tdb2: hash chaining

[ccan] / ccan / tdb2 / test / run-25-hashoverload.c

diff --git a/ccan/tdb2/test/run-25-hashoverload.c b/ccan/tdb2/test/run-25-hashoverload.c
new file mode 100644 (file)
index 0000000..68e5211
--- /dev/null
+++ b/ccan/tdb2/test/run-25-hashoverload.c
@@ -0,0 +1,117 @@
+#include <ccan/tdb2/tdb.c>
+#include <ccan/tdb2/free.c>
+#include <ccan/tdb2/lock.c>
+#include <ccan/tdb2/io.c>
+#include <ccan/tdb2/hash.c>
+#include <ccan/tdb2/transaction.c>
+#include <ccan/tdb2/traverse.c>
+#include <ccan/tdb2/check.c>
+#include <ccan/tap/tap.h>
+#include "logging.h"
+
+static uint64_t badhash(const void *key, size_t len, uint64_t seed, void *priv)
+{
+       return 0;
+}
+
+static int trav(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf, void *p)
+{
+       if (p)
+               return tdb_delete(tdb, key);
+       return 0;
+}
+
+int main(int argc, char *argv[])
+{
+       unsigned int i, j;
+       struct tdb_context *tdb;
+       struct tdb_data key = { (unsigned char *)&j, sizeof(j) };
+       struct tdb_data dbuf = { (unsigned char *)&j, sizeof(j) };
+       union tdb_attribute hattr = { .hash = { .base = { TDB_ATTRIBUTE_HASH },
+                                               .hash_fn = badhash } };
+       int flags[] = { TDB_INTERNAL, TDB_DEFAULT, TDB_NOMMAP,
+                       TDB_INTERNAL|TDB_CONVERT, TDB_CONVERT,
+                       TDB_NOMMAP|TDB_CONVERT,
+       };
+
+       hattr.base.next = &tap_log_attr;
+
+       plan_tests(5395);
+       for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) {
+               struct tdb_data d;
+
+               tdb = tdb_open("run-25-hashoverload.tdb", flags[i],
+                              O_RDWR|O_CREAT|O_TRUNC, 0600, &hattr);
+               ok1(tdb);
+               if (!tdb)
+                       continue;
+
+               /* Fill a group. */
+               for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++) {
+                       ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
+               }
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+
+               /* Now store one last value: should form chain. */
+               ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+
+               /* Check we can find them all. */
+               for (j = 0; j < (1 << TDB_HASH_GROUP_BITS) + 1; j++) {
+                       d = tdb_fetch(tdb, key);
+                       ok1(d.dsize == sizeof(j));
+                       ok1(d.dptr != NULL);
+                       ok1(d.dptr && memcmp(d.dptr, &j, d.dsize) == 0);
+               }
+
+               /* Now add a *lot* more. */
+               for (j = (1 << TDB_HASH_GROUP_BITS) + 1;
+                    j < (16 << TDB_HASH_GROUP_BITS);
+                    j++) {
+                       ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
+                       d = tdb_fetch(tdb, key);
+                       ok1(d.dsize == sizeof(j));
+                       ok1(d.dptr != NULL);
+                       ok1(d.dptr && memcmp(d.dptr, &j, d.dsize) == 0);
+               }
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+
+               /* Traverse through them. */
+               ok1(tdb_traverse(tdb, trav, NULL) == j);
+
+               /* Empty the first chain-worth. */
+               for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++)
+                       ok1(tdb_delete(tdb, key) == 0);
+
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+
+               for (j = (1 << TDB_HASH_GROUP_BITS);
+                    j < (16 << TDB_HASH_GROUP_BITS);
+                    j++) {
+                       d = tdb_fetch(tdb, key);
+                       ok1(d.dsize == sizeof(j));
+                       ok1(d.dptr != NULL);
+                       ok1(d.dptr && memcmp(d.dptr, &j, d.dsize) == 0);
+               }
+
+               /* Traverse through them. */
+               ok1(tdb_traverse(tdb, trav, NULL)
+                   == (15 << TDB_HASH_GROUP_BITS));
+
+               /* Re-add */
+               for (j = 0; j < (1 << TDB_HASH_GROUP_BITS); j++) {
+                       ok1(tdb_store(tdb, key, dbuf, TDB_INSERT) == 0);
+               }
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+
+               /* Now try deleting as we go. */
+               ok1(tdb_traverse(tdb, trav, trav)
+                   == (16 << TDB_HASH_GROUP_BITS));
+               ok1(tdb_check(tdb, NULL, NULL) == 0);
+               ok1(tdb_traverse(tdb, trav, NULL) == 0);
+               tdb_close(tdb);
+       }
+
+       ok1(tap_log_messages == 0);
+       return exit_status();
+}