Commit 80721621 authored by Paul Sokolovsky's avatar Paul Sokolovsky
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extmod/modbtree: Initial implementation of "btree" module based on BerkeleyDB.

This implements basic wrapping of native get/put/seq API, and then dictionary
access protocol. Native API is intended to be superceded going forward.
parent 51805e4a
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include "py/nlr.h"
#include "py/runtime.h"
#if MICROPY_PY_BTREE
#include <db.h>
#include <../../btree/btree.h>
typedef struct _mp_obj_btree_t {
mp_obj_base_t base;
DB *db;
mp_obj_t start_key;
mp_obj_t end_key;
bool end_key_inclusive;
} mp_obj_btree_t;
STATIC const mp_obj_type_t btree_type;
#define CHECK_ERROR(res) \
if (res == RET_ERROR) { \
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errno))); \
}
void __dbpanic(DB *db) {
printf("__dbpanic(%p)\n", db);
}
STATIC mp_obj_btree_t *btree_new(DB *db) {
mp_obj_btree_t *o = m_new_obj(mp_obj_btree_t);
o->base.type = &btree_type;
o->db = db;
o->start_key = MP_OBJ_NULL;
o->end_key = MP_OBJ_NULL;
return o;
}
STATIC void btree_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_btree_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "<btree %p>", self->db);
}
STATIC mp_obj_t btree_close(mp_obj_t self_in) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(self_in);
return MP_OBJ_NEW_SMALL_INT(__bt_close(self->db));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(btree_close_obj, btree_close);
STATIC mp_obj_t btree_put(size_t n_args, const mp_obj_t *args) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(args[0]);
DBT key, val;
key.data = (void*)mp_obj_str_get_data(args[1], &key.size);
val.data = (void*)mp_obj_str_get_data(args[2], &val.size);
return MP_OBJ_NEW_SMALL_INT(__bt_put(self->db, &key, &val, 0));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(btree_put_obj, 3, 4, btree_put);
STATIC mp_obj_t btree_get(size_t n_args, const mp_obj_t *args) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(args[0]);
DBT key, val;
key.data = (void*)mp_obj_str_get_data(args[1], &key.size);
int res = __bt_get(self->db, &key, &val, 0);
if (res == RET_SPECIAL) {
return mp_const_none;
}
return mp_obj_new_bytes(val.data, val.size);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(btree_get_obj, 2, 3, btree_get);
STATIC mp_obj_t btree_seq(size_t n_args, const mp_obj_t *args) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(args[0]);
int flags = MP_OBJ_SMALL_INT_VALUE(args[1]);
DBT key, val;
if (n_args > 2) {
key.data = (void*)mp_obj_str_get_data(args[2], &key.size);
}
int res = __bt_seq(self->db, &key, &val, flags);
if (res == RET_SPECIAL) {
return mp_const_none;
}
mp_obj_tuple_t *pair = mp_obj_new_tuple(2, NULL);
pair->items[0] = mp_obj_new_bytes(key.data, key.size);
pair->items[1] = mp_obj_new_bytes(val.data, val.size);
return pair;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(btree_seq_obj, 2, 4, btree_seq);
STATIC mp_obj_t btree_range(size_t n_args, const mp_obj_t *args) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(args[0]);
self->start_key = args[1];
self->end_key = args[2];
self->end_key_inclusive = false;
return args[0];
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(btree_range_obj, 3, 4, btree_range);
STATIC mp_obj_t btree_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(self_in);
if (value == MP_OBJ_NULL) {
// delete
DBT key;
key.data = (void*)mp_obj_str_get_data(index, &key.size);
int res = __bt_delete(self->db, &key, 0);
if (res == RET_SPECIAL) {
nlr_raise(mp_obj_new_exception(&mp_type_KeyError));
}
CHECK_ERROR(res);
return mp_const_none;
} else if (value == MP_OBJ_SENTINEL) {
// load
DBT key, val;
key.data = (void*)mp_obj_str_get_data(index, &key.size);
int res = __bt_get(self->db, &key, &val, 0);
if (res == RET_SPECIAL) {
return mp_const_none;
}
CHECK_ERROR(res);
return mp_obj_new_bytes(val.data, val.size);
} else {
// store
DBT key, val;
key.data = (void*)mp_obj_str_get_data(index, &key.size);
val.data = (void*)mp_obj_str_get_data(value, &val.size);
int res = __bt_put(self->db, &key, &val, 0);
CHECK_ERROR(res);
return mp_const_none;
}
}
STATIC const mp_rom_map_elem_t btree_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&btree_close_obj) },
{ MP_ROM_QSTR(MP_QSTR_get), MP_ROM_PTR(&btree_get_obj) },
{ MP_ROM_QSTR(MP_QSTR_put), MP_ROM_PTR(&btree_put_obj) },
{ MP_ROM_QSTR(MP_QSTR_seq), MP_ROM_PTR(&btree_seq_obj) },
{ MP_ROM_QSTR(MP_QSTR_range), MP_ROM_PTR(&btree_range_obj) },
};
STATIC MP_DEFINE_CONST_DICT(btree_locals_dict, btree_locals_dict_table);
STATIC const mp_obj_type_t btree_type = {
{ &mp_type_type },
// Save on qstr's, reuse same as for module
.name = MP_QSTR_btree,
.print = btree_print,
.getiter = NULL,
.iternext = NULL,
.subscr = btree_subscr,
.locals_dict = (void*)&btree_locals_dict,
};
STATIC mp_obj_t mod_btree_open(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_server_side, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
};
const char *fname = mp_obj_str_get_str(pos_args[0]);
struct {
mp_arg_val_t server_side;
} args;
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args,
MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t*)&args);
DB *db = __bt_open(fname, /*flags*/O_CREAT | O_RDWR, /*mode*/0770, /*openinfo*/NULL, /*dflags*/0);
return MP_OBJ_FROM_PTR(btree_new(db));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_btree_open_obj, 1, mod_btree_open);
STATIC const mp_rom_map_elem_t mp_module_btree_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_btree) },
{ MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mod_btree_open_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_btree_globals, mp_module_btree_globals_table);
const mp_obj_module_t mp_module_btree = {
.base = { &mp_type_module },
.name = MP_QSTR_btree,
.globals = (mp_obj_dict_t*)&mp_module_btree_globals,
};
#endif // MICROPY_PY_BTREE
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