Merge pull request #61 from tendermint/interface-fixes

Interface fixes

README.md

@@ -76,16 +76,16 @@ ABCI requests/responses are simple Protobuf messages.  Check out the [schema fil
     * `Path (string)`: Path of request, like an HTTP GET path.  Can be used with or in liue of Data.
       * Apps MUST interpret '/store' as a query by key on the underlying store.  The key SHOULD be specified in the Data field.
       * Apps SHOULD allow queries over specific types like '/accounts/...' or '/votes/...'
-    * `Height (uint64)`: The block height for which you want the query (default=0 returns data for the latest committed block)
+    * `LastHeight (uint64)`: The block height for which you want the query (default=0 returns data for the latest committed block). Note that the corresponding Merkle root hash will only be included in the header of the next block (ie. `LastHeight + 1`)
     * `Prove (bool)`: Return Merkle proof with response if possible
   * __Returns__:
     * `Code (uint32)`: Response code
     * `Key ([]byte)`: The key of the matching data
     * `Value ([]byte)`: The value of the matching data
     * `Proof ([]byte)`: Proof for the data, if requested
-    * `Height (uint64)`: The block height from which data was derived
+    * `LastHeight (uint64)`: The block height from which data was derived. The Merkle root for the proof is included in block `LastHeight + 1`
     * `Log (string)`: Debug or error message
-  *Please note* The current implementation of go-merkle doesn't support querying proofs from past blocks, so for the present moment, any height other than 0 will return an error.  Hopefully this will be improved soon(ish)
+  *Please note* The current implementation of go-merkle doesn't support querying proofs from past blocks, so for the present moment, any height other than 0 will return an error (recall height=0 defaults to latest block).  Hopefully this will be improved soon(ish)
 
 #### Info
   * __Returns__:

client/local_client.go

@@ -111,9 +111,7 @@ func (app *localClient) CommitAsync() *ReqRes {
 
 func (app *localClient) InitChainAsync(validators []*types.Validator) *ReqRes {
 	app.mtx.Lock()
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.InitChain(validators)
-	}
+	app.Application.InitChain(validators)
 	reqRes := app.callback(
 		types.ToRequestInitChain(validators),
 		types.ToResponseInitChain(),
@@ -124,9 +122,7 @@ func (app *localClient) InitChainAsync(validators []*types.Validator) *ReqRes {
 
 func (app *localClient) BeginBlockAsync(hash []byte, header *types.Header) *ReqRes {
 	app.mtx.Lock()
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.BeginBlock(hash, header)
-	}
+	app.Application.BeginBlock(hash, header)
 	app.mtx.Unlock()
 	return app.callback(
 		types.ToRequestBeginBlock(hash, header),
@@ -136,10 +132,7 @@ func (app *localClient) BeginBlockAsync(hash []byte, header *types.Header) *ReqR
 
 func (app *localClient) EndBlockAsync(height uint64) *ReqRes {
 	app.mtx.Lock()
-	var resEndBlock types.ResponseEndBlock
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		resEndBlock = bcApp.EndBlock(height)
-	}
+	resEndBlock := app.Application.EndBlock(height)
 	app.mtx.Unlock()
 	return app.callback(
 		types.ToRequestEndBlock(height),
@@ -201,27 +194,21 @@ func (app *localClient) CommitSync() (res types.Result) {
 
 func (app *localClient) InitChainSync(validators []*types.Validator) (err error) {
 	app.mtx.Lock()
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.InitChain(validators)
-	}
+	app.Application.InitChain(validators)
 	app.mtx.Unlock()
 	return nil
 }
 
 func (app *localClient) BeginBlockSync(hash []byte, header *types.Header) (err error) {
 	app.mtx.Lock()
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		bcApp.BeginBlock(hash, header)
-	}
+	app.Application.BeginBlock(hash, header)
 	app.mtx.Unlock()
 	return nil
 }
 
 func (app *localClient) EndBlockSync(height uint64) (resEndBlock types.ResponseEndBlock, err error) {
 	app.mtx.Lock()
-	if bcApp, ok := app.Application.(types.BlockchainAware); ok {
-		resEndBlock = bcApp.EndBlock(height)
-	}
+	resEndBlock = app.Application.EndBlock(height)
 	app.mtx.Unlock()
 	return resEndBlock, nil
 }

cmd/abci-cli/abci-cli.go

@@ -17,13 +17,13 @@ import (
 
 // Structure for data passed to print response.
 type response struct {
-	Data   []byte
-	Code   types.CodeType
-	Key    []byte
-	Value  []byte
-	Log    string
-	Height string
-	Proof  []byte
+	Data       []byte
+	Code       types.CodeType
+	Key        []byte
+	Value      []byte
+	Log        string
+	LastHeight string
+	Proof      []byte
 }
 
