github.com/kaituanwang/hyperledger@v2.0.1+incompatible/core/chaincode/testdata/src/chaincodes/passthru/passthru.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/hyperledger/fabric-chaincode-go/shim"
    23  	pb "github.com/hyperledger/fabric-protos-go/peer"
    24  )
    25  
    26  // PassthruChaincode passes thru invoke and query to another chaincode where
    27  //     called ChaincodeID = args[0]
    28  //     called chaincode's function = args[1]
    29  //     called chaincode's args = args[2:len-2]
    30  //     called ChannelID = args[len-1]
    31  type PassthruChaincode struct {
    32  }
    33  
    34  func toChaincodeArgs(args ...string) [][]byte {
    35  	bargs := make([][]byte, len(args))
    36  	for i, arg := range args {
    37  		bargs[i] = []byte(arg)
    38  	}
    39  	return bargs
    40  }
    41  
    42  func (p *PassthruChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
    43  	fmt.Println("passthru Init")
    44  	function, _ := stub.GetFunctionAndParameters()
    45  	return shim.Success([]byte(function))
    46  }
    47  
    48  // helper
    49  func (p *PassthruChaincode) iq(stub shim.ChaincodeStubInterface, chaincode string, args []string, channel string) pb.Response {
    50  	return stub.InvokeChaincode(chaincode, toChaincodeArgs(args...), channel)
    51  }
    52  
    53  // Invoke passes through the invoke call
    54  // The chaincode ID to call MUST be specified as first argument
    55  // The channel ID to call the chaincode on MUST be specified as the last argument
    56  func (p *PassthruChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
    57  	args := stub.GetStringArgs()
    58  	fmt.Println("passthru Invoke ", args)
    59  
    60  	if len(args) < 2 {
    61  		return shim.Error("Channel to call on not provided")
    62  	}
    63  	channelToCallOn := args[len(args)-1]
    64  	if len(args) < 1 {
    65  		return shim.Error("Chaincode to call not provided")
    66  	}
    67  	chaincodeToCall := args[0]
    68  
    69  	response := p.iq(stub, chaincodeToCall, args[1:len(args)-1], channelToCallOn)
    70  	if response.Status != shim.OK {
    71  		msg := response.Message
    72  		if response.Payload != nil {
    73  			msg = string(response.Payload)
    74  		}
    75  		errStr := fmt.Sprintf("Failed to invoke chaincode. Got error: %s", msg)
    76  		fmt.Printf(errStr)
    77  		return shim.Error(errStr)
    78  	}
    79  	return response
    80  }
    81  
    82  func main() {
    83  	err := shim.Start(new(PassthruChaincode))
    84  	if err != nil {
    85  		fmt.Printf("Error starting Passthru chaincode: %s", err)
    86  	}
    87  }