Add first function wrapper

waku/wrapper.py

@@ -0,0 +1,52 @@
+from cffi import FFI
+from pathlib import Path
+import json
+
+
+config = {
+    "relay": True,
+    "discv5Discovery": True,
+    "peerExchange": True,
+    "clusterId": 3,
+    "shard": 0,
+    "rlnRelay": False
+}
+config_json1 = json.dumps(config)
+ffi = FFI()
+
+_repo_root = Path(__file__).resolve().parents[1]
+lib = ffi.dlopen(str(_repo_root / "lib" / "liblogosdelivery.so"))
+
+ffi.cdef("""
+    typedef void (*FFICallBack)(int callerRet, const char *msg, size_t len, void *userData);
+
+    void *logosdelivery_create_node(
+        const char *configJson,
+        FFICallBack callback,
+        void *userData
+    );
+""")
+
+def process_callback(ret, char_p, length, callback):
+    byte_string = ffi.buffer(char_p, length)[:] if char_p != ffi.NULL and length else b""
+    callback(ret, byte_string)
+
+CallbackType = ffi.callback("void(int, const char*, size_t, void*)")
+
+def logosdelivery_create_node(config_json, callback):
+    def cb(ret, char_p, length, userData):
+        process_callback(ret, char_p, length, callback)
+
+    return lib.logosdelivery_create_node(
+        config_json.encode("utf-8"),
+        CallbackType(cb),
+        ffi.cast("void*", 0),
+    )
+
+if __name__ == "__main__":
+    def cb(ret, msg):
+        print("ret:", ret)
+        print("msg:", msg)
+
+    ctx = logosdelivery_create_node(config_json1, cb)
+    print("ctx:", ctx)