264 lines
13 KiB
C
264 lines
13 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#ifndef NETDATA_DICTIONARY_H
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#define NETDATA_DICTIONARY_H 1
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#include "../libnetdata.h"
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/*
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* Netdata DICTIONARY features:
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*
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* CLONE or LINK
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* Names and Values in the dictionary can be cloned or linked.
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* In clone mode, the dictionary does all the memory management.
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* The default is clone for both names and values.
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* Set DICTIONARY_FLAG_NAME_LINK_DONT_CLONE to link names.
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* Set DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE to link names.
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*
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* ORDERED
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* Items are ordered in the order they are added (new items are appended at the end).
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* You may reverse the order by setting the flag DICTIONARY_FLAG_ADD_IN_FRONT.
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*
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* LOOKUP
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* The dictionary uses JudyHS to maintain a very fast randomly accessible hash table.
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*
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* MULTI-THREADED and SINGLE-THREADED
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* Each dictionary may be single threaded (no locks), or multi-threaded (multiple readers or one writer).
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* The default is multi-threaded. Add the flag DICTIONARY_FLAG_SINGLE_THREADED for single-threaded.
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*
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* WALK-THROUGH and FOREACH traversal
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* The dictionary can be traversed on read or write mode, either with a callback (walkthrough) or with
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* a loop (foreach).
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*
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* In write mode traversal, the caller may delete only the current item, but may add as many items as needed.
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*
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*/
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typedef struct dictionary DICTIONARY;
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typedef struct dictionary_item DICTIONARY_ITEM;
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typedef enum dictionary_flags {
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DICTIONARY_FLAG_NONE = 0, // the default is the opposite of all below
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DICTIONARY_FLAG_SINGLE_THREADED = (1 << 0), // don't use any locks (default: use locks)
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DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE = (1 << 1), // don't copy the value, just point to the one provided (default: copy)
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DICTIONARY_FLAG_NAME_LINK_DONT_CLONE = (1 << 2), // don't copy the name, just point to the one provided (default: copy)
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DICTIONARY_FLAG_DONT_OVERWRITE_VALUE = (1 << 3), // don't overwrite values of dictionary items (default: overwrite)
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DICTIONARY_FLAG_ADD_IN_FRONT = (1 << 4), // add dictionary items at the front of the linked list (default: at the end)
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// to change the value of the following, you also need to change the corresponding #defines in dictionary.c
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DICTIONARY_FLAG_RESERVED1 = (1 << 28), // reserved for DICTIONARY_FLAG_EXCLUSIVE_ACCESS
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DICTIONARY_FLAG_RESERVED2 = (1 << 29), // reserved for DICTIONARY_FLAG_DESTROYED
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DICTIONARY_FLAG_RESERVED3 = (1 << 30), // reserved for DICTIONARY_FLAG_DEFER_ALL_DELETIONS
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} DICTIONARY_FLAGS;
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// Create a dictionary
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#ifdef NETDATA_INTERNAL_CHECKS
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#define dictionary_create(flags) dictionary_create_advanced_with_trace(flags, 0, __FUNCTION__, __LINE__, __FILE__);
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#define dictionary_create_advanced(flags) dictionary_create_advanced_with_trace(flags, 0, __FUNCTION__, __LINE__, __FILE__);
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extern DICTIONARY *dictionary_create_advanced_with_trace(DICTIONARY_FLAGS flags, size_t scratchpad_size, const char *function, size_t line, const char *file);
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#else
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#define dictionary_create(flags) dictionary_create_advanced(flags, 0);
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extern DICTIONARY *dictionary_create_advanced(DICTIONARY_FLAGS flags, size_t scratchpad_size);
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#endif
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extern void *dictionary_scratchpad(DICTIONARY *dict);
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// an insert callback to be called just after an item is added to the dictionary
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// this callback is called while the dictionary is write locked!
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extern void dictionary_register_insert_callback(DICTIONARY *dict, void (*ins_callback)(const char *name, void *value, void *data), void *data);
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// a delete callback to be called just before an item is deleted forever
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// this callback is called while the dictionary is write locked!
