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channel.go
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channel.go
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/*
Copyright IBM Corp. 2017 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package channel
import (
"fmt"
"strings"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/msp"
"github.com/hyperledger/fabric/peer/common"
ab "github.com/hyperledger/fabric/protos/orderer"
pb "github.com/hyperledger/fabric/protos/peer"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
channelFuncName = "channel"
shortDes = "Operate a channel: create|fetch|join|list|update."
longDes = "Operate a channel: create|fetch|join|list|update."
)
var logger = flogging.MustGetLogger("channelCmd")
type OrdererRequirement bool
type EndorserRequirement bool
const (
EndorserRequired EndorserRequirement = true
EndorserNotRequired EndorserRequirement = false
OrdererRequired OrdererRequirement = true
OrdererNotRequired OrdererRequirement = false
)
var (
// join related variables.
genesisBlockPath string
// create related variables
chainID string
channelTxFile string
orderingEndpoint string
tls bool
caFile string
timeout int
)
// Cmd returns the cobra command for Node
func Cmd(cf *ChannelCmdFactory) *cobra.Command {
AddFlags(channelCmd)
channelCmd.AddCommand(createCmd(cf))
channelCmd.AddCommand(fetchCmd(cf))
channelCmd.AddCommand(joinCmd(cf))
channelCmd.AddCommand(listCmd(cf))
channelCmd.AddCommand(updateCmd(cf))
return channelCmd
}
// AddFlags adds flags for create and join
func AddFlags(cmd *cobra.Command) {
flags := cmd.PersistentFlags()
flags.StringVarP(&orderingEndpoint, "orderer", "o", "", "Ordering service endpoint")
flags.BoolVarP(&tls, "tls", "", false, "Use TLS when communicating with the orderer endpoint")
flags.StringVarP(&caFile, "cafile", "", "", "Path to file containing PEM-encoded trusted certificate(s) for the ordering endpoint")
}
var flags *pflag.FlagSet
func init() {
resetFlags()
}
// Explicitly define a method to facilitate tests
func resetFlags() {
flags = &pflag.FlagSet{}
flags.StringVarP(&genesisBlockPath, "blockpath", "b", common.UndefinedParamValue, "Path to file containing genesis block")
flags.StringVarP(&chainID, "channelID", "c", common.UndefinedParamValue, "In case of a newChain command, the channel ID to create.")
flags.StringVarP(&channelTxFile, "file", "f", "", "Configuration transaction file generated by a tool such as configtxgen for submitting to orderer")
flags.IntVarP(&timeout, "timeout", "t", 5, "Channel creation timeout")
}
func attachFlags(cmd *cobra.Command, names []string) {
cmdFlags := cmd.Flags()
for _, name := range names {
if flag := flags.Lookup(name); flag != nil {
cmdFlags.AddFlag(flag)
} else {
logger.Fatalf("Could not find flag '%s' to attach to commond '%s'", name, cmd.Name())
}
}
}
var channelCmd = &cobra.Command{
Use: channelFuncName,
Short: fmt.Sprint(shortDes),
Long: fmt.Sprint(longDes),
}
type BroadcastClientFactory func() (common.BroadcastClient, error)
// ChannelCmdFactory holds the clients used by ChannelCmdFactory
type ChannelCmdFactory struct {
EndorserClient pb.EndorserClient
Signer msp.SigningIdentity
BroadcastClient common.BroadcastClient
DeliverClient deliverClientIntf
BroadcastFactory BroadcastClientFactory
}
// InitCmdFactory init the ChannelCmdFactory with clients to endorser and orderer according to params
func InitCmdFactory(isEndorserRequired EndorserRequirement, isOrdererRequired OrdererRequirement) (*ChannelCmdFactory, error) {
var err error
cmdFact := &ChannelCmdFactory{}
cmdFact.Signer, err = common.GetDefaultSignerFnc()
if err != nil {
return nil, fmt.Errorf("Error getting default signer: %s", err)
}
cmdFact.BroadcastFactory = func() (common.BroadcastClient, error) {
return common.GetBroadcastClientFnc(orderingEndpoint, tls, caFile)
}
//for join and list, we need the endorser as well
if isEndorserRequired {
cmdFact.EndorserClient, err = common.GetEndorserClientFnc()
if err != nil {
return nil, fmt.Errorf("Error getting endorser client %s: %s", channelFuncName, err)
}
}
//for create and fetch, we need the orderer as well
if isOrdererRequired {
if len(strings.Split(orderingEndpoint, ":")) != 2 {
return nil, fmt.Errorf("Ordering service endpoint %s is not valid or missing", orderingEndpoint)
}
var opts []grpc.DialOption
// check for TLS
if tls {
if caFile != "" {
creds, err := credentials.NewClientTLSFromFile(caFile, "")
if err != nil {
return nil, fmt.Errorf("Error connecting to %s due to %s", orderingEndpoint, err)
}
opts = append(opts, grpc.WithTransportCredentials(creds))
}
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(orderingEndpoint, opts...)
if err != nil {
return nil, err
}
client, err := ab.NewAtomicBroadcastClient(conn).Deliver(context.TODO())
if err != nil {
return nil, fmt.Errorf("Error connecting due to %s", err)
}
cmdFact.DeliverClient = newDeliverClient(conn, client, chainID)
}
logger.Infof("Endorser and orderer connections initialized")
return cmdFact, nil
}