provider: update app

app/provider/abci.go

@@ -0,0 +1,84 @@
+package app
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+
+	abci "github.com/cometbft/cometbft/abci/types"
+
+	"github.com/cosmos/cosmos-sdk/baseapp"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+type (
+	// VoteExtensionHandler defines a dummy vote extension handler for SimApp.
+	//
+	// NOTE: This implementation is solely used for testing purposes. DO NOT use
+	// in a production application!
+	VoteExtensionHandler struct{}
+
+	// VoteExtension defines the structure used to create a dummy vote extension.
+	VoteExtension struct {
+		Hash   []byte
+		Height int64
+		Data   []byte
+	}
+)
+
+func NewVoteExtensionHandler() *VoteExtensionHandler {
+	return &VoteExtensionHandler{}
+}
+
+func (h *VoteExtensionHandler) SetHandlers(bApp *baseapp.BaseApp) {
+	bApp.SetExtendVoteHandler(h.ExtendVote())
+	bApp.SetVerifyVoteExtensionHandler(h.VerifyVoteExtension())
+}
+
+func (h *VoteExtensionHandler) ExtendVote() sdk.ExtendVoteHandler {
+	return func(_ sdk.Context, req *abci.RequestExtendVote) (*abci.ResponseExtendVote, error) {
+		buf := make([]byte, 1024)
+
+		_, err := rand.Read(buf)
+		if err != nil {
+			return nil, fmt.Errorf("failed to generate random vote extension data: %w", err)
+		}
+
+		ve := VoteExtension{
+			Hash:   req.Hash,
+			Height: req.Height,
+			Data:   buf,
+		}
+
+		bz, err := json.Marshal(ve)
+		if err != nil {
+			return nil, fmt.Errorf("failed to encode vote extension: %w", err)
+		}
+
+		return &abci.ResponseExtendVote{VoteExtension: bz}, nil
+	}
+}
+
+func (h *VoteExtensionHandler) VerifyVoteExtension() sdk.VerifyVoteExtensionHandler {
+	return func(ctx sdk.Context, req *abci.RequestVerifyVoteExtension) (*abci.ResponseVerifyVoteExtension, error) {
+		var ve VoteExtension
+
+		if err := json.Unmarshal(req.VoteExtension, &ve); err != nil {
+			return &abci.ResponseVerifyVoteExtension{Status: abci.ResponseVerifyVoteExtension_REJECT}, nil
+		}
+
+		switch {
+		case req.Height != ve.Height:
+			return &abci.ResponseVerifyVoteExtension{Status: abci.ResponseVerifyVoteExtension_REJECT}, nil
+
+		case !bytes.Equal(req.Hash, ve.Hash):
+			return &abci.ResponseVerifyVoteExtension{Status: abci.ResponseVerifyVoteExtension_REJECT}, nil
+
+		case len(ve.Data) != 1024:
+			return &abci.ResponseVerifyVoteExtension{Status: abci.ResponseVerifyVoteExtension_REJECT}, nil
+		}
+
+		return &abci.ResponseVerifyVoteExtension{Status: abci.ResponseVerifyVoteExtension_ACCEPT}, nil
+	}
+}