Python: source file moved to 'python' sub-directory.

No functional changes.  Get ready for an increase in file number.

1 files changed, 0 insertions, 1446 deletions

diff --git a/src/nxt_python_wsgi.c b/src/nxt_python_wsgi.c
deleted file mode 100644
index c4b7702e..00000000
--- a/src/nxt_python_wsgi.c
+++ /dev/null
@@ -1,1446 +0,0 @@
-
-/*
- * Copyright (C) Max Romanov
- * Copyright (C) Valentin V. Bartenev
- * Copyright (C) NGINX, Inc.
- */
-
-
-#include <Python.h>
-
-#include <compile.h>
-#include <node.h>
-
-#include <nxt_main.h>
-#include <nxt_runtime.h>
-#include <nxt_router.h>
-#include <nxt_unit.h>
-#include <nxt_unit_field.h>
-#include <nxt_unit_request.h>
-#include <nxt_unit_response.h>
-
-#include NXT_PYTHON_MOUNTS_H
-
-/*
- * According to "PEP 3333 / A Note On String Types"
- * [https://www.python.org/dev/peps/pep-3333/#a-note-on-string-types]
- *
- * WSGI therefore defines two kinds of "string":
- *
- * - "Native" strings (which are always implemented using the type named str )
- *   that are used for request/response headers and metadata
- *
- *   will use PyString_* or corresponding PyUnicode_* functions
- *
- * - "Bytestrings" (which are implemented using the bytes type in Python 3, and
- *   str elsewhere), that are used for the bodies of requests and responses
- *   (e.g. POST/PUT input data and HTML page outputs).
- *
- *   will use PyString_* or corresponding PyBytes_* functions
- */
-
-
-#if PY_MAJOR_VERSION == 3
-#define NXT_PYTHON_BYTES_TYPE       "bytestring"
-
-#define PyString_FromStringAndSize(str, size)                                 \
-            PyUnicode_DecodeLatin1((str), (size), "strict")
-
-#else
-#define NXT_PYTHON_BYTES_TYPE       "string"
-
-#define PyBytes_FromStringAndSize   PyString_FromStringAndSize
-#define PyBytes_Check               PyString_Check
-#define PyBytes_GET_SIZE            PyString_GET_SIZE
-#define PyBytes_AS_STRING           PyString_AS_STRING
-#define PyUnicode_InternInPlace     PyString_InternInPlace
-#define PyUnicode_AsUTF8            PyString_AS_STRING
-#endif
-
-typedef struct nxt_python_run_ctx_s  nxt_python_run_ctx_t;
-
-typedef struct {
-    PyObject_HEAD
-} nxt_py_input_t;
-
-
-typedef struct {
-    PyObject_HEAD
-} nxt_py_error_t;
-
-static nxt_int_t nxt_python_start(nxt_task_t *task,
-    nxt_process_data_t *data);
-static nxt_int_t nxt_python_init_strings(void);
-static void nxt_python_request_handler(nxt_unit_request_info_t *req);
-static void nxt_python_atexit(void);
-
-static PyObject *nxt_python_create_environ(nxt_task_t *task);
-static PyObject *nxt_python_get_environ(nxt_python_run_ctx_t *ctx);
-static int nxt_python_add_sptr(nxt_python_run_ctx_t *ctx, PyObject *name,
-    nxt_unit_sptr_t *sptr, uint32_t size);
-static int nxt_python_add_field(nxt_python_run_ctx_t *ctx,
-    nxt_unit_field_t *field);
-static int nxt_python_add_obj(nxt_python_run_ctx_t *ctx, PyObject *name,
-    PyObject *value);
-
-static PyObject *nxt_py_start_resp(PyObject *self, PyObject *args);
-static int nxt_python_response_add_field(nxt_python_run_ctx_t *ctx,
-    PyObject *name, PyObject *value, int i);
-static int nxt_python_str_buf(PyObject *str, char **buf, uint32_t *len,
-    PyObject **bytes);
-static PyObject *nxt_py_write(PyObject *self, PyObject *args);
-
-static void nxt_py_input_dealloc(nxt_py_input_t *self);
-static PyObject *nxt_py_input_read(nxt_py_input_t *self, PyObject *args);
-static PyObject *nxt_py_input_readline(nxt_py_input_t *self, PyObject *args);
-static PyObject *nxt_py_input_getline(nxt_python_run_ctx_t *ctx, size_t size);
-static PyObject *nxt_py_input_readlines(nxt_py_input_t *self, PyObject *args);
-
-static PyObject *nxt_py_input_iter(PyObject *self);
-static PyObject *nxt_py_input_next(PyObject *self);
-
-static void nxt_python_print_exception(void);
-static int nxt_python_write(nxt_python_run_ctx_t *ctx, PyObject *bytes);
-
-struct nxt_python_run_ctx_s {
-    uint64_t                 content_length;
-    uint64_t                 bytes_sent;
-    PyObject                 *environ;
-    nxt_unit_request_info_t  *req;
-};
-
-static uint32_t  compat[] = {
-    NXT_VERNUM, NXT_DEBUG,
-};
-
-
-NXT_EXPORT nxt_app_module_t  nxt_app_module = {
-    sizeof(compat),
-    compat,
-    nxt_string("python"),
-    PY_VERSION,
-    nxt_python_mounts,
-    nxt_nitems(nxt_python_mounts),
-    NULL,
-    nxt_python_start,
-};
-
-
-static PyMethodDef nxt_py_start_resp_method[] = {
-    {"unit_start_response", nxt_py_start_resp, METH_VARARGS, ""}
-};
-
-
-static PyMethodDef nxt_py_write_method[] = {
-    {"unit_write", nxt_py_write, METH_O, ""}
-};
-
-
-static PyMethodDef nxt_py_input_methods[] = {
-    { "read",      (PyCFunction) nxt_py_input_read,      METH_VARARGS, 0 },
-    { "readline",  (PyCFunction) nxt_py_input_readline,  METH_VARARGS, 0 },
-    { "readlines", (PyCFunction) nxt_py_input_readlines, METH_VARARGS, 0 },
-    { NULL, NULL, 0, 0 }
-};
-
-
-static PyTypeObject nxt_py_input_type = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-
-    .tp_name      = "unit._input",
-    .tp_basicsize = sizeof(nxt_py_input_t),
