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lifecycle.go
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lifecycle.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package cclifecycle
import (
"sync"
"github.com/mcc-github/blockchain/common/chaincode"
"github.com/mcc-github/blockchain/common/flogging"
"github.com/pkg/errors"
)
var (
Logger = flogging.MustGetLogger("discovery.lifecycle")
)
type MetadataManager struct {
sync.RWMutex
listeners []MetadataChangeListener
installedCCs []chaincode.InstalledChaincode
deployedCCsByChannel map[string]*chaincode.MetadataMapping
queryCreatorsByChannel map[string]QueryCreator
}
type MetadataChangeListener interface {
HandleMetadataUpdate(channel string, chaincodes chaincode.MetadataSet)
}
type HandleMetadataUpdateFunc func(channel string, chaincodes chaincode.MetadataSet)
func (handleMetadataUpdate HandleMetadataUpdateFunc) HandleMetadataUpdate(channel string, chaincodes chaincode.MetadataSet) {
handleMetadataUpdate(channel, chaincodes)
}
type Enumerator interface {
Enumerate() ([]chaincode.InstalledChaincode, error)
}
type EnumerateFunc func() ([]chaincode.InstalledChaincode, error)
func (enumerate EnumerateFunc) Enumerate() ([]chaincode.InstalledChaincode, error) {
return enumerate()
}
type Query interface {
GetState(namespace string, key string) ([]byte, error)
Done()
}
type QueryCreator interface {
NewQuery() (Query, error)
}
type QueryCreatorFunc func() (Query, error)
func (queryCreator QueryCreatorFunc) NewQuery() (Query, error) {
return queryCreator()
}
func NewMetadataManager(installedChaincodes Enumerator) (*MetadataManager, error) {
installedCCs, err := installedChaincodes.Enumerate()
if err != nil {
return nil, errors.Wrap(err, "failed listing installed chaincodes")
}
return &MetadataManager{
installedCCs: installedCCs,
deployedCCsByChannel: map[string]*chaincode.MetadataMapping{},
queryCreatorsByChannel: map[string]QueryCreator{},
}, nil
}
func (m *MetadataManager) Metadata(channel string, cc string, collections bool) *chaincode.Metadata {
queryCreator := m.queryCreatorsByChannel[channel]
if queryCreator == nil {
Logger.Warning("Requested Metadata for non-existent channel", channel)
return nil
}
if md, found := m.deployedCCsByChannel[channel].Lookup(cc); found && !collections {
Logger.Debug("Returning metadata for channel", channel, ", chaincode", cc, ":", md)
return &md
}
query, err := queryCreator.NewQuery()
if err != nil {
Logger.Error("Failed obtaining new query for channel", channel, ":", err)
return nil
}
md, err := DeployedChaincodes(query, AcceptAll, collections, cc)
if err != nil {
Logger.Error("Failed querying LSCC for channel", channel, ":", err)
return nil
}
if len(md) == 0 {
Logger.Info("Chaincode", cc, "isn't defined in channel", channel)
return nil
}
return &md[0]
}
func (m *MetadataManager) initMetadataForChannel(channel string, queryCreator QueryCreator) error {
if m.isChannelMetadataInitialized(channel) {
return nil
}
query, err := queryCreator.NewQuery()
if err != nil {
return errors.WithStack(err)
}
ccs, err := queryChaincodeDefinitions(query, m.installedCCs, DeployedChaincodes)
if err != nil {
return errors.WithStack(err)
}
m.createMetadataForChannel(channel, queryCreator)
m.updateState(channel, ccs)
return nil
}
func (m *MetadataManager) createMetadataForChannel(channel string, newQuery QueryCreator) {
m.Lock()
defer m.Unlock()
m.deployedCCsByChannel[channel] = chaincode.NewMetadataMapping()
m.queryCreatorsByChannel[channel] = newQuery
}
func (m *MetadataManager) isChannelMetadataInitialized(channel string) bool {
m.RLock()
defer m.RUnlock()
_, exists := m.deployedCCsByChannel[channel]
return exists
}
func (m *MetadataManager) updateState(channel string, ccUpdate chaincode.MetadataSet) {
m.RLock()
defer m.RUnlock()
for _, cc := range ccUpdate {
m.deployedCCsByChannel[channel].Update(cc)
}
}
func (m *MetadataManager) fireChangeListeners(channel string) {
m.RLock()
md := m.deployedCCsByChannel[channel]
m.RUnlock()
for _, listener := range m.listeners {
aggregatedMD := md.Aggregate()
listener.HandleMetadataUpdate(channel, aggregatedMD)
}
Logger.Debug("Listeners for channel", channel, "invoked")
}
func (m *MetadataManager) NewChannelSubscription(channel string, queryCreator QueryCreator) (*Subscription, error) {
sub := &Subscription{
metadataManager: m,
channel: channel,
queryCreator: queryCreator,
}
if err := m.initMetadataForChannel(channel, queryCreator); err != nil {
return nil, errors.WithStack(err)
}
m.fireChangeListeners(channel)
return sub, nil
}
func (m *MetadataManager) AddListener(listener MetadataChangeListener) {
m.Lock()
defer m.Unlock()
m.listeners = append(m.listeners, listener)
}