mylib use case

1. Local debug library：mylib

Description: Since the mylib library is packaged in the chain, the mylib.lua for developers is there to debug locally.

Guide: The following mylib.lua and the development contract file must be in the same directory

mylib.lua:

mylib = {}

    mylib.constant = "test11"

    function mylib.LogPrint(logTable)
        print("LogPrint" , logTable.key , logTable.value)
    end

    function mylib.GetCurTxAccount()
        return 0x01, 0x02, 0x03, 0x04, 0x05, 0x06
    end

    function mylib.GetBase58Addr(param)
        return 0x77,0x54,0x77,0x72,0x57,0x73,0x65,0x72,0x37,0x38,0x6d,0x45,0x61,0x32,0x32,0x66,0x38,0x6d,0x48,0x66,0x69,0x48,0x47,0x72,0x64,0x4b,0x79,0x73,0x54,0x76,0x38,0x65,0x42,0x55
    end

    function mylib.GetUserAppAccValue(param)
        return 0x00,0x08,0xaf, 0x2f, 0x00, 0x00, 0x00, 0x00
    end

    function mylib.ByteToInteger(param)
        return 10000000000
    end

    function mylib.IntegerToByte8(param)
        return 0x0f
    end

    function mylib.WriteOutAppOperate(param)
        print("param.userIdLen",param.userIdLen)
        return true
    end

    function mylib.WriteOutput(param)
        print("WriteOutput",param)
        return true
    end

    function mylib.GetScriptID()
        return 0x97,0x00,0x00,0x00,0x00,0x00,0x00,0x00
    end

    function mylib.GetCurTxPayAmount()
        return 0x97,0x00,0x00,0x00,0x00,0x00,0x00,0x00
    end

    function mylib.ModifyData(param)
        print("ModifyData: param.value" , param.value)
        return true
    end

    function mylib.WriteData(writeDbTbl)
        print("WriteData:", writeDbTbl.value)
        return true
    end

    function mylib.ReadData(param)
        print("ReadData param" , param)
        if(param=="admin") then
            return 0x77,0x54,0x77,0x72,0x57,0x73,0x65,0x72,0x37,0x38,0x6d,0x45,0x61,0x32,0x32,0x66,0x38,0x6d,0x48,0x66,0x69,0x48,0x47,0x72,0x64,0x4b,0x79,0x73,0x54,0x76,0x38,0x65,0x42,0x55
        elseif(param=="exchangeRate") then
            return 0x00,0xb7,0x07,0x84,0x03,0x00,0x00,0x00
        end
        return 0x97,0x00,0x00,0x00,0x00,0x00,0x00,0x00
    end

return mylib

2. LogMsg

Used to print log information to a file

Used API

• mylib.LogPrint

Code sample

LogMsg = function(LOG_TYPE.ENUM_STRING,Value)
    local LogTable = {
        key = 0, 
        length = 0,
        value = nil 
    }

    LogTable.key = LogType
    LogTable.length = #Value
    LogTable.value = Value
    mylib.LogPrint(LogTable)
end

3. GetCurrTxAccountAddress

Get caller address

Used API

• mylib.GetCurTxAccount
• mylib.GetBase58Addr

Code sample

GetCurrTxAccountAddress = function ()
    return {mylib.GetBase58Addr(mylib.GetCurTxAccount())}
end

Returns

4. GetFreeTokenCount

Get the free amount of the current account token

Used API

• mylib.GetUserAppAccValue
• mylib.ByteToInteger

Code sample

GetFreeTokenCount = function (accountTbl)
    local freeMoneyTbl = { mylib.GetUserAppAccValue( {idLen = #accountTbl, idValueTbl = accountTbl} ) }
    assert(TableIsNotEmpty(freeMoneyTbl), "GetUserAppAccValue error")
    return mylib.ByteToInteger(Unpack(freeMoneyTbl))
end