 // client is a global variable so it can be reused by the console
@@ -299,20 +299,20 @@ func cmdQuery(c *cli.Context) error {
 		return err
 	}
 	resQuery, err := client.QuerySync(types.RequestQuery{
-		Data:   queryBytes,
-		Path:   "/store", // TOOD expose
-		Height: 0,        // TODO expose
+		Data:       queryBytes,
+		Path:       "/store", // TOOD expose
+		LastHeight: 0,        // TODO expose
 		//Prove:  true,     // TODO expose
 	})
 	if err != nil {
 		return err
 	}
 	printResponse(c, response{
-		Code:   resQuery.Code,
-		Key:    resQuery.Key,
-		Value:  resQuery.Value,
-		Log:    resQuery.Log,
-		Height: fmt.Sprintf("%v", resQuery.Height),
+		Code:       resQuery.Code,
+		Key:        resQuery.Key,
+		Value:      resQuery.Value,
+		Log:        resQuery.Log,
+		LastHeight: fmt.Sprintf("%v", resQuery.LastHeight),
 		//Proof:  resQuery.Proof,
 	})
 	return nil
@@ -346,8 +346,8 @@ func printResponse(c *cli.Context, rsp response) {
 	if rsp.Log != "" {
 		fmt.Printf("-> log: %s\n", rsp.Log)
 	}
-	if rsp.Height != "" {
-		fmt.Printf("-> height: %s\n", rsp.Height)
+	if rsp.LastHeight != "" {
+		fmt.Printf("-> height: %s\n", rsp.LastHeight)
 	}
 	if rsp.Proof != nil {
 		fmt.Printf("-> proof: %X\n", rsp.Proof)

example/counter/counter.go

@@ -9,6 +9,8 @@ import (
 )
 
 type CounterApplication struct {
+	types.BaseApplication
+
 	hashCount int
 	txCount   int
 	serial    bool

example/dummy/dummy.go

@@ -9,6 +9,8 @@ import (
 )
 
 type DummyApplication struct {
+	types.BaseApplication
+
 	state merkle.Tree
 }
 
@@ -21,10 +23,6 @@ func (app *DummyApplication) Info() (resInfo types.ResponseInfo) {
 	return types.ResponseInfo{Data: fmt.Sprintf("{\"size\":%v}", app.state.Size())}
 }
 
-func (app *DummyApplication) SetOption(key string, value string) (log string) {
-	return ""
-}
-
 // tx is either "key=value" or just arbitrary bytes
 func (app *DummyApplication) DeliverTx(tx []byte) types.Result {
 	parts := strings.Split(string(tx), "=")

example/dummy/dummy_test.go

@@ -180,14 +180,13 @@ func makeApplyBlock(t *testing.T, dummy types.Application, heightInt int, diff [
 		Height: height,
 	}
 
-	dummyChain := dummy.(types.BlockchainAware) // hmm...
-	dummyChain.BeginBlock(hash, header)
+	dummy.BeginBlock(hash, header)
 	for _, tx := range txs {
 		if r := dummy.DeliverTx(tx); r.IsErr() {
 			t.Fatal(r)
 		}
 	}
-	resEndBlock := dummyChain.EndBlock(height)
+	resEndBlock := dummy.EndBlock(height)
 	dummy.Commit()
 
 	valsEqual(t, diff, resEndBlock.Diffs)

example/example_test.go

@@ -14,7 +14,6 @@ import (
 
 	"github.com/tendermint/abci/client"
 	"github.com/tendermint/abci/example/dummy"
-	nilapp "github.com/tendermint/abci/example/nil"
 	"github.com/tendermint/abci/server"
 	"github.com/tendermint/abci/types"
 	cmn "github.com/tendermint/go-common"
@@ -25,14 +24,14 @@ func TestDummy(t *testing.T) {
 	testStream(t, dummy.NewDummyApplication())
 }
 