-    .tp_dealloc   = (destructor) nxt_py_input_dealloc,
-    .tp_flags     = Py_TPFLAGS_DEFAULT,
-    .tp_doc       = "unit input object.",
-    .tp_iter      = nxt_py_input_iter,
-    .tp_iternext  = nxt_py_input_next,
-    .tp_methods   = nxt_py_input_methods,
-};
-
-
-static PyObject           *nxt_py_stderr_flush;
-static PyObject           *nxt_py_application;
-static PyObject           *nxt_py_start_resp_obj;
-static PyObject           *nxt_py_write_obj;
-static PyObject           *nxt_py_environ_ptyp;
-
-#if PY_MAJOR_VERSION == 3
-static wchar_t            *nxt_py_home;
-#else
-static char               *nxt_py_home;
-#endif
-
-static PyThreadState         *nxt_python_thread_state;
-static nxt_python_run_ctx_t  *nxt_python_run_ctx;
-
-
-static PyObject  *nxt_py_80_str;
-static PyObject  *nxt_py_close_str;
-static PyObject  *nxt_py_content_length_str;
-static PyObject  *nxt_py_content_type_str;
-static PyObject  *nxt_py_http_str;
-static PyObject  *nxt_py_https_str;
-static PyObject  *nxt_py_path_info_str;
-static PyObject  *nxt_py_query_string_str;
-static PyObject  *nxt_py_remote_addr_str;
-static PyObject  *nxt_py_request_method_str;
-static PyObject  *nxt_py_request_uri_str;
-static PyObject  *nxt_py_server_addr_str;
-static PyObject  *nxt_py_server_name_str;
-static PyObject  *nxt_py_server_port_str;
-static PyObject  *nxt_py_server_protocol_str;
-static PyObject  *nxt_py_wsgi_uri_scheme_str;
-
-typedef struct {
-    nxt_str_t  string;
-    PyObject   **object_p;
-} nxt_python_string_t;
-
-static nxt_python_string_t nxt_python_strings[] = {
-    { nxt_string("80"), &nxt_py_80_str },
-    { nxt_string("close"), &nxt_py_close_str },
-    { nxt_string("CONTENT_LENGTH"), &nxt_py_content_length_str },
-    { nxt_string("CONTENT_TYPE"), &nxt_py_content_type_str },
-    { nxt_string("http"), &nxt_py_http_str },
-    { nxt_string("https"), &nxt_py_https_str },
-    { nxt_string("PATH_INFO"), &nxt_py_path_info_str },
-    { nxt_string("QUERY_STRING"), &nxt_py_query_string_str },
-    { nxt_string("REMOTE_ADDR"), &nxt_py_remote_addr_str },
-    { nxt_string("REQUEST_METHOD"), &nxt_py_request_method_str },
-    { nxt_string("REQUEST_URI"), &nxt_py_request_uri_str },
-    { nxt_string("SERVER_ADDR"), &nxt_py_server_addr_str },
-    { nxt_string("SERVER_NAME"), &nxt_py_server_name_str },
-    { nxt_string("SERVER_PORT"), &nxt_py_server_port_str },
-    { nxt_string("SERVER_PROTOCOL"), &nxt_py_server_protocol_str },
-    { nxt_string("wsgi.url_scheme"), &nxt_py_wsgi_uri_scheme_str },
-};
-
-
-static nxt_int_t
-nxt_python_start(nxt_task_t *task, nxt_process_data_t *data)
-{
-    int                    rc;
-    char                   *nxt_py_module;
-    size_t                 len;
-    PyObject               *obj, *pypath, *module;
-    nxt_unit_ctx_t         *unit_ctx;
-    nxt_unit_init_t        python_init;
-    nxt_common_app_conf_t  *app_conf;
-    nxt_python_app_conf_t  *c;
-#if PY_MAJOR_VERSION == 3
-    char                   *path;
-    size_t                 size;
-    nxt_int_t              pep405;
-
-    static const char pyvenv[] = "/pyvenv.cfg";
-    static const char bin_python[] = "/bin/python";
-#endif
-
-    app_conf = data->app;
-    c = &app_conf->u.python;
-
-    if (c->home != NULL) {
-        len = nxt_strlen(c->home);
-
-#if PY_MAJOR_VERSION == 3
-
-        path = nxt_malloc(len + sizeof(pyvenv));
-        if (nxt_slow_path(path == NULL)) {
-            nxt_alert(task, "Failed to allocate memory");
-            return NXT_ERROR;
-        }
-
-        nxt_memcpy(path, c->home, len);
-        nxt_memcpy(path + len, pyvenv, sizeof(pyvenv));
-
-        pep405 = (access(path, R_OK) == 0);
-
-        nxt_free(path);
-
-        if (pep405) {
-            size = (len + sizeof(bin_python)) * sizeof(wchar_t);
-
-        } else {
-            size = (len + 1) * sizeof(wchar_t);
-        }
-
-        nxt_py_home = nxt_malloc(size);
-        if (nxt_slow_path(nxt_py_home == NULL)) {
-            nxt_alert(task, "Failed to allocate memory");
-            return NXT_ERROR;
-        }
-
-        if (pep405) {
-            mbstowcs(nxt_py_home, c->home, len);
-            mbstowcs(nxt_py_home + len, bin_python, sizeof(bin_python));
-            Py_SetProgramName(nxt_py_home);
-
-        } else {
-            mbstowcs(nxt_py_home, c->home, len + 1);
-            Py_SetPythonHome(nxt_py_home);
-        }
-
-#else
-        nxt_py_home = nxt_malloc(len + 1);
-        if (nxt_slow_path(nxt_py_home == NULL)) {
-            nxt_alert(task, "Failed to allocate memory");
-            return NXT_ERROR;
-        }
-
-        nxt_memcpy(nxt_py_home, c->home, len + 1);
-        Py_SetPythonHome(nxt_py_home);
-#endif
-    }
-
-    Py_InitializeEx(0);
-
-    module = NULL;
-    obj = NULL;
-
-    if (nxt_slow_path(nxt_python_init_strings() != NXT_OK)) {
-        nxt_alert(task, "Python failed to init string objects");
-        goto fail;
-    }
-
-    obj = PySys_GetObject((char *) "stderr");
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task, "Python failed to get \"sys.stderr\" object");
-        goto fail;
-    }
-
-    nxt_py_stderr_flush = PyObject_GetAttrString(obj, "flush");
