core.go

// Copyright 2015, 2016 Eris Industries (UK) Ltd.
// This file is part of Eris-RT

// Eris-RT is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Eris-RT 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Eris-RT.  If not, see <http://www.gnu.org/licenses/>.

package core

import (
  "fmt"

  // TODO: [ben] swap out go-events with eris-db/event (currently unused)
  events "github.com/tendermint/go-events"

  log "github.com/eris-ltd/eris-logger"

  config         "github.com/eris-ltd/eris-db/config"
  consensus      "github.com/eris-ltd/eris-db/consensus"
  definitions    "github.com/eris-ltd/eris-db/definitions"
	event          "github.com/eris-ltd/eris-db/event"
  manager        "github.com/eris-ltd/eris-db/manager"
  // rpc_v0 is carried over from Eris-DBv0.11 and before on port 1337
  rpc_v0         "github.com/eris-ltd/eris-db/rpc/v0"
  // rpc_tendermint is carried over from Eris-DBv0.11 and before on port 46657
  // rpc_tendermint "github.com/eris-ltd/eris-db/rpc/tendermint"
  server         "github.com/eris-ltd/eris-db/server"
)

// Core is the high-level structure
type Core struct {
  chainId string
  evsw    *events.EventSwitch
  pipe    definitions.Pipe
}

func NewCore(chainId string, consensusConfig *config.ModuleConfig,
  managerConfig *config.ModuleConfig) (*Core, error) {
  // start new event switch, TODO: [ben] replace with eris-db/event
  evsw := events.NewEventSwitch()
  evsw.Start()

  // start a new application pipe that will load an application manager
  pipe, err := manager.NewApplicationPipe(managerConfig, evsw,
    consensusConfig.Version)
  if err != nil {
    return nil, fmt.Errorf("Failed to load application pipe: %v", err)
  }
  log.Debug("Loaded pipe with application manager")
  // pass the consensus engine into the pipe
  consensus.LoadConsensusEngineInPipe(consensusConfig, pipe)

  return &Core{
    chainId: chainId,
    evsw: evsw,
    pipe: pipe,
    }, nil
}

//------------------------------------------------------------------------------
// Explicit switch that can later be abstracted into an `Engine` definition
// where the Engine defines the explicit interaction of a specific application
// manager with a consensus engine.
// TODO: [ben] before such Engine abstraction,
// think about many-manager-to-one-consensus

//------------------------------------------------------------------------------
// Server functions
// NOTE: [ben] in phase 0 we exactly take over the full server architecture
// from Eris-DB and Tendermint; This is a draft and will be overhauled.

func (core *Core) NewGateway(config *server.ServerConfig) (*server.ServeProcess,
  error) {
  codec := &rpc_v0.TCodec{}
  eventSubscriptions := event.NewEventSubscriptions(core.pipe.Events())
  // The services.
  tmwss := rpc_v0.NewErisDbWsService(codec, core.pipe)
  tmjs := rpc_v0.NewErisDbJsonService(codec, core.pipe, eventSubscriptions)
  // The servers.
	jsonServer := rpc_v0.NewJsonRpcServer(tmjs)
	restServer := rpc_v0.NewRestServer(codec, core.pipe, eventSubscriptions)
	wsServer := server.NewWebSocketServer(config.WebSocket.MaxWebSocketSessions,
    tmwss)
	// Create a server process.
	proc, err := server.NewServeProcess(config, jsonServer, restServer, wsServer)
  if err != nil {
    return nil, fmt.Errorf("Failed to load gateway: %v", err)
  }

	return proc, nil
}


// func StartRPC(config cfg.Config, n *node.Node, edbApp *edbapp.ErisDBApp) ([]net.Listener, error) {
// 	rpccore.SetConfig(config)
//
// 	rpccore.SetErisDBApp(edbApp)
// 	rpccore.SetBlockStore(n.BlockStore())
// 	rpccore.SetConsensusState(n.ConsensusState())
// 	rpccore.SetConsensusReactor(n.ConsensusReactor())
// 	rpccore.SetMempoolReactor(n.MempoolReactor())
// 	rpccore.SetSwitch(n.Switch())
// 	rpccore.SetPrivValidator(n.PrivValidator())
// 	rpccore.SetGenDoc(LoadGenDoc(config.GetString("genesis_file")))
//
// 	listenAddrs := strings.Split(config.GetString("rpc_laddr"), ",")
//
// 	// we may expose the rpc over both a unix and tcp socket
// 	listeners := make([]net.Listener, len(listenAddrs))
// 	for i, listenAddr := range listenAddrs {
// 		mux := http.NewServeMux()
// 		wm := rpcserver.NewWebsocketManager(rpccore.Routes, n.EventSwitch())
// 		mux.HandleFunc("/websocket", wm.WebsocketHandler)
// 		rpcserver.RegisterRPCFuncs(mux, rpccore.Routes)
// 		listener, err := rpcserver.StartHTTPServer(listenAddr, mux)
// 		if err != nil {
// 			return nil, err
// 		}
// 		listeners[i] = listener
// 	}
// 	return listeners, nil
// }