[FAB-2861]: Add list channels command to peer cli

In order to be able to retrieve list of channels peer joined to this
commit add new peer cli command to issue get channels cscc proposal.

E.g.:

      peer channel list

will result with list of channels peer is part of.

Change-Id: I0383c7233ebd630b8d401147878be29cb484580b
Signed-off-by: Artem Barger <[email protected]>

Author: C0rWin

peer/channel/channel.go

@@ -54,6 +54,7 @@ func Cmd(cf *ChannelCmdFactory) *cobra.Command {
 	channelCmd.AddCommand(joinCmd(cf))
 	channelCmd.AddCommand(createCmd(cf))
 	channelCmd.AddCommand(fetchCmd(cf))
+	channelCmd.AddCommand(listCmd(cf))
 
 	return channelCmd
 }

peer/channel/list.go

@@ -0,0 +1,112 @@
+/*
+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 (
+	"errors"
+	"fmt"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/hyperledger/fabric/core/scc/cscc"
+	common2 "github.com/hyperledger/fabric/protos/common"
+	pb "github.com/hyperledger/fabric/protos/peer"
+	"github.com/hyperledger/fabric/protos/utils"
+	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
+)
+
+type endorserClient struct {
+	cf *ChannelCmdFactory
+}
+
+func (cc *endorserClient) getChannels() ([]*pb.ChannelInfo, error) {
+	var err error
+
+	invocation := &pb.ChaincodeInvocationSpec{
+		ChaincodeSpec: &pb.ChaincodeSpec{
+			Type:        pb.ChaincodeSpec_Type(pb.ChaincodeSpec_Type_value["GOLANG"]),
+			ChaincodeId: &pb.ChaincodeID{Name: "cscc"},
+			Input:       &pb.ChaincodeInput{Args: [][]byte{[]byte(cscc.GetChannels)}},
+		},
+	}
+
+	var prop *pb.Proposal
+	c, _ := cc.cf.Signer.Serialize()
+	prop, _, err = utils.CreateProposalFromCIS(common2.HeaderType_ENDORSER_TRANSACTION, "", invocation, c)
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Cannot create proposal, due to %s", err))
+	}
+
+	var signedProp *pb.SignedProposal
+	signedProp, err = utils.GetSignedProposal(prop, cc.cf.Signer)
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Cannot create signed proposal, due to %s", err))
+	}
+
+	proposalResp, err := cc.cf.EndorserClient.ProcessProposal(context.Background(), signedProp)
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Failed sending proposal, got %s", err))
+	}
+
+	if proposalResp.Response == nil || proposalResp.Response.Status != 200 {
+		return nil, errors.New(fmt.Sprint("Received bad response, status", proposalResp.Response.Status))
+	}
+
+	var channelQueryResponse pb.ChannelQueryResponse
+	err = proto.Unmarshal(proposalResp.Response.Payload, &channelQueryResponse)
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Cannot read channels list response, %s", err))
+	}
+
+	return channelQueryResponse.Channels, nil
+}
+
+func listCmd(cf *ChannelCmdFactory) *cobra.Command {
+	// Set the flags on the channel start command.
+
+	return &cobra.Command{
+		Use:   "list",
+		Short: "List of channels peer has been joined to.",
+		Long:  "List of channels peer has been joined to.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return list(cf)
+		},
+	}
+}
+
+func list(cf *ChannelCmdFactory) error {
+	var err error
+	if cf == nil {
+		cf, err = InitCmdFactory(true)
+		if err != nil {
+			return err
+		}
+	}
+
+	client := &endorserClient{cf}
+
+	if channels, err := client.getChannels(); err != nil {
+		return err
+	} else {
+		fmt.Println("Channels peers has joined to:")
+		for _, channel := range channels {
+			fmt.Println("\t", channel.ChannelId)
+		}
+	}
+
+	return nil
+}

peer/channel/list_test.go

@@ -0,0 +1,50 @@
+package channel
+
+import (
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/hyperledger/fabric/peer/common"
+	pb "github.com/hyperledger/fabric/protos/peer"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestListChannels(t *testing.T) {
+	InitMSP()
+
+	mockChannelResponse := &pb.ChannelQueryResponse{
+		Channels: []*pb.ChannelInfo{{
+			ChannelId: "TEST_LIST_CHANNELS",
+		}},
+	}
+
+	mockPayload, err := proto.Marshal(mockChannelResponse)
+
+	assert.NoError(t, err)
+
+	mockResponse := &pb.ProposalResponse{
+		Response: &pb.Response{
+			Status:  200,
+			Payload: mockPayload,
+		},
+		Endorsement: &pb.Endorsement{},
+	}
+
+	signer, err := common.GetDefaultSigner()
+	assert.NoError(t, err)
+
+	mockCF := &ChannelCmdFactory{
+		EndorserClient:   common.GetMockEndorserClient(mockResponse, nil),
+		BroadcastFactory: mockBroadcastClientFactory,
+		Signer:           signer,
+	}
+
+	cmd := listCmd(mockCF)
+
+	AddFlags(cmd)
+
+	if err := cmd.Execute(); err != nil {
+		t.Fail()
+		t.Error(err)
+	}
+}