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TDBStore.h
1 /*
2  * Copyright (c) 2018 ARM Limited. All rights reserved.
3  * SPDX-License-Identifier: Apache-2.0
4  * Licensed under the Apache License, Version 2.0 (the License); you may
5  * not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef MBED_TDBSTORE_H
18 #define MBED_TDBSTORE_H
19 
20 #include <stdint.h>
21 #include <stdio.h>
22 #include "kvstore/KVStore.h"
23 #include "blockdevice/BlockDevice.h"
24 #include "blockdevice/BufferedBlockDevice.h"
25 #include "PlatformMutex.h"
26 #include "mbed_error.h"
27 
28 namespace mbed {
29 
30 /** TDBStore class
31  *
32  * Lightweight Key Value storage over a block device
33  */
34 
35 class TDBStore : public KVStore {
36 public:
37 
38  static const uint32_t RESERVED_AREA_SIZE = 64;
39 
40  /**
41  * @brief Class constructor
42  *
43  * @param[in] bd Underlying block device. The BlockDevice
44  * can be any BlockDevice with flash characteristics.
45  * If using a BlockDevice without flash, such as SDBlockDevice,
46  * please add the FlashSimBlockDevice on top of it.
47  *
48  * @returns none
49  */
50  TDBStore(BlockDevice *bd);
51 
52  /**
53  * @brief Class destructor
54  *
55  * @returns none
56  */
57  virtual ~TDBStore();
58 
59  /**
60  * @brief Initialize TDBStore. If data exists, TDBStore will check the data integrity
61  * on initialize. If the integrity checks fails, the TDBStore will use GC to collect
62  * the available data and clean corrupted and erroneous records.
63  *
64  * @returns MBED_SUCCESS Success.
65  * @returns Negative error code on failure.
66  */
67  virtual int init();
68 
69  /**
70  * @brief Deinitialize TDBStore, release and free resources.
71  *
72  * @returns MBED_SUCCESS Success.
73  */
74  virtual int deinit();
75 
76 
77  /**
78  * @brief Reset TDBStore contents (clear all keys) and reserved data
79  *
80  * @returns MBED_SUCCESS Success.
81  * MBED_ERROR_NOT_READY Not initialized.
82  * MBED_ERROR_READ_FAILED Unable to read from media.
83  * MBED_ERROR_WRITE_FAILED Unable to write to media.
84  */
85  virtual int reset();
86 
87  /**
88  * @brief Set one TDBStore item, given key and value.
89  *
90  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
91  * @param[in] buffer Value data buffer.
92  * @param[in] size Value data size.
93  * @param[in] create_flags Flag mask.
94  *
95  * @returns MBED_SUCCESS Success.
96  * MBED_ERROR_NOT_READY Not initialized.
97  * MBED_ERROR_READ_FAILED Unable to read from media.
98  * MBED_ERROR_WRITE_FAILED Unable to write to media.
99  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
100  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
101  * MBED_ERROR_MEDIA_FULL Not enough room on media.
102  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
103  */
104  virtual int set(const char *key, const void *buffer, size_t size, uint32_t create_flags);
105 
106  /**
107  * @brief Get one TDBStore item by given key.
108  *
109  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
110  * @param[in] buffer Value data buffer.
111  * @param[in] buffer_size Value data buffer size.
112  * @param[out] actual_size Actual read size.
113  * @param[in] offset Offset to read from in data.
114  *
115  * @returns MBED_SUCCESS Success.
116  * MBED_ERROR_NOT_READY Not initialized.
117  * MBED_ERROR_READ_FAILED Unable to read from media.
118  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
119  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
120  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
121  * MBED_ERROR_ITEM_NOT_FOUND No such key.
122  */
123  virtual int get(const char *key, void *buffer, size_t buffer_size, size_t *actual_size = NULL,
124  size_t offset = 0);
125 
126  /**
127  * @brief Get information of a given key. The returned info contains size and flags
128  *
129  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
130  * @param[out] info Returned information structure.
131  *
132  * @returns MBED_SUCCESS Success.
133  * MBED_ERROR_NOT_READY Not initialized.
134  * MBED_ERROR_READ_FAILED Unable to read from media.
135  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
136  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
137  * MBED_ERROR_ITEM_NOT_FOUND No such key.
138  */
139  virtual int get_info(const char *key, info_t *info);
140 
141  /**
142  * @brief Remove a TDBStore item by given key.
