tendermint/example/dummy/dummy.go

package dummy

import (
	"fmt"
	"strings"

	"github.com/tendermint/abci/types"
	"github.com/tendermint/go-merkle"
)

type DummyApplication struct {
	types.BaseApplication

	state merkle.Tree
}

func NewDummyApplication() *DummyApplication {
	state := merkle.NewIAVLTree(0, nil)
	return &DummyApplication{state: state}
}

func (app *DummyApplication) Info() (resInfo types.ResponseInfo) {
	return types.ResponseInfo{Data: fmt.Sprintf("{\"size\":%v}", app.state.Size())}
}

// tx is either "key=value" or just arbitrary bytes
func (app *DummyApplication) DeliverTx(tx []byte) types.Result {
	parts := strings.Split(string(tx), "=")
	if len(parts) == 2 {
		app.state.Set([]byte(parts[0]), []byte(parts[1]))
	} else {
		app.state.Set(tx, tx)
	}
	return types.OK
}

func (app *DummyApplication) CheckTx(tx []byte) types.Result {
	return types.OK
}

func (app *DummyApplication) Commit() types.Result {
	hash := app.state.Hash()
	return types.NewResultOK(hash, "")
}

func (app *DummyApplication) Query(reqQuery types.RequestQuery) (resQuery types.ResponseQuery) {
	if reqQuery.Prove {
		value, proof, exists := app.state.Proof(reqQuery.Data)
		resQuery.Index = -1 // TODO make Proof return index
		resQuery.Key = reqQuery.Data
		resQuery.Value = value
		resQuery.Proof = proof
		if exists {
			resQuery.Log = "exists"
		} else {
			resQuery.Log = "does not exist"
		}
		return
	} else {
		index, value, exists := app.state.Get(reqQuery.Data)
		resQuery.Index = int64(index)
		resQuery.Value = value
		if exists {
			resQuery.Log = "exists"
		} else {
			resQuery.Log = "does not exist"
		}
		return
	}
}