ipld-eth-server/examples/erc20_watcher/every_block/fetcher.go
Rob Mulholand a683e45855 Consolidate test doubles
- Migrate various mocks of core namespaces to shared version in `fakes` pkg
- Err on the side of making test doubles less sophisticated
- Don't pull over mocks of namespaces that are only used in example code
2018-07-20 11:37:46 -05:00

72 lines
1.8 KiB
Go

// Copyright 2018 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package every_block
import (
"fmt"
"log"
"math/big"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
type ERC20FetcherInterface interface {
FetchSupplyOf(contractAbi string, contractAddress string, blockNumber int64) (big.Int, error)
GetBlockChain() core.BlockChain
}
func NewFetcher(blockchain core.BlockChain) Fetcher {
return Fetcher{
Blockchain: blockchain,
}
}
type Fetcher struct {
Blockchain core.BlockChain
ContractAbi string
ContractAddress string
}
type fetcherError struct {
err string
fetchMethod string
}
func (fe *fetcherError) Error() string {
return fmt.Sprintf("Error fetching %s: %s", fe.fetchMethod, fe.err)
}
func newFetcherError(err error, fetchMethod string) *fetcherError {
e := fetcherError{err.Error(), fetchMethod}
log.Println(e.Error())
return &e
}
func (f Fetcher) FetchSupplyOf(contractAbi string, contractAddress string, blockNumber int64) (big.Int, error) {
method := "totalSupply"
var result = new(big.Int)
err := f.Blockchain.FetchContractData(contractAbi, contractAddress, method, nil, &result, blockNumber)
if err != nil {
return *result, newFetcherError(err, method)
}
return *result, nil
}
func (f Fetcher) GetBlockChain() core.BlockChain {
return f.Blockchain
}