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util: add helper APIs for dealing with inotify in portable manner
The inotify userspace API for reading events is quite horrible, so it is useful to wrap it in a more friendly API to avoid duplicating code across many users in QEMU. Wrapping it also allows introduction of a platform portability layer, so that we can add impls for non-Linux based equivalents in future. Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé
parent
d88d85f1f0
commit
90e33dfec6
9 changed files with 1234 additions and 1 deletions
685
tests/test-util-filemonitor.c
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685
tests/test-util-filemonitor.c
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/*
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* Tests for util/filemonitor-*.c
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*
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* Copyright 2018 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "qapi/error.h"
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#include "qemu/filemonitor.h"
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#include <utime.h>
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enum {
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QFILE_MONITOR_TEST_OP_CREATE,
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QFILE_MONITOR_TEST_OP_APPEND,
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QFILE_MONITOR_TEST_OP_TRUNC,
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QFILE_MONITOR_TEST_OP_RENAME,
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QFILE_MONITOR_TEST_OP_TOUCH,
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QFILE_MONITOR_TEST_OP_UNLINK,
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};
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typedef struct {
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int type;
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const char *filesrc;
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const char *filedst;
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} QFileMonitorTestOp;
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typedef struct {
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const char *file;
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} QFileMonitorTestWatch;
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typedef struct {
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gsize nwatches;
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const QFileMonitorTestWatch *watches;
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gsize nops;
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const QFileMonitorTestOp *ops;
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} QFileMonitorTestPlan;
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typedef struct {
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int id;
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QFileMonitorEvent event;
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char *filename;
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} QFileMonitorTestRecord;
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typedef struct {
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QemuMutex lock;
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GList *records;
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} QFileMonitorTestData;
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static QemuMutex evlock;
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static bool evstopping;
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static bool evrunning;
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/*
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* Main function for a background thread that is
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* running the event loop during the test
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*/
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static void *
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qemu_file_monitor_test_event_loop(void *opaque G_GNUC_UNUSED)
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{
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qemu_mutex_lock(&evlock);
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while (!evstopping) {
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qemu_mutex_unlock(&evlock);
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main_loop_wait(true);
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qemu_mutex_lock(&evlock);
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}
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evrunning = false;
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qemu_mutex_unlock(&evlock);
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return NULL;
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}
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/*
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* File monitor event handler which simply maintains
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* an ordered list of all events that it receives
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*/
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static void
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qemu_file_monitor_test_handler(int id,
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QFileMonitorEvent event,
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const char *filename,
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void *opaque)
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{
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QFileMonitorTestData *data = opaque;
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QFileMonitorTestRecord *rec = g_new0(QFileMonitorTestRecord, 1);
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rec->id = id;
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rec->event = event;
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rec->filename = g_strdup(filename);
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qemu_mutex_lock(&data->lock);
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data->records = g_list_append(data->records, rec);
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qemu_mutex_unlock(&data->lock);
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}
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static void
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qemu_file_monitor_test_record_free(QFileMonitorTestRecord *rec)
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{
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g_free(rec->filename);
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g_free(rec);
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}
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/*
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* Get the next event record that has been received by
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* the file monitor event handler. Since events are
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* emitted in the background thread running the event
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* loop, we can't assume there is a record available
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* immediately. Thus we will sleep for upto 5 seconds
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* to wait for the event to be queued for us.
