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feat(lsm): implement a simple trie remove

lsm
Jef Roosens 2023-10-14 15:57:33 +02:00
parent 682f422e3c
commit 6938c29725
Signed by: Jef Roosens
GPG Key ID: B75D4F293C7052DB
5 changed files with 147 additions and 34 deletions
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10
lsm/include/lsm/bt.h
View File

@ -20,6 +20,16 @@ lsm_error lsm_bt_init(lsm_bt **ptr);
*/
void lsm_bt_free(lsm_bt *bt);
/**
* Remove the binary tree's entire contents, but keep the struct allocated.
*/
void lsm_bt_clear(lsm_bt *bt);
/**
* Return the size of the binary tree
*/
uint64_t lsm_bt_size(lsm_bt *bt);
/**
* Search for the data stored behind the given key.
*

30
lsm/src/bt/lsm_bt.c
View File

@ -18,16 +18,16 @@ lsm_error lsm_bt_node_init(lsm_bt_node **ptr, const char key, void *data) {
void lsm_bt_node_free(lsm_bt_node *node) { free(node); }
void lsm_bt_node_free_recursive(lsm_bt_node *node) {
void lsm_bt_node_free_tree(lsm_bt_node *node) {
if (node->left != NULL) {
lsm_bt_node_free_recursive(node->left);
lsm_bt_node_free_tree(node->left);
lsm_bt_node_free(node->left);
}
if (node->right != NULL) {
lsm_bt_node_free_recursive(node->right);
lsm_bt_node_free_tree(node->right);
lsm_bt_node_free(node->right);
}
lsm_bt_node_free(node);
}
lsm_error lsm_bt_init(lsm_bt **ptr) {
@ -42,14 +42,23 @@ lsm_error lsm_bt_init(lsm_bt **ptr) {
return lsm_error_ok;
}
void lsm_bt_free(lsm_bt *bt) {
void lsm_bt_clear(lsm_bt *bt) {
if (bt->root != NULL) {
lsm_bt_node_free_recursive(bt->root);
lsm_bt_node_free_tree(bt->root);
lsm_bt_node_free(bt->root);
bt->root = NULL;
bt->size = 0;
}
}
void lsm_bt_free(lsm_bt *bt) {
lsm_bt_clear(bt);
free(bt);
}
uint64_t lsm_bt_size(lsm_bt *bt) { return bt->size; }
lsm_error lsm_bt_insert(lsm_bt *bt, char key, void *data) {
lsm_bt_node **dest = &bt->root;
@ -85,7 +94,9 @@ lsm_error lsm_bt_search(void **out, lsm_bt *bt, char key) {
return lsm_error_not_found;
}
if (out != NULL) {
*out = node->data;
}
return lsm_error_ok;
}
@ -105,7 +116,9 @@ lsm_error lsm_bt_remove(void **out, lsm_bt *bt, char key) {
return lsm_error_not_found;
}
if (out != NULL) {
*out = (*dest)->data;
}
bt->size--;
if (((*dest)->left != NULL) && ((*dest)->right != NULL)) {
@ -142,7 +155,10 @@ lsm_error lsm_bt_replace(void **out, lsm_bt *bt, char key, void *data) {
return lsm_error_not_found;
}
if (out != NULL) {
*out = node->data;
}
node->data = data;
return lsm_error_ok;

87
lsm/src/trie/lsm_trie.c
View File

@ -16,6 +16,12 @@ lsm_error lsm_trie_node_init(lsm_trie_node **ptr) {
return lsm_error_ok;
}
void lsm_trie_node_free(lsm_trie_node *node) {
lsm_bt_clear(&node->bt);
lsm_str_zero(&node->skip);
free(node);
}
lsm_error lsm_trie_init(lsm_trie **ptr) {
lsm_trie *trie = calloc(1, sizeof(lsm_trie));
@ -142,12 +148,14 @@ lsm_error lsm_trie_insert(lsm_trie *trie, lsm_str *key, void *data) {
return lsm_error_ok;
}
lsm_error lsm_trie_search(void **data, lsm_trie *trie, lsm_str *key) {
lsm_error lsm_trie_search(void **out, lsm_trie *trie, lsm_str *key) {
uint64_t key_len = lsm_str_len(key);
if (key_len == 0) {
if (trie->root->data != NULL) {
*data = trie->root->data;
if (out != NULL) {
*out = trie->root->data;
}
return lsm_error_ok;
} else {
@ -185,7 +193,80 @@ lsm_error lsm_trie_search(void **data, lsm_trie *trie, lsm_str *key) {
return lsm_error_not_found;
}
*data = node->data;
if (out != NULL) {
*out = node->data;
}
return lsm_error_ok;
}
lsm_error lsm_trie_remove(void **data, lsm_trie *trie, lsm_str *key) {
uint64_t key_len = lsm_str_len(key);
if (key_len == 0) {
if (trie->root->data != NULL) {
if (data != NULL) {
*data = trie->root->data;
}
trie->root->data = NULL;
trie->size--;
return lsm_error_ok;
} else {
return lsm_error_not_found;
}
}
uint64_t index = 0;
lsm_trie_node *parent = trie->root;
lsm_trie_node *child;
lsm_error res;
char c;
while (index < key_len) {
c = lsm_str_char(key, index);
res = lsm_bt_search((void **)&child, &parent->bt, c);
if (res != lsm_error_ok) {
return res;
}
index++;
uint64_t cmp = lsm_str_cmp(key, index, &child->skip, 0);
// If we end in the middle of an edge, we definitely haven't found the node
if (cmp != lsm_str_len(&child->skip)) {
return lsm_error_not_found;
}
index += cmp;
// This context is needed for the removal
if (index < key_len) {
parent = child;
}
}
if (child->data == NULL) {
return lsm_error_not_found;
}
// Child is the node we wish to delete
if (data != NULL) {
*data = child->data;
}
child->data = NULL;
// We only remove child if it has no children of its own
if (lsm_bt_size(&child->bt) == 0) {
lsm_bt_remove(NULL, &parent->bt, c);
lsm_trie_node_free(child);
}
trie->size--;
return lsm_error_ok;
}

