path: root/rpc/comms/inproc.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package comms

import (
    "fmt"

    "github.com/ethereum/go-ethereum/rpc/codec"
    "github.com/ethereum/go-ethereum/rpc/shared"
)

type InProcClient struct {
    api         shared.EthereumApi
    codec       codec.Codec
    lastId      interface{}
    lastJsonrpc string
    lastErr     error
    lastRes     interface{}
}

// Create a new in process client
func NewInProcClient(codec codec.Codec) *InProcClient {
    return &InProcClient{
        codec: codec,
    }
}

func (self *InProcClient) Close() {
    // do nothing
}

// Need to setup api support
func (self *InProcClient) Initialize(offeredApi shared.EthereumApi) {
    self.api = offeredApi
}

func (self *InProcClient) Send(req interface{}) error {
    if r, ok := req.(*shared.Request); ok {
        self.lastId = r.Id
        self.lastJsonrpc = r.Jsonrpc
        self.lastRes, self.lastErr = self.api.Execute(r)
        return self.lastErr
    }

    return fmt.Errorf("Invalid request (%T)", req)
}

func (self *InProcClient) Recv() (interface{}, error) {
    return *shared.NewRpcResponse(self.lastId, self.lastJsonrpc, self.lastRes, self.lastErr), nil
}

func (self *InProcClient) SupportedModules() (map[string]string, error) {
    req := shared.Request{
        Id:      1,
        Jsonrpc: "2.0",
        Method:  "modules",
    }

    if res, err := self.api.Execute(&req); err == nil {
        if result, ok := res.(map[string]string); ok {
            return result, nil
        }
    } else {
        return nil, err
    }

    return nil, fmt.Errorf("Invalid response")
}