feat(cbindings): first commit - waku relay (#1632) (#1714)

* feat(cbindings): first commit - waku relay (#1632)

* test_app.nim: fix compilation issue. App.init(..) -> App.new(..)

* Simplifying library name (libwaku) and standardizing function names (waku_*)

* Proper wrapper of the waku_node API and creation of the libwaku.a

* Rolling back changes that are not needed

* Rolling back changes that are out of the scope of this task

* wakunode.nim: Removing unnecessary import

* Aplying PR suggestions

* Renaming 'waku.h' -> 'libwaku.h'

* Use of 'isNil' instead of '== nil'

* libwaku.nim: explicitly setting waku_poll() as gcsafe

.gitignore

@@ -53,3 +53,6 @@ nimbus-build-system.paths
 *.sqlite3
 *.sqlite3-shm
 *.sqlite3-wal
+
+# Ignore autogenerated C-bingings compilation files
+/examples/cbindings/libwaku.h

Makefile

@@ -280,24 +280,31 @@ docker-push:
 	docker push $(DOCKER_IMAGE_NAME)
 
 
-##############
-## Wrappers ##
-##############
-# TODO: Remove unused target
-libwaku.so: | build deps deps2
+################
+## C Bindings ##
+################
+.PHONY: cbindings cwaku_example libwaku.a
+
+libwaku.a: | build deps
+	echo -e $(BUILD_MSG) "build/$@" && \
+		$(ENV_SCRIPT) nim libwaku $(NIM_PARAMS) $(EXPERIMENTAL_PARAMS) waku.nims
+
+libwaku.so: | build deps
+# TODO: pending to enhance this part. Kindly use the static approach.
 	echo -e $(BUILD_MSG) "build/$@" && \
-		$(ENV_SCRIPT) nim c --app:lib --noMain --nimcache:nimcache/libwaku $(NIM_PARAMS) -o:build/$@.0 wrappers/libwaku.nim && \
-		rm -f build/$@ && \
-		ln -s $@.0 build/$@
+		$(ENV_SCRIPT) nim c --app:lib --opt:size --noMain --header -o:build/$@ library/cwakunode.nim
 
-# libraries for dynamic linking of non-Nim objects
-EXTRA_LIBS_DYNAMIC := -L"$(CURDIR)/build" -lwaku -lm
+cbindings: | build libwaku.a
 
-# TODO: Remove unused target
-wrappers: | build deps librln libwaku.so
-	echo -e $(BUILD_MSG) "build/C_wrapper_example" && \
-		 $(CC) wrappers/wrapper_example.c -Wl,-rpath,'$$ORIGIN' $(EXTRA_LIBS_DYNAMIC) -g -o build/C_wrapper_example
-	echo -e $(BUILD_MSG) "build/go_wrapper_example" && \
-		go build -ldflags "-linkmode external -extldflags '$(EXTRA_LIBS_DYNAMIC)'" -o build/go_wrapper_example wrappers/wrapper_example.go #wrappers/cfuncs.go
+cwaku_example: | build cbindings
+	echo -e $(BUILD_MSG) "build/$@" && \
+		cp nimcache/release/libwaku/libwaku.h ./examples/cbindings/ && \
+		cc -o "build/$@" \
+		./examples/cbindings/waku_example.c \
+		-lwaku -Lbuild/ -pthread -ldl -lm \
+		-lminiupnpc -Lvendor/nim-nat-traversal/vendor/miniupnp/miniupnpc/build/ \
+		-lnatpmp -Lvendor/nim-nat-traversal/vendor/libnatpmp-upstream/ \
+		vendor/nim-libbacktrace/libbacktrace_wrapper.o \
+		vendor/nim-libbacktrace/install/usr/lib/libbacktrace.a
 
 endif # "variables.mk" was not included