[FAB-5800] Allow orderer to set LogFormat backport

The orderer's logs always print using the default format string which
includes colors in the output.  Although helpful when looking at a
console, this makes logs difficult to handle programatically.

This CR adds a LogFormat option to orderer.yaml and uses it to
initialize the logging format for the orderer.

Change-Id: I7c595aa42e34255114953fab3dcbeafffc5cd377
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

orderer/localconfig/config.go

@@ -77,6 +77,7 @@ type General struct {
 	GenesisFile    string
 	Profile        Profile
 	LogLevel       string
+	LogFormat      string
 	LocalMSPDir    string
 	LocalMSPID     string
 	BCCSP          *bccsp.FactoryOpts
@@ -173,6 +174,7 @@ var defaults = TopLevel{
 			Address: "0.0.0.0:6060",
 		},
 		LogLevel:    "INFO",
+		LogFormat:   "%{color}%{time:2006-01-02 15:04:05.000 MST} [%{module}] %{shortfunc} -> %{level:.4s} %{id:03x}%{color:reset} %{message}",
 		LocalMSPDir: "msp",
 		LocalMSPID:  "DEFAULT",
 		BCCSP:       bccsp.GetDefaultOpts(),
@@ -269,6 +271,9 @@ func (c *TopLevel) completeInitialization(configDir string) {
 		case c.General.LogLevel == "":
 			logger.Infof("General.LogLevel unset, setting to %s", defaults.General.LogLevel)
 			c.General.LogLevel = defaults.General.LogLevel
+		case c.General.LogFormat == "":
+			logger.Infof("General.LogFormat unset, setting to %s", defaults.General.LogFormat)
+			c.General.LogFormat = defaults.General.LogFormat
 
 		case c.General.GenesisMethod == "":
 			c.General.GenesisMethod = defaults.General.GenesisMethod

orderer/main.go

@@ -86,6 +86,7 @@ func main() {
 
 // Set the logging level
 func initializeLoggingLevel(conf *config.TopLevel) {
+	flogging.InitBackend(flogging.SetFormat(conf.General.LogFormat), os.Stderr)
 	flogging.InitFromSpec(conf.General.LogLevel)
 	if conf.Kafka.Verbose {
 		sarama.Logger = log.New(os.Stdout, "[sarama] ", log.Ldate|log.Lmicroseconds|log.Lshortfile)

sampleconfig/orderer.yaml

@@ -41,6 +41,9 @@ General:
     # per: fabric/docs/Setup/logging-control.md
     LogLevel: info
 
+    # Log Format:  The format string to use when logging.  Especially useful to disable color logging
+    LogFormat: '%{color}%{time:2006-01-02 15:04:05.000 MST} [%{module}] %{shortfunc} -> %{level:.4s} %{id:03x}%{color:reset} %{message}'
+
     # Genesis method: The method by which the genesis block for the orderer
     # system channel is specified. Available options are "provisional", "file":
     #  - provisional: Utilizes a genesis profile, specified by GenesisProfile,