-    if (nxt_slow_path(nxt_py_stderr_flush == NULL)) {
-        nxt_alert(task, "Python failed to get \"flush\" attribute of "
-                        "\"sys.stderr\" object");
-        goto fail;
-    }
-
-    Py_DECREF(obj);
-
-    if (c->path.length > 0) {
-        obj = PyString_FromStringAndSize((char *) c->path.start,
-                                         c->path.length);
-
-        if (nxt_slow_path(obj == NULL)) {
-            nxt_alert(task, "Python failed to create string object \"%V\"",
-                      &c->path);
-            goto fail;
-        }
-
-        pypath = PySys_GetObject((char *) "path");
-
-        if (nxt_slow_path(pypath == NULL)) {
-            nxt_alert(task, "Python failed to get \"sys.path\" list");
-            goto fail;
-        }
-
-        if (nxt_slow_path(PyList_Insert(pypath, 0, obj) != 0)) {
-            nxt_alert(task, "Python failed to insert \"%V\" into \"sys.path\"",
-                      &c->path);
-            goto fail;
-        }
-
-        Py_DECREF(obj);
-    }
-
-    obj = PyCFunction_New(nxt_py_start_resp_method, NULL);
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task,
-                "Python failed to initialize the \"start_response\" function");
-        goto fail;
-    }
-
-    nxt_py_start_resp_obj = obj;
-
-    obj = PyCFunction_New(nxt_py_write_method, NULL);
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task, "Python failed to initialize the \"write\" function");
-        goto fail;
-    }
-
-    nxt_py_write_obj = obj;
-
-    obj = nxt_python_create_environ(task);
-    if (nxt_slow_path(obj == NULL)) {
-        goto fail;
-    }
-
-    nxt_py_environ_ptyp = obj;
-
-    obj = Py_BuildValue("[s]", "unit");
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task, "Python failed to create the \"sys.argv\" list");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PySys_SetObject((char *) "argv", obj) != 0)) {
-        nxt_alert(task, "Python failed to set the \"sys.argv\" list");
-        goto fail;
-    }
-
-    Py_CLEAR(obj);
-
-    nxt_py_module = nxt_alloca(c->module.length + 1);
-    nxt_memcpy(nxt_py_module, c->module.start, c->module.length);
-    nxt_py_module[c->module.length] = '\0';
-
-    module = PyImport_ImportModule(nxt_py_module);
-    if (nxt_slow_path(module == NULL)) {
-        nxt_alert(task, "Python failed to import module \"%s\"", nxt_py_module);
-        nxt_python_print_exception();
-        goto fail;
-    }
-
-    obj = PyDict_GetItemString(PyModule_GetDict(module), "application");
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task, "Python failed to get \"application\" "
-                  "from module \"%s\"", nxt_py_module);
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyCallable_Check(obj) == 0)) {
-        nxt_alert(task, "\"application\" in module \"%s\" "
-                  "is not a callable object", nxt_py_module);
-        goto fail;
-    }
-
-    Py_INCREF(obj);
-    Py_CLEAR(module);
-
-    nxt_py_application = obj;
-    obj = NULL;
-
-    nxt_unit_default_init(task, &python_init);
-
-    python_init.callbacks.request_handler = nxt_python_request_handler;
-    python_init.shm_limit = data->app->shm_limit;
-
-    unit_ctx = nxt_unit_init(&python_init);
-    if (nxt_slow_path(unit_ctx == NULL)) {
-        goto fail;
-    }
-
-    nxt_python_thread_state = PyEval_SaveThread();
-
-    rc = nxt_unit_run(unit_ctx);
-
-    nxt_unit_done(unit_ctx);
-
-    PyEval_RestoreThread(nxt_python_thread_state);
-
-    nxt_python_atexit();
-
-    exit(rc);
-
-    return NXT_OK;
-
-fail:
-
-    Py_XDECREF(obj);
-    Py_XDECREF(module);
-
-    nxt_python_atexit();
-
-    return NXT_ERROR;
-}
-
-
-static nxt_int_t
-nxt_python_init_strings(void)
-{
-    PyObject             *obj;
-    nxt_uint_t           i;
-    nxt_python_string_t  *pstr;
-
-    for (i = 0; i < nxt_nitems(nxt_python_strings); i++) {
-        pstr = &nxt_python_strings[i];
-
-        obj = PyString_FromStringAndSize((char *) pstr->string.start,
-                                         pstr->string.length);
-        if (nxt_slow_path(obj == NULL)) {
-            return NXT_ERROR;
-        }
-
-        PyUnicode_InternInPlace(&obj);
-
-        *pstr->object_p = obj;
-    }
-
-    return NXT_OK;
-}
-
-
-static void
-nxt_python_request_handler(nxt_unit_request_info_t *req)
-{
-    int                   rc;
-    PyObject              *environ, *args, *response, *iterator, *item;
-    PyObject              *close, *result;
-    nxt_python_run_ctx_t  run_ctx = {-1, 0, NULL, req};
-
-    PyEval_RestoreThread(nxt_python_thread_state);
-
-    environ = nxt_python_get_environ(&run_ctx);
-    if (nxt_slow_path(environ == NULL)) {
-        rc = NXT_UNIT_ERROR;
-        goto done;
-    }
-
-    args = PyTuple_New(2);
-    if (nxt_slow_path(args == NULL)) {
-        Py_DECREF(environ);
-
-        nxt_unit_req_error(req, "Python failed to create arguments tuple");
-
-        rc = NXT_UNIT_ERROR;
-        goto done;
-    }
-
-    PyTuple_SET_ITEM(args, 0, environ);
-
-    Py_INCREF(nxt_py_start_resp_obj);
