package comms import ( "fmt" "net" "github.com/ethereum/go-ethereum/rpc/api" "github.com/ethereum/go-ethereum/rpc/codec" "github.com/ethereum/go-ethereum/rpc/shared" "encoding/json" ) type IpcConfig struct { Endpoint string } type ipcClient struct { endpoint string codec codec.Codec coder codec.ApiCoder } func (self *ipcClient) Close() { self.coder.Close() } func (self *ipcClient) Send(req interface{}) error { var err error if r, ok := req.(*shared.Request); ok { if err = self.coder.WriteResponse(r); err != nil { if _, ok := err.(*net.OpError); ok { // connection lost, retry once if err = self.reconnect(); err == nil { err = self.coder.WriteResponse(r) } } } return err } return fmt.Errorf("Invalid request (%T)", req) } func (self *ipcClient) Recv() (interface{}, error) { res, err := self.coder.ReadResponse() if err != nil { return nil, err } if r, ok := res.(shared.SuccessResponse); ok { return r.Result, nil } if r, ok := res.(shared.ErrorResponse); ok { return r.Error, nil } return res, err } func (self *ipcClient) SupportedModules() (map[string]string, error) { req := shared.Request{ Id: 1, Jsonrpc: "2.0", Method: "modules", } if err := self.coder.WriteResponse(req); err != nil { return nil, err } res, err := self.coder.ReadResponse() if err != nil { return nil, err } if sucRes, ok := res.(shared.SuccessResponse); ok { data, _ := json.Marshal(sucRes.Result) modules := make(map[string]string) err = json.Unmarshal(data, &modules) if err == nil { return modules, nil } } return nil, fmt.Errorf("Invalid response") } // Create a new IPC client, UNIX domain socket on posix, named pipe on Windows func NewIpcClient(cfg IpcConfig, codec codec.Codec) (*ipcClient, error) { return newIpcClient(cfg, codec) } // Start IPC server func StartIpc(cfg IpcConfig, codec codec.Codec, apis ...api.EthereumApi) error { offeredApi := api.Merge(apis...) return startIpc(cfg, codec, offeredApi) }