forked from hyperledger/fabric-sdk-go
/
reference.go
105 lines (88 loc) · 2.72 KB
/
reference.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package membership
import (
"time"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
"github.com/hyperledger/fabric-sdk-go/pkg/util/concurrent/lazyref"
"github.com/pkg/errors"
)
// Ref membership reference that refreshes to load the given channel config reference
type Ref struct {
*lazyref.Reference
chConfigRef *lazyref.Reference
context Context
// Note: the following variables are only accessed from Ref.initializer which is synchronized
configBlockNumber uint64
mem fab.ChannelMembership
}
// NewRef returns a new membership reference
func NewRef(refresh time.Duration, context Context, chConfigRef *lazyref.Reference) *Ref {
ref := &Ref{
chConfigRef: chConfigRef,
context: context,
}
ref.Reference = lazyref.New(
ref.initializer(),
lazyref.WithRefreshInterval(lazyref.InitImmediately, refresh),
)
return ref
}
// Validate calls validate on the underlying reference
func (ref *Ref) Validate(serializedID []byte) error {
membership, err := ref.get()
if err != nil {
return err
}
return membership.Validate(serializedID)
}
// Verify calls validate on the underlying reference
func (ref *Ref) Verify(serializedID []byte, msg []byte, sig []byte) error {
membership, err := ref.get()
if err != nil {
return err
}
return membership.Verify(serializedID, msg, sig)
}
// ContainsMSP checks if given MSP is available in the underlying reference
func (ref *Ref) ContainsMSP(msp string) bool {
membership, err := ref.get()
if err != nil {
logger.Debugf("Failed to check ContainsMSP, err: %s", err)
return false
}
return membership.ContainsMSP(msp)
}
func (ref *Ref) get() (fab.ChannelMembership, error) {
m, err := ref.Get()
if err != nil {
return nil, err
}
return m.(fab.ChannelMembership), nil
}
func (ref *Ref) initializer() lazyref.Initializer {
return func() (interface{}, error) {
logger.Debugf("Initializing membership reference...")
channelCfg, err := ref.chConfigRef.Get()
if err != nil {
return nil, errors.WithMessage(err, "could not get channel config from reference")
}
cfg, ok := channelCfg.(fab.ChannelCfg)
if !ok {
return nil, errors.New("chConfigRef.Get() returned unexpected value ")
}
logger.Debugf("Got config block with number %d have %d", cfg.BlockNumber(), ref.configBlockNumber)
// Membership is refreshed only if we have a newer config block
if ref.mem == nil || cfg.BlockNumber() > ref.configBlockNumber {
logger.Debugf("Creating membership for channel [%s]...", cfg.ID())
ref.mem, err = New(ref.context, cfg)
if err != nil {
return nil, err
}
ref.configBlockNumber = cfg.BlockNumber()
}
return ref.mem, nil
}
}