[FAB-9238] Removed unmarshal lookup options

- sdk will take care of unmarshalling backend
lookup value to desired types
- removed loggers from config loading functions
to avoid default logger initialization


Change-Id: Ibb1ba426ebf74743fdb0787f066df1217ba965b6
Signed-off-by: Sudesh Shetty <sudesh.shetty@securekey.com>

pkg/common/providers/core/provider.go

@@ -29,23 +29,7 @@ type Providers interface {
 //ConfigProvider provides config backend for SDK
 type ConfigProvider func() (ConfigBackend, error)
 
-//LookupOpts contains options for looking up key in config backend
-type LookupOpts struct {
-	UnmarshalType interface{}
-}
-
-//LookupOption option to lookup key in config backend
-type LookupOption func(opts *LookupOpts)
-
 //ConfigBackend backend for all config types in SDK
 type ConfigBackend interface {
-	//TODO lookupOption should be removed, unmarshal option should be handled externally
-	Lookup(key string, opts ...LookupOption) (interface{}, bool)
-}
-
-//WithUnmarshalType lookup option which can be used to unmarshal lookup value to provided type
-func WithUnmarshalType(unmarshalType interface{}) LookupOption {
-	return func(opts *LookupOpts) {
-		opts.UnmarshalType = unmarshalType
-	}
+	Lookup(key string) (interface{}, bool)
 }

pkg/core/config/config.go

@@ -19,8 +19,6 @@ import (
 	"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
 )
 
-var logger = logging.NewLogger("fabsdk/core")
-
 var logModules = [...]string{"fabsdk", "fabsdk/client", "fabsdk/core", "fabsdk/fab", "fabsdk/common",
 	"fabsdk/msp", "fabsdk/util", "fabsdk/context"}
 
@@ -61,9 +59,7 @@ func FromFile(name string, opts ...Option) core.ConfigProvider {
 
 		// If a config file is found, read it in.
 		err = backend.configViper.MergeInConfig()
-		if err == nil {
-			logger.Debugf("Using config file: %s", backend.configViper.ConfigFileUsed())
-		} else {
+		if err != nil {
 			return nil, errors.Wrap(err, "loading config file failed")
 		}
 
@@ -77,7 +73,6 @@ func FromFile(name string, opts ...Option) core.ConfigProvider {
 func FromRaw(configBytes []byte, configType string, opts ...Option) core.ConfigProvider {
 	return func() (core.ConfigBackend, error) {
 		buf := bytes.NewBuffer(configBytes)
-		logger.Debugf("config.FromRaw buf Len is %d, Cap is %d: %s", buf.Len(), buf.Cap(), buf)
 		return initFromReader(buf, configType, opts...)
 	}
 }
@@ -154,7 +149,6 @@ func setLogLevel(backend core.ConfigBackend) {
 	logLevel := logging.INFO
 	if loggingLevelString != nil {
 		const logModule = "fabsdk" // TODO: allow more flexability in setting levels for different modules
-		logger.Debugf("%s logging level from the config: %v", logModule, loggingLevelString)
 		var err error
 		logLevel, err = logging.LogLevel(loggingLevelString.(string))
 		if err != nil {

pkg/core/config/defbackend.go

@@ -7,7 +7,6 @@ SPDX-License-Identifier: Apache-2.0
 package config
 
 import (
-	"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
 	"github.com/hyperledger/fabric-sdk-go/pkg/util/pathvar"
 	"github.com/pkg/errors"
 	"github.com/spf13/viper"
@@ -20,22 +19,7 @@ type defConfigBackend struct {
 }
 
 // Lookup gets the config item value by Key
-func (c *defConfigBackend) Lookup(key string, opts ...core.LookupOption) (interface{}, bool) {
-	if len(opts) > 0 {
-		lookupOpts := &core.LookupOpts{}
-		for _, option := range opts {
-			option(lookupOpts)
-		}
-
-		if lookupOpts.UnmarshalType != nil {
-			err := c.configViper.UnmarshalKey(key, lookupOpts.UnmarshalType)
-			if err != nil {
-				//TODO may need debug logger here
-				return nil, false
-			}
-			return lookupOpts.UnmarshalType, true
-		}
-	}
+func (c *defConfigBackend) Lookup(key string) (interface{}, bool) {
 	value := c.configViper.Get(key)
 	if value == nil {
 		return nil, false

pkg/core/config/lookup/lookup.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
+	"github.com/mitchellh/mapstructure"
 	"github.com/spf13/cast"
 )
 
@@ -60,7 +61,19 @@ func (c *ConfigLookup) GetDuration(key string) time.Duration {
 }
 
 //UnmarshalKey unmarshals value for given key to rawval type
-func (c *ConfigLookup) UnmarshalKey(key string, rawVal interface{}) bool {
-	_, ok := c.backend.Lookup(key, core.WithUnmarshalType(rawVal))
-	return ok
+func (c *ConfigLookup) UnmarshalKey(key string, rawVal interface{}) error {
+	value, ok := c.backend.Lookup(key)
+	if !ok {
+		return nil
+	}
+
+	decoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
+		DecodeHook: mapstructure.StringToTimeDurationHookFunc(),
+		Result:     rawVal,
+	})
+	if err != nil {
+		return err
+	}
+
+	return decoder.Decode(value)
 }