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Diffstat (limited to 'xlators/bindings/python/src/python.c')
| -rw-r--r-- | xlators/bindings/python/src/python.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/xlators/bindings/python/src/python.c b/xlators/bindings/python/src/python.c new file mode 100644 index 000000000..739ef7329 --- /dev/null +++ b/xlators/bindings/python/src/python.c @@ -0,0 +1,235 @@ +/* + Copyright (c) 2007 Chris AtLee <chris@atlee.ca> + This file is part of GlusterFS. + + GlusterFS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + GlusterFS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. +*/ + +#include <Python.h> + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + +#include "glusterfs.h" +#include "xlator.h" +#include "logging.h" +#include "defaults.h" + +typedef struct +{ + char *scriptname; + PyObject *pXlator; + PyObject *pScriptModule; + PyObject *pGlusterModule; + PyThreadState *pInterp; + + PyObject *pFrameType, *pVectorType, *pFdType; +} python_private_t; + +int32_t +python_writev (call_frame_t *frame, + xlator_t *this, + fd_t *fd, + struct iovec *vector, + int32_t count, + off_t offset) +{ + python_private_t *priv = (python_private_t *)this->private; + gf_log("python", GF_LOG_DEBUG, "In writev"); + if (PyObject_HasAttrString(priv->pXlator, "writev")) + { + + PyObject *retval = PyObject_CallMethod(priv->pXlator, "writev", + "O O O i l", + PyObject_CallMethod(priv->pFrameType, "from_address", "O&", PyLong_FromVoidPtr, frame), + PyObject_CallMethod(priv->pFdType, "from_address", "O&", PyLong_FromVoidPtr, fd), + PyObject_CallMethod(priv->pVectorType, "from_address", "O&", PyLong_FromVoidPtr, vector), + count, + offset); + if (PyErr_Occurred()) + { + PyErr_Print(); + } + Py_XDECREF(retval); + } + else + { + return default_writev(frame, this, fd, vector, count, offset); + } + return 0; +} + +struct xlator_fops fops = { + .writev = python_writev +}; + +struct xlator_mops mops = { +}; + +static PyObject * +AnonModule_FromFile (const char* fname) +{ + // Get the builtins + PyThreadState* pThread = PyThreadState_Get(); + PyObject *pBuiltins = pThread->interp->builtins; + + if (PyErr_Occurred()) + { + PyErr_Print(); + return NULL; + } + + // Create a new dictionary for running code in + PyObject *pModuleDict = PyDict_New(); + PyDict_SetItemString(pModuleDict, "__builtins__", pBuiltins); + Py_INCREF(pBuiltins); + + // Run the file in the new context + FILE* fp = fopen(fname, "r"); + PyRun_File(fp, fname, Py_file_input, pModuleDict, pModuleDict); + fclose(fp); + if (PyErr_Occurred()) + { + PyErr_Print(); + Py_DECREF(pModuleDict); + Py_DECREF(pBuiltins); + return NULL; + } + + // Create an object to hold the new context + PyRun_String("class ModuleWrapper(object):\n\tpass\n", Py_single_input, pModuleDict, pModuleDict); + if (PyErr_Occurred()) + { + PyErr_Print(); + Py_DECREF(pModuleDict); + Py_DECREF(pBuiltins); + return NULL; + } + PyObject *pModule = PyRun_String("ModuleWrapper()", Py_eval_input, pModuleDict, pModuleDict); + if (PyErr_Occurred()) + { + PyErr_Print(); + Py_DECREF(pModuleDict); + Py_DECREF(pBuiltins); + Py_XDECREF(pModule); + return NULL; + } + + // Set the new context's dictionary to the one we used to run the code + // inside + PyObject_SetAttrString(pModule, "__dict__", pModuleDict); + if (PyErr_Occurred()) + { + PyErr_Print(); + Py_DECREF(pModuleDict); + Py_DECREF(pBuiltins); + Py_DECREF(pModule); + return NULL; + } + + return pModule; +} + +int32_t +init (xlator_t *this) +{ + // This is ok to call more than once per process + Py_InitializeEx(0); + + if (!this->children) { + gf_log ("python", GF_LOG_ERROR, + "FATAL: python should have exactly one child"); + return -1; + } + + python_private_t *priv = CALLOC (sizeof (python_private_t), 1); + ERR_ABORT (priv); + + data_t *scriptname = dict_get (this->options, "scriptname"); + if (scriptname) { + priv->scriptname = data_to_str(scriptname); + } else { + gf_log("python", GF_LOG_ERROR, + "FATAL: python requires the scriptname parameter"); + return -1; + } + + priv->pInterp = Py_NewInterpreter(); + + // Adjust python's path + PyObject *syspath = PySys_GetObject("path"); + PyObject *path = PyString_FromString(GLUSTER_PYTHON_PATH); + PyList_Append(syspath, path); + Py_DECREF(path); + + gf_log("python", GF_LOG_DEBUG, + "Loading gluster module"); + + priv->pGlusterModule = PyImport_ImportModule("gluster"); + if (PyErr_Occurred()) + { + PyErr_Print(); + return -1; + } + + priv->pFrameType = PyObject_GetAttrString(priv->pGlusterModule, "call_frame_t"); + priv->pFdType = PyObject_GetAttrString(priv->pGlusterModule, "fd_t"); + priv->pVectorType = PyObject_GetAttrString(priv->pGlusterModule, "iovec"); + + gf_log("python", GF_LOG_DEBUG, "Loading script...%s", priv->scriptname); + + priv->pScriptModule = AnonModule_FromFile(priv->scriptname); + if (!priv->pScriptModule || PyErr_Occurred()) + { + gf_log("python", GF_LOG_ERROR, "Error loading %s", priv->scriptname); + PyErr_Print(); + return -1; + } + + if (!PyObject_HasAttrString(priv->pScriptModule, "xlator")) + { + gf_log("python", GF_LOG_ERROR, "%s does not have a xlator attribute", priv->scriptname); + return -1; + } + gf_log("python", GF_LOG_DEBUG, "Instantiating translator"); + priv->pXlator = PyObject_CallMethod(priv->pScriptModule, "xlator", "O&", + PyLong_FromVoidPtr, this); + if (PyErr_Occurred() || !priv->pXlator) + { + PyErr_Print(); + return -1; + } + + this->private = priv; + + gf_log ("python", GF_LOG_DEBUG, "python xlator loaded"); + return 0; +} + +void +fini (xlator_t *this) +{ + python_private_t *priv = (python_private_t*)(this->private); + Py_DECREF(priv->pXlator); + Py_DECREF(priv->pScriptModule); + Py_DECREF(priv->pGlusterModule); + Py_DECREF(priv->pFrameType); + Py_DECREF(priv->pFdType); + Py_DECREF(priv->pVectorType); + Py_EndInterpreter(priv->pInterp); + return; +} |