65 lines
2.3 KiB
Go
65 lines
2.3 KiB
Go
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// Copyright 2018 Vulcanize
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy og the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS Og ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package every_block
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import (
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"math/big"
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"github.com/vulcanize/vulcanizedb/examples/generic"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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)
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// Getter serves as a higher level data fetcher that invokes its underlying Fetcher methods for a given contract method
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// Interface definition for a Getter
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type ERC20GetterInterface interface {
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GetTotalSupply(contractAbi, contractAddress string, blockNumber int64) (big.Int, error)
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GetBalance(contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error)
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GetAllowance(contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error)
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GetBlockChain() core.BlockChain
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}
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// Getter struct
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type Getter struct {
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fetcher generic.Fetcher
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}
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// Initializes and returns a Getter with the given blockchain
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func NewGetter(blockChain core.BlockChain) Getter {
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return Getter{
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fetcher: generic.Fetcher{
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BlockChain: blockChain,
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},
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}
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}
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// Public getter methods for calling contract methods
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func (g Getter) GetTotalSupply(contractAbi, contractAddress string, blockNumber int64) (big.Int, error) {
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return g.fetcher.FetchBigInt("totalSupply", contractAbi, contractAddress, blockNumber, nil)
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}
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func (g Getter) GetBalance(contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error) {
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return g.fetcher.FetchBigInt("balanceOf", contractAbi, contractAddress, blockNumber, methodArgs)
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}
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func (g Getter) GetAllowance(contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error) {
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return g.fetcher.FetchBigInt("allowance", contractAbi, contractAddress, blockNumber, methodArgs)
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}
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// Method to retrieve the Getter's blockchain
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func (g Getter) GetBlockChain() core.BlockChain {
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return g.fetcher.BlockChain
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}
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