METRIC_USAGE);
+          return FALSE;
+        }
+
+      filterx_expr_unref(self->increment.expr);
+      self->increment.expr = NULL;
+    }
+
+  return TRUE;
+}
+
+static gboolean
+_extract_level_arg(FilterXFunctionUpdateMetric *self, FilterXFunctionArgs *args, GError **error)
+{
+  gboolean exists;
+  gboolean arg_error;
+  self->level = filterx_function_args_get_named_literal_integer(args, "level", &exists, &arg_error);
+
+  if (arg_error)
+    {
+      g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
+                  "failed to set level, level must be a literal integer. " FILTERX_FUNC_UPDATE_METRIC_USAGE);
+      return FALSE;
+    }
+
+  if (!exists)
+    self->level = STATS_LEVEL0;
+
+  return TRUE;
+}
+
+static gboolean
+_init_metrics(FilterXFunctionUpdateMetric *self, FilterXFunctionArgs *args, GError **error)
+{
+  FilterXExpr *key = filterx_function_args_get_expr(args, 0);
+  FilterXExpr *labels = filterx_function_args_get_named_expr(args, "labels");
+
+  self->metrics = filterx_metrics_new(0, key, labels);
+
+  filterx_expr_unref(key);
+  filterx_expr_unref(labels);
+
+  return !!self->metrics;
+}
+
+static gboolean
+_extract_args(FilterXFunctionUpdateMetric *self, FilterXFunctionArgs *args, GError **error)
+{
+  if (filterx_function_args_len(args) != 1)
+    {
+      g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
+                  "invalid number of arguments. " FILTERX_FUNC_UPDATE_METRIC_USAGE);
+      return FALSE;
+    }
+
+  if (!_extract_increment_arg(self, args, error))
+    return FALSE;
+
+  if (!_extract_level_arg(self, args, error))
+    return FALSE;
+
+  if (!_init_metrics(self, args, error))
+    return FALSE;
+
+  return TRUE;
+}
+
+FilterXFunction *
+filterx_function_update_metric_new(const gchar *function_name, FilterXFunctionArgs *args, GError **error)
+{
+  FilterXFunctionUpdateMetric *self = g_new0(FilterXFunctionUpdateMetric, 1);
+  filterx_function_init_instance(&self->super, function_name);
+
+  self->super.super.eval = _eval;
+  self->super.super.free_fn = _free;
+
+  if (!_extract_args(self, args, error) ||
+      !filterx_function_args_check(args, error))
+    goto error;
+
+  filterx_function_args_free(args);
+  return &self->super;
+
+error:
+  filterx_function_args_free(args);
+  filterx_expr_unref(&self->super.super);
+  return NULL;
+}
+
+FILTERX_FUNCTION(update_metric, filterx_function_update_metric_new);

modules/metrics-probe/metrics-probe-plugin.c

@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2023 Attila Szakacs
+ * Copyright (c) 2024 Axoflow
+ * Copyright (c) 2023-2024 Attila Szakacs <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
@@ -23,6 +24,7 @@
 #include "cfg-parser.h"
 #include "plugin.h"
 #include "plugin-types.h"
+#include "filterx/func-update-metric.h"
 
 extern CfgParser metrics_probe_parser;
 
@@ -33,6 +35,7 @@ static Plugin metrics_probe_plugins[] =
     .name = "metrics-probe",
     .parser = &metrics_probe_parser,
   },
+  FILTERX_FUNCTION_PLUGIN(update_metric),
 };
 
 gboolean