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package ethrpc
import (
"encoding/json"
"errors"
"github.com/ethereum/eth-go/ethpub"
"github.com/ethereum/eth-go/ethutil"
"math/big"
)
type EthereumApi struct {
ethp *ethpub.PEthereum
}
type JsonArgs interface {
requirements() error
}
type BlockResponse struct {
JsonResponse
}
type GetBlockArgs struct {
BlockNumber int
Hash string
}
type ErrorResponse struct {
Error bool `json:"error"`
ErrorText string `json:"errorText"`
}
type JsonResponse interface {
}
type SuccessRes struct {
Error bool `json:"error"`
Result JsonResponse `json:"result"`
}
func NewSuccessRes(object JsonResponse) string {
e := SuccessRes{Error: false, Result: object}
res, err := json.Marshal(e)
if err != nil {
// This should never happen
panic("Creating json error response failed, help")
}
success := string(res)
return success
}
func NewErrorResponse(msg string) error {
e := ErrorResponse{Error: true, ErrorText: msg}
res, err := json.Marshal(e)
if err != nil {
// This should never happen
panic("Creating json error response failed, help")
}
newErr := errors.New(string(res))
return newErr
}
func (b *GetBlockArgs) requirements() error {
if b.BlockNumber == 0 && b.Hash == "" {
return NewErrorResponse("GetBlock requires either a block 'number' or a block 'hash' as argument")
}
return nil
}
func (p *EthereumApi) GetBlock(args *GetBlockArgs, reply *string) error {
err := args.requirements()
if err != nil {
return err
}
// Do something
block := p.ethp.GetBlock(args.Hash)
*reply = NewSuccessRes(block)
return nil
}
type NewTxArgs struct {
Sec string
Recipient string
Value string
Gas string
GasPrice string
Init string
Body string
}
type TxResponse struct {
Hash string
}
func (a *NewTxArgs) requirements() error {
if a.Recipient == "" {
return NewErrorResponse("Transact requires a 'recipient' address as argument")
}
if a.Value == "" {
return NewErrorResponse("Transact requires a 'value' as argument")
}
if a.Gas == "" {
return NewErrorResponse("Transact requires a 'gas' value as argument")
}
if a.GasPrice == "" {
return NewErrorResponse("Transact requires a 'gasprice' value as argument")
}
return nil
}
func (a *NewTxArgs) requirementsContract() error {
if a.Value == "" {
return NewErrorResponse("Create requires a 'value' as argument")
}
if a.Gas == "" {
return NewErrorResponse("Create requires a 'gas' value as argument")
}
if a.GasPrice == "" {
return NewErrorResponse("Create requires a 'gasprice' value as argument")
}
if a.Body == "" {
return NewErrorResponse("Create requires a 'body' value as argument")
}
return nil
}
func (p *EthereumApi) Transact(args *NewTxArgs, reply *string) error {
err := args.requirements()
if err != nil {
return err
}
result, _ := p.ethp.Transact(p.ethp.GetKey().PrivateKey, args.Recipient, args.Value, args.Gas, args.GasPrice, args.Body)
*reply = NewSuccessRes(result)
return nil
}
func (p *EthereumApi) Create(args *NewTxArgs, reply *string) error {
err := args.requirementsContract()
if err != nil {
return err
}
result, _ := p.ethp.Create(p.ethp.GetKey().PrivateKey, args.Value, args.Gas, args.GasPrice, args.Init, args.Body)
*reply = NewSuccessRes(result)
return nil
}
func (p *EthereumApi) GetKey(args interface{}, reply *string) error {
*reply = NewSuccessRes(p.ethp.GetKey())
return nil
}
type GetStorageArgs struct {
Address string
Key string
}
func (a *GetStorageArgs) requirements() error {
if a.Address == "" {
return NewErrorResponse("GetStorageAt requires an 'address' value as argument")
}
if a.Key == "" {
return NewErrorResponse("GetStorageAt requires an 'key' value as argument")
}
return nil
}
type GetStorageAtRes struct {
Key string `json:"key"`
Value string `json:"value"`
Address string `json:"address"`
}
func (p *EthereumApi) GetStorageAt(args *GetStorageArgs, reply *string) error {
err := args.requirements()
if err != nil {
return err
}
state := p.ethp.GetStateObject(args.Address)
// Convert the incoming string (which is a bigint) into hex
i, _ := new(big.Int).SetString(args.Key, 10)
hx := ethutil.Hex(i.Bytes())
value := state.GetStorage(hx)
*reply = NewSuccessRes(GetStorageAtRes{Address: args.Address, Key: args.Key, Value: value})
return nil
}
type GetBalanceArgs struct {
Address string
}
func (a *GetBalanceArgs) requirements() error {
if a.Address == "" {
return NewErrorResponse("GetBalanceAt requires an 'address' value as argument")
}
return nil
}
type BalanceRes struct {
Balance string `json:"balance"`
Address string `json:"address"`
}
func (p *EthereumApi) GetBalanceAt(args *GetBalanceArgs, reply *string) error {
err := args.requirements()
if err != nil {
return err
}
state := p.ethp.GetStateObject(args.Address)
*reply = NewSuccessRes(BalanceRes{Balance: state.Value(), Address: args.Address})
return nil
}
type TestRes struct {
JsonResponse `json:"-"`
Answer int `json:"answer"`
}
func (p *EthereumApi) Test(args *GetBlockArgs, reply *string) error {
*reply = NewSuccessRes(TestRes{Answer: 15})
return nil
}
|
