Merge pull request #11 from emahiro/fix/goreportcard_feedback

Fix/goreportcard feedback

README.md

@@ -1,4 +1,5 @@
 [![Build Status](https://travis-ci.org/emahiro/ae-plain-logger.svg?branch=master)](https://travis-ci.org/emahiro/ae-plain-logger)
+[![Go Report Card](https://goreportcard.com/badge/github.com/emahiro/ae-plain-logger)](https://goreportcard.com/report/github.com/emahiro/ae-plain-logger)
 
 
 # App Engine Plain Logger

log/log.go

@@ -9,39 +9,31 @@ import (
 	"github.com/emahiro/ae-plain-logger/spancontext"
 )
 
-const (
-	LevelDebug    = "DEBUG"
-	LevelInfo     = "INFO"
-	LevelWarning  = "WARNING"
-	LevelError    = "ERROR"
-	LevelCritical = "CRITICAL"
-)
-
 var projectID = os.Getenv("GOOGLE_CLOUD_PROJECT")
 
 // Debugf is output of debug level log
 func Debugf(ctx context.Context, format string, a ...interface{}) {
-	out(ctx, LevelDebug, format, a)
+	out(ctx, "DEBUG", format, a)
 }
 
-// Infof is output of infomation level log
+// Infof is output of information level log
 func Infof(ctx context.Context, format string, a ...interface{}) {
-	out(ctx, LevelInfo, format, a)
+	out(ctx, "INFO", format, a)
 }
 
 // Warningf is output of warning level log
 func Warningf(ctx context.Context, format string, a ...interface{}) {
-	out(ctx, LevelWarning, format, a)
+	out(ctx, "WARNING", format, a)
 }
 
 // Errorf is output of error level log
 func Errorf(ctx context.Context, format string, a ...interface{}) {
-	out(ctx, LevelError, format, a)
+	out(ctx, "ERROR", format, a)
 }
 
 // Criticalf is output of critical level log
 func Criticalf(ctx context.Context, format string, a ...interface{}) {
-	out(ctx, LevelCritical, format, a)
+	out(ctx, "CRITICAL", format, a)
 }
 
 type jsonPayload struct {

spancontext/spancontext.go

@@ -8,11 +8,13 @@ import (
 	"go.opencensus.io/trace"
 )
 
+// AEPlainLogSpanContext is SpanContext struct of AppEnginePlainLogger
 type AEPlainLogSpanContext struct {
 	SpanID  string
 	TraceID string
 }
 
+// Get is method of get AEPlainLogSpanContext
 func Get(ctx context.Context) AEPlainLogSpanContext {
 	sc := trace.FromContext(ctx).SpanContext()
 	return AEPlainLogSpanContext{
@@ -21,6 +23,7 @@ func Get(ctx context.Context) AEPlainLogSpanContext {
 	}
 }
 
+// Set is method of set SpanContext in request
 func Set(r *http.Request, label string) (context.Context, func()) {
 	ctx := r.Context()
 	span := new(trace.Span)