-    PyTuple_SET_ITEM(args, 1, nxt_py_start_resp_obj);
-
-    nxt_python_run_ctx = &run_ctx;
-
-    response = PyObject_CallObject(nxt_py_application, args);
-
-    Py_DECREF(args);
-
-    if (nxt_slow_path(response == NULL)) {
-        nxt_unit_req_error(req, "Python failed to call the application");
-        nxt_python_print_exception();
-
-        rc = NXT_UNIT_ERROR;
-        goto done;
-    }
-
-    /* Shortcut: avoid iterate over response string symbols. */
-    if (PyBytes_Check(response)) {
-        rc = nxt_python_write(&run_ctx, response);
-
-    } else {
-        iterator = PyObject_GetIter(response);
-
-        if (nxt_fast_path(iterator != NULL)) {
-            rc = NXT_UNIT_OK;
-
-            while (run_ctx.bytes_sent < run_ctx.content_length) {
-                item = PyIter_Next(iterator);
-
-                if (item == NULL) {
-                    if (nxt_slow_path(PyErr_Occurred() != NULL)) {
-                        nxt_unit_req_error(req, "Python failed to iterate over "
-                                           "the application response object");
-                        nxt_python_print_exception();
-
-                        rc = NXT_UNIT_ERROR;
-                    }
-
-                    break;
-                }
-
-                if (nxt_fast_path(PyBytes_Check(item))) {
-                    rc = nxt_python_write(&run_ctx, item);
-
-                } else {
-                    nxt_unit_req_error(req, "the application returned "
-                                            "not a bytestring object");
-                    rc = NXT_UNIT_ERROR;
-                }
-
-                Py_DECREF(item);
-
-                if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-                    break;
-                }
-            }
-
-            Py_DECREF(iterator);
-
-        } else {
-            nxt_unit_req_error(req,
-                            "the application returned not an iterable object");
-            nxt_python_print_exception();
-
-            rc = NXT_UNIT_ERROR;
-        }
-
-        close = PyObject_GetAttr(response, nxt_py_close_str);
-
-        if (close != NULL) {
-            result = PyObject_CallFunction(close, NULL);
-            if (nxt_slow_path(result == NULL)) {
-                nxt_unit_req_error(req, "Python failed to call the close() "
-                                        "method of the application response");
-                nxt_python_print_exception();
-
-            } else {
-                Py_DECREF(result);
-            }
-
-            Py_DECREF(close);
-
-        } else {
-            PyErr_Clear();
-        }
-    }
-
-    Py_DECREF(response);
-
-done:
-
-    nxt_python_thread_state = PyEval_SaveThread();
-
-    nxt_python_run_ctx = NULL;
-    nxt_unit_request_done(req, rc);
-}
-
-
-static void
-nxt_python_atexit(void)
-{
-    nxt_uint_t  i;
-
-    for (i = 0; i < nxt_nitems(nxt_python_strings); i++) {
-        Py_XDECREF(*nxt_python_strings[i].object_p);
-    }
-
-    Py_XDECREF(nxt_py_stderr_flush);
-    Py_XDECREF(nxt_py_application);
-    Py_XDECREF(nxt_py_start_resp_obj);
-    Py_XDECREF(nxt_py_write_obj);
-    Py_XDECREF(nxt_py_environ_ptyp);
-
-    Py_Finalize();
-
-    if (nxt_py_home != NULL) {
-        nxt_free(nxt_py_home);
-    }
-}
-
-
-static PyObject *
-nxt_python_create_environ(nxt_task_t *task)
-{
-    PyObject  *obj, *err, *environ;
-
-    environ = PyDict_New();
-
-    if (nxt_slow_path(environ == NULL)) {
-        nxt_alert(task, "Python failed to create the \"environ\" dictionary");
-        return NULL;
-    }
-
-    obj = PyString_FromStringAndSize((char *) nxt_server.start,
-                                     nxt_server.length);
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task,
-              "Python failed to create the \"SERVER_SOFTWARE\" environ value");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "SERVER_SOFTWARE", obj)
-        != 0))
-    {
-        nxt_alert(task,
-                  "Python failed to set the \"SERVER_SOFTWARE\" environ value");
-        goto fail;
-    }
-
-    Py_DECREF(obj);
-
-    obj = Py_BuildValue("(ii)", 1, 0);
-
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task,
-                  "Python failed to build the \"wsgi.version\" environ value");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.version", obj) != 0))
-    {
-        nxt_alert(task,
-                  "Python failed to set the \"wsgi.version\" environ value");
-        goto fail;
-    }
-
-    Py_DECREF(obj);
-    obj = NULL;
-
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.multithread",
-                                           Py_False)
-        != 0))
-    {
-        nxt_alert(task,
-                "Python failed to set the \"wsgi.multithread\" environ value");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.multiprocess",
-                                           Py_True)
-        != 0))
-    {
-        nxt_alert(task,
-               "Python failed to set the \"wsgi.multiprocess\" environ value");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.run_once",
-                                           Py_False)
