Make eventsdb deadlock-free

Makefile

@@ -13,10 +13,10 @@ check: check_tools ensure_deps
 ### Build
 
 build:
-	CGO_ENABLED=1 go build $(BUILD_FLAGS) -tags '$(BUILD_TAGS)' -o build/minter ./cmd/minter/
+	CGO_ENABLED=0 go build $(BUILD_FLAGS) -tags '$(BUILD_TAGS)' -o build/minter ./cmd/minter/
 
 install:
-	CGO_ENABLED=1 go install $(BUILD_FLAGS) -tags '$(BUILD_TAGS)' ./cmd/minter
+	CGO_ENABLED=0 go install $(BUILD_FLAGS) -tags '$(BUILD_TAGS)' ./cmd/minter
 
 
 ########################################

api/validators.go

@@ -73,14 +73,24 @@ func GetValidators(w http.ResponseWriter, r *http.Request) {
 	}
 
 	rState := GetStateForRequest(r)
-	vals := rState.GetStateValidators().Data()
+	vals := rState.GetStateValidators()
 
 	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
+
+	if vals == nil {
+		w.WriteHeader(http.StatusNotFound)
+		_ = json.NewEncoder(w).Encode(Response{
+			Code: 404,
+			Log:  "Validators not found",
+		})
+		return
+	}
+
 	w.WriteHeader(http.StatusOK)
 
 	var responseValidators []Validator
 
-	for _, val := range vals {
+	for _, val := range vals.Data() {
 		responseValidators = append(responseValidators, makeResponseValidator(val, rState))
 	}
 

core/minter/minter.go

@@ -268,7 +268,7 @@ func (app *Blockchain) EndBlock(req abciTypes.RequestEndBlock) abciTypes.Respons
 		}
 	}
 
-	eventsdb.GetCurrent().FlushEvents(req.Height)
+	_ = eventsdb.GetCurrent().FlushEvents(req.Height)
 
 	return abciTypes.ResponseEndBlock{
 		ValidatorUpdates: updates,