package ethrpc import ( "encoding/json" "errors" "github.com/ethereum/eth-go/ethpub" _ "log" ) 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) value := state.GetStorage(args.Key) *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 }