[FAB-2937] Fix minor issues in localconfig

1. Remove unnecessary struct
2. Bring it inline with const/init declarations I did in
`common/configtx/tool/localconfig`

(By the way, the periods in the exported comments is not OCD but
actually a guideline:
https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences)

Change-Id: If2d4394ffafaf1ae3e15fa228b4e40abc0dea47b
Signed-off-by: Kostas Christidis <[email protected]>

Author: kchristidis

common/configtx/tool/localconfig/config.go

@@ -171,7 +171,7 @@ func (p *Profile) completeInitialization() {
 func Load(profile string) *Profile {
 	config := viper.New()
 
-	config.SetConfigName("configtx")
+	config.SetConfigName(configName)
 	var cfgPath string
 
 	// Candidate paths to look for the config file in, based on GOPATH

orderer/localconfig/config.go

@@ -17,12 +17,12 @@ limitations under the License.
 package config
 
 import (
-	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
 
+	"github.com/hyperledger/fabric/common/flogging"
 	"github.com/hyperledger/fabric/common/viperutil"
 
 	"github.com/Shopify/sarama"
@@ -32,16 +32,29 @@ import (
 	bccsp "github.com/hyperledger/fabric/bccsp/factory"
 )
 
-var logger = logging.MustGetLogger("orderer/config")
+const (
+	pkgLogID = "orderer/config"
+
+	// Prefix identifies the prefix for the orderer-related ENV vars.
+	Prefix = "ORDERER"
+)
+
+var (
+	logger *logging.Logger
+
+	configName     string
+	configFileName string
+)
 
 func init() {
-	logging.SetLevel(logging.ERROR, "")
-}
+	logger = flogging.MustGetLogger(pkgLogID)
+	flogging.SetModuleLevel(pkgLogID, "error")
 
-// Prefix is the default config prefix for the orderer
-const Prefix string = "ORDERER"
+	configName = strings.ToLower(Prefix)
+	configFileName = configName + ".yaml"
+}
 
-// General contains config which should be common among all orderer types
+// General contains config which should be common among all orderer types.
 type General struct {
 	LedgerType     string
 	ListenAddress  string
@@ -57,7 +70,7 @@ type General struct {
 	BCCSP          *bccsp.FactoryOpts
 }
 
-//TLS contains config used to configure TLS
+// TLS contains config for TLS connections.
 type TLS struct {
 	Enabled           bool
 	PrivateKey        string
@@ -68,68 +81,63 @@ type TLS struct {
 }
 
 // Genesis is a deprecated structure which was used to put
-// values into the genesis block, but this is now handled elsewhere
+// values into the genesis block, but this is now handled elsewhere.
 // SBFT did not reference these values via the genesis block however
-// so it is being left here for backwards compatibility purposes
+// so it is being left here for backwards compatibility purposes.
 type Genesis struct {
 	DeprecatedBatchTimeout time.Duration
 	DeprecatedBatchSize    uint32
 	SbftShared             SbftShared
 }
 
-// Profile contains configuration for Go pprof profiling
+// Profile contains configuration for Go pprof profiling.
 type Profile struct {
 	Enabled bool
 	Address string
 }
 
-// RAMLedger contains config for the RAM ledger
+// RAMLedger contains configuration for the RAM ledger.
 type RAMLedger struct {
 	HistorySize uint
 }
 
-// FileLedger contains config for the File ledger
+// FileLedger contains configuration for the file-based ledger.
 type FileLedger struct {
 	Location string
 	Prefix   string
 }
 
-// Kafka contains config for the Kafka orderer
+// Kafka contains configuration for the Kafka-based orderer.
 type Kafka struct {
 	Retry   Retry
 	Verbose bool
-	Version sarama.KafkaVersion
+	Version sarama.KafkaVersion // TODO Move this to global config
 	TLS     TLS
 }
 
-// SbftLocal contains config for the SBFT peer/replica
+// SbftLocal contains configuration for the SBFT peer/replica.
 type SbftLocal struct {
 	PeerCommAddr string
 	CertFile     string
 	KeyFile      string
 	DataDir      string
 }
 
