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qemu/tests/test-util-filemonitor.c
Daniel P. Berrangé 90e33dfec6 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>
2019-02-26 15:25:58 +00:00

686 lines
19 KiB
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/*
* Tests for util/filemonitor-*.c
*
* Copyright 2018 Red Hat, Inc.
*
* 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
* (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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "qapi/error.h"
#include "qemu/filemonitor.h"
#include <utime.h>
enum {
QFILE_MONITOR_TEST_OP_CREATE,
QFILE_MONITOR_TEST_OP_APPEND,
QFILE_MONITOR_TEST_OP_TRUNC,
QFILE_MONITOR_TEST_OP_RENAME,
QFILE_MONITOR_TEST_OP_TOUCH,
QFILE_MONITOR_TEST_OP_UNLINK,
};
typedef struct {
int type;
const char *filesrc;
const char *filedst;
} QFileMonitorTestOp;
typedef struct {
const char *file;
} QFileMonitorTestWatch;
typedef struct {
gsize nwatches;
const QFileMonitorTestWatch *watches;
gsize nops;
const QFileMonitorTestOp *ops;
} QFileMonitorTestPlan;
typedef struct {
int id;
QFileMonitorEvent event;
char *filename;
} QFileMonitorTestRecord;
typedef struct {
QemuMutex lock;
GList *records;
} QFileMonitorTestData;
static QemuMutex evlock;
static bool evstopping;
static bool evrunning;
/*
* Main function for a background thread that is
* running the event loop during the test
*/
static void *
qemu_file_monitor_test_event_loop(void *opaque G_GNUC_UNUSED)
{
qemu_mutex_lock(&evlock);
while (!evstopping) {
qemu_mutex_unlock(&evlock);
main_loop_wait(true);
qemu_mutex_lock(&evlock);
}
evrunning = false;
qemu_mutex_unlock(&evlock);
return NULL;
}
/*
* File monitor event handler which simply maintains
* an ordered list of all events that it receives
*/
static void
qemu_file_monitor_test_handler(int id,
QFileMonitorEvent event,
const char *filename,
void *opaque)
{
QFileMonitorTestData *data = opaque;
QFileMonitorTestRecord *rec = g_new0(QFileMonitorTestRecord, 1);
rec->id = id;
rec->event = event;
rec->filename = g_strdup(filename);
qemu_mutex_lock(&data->lock);
data->records = g_list_append(data->records, rec);
qemu_mutex_unlock(&data->lock);
}
static void
qemu_file_monitor_test_record_free(QFileMonitorTestRecord *rec)
{
g_free(rec->filename);
g_free(rec);
}
/*
* Get the next event record that has been received by
* the file monitor event handler. Since events are
* emitted in the background thread running the event
* loop, we can't assume there is a record available
* immediately. Thus we will sleep for upto 5 seconds
* to wait for the event to be queued for us.
*/
static QFileMonitorTestRecord *
qemu_file_monitor_test_next_record(QFileMonitorTestData *data)
{
GTimer *timer = g_timer_new();
QFileMonitorTestRecord *record = NULL;
GList *tmp;
qemu_mutex_lock(&data->lock);
while (!data->records && g_timer_elapsed(timer, NULL) < 5) {
qemu_mutex_unlock(&data->lock);
usleep(10 * 1000);
qemu_mutex_lock(&data->lock);
}
if (data->records) {
record = data->records->data;
tmp = data->records;
data->records = g_list_remove_link(data->records, tmp);
g_list_free(tmp);
}
qemu_mutex_unlock(&data->lock);
g_timer_destroy(timer);
return record;
}
/*
* Check whether the event record we retrieved matches
* data we were expecting to see for the event
*/
static bool
qemu_file_monitor_test_expect(QFileMonitorTestData *data,
int id,
QFileMonitorEvent event,
const char *filename)
{
QFileMonitorTestRecord *rec;
bool ret = false;
rec = qemu_file_monitor_test_next_record(data);
if (!rec) {
g_printerr("Missing event watch id %d event %d file %s\n",
id, event, filename);
return false;
}
if (id != rec->id) {
g_printerr("Expected watch id %d but got %d\n", id, rec->id);
goto cleanup;
}
if (event != rec->event) {
g_printerr("Expected event %d but got %d\n", event, rec->event);
goto cleanup;
}
if (!g_str_equal(filename, rec->filename)) {
g_printerr("Expected filename %s but got %s\n",
filename, rec->filename);
goto cleanup;
}
ret = true;
cleanup:
qemu_file_monitor_test_record_free(rec);
return ret;
}
static void
test_file_monitor_events(const void *opaque)
{
const QFileMonitorTestPlan *plan = opaque;
Error *local_err = NULL;
GError *gerr = NULL;
QFileMonitor *mon = qemu_file_monitor_new(&local_err);
QemuThread th;
GTimer *timer;
gchar *dir = NULL;
int err = -1;
gsize i, j;
char *pathsrc = NULL;
char *pathdst = NULL;
QFileMonitorTestData data;
qemu_mutex_init(&data.lock);
data.records = NULL;
/*
* The file monitor needs the main loop running in
* order to receive events from inotify. We must
* thus spawn a background thread to run an event
