From 9cb2694409620ae217ede92f78fe45c9eba83504 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Thu, 15 Nov 2012 13:55:04 +0100
Subject: [PATCH] src/configfile.[ch]: Implement the cf_get_default_interval()
 function.

This should be able to replace "interval_g" in a global (i.e. non-plugin)
context, such as the interval in which timeouts are being checked.

The default value (10 seconds) is also configurable at compile time using
a define.
---
 src/collectd.c   | 31 +++++++------------------------
 src/collectd.h   |  4 ++++
 src/configfile.c | 28 ++++++++++++++++++++++++++--
 src/configfile.h |  2 ++
 src/plugin.c     | 16 +---------------
 5 files changed, 40 insertions(+), 41 deletions(-)

diff --git a/src/collectd.c b/src/collectd.c
index c3dc7381..cdb0ee89 100644
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -137,28 +137,10 @@ static int init_hostname (void)
 
 static int init_global_variables (void)
 {
-	const char *str;
-
-	str = global_option_get ("Interval");
-	if (str == NULL)
-	{
-		interval_g = TIME_T_TO_CDTIME_T (10);
-	}
-	else
-	{
-		double tmp;
-
-		tmp = atof (str);
-		if (tmp <= 0.0)
-		{
-			fprintf (stderr, "Cannot set the interval to a "
-					"correct value.\n"
-					"Please check your settings.\n");
-			return (-1);
-		}
+	char const *str;
 
-		interval_g = DOUBLE_TO_CDTIME_T (tmp);
-	}
+	interval_g = cf_get_default_interval ();
+	assert (interval_g > 0);
 	DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
 
 	str = global_option_get ("Timeout");
@@ -323,9 +305,10 @@ static int do_init (void)
 
 static int do_loop (void)
 {
+	cdtime_t interval = cf_get_default_interval ();
 	cdtime_t wait_until;
 
-	wait_until = cdtime () + interval_g;
+	wait_until = cdtime () + interval;
 
 	while (loop == 0)
 	{
@@ -345,12 +328,12 @@ static int do_loop (void)
 			WARNING ("Not sleeping because the next interval is "
 					"%.3f seconds in the past!",
 					CDTIME_T_TO_DOUBLE (now - wait_until));
-			wait_until = now + interval_g;
+			wait_until = now + interval;
 			continue;
 		}
 
 		CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
-		wait_until = wait_until + interval_g;
+		wait_until = wait_until + interval;
 
 		while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
 		{
diff --git a/src/collectd.h b/src/collectd.h
index 4079ad1f..c0994d19 100644
--- a/src/collectd.h
+++ b/src/collectd.h
@@ -258,6 +258,10 @@ typedef int _Bool;
 # define COLLECTD_GRP_NAME "collectd"
 #endif
 
+#ifndef COLLECTD_DEFAULT_INTERVAL
+# define COLLECTD_DEFAULT_INTERVAL 10.0
+#endif
+
 #define STATIC_ARRAY_LEN(array) (sizeof (array) / sizeof ((array)[0]))
 
 /* Remove GNU specific __attribute__ settings when using another compiler */
diff --git a/src/configfile.c b/src/configfile.c
index b09bee8d..e22daf38 100644
--- a/src/configfile.c
+++ b/src/configfile.c
@@ -98,7 +98,7 @@ static cf_global_option_t cf_global_options[] =
 	{"PIDFile",     NULL, PIDFILE},
 	{"Hostname",    NULL, NULL},
 	{"FQDNLookup",  NULL, "true"},
-	{"Interval",    NULL, "10"},
+	{"Interval",    NULL, NULL},
 	{"ReadThreads", NULL, "5"},
 	{"Timeout",     NULL, "2"},
 	{"PreCacheChain",  NULL, "PreCache"},
@@ -265,7 +265,8 @@ static int dispatch_loadplugin (const oconfig_item_t *ci)
 	name = ci->values[0].value.string;
 
 	/* default to the global interval set before loading this plugin */
-	ctx.interval = plugin_get_interval ();
+	memset (&ctx, 0, sizeof (ctx));
+	ctx.interval = cf_get_default_interval ();
 
 	/*
 	 * XXX: Magic at work:
@@ -867,6 +868,29 @@ const char *global_option_get (const char *option)
 			: cf_global_options[i].def);
 } /* char *global_option_get */
 
+cdtime_t cf_get_default_interval (void)
+{
+  char const *str = global_option_get ("Interval");
+  double interval_double = COLLECTD_DEFAULT_INTERVAL;
+
+  if (str != NULL)
+  {
+    char *endptr = NULL;
+    double tmp = strtod (str, &endptr);
+
+    if ((endptr == NULL) || (endptr == str) || (*endptr != 0))
+      ERROR ("cf_get_default_interval: Unable to parse string \"%s\" "
+          "as number.", str);
+    else if (tmp <= 0.0)
+      ERROR ("cf_get_default_interval: Interval must be a positive number. "
+          "The current number is %g.", tmp);
+    else
+      interval_double = tmp;
+  }
+
+  return (DOUBLE_TO_CDTIME_T (interval_double));
+} /* }}} cdtime_t cf_get_default_interval */
+
 void cf_unregister (const char *type)
 {
 	cf_callback_t *this, *prev;
diff --git a/src/configfile.h b/src/configfile.h
index 59ea5542..b44a738c 100644
--- a/src/configfile.h
+++ b/src/configfile.h
@@ -87,6 +87,8 @@ int cf_read (char *filename);
 int global_option_set (const char *option, const char *value);
 const char *global_option_get (const char *option);
 
+cdtime_t cf_get_default_interval (void);
+
 /* Assures the config option is a string, duplicates it and returns the copy in
  * "ret_string". If necessary "*ret_string" is freed first. Returns zero upon
  * success. */
diff --git a/src/plugin.c b/src/plugin.c
index 22f89696..f042b125 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -2074,25 +2074,11 @@ cdtime_t plugin_get_interval (void)
 {
 	cdtime_t interval;
 
-	const char *interval_str;
-	double interval_dbl;
-
 	interval = plugin_get_ctx().interval;
 	if (interval > 0)
 		return interval;
 
-	/* this should happen during initialization only */
-	interval_str = global_option_get ("Interval");
-	if (interval_str != NULL)
-	{
-		interval_dbl = atof (interval_str);
-		if (interval_dbl > 0.0)
-			interval = DOUBLE_TO_CDTIME_T (interval_dbl);
-	}
-
-	if (interval > 0)
-		return interval;
-	return TIME_T_TO_CDTIME_T (10);
+	return cf_get_default_interval ();
 } /* cdtime_t plugin_get_interval */
 
 typedef struct {
-- 
2.11.0