fabic(如何使用Hyperledger Fabic實現Token代幣)

Hyperledger Fabic 也能實現Token代幣

33.2.14.2.積分通正(代幣)

我發現用以太坊思維,將以太坊代幣合約搬到 hyperledger 上,一樣可以實現代幣的功能,這個代幣除了不能上交易所,基本滿足我們替代積分系統的需求,下面是我寫了這樣一個合約,在超級賬本上實現類似以太坊的代幣轉賬功能。

packagemainimport("bytes""encoding/json""fmt""strconv""github.com/hyperledger/fabric/core/chaincode/shim"sc"github.com/hyperledger/fabric/protos/peer")//DefinetheSmartContractstructuretypeSmartContractstruct{}typeTokenstruct{Ownerstring`json:"Owner"`TotalSupplyuint`json:"TotalSupply"`TokenNamestring`json:"TokenName"`TokenSymbolstring`json:"TokenSymbol"`BalanceOfmap[string]uint`json:"BalanceOf"`}func(token*Token)initialSupply(){token.BalanceOf[token.Owner]=token.TotalSupply;}func(token*Token)transfer(_fromstring,_tostring,_valueuint){if(token.BalanceOf[_from]>=_value){token.BalanceOf[_from]-=_value;token.BalanceOf[_to]+=_value;}}func(token*Token)balance(_fromstring)uint{returntoken.BalanceOf[_from]}func(token*Token)burn(_valueuint){if(token.BalanceOf[token.Owner]>=_value){token.BalanceOf[token.Owner]-=_value;token.TotalSupply-=_value;}}func(token*Token)burnFrom(_fromstring,_valueuint){if(token.BalanceOf[_from]>=_value){token.BalanceOf[_from]-=_value;token.TotalSupply-=_value;}}func(token*Token)mint(_valueuint){token.BalanceOf[token.Owner]+=_value;token.TotalSupply+=_value;}func(s*SmartContract)Init(stubshim.ChaincodeStubInterface)sc.Response{returnshim.Success(nil)}func(s*SmartContract)initLedger(stubshim.ChaincodeStubInterface)sc.Response{token:=&Token{Owner:"netkiller",TotalSupply:10000,TokenName:"代幣通正",TokenSymbol:"COIN",BalanceOf:map[string]uint{}}token.initialSupply()tokenAsBytes,_:=json.Marshal(token)stub.PutState("Token",tokenAsBytes)fmt.Println("Added",tokenAsBytes)returnshim.Success(nil)}func(s*SmartContract)transferToken(stubshim.ChaincodeStubInterface,args[]string)sc.Response{iflen(args)!=3{returnshim.Error("Incorrectnumberofarguments.Expecting2")}tokenAsBytes,_:=stub.GetState(args[0])token:=Token{}json.Unmarshal(tokenAsBytes,&token)token.transfer(args[1],args[2],args[3])tokenAsBytes,_=json.Marshal(token)stub.PutState(args[0],tokenAsBytes)returnshim.Success(nil)}func(s*SmartContract)balanceToken(stubshim.ChaincodeStubInterface,args[]string)sc.Response{iflen(args)!=1{returnshim.Error("Incorrectnumberofarguments.Expecting1")}tokenAsBytes,_:=stub.GetState(args[0])token:=Token{}json.Unmarshal(tokenAsBytes,&token)amount:=token.balance(args[1])returnshim.Success(amount)}func(s*SmartContract)Invoke(stubshim.ChaincodeStubInterface)sc.Response{//RetrievetherequestedSmartContractfunctionandargumentsfunction,args:=stub.GetFunctionAndParameters()//Routetotheappropriatehandlerfunctiontointeractwiththeledgerappropriatelyiffunction=="balanceToken"{returns.balanceToken(stub,args)}elseiffunction=="initLedger"{returns.initLedger(stub)}elseiffunction=="transferToken"{returns.transferToken(stub,args)}returnshim.Error("InvalidSmartContractfunctionname.")}//Themainfunctionisonlyrelevantinunittestmode.Onlyincludedhereforcompleteness.funcmain(){//CreateanewSmartContracterr:=shim.Start(new(SmartContract))iferr!=nil{fmt.Printf("ErrorcreatingnewSmartContract:%s",err)}}

合約代碼的測試

funcmain(){token:=&Token{Owner:"netkiller",//代幣管理者TotalSupply:10000,//代幣發行總量TokenName:"積分連",//代幣名稱TokenSymbol:"NEO",//代幣符號NEOBalanceOf:map[string]uint{}}token.initialSupply()//初始化代幣fmt.Println(token.balance("netkiller"))//查詢余額token.transfer("netkiller","neo",100)//轉賬,這里賬號使用用戶ID,沒有使用以太坊錢包那樣的哈希值,因為哈希值不便于記憶。fmt.Println(token.balance("netkiller"))fmt.Println(token.balance("neo"))}

我們可以建立很多套這樣的比,例如水果幣,蔬菜幣,流量幣...

開發一個小型交易所難度也不大,讓用戶在交易所中交易這些幣。