by various parts of the Samba code
Copyright (C) Rafal Szczesniak 2002
-
+ Copyright (C) Volker Lendecke 2009
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#define DBGC_CLASS DBGC_TDB
#define TIMEOUT_LEN 12
-#define CACHE_DATA_FMT "%12u/%s"
+#define CACHE_DATA_FMT "%12u/"
+#define READ_CACHE_DATA_FMT_TEMPLATE "%%12u/%%%us"
+#define BLOB_TYPE "DATA_BLOB"
+#define BLOB_TYPE_LEN 9
-static TDB_CONTEXT *cache;
+static struct tdb_context *cache;
+static struct tdb_context *cache_notrans;
/**
* @file gencache.c
* false on failure
**/
-BOOL gencache_init(void)
+static bool gencache_init(void)
{
char* cache_fname = NULL;
-
+ int open_flags = O_RDWR|O_CREAT;
+ bool first_try = true;
+
/* skip file open if it's already opened */
if (cache) return True;
- asprintf(&cache_fname, "%s/%s", lp_lockdir(), "gencache.tdb");
- if (cache_fname)
- DEBUG(5, ("Opening cache file at %s\n", cache_fname));
- else {
- DEBUG(0, ("Filename allocation failed.\n"));
- return False;
+ cache_fname = lock_path("gencache.tdb");
+
+ DEBUG(5, ("Opening cache file at %s\n", cache_fname));
+
+again:
+ cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT|TDB_INCOMPATIBLE_HASH, open_flags, 0644);
+ if (cache) {
+ int ret;
+ ret = tdb_check(cache, NULL, NULL);
+ if (ret != 0) {
+ tdb_close(cache);
+ cache = NULL;
+ if (!first_try) {
+ DEBUG(0, ("gencache_init: tdb_check(%s) failed\n",
+ cache_fname));
+ return false;
+ }
+ first_try = false;
+ DEBUG(0, ("gencache_init: tdb_check(%s) failed - retry after CLEAR_IF_FIRST\n",
+ cache_fname));
+ cache = tdb_open_log(cache_fname, 0, TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH, open_flags, 0644);
+ if (cache) {
+ tdb_close(cache);
+ cache = NULL;
+ goto again;
+ }
+ }
}
- cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT,
- O_RDWR|O_CREAT, 0644);
+ if (!cache && (errno == EACCES)) {
+ open_flags = O_RDONLY;
+ cache = tdb_open_log(cache_fname, 0, TDB_DEFAULT|TDB_INCOMPATIBLE_HASH, open_flags,
+ 0644);
+ if (cache) {
+ DEBUG(5, ("gencache_init: Opening cache file %s read-only.\n", cache_fname));
+ }
+ }
- SAFE_FREE(cache_fname);
if (!cache) {
DEBUG(5, ("Attempt to open gencache.tdb has failed.\n"));
return False;
}
+
+ cache_fname = lock_path("gencache_notrans.tdb");
+
+ DEBUG(5, ("Opening cache file at %s\n", cache_fname));
+
+ cache_notrans = tdb_open_log(cache_fname, 0, TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH,
+ open_flags, 0644);
+ if (cache_notrans == NULL) {
+ DEBUG(5, ("Opening %s failed: %s\n", cache_fname,
+ strerror(errno)));
+ tdb_close(cache);
+ cache = NULL;
+ return false;
+ }
+
return True;
}
-
-/**
- * Cache shutdown function. Closes opened cache tdb file.
- *
- * @return true on successful closing the cache or
- * false on failure during cache shutdown
- **/
-
-BOOL gencache_shutdown(void)
+static TDB_DATA last_stabilize_key(void)
{
- int ret;
- /* tdb_close routine returns -1 on error */
- if (!cache) return False;
- DEBUG(5, ("Closing cache file\n"));
- ret = tdb_close(cache);
- cache = NULL;
- return ret != -1;
+ TDB_DATA result;
+ result.dptr = (uint8_t *)"@LAST_STABILIZED";
+ result.dsize = 17;
+ return result;
}
-
/**
* Set an entry in the cache file. If there's no such
* one, then add it.
