serve.go

// The erisdb package contains tendermint-specific services that goes with the
// server.
package erisdb

import (
	"bytes"
	"path"

	sm "github.com/eris-ltd/eris-db/state"
	stypes "github.com/eris-ltd/eris-db/state/types"
	. "github.com/tendermint/go-common"
	cfg "github.com/tendermint/go-config"
	dbm "github.com/tendermint/go-db"
	"github.com/tendermint/go-events"
	"github.com/tendermint/go-p2p"
	"github.com/tendermint/go-wire"
	"github.com/tendermint/log15"
	tmcfg "github.com/tendermint/tendermint/config/tendermint"
	"github.com/tendermint/tendermint/node"

	ep "github.com/eris-ltd/eris-db/erisdb/pipe"
	"github.com/eris-ltd/eris-db/server"

	edbapp "github.com/eris-ltd/eris-db/tmsp"
	tmsp "github.com/tendermint/tmsp/server"
)

const ERISDB_VERSION = "0.11.5"
const TENDERMINT_VERSION = "0.5.0"

var log = log15.New("module", "eris/erisdb_server")
var tmConfig cfg.Config

// This function returns a properly configured ErisDb server process,
// with a tmsp listener for talking to tendermint core.
// To start listening for incoming requests, call 'Start()' on the process.
// Make sure to register any start event listeners first
func ServeErisDB(workDir string) (*server.ServeProcess, error) {
	log.Info("ErisDB Serve initializing.")
	errEns := EnsureDir(workDir, 0777)

	if errEns != nil {
		return nil, errEns
	}

	var sConf *server.ServerConfig

	sConfPath := path.Join(workDir, "server_conf.toml")
	if !FileExists(sConfPath) {
		log.Info("No server configuration, using default.")
		log.Info("Writing to: " + sConfPath)
		sConf = server.DefaultServerConfig()
		errW := server.WriteServerConfig(sConfPath, sConf)
		if errW != nil {
			panic(errW)
		}
	} else {
		var errRSC error
		sConf, errRSC = server.ReadServerConfig(sConfPath)
		if errRSC != nil {
			log.Error("Server config file error.", "error", errRSC.Error())
		}
	}

	// Get tendermint configuration
	// TODO replace
	tmConfig = tmcfg.GetConfig(workDir)
	tmConfig.Set("version", TENDERMINT_VERSION)
	cfg.ApplyConfig(tmConfig) // Notify modules of new config

	// Set the node up.
	// nodeRd := make(chan struct{})
	// nd := node.NewNode()

	// Load the application state
	// The app state used to be managed by tendermint node,
	// but is now managed by ErisDB.
	// The tendermint core only stores the blockchain (history of txs)
	stateDB := dbm.GetDB("state")
	state := sm.LoadState(stateDB)
	var genDoc *stypes.GenesisDoc
	if state == nil {
		genDoc, state = sm.MakeGenesisStateFromFile(stateDB, config.GetString("genesis_file"))
		state.Save()
		// write the gendoc to db
		buf, n, err := new(bytes.Buffer), new(int), new(error)
		wire.WriteJSON(genDoc, buf, n, err)
		stateDB.Set(stypes.GenDocKey, buf.Bytes())
		if *err != nil {
			Exit(Fmt("Unable to write gendoc to db: %v", err))
		}
	} else {
		genDocBytes := stateDB.Get(stypes.GenDocKey)
		err := new(error)
		wire.ReadJSONPtr(&genDoc, genDocBytes, err)
		if *err != nil {
			Exit(Fmt("Unable to read gendoc from db: %v", err))
		}
	}
	// add the chainid to the global config
	config.Set("chain_id", state.ChainID)

	evsw := events.NewEventSwitch()
	evsw.Start()
	app := edbapp.NewErisDBApp(state, evsw)
	app.SetHostAddress(sConf.Consensus.TendermintHost)

	// Start the tmsp listener for state update commands
	go func() {
		// TODO config
		_, err := tmsp.NewServer(sConf.Consensus.TMSPListener, app)
		if err != nil {
			// TODO: play nice
			Exit(err.Error())
		}
	}()

	// Load supporting objects.
	pipe := ep.NewPipe(app, evsw)
	codec := &TCodec{}
	evtSubs := NewEventSubscriptions(pipe.Events())
	// The services.
	tmwss := NewErisDbWsService(codec, pipe)
	tmjs := NewErisDbJsonService(codec, pipe, evtSubs)
	// The servers.
	jsonServer := NewJsonRpcServer(tmjs)
	restServer := NewRestServer(codec, pipe, evtSubs)
	wsServer := server.NewWebSocketServer(sConf.WebSocket.MaxWebSocketSessions, tmwss)
	// Create a server process.
	proc := server.NewServeProcess(sConf, jsonServer, restServer, wsServer)

	//stopChan := proc.StopEventChannel()
	//go startNode(nd, nodeRd, stopChan)
	//<-nodeRd
	return proc, nil
}

// Private. Create a new node.
func startNode(nd *node.Node, ready chan struct{}, shutDown <-chan struct{}) {
	laddr := tmConfig.GetString("node_laddr")
	if laddr != "" {
		l := p2p.NewDefaultListener("tcp", laddr, tmConfig.GetBool("skip_upnp"))
		nd.AddListener(l)
	}

	nd.Start()

	/*
			// If seedNode is provided by config, dial out.
			// should be handled by core

		if len(tmConfig.GetString("seeds")) > 0 {
				nd.DialSeed()
			}*/

	if len(tmConfig.GetString("rpc_laddr")) > 0 {
		nd.StartRPC()
	}
	ready <- struct{}{}
	// Block until everything is shut down.
	<-shutDown
	nd.Stop()
}