search for: pyobject_getattrstring

...ns/python/python.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/plugins/python/python.c b/plugins/python/python.c index 0206b80..35e8df2 100644 --- a/plugins/python/python.c +++ b/plugins/python/python.c @@ -94,6 +94,11 @@ callback_defined (const char *name, PyObject **obj_rtn) obj = PyObject_GetAttrString (module, name); if (!obj) return 0; + if (!PyCallable_Check (obj)) { + nbdkit_debug ("object %s isn't callable", name); + Py_DECREF (obj); + return 0; + } if (obj_rtn != NULL) *obj_rtn = obj; -- 2.14.3

...on. > > The extra glue code is (without error handling): > > PyObject *d = PyModule_GetDict(PyObject *module); > PyObject *v = PyDict_GetItemString(d, "API_VERSION"); > long api_version = PyLong_AsLong(v); Or simpler (with error handling): PyObject *v = PyObject_GetAttrString(m, "API_VERSION"); if (v == NULL) return 1; long value = PyLong_AsLong(v); Py_DECREF(m); return value; On error -1 is returned and PyErr_Occurred() will return the exception type.

...PyErr_PrintEx (0); /* print exception */\n"; + pr " };\n"; + pr "\n"; + List.iter ( + function + | CBArrayAndLen (UInt32 n, _) -> + pr " Py_DECREF (py_%s);\n" n + | CBMutable (Int n) -> + pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; + pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; + pr " Py_DECREF (py_%s_ret);\n" n; + pr " Py_DECREF (py_%s);\n" n + | CBBytesIn _ + | CBInt _ | CBInt64 _ + | CBString _ + | CBUInt _ | CB...

...eback"); +#else + module_name = PyUnicode_FromString ("traceback"); +#endif + traceback_module = PyImport_Import (module_name); + Py_DECREF (module_name); + + /* couldn't 'import traceback' */ + if (traceback_module == NULL) + return -1; + + format_exception_fn = PyObject_GetAttrString (traceback_module, + "format_exception"); + if (format_exception_fn == NULL) + return -1; + if (!PyCallable_Check (format_exception_fn)) + return -1; + + rv = PyObject_CallFunctionObjArgs (format_exception_fn, +...

...de_FromString ("traceback"); > +#endif > + traceback_module = PyImport_Import (module_name); > + Py_DECREF (module_name); > + > + /* couldn't 'import traceback' */ > + if (traceback_module == NULL) > + return -1; > + > + format_exception_fn = PyObject_GetAttrString (traceback_module, > + "format_exception"); > + if (format_exception_fn == NULL) > + return -1; > + if (!PyCallable_Check (format_exception_fn)) > + return -1; > + > + rv = PyObject_CallFunctionObjArgs (format_ex...

On 11/22/19 3:20 PM, Nir Soffer wrote: >>> +# There are several variants of the API. nbdkit will call this >>> +# function first to determine which one you want to use. This is the >>> +# latest version at the time this example was written. >>> +def api_version(): >>> + return 2 >> >> Matches the C counterpart of #define

...PyErr_PrintEx (0); /* print exception */\n"; + pr " };\n"; + pr "\n"; + List.iter ( + function + | ArrayAndLen (UInt32 n, _) -> + pr " Py_DECREF (py_%s);\n" n + | Mutable (Int n) -> + pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; + pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; + pr " Py_DECREF (py_%s_ret);\n" n; + pr " Py_DECREF (py_%s);\n" n + | BytesIn _ + | Int _ | Int64 _ + | String _ + | UInt64 _ -&gt...

...pr "\n"; List.iter ( function | CBArrayAndLen (UInt32 n, _) -> - pr " Py_DECREF (py_%s);\n" n + pr " Py_DECREF (py_%s);\n" n | CBMutable (Int n) -> - pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; - pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; - pr " Py_DECREF (py_%s_ret);\n" n; - pr " Py_DECREF (py_%s);\n" n + pr " PyObject *py_%s_ret = PyObject_GetAttrString...

