Provide flag to use zap logger

data.go

@@ -80,6 +80,8 @@ type Configuration struct {
 	LetsEncrypt bool     `json:"lets_encrypt"` // start LetsEncrypt HTTPs server
 	DomainNames []string `json:"domain_names"` // list of domain names to use for LetsEncrypt
 
+	ZapLogger string `json:"zap_logger"` // define zap logger usage
+
 	// CouchDB headers, see
 	// https://docs.couchdb.org/en/3.1.2/api/server/authn.html#proxy-authentication
 	XAuthCouchDBUserName string `json:"X-Auth-CouchDB-UserName"` // X-Auth-CouchDB-UserName field of HTTP request

server.go

@@ -51,6 +51,10 @@ func Server(config string, port, metricsPort int, logFile string, useX509, scito
 	// initialize logging module
 	logging.CMSMonitType = Config.MonitType
 	logging.CMSMonitProducer = Config.MonitProducer
+	if Config.ZapLogger != "" {
+		log.Printf("Use zap logger with %s format", Config.ZapLogger)
+		logging.ZapLogger = Config.ZapLogger
+	}
 
 	if port > 0 {
 		log.Println("overwrite server port number to", port)