forked from hyperledger/fabric-sdk-go
/
connection.go
executable file
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/
connection.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package comm
import (
"sync/atomic"
"github.com/pkg/errors"
"github.com/hyperledger/fabric-sdk-go/pkg/common/logging"
"github.com/hyperledger/fabric-sdk-go/pkg/common/options"
fabcontext "github.com/hyperledger/fabric-sdk-go/pkg/common/providers/context"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
"github.com/hyperledger/fabric-sdk-go/pkg/context"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config/comm"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config/endpoint"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
var logger = logging.NewLogger("fabsdk/fab")
const (
// GRPC max message size (same as Fabric)
maxCallRecvMsgSize = 100 * 1024 * 1024
maxCallSendMsgSize = 100 * 1024 * 1024
)
// StreamProvider creates a GRPC stream
type StreamProvider func(conn *grpc.ClientConn) (grpc.ClientStream, error)
// GRPCConnection manages the GRPC connection and client stream
type GRPCConnection struct {
context fabcontext.Client
chConfig fab.ChannelCfg
conn *grpc.ClientConn
stream grpc.ClientStream
commManager fab.CommManager
tlsCertHash []byte
done int32
}
// NewConnection creates a new connection
func NewConnection(ctx fabcontext.Client, chConfig fab.ChannelCfg, streamProvider StreamProvider, url string, opts ...options.Opt) (*GRPCConnection, error) {
if url == "" {
return nil, errors.New("server URL not specified")
}
params := defaultParams()
options.Apply(params, opts)
dialOpts, err := newDialOpts(ctx.Config(), url, params)
if err != nil {
return nil, err
}
reqCtx, cancel := context.NewRequest(ctx, context.WithTimeout(params.connectTimeout))
defer cancel()
commManager, ok := context.RequestCommManager(reqCtx)
if !ok {
return nil, errors.New("unable to get comm manager")
}
grpcconn, err := commManager.DialContext(reqCtx, endpoint.ToAddress(url), dialOpts...)
if err != nil {
return nil, errors.Wrapf(err, "could not connect to %s", url)
}
stream, err := streamProvider(grpcconn)
if err != nil {
commManager.ReleaseConn(grpcconn)
return nil, errors.Wrapf(err, "could not create stream to %s", url)
}
if stream == nil {
return nil, errors.New("unexpected nil stream received from provider")
}
return &GRPCConnection{
context: ctx,
chConfig: chConfig,
commManager: commManager,
conn: grpcconn,
stream: stream,
tlsCertHash: comm.TLSCertHash(ctx.Config()),
}, nil
}
// ChannelConfig returns the channel configuration
func (c *GRPCConnection) ChannelConfig() fab.ChannelCfg {
return c.chConfig
}
// Close closes the connection
func (c *GRPCConnection) Close() {
if !c.setClosed() {
logger.Debugf("Already closed")
return
}
logger.Debug("Closing stream....")
if err := c.stream.CloseSend(); err != nil {
logger.Warnf("error closing GRPC stream: %s", err)
}
logger.Debug("Releasing connection....")
c.commManager.ReleaseConn(c.conn)
logger.Debug("... connection successfully closed.")
}
// Closed returns true if the connection has been closed
func (c *GRPCConnection) Closed() bool {
return atomic.LoadInt32(&c.done) == 1
}
func (c *GRPCConnection) setClosed() bool {
return atomic.CompareAndSwapInt32(&c.done, 0, 1)
}
// Stream returns the GRPC stream
func (c *GRPCConnection) Stream() grpc.Stream {
return c.stream
}
// TLSCertHash returns the hash of the TLS cert
func (c *GRPCConnection) TLSCertHash() []byte {
return c.tlsCertHash
}
// Context returns the context of the client establishing the connection
func (c *GRPCConnection) Context() fabcontext.Client {
return c.context
}
func newDialOpts(config core.Config, url string, params *params) ([]grpc.DialOption, error) {
var dialOpts []grpc.DialOption
if params.keepAliveParams.Time > 0 || params.keepAliveParams.Timeout > 0 {
dialOpts = append(dialOpts, grpc.WithKeepaliveParams(params.keepAliveParams))
}
dialOpts = append(dialOpts, grpc.WithDefaultCallOptions(grpc.FailFast(params.failFast)))
if endpoint.AttemptSecured(url, params.insecure) {
tlsConfig, err := comm.TLSConfig(params.certificate, params.hostOverride, config)
if err != nil {
return nil, err
}
dialOpts = append(dialOpts, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)))
logger.Debugf("Creating a secure connection to [%s] with TLS HostOverride [%s]", url, params.hostOverride)
} else {
logger.Debugf("Creating an insecure connection [%s]", url)
dialOpts = append(dialOpts, grpc.WithInsecure())
}
dialOpts = append(dialOpts, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(maxCallRecvMsgSize),
grpc.MaxCallSendMsgSize(maxCallSendMsgSize)))
return dialOpts, nil
}