forked from cerc-io/ipld-eth-server
77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
package geth
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import (
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"errors"
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"io/ioutil"
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"strings"
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/ethereum/go-ethereum/accounts/abi"
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)
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var (
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ErrInvalidAbiFile = errors.New("invalid abi")
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ErrMissingAbiFile = errors.New("missing abi")
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ErrApiRequestFailed = errors.New("etherscan api request failed")
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)
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type Response struct {
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Status string
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Message string
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Result string
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}
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type EtherScanApi struct {
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client *http.Client
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url string
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}
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func NewEtherScanClient(url string) *EtherScanApi {
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return &EtherScanApi{
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client: &http.Client{Timeout: 10 * time.Second},
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url: url,
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}
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}
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//https://api.etherscan.io/api?module=contract&action=getabi&address=%s
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func (e *EtherScanApi) GetAbi(contractHash string) (string, error) {
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target := new(Response)
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request := fmt.Sprintf("%s/api?module=contract&action=getabi&address=%s", e.url, contractHash)
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r, err := e.client.Get(request)
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if err != nil {
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return "", ErrApiRequestFailed
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}
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defer r.Body.Close()
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json.NewDecoder(r.Body).Decode(&target)
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return target.Result, nil
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}
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func ParseAbiFile(abiFilePath string) (abi.ABI, error) {
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abiString, err := ReadAbiFile(abiFilePath)
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if err != nil {
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return abi.ABI{}, ErrMissingAbiFile
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}
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return ParseAbi(abiString)
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}
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func ParseAbi(abiString string) (abi.ABI, error) {
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parsedAbi, err := abi.JSON(strings.NewReader(abiString))
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if err != nil {
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return abi.ABI{}, ErrInvalidAbiFile
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}
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return parsedAbi, nil
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}
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func ReadAbiFile(abiFilePath string) (string, error) {
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filesBytes, err := ioutil.ReadFile(abiFilePath)
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if err != nil {
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return "", ErrMissingAbiFile
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}
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return string(filesBytes), nil
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}
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