Returns

5. TransferToken

the current account Transfer token to destination address

Used API

• mylib.WriteOutAppOperate
• mylib.ByteToInteger

Code sample

OP_TYPE = {
    ADD_FREE     = 1,
    SUB_FREE     = 2
}

WriteAppData = function (opType, moneyTbl, userIdTbl)
    local appOperateTbl = {
      operatorType = opType,
      outHeight = 0,
      moneyTbl = moneyTbl,
      userIdLen = #userIdTbl,
      userIdTbl = userIdTbl,
      fundTagLen = 0,
      fundTagTbl = {}
    }
    assert(mylib.WriteOutAppOperate(appOperateTbl), "WriteAppData: ".. opType .." op err")
end

TransferToken = function (fromAddrTbl, toAddrTbl, moneyTbl)
    local money = mylib.ByteToInteger(Unpack(moneyTbl))
    assert(money > 0, money .. " <=0 error")
    local freeMoney = GetFreeTokenCount(fromAddrTbl)
    assert(freeMoney >= money, "Insufficient money to transfer in the account.")
    WriteAppData(OP_TYPE.SUB_FREE, moneyTbl, fromAddrTbl )
    WriteAppData(OP_TYPE.ADD_FREE, moneyTbl, toAddrTbl )
end

Parameters

Returns

• none

6. GetCurrTxPayAmount

Get the WICC amount transferred by the contract caller to the smart contract

Used API

• mylib.GetCurTxPayAmount
• mylib.ByteToInteger

Code sample

GetCurrTxPayAmount = function ()
    local payMoney = mylib.ByteToInteger(mylib.GetCurTxPayAmount())
    assert(payMoney > 0,"GetCurrTxPayAmount: payMoney <= 0")
    return payMoney
end

Returns

7. TransferToAddr

Transfer the WICC in the smart contract to the destination address

Used API

• mylib.WriteOutput
• mylib.GetScriptID

Code sample

ADDR_TYPE = {
    REGID  = 1,
    BASE58 = 2
}
OP_TYPE = {
    ADD_FREE = 1,
    SUB_FREE = 2
}

WriteAccountData = function (opType, addrType, accountIdTbl, moneyTbl)
  local writeOutputTbl = {
    addrType = addrType,
    accountIdTbl = accountIdTbl,
    operatorType = opType,
    outHeight = 0,
    moneyTbl = moneyTbl
  }
  assert(mylib.WriteOutput(writeOutputTbl),"WriteAccountData" .. opType .. " err")
end

TransferToAddr = function (addrType, accTbl, moneyTbl)
    assert(TableIsNotEmpty(accTbl), "WriteWithdrawal accTbl empty")
    assert(TableIsNotEmpty(moneyTbl), "WriteWithdrawal moneyTbl empty")
    WriteAccountData(OP_TYPE.ADD_FREE, addrType, accTbl, moneyTbl)
    local contractRegid = {mylib.GetScriptID()}
    WriteAccountData(OP_TYPE.SUB_FREE, ADDR_TYPE.REGID, contractRegid, moneyTbl)
    return true
end

Parameters

8. GetContractValue

Get the value of using “key” in the blockchain contract

Used API

• mylib.ReadData

Code sample

GetContractValue = function (key)
    assert(#key > 0, "Key is empty")

    local tValue = { mylib.ReadData(key) }
    if TableIsNotEmpty(tValue) then
      return true,tValue
    else
      LogMsg(LOG_TYPE.ENUM_STRING,"Key not exist.")
      return false,nil
    end
end

Parameters

Returns

9. WriteOrModify

Write/modify date in the blockChain

Used API

• mylib.WriteData(writeTbl)
• mylib.ModifyData(writeTbl)

Code sample

WriteOrModify = function (isConfig, writeTbl)
    if not isConfig then
      if not mylib.WriteData(writeTbl) then  error("WriteData error") end
    else
      if not mylib.ModifyData(writeTbl) then error("Modify error") end
    end
end

Parameters

Returns

• none

10. WriteStrkeyValueToDb

Write date into the blockChain

Code sample

WriteStrkeyValueToDb = function (Strkey,ValueTbl)
    local t = type(ValueTbl)
    assert(t == "table","the type of Value isn't table.")

    local writeTbl = {
        key = Strkey,
        length = #ValueTbl,
        value = {}
    }
    writeTbl.value = ValueTbl

    if not mylib.WriteData(writeTbl) then  error("WriteData error") end
end

Parameters

Returns

• none