github.com/inklabsfoundation/inkchain@v0.17.1-0.20181025012015-c3cef8062f19/examples/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  	"strings"
    22  
    23  	"github.com/inklabsfoundation/inkchain/common/util"
    24  	"github.com/inklabsfoundation/inkchain/core/chaincode/shim"
    25  	pb "github.com/inklabsfoundation/inkchain/protos/peer"
    26  )
    27  
    28  // PassthruChaincode passes thru invoke and query to another chaincode where
    29  //     called ChaincodeID = function
    30  //     called chaincode's function = args[0]
    31  //     called chaincode's args = args[1:]
    32  type PassthruChaincode struct {
    33  }
    34  
    35  //Init func will return error if function has string "error" anywhere
    36  func (p *PassthruChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
    37  	function, _ := stub.GetFunctionAndParameters()
    38  	if strings.Index(function, "error") >= 0 {
    39  		return shim.Error(function)
    40  	}
    41  	return shim.Success([]byte(function))
    42  }
    43  
    44  //helper
    45  func (p *PassthruChaincode) iq(stub shim.ChaincodeStubInterface, function string, args []string) pb.Response {
    46  	if function == "" {
    47  		return shim.Error("Chaincode ID not provided")
    48  	}
    49  	chaincodeID := function
    50  
    51  	return stub.InvokeChaincode(chaincodeID, util.ToChaincodeArgs(args...), "")
    52  }
    53  
    54  // Invoke passes through the invoke call
    55  func (p *PassthruChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
    56  	function, args := stub.GetFunctionAndParameters()
    57  	return p.iq(stub, function, args)
    58  }
    59  
    60  func main() {
    61  	err := shim.Start(new(PassthruChaincode))
    62  	if err != nil {
    63  		fmt.Printf("Error starting Passthru chaincode: %s", err)
    64  	}
    65  }