[FAB-5550] configtxgen use protolator JSON parsing

For v1, configtxgen used some hacks into the configtx core code to get a
JSON representation of the config.  This CR switches the JSON encoding
to use the same protolator helpers as the configtxlator code.

The existing method was (as already noted) hacky, and not as expressive
as the configtxlator method (which also expands other opaque fields like
MSP principals and MSP definitions.  Plus, it is unnecessary code to
maintain.

Change-Id: Ibfe79de834bae6d91e7d67a9f528564658650902
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

Author: Jason Yellick

common/configtx/config.go

@@ -1,157 +1,28 @@
 /*
-Copyright IBM Corp. 2016-2017 All Rights Reserved.
+Copyright IBM Corp. 2017 All Rights Reserved.
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-                 http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
+SPDX-License-Identifier: Apache-2.0
 */
 
 package configtx
 
 import (
-	"bytes"
 	"fmt"
 
 	"github.com/hyperledger/fabric/common/config"
 	"github.com/hyperledger/fabric/common/configtx/api"
 	"github.com/hyperledger/fabric/common/policies"
 	cb "github.com/hyperledger/fabric/protos/common"
-
-	"github.com/golang/protobuf/jsonpb"
-	"github.com/golang/protobuf/proto"
 )
 
-type ConfigResult interface {
-	JSON() string
-}
-
-func NewConfigResult(config *cb.ConfigGroup, proposer api.Proposer) (ConfigResult, error) {
-	return processConfig(config, proposer)
-}
-
 type configResult struct {
-	tx                   interface{}
-	groupName            string
-	groupKey             string
-	group                *cb.ConfigGroup
-	valueHandler         config.ValueProposer
-	policyHandler        policies.Proposer
-	subResults           []*configResult
-	deserializedValues   map[string]proto.Message
-	deserializedPolicies map[string]proto.Message
-}
-
-func (cr *configResult) JSON() string {
-	var buffer bytes.Buffer
-	buffer.WriteString("{")
-	cr.subResults[0].bufferJSON(&buffer)
-	buffer.WriteString("}")
-	return buffer.String()
-
-}
-
-// bufferJSON takes a buffer and writes a JSON representation of the configResult into the buffer
-// Note that we use some mildly ad-hoc JSON encoding because the proto documentation explicitly
-// mentions that the encoding/json package does not correctly marshal proto objects, and we
-// do not have a proto object (nor can one be defined) which presents the mixed-map style of
-// keys mapping to different types of the config
-func (cr *configResult) bufferJSON(buffer *bytes.Buffer) {
-	jpb := &jsonpb.Marshaler{
-		EmitDefaults: true,
-		Indent:       "    ",
-	}
-
-	// "GroupName": {
-	buffer.WriteString("\"")
-	buffer.WriteString(cr.groupKey)
-	buffer.WriteString("\": {")
-
-	//    "Values": {
-	buffer.WriteString("\"Values\": {")
-	count := 0
-	for key, value := range cr.group.Values {
-		// "Key": {
-		buffer.WriteString("\"")
-		buffer.WriteString(key)
-		buffer.WriteString("\": {")
-		// 	"Version": "X",
-		buffer.WriteString("\"Version\":\"")
-		buffer.WriteString(fmt.Sprintf("%d", value.Version))
-		buffer.WriteString("\",")
-		//      "ModPolicy": "foo",
-		buffer.WriteString("\"ModPolicy\":\"")
-		buffer.WriteString(value.ModPolicy)
-		buffer.WriteString("\",")
-		//      "Value": protoAsJSON
-		buffer.WriteString("\"Value\":")
-		jpb.Marshal(buffer, cr.deserializedValues[key])
-		// },
-		buffer.WriteString("}")
-		count++
-		if count < len(cr.group.Values) {
-			buffer.WriteString(",")
-		}
-	}
-	//     },
-	buffer.WriteString("},")
-
-	count = 0
-	//    "Policies": {
-	buffer.WriteString("\"Policies\": {")
-	for key, policy := range cr.group.Policies {
-		// "Key": {
-		buffer.WriteString("\"")
-		buffer.WriteString(key)
-		buffer.WriteString("\": {")
-		// 	"Version": "X",
-		buffer.WriteString("\"Version\":\"")
-		buffer.WriteString(fmt.Sprintf("%d", policy.Version))
-		buffer.WriteString("\",")
-		//      "ModPolicy": "foo",
-		buffer.WriteString("\"ModPolicy\":\"")
-		buffer.WriteString(policy.ModPolicy)
-		buffer.WriteString("\",")
-		//      "Policy": {
-		buffer.WriteString("\"Policy\":{")
-		//          "PolicyType" :
-		buffer.WriteString(fmt.Sprintf("\"PolicyType\":\"%d\",", policy.Policy.Type))
-		//          "Policy" : policyAsJSON
-		buffer.WriteString("\"Policy\":")
-		jpb.Marshal(buffer, cr.deserializedPolicies[key])
-		//      }
-		// },
-		buffer.WriteString("}}")
-		count++
-		if count < len(cr.group.Policies) {
-			buffer.WriteString(",")
-		}
-	}
-	//     },
-	buffer.WriteString("},")
-
-	//     "Groups": {
-	count = 0
-	buffer.WriteString("\"Groups\": {")
-	for _, subResult := range cr.subResults {
-		subResult.bufferJSON(buffer)
-		count++
-		if count < len(cr.subResults) {
-			buffer.WriteString(",")
-		}
-	}
-	//     }
-	buffer.WriteString("}")
-
-	//     }
-	buffer.WriteString("}")
+	tx            interface{}
+	groupName     string
+	groupKey      string
+	group         *cb.ConfigGroup
+	valueHandler  config.ValueProposer
+	policyHandler policies.Proposer
+	subResults    []*configResult
 }
 
 func (cr *configResult) preCommit() error {
@@ -208,35 +79,31 @@ func proposeGroup(result *configResult) error {
 	}
 
 	for key, value := range result.group.Values {
-		msg, err := valueDeserializer.Deserialize(key, value.Value)
+		_, err := valueDeserializer.Deserialize(key, value.Value)
 		if err != nil {
 			result.rollback()
 			return fmt.Errorf("Error deserializing key %s for group %s: %s", key, result.groupName, err)
 		}
-		result.deserializedValues[key] = msg
 	}
 
 	for key, policy := range result.group.Policies {
-		policy, err := result.policyHandler.ProposePolicy(result.tx, key, policy)
+		_, err := result.policyHandler.ProposePolicy(result.tx, key, policy)
 		if err != nil {
 			result.rollback()
 			return err
 		}
-		result.deserializedPolicies[key] = policy
 	}
 
 	result.subResults = make([]*configResult, 0, len(subGroups))
 
 	for i, subGroup := range subGroups {
 		result.subResults = append(result.subResults, &configResult{
-			tx:                   result.tx,
-			groupKey:             subGroup,
-			groupName:            result.groupName + "/" + subGroup,
-			group:                result.group.Groups[subGroup],
-			valueHandler:         subValueHandlers[i],
-			policyHandler:        subPolicyHandlers[i],
-			deserializedValues:   make(map[string]proto.Message),
-			deserializedPolicies: make(map[string]proto.Message),
+			tx:            result.tx,
+			groupKey:      subGroup,
+			groupName:     result.groupName + "/" + subGroup,
+			group:         result.group.Groups[subGroup],
+			valueHandler:  subValueHandlers[i],
+			policyHandler: subPolicyHandlers[i],
 		})
 
 		if err := proposeGroup(result.subResults[i]); err != nil {