143  *
144  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
145  *
146  * @returns MBED_SUCCESS Success.
147  * MBED_ERROR_NOT_READY Not initialized.
148  * MBED_ERROR_READ_FAILED Unable to read from media.
149  * MBED_ERROR_WRITE_FAILED Unable to write to media.
150  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
151  * MBED_ERROR_MEDIA_FULL Not enough room on media.
152  * MBED_ERROR_ITEM_NOT_FOUND No such key.
153  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
154  */
155  virtual int remove(const char *key);
156 
157 
158  /**
159  * @brief Start an incremental TDBStore set sequence. This operation is blocking other operations.
160  * Any get/set/remove/iterator operation will be blocked until set_finalize is called.
161  *
162  * @param[out] handle Returned incremental set handle.
163  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
164  * @param[in] final_data_size Final value data size.
165  * @param[in] create_flags Flag mask.
166  *
167  * @returns MBED_SUCCESS Success.
168  * MBED_ERROR_NOT_READY Not initialized.
169  * MBED_ERROR_READ_FAILED Unable to read from media.
170  * MBED_ERROR_WRITE_FAILED Unable to write to media.
171  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
172  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
173  * MBED_ERROR_MEDIA_FULL Not enough room on media.
174  * MBED_ERROR_WRITE_PROTECTED Already stored with "write once" flag.
175  */
176  virtual int set_start(set_handle_t *handle, const char *key, size_t final_data_size, uint32_t create_flags);
177 
178  /**
179  * @brief Add data to incremental TDBStore set sequence. This operation is blocking other operations.
180  * Any get/set/remove operation will be blocked until set_finalize will be called.
181  *
182  * @param[in] handle Incremental set handle.
183  * @param[in] value_data Value data to add.
184  * @param[in] data_size Value data size.
185  *
186  * @returns MBED_SUCCESS Success.
187  * MBED_ERROR_NOT_READY Not initialized.
188  * MBED_ERROR_WRITE_FAILED Unable to write to media.
189  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
190  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
191  */
192  virtual int set_add_data(set_handle_t handle, const void *value_data, size_t data_size);
193 
194  /**
195  * @brief Finalize an incremental KVStore set sequence.
196  *
197  * @param[in] handle Incremental set handle.
198  *
199  * @returns MBED_SUCCESS Success.
200  * MBED_ERROR_NOT_READY Not initialized.
201  * MBED_ERROR_WRITE_FAILED Unable to write to media.
202  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
203  */
204  virtual int set_finalize(set_handle_t handle);
205 
206  /**
207  * @brief Start an iteration over KVStore keys.
208  * There are no issues with any other operations while iterator is open.
209  *
210  * @param[out] it Returned iterator handle.
211  * @param[in] prefix Key prefix (null for all keys).
212  *
213  * @returns MBED_SUCCESS Success.
214  * MBED_ERROR_NOT_READY Not initialized.
215  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
216  */
217  virtual int iterator_open(iterator_t *it, const char *prefix = NULL);
218 
219  /**
220  * @brief Get next key in iteration.
221  * There are no issues with any other operations while iterator is open.
222  *
223  * @param[in] it Iterator handle.
224  * @param[in] key Buffer for returned key.
225  * @param[in] key_size Key buffer size.
226  *
227  * @returns MBED_SUCCESS Success.
228  * MBED_ERROR_NOT_READY Not initialized.
229  * MBED_ERROR_READ_FAILED Unable to read from block device.
230  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
231  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
232  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
233  * MBED_ERROR_ITEM_NOT_FOUND No more keys found.
234  */
235  virtual int iterator_next(iterator_t it, char *key, size_t key_size);
236 
237  /**
238  * @brief Close iteration.
239  *
240  * @param[in] it Iterator handle.
241  *
242  * @returns MBED_SUCCESS Success.
243  * MBED_ERROR_NOT_READY Not initialized.
244  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
245  */
246  virtual int iterator_close(iterator_t it);
247 
248  /**
249  * @brief Set data in reserved area, which is a special location for special data, such as ROT.
250  * The data written to reserved area can't be overwritten.
251  *
252  * @param[in] reserved_data Reserved data buffer.
253  * @param[in] reserved_data_buf_size
254  * Reserved data buffer size.
255  *
256  * @returns MBED_SUCCESS Success.
257  * MBED_ERROR_NOT_READY Not initialized.
258  * MBED_ERROR_READ_FAILED Unable to read from media.