-        != 0))
-    {
-        nxt_alert(task,
-                  "Python failed to set the \"wsgi.run_once\" environ value");
-        goto fail;
-    }
-
-
-    if (nxt_slow_path(PyType_Ready(&nxt_py_input_type) != 0)) {
-        nxt_alert(task,
-                  "Python failed to initialize the \"wsgi.input\" type object");
-        goto fail;
-    }
-
-    obj = (PyObject *) PyObject_New(nxt_py_input_t, &nxt_py_input_type);
-
-    if (nxt_slow_path(obj == NULL)) {
-        nxt_alert(task, "Python failed to create the \"wsgi.input\" object");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.input", obj) != 0)) {
-        nxt_alert(task,
-                  "Python failed to set the \"wsgi.input\" environ value");
-        goto fail;
-    }
-
-    Py_DECREF(obj);
-    obj = NULL;
-
-
-    err = PySys_GetObject((char *) "stderr");
-
-    if (nxt_slow_path(err == NULL)) {
-        nxt_alert(task, "Python failed to get \"sys.stderr\" object");
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItemString(environ, "wsgi.errors", err) != 0))
-    {
-        nxt_alert(task,
-                  "Python failed to set the \"wsgi.errors\" environ value");
-        goto fail;
-    }
-
-    return environ;
-
-fail:
-
-    Py_XDECREF(obj);
-    Py_DECREF(environ);
-
-    return NULL;
-}
-
-
-static PyObject *
-nxt_python_get_environ(nxt_python_run_ctx_t *ctx)
-{
-    int                 rc;
-    uint32_t            i;
-    PyObject            *environ;
-    nxt_unit_field_t    *f;
-    nxt_unit_request_t  *r;
-
-    environ = PyDict_Copy(nxt_py_environ_ptyp);
-    if (nxt_slow_path(environ == NULL)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to copy the \"environ\" dictionary");
-
-        return NULL;
-    }
-
-    ctx->environ = environ;
-
-    r = ctx->req->request;
-
-#define RC(S)                                                                 \
-    do {                                                                      \
-        rc = (S);                                                             \
-        if (nxt_slow_path(rc != NXT_UNIT_OK)) {                               \
-            goto fail;                                                        \
-        }                                                                     \
-    } while(0)
-
-    RC(nxt_python_add_sptr(ctx, nxt_py_request_method_str, &r->method,
-                           r->method_length));
-    RC(nxt_python_add_sptr(ctx, nxt_py_request_uri_str, &r->target,
-                           r->target_length));
-    RC(nxt_python_add_sptr(ctx, nxt_py_query_string_str, &r->query,
-                           r->query_length));
-    RC(nxt_python_add_sptr(ctx, nxt_py_path_info_str, &r->path,
-                           r->path_length));
-
-    RC(nxt_python_add_sptr(ctx, nxt_py_remote_addr_str, &r->remote,
-                           r->remote_length));
-    RC(nxt_python_add_sptr(ctx, nxt_py_server_addr_str, &r->local,
-                           r->local_length));
-
-    if (r->tls) {
-        RC(nxt_python_add_obj(ctx, nxt_py_wsgi_uri_scheme_str,
-                              nxt_py_https_str));
-    } else {
-        RC(nxt_python_add_obj(ctx, nxt_py_wsgi_uri_scheme_str,
-                              nxt_py_http_str));
-    }
-
-    RC(nxt_python_add_sptr(ctx, nxt_py_server_protocol_str, &r->version,
-                           r->version_length));
-
-    RC(nxt_python_add_sptr(ctx, nxt_py_server_name_str, &r->server_name,
-                           r->server_name_length));
-    RC(nxt_python_add_obj(ctx, nxt_py_server_port_str, nxt_py_80_str));
-
-    for (i = 0; i < r->fields_count; i++) {
-        f = r->fields + i;
-
-        RC(nxt_python_add_field(ctx, f));
-    }
-
-    if (r->content_length_field != NXT_UNIT_NONE_FIELD) {
-        f = r->fields + r->content_length_field;
-
-        RC(nxt_python_add_sptr(ctx, nxt_py_content_length_str, &f->value,
-                               f->value_length));
-    }
-
-    if (r->content_type_field != NXT_UNIT_NONE_FIELD) {
-        f = r->fields + r->content_type_field;
-
-        RC(nxt_python_add_sptr(ctx, nxt_py_content_type_str, &f->value,
-                               f->value_length));
-    }
-
-#undef RC
-
-    return environ;
-
-fail:
-
-    Py_DECREF(environ);
-
-    return NULL;
-}
-
-
-static int
-nxt_python_add_sptr(nxt_python_run_ctx_t *ctx, PyObject *name,
-    nxt_unit_sptr_t *sptr, uint32_t size)
-{
-    char      *src;
-    PyObject  *value;
-
-    src = nxt_unit_sptr_get(sptr);
-
-    value = PyString_FromStringAndSize(src, size);
-    if (nxt_slow_path(value == NULL)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to create value string \"%.*s\"",
-                           (int) size, src);
-        nxt_python_print_exception();
-
-        return NXT_UNIT_ERROR;
-    }
-
-    if (nxt_slow_path(PyDict_SetItem(ctx->environ, name, value) != 0)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to set the \"%s\" environ value",
-                           PyUnicode_AsUTF8(name));
-        Py_DECREF(value);
-
-        return NXT_UNIT_ERROR;
