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support.go
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support.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package config
import (
"fmt"
"net"
"strconv"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/channelconfig"
"github.com/hyperledger/fabric/common/flogging"
mspconstants "github.com/hyperledger/fabric/msp"
"github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protos/discovery"
"github.com/hyperledger/fabric/protos/msp"
"github.com/pkg/errors"
)
var logger = flogging.MustGetLogger("discovery.config")
// CurrentConfigBlockGetter enables to fetch the last config block
type CurrentConfigBlockGetter interface {
// GetCurrConfigBlock returns the current config block for the given channel
GetCurrConfigBlock(channel string) *common.Block
}
// CurrentConfigBlockGetterFunc enables to fetch the last config block
type CurrentConfigBlockGetterFunc func(channel string) *common.Block
// CurrentConfigBlockGetterFunc enables to fetch the last config block
func (f CurrentConfigBlockGetterFunc) GetCurrConfigBlock(channel string) *common.Block {
return f(channel)
}
// DiscoverySupport implements support that is used for service discovery
// that is related to configuration
type DiscoverySupport struct {
CurrentConfigBlockGetter
}
// NewDiscoverySupport creates a new DiscoverySupport
func NewDiscoverySupport(getLastConfigBlock CurrentConfigBlockGetter) *DiscoverySupport {
return &DiscoverySupport{
CurrentConfigBlockGetter: getLastConfigBlock,
}
}
// Config returns the channel's configuration
func (s *DiscoverySupport) Config(channel string) (*discovery.ConfigResult, error) {
block := s.GetCurrConfigBlock(channel)
if block == nil {
return nil, errors.Errorf("could not get last config block for channel %s", channel)
}
if block.Data == nil || len(block.Data.Data) == 0 {
return nil, errors.Errorf("no transactions in block")
}
env := &common.Envelope{}
if err := proto.Unmarshal(block.Data.Data[0], env); err != nil {
return nil, errors.Wrap(err, "failed unmarshaling envelope")
}
pl := &common.Payload{}
if err := proto.Unmarshal(env.Payload, pl); err != nil {
return nil, errors.Wrap(err, "failed unmarshaling payload")
}
ce := &common.ConfigEnvelope{}
if err := proto.Unmarshal(pl.Data, ce); err != nil {
return nil, errors.Wrap(err, "failed unmarshaling config envelope")
}
if err := ValidateConfigEnvelope(ce); err != nil {
return nil, errors.Wrap(err, "config envelope is invalid")
}
res := &discovery.ConfigResult{
Msps: make(map[string]*msp.FabricMSPConfig),
Orderers: make(map[string]*discovery.Endpoints),
}
ordererGrp := ce.Config.ChannelGroup.Groups[channelconfig.OrdererGroupKey].Groups
appGrp := ce.Config.ChannelGroup.Groups[channelconfig.ApplicationGroupKey].Groups
ordererAddresses := &common.OrdererAddresses{}
if err := proto.Unmarshal(ce.Config.ChannelGroup.Values[channelconfig.OrdererAddressesKey].Value, ordererAddresses); err != nil {
return nil, errors.Wrap(err, "failed unmarshaling orderer addresses")
}
ordererEndpoints, err := computeOrdererEndpoints(ordererGrp, ordererAddresses)
if err != nil {
return nil, errors.Wrap(err, "failed computing orderer addresses")
}
res.Orderers = ordererEndpoints
if err := appendMSPConfigs(ordererGrp, appGrp, res.Msps); err != nil {
return nil, errors.WithStack(err)
}
return res, nil
}
func computeOrdererEndpoints(ordererGrp map[string]*common.ConfigGroup, ordererAddresses *common.OrdererAddresses) (map[string]*discovery.Endpoints, error) {
res := make(map[string]*discovery.Endpoints)
for name, group := range ordererGrp {
mspConfig := &msp.MSPConfig{}
if err := proto.Unmarshal(group.Values[channelconfig.MSPKey].Value, mspConfig); err != nil {
return nil, errors.Wrap(err, "failed parsing MSPConfig")
}
// Skip non fabric MSPs, as they don't carry useful information for service discovery.
// An idemix MSP shouldn't appear inside an orderer group, but this isn't a fatal error
// for the discovery service and we can just ignore it.
if mspConfig.Type != int32(mspconstants.FABRIC) {
logger.Error("Orderer group", name, "is not a FABRIC MSP, but is of type", mspConfig.Type)
continue
}
fabricConfig := &msp.FabricMSPConfig{}
if err := proto.Unmarshal(mspConfig.Config, fabricConfig); err != nil {
return nil, errors.Wrap(err, "failed marshaling FabricMSPConfig")
}
res[fabricConfig.Name] = &discovery.Endpoints{}
for _, endpoint := range ordererAddresses.Addresses {
host, portStr, err := net.SplitHostPort(endpoint)
if err != nil {
return nil, errors.Errorf("failed parsing orderer endpoint %s", endpoint)
}
port, err := strconv.ParseInt(portStr, 10, 32)
if err != nil {
return nil, errors.Errorf("%s is not a valid port number", portStr)
}
res[fabricConfig.Name].Endpoint = append(res[fabricConfig.Name].Endpoint, &discovery.Endpoint{
Host: host,
Port: uint32(port),
})
}
}
return res, nil
}
func appendMSPConfigs(ordererGrp, appGrp map[string]*common.ConfigGroup, output map[string]*msp.FabricMSPConfig) error {
for _, group := range []map[string]*common.ConfigGroup{ordererGrp, appGrp} {
for _, grp := range group {
mspConfig := &msp.MSPConfig{}
if err := proto.Unmarshal(grp.Values[channelconfig.MSPKey].Value, mspConfig); err != nil {
return errors.Wrap(err, "failed parsing MSPConfig")
}
// Skip non fabric MSPs, as they don't carry useful information for service discovery
if mspConfig.Type != int32(mspconstants.FABRIC) {
continue
}
fabricConfig := &msp.FabricMSPConfig{}
if err := proto.Unmarshal(mspConfig.Config, fabricConfig); err != nil {
return errors.Wrap(err, "failed marshaling FabricMSPConfig")
}
if _, exists := output[fabricConfig.Name]; exists {
continue
}
output[fabricConfig.Name] = fabricConfig
}
}
return nil
}
func ValidateConfigEnvelope(ce *common.ConfigEnvelope) error {
if ce.Config == nil {
return fmt.Errorf("field Config is nil")
}
if ce.Config.ChannelGroup == nil {
return fmt.Errorf("field Config.ChannelGroup is nil")
}
grps := ce.Config.ChannelGroup.Groups
if grps == nil {
return fmt.Errorf("field Config.ChannelGroup.Groups is nil")
}
for _, field := range []string{channelconfig.OrdererGroupKey, channelconfig.ApplicationGroupKey} {
grp, exists := grps[field]
if !exists {
return fmt.Errorf("key Config.ChannelGroup.Groups[%s] is missing", field)
}
if grp.Groups == nil {
return fmt.Errorf("key Config.ChannelGroup.Groups[%s].Groups is nil", field)
}
}
if ce.Config.ChannelGroup.Values == nil {
return fmt.Errorf("field Config.ChannelGroup.Values is nil")
}
if _, exists := ce.Config.ChannelGroup.Values[channelconfig.OrdererAddressesKey]; !exists {
return fmt.Errorf("field Config.ChannelGroup.Values is empty")
}
return nil
}