-func TestNilApp(t *testing.T) {
-	fmt.Println("### Testing NilApp")
-	testStream(t, nilapp.NewNilApplication())
+func TestBaseApp(t *testing.T) {
+	fmt.Println("### Testing BaseApp")
+	testStream(t, types.NewBaseApplication())
 }
 
 func TestGRPC(t *testing.T) {
 	fmt.Println("### Testing GRPC")
-	testGRPCSync(t, types.NewGRPCApplication(nilapp.NewNilApplication()))
+	testGRPCSync(t, types.NewGRPCApplication(types.NewBaseApplication()))
 }
 
 func testStream(t *testing.T, app types.Application) {

example/nil/nil_app.go

@@ -1,36 +0,0 @@
-package nilapp
-
-import (
-	"github.com/tendermint/abci/types"
-)
-
-type NilApplication struct {
-}
-
-func NewNilApplication() *NilApplication {
-	return &NilApplication{}
-}
-
-func (app *NilApplication) Info() (resInfo types.ResponseInfo) {
-	return
-}
-
-func (app *NilApplication) SetOption(key string, value string) (log string) {
-	return ""
-}
-
-func (app *NilApplication) DeliverTx(tx []byte) types.Result {
-	return types.NewResultOK(nil, "")
-}
-
-func (app *NilApplication) CheckTx(tx []byte) types.Result {
-	return types.NewResultOK(nil, "")
-}
-
-func (app *NilApplication) Commit() types.Result {
-	return types.NewResultOK([]byte("nil"), "")
-}
-
-func (app *NilApplication) Query(reqQuery types.RequestQuery) (resQuery types.ResponseQuery) {
-	return resQuery
-}

server/socket_server.go

@@ -187,22 +187,14 @@ func (s *SocketServer) handleRequest(req *types.Request, responses chan<- *types
 		resQuery := s.app.Query(*r.Query)
 		responses <- types.ToResponseQuery(resQuery)
 	case *types.Request_InitChain:
-		if app, ok := s.app.(types.BlockchainAware); ok {
-			app.InitChain(r.InitChain.Validators)
-		}
+		s.app.InitChain(r.InitChain.Validators)
 		responses <- types.ToResponseInitChain()
 	case *types.Request_BeginBlock:
-		if app, ok := s.app.(types.BlockchainAware); ok {
-			app.BeginBlock(r.BeginBlock.Hash, r.BeginBlock.Header)
-		}
+		s.app.BeginBlock(r.BeginBlock.Hash, r.BeginBlock.Header)
 		responses <- types.ToResponseBeginBlock()
 	case *types.Request_EndBlock:
-		if app, ok := s.app.(types.BlockchainAware); ok {
-			resEndBlock := app.EndBlock(r.EndBlock.Height)
-			responses <- types.ToResponseEndBlock(resEndBlock)
-		} else {
-			responses <- types.ToResponseEndBlock(types.ResponseEndBlock{})
-		}
+		resEndBlock := s.app.EndBlock(r.EndBlock.Height)
+		responses <- types.ToResponseEndBlock(resEndBlock)
 	default:
 		responses <- types.ToResponseException("Unknown request")
 	}

