[FAB-2702] (PA) Specify consortium in chan config

In order to associate channels to the consortium they were created in
the context of, it's necessary to add a proto definition which defines
the consortium name a channel was created for.

This CR defines the protos and updates the config structures to
appropriately parse the consortium name.

Change-Id: Ie10c3273c1801201ff99f7eed417dddfac778315
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>
Signed-off-by: Kostas Christidis <kostas@christidis.io>

common/config/channel.go

@@ -28,6 +28,9 @@ import (
 
 // Channel config keys
 const (
+	// ConsortiumKey is the key for the cb.ConfigValue for the Consortium message
+	ConsortiumKey = "Consortium"
+
 	// HashingAlgorithmKey is the cb.ConfigItem type key name for the HashingAlgorithm message
 	HashingAlgorithmKey = "HashingAlgorithm"
 
@@ -60,6 +63,7 @@ type ChannelProtos struct {
 	HashingAlgorithm          *cb.HashingAlgorithm
 	BlockDataHashingStructure *cb.BlockDataHashingStructure
 	OrdererAddresses          *cb.OrdererAddresses
+	Consortium                *cb.Consortium
 }
 
 type channelConfigSetter struct {
@@ -165,6 +169,11 @@ func (cc *ChannelConfig) OrdererAddresses() []string {
 	return cc.protos.OrdererAddresses.Addresses
 }
 
+// ConsortiumName returns the name of the consortium this channel was created under
+func (cc *ChannelConfig) ConsortiumName() string {
+	return cc.protos.Consortium.Name
+}
+
 // Validate inspects the generated configuration protos, ensures that the values are correct, and
 // sets the ChannelConfig fields that may be referenced after Commit
 func (cc *ChannelConfig) Validate(tx interface{}, groups map[string]ValueProposer) error {

common/config/channel_util.go

@@ -34,10 +34,14 @@ func configGroup(key string, value []byte) *cb.ConfigGroup {
 	return result
 }
 
+// TemplateConsortiumName creates a ConfigGroup representing the ConsortiumName
+func TemplateConsortium(name string) *cb.ConfigGroup {
+	return configGroup(ConsortiumKey, utils.MarshalOrPanic(&cb.Consortium{Name: name}))
+}
+
 // TemplateHashingAlgorithm creates a ConfigGroup representing the HashingAlgorithm
 func TemplateHashingAlgorithm(name string) *cb.ConfigGroup {
 	return configGroup(HashingAlgorithmKey, utils.MarshalOrPanic(&cb.HashingAlgorithm{Name: name}))
-
 }
 
 // DefaultHashingAlgorithm creates a headerless config item for the default hashing algorithm

protos/common/configuration.proto

@@ -41,3 +41,8 @@ message BlockDataHashingStructure {
 message OrdererAddresses {
     repeated string addresses = 1;
 }
+
+// Consortium represents the consortium context in which the channel was created
+message Consortium {
+    string name = 1;
+}