forked from hyperledger/fabric-sdk-go
/
eventhubclient.go
executable file
·113 lines (89 loc) · 3.16 KB
/
eventhubclient.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package eventhubclient
import (
"time"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/context"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/events/api"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/events/client"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/events/endpoint"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/events/eventhubclient/connection"
"github.com/hyperledger/fabric-sdk-go/pkg/common/logging"
"github.com/hyperledger/fabric-sdk-go/pkg/common/options"
"github.com/hyperledger/fabric-sdk-go/pkg/fab/events/eventhubclient/dispatcher"
"github.com/pkg/errors"
)
var logger = logging.NewLogger("fabsdk/fab")
var ehConnProvider = func(context context.Client, chConfig fab.ChannelCfg, peer fab.Peer) (api.Connection, error) {
eventEndpoint, ok := peer.(api.EventEndpoint)
if !ok {
panic("peer is not an EventEndpoint")
}
return connection.New(context, chConfig, eventEndpoint.EventURL(), eventEndpoint.Opts()...)
}
// Client connects to a peer and receives channel events, such as bock, filtered block, chaincode, and transaction status events.
type Client struct {
client.Client
params
}
// New returns a new event hub client
func New(context context.Client, chConfig fab.ChannelCfg, discovery fab.DiscoveryService, opts ...options.Opt) (*Client, error) {
params := defaultParams()
// FIXME: Temporarily set the default to block events since Fabric 1.0 does
// not support filtered block events
opts = append(opts, client.WithBlockEvents())
options.Apply(params, opts)
// Use a custom Discovery Service which wraps the given discovery service
// and produces event endpoints containing the event URL and
// additional GRPC options.
discoveryWrapper, err := endpoint.NewEndpointDiscoveryWrapper(
context, chConfig.ID(), discovery,
endpoint.WithTargetFilter(newMSPFilter(context.Identifier().MSPID)))
if err != nil {
return nil, err
}
client := &Client{
Client: *client.New(
dispatcher.New(context, chConfig, discoveryWrapper, params.connProvider, opts...),
opts...,
),
params: *params,
}
client.SetAfterConnectHandler(client.registerInterests)
if err := client.Start(); err != nil {
return nil, err
}
return client, nil
}
func (c *Client) registerInterests() error {
logger.Debug("sending register interests request....")
errch := make(chan error)
if err := c.Submit(dispatcher.NewRegisterInterestsEvent(c.interests, errch)); err != nil {
logger.Errorf("unable to submit new register interests events: %s", err)
return err
}
var err error
select {
case err = <-errch:
case <-time.After(c.respTimeout):
err = errors.New("timeout waiting for register interests response")
}
if err != nil {
logger.Errorf("unable to send register interests request: %s", err)
return err
}
logger.Debug("successfully sent register interests")
return nil
}
type mspFilter struct {
mspID string
}
func newMSPFilter(mspID string) *mspFilter {
return &mspFilter{mspID: mspID}
}
func (f *mspFilter) Accept(peer fab.Peer) bool {
return peer.MSPID() == f.mspID
}