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*/
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static QFileMonitorTestRecord *
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qemu_file_monitor_test_next_record(QFileMonitorTestData *data)
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{
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GTimer *timer = g_timer_new();
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QFileMonitorTestRecord *record = NULL;
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GList *tmp;
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qemu_mutex_lock(&data->lock);
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while (!data->records && g_timer_elapsed(timer, NULL) < 5) {
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qemu_mutex_unlock(&data->lock);
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usleep(10 * 1000);
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qemu_mutex_lock(&data->lock);
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}
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if (data->records) {
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record = data->records->data;
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tmp = data->records;
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data->records = g_list_remove_link(data->records, tmp);
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g_list_free(tmp);
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}
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qemu_mutex_unlock(&data->lock);
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g_timer_destroy(timer);
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return record;
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}
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/*
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* Check whether the event record we retrieved matches
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* data we were expecting to see for the event
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*/
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static bool
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qemu_file_monitor_test_expect(QFileMonitorTestData *data,
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int id,
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QFileMonitorEvent event,
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const char *filename)
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{
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QFileMonitorTestRecord *rec;
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bool ret = false;
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rec = qemu_file_monitor_test_next_record(data);
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if (!rec) {
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g_printerr("Missing event watch id %d event %d file %s\n",
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id, event, filename);
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return false;
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}
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if (id != rec->id) {
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g_printerr("Expected watch id %d but got %d\n", id, rec->id);
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goto cleanup;
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}
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if (event != rec->event) {
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g_printerr("Expected event %d but got %d\n", event, rec->event);
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goto cleanup;
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}
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if (!g_str_equal(filename, rec->filename)) {
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g_printerr("Expected filename %s but got %s\n",
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filename, rec->filename);
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goto cleanup;
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}
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ret = true;
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cleanup:
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qemu_file_monitor_test_record_free(rec);
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return ret;
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}
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static void
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test_file_monitor_events(const void *opaque)
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{
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const QFileMonitorTestPlan *plan = opaque;
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Error *local_err = NULL;
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GError *gerr = NULL;
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QFileMonitor *mon = qemu_file_monitor_new(&local_err);
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QemuThread th;
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GTimer *timer;
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gchar *dir = NULL;
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int err = -1;
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gsize i, j;
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char *pathsrc = NULL;
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char *pathdst = NULL;
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QFileMonitorTestData data;
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qemu_mutex_init(&data.lock);
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data.records = NULL;
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/*
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* The file monitor needs the main loop running in
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* order to receive events from inotify. We must
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* thus spawn a background thread to run an event
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* loop impl, while this thread triggers the
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* actual file operations we're testing
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*/
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evrunning = 1;
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evstopping = 0;
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qemu_thread_create(&th, "event-loop",
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qemu_file_monitor_test_event_loop, NULL,
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QEMU_THREAD_JOINABLE);
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if (local_err) {
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g_printerr("File monitoring not available: %s",
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error_get_pretty(local_err));
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error_free(local_err);
