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librclone: free strings in python example

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albertony 2021-10-16 22:24:03 +02:00 committed by Nick Craig-Wood
parent f7764a0c9d
commit 286b152e7b
1 changed files with 17 additions and 3 deletions
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20
librclone/python/rclone.py
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@ -21,11 +21,22 @@ import json
import subprocess
from ctypes import *
class RcloneRPCString(c_char_p):
"""
This is a raw string from the C API
With a plain c_char_p type, ctypes will replace it with a
regular Python string object that cannot be used with
RcloneFreeString. Subclassing prevents it, while the string
can still be retrieved from attribute value.
"""
pass
class RcloneRPCResult(Structure):
"""
This is returned from the C API when calling RcloneRPC
"""
_fields_ = [("Output", c_char_p),
_fields_ = [("Output", RcloneRPCString),
("Status", c_int)]
class RcloneException(Exception):
@ -49,10 +60,12 @@ class Rclone():
Initialise with shared_object as the file path of librclone.so
"""
def __init__(self, shared_object="./librclone.so"):
def __init__(self, shared_object=f"./librclone{'.dll' if os.name == 'nt' else '.so'}"):
self.rclone = CDLL(shared_object)
self.rclone.RcloneRPC.restype = RcloneRPCResult
self.rclone.RcloneRPC.argtypes = (c_char_p, c_char_p)
self.rclone.RcloneFreeString.restype = None
self.rclone.RcloneFreeString.argtypes = (c_char_p,)
self.rclone.RcloneInitialize.restype = None
self.rclone.RcloneInitialize.argtypes = ()
self.rclone.RcloneFinalize.restype = None
@ -70,7 +83,8 @@ class Rclone():
method = method.encode("utf-8")
parameters = json.dumps(kwargs).encode("utf-8")
resp = self.rclone.RcloneRPC(method, parameters)
output = json.loads(resp.Output.decode("utf-8"))
output = json.loads(resp.Output.value.decode("utf-8"))
self.rclone.RcloneFreeString(resp.Output)
status = resp.Status
if status != 200:
raise RcloneException(output, status)