ntdb: next-generation trivial key-value database

[ccan] / ccan / ntdb / test / run-56-open-during-transaction.c

diff --git a/ccan/ntdb/test/run-56-open-during-transaction.c b/ccan/ntdb/test/run-56-open-during-transaction.c
new file mode 100644 (file)
index 0000000..1c8786c
--- /dev/null
+++ b/ccan/ntdb/test/run-56-open-during-transaction.c
@@ -0,0 +1,165 @@
+#include "private.h"
+#include <unistd.h>
+#include "lock-tracking.h"
+
+static ssize_t pwrite_check(int fd, const void *buf, size_t count, off_t offset);
+static ssize_t write_check(int fd, const void *buf, size_t count);
+static int ftruncate_check(int fd, off_t length);
+
+#define pwrite pwrite_check
+#define write write_check
+#define fcntl fcntl_with_lockcheck
+#define ftruncate ftruncate_check
+
+#include "ntdb-source.h"
+#include "tap-interface.h"
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include "external-agent.h"
+#include "logging.h"
+
+static struct agent *agent;
+static bool opened;
+static int errors = 0;
+#define TEST_DBNAME "run-56-open-during-transaction.ntdb"
+
+#undef write
+#undef pwrite
+#undef fcntl
+#undef ftruncate
+
+static bool is_same(const char *snapshot, const char *latest, off_t len)
+{
+       unsigned i;
+
+       for (i = 0; i < len; i++) {
+               if (snapshot[i] != latest[i])
+                       return false;
+       }
+       return true;
+}
+
+static bool compare_file(int fd, const char *snapshot, off_t snapshot_len)
+{
+       char *contents;
+       bool ret;
+
+       /* over-length read serves as length check. */
+       contents = malloc(snapshot_len+1);
+       ret = pread(fd, contents, snapshot_len+1, 0) == snapshot_len
+               && is_same(snapshot, contents, snapshot_len);
+       free(contents);
+       return ret;
+}
+
+static void check_file_intact(int fd)
+{
+       enum agent_return ret;
+       struct stat st;
+       char *contents;
+
+       fstat(fd, &st);
+       contents = malloc(st.st_size);
+       if (pread(fd, contents, st.st_size, 0) != st.st_size) {
+               diag("Read fail");
+               errors++;
+               return;
+       }
+
+       /* Ask agent to open file. */
+       ret = external_agent_operation(agent, OPEN, TEST_DBNAME);
+
+       /* It's OK to open it, but it must not have changed! */
+       if (!compare_file(fd, contents, st.st_size)) {
+               diag("Agent changed file after opening %s",
+                    agent_return_name(ret));
+               errors++;
+       }
+
+       if (ret == SUCCESS) {
+               ret = external_agent_operation(agent, CLOSE, NULL);
+               if (ret != SUCCESS) {
+                       diag("Agent failed to close ntdb: %s",
+                            agent_return_name(ret));
+                       errors++;
+               }
+       } else if (ret != WOULD_HAVE_BLOCKED) {
+               diag("Agent opening file gave %s",
+                    agent_return_name(ret));
+               errors++;
+       }
+
+       free(contents);
+}
+
+static void after_unlock(int fd)
+{
+       if (opened)
+               check_file_intact(fd);
+}
+
+static ssize_t pwrite_check(int fd,
+                           const void *buf, size_t count, off_t offset)
+{
+       if (opened)
+               check_file_intact(fd);
+
+       return pwrite(fd, buf, count, offset);
+}
+
+static ssize_t write_check(int fd, const void *buf, size_t count)
+{
+       if (opened)
+               check_file_intact(fd);
+
+       return write(fd, buf, count);
+}
+
+static int ftruncate_check(int fd, off_t length)
+{
+       if (opened)
+               check_file_intact(fd);
+
+       return ftruncate(fd, length);
+
+}
+
+int main(int argc, char *argv[])
+{
+       const int flags[] = { NTDB_DEFAULT, NTDB_NOMMAP,
+                       NTDB_CONVERT, NTDB_NOMMAP|NTDB_CONVERT };
+       int i;
+       struct ntdb_context *ntdb;
+       NTDB_DATA key, data;
+
+       plan_tests(sizeof(flags)/sizeof(flags[0]) * 5);
+       agent = prepare_external_agent();
+       if (!agent)
+               err(1, "preparing agent");
+
+       unlock_callback = after_unlock;
+       for (i = 0; i < sizeof(flags)/sizeof(flags[0]); i++) {
+               diag("Test with %s and %s\n",
+                    (flags[i] & NTDB_CONVERT) ? "CONVERT" : "DEFAULT",
+                    (flags[i] & NTDB_NOMMAP) ? "no mmap" : "mmap");
+               unlink(TEST_DBNAME);
+               ntdb = ntdb_open(TEST_DBNAME, flags[i]|MAYBE_NOSYNC,
+                                O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr);
+               ok1(ntdb);
+
+               opened = true;
+               ok1(ntdb_transaction_start(ntdb) == 0);
+               key = ntdb_mkdata("hi", strlen("hi"));
+               data = ntdb_mkdata("world", strlen("world"));
+
+               ok1(ntdb_store(ntdb, key, data, NTDB_INSERT) == 0);
+               ok1(ntdb_transaction_commit(ntdb) == 0);
+               ok(!errors, "We had %u open errors", errors);
+
+               opened = false;
+               ntdb_close(ntdb);
+       }
+
+       return exit_status();
+}