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extcc_handler.go
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/
extcc_handler.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package extcc
import (
"context"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/core/comm"
"github.com/hyperledger/fabric/core/container/ccintf"
"github.com/pkg/errors"
pb "github.com/hyperledger/fabric-protos-go/peer"
"google.golang.org/grpc"
)
var extccLogger = flogging.MustGetLogger("extcc")
// StreamHandler handles the `Chaincode` gRPC service with peer as client
type StreamHandler interface {
HandleChaincodeStream(stream ccintf.ChaincodeStream) error
}
type ExternalChaincodeRuntime struct {
}
// createConnection - standard grpc client creating using ClientConfig info (surprised there isn't
// a helper method for this)
func (i *ExternalChaincodeRuntime) createConnection(ccid string, ccinfo *ccintf.ChaincodeServerInfo) (*grpc.ClientConn, error) {
grpcClient, err := comm.NewGRPCClient(ccinfo.ClientConfig)
if err != nil {
return nil, errors.WithMessagef(err, "error creating grpc client to %s", ccid)
}
conn, err := grpcClient.NewConnection(ccinfo.Address)
if err != nil {
return nil, errors.WithMessagef(err, "error creating grpc connection to %s", ccinfo.Address)
}
extccLogger.Debugf("Created external chaincode connection: %s", ccid)
return conn, nil
}
func (i *ExternalChaincodeRuntime) Stream(ccid string, ccinfo *ccintf.ChaincodeServerInfo, sHandler StreamHandler) error {
extccLogger.Debugf("Starting external chaincode connection: %s", ccid)
conn, err := i.createConnection(ccid, ccinfo)
if err != nil {
return errors.WithMessagef(err, "error cannot create connection for %s", ccid)
}
defer conn.Close()
//create the client and start streaming
client := pb.NewChaincodeClient(conn)
stream, err := client.Connect(context.Background())
if err != nil {
return errors.WithMessagef(err, "error creating grpc client connection to %s", ccid)
}
//peer as client has to initiate the stream. Rest of the process is unchanged
sHandler.HandleChaincodeStream(stream)
extccLogger.Debugf("External chaincode %s client exited", ccid)
return nil
}