fix: make date_format optional and fix panic

terraform/docs/extractor.md

@@ -27,7 +27,6 @@ condition_type | string |
 extractor_config | object{} |
 converters[].type | string |
 converters[].config | object{} |
-converters[].config.date_format | string | "" |
 
 ### Common Optional Argument
 
@@ -37,6 +36,7 @@ converters | list | [] |
 target_field | string | "" |
 condition_value | string | "" |
 order | int | 0 |
+converters[].config.date_format | string | "" |
 converters[].config.time_zone | string | "" |
 converters[].config.locale | string | "" |
 

terraform/example/v0.12/extractor.tf

@@ -60,3 +60,24 @@ resource "graylog_extractor" "test_regex" {
     }
   }
 }
+
+resource "graylog_extractor" "http_response_code" {
+  input_id        = graylog_input.gelf_udp.id
+  title           = "Apache http_response_code"
+  type            = "regex"
+  cursor_strategy = "copy"
+  source_field    = "message"
+  target_field    = "http_response_code"
+  condition_type  = "regex"
+  condition_value = "[1-5]\\d{2}"
+  order           = 0
+
+  converters {
+    type = "numeric"
+    config {}
+  }
+
+  regex_type_extractor_config {
+    regex_value = "HTTP/1.[0-1]\" (\\d{3}) "
+  }
+}

terraform/graylog/resource_extractor.go

@@ -174,7 +174,7 @@ func resourceExtractor() *schema.Resource {
 								Schema: map[string]*schema.Schema{
 									"date_format": {
 										Type:     schema.TypeString,
-										Required: true,
+										Optional: true,
 									},
 									"time_zone": {
 										Type:     schema.TypeString,
@@ -236,14 +236,18 @@ func newExtractor(d *schema.ResourceData) (*graylog.Extractor, string, error) {
 	converters := make([]graylog.ExtractorConverter, len(list))
 	for i, a := range list {
 		b := a.(map[string]interface{})
-		cfg := b["config"].([]interface{})[0].(map[string]interface{})
+		c := b["config"].([]interface{})
+		cfg := &graylog.ExtractorConverterConfig{}
+		if len(c) > 0 {
+			if d, ok := c[0].(map[string]interface{}); ok {
+				cfg.DateFormat = d["date_format"].(string)
+				cfg.TimeZone = d["time_zone"].(string)
+				cfg.Locale = d["locale"].(string)
+			}
+		}
 		converters[i] = graylog.ExtractorConverter{
-			Type: b["type"].(string),
-			Config: &graylog.ExtractorConverterConfig{
-				DateFormat: cfg["date_format"].(string),
-				TimeZone:   cfg["time_zone"].(string),
-				Locale:     cfg["locale"].(string),
-			},
+			Type:   b["type"].(string),
+			Config: cfg,
 		}
 	}
 	return &graylog.Extractor{