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libwaku: simpler ctx mgmt. Param now receiving void* instead of void** (#2398)

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This change is needed so that interoperability with other languages becomes simpler.
Particularly, this simplification is needed from the Python point of view,
where it is tricky to pass a void** as a parameter to an FFI function.
This commit is contained in:
Ivan FB
2024-02-07 15:24:03 +01:00
committed by GitHub
parent 34d207c4c2
commit ede67cda64
4 changed files with 113 additions and 77 deletions
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examples/python/waku.py
+73 -37
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@@ -19,8 +19,8 @@ contains the 'libwaku.so' library.
""")
exit(-1)
def handle_event(event):
print("Event received: {}".format(event))
def handle_event(ret, msg, user_data):
print("Event received: %s" % msg)
def call_waku(func):
ret = func()
@@ -55,57 +55,93 @@ json_config = "{ \
args.key,
"true" if args.relay else "false")
callback_type = ctypes.CFUNCTYPE(None, ctypes.c_char_p, ctypes.c_size_t)
callback_type = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p, ctypes.c_size_t)
# Node creation
libwaku.waku_new.restype = ctypes.c_void_p
libwaku.waku_new.argtypes = [ctypes.c_char_p,
callback_type,
ctypes.c_void_p]
ctx = libwaku.waku_new(bytes(json_config, 'utf-8'),
callback_type(
#onErrCb
lambda ret, msg, len:
print("Error calling waku_new: %s",
msg.decode('utf-8'))
),
ctypes.c_void_p(0))
# Retrieve the current version of the library
libwaku.waku_version(callback_type(lambda msg, len:
libwaku.waku_version.argtypes = [ctypes.c_void_p,
callback_type,
ctypes.c_void_p]
libwaku.waku_version(ctx,
callback_type(lambda ret, msg, len:
print("Git Version: %s" %
msg.decode('utf-8'))))
msg.decode('utf-8'))),
ctypes.c_void_p(0))
# Retrieve the default pubsub topic
default_pubsub_topic = ""
libwaku.waku_default_pubsub_topic(callback_type(
lambda msg, len: (
globals().update(default_pubsub_topic = msg.decode('utf-8')),
print("Default pubsub topic: %s" % msg.decode('utf-8')))
))
libwaku.waku_default_pubsub_topic.argtypes = [ctypes.c_void_p,
callback_type,
ctypes.c_void_p]
libwaku.waku_default_pubsub_topic(ctx,
callback_type(
lambda ret, msg, len: (
globals().update(default_pubsub_topic = msg.decode('utf-8')),
print("Default pubsub topic: %s" % msg.decode('utf-8')))
),
ctypes.c_void_p(0))
print("Bind addr: {}:{}".format(args.host, args.port))
print("Waku Relay enabled: {}".format(args.relay))
# Node creation
libwaku.waku_new.argtypes = [ctypes.c_char_p,
callback_type]
libwaku.waku_new(bytes(json_config, 'utf-8'),
callback_type(
#onErrCb
lambda msg, len:
print("Error calling waku_new: %s",
msg.decode('utf-8'))
))
# Start the node
libwaku.waku_start()
# Set the event callback
callback_type = ctypes.CFUNCTYPE(None, ctypes.c_char_p)
callback = callback_type(handle_event)
libwaku.waku_set_event_callback(callback)
callback = callback_type(handle_event) # This line is important so that the callback is not gc'ed
libwaku.waku_set_event_callback.argtypes = [callback_type, ctypes.c_void_p]
libwaku.waku_set_event_callback(callback, ctypes.c_void_p(0))
# Start the node
libwaku.waku_start.argtypes = [ctypes.c_void_p,
callback_type,
ctypes.c_void_p]
libwaku.waku_start(ctx,
callback_type(lambda ret, msg, len:
print("Error in waku_start: %s" %
msg.decode('utf-8'))),
ctypes.c_void_p(0))
# Subscribe to the default pubsub topic
libwaku.waku_relay_subscribe(default_pubsub_topic.encode('utf-8'),
callback_type(
#onErrCb
lambda msg, len:
print("Error calling waku_new: %s",
libwaku.waku_relay_subscribe.argtypes = [ctypes.c_void_p,
ctypes.c_char_p,
callback_type,
ctypes.c_void_p]
libwaku.waku_relay_subscribe(ctx,
default_pubsub_topic.encode('utf-8'),
callback_type(
#onErrCb
lambda ret, msg, len:
print("Error calling waku_relay_subscribe: %s" %
msg.decode('utf-8'))
))
),
ctypes.c_void_p(0))
libwaku.waku_connect(args.peer.encode('utf-8'),
libwaku.waku_connect.argtypes = [ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_int,
callback_type,
ctypes.c_void_p]
libwaku.waku_connect(ctx,
args.peer.encode('utf-8'),
10000,
callback_type(
# onErrCb
lambda msg, len:
print("Error calling waku_new: %s", msg.decode('utf-8'))))
callback_type(
lambda ret, msg, len:
print("Error calling waku_connect: %s" % msg.decode('utf-8'))),
ctypes.c_void_p(0))
# app = Flask(__name__)
# @app.route("/")