proper integration of tick functionality

app/app.go

@@ -28,12 +28,16 @@ type Basecoin struct {
 	state *Store
 
 	handler sdk.Handler
+	tick    Ticker
 
 	pending []*abci.Validator
 	height  uint64
 	logger  log.Logger
 }
 
+// Ticker - tick function
+type Ticker func(sm.SimpleDB) ([]*abci.Validator, error)
+
 var _ abci.Application = &Basecoin{}
 
 // NewBasecoin - create a new instance of the basecoin application
@@ -46,6 +50,17 @@ func NewBasecoin(handler sdk.Handler, store *Store, logger log.Logger) *Basecoin
 	}
 }
 
+// NewBasecoinTick - create a new instance of the basecoin application with tick functionality
+func NewBasecoinTick(handler sdk.Handler, store *Store, logger log.Logger, tick Ticker) *Basecoin {
+	return &Basecoin{
+		handler: handler,
+		info:    sm.NewChainState(),
+		state:   store,
+		logger:  logger,
+		tick:    tick,
+	}
+}
+
 // GetChainID returns the currently stored chain
 func (app *Basecoin) GetChainID() string {
 	return app.info.GetChainID(app.state.Committed())
@@ -170,6 +185,14 @@ func (app *Basecoin) BeginBlock(req abci.RequestBeginBlock) {
 	// for _, plugin := range app.plugins.GetList() {
 	// 	plugin.BeginBlock(app.state, hash, header)
 	// }
+
+	if app.tick != nil {
+		diff, err := app.tick(app.state.Append())
+		if err != nil {
+			panic(err)
+		}
+		app.addValChange(diff)
+	}
 }
 
 // EndBlock - ABCI

server/commands/start.go

@@ -9,8 +9,8 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
-	sdk "github.com/cosmos/cosmos-sdk"
 	"github.com/tendermint/abci/server"
+	abci "github.com/tendermint/abci/types"
 	"github.com/tendermint/tmlibs/cli"
 	cmn "github.com/tendermint/tmlibs/common"
 
@@ -19,6 +19,7 @@ import (
 	"github.com/tendermint/tendermint/proxy"
 	"github.com/tendermint/tendermint/types"
 
+	sdk "github.com/cosmos/cosmos-sdk"
 	"github.com/cosmos/cosmos-sdk/app"
 )
 
@@ -29,6 +30,15 @@ var StartCmd = &cobra.Command{
 	RunE:  startCmd,
 }
 
+// TickStartCmd - command to create a start command with tick
+func TickStartCmd(tick app.Ticker) *cobra.Command {
+	return &cobra.Command{
+		Use:   "start",
+		Short: "Start this full node",
+		RunE:  tickStartCmd(tick),
+	}
+}
+
 // nolint TODO: move to config file
 const EyesCacheSize = 10000
 
@@ -52,6 +62,26 @@ func init() {
 	tcmd.AddNodeFlags(StartCmd)
 }
 
+//returns the start command which uses the tick
+func tickStartCmd(tick app.Ticker) func(cmd *cobra.Command, args []string) error {
+	return func(cmd *cobra.Command, args []string) error {
+		rootDir := viper.GetString(cli.HomeFlag)
+
+		store, err := app.NewStore(
+			path.Join(rootDir, "data", "merkleeyes.db"),
+			EyesCacheSize,
+			logger.With("module", "store"),
+		)
+		if err != nil {
+			return err
+		}
+
+		// Create Basecoin app
+		basecoinApp := app.NewBasecoinTick(Handler, store, logger.With("module", "app"), tick)
+		return start(rootDir, store, basecoinApp)
+	}
+}
+
 func startCmd(cmd *cobra.Command, args []string) error {
 	rootDir := viper.GetString(cli.HomeFlag)
 
@@ -63,9 +93,12 @@ func startCmd(cmd *cobra.Command, args []string) error {
 	if err != nil {
 		return err
 	}
-
 	// Create Basecoin app
 	basecoinApp := app.NewBasecoin(Handler, store, logger.With("module", "app"))
+	return start(rootDir, store, basecoinApp)
+}
+
+func start(rootDir string, store *app.Store, basecoinApp *app.Basecoin) error {
 
 	// if chain_id has not been set yet, load the genesis.
 	// else, assume it's been loaded
@@ -93,7 +126,7 @@ func startCmd(cmd *cobra.Command, args []string) error {
 	return startTendermint(rootDir, basecoinApp)
 }
 
-func startBasecoinABCI(basecoinApp *app.Basecoin) error {
+func startBasecoinABCI(basecoinApp abci.Application) error {
 	// Start the ABCI listener
 	addr := viper.GetString(FlagAddress)
 	svr, err := server.NewServer(addr, "socket", basecoinApp)
@@ -111,7 +144,7 @@ func startBasecoinABCI(basecoinApp *app.Basecoin) error {
 	return nil
 }
 
-func startTendermint(dir string, basecoinApp *app.Basecoin) error {
+func startTendermint(dir string, basecoinApp abci.Application) error {
 	cfg, err := tcmd.ParseConfig()
 	if err != nil {
 		return err