types/application.go

@@ -6,42 +6,25 @@ import (
 
 // Applications
 type Application interface {
-
-	// Return application info
-	Info() ResponseInfo
-
-	// Set application option (e.g. mode=mempool, mode=consensus)
-	SetOption(key string, value string) (log string)
-
-	// Deliver a tx
-	DeliverTx(tx []byte) Result
-
-	// Validate a tx for the mempool
-	CheckTx(tx []byte) Result
-
-	// Query for state
-	Query(reqQuery RequestQuery) ResponseQuery
-
-	// Return the application Merkle root hash
-	Commit() Result
-}
-
-// Some applications can choose to implement BlockchainAware
-type BlockchainAware interface {
-
-	// Initialize blockchain
-	// validators: genesis validators from TendermintCore
-	InitChain(validators []*Validator)
-
-	// Signals the beginning of a block
-	BeginBlock(hash []byte, header *Header)
-
-	// Signals the end of a block
-	// diffs: changed validators from app to TendermintCore
-	EndBlock(height uint64) ResponseEndBlock
+	// Info/Query Connection
+	Info() ResponseInfo                              // Return application info
+	SetOption(key string, value string) (log string) // Set application option
+	Query(reqQuery RequestQuery) ResponseQuery       // Query for state
+
+	// Mempool Connection
+	CheckTx(tx []byte) Result // Validate a tx for the mempool
+
+	// Consensus Connection
+	InitChain(validators []*Validator)       // Initialize blockchain with validators from TendermintCore
+	BeginBlock(hash []byte, header *Header)  // Signals the beginning of a block
+	DeliverTx(tx []byte) Result              // Deliver a tx for full processing
+	EndBlock(height uint64) ResponseEndBlock // Signals the end of a block, returns changes to the validator set
+	Commit() Result                          // Commit the state and return the application Merkle root hash
 }
 
 //------------------------------------
+
+// GRPC wrapper for application
 type GRPCApplication struct {
 	app Application
 }
@@ -88,23 +71,16 @@ func (app *GRPCApplication) Commit(ctx context.Context, req *RequestCommit) (*Re
 }
 
 func (app *GRPCApplication) InitChain(ctx context.Context, req *RequestInitChain) (*ResponseInitChain, error) {
-	if chainAware, ok := app.app.(BlockchainAware); ok {
-		chainAware.InitChain(req.Validators)
-	}
-	return &ResponseInitChain{}, nil
+	app.app.InitChain(req.Validators)
+	return &ResponseInitChain{}, nil // NOTE: empty return
 }
 
 func (app *GRPCApplication) BeginBlock(ctx context.Context, req *RequestBeginBlock) (*ResponseBeginBlock, error) {
-	if chainAware, ok := app.app.(BlockchainAware); ok {
-		chainAware.BeginBlock(req.Hash, req.Header)
-	}
-	return &ResponseBeginBlock{}, nil
+	app.app.BeginBlock(req.Hash, req.Header)
+	return &ResponseBeginBlock{}, nil // NOTE: empty return
 }
 
 func (app *GRPCApplication) EndBlock(ctx context.Context, req *RequestEndBlock) (*ResponseEndBlock, error) {
-	if chainAware, ok := app.app.(BlockchainAware); ok {
-		resEndBlock := chainAware.EndBlock(req.Height)
-		return &resEndBlock, nil
-	}
-	return &ResponseEndBlock{}, nil
+	resEndBlock := app.app.EndBlock(req.Height)
+	return &resEndBlock, nil
 }

types/base_app.go

@@ -0,0 +1,42 @@
+package types
+
+type BaseApplication struct {
+}
+
+func NewBaseApplication() *BaseApplication {
+	return &BaseApplication{}
+}
+
+func (app *BaseApplication) Info() (resInfo ResponseInfo) {
+	return
+}
+
+func (app *BaseApplication) SetOption(key string, value string) (log string) {
+	return ""
+}
+
+func (app *BaseApplication) DeliverTx(tx []byte) Result {
+	return NewResultOK(nil, "")
+}
+
+func (app *BaseApplication) CheckTx(tx []byte) Result {
+	return NewResultOK(nil, "")
+}
+
+func (app *BaseApplication) Commit() Result {
+	return NewResultOK([]byte("nil"), "")
+}
+
+func (app *BaseApplication) Query(reqQuery RequestQuery) (resQuery ResponseQuery) {
+	return
+}
+
+func (app *BaseApplication) InitChain(validators []*Validator) {
+}
+
+func (app *BaseApplication) BeginBlock(hash []byte, header *Header) {
+}
+
+func (app *BaseApplication) EndBlock(height uint64) (resEndBlock ResponseEndBlock) {
+	return
+}

types/types.pb.go

@@ -716,10 +716,10 @@ func (m *RequestCheckTx) GetTx() []byte {
 }
 
 type RequestQuery struct {
-	Data   []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
-	Path   string `protobuf:"bytes,2,opt,name=path" json:"path,omitempty"`
-	Height uint64 `protobuf:"varint,3,opt,name=height" json:"height,omitempty"`
-	Prove  bool   `protobuf:"varint,4,opt,name=prove" json:"prove,omitempty"`
+	Data       []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+	Path       string `protobuf:"bytes,2,opt,name=path" json:"path,omitempty"`
+	LastHeight uint64 `protobuf:"varint,3,opt,name=last_height,json=lastHeight" json:"last_height,omitempty"`
+	Prove      bool   `protobuf:"varint,4,opt,name=prove" json:"prove,omitempty"`
 }
 
 func (m *RequestQuery) Reset()                    { *m = RequestQuery{} }
@@ -741,9 +741,9 @@ func (m *RequestQuery) GetPath() string {
 	return ""
 }
 