*
* @param keystr string that represents a key of this entry
- * @param value text representation value being cached
+ * @param blob DATA_BLOB value being cached
* @param timeout time when the value is expired
*
* @retval true when entry is successfuly stored
* @retval false on failure
**/
-
-BOOL gencache_set(const char *keystr, const char *value, time_t timeout)
+
+bool gencache_set_data_blob(const char *keystr, const DATA_BLOB *blob,
+ time_t timeout)
{
int ret;
- TDB_DATA keybuf, databuf;
- char* valstr = NULL;
-
- /* fail completely if get null pointers passed */
- SMB_ASSERT(keystr && value);
+ TDB_DATA databuf;
+ char* val;
+ time_t last_stabilize;
+ static int writecount;
+
+ if (tdb_data_cmp(string_term_tdb_data(keystr),
+ last_stabilize_key()) == 0) {
+ DEBUG(10, ("Can't store %s as a key\n", keystr));
+ return false;
+ }
+
+ if ((keystr == NULL) || (blob == NULL)) {
+ return false;
+ }
if (!gencache_init()) return False;
-
- asprintf(&valstr, CACHE_DATA_FMT, (int)timeout, value);
- if (!valstr)
+
+ val = talloc_asprintf(talloc_tos(), CACHE_DATA_FMT, (int)timeout);
+ if (val == NULL) {
return False;
+ }
+ val = talloc_realloc(NULL, val, char, talloc_array_length(val)-1);
+ if (val == NULL) {
+ return false;
+ }
+ val = (char *)talloc_append_blob(NULL, val, *blob);
+ if (val == NULL) {
+ return false;
+ }
- keybuf.dptr = SMB_STRDUP(keystr);
- keybuf.dsize = strlen(keystr)+1;
- databuf.dptr = SMB_STRDUP(valstr);
- databuf.dsize = strlen(valstr)+1;
- DEBUG(10, ("Adding cache entry with key = %s; value = %s and timeout ="
- " %s (%d seconds %s)\n", keybuf.dptr, value,ctime(&timeout),
+ DEBUG(10, ("Adding cache entry with key = %s and timeout ="
+ " %s (%d seconds %s)\n", keystr, ctime(&timeout),
(int)(timeout - time(NULL)),
timeout > time(NULL) ? "ahead" : "in the past"));
- ret = tdb_store(cache, keybuf, databuf, 0);
- SAFE_FREE(valstr);
- SAFE_FREE(keybuf.dptr);
- SAFE_FREE(databuf.dptr);
-
+ ret = tdb_store_bystring(
+ cache_notrans, keystr,
+ make_tdb_data((uint8_t *)val, talloc_array_length(val)),
+ 0);
+ TALLOC_FREE(val);
+
+ if (ret != 0) {
+ return false;
+ }
+
+ /*
+ * Every 100 writes within a single process, stabilize the cache with
+ * a transaction. This is done to prevent a single transaction to
+ * become huge and chew lots of memory.
+ */
+ writecount += 1;
+ if (writecount > lp_parm_int(-1, "gencache", "stabilize_count", 100)) {
+ gencache_stabilize();
+ writecount = 0;
+ goto done;
+ }
+
+ /*
+ * Every 5 minutes, call gencache_stabilize() to not let grow
+ * gencache_notrans.tdb too large.
+ */
+
+ last_stabilize = 0;
+ databuf = tdb_fetch(cache_notrans, last_stabilize_key());
+ if ((databuf.dptr != NULL)
+ && (databuf.dptr[databuf.dsize-1] == '\0')) {
+ last_stabilize = atoi((char *)databuf.dptr);
+ SAFE_FREE(databuf.dptr);
+ }
+ if ((last_stabilize
+ + lp_parm_int(-1, "gencache", "stabilize_interval", 300))
+ < time(NULL)) {
+ gencache_stabilize();
+ }
+
+done:
return ret == 0;
}
-
/**
- * Set existing entry to the cache file.
+ * Delete one entry from the cache file.
*
* @param keystr string that represents a key of this entry
- * @param valstr text representation value being cached
- * @param timeout time when the value is expired
*
- * @retval true when entry is successfuly set
- * @retval false on failure
+ * @retval true upon successful deletion
+ * @retval false in case of failure
**/
-BOOL gencache_set_only(const char *keystr, const char *valstr, time_t timeout)
+bool gencache_del(const char *keystr)
{
- int ret = -1;
- TDB_DATA keybuf, databuf;
- char *old_valstr, *datastr;
- time_t old_timeout;
-
- /* fail completely if get null pointers passed */
- SMB_ASSERT(keystr && valstr);
+ bool exists, was_expired;
+ bool ret = false;
+ DATA_BLOB value;
- if (!gencache_init()) return False;
-
- /*
- * Check whether entry exists in the cache
- * Don't verify gencache_get exit code, since the entry may be expired
- */
- gencache_get(keystr, &old_valstr, &old_timeout);
-
- if (!(old_valstr && old_timeout)) return False;
-
- DEBUG(10, ("Setting cache entry with key = %s; old value = %s and old timeout \
- = %s\n", keystr, old_valstr, ctime(&old_timeout)));
-
- asprintf(&datastr, CACHE_DATA_FMT, (int)timeout, valstr);
- keybuf.dptr = SMB_STRDUP(keystr);
- keybuf.dsize = strlen(keystr)+1;
- databuf.dptr = SMB_STRDUP(datastr);
- databuf.dsize = strlen(datastr)+1;
- DEBUGADD(10, ("New value = %s, new timeout = %s (%d seconds %s)", valstr,
- ctime(&timeout), (int)(timeout - time(NULL)),
- timeout > time(NULL) ? "ahead" : "in the past"));
-
-
- ret = tdb_store(cache, keybuf, databuf, TDB_REPLACE);
-
- SAFE_FREE(datastr);
- SAFE_FREE(old_valstr);
- SAFE_FREE(keybuf.dptr);
- SAFE_FREE(databuf.dptr);
-
- return ret == 0;
+ if (keystr == NULL) {
+ return false;
+ }
+
+ if (!gencache_init()) return False;
+
+ DEBUG(10, ("Deleting cache entry (key = %s)\n", keystr));
+
+ /*
+ * We delete an element by setting its timeout to 0. This way we don't
+ * have to do a transaction on gencache.tdb every time we delete an
+ * element.
+ */
+
+ exists = gencache_get_data_blob(keystr, &value, NULL, &was_expired);
+
+ if (!exists && was_expired) {
+ /*
+ * gencache_get_data_blob has implicitly deleted this
+ * entry, so we have to return success here.
+ */
+ return true;
+ }
+
+ if (exists) {
+ data_blob_free(&value);
+ ret = gencache_set(keystr, "", 0);
+ }
+ return ret;
+}
+
+static bool gencache_pull_timeout(char *val, time_t *pres, char **pendptr)
+{
+ time_t res;
+ char *endptr;
+
+ if (val == NULL) {
+ return false;
+ }
+
+ res = strtol(val, &endptr, 10);
+
+ if ((endptr == NULL) || (*endptr != '/')) {
+ DEBUG(2, ("Invalid gencache data format: %s\n", val));
+ return false;
+ }
+ if (pres != NULL) {
+ *pres = res;
+ }
+ if (pendptr != NULL) {
+ *pendptr = endptr;
+ }
+ return true;
+}
+
+struct gencache_parse_state {
+ void (*parser)(time_t timeout, DATA_BLOB blob, void *private_data);
+ void *private_data;
+};
+
+static int gencache_parse_fn(TDB_DATA key, TDB_DATA data, void *private_data)
+{
+ struct gencache_parse_state *state;
+ DATA_BLOB blob;
+ time_t t;
+ char *endptr;
+ bool ret;
+
+ if (data.dptr == NULL) {
+ return -1;
+ }
+ ret = gencache_pull_timeout((char *)data.dptr, &t, &endptr);
+ if (!ret) {
+ return -1;
+ }
+ state = (struct gencache_parse_state *)private_data;
+ blob = data_blob_const(
+ endptr+1, data.dsize - PTR_DIFF(endptr+1, data.dptr));
+ state->parser(t, blob, state->private_data);
+ return 0;
+}
+
+bool gencache_parse(const char *keystr,
+ void (*parser)(time_t timeout, DATA_BLOB blob,
+ void *private_data),
+ void *private_data)
+{
+ struct gencache_parse_state state;
+ TDB_DATA key;
+ int ret;
+
+ if (keystr == NULL) {
+ return false;
+ }
+ if (tdb_data_cmp(string_term_tdb_data(keystr),
+ last_stabilize_key()) == 0) {
+ return false;
+ }
+ if (!gencache_init()) {
+ return false;
+ }
+
+ key = string_term_tdb_data(keystr);
+ state.parser = parser;
+ state.private_data = private_data;
+
+ ret = tdb_parse_record(cache_notrans, key, gencache_parse_fn, &state);
+ if (ret != -1) {
+ return true;
+ }
+ ret = tdb_parse_record(cache, key, gencache_parse_fn, &state);
+ return (ret != -1);
+}
+
+struct gencache_get_data_blob_state {
+ DATA_BLOB *blob;
+ time_t timeout;
+ bool result;
+};
+
+static void gencache_get_data_blob_parser(time_t timeout, DATA_BLOB blob,
+ void *private_data)
+{
+ struct gencache_get_data_blob_state *state =
+ (struct gencache_get_data_blob_state *)private_data;
+
+ if (timeout == 0) {
+ state->result = false;
+ return;
+ }
+ state->timeout = timeout;
+
+ if (state->blob == NULL) {
+ state->result = true;
+ return;
+ }
+
+ *state->blob = data_blob(blob.data, blob.length);
+ if (state->blob->data == NULL) {
+ state->result = false;
+ return;
+ }
+ state->result = true;
}
-
/**
- * Delete one entry from the cache file.
+ * Get existing entry from the cache file.
*
* @param keystr string that represents a key of this entry
+ * @param blob DATA_BLOB that is filled with entry's blob
+ * @param timeout pointer to a time_t that is filled with entry's
+ * timeout
*
- * @retval true upon successful deletion
- * @retval false in case of failure
+ * @retval true when entry is successfuly fetched
+ * @retval False for failure
**/
-BOOL gencache_del(const char *keystr)
+bool gencache_get_data_blob(const char *keystr, DATA_BLOB *blob,
+ time_t *timeout, bool *was_expired)
{
- int ret;
- TDB_DATA keybuf;
-
- /* fail completely if get null pointers passed */
- SMB_ASSERT(keystr);
+ struct gencache_get_data_blob_state state;
+ bool expired = false;
- if (!gencache_init()) return False;
-
- keybuf.dptr = SMB_STRDUP(keystr);
- keybuf.dsize = strlen(keystr)+1;
- DEBUG(10, ("Deleting cache entry (key = %s)\n", keystr));
- ret = tdb_delete(cache, keybuf);
-
- SAFE_FREE(keybuf.dptr);
- return ret == 0;
+ state.result = false;
+ state.blob = blob;
+
+ if (!gencache_parse(keystr, gencache_get_data_blob_parser, &state)) {
+ goto fail;
+ }
+ if (!state.result) {
+ goto fail;
+ }
+ if (state.timeout <= time(NULL)) {
+ /*
+ * We're expired, delete the entry. We can't use gencache_del
+ * here, because that uses gencache_get_data_blob for checking
+ * the existence of a record. We know the thing exists and
+ * directly store an empty value with 0 timeout.
+ */
+ gencache_set(keystr, "", 0);
+ expired = true;
+ goto fail;
+ }
+ if (timeout) {
+ *timeout = state.timeout;
+ }
+
+ return True;
+
+fail:
+ if (was_expired != NULL) {
+ *was_expired = expired;
+ }
+ if (state.result && state.blob) {
+ data_blob_free(state.blob);
+ }
+ return false;
+}
+
+struct stabilize_state {
+ bool written;
+ bool error;
+};
+static int stabilize_fn(struct tdb_context *tdb, TDB_DATA key, TDB_DATA val,
+ void *priv);
+
+/**
+ * Stabilize gencache
+ *
+ * Migrate the clear-if-first gencache data to the stable,
+ * transaction-based gencache.tdb
+ */
+
+bool gencache_stabilize(void)
+{
+ struct stabilize_state state;
+ int res;
+ char *now;
+
+ if (!gencache_init()) {
+ return false;
+ }
+
+ res = tdb_transaction_start_nonblock(cache);
+ if (res == -1) {
+
+ if (tdb_error(cache) == TDB_ERR_NOLOCK) {
+ /*
+ * Someone else already does the stabilize,
+ * this does not have to be done twice
+ */
+ return true;
+ }
+
+ DEBUG(10, ("Could not start transaction on gencache.tdb: "
+ "%s\n", tdb_errorstr(cache)));
+ return false;
+ }
+ res = tdb_transaction_start(cache_notrans);
+ if (res == -1) {
+ tdb_transaction_cancel(cache);
+ DEBUG(10, ("Could not start transaction on "
+ "gencache_notrans.tdb: %s\n",
+ tdb_errorstr(cache_notrans)));
+ return false;
+ }
+
+ state.error = false;
+ state.written = false;
+
+ res = tdb_traverse(cache_notrans, stabilize_fn, &state);
+ if ((res == -1) || state.error) {
+ if ((tdb_transaction_cancel(cache_notrans) == -1)
+ || (tdb_transaction_cancel(cache) == -1)) {
+ smb_panic("tdb_transaction_cancel failed\n");
+ }
+ return false;
+ }
+
+ if (!state.written) {
+ if ((tdb_transaction_cancel(cache_notrans) == -1)
+ || (tdb_transaction_cancel(cache) == -1)) {
+ smb_panic("tdb_transaction_cancel failed\n");
+ }
+ return true;
+ }
+
+ res = tdb_transaction_commit(cache);
+ if (res == -1) {
+ DEBUG(10, ("tdb_transaction_commit on gencache.tdb failed: "
+ "%s\n", tdb_errorstr(cache)));
+ if (tdb_transaction_cancel(cache_notrans) == -1) {
+ smb_panic("tdb_transaction_cancel failed\n");
+ }
+ return false;
+ }
+
+ res = tdb_transaction_commit(cache_notrans);
+ if (res == -1) {
+ DEBUG(10, ("tdb_transaction_commit on gencache.tdb failed: "
+ "%s\n", tdb_errorstr(cache)));
+ return false;
+ }
+
+ now = talloc_asprintf(talloc_tos(), "%d", (int)time(NULL));
+ if (now != NULL) {
+ tdb_store(cache_notrans, last_stabilize_key(),
+ string_term_tdb_data(now), 0);
+ TALLOC_FREE(now);
+ }
+
+ return true;
}
+static int stabilize_fn(struct tdb_context *tdb, TDB_DATA key, TDB_DATA val,
+ void *priv)
+{
+ struct stabilize_state *state = (struct stabilize_state *)priv;
+ int res;
+ time_t timeout;
+
+ if (tdb_data_cmp(key, last_stabilize_key()) == 0) {
+ return 0;
+ }
+
+ if (!gencache_pull_timeout((char *)val.dptr, &timeout, NULL)) {
+ DEBUG(10, ("Ignoring invalid entry\n"));
+ return 0;
+ }
+ if ((timeout < time(NULL)) || (val.dsize == 0)) {
+ res = tdb_delete(cache, key);
+ if ((res == -1) && (tdb_error(cache) == TDB_ERR_NOEXIST)) {
+ res = 0;
+ } else {
+ state->written = true;
+ }
+ } else {
+ res = tdb_store(cache, key, val, 0);
+ if (res == 0) {
+ state->written = true;
+ }
+ }
+
+ if (res == -1) {
+ DEBUG(10, ("Transfer to gencache.tdb failed: %s\n",
+ tdb_errorstr(cache)));
+ state->error = true;
+ return -1;
+ }
+
+ if (tdb_delete(cache_notrans, key) == -1) {
+ DEBUG(10, ("tdb_delete from gencache_notrans.tdb failed: "
+ "%s\n", tdb_errorstr(cache_notrans)));
+ state->error = true;
+ return -1;
+ }
+ return 0;
+}
/**
* Get existing entry from the cache file.
* @retval False for failure
**/
-BOOL gencache_get(const char *keystr, char **valstr, time_t *timeout)
+bool gencache_get(const char *keystr, char **value, time_t *ptimeout)
{
- TDB_DATA keybuf, databuf;
+ DATA_BLOB blob;
+ bool ret = False;
- /* fail completely if get null pointers passed */
- SMB_ASSERT(keystr);
-
- if (!gencache_init())
- return False;
-
- keybuf.dptr = SMB_STRDUP(keystr);
- keybuf.dsize = strlen(keystr)+1;
- databuf = tdb_fetch(cache, keybuf);
- SAFE_FREE(keybuf.dptr);
-
- if (databuf.dptr && databuf.dsize > TIMEOUT_LEN) {
- char* entry_buf = SMB_STRNDUP(databuf.dptr, databuf.dsize);
- char *v;
- time_t t;
- unsigned u;
- int status;
-
- v = SMB_MALLOC(databuf.dsize - TIMEOUT_LEN);
-
- SAFE_FREE(databuf.dptr);
- status = sscanf(entry_buf, CACHE_DATA_FMT, &u, v);
- if ( status != 2 ) {
- DEBUG(0, ("gencache_get: Invalid return %d from sscanf\n", status ));
+ ret = gencache_get_data_blob(keystr, &blob, ptimeout, NULL);
+ if (!ret) {
+ return false;
+ }
+ if ((blob.data == NULL) || (blob.length == 0)) {
+ SAFE_FREE(blob.data);
+ return false;
+ }
+ if (blob.data[blob.length-1] != '\0') {
+ /* Not NULL terminated, can't be a string */
+ SAFE_FREE(blob.data);
+ return false;
+ }
+ if (value) {
+ *value = SMB_STRDUP((char *)blob.data);
+ data_blob_free(&blob);
+ if (*value == NULL) {
+ return false;
}
- t = u;
- SAFE_FREE(entry_buf);
+ return true;
+ }
+ data_blob_free(&blob);
+ return true;
+}
- DEBUG(10, ("Returning %s cache entry: key = %s, value = %s, "
- "timeout = %s", t > time(NULL) ? "valid" :
- "expired", keystr, v, ctime(&t)));
+/**
+ * Set an entry in the cache file. If there's no such
+ * one, then add it.
+ *
+ * @param keystr string that represents a key of this entry
+ * @param value text representation value being cached
+ * @param timeout time when the value is expired
+ *
+ * @retval true when entry is successfuly stored
+ * @retval false on failure
+ **/
- if (valstr)
- *valstr = v;
- else
- SAFE_FREE(v);
+bool gencache_set(const char *keystr, const char *value, time_t timeout)
+{
+ DATA_BLOB blob = data_blob_const(value, strlen(value)+1);
+ return gencache_set_data_blob(keystr, &blob, timeout);
+}
- if (timeout)
- *timeout = t;
+struct gencache_iterate_blobs_state {
+ void (*fn)(const char *key, DATA_BLOB value,
+ time_t timeout, void *private_data);
+ const char *pattern;
+ void *private_data;
+ bool in_persistent;
+};
- return t > time(NULL);
+static int gencache_iterate_blobs_fn(struct tdb_context *tdb, TDB_DATA key,
+ TDB_DATA data, void *priv)
+{
+ struct gencache_iterate_blobs_state *state =
+ (struct gencache_iterate_blobs_state *)priv;
+ char *keystr;
+ char *free_key = NULL;
+ time_t timeout;
+ char *endptr;
+
+ if (tdb_data_cmp(key, last_stabilize_key()) == 0) {
+ return 0;
+ }
+ if (state->in_persistent && tdb_exists(cache_notrans, key)) {
+ return 0;
+ }
- }
+ if (key.dptr[key.dsize-1] == '\0') {
+ keystr = (char *)key.dptr;
+ } else {
+ /* ensure 0-termination */
+ keystr = SMB_STRNDUP((char *)key.dptr, key.dsize);
+ free_key = keystr;
+ }
- SAFE_FREE(databuf.dptr);
+ if (!gencache_pull_timeout((char *)data.dptr, &timeout, &endptr)) {
+ goto done;
+ }
+ endptr += 1;
- if (valstr)
- *valstr = NULL;
- if (timeout)
- timeout = NULL;
+ if (fnmatch(state->pattern, keystr, 0) != 0) {
+ goto done;
+ }
+
+ DEBUG(10, ("Calling function with arguments (key=%s, timeout=%s)\n",
+ keystr, ctime(&timeout)));
- DEBUG(10, ("Cache entry with key = %s couldn't be found\n", keystr));
+ state->fn(keystr,
+ data_blob_const(endptr,
+ data.dsize - PTR_DIFF(endptr, data.dptr)),
+ timeout, state->private_data);
- return False;
+ done:
+ SAFE_FREE(free_key);
+ return 0;
}
+void gencache_iterate_blobs(void (*fn)(const char *key, DATA_BLOB value,
+ time_t timeout, void *private_data),
+ void *private_data, const char *pattern)
+{
+ struct gencache_iterate_blobs_state state;
+
+ if ((fn == NULL) || (pattern == NULL) || !gencache_init()) {
+ return;
+ }
+
+ DEBUG(5, ("Searching cache keys with pattern %s\n", pattern));
+
+ state.fn = fn;
+ state.pattern = pattern;
+ state.private_data = private_data;
+
+ state.in_persistent = false;
+ tdb_traverse(cache_notrans, gencache_iterate_blobs_fn, &state);
+
+ state.in_persistent = true;
+ tdb_traverse(cache, gencache_iterate_blobs_fn, &state);
+}
/**
* Iterate through all entries which key matches to specified pattern
*
**/
-void gencache_iterate(void (*fn)(const char* key, const char *value, time_t timeout, void* dptr),
- void* data, const char* keystr_pattern)
+struct gencache_iterate_state {
+ void (*fn)(const char *key, const char *value, time_t timeout,
+ void *priv);
+ void *private_data;
+};
+
+static void gencache_iterate_fn(const char *key, DATA_BLOB value,
+ time_t timeout, void *private_data)
{
- TDB_LIST_NODE *node, *first_node;
- TDB_DATA databuf;
- char *keystr = NULL, *valstr = NULL, *entry = NULL;
- time_t timeout = 0;
- int status;
- unsigned u;
-
- /* fail completely if get null pointers passed */
- SMB_ASSERT(fn && keystr_pattern);
-
- if (!gencache_init()) return;
-
- DEBUG(5, ("Searching cache keys with pattern %s\n", keystr_pattern));
- node = tdb_search_keys(cache, keystr_pattern);
- first_node = node;
-
- while (node) {
- /* ensure null termination of the key string */
- keystr = SMB_STRNDUP(node->node_key.dptr, node->node_key.dsize);
-
- /*
- * We don't use gencache_get function, because we need to iterate through
- * all of the entries. Validity verification is up to fn routine.
- */
- databuf = tdb_fetch(cache, node->node_key);
- if (!databuf.dptr || databuf.dsize <= TIMEOUT_LEN) {
- SAFE_FREE(databuf.dptr);
- SAFE_FREE(keystr);
- node = node->next;
- continue;
- }
- entry = SMB_STRNDUP(databuf.dptr, databuf.dsize);
- SAFE_FREE(databuf.dptr);
- valstr = SMB_MALLOC(databuf.dsize - TIMEOUT_LEN);
- status = sscanf(entry, CACHE_DATA_FMT, &u, valstr);
- if ( status != 2 ) {
- DEBUG(0,("gencache_iterate: invalid return from sscanf %d\n",status));
- }
- timeout = u;
-
- DEBUG(10, ("Calling function with arguments (key = %s, value = %s, timeout = %s)\n",
- keystr, valstr, ctime(&timeout)));
- fn(keystr, valstr, timeout, data);
-
- SAFE_FREE(valstr);
- SAFE_FREE(entry);
- SAFE_FREE(keystr);
- node = node->next;
- }
-
- tdb_search_list_free(first_node);
-}
+ struct gencache_iterate_state *state =
+ (struct gencache_iterate_state *)private_data;
+ char *valstr;
+ char *free_val = NULL;
+
+ if (value.data[value.length-1] == '\0') {
+ valstr = (char *)value.data;
+ } else {
+ /* ensure 0-termination */
+ valstr = SMB_STRNDUP((char *)value.data, value.length);
+ free_val = valstr;
+ }
-/********************************************************************
- lock a key
-********************************************************************/
+ DEBUG(10, ("Calling function with arguments "
+ "(key = %s, value = %s, timeout = %s)\n",
+ key, valstr, ctime(&timeout)));
-int gencache_lock_entry( const char *key )
-{
- if (!gencache_init())
- return -1;
-
- return tdb_lock_bystring(cache, key, 0);
-}
+ state->fn(key, valstr, timeout, state->private_data);
-/********************************************************************
- unlock a key
-********************************************************************/
+ SAFE_FREE(free_val);
+}
-void gencache_unlock_entry( const char *key )
+void gencache_iterate(void (*fn)(const char *key, const char *value,
+ time_t timeout, void *dptr),
+ void *private_data, const char *pattern)
{
- if (!gencache_init())
+ struct gencache_iterate_state state;
+
+ if (fn == NULL) {
return;
-
- tdb_unlock_bystring(cache, key);
- return;
+ }
+ state.fn = fn;
+ state.private_data = private_data;
+ gencache_iterate_blobs(gencache_iterate_fn, &state, pattern);
}
-
-
git.samba.org / metze / samba / wip.git / blobdiff