[FAB-1362] Add KafkaBrokers to shared config

https://jira.hyperledger.org/browse/FAB-1362

The list of Kafka brokers used for ordering needs to be shared across the
shims (ordering service nodes). This changeset introduces the key and
the getter of that key's value to the sharedconfig package. It also adds
the necessary definition in the orderer protos.

This value is not yet encoded as a configuration item in the genesis
block that the static bootstrapper produces. This will come at a
subsequent changeset, with the introduction of the provisional
bootstrapper.

Change-Id: I6268e79dc25ca2cee8da248ba44c9a572c04d909
Signed-off-by: Kostas Christidis <kostas@christidis.io>

Author: Kostas Christidis

orderer/common/sharedconfig/sharedconfig.go

@@ -18,6 +18,9 @@ package sharedconfig
 
 import (
 	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
 
 	cb "github.com/hyperledger/fabric/protos/common"
 	ab "github.com/hyperledger/fabric/protos/orderer"
@@ -26,14 +29,19 @@ import (
 	"github.com/op/go-logging"
 )
 
-// ConsensusTypeKey is the cb.ConfigurationItem type key name for the ConsensusType message
-const ConsensusTypeKey = "ConsensusType"
+const (
+	// ConsensusTypeKey is the cb.ConfigurationItem type key name for the ConsensusType message
+	ConsensusTypeKey = "ConsensusType"
 
-// BatchSizeKey is the cb.ConfigurationItem type key name for the BatchSize message
-const BatchSizeKey = "BatchSize"
+	// BatchSizeKey is the cb.ConfigurationItem type key name for the BatchSize message
+	BatchSizeKey = "BatchSize"
 
-// ChainCreatorsKey is the cb.ConfigurationItem type key name for the ChainCreators message
-const ChainCreatorsKey = "ChainCreators"
+	// ChainCreatorsKey is the cb.ConfigurationItem type key name for the ChainCreators message
+	ChainCreatorsKey = "ChainCreators"
+
+	// KafkaBrokersKey is the cb.ConfigurationItem type key name for the KafkaBrokers message
+	KafkaBrokersKey = "KafkaBrokers"
+)
 
 var logger = logging.MustGetLogger("orderer/common/sharedconfig")
 
@@ -55,12 +63,18 @@ type Manager interface {
 	// ChainCreators returns the policy names which are allowed for chain creation
 	// This field is only set for the system ordering chain
 	ChainCreators() []string
+
+	// KafkaBrokers returns the addresses (IP:port notation) of a set of "bootstrap"
+	// Kafka brokers, i.e. this is not necessarily the entire set of Kafka brokers
+	// used for ordering
+	KafkaBrokers() []string
 }
 
 type ordererConfig struct {
 	consensusType string
 	batchSize     uint32
 	chainCreators []string
+	kafkaBrokers  []string
 }
 
 // ManagerImpl is an implementation of Manager and configtx.ConfigHandler
@@ -93,6 +107,13 @@ func (pm *ManagerImpl) ChainCreators() []string {
 	return pm.config.chainCreators
 }
 
