github.com/yacovm/fabric@v2.0.0-alpha.0.20191128145320-c5d4087dc723+incompatible/core/scc/throttle.go (about)

     1  /*
     2  Copyright IBM Corp. All Rights Reserved.
     3  
     4  SPDX-License-Identifier: Apache-2.0
     5  */
     6  
     7  package scc
     8  
     9  import (
    10  	"context"
    11  
    12  	"github.com/hyperledger/fabric-chaincode-go/shim"
    13  	pb "github.com/hyperledger/fabric-protos-go/peer"
    14  	"github.com/hyperledger/fabric/common/semaphore"
    15  )
    16  
    17  func Throttle(limit int, systemCC SelfDescribingSysCC) *ThrottledSysCC {
    18  	return &ThrottledSysCC{
    19  		SelfDescribingSysCC: systemCC,
    20  		semaphore:           semaphore.New(limit),
    21  	}
    22  }
    23  
    24  type ThrottledSysCC struct {
    25  	SelfDescribingSysCC
    26  	semaphore semaphore.Semaphore
    27  }
    28  
    29  func (t *ThrottledSysCC) Chaincode() shim.Chaincode {
    30  	return &ThrottledChaincode{
    31  		chaincode: t.SelfDescribingSysCC.Chaincode(),
    32  		semaphore: t.semaphore,
    33  	}
    34  }
    35  
    36  type ThrottledChaincode struct {
    37  	chaincode shim.Chaincode
    38  	semaphore semaphore.Semaphore
    39  }
    40  
    41  func (t *ThrottledChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
    42  	return t.chaincode.Init(stub)
    43  }
    44  
    45  func (t *ThrottledChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
    46  	if err := t.semaphore.Acquire(context.Background()); err != nil {
    47  		return shim.Error(err.Error())
    48  	}
    49  	defer t.semaphore.Release()
    50  
    51  	return t.chaincode.Invoke(stub)
    52  }