chore: use DBBackend global variable for default config

Makefile

@@ -4,7 +4,7 @@ OUTPUT?=build/ostracon
 BUILD_TAGS?=ostracon
 VERSION := $(shell git describe --always)
 LD_FLAGS = -X github.com/line/ostracon/version.TMCoreSemVer=$(VERSION)
-BUILD_FLAGS = -mod=readonly -ldflags "$(LD_FLAGS)"
+BUILD_FLAGS = -mod=readonly
 HTTPS_GIT := https://github.com/line/ostracon.git
 DOCKER_BUF := docker run -v $(shell pwd):/workspace --workdir /workspace bufbuild/buf
 CGO_ENABLED ?= 0
@@ -23,25 +23,29 @@ endif
 
 ifeq (,$(filter $(OSTRACON_BUILD_OPTIONS), cleveldb rocksdb boltdb badgerdb))
    BUILD_TAGS += goleveldb
+   LD_FLAGS += -X github.com/line/ostracon/types.DBBackend=goleveldb
 else
   ifeq (cleveldb,$(findstring cleveldb,$(OSTRACON_BUILD_OPTIONS)))
     CGO_ENABLED=1
     BUILD_TAGS += cleveldb
+    LD_FLAGS += -X github.com/line/ostracon/types.DBBackend=cleveldb
   endif
   ifeq (badgerdb,$(findstring badgerdb,$(OSTRACON_BUILD_OPTIONS)))
     BUILD_TAGS += badgerdb
+    LD_FLAGS += -X github.com/line/ostracon/types.DBBackend=badgerdb
   endif
   ifeq (rocksdb,$(findstring rocksdb,$(OSTRACON_BUILD_OPTIONS)))
     CGO_ENABLED=1
     BUILD_TAGS += rocksdb
+    LD_FLAGS += -X github.com/line/ostracon/types.DBBackend=rocksdb
   endif
   ifeq (boltdb,$(findstring boltdb,$(OSTRACON_BUILD_OPTIONS)))
     BUILD_TAGS += boltdb
+    LD_FLAGS += -X github.com/line/ostracon/types.DBBackend=boltdb
   endif
 endif
 
-# allow users to pass additional flags via the conventional LDFLAGS variable
-LD_FLAGS += $(LDFLAGS)
+BUILD_FLAGS += -ldflags "$(LD_FLAGS)"
 
 all: check build test install
 .PHONY: all

config/config.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"path/filepath"
 	"time"
+
+	"github.com/line/ostracon/types"
 )
 
 const (
@@ -232,7 +234,7 @@ func DefaultBaseConfig() BaseConfig {
 		LogFormat:          LogFormatPlain,
 		FastSyncMode:       true,
 		FilterPeers:        false,
-		DBBackend:          "goleveldb",
+		DBBackend:          types.DBBackend,
 		DBPath:             "data",
 	}
 }

types/utils.go

@@ -1,6 +1,19 @@
 package types
 
-import "reflect"
+import (
+	"reflect"
+)
+
+var (
+	// DBBackend is set at compile time. Could be cleveldb, defaults is goleveldb.
+	DBBackend = ""
+)
+
+func init() {
+	if len(DBBackend) == 0 {
+		DBBackend = "goleveldb"
+	}
+}
 
 // Go lacks a simple and safe way to see if something is a typed nil.
 // See: