/* Checks if the given KEY, VALUE pair can be inserted into this server's
* store. Returns 0 if it can, else a negative error code. */
int tpcfollower_put_check(tpcfollower_t *server, char *key, char *value) {
int check;
if (strlen(key) > MAX_KEYLEN || strlen(key) == 0)
return ERR_KEYLEN;
if (strlen(value) > MAX_VALLEN)
return ERR_VALLEN;
if ((check = kvstore_put_check(&server->store, key, value)) < 0)
return check;
return 0;
}
/* Adds the given KEY, VALUE entry to STORE. Returns 0 if successful, else a
* negative error code. See kvserver.h for a complete description of how
* entries are stored. */
int kvstore_put(kvstore_t *store, char *key, char *value) {
unsigned long hashval;
int counter, check;
size_t keylen = strlen(key), vallen = strlen(value);
char filename[MAX_FILENAME];
struct stat st;
FILE *file;
kventry_t *entry;
if ((check = kvstore_put_check(store, key, value)) < 0)
return check;
hashval = hash(key);
counter = find_entry(store, key, NULL);
pthread_rwlock_wrlock(&store->lock);
if (counter >= 0) {
/* Entry already exists, just update it. */
sprintf(filename, "%s/%lu-%u%s", store->dirname, hashval, counter,
KVSTORE_FILETYPE);
} else {
/* Search for the end of the hash chain to insert. */
counter = 0;
sprintf(filename, "%s/%lu-%u%s", store->dirname, hashval, counter++,
KVSTORE_FILETYPE);
while (stat(filename, &st) != -1)
sprintf(filename, "%s/%lu-%u%s", store->dirname, hashval, counter++,
KVSTORE_FILETYPE);
}
if ((file = fopen(filename, "w")) == NULL) {
pthread_rwlock_unlock(&store->lock);
return ERRFILACCESS;
}
entry = malloc(sizeof(kventry_t) + keylen + vallen + 2);
entry->length = keylen + vallen + 2;
strcpy(entry->data, key);
strcpy(entry->data + keylen + 1, value);
fwrite(entry, sizeof(kventry_t) + entry->length, 1, file);
fclose(file);
pthread_rwlock_unlock(&store->lock);
free(entry);
return 0;
}
/* Checks if the given KEY, VALUE pair can be inserted into this server's
* store. Returns 0 if it can, else a negative error code. */
int kvserver_put_check(kvserver_t *server, char *key, char *value) {
// OUR CODE HERE
return kvstore_put_check(&server->store, key, value);
}
