ProcFS tiny changes

- Fixed crash when sensor groups cannot be initialized
- Column metrics for each CPU in /proc/stat are now disambiguated from those found in other lines (like softirq) and they are defined with the "col_" prefix

README.md

@@ -497,16 +497,16 @@ Additionally, sensors in the ProcFS plugin (defined with the "metric" keyword) s
 | perCpu | Boolean. If set to "on", the metric will be collected for each CPU core specified with the "cpus" sensor group parameter, or for all CPU cores if none is specified. Otherwise, the metric will be collected only at system level. This parameter has no effect on metrics that are not acquired at CPU core level (e.g. those in /proc/vmstat and /proc/meminfo).
 
 The "type" field can be inferred for each sensor by simply checking the underlying file parsed by the sensor group. For /proc/stat files, on the other hand, CPU core-related metrics are collected in separate columns, which adopt the following naming scheme that can be used to define sensors: 
-* user 
-* nice 
-* system 
-* idle 
-* iowait
-* irq
-* softirq
-* steal
-* guest
-* guest_nice
+* col_user 
+* col_nice 
+* col_system 
+* col_idle 
+* col_iowait
+* col_irq
+* col_softirq
+* col_steal
+* col_guest
+* col_guest_nice
 
 Additional CPU-related metrics (that may be introduced in future versions of the Linux kernel) are not supported by the DCDB ProcFS plugin.
 

config/procfs.conf

@@ -5,13 +5,13 @@ mqttPrefix    /FF112233445566778899AAB
 template_file def1 {
 interval    1000
 minValues   3
-mqttPart    00
+mqttPart    000
 mqttStart   E0
 }
 
 file meminfo {
 default     def1
-path        /Users/di52bul/dcdb/meminfo
+path        /proc/meminfo
 type        meminfo
 mqttPart    E00
 mqttStart   00
@@ -19,26 +19,26 @@ mqttStart   00
 	metric MemFree {
 	type MemFree
 	mqttsuffix  36
-	skipConstVal true
+	skipConstVal on
 	}
 
 	metric AnonPages {
 	type AnonPages
 	mqttsuffix  AA
-	skipConstVal true
+	skipConstVal on
 	}
 
 	metric Hugepagesize {
 	type Hugepagesize
 	mqttsuffix  BB
-	skipConstVal true
+	skipConstVal on
 	}
 
 }
 
 file vmstat {
 default     def1
-path        /Users/di52bul/dcdb/vmstat
+path        /proc/vmstat
 type        vmstat
 mqttPart    D00
 mqttStart   00
@@ -46,56 +46,56 @@ mqttStart   00
 	metric nr_dirty_threshold {
 	type nr_dirty_threshold
 	mqttsuffix  F0
-	skipConstVal true
+	skipConstVal on
 	}
 
 	metric nr_file_pages {
 	type nr_file_pages
 	mqttsuffix  F1
-	skipConstVal true
+	skipConstVal on
 	}
 
 	metric nr_alloc_batch {
 	type nr_alloc_batch
 	mqttsuffix  F2
-	skipConstVal true
+	skipConstVal on
 	}
 
 }
 
 file procstat {
 default     def1
-path        /Users/di52bul/dcdb/stat
+path        /proc/stat
 type        procstat
 mqttPart    C00
 mqttStart   00
 cpus 		250,36
 
-	metric idle {
-	type idle
+	metric col_idle {
+	type col_idle
 	mqttsuffix  36
-	skipConstVal true
+	skipConstVal on
 	perCpu on
 	}
 
-	metric user {
-	type user
+	metric col_user {
+	type col_user
 	mqttsuffix  37
-	skipConstVal true
+	skipConstVal on
 	perCpu on
 	}
 
-	metric nice {
-	type nice
+	metric col_nice {
+	type col_nice
 	mqttsuffix  38
-	skipConstVal true
+	skipConstVal on
 	perCpu off
 	}
 
 	metric ctxt {
 	type ctxt
 	mqttsuffix  40
-	skipConstVal true
+	skipConstVal on
 	perCpu off
 	}
 

src/sensors/procfs/ProcfsParser.h

@@ -122,7 +122,7 @@ protected:
     boost::cmatch _match;
     // The number of known metrics in each "cpu" line together with their names, as of Oct. 2018
     enum { DEFAULTMETRICS = 10 };
-    const std::string DEFAULT_NAMES[DEFAULTMETRICS] = {"user", "nice", "system", "idle", "iowait", "irq", "softirq", "steal", "guest", "guest_nice"};
+    const std::string DEFAULT_NAMES[DEFAULTMETRICS] = {"col_user", "col_nice", "col_system", "col_idle", "col_iowait", "col_irq", "col_softirq", "col_steal", "col_guest", "col_guest_nice"};
     // Regex to match strings beginning with the "cpu" keyword
 
     // C strings that encode the prefixes of cpu-related lines

src/sensors/procfs/ProcfsSensorGroup.h

@@ -21,7 +21,7 @@ class ProcfsSensorGroup : public SensorGroupTemplate<ProcfsSensorBase> {
     
 public:
     // Constructor and destructor
-    ProcfsSensorGroup(const std::string& name) : SensorGroupTemplate(name) {}
+    ProcfsSensorGroup(const std::string& name) : SensorGroupTemplate(name) { this->_parser = NULL; }
     virtual ~ProcfsSensorGroup();
     
     // Methods inherited from SensorGroupTemplate