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return;
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}
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dir = g_dir_make_tmp("test-util-filemonitor-XXXXXX",
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&gerr);
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if (!dir) {
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g_printerr("Unable to create tmp dir %s",
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gerr->message);
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g_error_free(gerr);
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abort();
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}
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/*
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* First register all the directory / file watches
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* we're interested in seeing events against
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*/
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for (i = 0; i < plan->nwatches; i++) {
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int watchid;
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watchid = qemu_file_monitor_add_watch(mon,
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dir,
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plan->watches[i].file,
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qemu_file_monitor_test_handler,
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&data,
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&local_err);
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if (watchid < 0) {
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g_printerr("Unable to add watch %s",
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error_get_pretty(local_err));
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goto cleanup;
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}
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}
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/*
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* Now invoke all the file operations (create,
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* delete, rename, chmod, etc). These operations
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* will trigger the various file monitor events
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*/
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for (i = 0; i < plan->nops; i++) {
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const QFileMonitorTestOp *op = &(plan->ops[i]);
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int fd;
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struct utimbuf ubuf;
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pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
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if (op->filedst) {
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pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
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}
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switch (op->type) {
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case QFILE_MONITOR_TEST_OP_CREATE:
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fd = open(pathsrc, O_WRONLY | O_CREAT, 0700);
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if (fd < 0) {
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g_printerr("Unable to create %s: %s",
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pathsrc, strerror(errno));
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goto cleanup;
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}
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close(fd);
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break;
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case QFILE_MONITOR_TEST_OP_APPEND:
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fd = open(pathsrc, O_WRONLY | O_APPEND, 0700);
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if (fd < 0) {
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g_printerr("Unable to open %s: %s",
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pathsrc, strerror(errno));
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goto cleanup;
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}
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if (write(fd, "Hello World", 10) != 10) {
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g_printerr("Unable to write %s: %s",
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pathsrc, strerror(errno));
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close(fd);
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goto cleanup;
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}
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close(fd);
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break;
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case QFILE_MONITOR_TEST_OP_TRUNC:
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if (truncate(pathsrc, 4) < 0) {
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g_printerr("Unable to truncate %s: %s",
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pathsrc, strerror(errno));
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_RENAME:
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if (rename(pathsrc, pathdst) < 0) {
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g_printerr("Unable to rename %s to %s: %s",
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pathsrc, pathdst, strerror(errno));
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_UNLINK:
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if (unlink(pathsrc) < 0) {
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g_printerr("Unable to unlink %s: %s",
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pathsrc, strerror(errno));
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_TOUCH:
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ubuf.actime = 1024;
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ubuf.modtime = 1025;
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if (utime(pathsrc, &ubuf) < 0) {
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g_printerr("Unable to touch %s: %s",
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pathsrc, strerror(errno));
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goto cleanup;
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}
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break;
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default:
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g_assert_not_reached();
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}
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g_free(pathsrc);
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g_free(pathdst);
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pathsrc = pathdst = NULL;
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}
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/*