-// SbftShared contains config for the SBFT network
+// SbftShared contains config for the SBFT network.
 type SbftShared struct {
 	N                  uint64
 	F                  uint64
 	RequestTimeoutNsec uint64
 	Peers              map[string]string // Address to Cert mapping
 }
 
-// Retry contains config for the reconnection attempts to the Kafka brokers
+// Retry contains config for the reconnection attempts to the Kafka brokers.
 type Retry struct {
 	Period time.Duration
 	Stop   time.Duration
 }
 
-type RuntimeAndGenesis struct {
-	runtime *TopLevel
-	genesis *Genesis
-}
-
-// TopLevel directly corresponds to the orderer config yaml
+// TopLevel directly corresponds to the orderer config YAML.
 // Note, for non 1-1 mappings, you may append
 // something like `mapstructure:"weirdFoRMat"` to
 // modify the default mapping, see the "Unmarshal"
@@ -257,22 +265,23 @@ func (c *TopLevel) completeInitialization() {
 func Load() *TopLevel {
 	config := viper.New()
 
-	config.SetConfigName("orderer")
+	config.SetConfigName(configName)
+
 	cfgPath := os.Getenv("ORDERER_CFG_PATH")
 	if cfgPath == "" {
-		logger.Infof("No orderer cfg path set, assuming development environment, deriving from go path")
+		logger.Infof("No ORDERER_CFG_PATH set, assuming development environment, deriving from Go path.")
 		// Path to look for the config file in based on GOPATH
 		gopath := os.Getenv("GOPATH")
 		for _, p := range filepath.SplitList(gopath) {
 			ordererPath := filepath.Join(p, "src/github.com/hyperledger/fabric/orderer/")
-			if _, err := os.Stat(filepath.Join(ordererPath, "orderer.yaml")); err != nil {
-				// The yaml file does not exist in this component of the go src
+			if _, err := os.Stat(filepath.Join(ordererPath, configFileName)); err != nil {
+				// The YAML file does not exist in this component of the go src
 				continue
 			}
 			cfgPath = ordererPath
 		}
 		if cfgPath == "" {
-			logger.Fatalf("Could not find orderer.yaml, try setting ORDERER_CFG_PATH or GOPATH correctly")
+			logger.Fatalf("Could not find %s, try setting ORDERER_CFG_PATH or GOPATH correctly.", configFileName)
 		}
 		logger.Infof("Setting ORDERER_CFG_PATH to: %s", cfgPath)
 		os.Setenv("ORDERER_CFG_PATH", cfgPath)
@@ -287,16 +296,14 @@ func Load() *TopLevel {
 
 	err := config.ReadInConfig()
 	if err != nil {
-		panic(fmt.Errorf("Error reading %s plugin config: %s", Prefix, err))
+		logger.Panicf("Error reading configuration from %s in %s: %s", configFileName, cfgPath, err)
 	}
 
 	var uconf TopLevel
-
 	err = viperutil.EnhancedExactUnmarshal(config, &uconf)
 	if err != nil {
-		panic(fmt.Errorf("Error unmarshaling into structure: %s", err))
+		logger.Panicf("Error unmarshaling config into struct: %s", err)
 	}
-
 	uconf.completeInitialization()
 
 	return &uconf

protos/common/common.proto

@@ -48,8 +48,8 @@ enum HeaderType {
 // This enum enlists indexes of the block metadata array
 enum BlockMetadataIndex {
     SIGNATURES = 0;             // Block metadata array position for block signatures
-    LAST_CONFIG = 1;            // Block metadata array poistion to store last configuration block sequence number
-    TRANSACTIONS_FILTER = 2;    // Block metadata array poistion to store serialized bit array filter of invalid transactions
+    LAST_CONFIG = 1;            // Block metadata array position to store last configuration block sequence number
+    TRANSACTIONS_FILTER = 2;    // Block metadata array position to store serialized bit array filter of invalid transactions
     ORDERER = 3;                // Block metadata array position to store operational metadata for orderers
                                 // e.g. For Kafka, this is where we store the last offset written to the local ledger.
 }