259  * MBED_ERROR_WRITE_FAILED Unable to write to media.
260  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
261  * MBED_ERROR_INVALID_SIZE Invalid size given in function arguments.
262  */
263  virtual int reserved_data_set(const void *reserved_data, size_t reserved_data_buf_size);
264 
265  /**
266  * @brief Get data from reserved area, which is a special location for special data, such as ROT.
267  *
268  * @param[in] reserved_data Reserved data buffer.
269  * @param[in] reserved_data_buf_size
270  * Reserved data buffer size.
271  * @param[in] actual_data_size Return data size.
272  *
273  * @returns MBED_SUCCESS Success.
274  * MBED_ERROR_NOT_READY Not initialized.
275  * MBED_ERROR_READ_FAILED Unable to read from media.
276  * MBED_ERROR_INVALID_ARGUMENT Invalid argument given in function arguments.
277  * MBED_ERROR_INVALID_DATA_DETECTED Data is corrupt.
278  * MBED_ERROR_ITEM_NOT_FOUND No reserved data was written.
279  */
280  virtual int reserved_data_get(void *reserved_data, size_t reserved_data_buf_size,
281  size_t *actual_data_size = 0);
282 
283 #if !defined(DOXYGEN_ONLY)
284 private:
285 
286  typedef struct {
287  uint32_t address;
288  size_t size;
289  } tdbstore_area_data_t;
290 
291  static const int _num_areas = 2;
292  static const int _max_open_iterators = 16;
293 
294  PlatformMutex _mutex;
295  PlatformMutex _inc_set_mutex;
296  void *_ram_table;
297  size_t _max_keys;
298  size_t _num_keys;
299  BlockDevice *_bd;
300  BufferedBlockDevice *_buff_bd;
301  uint32_t _free_space_offset;
302  uint32_t _master_record_offset;
303  uint32_t _master_record_size;
304  bool _is_initialized;
305  int _active_area;
306  uint16_t _active_area_version;
307  size_t _size;
308  tdbstore_area_data_t _area_params[_num_areas];
309  uint32_t _prog_size;
310  uint8_t *_work_buf;
311  char *_key_buf;
312  void *_inc_set_handle;
313  void *_iterator_table[_max_open_iterators];
314 
315  /**
316  * @brief Read a block from an area.
317  *
318  * @param[in] area Area.
319  * @param[in] offset Offset in area.
320  * @param[in] size Number of bytes to read.
321  * @param[in] buf Output buffer.
322  *
323  * @returns 0 for success, nonzero for failure.
324  */
325  int read_area(uint8_t area, uint32_t offset, uint32_t size, void *buf);
326 
327  /**
328  * @brief Write a block to an area.
329  *
330  * @param[in] area Area.
331  * @param[in] offset Offset in area.
332  * @param[in] size Number of bytes to write.
333  * @param[in] buf Input buffer.
334  *
335  * @returns 0 for success, non-zero for failure.
336  */
337  int write_area(uint8_t area, uint32_t offset, uint32_t size, const void *buf);
338 
339  /**
340  * @brief Reset an area (erase its start).
341  * This erases master record, but preserves the
342  * reserved area data.
343  *
344  * @param[in] area Area.
345  *
346  * @returns 0 for success, nonzero for failure.
347  */
348  int reset_area(uint8_t area);
349 
350  /**
351  * @brief Erase an erase unit.
352  *
353  * @param[in] area Area.
354  * @param[in] offset Offset in area.
355  *
356  * @returns 0 for success, nonzero for failure.
357  */
358  int erase_erase_unit(uint8_t area, uint32_t offset);
359 
360  /**
361  * @brief Calculate addresses and sizes of areas.
362  */
363  void calc_area_params();
364 
365  /**
366  * @brief Read a TDBStore record from a given location.
367  *
368  * @param[in] area Area.
369  * @param[in] offset Offset of record in area.
370  * @param[out] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
371  * @param[out] data_buf Data buffer.
372  * @param[in] data_buf_size Data buffer size.
373  * @param[out] actual_data_size Actual data size.
374  * @param[in] data_offset Offset in data.
375  * @param[in] copy_key Copy key to user buffer.
376  * @param[in] copy_data Copy data to user buffer.
377  * @param[in] check_expected_key Check whether key belongs to this record.
378  * @param[in] calc_hash Calculate hash (on key).
379  * @param[out] hash Calculated hash.
