log: fixes for golint warnings (ethereum#16775)

log/README.md

@@ -45,7 +45,7 @@ srvlog.SetHandler(log.MultiHandler(
     log.StreamHandler(os.Stderr, log.LogfmtFormat()),
     log.LvlFilterHandler(
         log.LvlError,
-        log.Must.FileHandler("errors.json", log.JsonFormat()))))
+        log.Must.FileHandler("errors.json", log.JSONFormat()))))
 ```
 
 Will result in output that looks like this:

log/doc.go

@@ -86,7 +86,7 @@ from the rpc package in logfmt to standard out. The other prints records at Erro
 or above in JSON formatted output to the file /var/log/service.json
 
     handler := log.MultiHandler(
-        log.LvlFilterHandler(log.LvlError, log.Must.FileHandler("/var/log/service.json", log.JsonFormat())),
+        log.LvlFilterHandler(log.LvlError, log.Must.FileHandler("/var/log/service.json", log.JSONFormat())),
         log.MatchFilterHandler("pkg", "app/rpc" log.StdoutHandler())
     )
 
@@ -304,8 +304,8 @@ For all Handler functions which can return an error, there is a version of that
 function which will return no error but panics on failure. They are all available
 on the Must object. For example:
 
-    log.Must.FileHandler("/path", log.JsonFormat)
-    log.Must.NetHandler("tcp", ":1234", log.JsonFormat)
+    log.Must.FileHandler("/path", log.JSONFormat)
+    log.Must.NetHandler("tcp", ":1234", log.JSONFormat)
 
 Inspiration and Credit
 

log/format.go

@@ -196,16 +196,16 @@ func logfmt(buf *bytes.Buffer, ctx []interface{}, color int, term bool) {
 	buf.WriteByte('\n')
 }
 
-// JsonFormat formats log records as JSON objects separated by newlines.
-// It is the equivalent of JsonFormatEx(false, true).
-func JsonFormat() Format {
-	return JsonFormatEx(false, true)
+// JSONFormat formats log records as JSON objects separated by newlines.
+// It is the equivalent of JSONFormatEx(false, true).
+func JSONFormat() Format {
+	return JSONFormatEx(false, true)
 }
 
-// JsonFormatEx formats log records as JSON objects. If pretty is true,
+// JSONFormatEx formats log records as JSON objects. If pretty is true,
 // records will be pretty-printed. If lineSeparated is true, records
 // will be logged with a new line between each record.
-func JsonFormatEx(pretty, lineSeparated bool) Format {
+func JSONFormatEx(pretty, lineSeparated bool) Format {
 	jsonMarshal := json.Marshal
 	if pretty {
 		jsonMarshal = func(v interface{}) ([]byte, error) {
@@ -225,7 +225,7 @@ func JsonFormatEx(pretty, lineSeparated bool) Format {
 			if !ok {
 				props[errorKey] = fmt.Sprintf("%+v is not a string key", r.Ctx[i])
 			}
-			props[k] = formatJsonValue(r.Ctx[i+1])
+			props[k] = formatJSONValue(r.Ctx[i+1])
 		}
 
 		b, err := jsonMarshal(props)
@@ -270,7 +270,7 @@ func formatShared(value interface{}) (result interface{}) {
 	}
 }
 
-func formatJsonValue(value interface{}) interface{} {
+func formatJSONValue(value interface{}) interface{} {
 	value = formatShared(value)
 	switch value.(type) {
 	case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string:

log/handler.go

@@ -11,8 +11,8 @@ import (
 	"github.com/go-stack/stack"
 )
 
+// Handler defines where and how log records are written.
 // A Logger prints its log records by writing to a Handler.
-// The Handler interface defines where and how log records are written.
 // Handlers are composable, providing you great flexibility in combining
 // them to achieve the logging structure that suits your applications.
 type Handler interface {
@@ -193,7 +193,7 @@ func LvlFilterHandler(maxLvl Lvl, h Handler) Handler {
 	}, h)
 }
 
-// A MultiHandler dispatches any write to each of its handlers.
+// MultiHandler dispatches any write to each of its handlers.
 // This is useful for writing different types of log information
 // to different locations. For example, to log to a file and
 // standard error:
@@ -212,15 +212,15 @@ func MultiHandler(hs ...Handler) Handler {
 	})
 }
 
-// A FailoverHandler writes all log records to the first handler
+// FailoverHandler writes all log records to the first handler
 // specified, but will failover and write to the second handler if
 // the first handler has failed, and so on for all handlers specified.
 // For example you might want to log to a network socket, but failover
 // to writing to a file if the network fails, and then to
 // standard out if the file write fails:
 //
 //     log.FailoverHandler(
-//         log.Must.NetHandler("tcp", ":9090", log.JsonFormat()),
+//         log.Must.NetHandler("tcp", ":9090", log.JSONFormat()),
 //         log.Must.FileHandler("/var/log/app.log", log.LogfmtFormat()),
 //         log.StdoutHandler)
 //
@@ -336,7 +336,7 @@ func DiscardHandler() Handler {
 	})
 }
 
-// The Must object provides the following Handler creation functions
+// Must provides the following Handler creation functions
 // which instead of returning an error parameter only return a Handler
 // and panic on failure: FileHandler, NetHandler, SyslogHandler, SyslogNetHandler
 var Must muster

log/logger.go

@@ -24,7 +24,7 @@ const (
 	LvlTrace
 )
 
-// Aligned returns a 5-character string containing the name of a Lvl.
+// AlignedString returns a 5-character string containing the name of a Lvl.
 func (l Lvl) AlignedString() string {
 	switch l {
 	case LvlTrace:
@@ -64,7 +64,7 @@ func (l Lvl) String() string {
 	}
 }
 
-// Returns the appropriate Lvl from a string name.
+// LvlFromString returns the appropriate Lvl from a string name.
 // Useful for parsing command line args and configuration files.
 func LvlFromString(lvlString string) (Lvl, error) {
 	switch lvlString {
@@ -95,6 +95,7 @@ type Record struct {
 	KeyNames RecordKeyNames
 }
 
+// RecordKeyNames gets stored in a Record when the write function is executed.
 type RecordKeyNames struct {
 	Time string
 	Msg  string