-    }
-
-    Py_DECREF(value);
-
-    return NXT_UNIT_OK;
-}
-
-
-static int
-nxt_python_add_field(nxt_python_run_ctx_t *ctx, nxt_unit_field_t *field)
-{
-    char      *src;
-    PyObject  *name, *value;
-
-    src = nxt_unit_sptr_get(&field->name);
-
-    name = PyString_FromStringAndSize(src, field->name_length);
-    if (nxt_slow_path(name == NULL)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to create name string \"%.*s\"",
-                           (int) field->name_length, src);
-        nxt_python_print_exception();
-
-        return NXT_UNIT_ERROR;
-    }
-
-    src = nxt_unit_sptr_get(&field->value);
-
-    value = PyString_FromStringAndSize(src, field->value_length);
-    if (nxt_slow_path(value == NULL)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to create value string \"%.*s\"",
-                           (int) field->value_length, src);
-        nxt_python_print_exception();
-
-        goto fail;
-    }
-
-    if (nxt_slow_path(PyDict_SetItem(ctx->environ, name, value) != 0)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to set the \"%s\" environ value",
-                           PyUnicode_AsUTF8(name));
-        goto fail;
-    }
-
-    Py_DECREF(name);
-    Py_DECREF(value);
-
-    return NXT_UNIT_OK;
-
-fail:
-
-    Py_DECREF(name);
-    Py_XDECREF(value);
-
-    return NXT_UNIT_ERROR;
-}
-
-
-static int
-nxt_python_add_obj(nxt_python_run_ctx_t *ctx, PyObject *name, PyObject *value)
-{
-    if (nxt_slow_path(PyDict_SetItem(ctx->environ, name, value) != 0)) {
-        nxt_unit_req_error(ctx->req,
-                           "Python failed to set the \"%s\" environ value",
-                           PyUnicode_AsUTF8(name));
-
-        return NXT_UNIT_ERROR;
-    }
-
-    return NXT_UNIT_OK;
-}
-
-
-static PyObject *
-nxt_py_start_resp(PyObject *self, PyObject *args)
-{
-    int                   rc, status;
-    char                  *status_str, *space_ptr;
-    uint32_t              status_len;
-    PyObject              *headers, *tuple, *string, *status_bytes;
-    Py_ssize_t            i, n, fields_size, fields_count;
-    nxt_python_run_ctx_t  *ctx;
-
-    ctx = nxt_python_run_ctx;
-    if (nxt_slow_path(ctx == NULL)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "start_response() is called "
-                            "outside of WSGI request processing");
-    }
-
-    n = PyTuple_GET_SIZE(args);
-
-    if (n < 2 || n > 3) {
-        return PyErr_Format(PyExc_TypeError, "invalid number of arguments");
-    }
-
-    string = PyTuple_GET_ITEM(args, 0);
-    if (!PyBytes_Check(string) && !PyUnicode_Check(string)) {
-        return PyErr_Format(PyExc_TypeError,
-                            "failed to write first argument (not a string?)");
-    }
-
-    headers = PyTuple_GET_ITEM(args, 1);
-    if (!PyList_Check(headers)) {
-        return PyErr_Format(PyExc_TypeError,
-                         "the second argument is not a response headers list");
-    }
-
-    fields_size = 0;
-    fields_count = PyList_GET_SIZE(headers);
-
-    for (i = 0; i < fields_count; i++) {
-        tuple = PyList_GET_ITEM(headers, i);
-
-        if (!PyTuple_Check(tuple)) {
-            return PyErr_Format(PyExc_TypeError,
-                              "the response headers must be a list of tuples");
-        }
-
-        if (PyTuple_GET_SIZE(tuple) != 2) {
-            return PyErr_Format(PyExc_TypeError,
-                                "each header must be a tuple of two items");
-        }
-
-        string = PyTuple_GET_ITEM(tuple, 0);
-        if (PyBytes_Check(string)) {
-            fields_size += PyBytes_GET_SIZE(string);
-
-        } else if (PyUnicode_Check(string)) {
-            fields_size += PyUnicode_GET_SIZE(string);
-
-        } else {
-            return PyErr_Format(PyExc_TypeError,
-                                "header #%d name is not a string", (int) i);
-        }
-
-        string = PyTuple_GET_ITEM(tuple, 1);
-        if (PyBytes_Check(string)) {
-            fields_size += PyBytes_GET_SIZE(string);
-
-        } else if (PyUnicode_Check(string)) {
-            fields_size += PyUnicode_GET_SIZE(string);
-
-        } else {
-            return PyErr_Format(PyExc_TypeError,
-                                "header #%d value is not a string", (int) i);
-        }
-    }
-
-    ctx->content_length = -1;
-
-    string = PyTuple_GET_ITEM(args, 0);
-    rc = nxt_python_str_buf(string, &status_str, &status_len, &status_bytes);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        return PyErr_Format(PyExc_TypeError, "status is not a string");
-    }
-
-    space_ptr = memchr(status_str, ' ', status_len);
-    if (space_ptr != NULL) {
-        status_len = space_ptr - status_str;
-    }
-
-    status = nxt_int_parse((u_char *) status_str, status_len);
-    if (nxt_slow_path(status < 0)) {
-        return PyErr_Format(PyExc_TypeError, "failed to parse status code");
-    }
-
-    Py_XDECREF(status_bytes);
-
-    /*
-     * PEP 3333:
-     *
-     * ... applications can replace their originally intended output with error
-     * output, up until the last possible moment.
