Add configuration option to print logs (#134)

Author: stempler

README.adoc

@@ -274,6 +274,9 @@ namespace "app1" {
     ]
   }
 
+  # log can be printed to std out, e.g. for debugging purposes (disabled by default)
+  print_log = false
+
   # metrics_override = { prefix = "myprefix" }
   # namespace_label = "vhost"
 

config/struct_namespace.go

@@ -24,6 +24,8 @@ type NamespaceConfig struct {
 	RelabelConfigs   []RelabelConfig   `hcl:"relabel" yaml:"relabel_configs"`
 	HistogramBuckets []float64         `hcl:"histogram_buckets" yaml:"histogram_buckets"`
 
+	PrintLog bool `hcl:"print_log" yaml:"print_log"`
+
 	OrderedLabelNames  []string
 	OrderedLabelValues []string
 }

main.go

@@ -339,6 +339,10 @@ func processSource(nsCfg config.NamespaceConfig, t tail.Follower, parser *gonx.P
 	}
 
 	for line := range t.Lines() {
+		if nsCfg.PrintLog {
+			fmt.Println(line)
+		}
+
 		entry, err := parser.ParseString(line)
 		if err != nil {
 			fmt.Printf("error while parsing line '%s': %s\n", line, err)