Posting now that I got something to compile (at the expense of breaking OCaml bindings), but I'm open to ideas on how to improve it. Eric Blake (2): generator: Tweak print_c_arg_list to take alternate first arg RFC: generator: Handle shared callbacks in Python generator/generator | 556 ++++++++++++++++++++++---------------------- 1 file changed, 280 insertions(+), 276 deletions(-) --

.../* If the script has a dump_plugin function, call it. */ if (script && callback_defined ("dump_plugin", &fn)) { PyErr_Clear (); @@ -297,6 +305,30 @@ py_dump_plugin (void) } } +static int +get_py_api_version (void) +{ + PyObject *obj; + long value; + + obj = PyObject_GetAttrString (module, "API_VERSION"); + if (obj == NULL) + return 1; /* Default to API version 1. */ + + value = PyLong_AsLong (obj); + Py_DECREF (obj); + + if (value < 1 || value > NBDKIT_API_VERSION) { + nbdkit_error ("%s: API_VERSION requested unknown version:...

...\n"; + pr " };\n"; pr "\n"; List.iter ( function | CBArrayAndLen (UInt32 n, _) -> - pr " Py_DECREF (py_%s);\n" n + pr " Py_DECREF (py_%s);\n" n | CBMutable (Int n) -> - pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; - pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; - pr " Py_DECREF (py_%s_ret);\n" n; - pr " Py_DECREF (py_%s);\n" n + pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value...

...; pr "\n"; List.iter ( function | ArrayAndLen (UInt32 n, _) -> - pr " Py_DECREF (py_%s);\n" n + pr " Py_DECREF (py_%s);\n" n | Mutable (Int n) -> - pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; - pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; - pr " Py_DECREF (py_%s_ret);\n" n; - pr " Py_DECREF (py_%s);\n" n + pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_...

Mutable (Int n) => int *n This can currently only be used for callback arguments of type int (not for other types, nor for any ordinary function arguments), but it could be implemented more generally in future. --- generator/generator | 75 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 63 insertions(+), 12 deletions(-) diff --git a/generator/generator b/generator/generator

...pr " };\n"; - pr "\n"; - List.iter ( - function - | ArrayAndLen (UInt32 n, _) -> - pr " Py_DECREF (py_%s);\n" n - | Mutable (Int n) -> - pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; - pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; - pr " Py_DECREF (py_%s_ret);\n" n; - pr " Py_DECREF (py_%s);\n" n - | BytesIn _ - | Int _ | Int64 _ -...

v1 was here: https://www.redhat.com/archives/libguestfs/2019-July/thread.html#00231 The changes address everything that Eric picked up in his review of the first two patches. I have also added two more patches (4 and 5) which respectively fix docs and change int status -> unsigned status, as discussed. Passes make, check, check-valgrind. Rich.

Patches 1-4 are basically uncontroversial, straightforward refactoring and IMHO we should just push them. Possibly 1-3 should be squashed together, but I posted them separately so they are easier to review. Patches 5 and 6 together implement OClosure. Patch 5 adds the feature and is simple to understand. Patch 6 changes the Closure completion callbacks into OClosure, but because it doesn't

...);\n"; + pr "}\n"; + pr "\n"; + ); + List.iter ( - function - | ArrayAndLen (UInt32 n, _) -> - pr " Py_DECREF (py_%s);\n" n - | Mutable (Int n) -> - pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s, \"value\");\n" n n; - pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n; - pr " Py_DECREF (py_%s_ret);\n" n; - pr " Py_DECREF (py_%s);\n" n - | BytesIn _ - | Int _ | Int64 _ - | Opaque _ -...

...'pread', obj=<module at remote 0x7fc4abbfabd0>) at /usr/src/debug/python3.9-3.9.0~b3-1.fc33.x86_64/Objects/object.c:1278 #4 module_getattro (m=0x7fc4abbfabd0, name='pread') at /usr/src/debug/python3.9-3.9.0~b3-1.fc33.x86_64/Objects/moduleobject.c:717 #5 0x00007fc4b94c2014 in PyObject_GetAttrString (v=<module at remote 0x7fc4abbfabd0>, name=<optimized out>) at /usr/src/debug/python3.9-3.9.0~b3-1.fc33.x86_64/Objects/object.c:795 #6 0x00007fc4b9f7a5e8 in callback_defined (name=0x7fc4b9f7d4b6 "pread", obj_rtn=0x7fc4aa21e940) at python.c:77 #7 0x00007fc4b9f7b7c8 in py_prea...

As before, but this one has working Python bindings. OCaml still TBD. Rich.

This doesn't yet work. However it does make me more convinced than ever that we really need to sort out persistent buffer lifetimes in the library (similar to what we did for closures). Rich.