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* Finally validate that we have received all the events
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* we expect to see for the combination of watches and
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* file operations
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*/
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for (i = 0; i < plan->nops; i++) {
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const QFileMonitorTestOp *op = &(plan->ops[i]);
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switch (op->type) {
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case QFILE_MONITOR_TEST_OP_CREATE:
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for (j = 0; j < plan->nwatches; j++) {
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if (plan->watches[j].file &&
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!g_str_equal(plan->watches[j].file, op->filesrc))
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continue;
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if (!qemu_file_monitor_test_expect(
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&data, j, QFILE_MONITOR_EVENT_CREATED, op->filesrc))
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_APPEND:
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case QFILE_MONITOR_TEST_OP_TRUNC:
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for (j = 0; j < plan->nwatches; j++) {
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if (plan->watches[j].file &&
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!g_str_equal(plan->watches[j].file, op->filesrc))
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continue;
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if (!qemu_file_monitor_test_expect(
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&data, j, QFILE_MONITOR_EVENT_MODIFIED, op->filesrc))
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_RENAME:
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for (j = 0; j < plan->nwatches; j++) {
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if (plan->watches[j].file &&
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!g_str_equal(plan->watches[j].file, op->filesrc))
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continue;
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if (!qemu_file_monitor_test_expect(
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&data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
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goto cleanup;
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}
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for (j = 0; j < plan->nwatches; j++) {
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if (plan->watches[j].file &&
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!g_str_equal(plan->watches[j].file, op->filedst))
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continue;
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if (!qemu_file_monitor_test_expect(
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&data, j, QFILE_MONITOR_EVENT_CREATED, op->filedst))
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goto cleanup;
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}
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break;
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case QFILE_MONITOR_TEST_OP_TOUCH:
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for (j = 0; j < plan->nwatches; j++) {
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if (plan->watches[j].file &&
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!g_str_equal(plan->watches[j].file, op->filesrc))
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continue;
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|
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if (!qemu_file_monitor_test_expect(
|
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&data, j, QFILE_MONITOR_EVENT_ATTRIBUTES, op->filesrc))
|
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goto cleanup;
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}
|
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break;
|
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|
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case QFILE_MONITOR_TEST_OP_UNLINK:
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for (j = 0; j < plan->nwatches; j++) {
|
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if (plan->watches[j].file &&
|
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!g_str_equal(plan->watches[j].file, op->filesrc))
|
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continue;
|
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|
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if (!qemu_file_monitor_test_expect(
|
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&data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
|
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goto cleanup;
|
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}
|
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break;
|
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|
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default:
|
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g_assert_not_reached();
|
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}
|
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}
|
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|
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err = 0;
|
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|
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cleanup:
|
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g_free(pathsrc);
|
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g_free(pathdst);
|
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|
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qemu_mutex_lock(&evlock);
|
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evstopping = 1;
|
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timer = g_timer_new();
|
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while (evrunning && g_timer_elapsed(timer, NULL) < 5) {
|
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qemu_mutex_unlock(&evlock);
|
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usleep(10 * 1000);
|
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qemu_mutex_lock(&evlock);
|
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}
|
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qemu_mutex_unlock(&evlock);
|
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|
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if (g_timer_elapsed(timer, NULL) >= 5) {
|
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g_printerr("Event loop failed to quit after 5 seconds\n");
|
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}
|
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g_timer_destroy(timer);
|
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|
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for (i = 0; i < plan->nops; i++) {
|
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const QFileMonitorTestOp *op = &(plan->ops[i]);