6
lsm/test/bt/bt.c
View File

@ -54,6 +54,8 @@ void test_insert_multiple() {
TEST_CHECK(lsm_bt_insert(bt, chars[i], (void *)(i + 1)) == lsm_error_ok);
}
TEST_CHECK(lsm_bt_size(bt) == char_count);
void *data;
for (size_t i = 0; i < char_count; i++) {
TEST_CHECK(lsm_bt_insert(bt, chars[i], (void *)(i + 1)) == lsm_error_already_present);
@ -68,11 +70,13 @@ void test_remove_root() {
BT_INIT();
TEST_CHECK(lsm_bt_insert(bt, 'a', (void *)1) == lsm_error_ok);
TEST_CHECK(lsm_bt_size(bt) == 1);
void *data;
TEST_CHECK(lsm_bt_remove(&data, bt, 'a') == lsm_error_ok);
TEST_CHECK(data == (void *)1);
TEST_CHECK(bt->root == NULL);
TEST_CHECK(lsm_bt_size(bt) == 0);
lsm_bt_free(bt);
}
@ -95,6 +99,8 @@ void test_remove_multiple() {
TEST_CHECK(data == (void *)6);
TEST_CHECK(lsm_bt_remove(&data, bt, 'e') == lsm_error_not_found);
TEST_CHECK(lsm_bt_size(bt) == char_count - 2);
lsm_bt_free(bt);
}

40
lsm/test/trie/fuzzy.h
View File

@ -122,8 +122,7 @@ int fuzzy_test_trie_seed(FuzzyConfig conf) {
lsm_trie *trie;
lsm_trie_init(&trie);
bool changed;
lsm_error status;
lsm_error res;
// 0: success
// 1: invalid add
@ -134,13 +133,13 @@ int fuzzy_test_trie_seed(FuzzyConfig conf) {
// Add all strings to trie, checking for duplicates
for (int i = 0; i < conf.word_count; i++) {
status = lsm_trie_insert(trie, &matrix[i], (void **)1);
res = lsm_trie_insert(trie, &matrix[i], (void **)1);
// if changed is false, *contains_dedupped[i] should be true, as changed
// can only be false if the string is already contained in the trie. if
// changed is true, *contains_dedupped[i] should be false, as the string
// cannot be in the trie yet.
if (status == lsm_error_ok && *contains_dedupped[i]) {
if (res == lsm_error_ok && *contains_dedupped[i]) {
exit_code = 1;
goto END;
}
@ -159,26 +158,27 @@ int fuzzy_test_trie_seed(FuzzyConfig conf) {
}
// Remove all strings again, again taking duplicates into consideration
/* for (int i = 0; i < conf.word_count; i++) { */
/* changed = remove_func(ct, matrix[i]); */
for (int i = 0; i < conf.word_count; i++) {
res = lsm_trie_remove(NULL, trie, &matrix[i]);
/* // The string shouldn't be in the trie, yet another add operation */
/* // says it added it as well */
/* if (changed != *contains_dedupped[i]) { */
/* exit_code = 2; */
/* goto END; */
/* } */
// The string shouldn't be in the trie, yet another add operation
// says it added it as well
if (res == lsm_error_ok && !*contains_dedupped[i]) {
exit_code = 2;
goto END;
}
/* if (*contains_dedupped[i]) { */
/* *contains_dedupped[i] = false; */
/* size--; */
/* } */
/* } */
if (*contains_dedupped[i]) {
*contains_dedupped[i] = false;
size--;
}
}
// Finally, check that the trie is completely empty
/* if (size_func(ct) != 0) { */
/* exit_code = 4; */
/* } */
if (lsm_trie_size(trie) != 0) {
printf("%lu %lu\n", lsm_trie_size(trie), size);
exit_code = 4;
}
END:
/* trie_free(ct); */