-func (m *RequestQuery) GetHeight() uint64 {
+func (m *RequestQuery) GetLastHeight() uint64 {
 	if m != nil {
-		return m.Height
+		return m.LastHeight
 	}
 	return 0
 }
@@ -1411,13 +1411,13 @@ func (m *ResponseCheckTx) GetLog() string {
 }
 
 type ResponseQuery struct {
-	Code   CodeType `protobuf:"varint,1,opt,name=code,enum=types.CodeType" json:"code,omitempty"`
-	Index  int64    `protobuf:"varint,2,opt,name=index" json:"index,omitempty"`
-	Key    []byte   `protobuf:"bytes,3,opt,name=key,proto3" json:"key,omitempty"`
-	Value  []byte   `protobuf:"bytes,4,opt,name=value,proto3" json:"value,omitempty"`
-	Proof  []byte   `protobuf:"bytes,5,opt,name=proof,proto3" json:"proof,omitempty"`
-	Height uint64   `protobuf:"varint,6,opt,name=height" json:"height,omitempty"`
-	Log    string   `protobuf:"bytes,7,opt,name=log" json:"log,omitempty"`
+	Code       CodeType `protobuf:"varint,1,opt,name=code,enum=types.CodeType" json:"code,omitempty"`
+	Index      int64    `protobuf:"varint,2,opt,name=index" json:"index,omitempty"`
+	Key        []byte   `protobuf:"bytes,3,opt,name=key,proto3" json:"key,omitempty"`
+	Value      []byte   `protobuf:"bytes,4,opt,name=value,proto3" json:"value,omitempty"`
+	Proof      []byte   `protobuf:"bytes,5,opt,name=proof,proto3" json:"proof,omitempty"`
+	LastHeight uint64   `protobuf:"varint,6,opt,name=last_height,json=lastHeight" json:"last_height,omitempty"`
+	Log        string   `protobuf:"bytes,7,opt,name=log" json:"log,omitempty"`
 }
 
 func (m *ResponseQuery) Reset()                    { *m = ResponseQuery{} }
@@ -1460,9 +1460,9 @@ func (m *ResponseQuery) GetProof() []byte {
 	return nil
 }
 
-func (m *ResponseQuery) GetHeight() uint64 {
+func (m *ResponseQuery) GetLastHeight() uint64 {
 	if m != nil {
-		return m.Height
+		return m.LastHeight
 	}
 	return 0
 }
@@ -2129,112 +2129,113 @@ var _ABCIApplication_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("types/types.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1711 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xac, 0x58, 0x4b, 0x6f, 0xe4, 0xc6,
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+	0x37, 0x3c, 0xf6, 0x47, 0x9b, 0x66, 0xed, 0x9b, 0x96, 0xfc, 0x1f, 0xe9, 0xc3, 0xff, 0x05, 0x00,
+	0x00, 0xff, 0xff, 0x3a, 0x61, 0xc1, 0xbf, 0x5c, 0x12, 0x00, 0x00,
 }

types/types.proto

@@ -115,7 +115,7 @@ message RequestCheckTx{
 message RequestQuery{
 	bytes data = 1;
 	string path = 2;
-	uint64 height = 3;
+	uint64 last_height = 3;
 	bool prove = 4; 
 }
 
@@ -192,11 +192,11 @@ message ResponseCheckTx{
 
 message ResponseQuery{
 	CodeType          code        = 1;
-	int64             index =       2;
+	int64             index       = 2;
 	bytes             key         = 3;
 	bytes             value       = 4;
 	bytes             proof       = 5;
-	uint64            height      = 6;
+	uint64            last_height = 6;
 	string            log         = 7;
 }