/
handler.go
222 lines (192 loc) · 7.1 KB
/
handler.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package producer
import (
"fmt"
"math"
"strconv"
"time"
"github.com/golang/protobuf/proto"
"github.com/pkg/errors"
"github.com/hyperledger/fabric/common/crypto"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/msp/mgmt"
pb "github.com/hyperledger/fabric/protos/peer"
)
type handler struct {
ChatStream pb.Events_ChatServer
interestedEvents map[string]*pb.Interest
sessionEndTime time.Time
RemoteAddr string
eventProcessor *eventProcessor
}
func newHandler(stream pb.Events_ChatServer, ep *eventProcessor) *handler {
h := &handler{
ChatStream: stream,
interestedEvents: map[string]*pb.Interest{},
RemoteAddr: util.ExtractRemoteAddress(stream.Context()),
eventProcessor: ep,
}
logger.Debug("event handler created for", h.RemoteAddr)
return h
}
func getInterestKey(interest pb.Interest) string {
var key string
switch interest.EventType {
case pb.EventType_BLOCK:
key = "/" + strconv.Itoa(int(pb.EventType_BLOCK))
case pb.EventType_FILTEREDBLOCK:
key = "/" + strconv.Itoa(int(pb.EventType_FILTEREDBLOCK))
default:
logger.Errorf("unsupported interest type: %s", interest.EventType)
}
return key
}
func (h *handler) register(iMsg []*pb.Interest) error {
// Could consider passing interest array to registerHandler
// and only lock once for entire array here
for _, v := range iMsg {
if err := h.eventProcessor.registerHandler(v, h); err != nil {
logger.Errorf("could not register %s for %s: %s", v, h.RemoteAddr, err)
continue
}
h.interestedEvents[getInterestKey(*v)] = v
}
return nil
}
func (h *handler) deregister(iMsg []*pb.Interest) error {
for _, v := range iMsg {
if err := h.eventProcessor.deregisterHandler(v, h); err != nil {
logger.Errorf("could not deregister %s for %s: %s", v, h.RemoteAddr, err)
continue
}
delete(h.interestedEvents, getInterestKey(*v))
}
return nil
}
// HandleMessage handles the Openchain messages for the Peer.
func (h *handler) HandleMessage(msg *pb.SignedEvent) error {
evt, err := h.validateEventMessage(msg)
if err != nil {
return fmt.Errorf("event message validation failed for %s: %s", h.RemoteAddr, err)
}
switch evt.Event.(type) {
case *pb.Event_Register:
eventsObj := evt.GetRegister()
if err := h.register(eventsObj.Events); err != nil {
return fmt.Errorf("could not register events for %s: %s", h.RemoteAddr, err)
}
case *pb.Event_Unregister:
eventsObj := evt.GetUnregister()
if err := h.deregister(eventsObj.Events); err != nil {
return fmt.Errorf("could not deregister events for %s: %s", h.RemoteAddr, err)
}
case nil:
default:
return fmt.Errorf("invalid type from received from %s: %T", h.RemoteAddr, evt.Event)
}
// just return the received msg to confirm registration/deregistration
if err := h.SendMessageWithTimeout(evt, h.eventProcessor.SendTimeout); err != nil {
return fmt.Errorf("error sending response to %s: %s", h.RemoteAddr, err)
}
return nil
}
// SendMessageWithTimeout sends a message to a remote peer but will time out
// if it takes longer than the timeout
func (h *handler) SendMessageWithTimeout(msg *pb.Event, timeout time.Duration) error {
errChan := make(chan error, 1)
go func() {
errChan <- h.sendMessage(msg)
}()
t := time.NewTimer(timeout)
select {
case <-t.C:
logger.Warningf("timed out sending event to %s", h.RemoteAddr)
return fmt.Errorf("timed out sending event")
case err := <-errChan:
t.Stop()
return err
}
}
// sendMessage sends a message to the remote PEER through the stream
func (h *handler) sendMessage(msg *pb.Event) error {
logger.Debug("sending event to", h.RemoteAddr)
err := h.ChatStream.Send(msg)
if err != nil {
logger.Debugf("sending event failed for %s: %s", h.RemoteAddr, err)
return fmt.Errorf("error sending message through ChatStream: %s", err)
}
logger.Debug("event sent successfully to", h.RemoteAddr)
return nil
}
func (h *handler) hasSessionExpired() bool {
now := time.Now()
if !h.sessionEndTime.IsZero() && now.After(h.sessionEndTime) {
err := errors.Errorf("Client identity has expired for %s", h.RemoteAddr)
logger.Warning(err.Error())
return true
}
return false
}
// Validates event messages by validating the Creator and verifying
// the signature. Returns the unmarshaled Event object
// Validation of the creator identity's validity is done by checking with local MSP to ensure the
// submitter is a member in the same organization as the peer
//
// TODO: ideally this should also check each channel's "Readers" policy to ensure the identity satisfies
// each channel's access control policy. This step is necessary because the registered listener is going
// to get read access to all channels by receiving Block events from all channels.
// However, this is not being done for v1.0 due to complexity concerns and the need to complex a stable,
// minimally viable release. Eventually events will be made channel-specific, at which point this method
// should be revisited
func (h *handler) validateEventMessage(signedEvt *pb.SignedEvent) (*pb.Event, error) {
logger.Debugf("validating for signed event %p", signedEvt)
// messages from the client for registering and unregistering must be signed
// and accompanied by the signing certificate in the "Creator" field
evt := &pb.Event{}
err := proto.Unmarshal(signedEvt.EventBytes, evt)
if err != nil {
return nil, fmt.Errorf("error unmarshaling the event bytes in the SignedEvent: %s", err)
}
expirationTime := crypto.ExpiresAt(evt.Creator)
if !expirationTime.IsZero() && time.Now().After(expirationTime) {
return nil, fmt.Errorf("identity expired")
}
h.sessionEndTime = expirationTime
if evt.GetTimestamp() != nil {
evtTime := time.Unix(evt.GetTimestamp().Seconds, int64(evt.GetTimestamp().Nanos)).UTC()
peerTime := time.Now()
if math.Abs(float64(peerTime.UnixNano()-evtTime.UnixNano())) > float64(h.eventProcessor.TimeWindow.Nanoseconds()) {
logger.Warningf("Message timestamp %s more than %s apart from current server time %s", evtTime, h.eventProcessor.TimeWindow, peerTime)
return nil, fmt.Errorf("message timestamp out of acceptable range. must be within %s of current server time", h.eventProcessor.TimeWindow)
}
}
err = h.eventProcessor.BindingInspector(h.ChatStream.Context(), evt)
if err != nil {
return nil, err
}
localMSP := mgmt.GetLocalMSP()
principalGetter := mgmt.NewLocalMSPPrincipalGetter()
// Load MSPPrincipal for policy
principal, err := principalGetter.Get(mgmt.Members)
if err != nil {
return nil, fmt.Errorf("failed getting local MSP principal [member]: %s", err)
}
id, err := localMSP.DeserializeIdentity(evt.Creator)
if err != nil {
return nil, fmt.Errorf("failed deserializing event creator: %s", err)
}
// Verify that event's creator satisfies the principal
err = id.SatisfiesPrincipal(principal)
if err != nil {
return nil, fmt.Errorf("failed verifying the creator satisfies local MSP's [member] principal: %s", err)
}
// Verify the signature
err = id.Verify(signedEvt.EventBytes, signedEvt.Signature)
if err != nil {
return nil, fmt.Errorf("failed verifying the event signature: %s", err)
}
return evt, nil
}