|
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pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
|
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unlink(pathsrc);
|
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g_free(pathsrc);
|
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if (op->filedst) {
|
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pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
|
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unlink(pathdst);
|
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g_free(pathdst);
|
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}
|
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}
|
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|
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qemu_file_monitor_free(mon);
|
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g_list_foreach(data.records,
|
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(GFunc)qemu_file_monitor_test_record_free, NULL);
|
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g_list_free(data.records);
|
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qemu_mutex_destroy(&data.lock);
|
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if (dir) {
|
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rmdir(dir);
|
||||
}
|
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g_free(dir);
|
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g_assert(err == 0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Set of structs which define which file name patterns
|
||||
* we're trying to watch against. NULL, means all files
|
||||
* in the directory
|
||||
*/
|
||||
static const QFileMonitorTestWatch watches_any[] = {
|
||||
{ NULL },
|
||||
};
|
||||
|
||||
static const QFileMonitorTestWatch watches_one[] = {
|
||||
{ "one.txt" },
|
||||
};
|
||||
|
||||
static const QFileMonitorTestWatch watches_two[] = {
|
||||
{ "two.txt" },
|
||||
};
|
||||
|
||||
static const QFileMonitorTestWatch watches_many[] = {
|
||||
{ NULL },
|
||||
{ "one.txt" },
|
||||
{ "two.txt" },
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* Various sets of file operations we're going to
|
||||
* trigger and validate events for
|
||||
*/
|
||||
static const QFileMonitorTestOp ops_create_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", }
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_delete_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_UNLINK,
|
||||
.filesrc = "one.txt", }
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_create_many[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "two.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "three.txt", }
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_rename_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_RENAME,
|
||||
.filesrc = "one.txt", .filedst = "two.txt" }
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_rename_many[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "two.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_RENAME,
|
||||
.filesrc = "one.txt", .filedst = "two.txt" }
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_append_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_APPEND,
|
||||
.filesrc = "one.txt", },
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_trunc_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_TRUNC,
|
||||
.filesrc = "one.txt", },
|
||||
};
|
||||
|
||||
static const QFileMonitorTestOp ops_touch_one[] = {
|
||||
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
|
||||
.filesrc = "one.txt", },
|
||||
{ .type = QFILE_MONITOR_TEST_OP_TOUCH,
|
||||
.filesrc = "one.txt", },
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* No we define data sets for the combinatorial
|
||||
* expansion of file watches and operation sets
|
||||
*/
|
||||
#define PLAN_DATA(o, w) \
|
||||
static const QFileMonitorTestPlan plan_ ## o ## _ ## w = { \
|
||||
.nops = G_N_ELEMENTS(ops_ ##o), \
|
||||
.ops = ops_ ##o, \
|
||||
.nwatches = G_N_ELEMENTS(watches_ ##w), \
|
||||
.watches = watches_ ## w, \
|
||||
}
|
||||
|
||||
PLAN_DATA(create_one, any);
|
||||
PLAN_DATA(create_one, one);
|
||||
PLAN_DATA(create_one, two);
|
||||
PLAN_DATA(create_one, many);
|
||||
|
||||
PLAN_DATA(delete_one, any);
|
||||
PLAN_DATA(delete_one, one);
|
||||
PLAN_DATA(delete_one, two);
|
||||
PLAN_DATA(delete_one, many);
|
||||
|
||||
PLAN_DATA(create_many, any);
|
||||
PLAN_DATA(create_many, one);
|
||||
PLAN_DATA(create_many, two);
|
||||
PLAN_DATA(create_many, many);
|
||||
|
||||
PLAN_DATA(rename_one, any);
|
||||
PLAN_DATA(rename_one, one);
|
||||
PLAN_DATA(rename_one, two);
|
||||
PLAN_DATA(rename_one, many);
|
||||
|
||||
PLAN_DATA(rename_many, any);
|
||||
PLAN_DATA(rename_many, one);
|
||||
PLAN_DATA(rename_many, two);
|
||||
PLAN_DATA(rename_many, many);
|
||||
|
||||
PLAN_DATA(append_one, any);
|
||||
PLAN_DATA(append_one, one);
|
||||
PLAN_DATA(append_one, two);
|
||||
PLAN_DATA(append_one, many);
|
||||
|
||||
PLAN_DATA(trunc_one, any);
|
||||
PLAN_DATA(trunc_one, one);
|
||||
PLAN_DATA(trunc_one, two);
|
||||
PLAN_DATA(trunc_one, many);
|
||||
|
||||
PLAN_DATA(touch_one, any);
|
||||
PLAN_DATA(touch_one, one);
|
||||
PLAN_DATA(touch_one, two);
|
||||
PLAN_DATA(touch_one, many);
|
||||
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
g_test_init(&argc, &argv, NULL);
|
||||
|
||||
qemu_init_main_loop(&error_abort);
|
||||
|
||||
qemu_mutex_init(&evlock);
|
||||
|
||||
/*
|
||||
* Register test cases for the combinatorial
|
||||
* expansion of file watches and operation sets
|
||||
*/
|
||||
#define PLAN_REGISTER(o, w) \
|
||||
g_test_add_data_func("/util/filemonitor/" # o "/" # w, \
|
||||
&plan_ ## o ## _ ## w, test_file_monitor_events)
|
||||
|
||||
PLAN_REGISTER(create_one, any);
|
||||
PLAN_REGISTER(create_one, one);
|
||||
PLAN_REGISTER(create_one, two);
|
||||
PLAN_REGISTER(create_one, many);
|
||||
|
||||
PLAN_REGISTER(delete_one, any);
|
||||
PLAN_REGISTER(delete_one, one);
|
||||
PLAN_REGISTER(delete_one, two);
|
||||
PLAN_REGISTER(delete_one, many);
|
||||
|
||||
PLAN_REGISTER(create_many, any);
|
||||
PLAN_REGISTER(create_many, one);
|
||||
PLAN_REGISTER(create_many, two);
|
||||
PLAN_REGISTER(create_many, many);
|
||||
|
||||
PLAN_REGISTER(rename_one, any);
|
||||
PLAN_REGISTER(rename_one, one);
|
||||
PLAN_REGISTER(rename_one, two);
|
||||
PLAN_REGISTER(rename_one, many);
|
||||
|
||||
PLAN_REGISTER(rename_many, any);
|
||||
PLAN_REGISTER(rename_many, one);
|
||||
PLAN_REGISTER(rename_many, two);
|
||||
PLAN_REGISTER(rename_many, many);
|
||||
|
||||
PLAN_REGISTER(append_one, any);
|
||||
PLAN_REGISTER(append_one, one);
|
||||
PLAN_REGISTER(append_one, two);
|
||||
PLAN_REGISTER(append_one, many);
|
||||
|
||||
PLAN_REGISTER(trunc_one, any);
|
||||
PLAN_REGISTER(trunc_one, one);
|
||||
PLAN_REGISTER(trunc_one, two);
|
||||
PLAN_REGISTER(trunc_one, many);
|
||||
|
||||
PLAN_REGISTER(touch_one, any);
|
||||
PLAN_REGISTER(touch_one, one);
|
||||
PLAN_REGISTER(touch_one, two);
|
||||
PLAN_REGISTER(touch_one, many);
|
||||
|
||||
return g_test_run();
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue