github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/core/chaincode/exectransaction.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 chaincode
    18  
    19  import (
    20  	"errors"
    21  	"fmt"
    22  	"time"
    23  
    24  	"github.com/golang/protobuf/proto"
    25  	"golang.org/x/net/context"
    26  
    27  	"github.com/hyperledger/fabric/core/chaincode/shim"
    28  	"github.com/hyperledger/fabric/core/common/ccprovider"
    29  	"github.com/hyperledger/fabric/events/producer"
    30  	pb "github.com/hyperledger/fabric/protos/peer"
    31  )
    32  
    33  //Execute - execute proposal, return original response of chaincode
    34  func Execute(ctxt context.Context, cccid *ccprovider.CCContext, spec interface{}) (*pb.Response, *pb.ChaincodeEvent, error) {
    35  	var err error
    36  	var cds *pb.ChaincodeDeploymentSpec
    37  	var ci *pb.ChaincodeInvocationSpec
    38  
    39  	//init will call the Init method of a on a chain
    40  	cctyp := pb.ChaincodeMessage_INIT
    41  	if cds, _ = spec.(*pb.ChaincodeDeploymentSpec); cds == nil {
    42  		if ci, _ = spec.(*pb.ChaincodeInvocationSpec); ci == nil {
    43  			panic("Execute should be called with deployment or invocation spec")
    44  		}
    45  		cctyp = pb.ChaincodeMessage_TRANSACTION
    46  	}
    47  
    48  	cID, cMsg, err := theChaincodeSupport.Launch(ctxt, cccid, spec)
    49  	if err != nil {
    50  		return nil, nil, fmt.Errorf("%s", err)
    51  	}
    52  
    53  	//this should work because it worked above...
    54  	chaincode := cID.Name
    55  
    56  	if err != nil {
    57  		return nil, nil, fmt.Errorf("Failed to stablish stream to container %s", chaincode)
    58  	}
    59  
    60  	// TODO: Need to comment next line and uncomment call to getTimeout, when transaction blocks are being created
    61  	timeout := time.Duration(30000) * time.Millisecond
    62  
    63  	if err != nil {
    64  		return nil, nil, fmt.Errorf("Failed to retrieve chaincode spec(%s)", err)
    65  	}
    66  
    67  	var ccMsg *pb.ChaincodeMessage
    68  	ccMsg, err = createCCMessage(cctyp, cccid.TxID, cMsg)
    69  	if err != nil {
    70  		return nil, nil, fmt.Errorf("Failed to transaction message(%s)", err)
    71  	}
    72  
    73  	resp, err := theChaincodeSupport.Execute(ctxt, cccid, ccMsg, timeout)
    74  	if err != nil {
    75  		// Rollback transaction
    76  		return nil, nil, fmt.Errorf("Failed to execute transaction (%s)", err)
    77  	} else if resp == nil {
    78  		// Rollback transaction
    79  		return nil, nil, fmt.Errorf("Failed to receive a response for (%s)", cccid.TxID)
    80  	}
    81  
    82  	if resp.ChaincodeEvent != nil {
    83  		resp.ChaincodeEvent.ChaincodeId = cccid.Name
    84  		resp.ChaincodeEvent.TxId = cccid.TxID
    85  	}
    86  
    87  	if resp.Type == pb.ChaincodeMessage_COMPLETED {
    88  		res := &pb.Response{}
    89  		unmarshalErr := proto.Unmarshal(resp.Payload, res)
    90  		if unmarshalErr != nil {
    91  			return nil, nil, fmt.Errorf("Failed to unmarshal response for (%s): %s", cccid.TxID, unmarshalErr)
    92  		}
    93  
    94  		// Success
    95  		return res, resp.ChaincodeEvent, nil
    96  	} else if resp.Type == pb.ChaincodeMessage_ERROR {
    97  		// Rollback transaction
    98  		return nil, resp.ChaincodeEvent, fmt.Errorf("Transaction returned with failure: %s", string(resp.Payload))
    99  	}
   100  
   101  	//TODO - this should never happen ... a panic is more appropriate but will save that for future
   102  	return nil, nil, fmt.Errorf("receive a response for (%s) but in invalid state(%d)", cccid.TxID, resp.Type)
   103  }
   104  
   105  // ExecuteWithErrorFilter is similar to Execute, but filters error contained in chaincode response and returns Payload of response only.
   106  // Mostly used by unit-test.
   107  func ExecuteWithErrorFilter(ctxt context.Context, cccid *ccprovider.CCContext, spec interface{}) ([]byte, *pb.ChaincodeEvent, error) {
   108  	res, event, err := Execute(ctxt, cccid, spec)
   109  	if err != nil {
   110  		chaincodeLogger.Errorf("ExecuteWithErrorFilter %s error: %s", cccid.Name, err)
   111  		return nil, nil, err
   112  	}
   113  
   114  	if res == nil {
   115  		chaincodeLogger.Errorf("ExecuteWithErrorFilter %s get nil response without error", cccid.Name)
   116  		return nil, nil, err
   117  	}
   118  
   119  	if res.Status != shim.OK {
   120  		return nil, nil, fmt.Errorf("%s", res.Message)
   121  	}
   122  
   123  	return res.Payload, event, nil
   124  }
   125  
   126  // GetSecureContext returns the security context from the context object or error
   127  // Security context is nil if security is off from core.yaml file
   128  // func GetSecureContext(ctxt context.Context) (crypto.Peer, error) {
   129  // 	var err error
   130  // 	temp := ctxt.Value("security")
   131  // 	if nil != temp {
   132  // 		if secCxt, ok := temp.(crypto.Peer); ok {
   133  // 			return secCxt, nil
   134  // 		}
   135  // 		err = errors.New("Failed to convert security context type")
   136  // 	}
   137  // 	return nil, err
   138  // }
   139  
   140  var errFailedToGetChainCodeSpecForTransaction = errors.New("Failed to get ChainCodeSpec from Transaction")
   141  
   142  func sendTxRejectedEvent(tx *pb.Transaction, errorMsg string) {
   143  	producer.Send(producer.CreateRejectionEvent(tx, errorMsg))
   144  }