nginx: Add json log format

Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/nginx/templates/nginx.conf.j2

@@ -20,6 +20,36 @@ http {
                       '$status $body_bytes_sent "$http_referer" '
                       '"$http_user_agent"';
 
+	log_format json_main escape=json
+		'{'
+		'"remote_addr":"$remote_addr",'
+		'"host":"$host",'
+		'"remote_user":"$remote_user",'
+		'"time_local":"$time_local",'
+		'"request":"$request",'
+		'"status": "$status",'
+		'"body_bytes_sent":"$body_bytes_sent",'
+		'"http_referrer":"$http_referer",'
+		'"http_user_agent":"$http_user_agent",'
+		'"http_x_forwarded_for":"$http_x_forwarded_for",'
+		'"request_time":"$request_time"'
+		'}';
+
+	log_format json_reduced escape=json
+		'{'
+		'"remote_addr":"$remote_addr",'
+		'"host":"$host",'
+		'"remote_user":"$remote_user",'
+		'"time_local":"$time_local",'
+		'"request":"$request",'
+		'"status": "$status",'
+		'"body_bytes_sent":"$body_bytes_sent",'
+		'"http_referrer":"$http_referer",'
+		'"http_user_agent":"$http_user_agent",'
+		'"http_x_forwarded_for":"$http_x_forwarded_for",'
+		'"request_time":"$request_time"'
+		'}';
+
     sendfile        on;
     keepalive_timeout  65;
     client_max_body_size 16M;

roles/zabbix-agent/files/nginx-zabbix.pl

@@ -84,6 +84,11 @@ sub main {
 		#print "Got line: ".$line."\n";
 		$line = trim($line);
 
+		# json log format
+		if ($line =~ m/^{.*}$/) {
+			update_stats_for_line($values_per_host, $stat_per_host, $value_template, \$modified_hostlist, decode_json($line));
+		}
+
 		# main log format
 		if ($line =~ m/(?<remote_addr>\S+) (?<host>\S+) (?<remote_user>\S+) \[(?<time_local>.*?)\]\s+"(?<request>.*?)" (?<status>\S+) (?<body_bytes_sent>\S+) "(?<http_referer>.*?)" "(?<http_user_agent>.*?)" "(?<http_x_forwarded_for>\S+)"(?: (?<request_time>[\d\.]+|-))?/) {
 			update_stats_for_line($values_per_host, $stat_per_host, $value_template, \$modified_hostlist, \%+);