config: Use log level name DEBUG instead of TRACE

Add log level parsing into openLog() for #90

cmd/inbucket/main.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"os/signal"
 	"runtime"
+	"strings"
 	"syscall"
 	"time"
 
@@ -73,13 +74,6 @@ func main() {
 		config.Usage()
 		return
 	}
-	// Logger setup.
-	closeLog, err := openLog(*logfile, *logjson)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Log error: %v\n", err)
-		os.Exit(1)
-	}
-	startupLog := log.With().Str("phase", "startup").Logger()
 	// Process configuration.
 	config.Version = version
 	config.BuildDate = date
@@ -92,6 +86,13 @@ func main() {
 		conf.POP3.Debug = true
 		conf.SMTP.Debug = true
 	}
+	// Logger setup.
+	closeLog, err := openLog(conf.LogLevel, *logfile, *logjson)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Log error: %v\n", err)
+		os.Exit(1)
+	}
+	startupLog := log.With().Str("phase", "startup").Logger()
 	// Setup signal handler.
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, syscall.SIGTERM, syscall.SIGINT)
@@ -166,9 +167,20 @@ signalLoop:
 }
 
 // openLog configures zerolog output, returns func to close logfile.
-func openLog(logfile string, json bool) (close func(), err error) {
-	close = func() {}
+func openLog(level string, logfile string, json bool) (close func(), err error) {
+	switch strings.ToUpper(level) {
+	case "DEBUG":
 		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	case "INFO":
+		zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	case "WARN":
+		zerolog.SetGlobalLevel(zerolog.WarnLevel)
+	case "ERROR":
+		zerolog.SetGlobalLevel(zerolog.ErrorLevel)
+	default:
+		return nil, fmt.Errorf("Log level %q not one of: DEBUG, INFO, WARN, ERROR", level)
+	}
+	close = func() {}
 	var w io.Writer
 	color := true
 	switch logfile {

doc/config.md

@@ -8,7 +8,7 @@ Running `inbucket -help` will yield a condensed summary of the environment
 variables it supports:
 
     KEY                                 DEFAULT             DESCRIPTION
-    INBUCKET_LOGLEVEL                   INFO                TRACE, INFO, WARN, or ERROR
+    INBUCKET_LOGLEVEL                   INFO                DEBUG, INFO, WARN, or ERROR
     INBUCKET_SMTP_ADDR                  0.0.0.0:2500        SMTP server IP4 host:port
     INBUCKET_SMTP_DOMAIN                inbucket            HELO domain
     INBUCKET_SMTP_DOMAINNOSTORE                             Load testing domain
@@ -47,7 +47,7 @@ should probably select INFO, but a busy shared installation would be better off
 with WARN or ERROR.
 
 - Default: `INFO`
-- Values: one of `TRACE`, `INFO`, `WARN`, or `ERROR`
+- Values: one of `DEBUG`, `INFO`, `WARN`, or `ERROR`
 
 
 ## SMTP

pkg/config/config.go

@@ -29,7 +29,7 @@ var (
 
 // Root wraps all other configurations.
 type Root struct {
-	LogLevel string `required:"true" default:"INFO" desc:"TRACE, INFO, WARN, or ERROR"`
+	LogLevel string `required:"true" default:"INFO" desc:"DEBUG, INFO, WARN, or ERROR"`
 	SMTP     SMTP
 	POP3     POP3
 	Web      Web