-     */
-    rc = nxt_unit_response_init(ctx->req, status, fields_count, fields_size);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "failed to allocate response object");
-    }
-
-    for (i = 0; i < fields_count; i++) {
-        tuple = PyList_GET_ITEM(headers, i);
-
-        rc = nxt_python_response_add_field(ctx, PyTuple_GET_ITEM(tuple, 0),
-                                           PyTuple_GET_ITEM(tuple, 1), i);
-        if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-            return PyErr_Format(PyExc_RuntimeError,
-                                "failed to add header #%d", (int) i);
-        }
-    }
-
-    /*
-     * PEP 3333:
-     *
-     * However, the start_response callable must not actually transmit the
-     * response headers. Instead, it must store them for the server or gateway
-     * to transmit only after the first iteration of the application return
-     * value that yields a non-empty bytestring, or upon the application's
-     * first invocation of the write() callable. In other words, response
-     * headers must not be sent until there is actual body data available, or
-     * until the application's returned iterable is exhausted. (The only
-     * possible exception to this rule is if the response headers explicitly
-     * include a Content-Length of zero.)
-     */
-    if (ctx->content_length == 0) {
-        rc = nxt_unit_response_send(ctx->req);
-        if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-            return PyErr_Format(PyExc_RuntimeError,
-                                "failed to send response headers");
-        }
-    }
-
-    Py_INCREF(nxt_py_write_obj);
-    return nxt_py_write_obj;
-}
-
-
-static int
-nxt_python_response_add_field(nxt_python_run_ctx_t *ctx, PyObject *name,
-    PyObject *value, int i)
-{
-    int        rc;
-    char       *name_str, *value_str;
-    uint32_t   name_length, value_length;
-    PyObject   *name_bytes, *value_bytes;
-    nxt_off_t  content_length;
-
-    name_bytes = NULL;
-    value_bytes = NULL;
-
-    rc = nxt_python_str_buf(name, &name_str, &name_length, &name_bytes);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        goto fail;
-    }
-
-    rc = nxt_python_str_buf(value, &value_str, &value_length, &value_bytes);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        goto fail;
-    }
-
-    rc = nxt_unit_response_add_field(ctx->req, name_str, name_length,
-                                     value_str, value_length);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        goto fail;
-    }
-
-    if (ctx->req->response->fields[i].hash == NXT_UNIT_HASH_CONTENT_LENGTH) {
-        content_length = nxt_off_t_parse((u_char *) value_str, value_length);
-        if (nxt_slow_path(content_length < 0)) {
-            nxt_unit_req_error(ctx->req, "failed to parse Content-Length "
-                               "value %.*s", (int) value_length, value_str);
-
-        } else {
-            ctx->content_length = content_length;
-        }
-    }
-
-fail:
-
-    Py_XDECREF(name_bytes);
-    Py_XDECREF(value_bytes);
-
-    return rc;
-}
-
-
-static int
-nxt_python_str_buf(PyObject *str, char **buf, uint32_t *len, PyObject **bytes)
-{
-    if (PyBytes_Check(str)) {
-        *buf = PyBytes_AS_STRING(str);
-        *len = PyBytes_GET_SIZE(str);
-        *bytes = NULL;
-
-    } else {
-        *bytes = PyUnicode_AsLatin1String(str);
-        if (nxt_slow_path(*bytes == NULL)) {
-            return NXT_UNIT_ERROR;
-        }
-
-        *buf = PyBytes_AS_STRING(*bytes);
-        *len = PyBytes_GET_SIZE(*bytes);
-    }
-
-    return NXT_UNIT_OK;
-}
-
-
-static PyObject *
-nxt_py_write(PyObject *self, PyObject *str)
-{
-    int  rc;
-
-    if (nxt_fast_path(!PyBytes_Check(str))) {
-        return PyErr_Format(PyExc_TypeError, "the argument is not a %s",
-                            NXT_PYTHON_BYTES_TYPE);
-    }
-
-    rc = nxt_python_write(nxt_python_run_ctx, str);
-    if (nxt_slow_path(rc != NXT_UNIT_OK)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "failed to write response value");
-    }
-
-    Py_RETURN_NONE;
-}
-
-
-static void
-nxt_py_input_dealloc(nxt_py_input_t *self)
-{
-    PyObject_Del(self);
-}
-
-
-static PyObject *
-nxt_py_input_read(nxt_py_input_t *self, PyObject *args)
-{
-    char                  *buf;
-    PyObject              *content, *obj;
-    Py_ssize_t            size, n;
-    nxt_python_run_ctx_t  *ctx;
-
-    ctx = nxt_python_run_ctx;
-    if (nxt_slow_path(ctx == NULL)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "wsgi.input.read() is called "
-                            "outside of WSGI request processing");
-    }
-
-    size = ctx->req->content_length;
-
-    n = PyTuple_GET_SIZE(args);
-
-    if (n > 0) {
-        if (n != 1) {
-            return PyErr_Format(PyExc_TypeError, "invalid number of arguments");
-        }
-
-        obj = PyTuple_GET_ITEM(args, 0);
-
-        size = PyNumber_AsSsize_t(obj, PyExc_OverflowError);
-
-        if (nxt_slow_path(size < 0)) {
-            if (size == -1 && PyErr_Occurred()) {
-                return NULL;
-            }
-
-            if (size != -1) {
-                return PyErr_Format(PyExc_ValueError,
-                                  "the read body size cannot be zero or less");
-            }
-        }
-
-        if (size == -1 || size > (Py_ssize_t) ctx->req->content_length) {
