enable wasm filter by default

Makefile

@@ -22,16 +22,14 @@ endif
 # Build Flags
 GO_LD_FLAGS= "-s -w -X github.com/megaease/easegress/pkg/version.RELEASE=${RELEASE} -X github.com/megaease/easegress/pkg/version.COMMIT=${GIT_COMMIT} -X github.com/megaease/easegress/pkg/version.REPO=${GIT_REPO_INFO}"
 
-# Cgo is disabled by default
-ENABLE_CGO= CGO_ENABLED=0
-
-# Check Go build tags, the tags are from command line of make
-ifdef GOTAGS
-  GO_BUILD_TAGS= -tags ${GOTAGS}
-  # Must enable Cgo when wasmfilter is included
-  ifeq ($(findstring wasmfilter,${GOTAGS}), wasmfilter)
-	ENABLE_CGO= CGO_ENABLED=1
-  endif
+# Enable Wasm filter by default
+ENABLE_CGO= CGO_ENABLED=1
+GO_BUILD_TAGS=
+
+# Check if Wasm filter was disabled
+ifeq ($(findstring wasmfilter,${DISABLED_FEATURES}), wasmfilter)
+  GO_BUILD_TAGS= -tags nowasmfilter
+  ENABLE_CGO= CGO_ENABLED=0
 endif
 
 # Targets

doc/filters.md

@@ -613,16 +613,16 @@ code: /home/megaease/wasm/hello.wasm
 timeout: 200ms
 ```
 
-Note: this filter is disabled in the default build of `Easegress`, it can be enabled by:
+Note: this filter is enabled in the default build of `Easegress`, it can be disabled by:
 
 ```bash
-$ make GOTAGS=wasmfilter
+$ make DISABLED_FEATURES=wasmfilter
 ```
 
 or
 
 ```bash
-$ go build -tags=wasmfilter
+$ go build -tags=nowasmfilter
 ```
 
 ### Configuration

pkg/api/wasm.go

@@ -1,4 +1,4 @@
-// +build wasmfilter
+// +build !nowasmfilter
 
 /*
  * Copyright (c) 2017, MegaEase

pkg/filter/wasm/hostfunc.go

@@ -1,4 +1,4 @@
-// +build wasmfilter
+// +build !nowasmfilter
 
 /*
  * Copyright (c) 2017, MegaEase

pkg/filter/wasm/vm.go

@@ -1,4 +1,4 @@
-// +build wasmfilter
+// +build !nowasmfilter
 
 /*
  * Copyright (c) 2017, MegaEase

pkg/filter/wasm/wasm.go

@@ -1,4 +1,4 @@
-// +build wasmfilter
+// +build !nowasmfilter
 
 /*
  * Copyright (c) 2017, MegaEase