380  * @param[out] flags Record flags.
381  * @param[out] next_offset Offset of next record.
382  *
383  * @returns 0 for success, nonzero for failure.
384  */
385  int read_record(uint8_t area, uint32_t offset, char *key,
386  void *data_buf, uint32_t data_buf_size,
387  uint32_t &actual_data_size, size_t data_offset, bool copy_key,
388  bool copy_data, bool check_expected_key, bool calc_hash,
389  uint32_t &hash, uint32_t &flags, uint32_t &next_offset);
390 
391  /**
392  * @brief Write a master record of a given area.
393  *
394  * @param[in] area Area.
395  * @param[in] version Area version.
396  * @param[out] next_offset Offset of next record.
397  *
398  * @returns 0 for success, nonzero for failure.
399  */
400  int write_master_record(uint8_t area, uint16_t version, uint32_t &next_offset);
401 
402  /**
403  * @brief Copy a record from one area to the opposite one.
404  *
405  * @param[in] from_area Area to copy record from.
406  * @param[in] from_offset Offset in source area.
407  * @param[in] to_offset Offset in destination area.
408  * @param[out] to_next_offset Offset of next record in destination area.
409  *
410  * @returns 0 for success, nonzero for failure.
411  */
412  int copy_record(uint8_t from_area, uint32_t from_offset, uint32_t to_offset,
413  uint32_t &to_next_offset);
414 
415  /**
416  * @brief Garbage collection (compact all records from active area to the standby one).
417  *
418  * @returns 0 for success, nonzero for failure.
419  */
420  int garbage_collection();
421 
422  /**
423  * @brief Return record size given key and data size.
424  *
425  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
426  * @param[in] data_size Data size.
427  *
428  * @returns record size.
429  */
430  uint32_t record_size(const char *key, uint32_t data_size);
431 
432  /**
433  * @brief Find a record given key
434  *
435  * @param[in] area Area.
436  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
437  * @param[out] offset Offset of record.
438  * @param[out] ram_table_ind Index in RAM table (target one if not found).
439  * @param[out] hash Calculated key hash.
440  *
441  * @returns 0 for success, nonzero for failure.
442  */
443  int find_record(uint8_t area, const char *key, uint32_t &offset,
444  uint32_t &ram_table_ind, uint32_t &hash);
445  /**
446  * @brief Actual logics of get API (also covers all other get APIs).
447  *
448  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
449  * @param[in] copy_data Copy data to user buffer.
450  * @param[in] data_buf Buffer to store data on.
451  * @param[in] data_buf_size Data buffer size (bytes).
452  * @param[out] actual_data_size Actual data size (bytes).
453  * @param[out] flags Flags.
454  *
455  * @returns 0 for success, nonzero for failure.
456  */
457  int do_get(const char *key, bool copy_data,
458  void *data_buf, uint32_t data_buf_size, uint32_t &actual_data_size,
459  uint32_t &flags);
460 
461  /**
462  * @brief Actual logics of set API (covers also the remove API).
463  *
464  * @param[in] key Key - must not include '*' '/' '?' ':' ';' '\' '"' '|' ' ' '<' '>' '\'.
465  * @param[in] data_buf Data buffer.
466  * @param[in] data_buf_size Data buffer size (bytes).
467  * @param[in] flags Flags.
468  *
469  * @returns 0 for success, nonzero for failure.
470  */
471  int do_set(const char *key, const void *data_buf, uint32_t data_buf_size, uint32_t flags);
472 
473  /**
474  * @brief Build RAM table and update _free_space_offset (scanning all the records in the area).
475  *
476  * @returns 0 for success, nonzero for failure.
477  */
478  int build_ram_table();
479 
480  /**
481  * @brief Increment maximum number of keys and reallocate RAM table accordingly.
482  *
483  * @param[out] ram_table Updated RAM table.
484  *
485  * @returns 0 for success, nonzero for failure.
486  */
487  int increment_max_keys(void **ram_table = 0);
488 
489  /**
490  * @brief Calculate offset from start of erase unit.
491  *
492  * @param[in] area Area.
493  * @param[in] offset Offset in area.
494  * @param[out] offset_from_start Offset from start of erase unit.
495  * @param[out] dist_to_end Distance to end of erase unit.
496  *
497  * @returns offset in erase unit.
498  */
499  void offset_in_erase_unit(uint8_t area, uint32_t offset, uint32_t &offset_from_start,
500  uint32_t &dist_to_end);
501 
502  /**
503  * @brief Before writing a record, check whether you are crossing an erase unit.
504  * If you do, check if it's erased, and erase it if not.
505  *
506  * @param[in] area Area.
507  * @param[in] offset Offset in area.
508  * @param[in] size Write size.
509  * @param[in] force_check Force checking.
510  *
511  * @returns 0 for success, nonzero for failure.
512  */
513  int check_erase_before_write(uint8_t area, uint32_t offset, uint32_t size,
514  bool force_check = false);
515 
516  /**
517  * @brief Get data from reserved area - worker function.
518  * This verifies that reserved data on both areas have
519  * correct checksums. If given pointer is not NULL, also
520  * write the reserved data to buffer. If checksums are not
521  * valid, return error code, and don't write anything to any
522  * pointers.
523  *
524  * @param[out] reserved_data Reserved data buffer (NULL to return nothing).
525  * @param[in] reserved_data_buf_size
526  * Reserved data buffer size.
527  * @param[out] actual_data_size If not NULL, return actual data size.
528  * @param[out] copy_trailer If not NULL, copy the trailer content to given buffer.
529  *
530  * @returns 0 on success or a negative error code on failure
531  */
532  int do_reserved_data_get(void *reserved_data, size_t reserved_data_buf_size,
533  size_t *actual_data_size = 0, void *copy_trailer = 0);
534 
535  /**
536  * @brief Update all iterators after adding or deleting of keys.
537  *
538  * @param[in] added True if added, false if deleted.
539  * @param[in] ram_table_ind RAM table index.
540  *
541  * @returns none
542  */
543  void update_all_iterators(bool added, uint32_t ram_table_ind);
544 
545 #endif
546 
547 };
548 /** @}*/
549 
550 } // namespace mbed
551 
552 #endif
mbed::TDBStore::set_finalize
virtual int set_finalize(set_handle_t handle)
Finalize an incremental KVStore set sequence.
mbed::KVStore::info
Holds key information.
Definition: KVStore.h:48
mbed::TDBStore::~TDBStore
virtual ~TDBStore()
Class destructor.
mbed::BlockDevice
A hardware device capable of writing and reading blocks.
Definition: BlockDevice.h:48
mbed::TDBStore::TDBStore
TDBStore(BlockDevice *bd)
Class constructor.
mbed::TDBStore::set_start
virtual int set_start(set_handle_t *handle, const char *key, size_t final_data_size, uint32_t create_flags)
Start an incremental TDBStore set sequence.
mbed::TDBStore::init
virtual int init()
Initialize TDBStore.
mbed::TDBStore::iterator_next
virtual int iterator_next(iterator_t it, char *key, size_t key_size)
Get next key in iteration.
mbed::TDBStore::iterator_open
virtual int iterator_open(iterator_t *it, const char *prefix=NULL)
Start an iteration over KVStore keys.
mbed::TDBStore::set_add_data
virtual int set_add_data(set_handle_t handle, const void *value_data, size_t data_size)
Add data to incremental TDBStore set sequence.
PlatformMutex
The PlatformMutex class is used to synchronize the execution of threads.
Definition: PlatformMutex.h:47
mbed::BufferedBlockDevice
Block device for allowing minimal read and program sizes (of 1) for the underlying BD...
Definition: BufferedBlockDevice.h:36
mbed::KVStore
KVStore class.
Definition: KVStore.h:30
mbed::TDBStore::deinit
virtual int deinit()
Deinitialize TDBStore, release and free resources.
mbed::TDBStore
TDBStore class.
Definition: TDBStore.h:35
mbed::TDBStore::get_info
virtual int get_info(const char *key, info_t *info)
Get information of a given key.
mbed::TDBStore::reset
virtual int reset()
Reset TDBStore contents (clear all keys) and reserved data.
mbed::TDBStore::reserved_data_set
virtual int reserved_data_set(const void *reserved_data, size_t reserved_data_buf_size)
Set data in reserved area, which is a special location for special data, such as ROT.
mbed::TDBStore::iterator_close
virtual int iterator_close(iterator_t it)
Close iteration.
mbed
Definition: ATHandler.h:46
mbed::TDBStore::reserved_data_get
virtual int reserved_data_get(void *reserved_data, size_t reserved_data_buf_size, size_t *actual_data_size=0)
Get data from reserved area, which is a special location for special data, such as ROT...
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