diff options
Diffstat (limited to 'src/python/nxt_python_wsgi.c')
| -rw-r--r-- | src/python/nxt_python_wsgi.c | 1264 |
1 files changed, 1264 insertions, 0 deletions
diff --git a/src/python/nxt_python_wsgi.c b/src/python/nxt_python_wsgi.c new file mode 100644 index 00000000..97030cd3 --- /dev/null +++ b/src/python/nxt_python_wsgi.c @@ -0,0 +1,1264 @@ + +/* + * Copyright (C) Max Romanov + * Copyright (C) Valentin V. Bartenev + * Copyright (C) NGINX, Inc. + */ + + +#include <Python.h> + +#include <nxt_main.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 <python/nxt_python.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 + */ + + +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 void nxt_python_request_handler(nxt_unit_request_info_t *req); + +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, int n, uint32_t vl); +static PyObject *nxt_python_field_name(const char *name, uint8_t len); +static PyObject *nxt_python_field_value(nxt_unit_field_t *f, int n, + uint32_t vl); +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 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 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_start_resp_obj; +static PyObject *nxt_py_write_obj; +static PyObject *nxt_py_environ_ptyp; + +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; + +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 }, + { nxt_null_string, NULL }, +}; + + +nxt_int_t +nxt_python_wsgi_init(nxt_task_t *task, nxt_unit_init_t *init) +{ + PyObject *obj; + + obj = NULL; + + if (nxt_slow_path(nxt_python_init_strings(nxt_python_strings) != NXT_OK)) { + nxt_alert(task, "Python failed to init string objects"); + goto fail; + } + + 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 = NULL; + + init->callbacks.request_handler = nxt_python_request_handler; + + return NXT_OK; + +fail: + + Py_XDECREF(obj); + + return NXT_ERROR; +} + + +int +nxt_python_wsgi_run(nxt_unit_ctx_t *ctx) +{ + int rc; + + nxt_python_thread_state = PyEval_SaveThread(); + + rc = nxt_unit_run(ctx); + + PyEval_RestoreThread(nxt_python_thread_state); + + return rc; +} + + +void +nxt_python_wsgi_done(void) +{ + nxt_python_done_strings(nxt_python_strings); + + Py_XDECREF(nxt_py_start_resp_obj); + Py_XDECREF(nxt_py_write_obj); + Py_XDECREF(nxt_py_environ_ptyp); +} + + +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 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, j, vl; + PyObject *environ; + nxt_unit_field_t *f, *f2; + 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)); + + nxt_unit_request_group_dup_fields(ctx->req); + + for (i = 0; i < r->fields_count;) { + f = r->fields + i; + vl = f->value_length; + + for (j = i + 1; j < r->fields_count; j++) { + f2 = r->fields + j; + + if (f2->hash != f->hash + || nxt_unit_sptr_get(&f2->name) != nxt_unit_sptr_get(&f->name)) + { + break; + } + + vl += 2 + f2->value_length; + } + + RC(nxt_python_add_field(ctx, f, j - i, vl)); + + i = j; + } + + 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, int n, + uint32_t vl) +{ + char *src; + PyObject *name, *value; + + src = nxt_unit_sptr_get(&field->name); + + name = nxt_python_field_name(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; + } + + value = nxt_python_field_value(field, n, vl); + + if (nxt_slow_path(value == NULL)) { + nxt_unit_req_error(ctx->req, + "Python failed to create value string \"%.*s\"", + (int) field->value_length, + (char *) nxt_unit_sptr_get(&field->value)); + 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 PyObject * +nxt_python_field_name(const char *name, uint8_t len) +{ + char *p, c; + uint8_t i; + PyObject *res; + +#if PY_MAJOR_VERSION == 3 + res = PyUnicode_New(len + 5, 255); +#else + res = PyString_FromStringAndSize(NULL, len + 5); +#endif + + if (nxt_slow_path(res == NULL)) { + return NULL; + } + + p = PyString_AS_STRING(res); + + p = nxt_cpymem(p, "HTTP_", 5); + + for (i = 0; i < len; i++) { + c = name[i]; + + if (c >= 'a' && c <= 'z') { + *p++ = (c & ~0x20); + continue; + } + + if (c == '-') { + *p++ = '_'; + continue; + } + + *p++ = c; + } + + return res; +} + + +static PyObject * +nxt_python_field_value(nxt_unit_field_t *f, int n, uint32_t vl) +{ + int i; + char *p, *src; + PyObject *res; + +#if PY_MAJOR_VERSION == 3 + res = PyUnicode_New(vl, 255); +#else + res = PyString_FromStringAndSize(NULL, vl); +#endif + + if (nxt_slow_path(res == NULL)) { + return NULL; + } + + p = PyString_AS_STRING(res); + + src = nxt_unit_sptr_get(&f->value); + p = nxt_cpymem(p, src, f->value_length); + + for (i = 1; i < n; i++) { + p = nxt_cpymem(p, ", ", 2); + + src = nxt_unit_sptr_get(&f[i].value); + p = nxt_cpymem(p, src, f[i].value_length); + } + + return res; +} + + +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 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; +} |