增加一个计算erc20转账价格的接口

src/chain/BlockChain.ts

@@ -1,5 +1,4 @@
 import { singleton } from 'decorators/singleton'
-import logger from 'logger/logger'
 import { TaskType } from 'models/RequestTask'
 import { ConfirmQueue } from 'queue/confirm.queue'
 import Web3 from 'web3'
@@ -9,6 +8,7 @@ import { ERC721Reactor } from './ERC721Reactor'
 import { HttpRetryProvider } from './HttpRetryProvider'
 import { WalletReactor } from './WalletReactor'
 import { DistributorReactor } from './DistributorReactor'
+import { fromTokenMinimalUnit } from 'utils/number.util'
 
 @singleton
 export class BlockChain {
@@ -96,4 +96,11 @@ export class BlockChain {
     }
     return abi
   }
+
+  public async generateGasShow(gas: any) {
+    let price = await this.web3.eth.getGasPrice()
+    let ehtBN = this.web3.utils.toBN(price).mul(this.web3.utils.toBN(gas))
+    let eth = fromTokenMinimalUnit(ehtBN, 18)
+    return { gas, price, eth }
+  }
 }

src/chain/ERC20Reactor.ts

@@ -135,6 +135,12 @@ export class ERC20Reactor {
     })
   }
 
+  async calcTransferGas({ address }: { address: string }) {
+    const contract = new this.web3.eth.Contract(abiFt, address, { from: this.account.address })
+    let gas = await contract.methods.transferFrom(this.account.address, this.account.address, 0).estimateGas()
+    return gas
+  }
+
   async mint({
     address,
     to,

src/controllers/token.controllers.ts

@@ -0,0 +1,16 @@
+import BaseController from 'common/base.controller'
+import { role, router } from 'decorators/router'
+import { BlockChain } from 'chain/BlockChain'
+import { ZError } from 'common/ZError'
+
+class TokenController extends BaseController {
+  @role('anon')
+  @router('post /chain/estimate_transfer_gas')
+  async calcGasPrice(req, res) {
+    const { address } = req.params
+    let gas = await new BlockChain().erc20Reactor.calcTransferGas({ address })
+    let data = await new BlockChain().generateGasShow(gas)
+    return data
+  }
+}
+export default TokenController