+// KafkaBrokers returns the addresses (IP:port notation) of a set of "bootstrap"
+// Kafka brokers, i.e. this is not necessarily the entire set of Kafka brokers
+// used for ordering
+func (pm *ManagerImpl) KafkaBrokers() []string {
+	return pm.config.kafkaBrokers
+}
+
 // BeginConfig is used to start a new configuration proposal
 func (pm *ManagerImpl) BeginConfig() {
 	if pm.pendingConfig != nil {
@@ -135,7 +156,6 @@ func (pm *ManagerImpl) ProposeConfig(configItem *cb.ConfigurationItem) error {
 		if consensusType.Type != pm.config.consensusType {
 			return fmt.Errorf("Attempted to change the consensus type from %s to %s after init", pm.config.consensusType, consensusType.Type)
 		}
-
 		pm.pendingConfig.consensusType = consensusType.Type
 	case BatchSizeKey:
 		batchSize := &ab.BatchSize{}
@@ -147,17 +167,60 @@ func (pm *ManagerImpl) ProposeConfig(configItem *cb.ConfigurationItem) error {
 		if batchSize.Messages <= 0 {
 			return fmt.Errorf("Attempted to set the batch size to %d which is less than or equal to  0", batchSize.Messages)
 		}
-
 		pm.pendingConfig.batchSize = batchSize.Messages
 	case ChainCreatorsKey:
 		chainCreators := &ab.ChainCreators{}
 		err := proto.Unmarshal(configItem.Value, chainCreators)
 		if err != nil {
 			return fmt.Errorf("Unmarshaling error for ChainCreator: %s", err)
 		}
-
 		pm.pendingConfig.chainCreators = chainCreators.Policies
+	case KafkaBrokersKey:
+		kafkaBrokers := &ab.KafkaBrokers{}
+		err := proto.Unmarshal(configItem.Value, kafkaBrokers)
+		if err != nil {
+			return fmt.Errorf("Unmarshaling error for KafkaBrokers: %s", err)
+		}
+		if len(kafkaBrokers.Brokers) == 0 {
+			return fmt.Errorf("Kafka broker set cannot be nil")
+		}
+		for _, broker := range kafkaBrokers.Brokers {
+			if !brokerEntrySeemsValid(broker) {
+				return fmt.Errorf("Invalid broker entry: %s", broker)
+			}
+		}
+		pm.pendingConfig.kafkaBrokers = kafkaBrokers.Brokers
 	}
-
 	return nil
 }
+
+// This does just a barebones sanitfy check.
+func brokerEntrySeemsValid(broker string) bool {
+	if !strings.Contains(broker, ":") {
+		return false
+	}
+
+	parts := strings.Split(broker, ":")
+	if len(parts) > 2 {
+		return false
+	}
+
+	host := parts[0]
+	port := parts[1]
+
+	if _, err := strconv.ParseUint(port, 10, 16); err != nil {
+		return false
+	}
+
+	// Valid hostnames may contain only the ASCII letters 'a' through 'z' (in a
+	// case-insensitive manner), the digits '0' through '9', and the hyphen. IP
+	// v4 addresses are  represented in dot-decimal notation, which consists of
+	// four decimal numbers, each ranging from 0 to 255, separated by dots,
+	// e.g., 172.16.254.1
+	// The following regular expression:
+	// 1. allows just a-z (case-insensitive), 0-9, and the dot and hyphen characters
+	// 2. does not allow leading trailing dots or hyphens
+	re, _ := regexp.Compile("^([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9.-]*[a-zA-Z0-9])$")
+	matched := re.FindString(host)
+	return len(matched) == len(host)
+}

orderer/common/sharedconfig/sharedconfig_test.go

@@ -62,7 +62,6 @@ func TestCommitWithoutBegin(t *testing.T) {
 	if !crashes {
 		t.Fatalf("Should have crashed on multiple begin configs")
 	}
-
 }
 
 func TestRollback(t *testing.T) {
@@ -123,17 +122,15 @@ func TestConsensusType(t *testing.T) {
 	if nowType := m.ConsensusType(); nowType != endType {
 		t.Fatalf("Consensus type should have ended as %s but was %s", endType, nowType)
 	}
-
 }
 