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extern void dictionary_register_delete_callback(DICTIONARY *dict, void (*del_callback)(const char *name, void *value, void *data), void *data);
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// a merge callback to be called when DICTIONARY_FLAG_DONT_OVERWRITE_VALUE
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// and an item is already found in the dictionary - the dictionary does nothing else in this case
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// the old_value will remain in the dictionary - the new_value is ignored
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extern void dictionary_register_conflict_callback(DICTIONARY *dict, void (*conflict_callback)(const char *name, void *old_value, void *new_value, void *data), void *data);
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// a reaction callback to be called after every item insertion or conflict
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// after the constructors have finished and the items are fully available for use
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// and the dictionary is not write locked anymore
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extern void dictionary_register_react_callback(DICTIONARY *dict, void (*react_callback)(const char *name, void *value, void *data), void *data);
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// Destroy a dictionary
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// returns the number of bytes freed
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// the returned value will not include name and value sizes if DICTIONARY_FLAG_WITH_STATISTICS is not set
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extern size_t dictionary_destroy(DICTIONARY *dict);
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// Set an item in the dictionary
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// - if an item with the same name does not exist, create one
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// - if an item with the same name exists, then:
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// a) if DICTIONARY_FLAG_DONT_OVERWRITE_VALUE is set, just return the existing value (ignore the new value)
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// else b) reset the value to the new value passed at the call
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//
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// When DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE is set, the value is linked, otherwise it is copied
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// When DICTIONARY_FLAG_NAME_LINK_DONT_CLONE is set, the name is linked, otherwise it is copied
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//
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// When neither DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE nor DICTIONARY_FLAG_NAME_LINK_DONT_CLONE are set, all the
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// memory management for names and values is done by the dictionary.
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//
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// Passing NULL as value, the dictionary will callocz() the newly allocated value, otherwise it will copy it.
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// Passing 0 as value_len, the dictionary will set the value to NULL (no allocations for value will be made).
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extern void *dictionary_set(DICTIONARY *dict, const char *name, void *value, size_t value_len);
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// Get an item from the dictionary
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// If it returns NULL, the item is not found
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extern void *dictionary_get(DICTIONARY *dict, const char *name);
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// Delete an item from the dictionary
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// returns 0 if the item was found and has been deleted
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// returns -1 if the item was not found in the index
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extern int dictionary_del(DICTIONARY *dict, const char *name);
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extern DICTIONARY_ITEM *dictionary_get_and_acquire_item_unsafe(DICTIONARY *dict, const char *name);
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extern DICTIONARY_ITEM *dictionary_get_and_acquire_item(DICTIONARY *dict, const char *name);
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extern DICTIONARY_ITEM *dictionary_set_and_acquire_item_unsafe(DICTIONARY *dict, const char *name, void *value, size_t value_len);
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extern DICTIONARY_ITEM *dictionary_set_and_acquire_item(DICTIONARY *dict, const char *name, void *value, size_t value_len);
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extern void dictionary_acquired_item_release_unsafe(DICTIONARY *dict, DICTIONARY_ITEM *item);
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extern void dictionary_acquired_item_release(DICTIONARY *dict, DICTIONARY_ITEM *item);
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extern DICTIONARY_ITEM *dictionary_acquired_item_dup(DICTIONARY_ITEM *item);
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extern const char *dictionary_acquired_item_name(DICTIONARY_ITEM *item);
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extern void *dictionary_acquired_item_value(DICTIONARY_ITEM *item);
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// UNSAFE functions, without locks
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// to be used when the user is traversing with the right lock type
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// Read lock is acquired by dictionary_walktrhough_read() and dfe_start_read()
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// Write lock is acquired by dictionary_walktrhough_write() and dfe_start_write()
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// For code readability, please use these macros:
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#define dictionary_get_having_read_lock(dict, name) dictionary_get_unsafe(dict, name)
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#define dictionary_get_having_write_lock(dict, name) dictionary_get_unsafe(dict, name)
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#define dictionary_set_having_write_lock(dict, name, value, value_len) dictionary_set_unsafe(dict, name, value, value_len)
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#define dictionary_del_having_write_lock(dict, name) dictionary_del_unsafe(dict, name)
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extern void *dictionary_get_unsafe(DICTIONARY *dict, const char *name);
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extern void *dictionary_set_unsafe(DICTIONARY *dict, const char *name, void *value, size_t value_len);
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extern int dictionary_del_unsafe(DICTIONARY *dict, const char *name);
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// Traverse (walk through) the items of the dictionary.
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// The order of traversal is currently the order of insertion.
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//
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// The callback function may return a negative number to stop the traversal,
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// in which case that negative value is returned to the caller.
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//
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// If all callback calls return zero or positive numbers, the sum of all of
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// them is returned to the caller.
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//
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// You cannot alter the dictionary from inside a dictionary_walkthrough_read() - deadlock!
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// You can only delete the current item from inside a dictionary_walkthrough_write() - you can add as many as you want.
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//
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#define dictionary_walkthrough_read(dict, callback, data) dictionary_walkthrough_rw(dict, 'r', callback, data)
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#define dictionary_walkthrough_write(dict, callback, data) dictionary_walkthrough_rw(dict, 'w', callback, data)
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extern int dictionary_walkthrough_rw(DICTIONARY *dict, char rw, int (*callback)(const char *name, void *value, void *data), void *data);
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#define dictionary_sorted_walkthrough_read(dict, callback, data) dictionary_sorted_walkthrough_rw(dict, 'r', callback, data)
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#define dictionary_sorted_walkthrough_write(dict, callback, data) dictionary_sorted_walkthrough_rw(dict, 'w', callback, data)
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int dictionary_sorted_walkthrough_rw(DICTIONARY *dict, char rw, int (*callback)(const char *name, void *entry, void *data), void *data);
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// Traverse with foreach
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//
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// Use like this:
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//
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// DICTFE dfe = {};
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// for(MY_ITEM *item = dfe_start_read(&dfe, dict); item ; item = dfe_next(&dfe)) {
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// // do things with the item and its dfe.name
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// }
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// dfe_done(&dfe);
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//
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// You cannot alter the dictionary from within a dfe_read_start() - deadlock!
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// You can only delete the current item from inside a dfe_start_write() - you can add as many as you want.
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//
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#ifdef DICTIONARY_INTERNALS
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#define DICTFE_CONST
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#else
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#define DICTFE_CONST const
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#endif
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#define DICTIONARY_LOCK_READ 'r'
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#define DICTIONARY_LOCK_WRITE 'w'
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#define DICTIONARY_LOCK_REENTRANT 'z'
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#define DICTIONARY_LOCK_NONE 'u'
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typedef DICTFE_CONST struct dictionary_foreach {
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DICTFE_CONST char *name; // the dictionary name of the last item used
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void *value; // the dictionary value of the last item used
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// same as the return value of dictfe_start() and dictfe_next()
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// the following are for internal use only - to keep track of the point we are
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char rw; // the lock mode 'r' or 'w'
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usec_t started_ut; // the time the caller started iterating (now_realtime_usec())
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DICTIONARY *dict; // the dictionary upon we work
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void *last_item; // the item we work on, to remember the position we are at
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} DICTFE;
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#define dfe_start_read(dict, value) dfe_start_rw(dict, value, DICTIONARY_LOCK_READ)
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#define dfe_start_write(dict, value) dfe_start_rw(dict, value, DICTIONARY_LOCK_WRITE)
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#define dfe_start_rw(dict, value, mode) \
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do { \
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DICTFE value ## _dfe = {}; \
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const char *value ## _name; (void)(value ## _name); (void)value; \
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for((value) = dictionary_foreach_start_rw(&value ## _dfe, (dict), (mode)), ( value ## _name ) = value ## _dfe.name; \
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(value ## _dfe.name) ;\
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(value) = dictionary_foreach_next(&value ## _dfe), ( value ## _name ) = value ## _dfe.name) \
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{
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#define dfe_done(value) \
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} \
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dictionary_foreach_done(&value ## _dfe); \
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} while(0)
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extern void * dictionary_foreach_start_rw(DICTFE *dfe, DICTIONARY *dict, char rw);
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extern void * dictionary_foreach_next(DICTFE *dfe);
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extern usec_t dictionary_foreach_done(DICTFE *dfe);
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// Get statistics about the dictionary
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extern long int dictionary_stats_allocated_memory(DICTIONARY *dict);
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extern long int dictionary_stats_entries(DICTIONARY *dict);
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extern size_t dictionary_stats_version(DICTIONARY *dict);
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extern size_t dictionary_stats_inserts(DICTIONARY *dict);
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extern size_t dictionary_stats_searches(DICTIONARY *dict);
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extern size_t dictionary_stats_deletes(DICTIONARY *dict);
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extern size_t dictionary_stats_resets(DICTIONARY *dict);
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extern size_t dictionary_stats_walkthroughs(DICTIONARY *dict);
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extern size_t dictionary_stats_referenced_items(DICTIONARY *dict);
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extern int dictionary_unittest(size_t entries);
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// ----------------------------------------------------------------------------
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// STRING implementation
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typedef struct netdata_string STRING;
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extern STRING *string_strdupz(const char *str);
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extern STRING *string_dup(STRING *string);
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extern void string_freez(STRING *string);
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extern size_t string_strlen(STRING *string);
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extern const char *string2str(STRING *string) NEVERNULL;
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// keep common prefix/suffix and replace everything else with [x]
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extern STRING *string_2way_merge(STRING *a, STRING *b);
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static inline int string_cmp(STRING *s1, STRING *s2) {
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// STRINGs are deduplicated, so the same strings have the same pointer
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// when they differ, we do the typical strcmp() comparison
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return (s1 == s2)?0:strcmp(string2str(s1), string2str(s2));
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}
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extern void string_statistics(size_t *inserts, size_t *deletes, size_t *searches, size_t *entries, size_t *references, size_t *memory, size_t *duplications, size_t *releases);
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// ----------------------------------------------------------------------------
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// THREAD CACHE
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extern void *thread_cache_entry_get_or_set(void *key,
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ssize_t key_length,
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void *value,
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void *(*transform_the_value_before_insert)(void *key, size_t key_length, void *value));
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extern void thread_cache_destroy(void);
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#endif /* NETDATA_DICTIONARY_H */
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