-            size = ctx->req->content_length;
-        }
-    }
-
-    content = PyBytes_FromStringAndSize(NULL, size);
-    if (nxt_slow_path(content == NULL)) {
-        return NULL;
-    }
-
-    buf = PyBytes_AS_STRING(content);
-
-    size = nxt_unit_request_read(ctx->req, buf, size);
-
-    return content;
-}
-
-
-static PyObject *
-nxt_py_input_readline(nxt_py_input_t *self, PyObject *args)
-{
-    ssize_t               ssize;
-    PyObject              *obj;
-    Py_ssize_t            n;
-    nxt_python_run_ctx_t  *ctx;
-
-    ctx = nxt_python_run_ctx;
-    if (nxt_slow_path(ctx == NULL)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "wsgi.input.readline() is called "
-                            "outside of WSGI request processing");
-    }
-
-    n = PyTuple_GET_SIZE(args);
-
-    if (n > 0) {
-        if (n != 1) {
-            return PyErr_Format(PyExc_TypeError, "invalid number of arguments");
-        }
-
-        obj = PyTuple_GET_ITEM(args, 0);
-
-        ssize = PyNumber_AsSsize_t(obj, PyExc_OverflowError);
-
-        if (nxt_fast_path(ssize > 0)) {
-            return nxt_py_input_getline(ctx, ssize);
-        }
-
-        if (ssize == 0) {
-            return PyBytes_FromStringAndSize("", 0);
-        }
-
-        if (ssize != -1) {
-            return PyErr_Format(PyExc_ValueError,
-                                "the read line size cannot be zero or less");
-        }
-
-        if (PyErr_Occurred()) {
-            return NULL;
-        }
-    }
-
-    return nxt_py_input_getline(ctx, SSIZE_MAX);
-}
-
-
-static PyObject *
-nxt_py_input_getline(nxt_python_run_ctx_t *ctx, size_t size)
-{
-    void      *buf;
-    ssize_t   res;
-    PyObject  *content;
-
-    res = nxt_unit_request_readline_size(ctx->req, size);
-    if (nxt_slow_path(res < 0)) {
-        return NULL;
-    }
-
-    if (res == 0) {
-        return PyBytes_FromStringAndSize("", 0);
-    }
-
-    content = PyBytes_FromStringAndSize(NULL, res);
-    if (nxt_slow_path(content == NULL)) {
-        return NULL;
-    }
-
-    buf = PyBytes_AS_STRING(content);
-
-    res = nxt_unit_request_read(ctx->req, buf, res);
-
-    return content;
-}
-
-
-static PyObject *
-nxt_py_input_readlines(nxt_py_input_t *self, PyObject *args)
-{
-    PyObject              *res;
-    nxt_python_run_ctx_t  *ctx;
-
-    ctx = nxt_python_run_ctx;
-    if (nxt_slow_path(ctx == NULL)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "wsgi.input.readlines() is called "
-                            "outside of WSGI request processing");
-    }
-
-    res = PyList_New(0);
-    if (nxt_slow_path(res == NULL)) {
-        return NULL;
-    }
-
-    for ( ;; ) {
-        PyObject *line = nxt_py_input_getline(ctx, SSIZE_MAX);
-        if (nxt_slow_path(line == NULL)) {
-            Py_DECREF(res);
-            return NULL;
-        }
-
-        if (PyBytes_GET_SIZE(line) == 0) {
-            Py_DECREF(line);
-            return res;
-        }
-
-        PyList_Append(res, line);	
-        Py_DECREF(line);
-    }
-
-    return res;
-}
-
-
-static PyObject *
-nxt_py_input_iter(PyObject *self)
-{
-    Py_INCREF(self);
-    return self;
-}
-
-
-static PyObject *
-nxt_py_input_next(PyObject *self)
-{
-    PyObject              *line;
-    nxt_python_run_ctx_t  *ctx;
-
-    ctx = nxt_python_run_ctx;
-    if (nxt_slow_path(ctx == NULL)) {
-        return PyErr_Format(PyExc_RuntimeError,
-                            "wsgi.input.next() is called "
-                            "outside of WSGI request processing");
-    }
-
-    line = nxt_py_input_getline(ctx, SSIZE_MAX);
-    if (nxt_slow_path(line == NULL)) {
-        return NULL;
-    }
-
-    if (PyBytes_GET_SIZE(line) == 0) {
-        Py_DECREF(line);
-        PyErr_SetNone(PyExc_StopIteration);
-        return NULL;
-    }
-
-    return line;
-}
-
-
-static void
-nxt_python_print_exception(void)
-{
-    PyErr_Print();
-
-#if PY_MAJOR_VERSION == 3
-    /* The backtrace may be buffered in sys.stderr file object. */
-    {
-        PyObject  *result;
-
-        result = PyObject_CallFunction(nxt_py_stderr_flush, NULL);
-        if (nxt_slow_path(result == NULL)) {
-            PyErr_Clear();
-            return;
-        }
-
-        Py_DECREF(result);
-    }
-#endif
-}
-
-
-static int
-nxt_python_write(nxt_python_run_ctx_t *ctx, PyObject *bytes)
-{
-    int       rc;
-    char      *str_buf;
-    uint32_t  str_length;
-
-    str_buf = PyBytes_AS_STRING(bytes);
-    str_length = PyBytes_GET_SIZE(bytes);
-
-    if (nxt_slow_path(str_length == 0)) {
-        return NXT_UNIT_OK;
-    }
-
-    /*
-     * PEP 3333:
-     *
-     * If the application supplies a Content-Length header, the server should
-     * not transmit more bytes to the client than the header allows, and should
-     * stop iterating over the response when enough data has been sent, or raise
-     * an error if the application tries to write() past that point.
-     */
-    if (nxt_slow_path(str_length > ctx->content_length - ctx->bytes_sent)) {
-        nxt_unit_req_error(ctx->req, "content length %"PRIu64" exceeded",
-                           ctx->content_length);
-
-        return NXT_UNIT_ERROR;
-    }
-
-    rc = nxt_unit_response_write(ctx->req, str_buf, str_length);
-    if (nxt_fast_path(rc == NXT_UNIT_OK)) {
-        ctx->bytes_sent += str_length;
-    }
-
-    return rc;
-}