 func TestBatchSize(t *testing.T) {
 	endBatchSize := uint32(10)
-	invalidMessage :=
-		&cb.ConfigurationItem{
-			Type:  cb.ConfigurationItem_Orderer,
-			Key:   BatchSizeKey,
-			Value: []byte("Garbage Data"),
-		}
+	invalidMessage := &cb.ConfigurationItem{
+		Type:  cb.ConfigurationItem_Orderer,
+		Key:   BatchSizeKey,
+		Value: []byte("Garbage Data"),
+	}
 	zeroBatchSize := &cb.ConfigurationItem{
 		Type:  cb.ConfigurationItem_Orderer,
 		Key:   BatchSizeKey,
@@ -167,5 +164,72 @@ func TestBatchSize(t *testing.T) {
 	if nowBatchSize := m.BatchSize(); nowBatchSize != endBatchSize {
 		t.Fatalf("Got batch size of %d when expecting batch size of %d", nowBatchSize, endBatchSize)
 	}
+}
+
+func TestKafkaBrokers(t *testing.T) {
+	endList := []string{"127.0.0.1:9092", "foo.bar:9092"}
+
+	invalidMessage := &cb.ConfigurationItem{
+		Type:  cb.ConfigurationItem_Orderer,
+		Key:   KafkaBrokersKey,
+		Value: []byte("Garbage Data"),
+	}
+
+	zeroBrokers := &cb.ConfigurationItem{
+		Type:  cb.ConfigurationItem_Orderer,
+		Key:   KafkaBrokersKey,
+		Value: utils.MarshalOrPanic(&ab.KafkaBrokers{}),
+	}
+
+	badList := []string{"127.0.0.1", "foo.bar", "127.0.0.1:-1", "localhost:65536", "foo.bar.:9092", ".127.0.0.1:9092", "-foo.bar:9092"}
+	badMessages := []*cb.ConfigurationItem{}
+	for _, badAddress := range badList {
+		msg := &cb.ConfigurationItem{
+			Type:  cb.ConfigurationItem_Orderer,
+			Key:   KafkaBrokersKey,
+			Value: utils.MarshalOrPanic(&ab.KafkaBrokers{Brokers: []string{badAddress}}),
+		}
+		badMessages = append(badMessages, msg)
+	}
+
+	validMessage := &cb.ConfigurationItem{
+		Type:  cb.ConfigurationItem_Orderer,
+		Key:   KafkaBrokersKey,
+		Value: utils.MarshalOrPanic(&ab.KafkaBrokers{Brokers: endList}),
+	}
+
+	m := NewManagerImpl()
+	m.BeginConfig()
+
+	err := m.ProposeConfig(validMessage)
+	if err != nil {
+		t.Fatalf("Error applying valid config: %s", err)
+	}
+
+	err = m.ProposeConfig(invalidMessage)
+	if err == nil {
+		t.Fatalf("Should have failed on invalid message")
+	}
+
+	err = m.ProposeConfig(zeroBrokers)
+	if err == nil {
+		t.Fatalf("Should have rejected empty brokers list")
+	}
 
+	for i := range badMessages {
+		err = m.ProposeConfig(badMessages[i])
+		if err == nil {
+			t.Fatalf("Should have rejected broker address which is obviously malformed")
+		}
+	}
+
+	m.CommitConfig()
+
+	nowList := m.KafkaBrokers()
+	switch {
+	case len(nowList) != len(endList), nowList[0] != endList[0]:
+		t.Fatalf("Got brokers list %s when expecting brokers list %s", nowList, endList)
+	default:
+		return
+	}
 }

orderer/mocks/sharedconfig/sharedconfig.go

@@ -24,6 +24,8 @@ type Manager struct {
 	BatchSizeVal uint32
 	// ChainCreatorsVal is returned as the result of ChainCreators()
 	ChainCreatorsVal []string
+	// KafkaBrokersVal is returned as the result of KafkaBrokers()
+	KafkaBrokersVal []string
 }
 
 // ConsensusType returns the ConsensusTypeVal
@@ -40,3 +42,8 @@ func (scm *Manager) BatchSize() uint32 {
 func (scm *Manager) ChainCreators() []string {
 	return scm.ChainCreatorsVal
 }
+
+// KafkaBrokers returns the KafkaBrokersVal
+func (scm *Manager) KafkaBrokers() []string {
+	return scm.KafkaBrokersVal
+}

orderer/multichain/systemchain_test.go

@@ -62,6 +62,10 @@ func (msc *mockSharedConfig) ChainCreators() []string {
 	return msc.chainCreators
 }
 
+func (msc *mockSharedConfig) KafkaBrokers() []string {
+	panic("Unimplemented")
+}
+
 type mockSupport struct {
 	mpm     *mockPolicyManager
 	msc     *mockSharedConfig

protos/common/common.proto

@@ -35,11 +35,11 @@ enum Status {
 }
 
 enum HeaderType {
-        MESSAGE = 0;                   // Used for messages which are signed but opaque
-        CONFIGURATION_TRANSACTION = 1; // Used for messages which reconfigure the chain
-        CONFIGURATION_ITEM = 2;        // Used inside of the the reconfiguration message for signing over ConfigurationItems
-        ENDORSER_TRANSACTION = 3;      // Used by the SDK to submit endorser based transactions
-        ORDERER_TRANSACTION = 4;       // Used internally by the orderer for management
+    MESSAGE = 0;                   // Used for messages which are signed but opaque
+    CONFIGURATION_TRANSACTION = 1; // Used for messages which reconfigure the chain
+    CONFIGURATION_ITEM = 2;        // Used inside of the the reconfiguration message for signing over ConfigurationItems
+    ENDORSER_TRANSACTION = 3;      // Used by the SDK to submit endorser based transactions
+    ORDERER_TRANSACTION = 4;       // Used internally by the orderer for management
 }
 
 // This enum enlist indexes of the block metadata array