* loop impl, while this thread triggers the
* actual file operations we're testing
*/
evrunning = 1;
evstopping = 0;
qemu_thread_create(&th, "event-loop",
qemu_file_monitor_test_event_loop, NULL,
QEMU_THREAD_JOINABLE);
if (local_err) {
g_printerr("File monitoring not available: %s",
error_get_pretty(local_err));
error_free(local_err);
return;
}
dir = g_dir_make_tmp("test-util-filemonitor-XXXXXX",
&gerr);
if (!dir) {
g_printerr("Unable to create tmp dir %s",
gerr->message);
g_error_free(gerr);
abort();
}
/*
* First register all the directory / file watches
* we're interested in seeing events against
*/
for (i = 0; i < plan->nwatches; i++) {
int watchid;
watchid = qemu_file_monitor_add_watch(mon,
dir,
plan->watches[i].file,
qemu_file_monitor_test_handler,
&data,
&local_err);
if (watchid < 0) {
g_printerr("Unable to add watch %s",
error_get_pretty(local_err));
goto cleanup;
}
}
/*
* Now invoke all the file operations (create,
* delete, rename, chmod, etc). These operations
* will trigger the various file monitor events
*/
for (i = 0; i < plan->nops; i++) {
const QFileMonitorTestOp *op = &(plan->ops[i]);
int fd;
struct utimbuf ubuf;
pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
if (op->filedst) {
pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
}
switch (op->type) {
case QFILE_MONITOR_TEST_OP_CREATE:
fd = open(pathsrc, O_WRONLY | O_CREAT, 0700);
if (fd < 0) {
g_printerr("Unable to create %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
close(fd);
break;
case QFILE_MONITOR_TEST_OP_APPEND:
fd = open(pathsrc, O_WRONLY | O_APPEND, 0700);
if (fd < 0) {
g_printerr("Unable to open %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
if (write(fd, "Hello World", 10) != 10) {
g_printerr("Unable to write %s: %s",
pathsrc, strerror(errno));
close(fd);
goto cleanup;
}
close(fd);
break;
case QFILE_MONITOR_TEST_OP_TRUNC:
if (truncate(pathsrc, 4) < 0) {
g_printerr("Unable to truncate %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_RENAME:
if (rename(pathsrc, pathdst) < 0) {
g_printerr("Unable to rename %s to %s: %s",
pathsrc, pathdst, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_UNLINK:
if (unlink(pathsrc) < 0) {
g_printerr("Unable to unlink %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_TOUCH:
ubuf.actime = 1024;
ubuf.modtime = 1025;
if (utime(pathsrc, &ubuf) < 0) {
g_printerr("Unable to touch %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
default:
g_assert_not_reached();
}
g_free(pathsrc);
g_free(pathdst);
pathsrc = pathdst = NULL;
}
/*
* Finally validate that we have received all the events
* we expect to see for the combination of watches and
* file operations
*/
for (i = 0; i < plan->nops; i++) {
const QFileMonitorTestOp *op = &(plan->ops[i]);
switch (op->type) {
case QFILE_MONITOR_TEST_OP_CREATE:
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filesrc))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_CREATED, op->filesrc))
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_APPEND:
case QFILE_MONITOR_TEST_OP_TRUNC:
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filesrc))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_MODIFIED, op->filesrc))
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_RENAME:
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filesrc))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
goto cleanup;
}
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filedst))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_CREATED, op->filedst))
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_TOUCH:
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filesrc))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_ATTRIBUTES, op->filesrc))
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_UNLINK:
for (j = 0; j < plan->nwatches; j++) {
if (plan->watches[j].file &&
!g_str_equal(plan->watches[j].file, op->filesrc))
continue;
if (!qemu_file_monitor_test_expect(
&data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
goto cleanup;
}
break;
default:
g_assert_not_reached();
}
}
err = 0;
cleanup:
g_free(pathsrc);
g_free(pathdst);
qemu_mutex_lock(&evlock);
evstopping = 1;
timer = g_timer_new();
while (evrunning && g_timer_elapsed(timer, NULL) < 5) {
qemu_mutex_unlock(&evlock);
usleep(10 * 1000);
qemu_mutex_lock(&evlock);
}
qemu_mutex_unlock(&evlock);
if (g_timer_elapsed(timer, NULL) >= 5) {
g_printerr("Event loop failed to quit after 5 seconds\n");
}
g_timer_destroy(timer);
for (i = 0; i < plan->nops; i++) {
const QFileMonitorTestOp *op = &(plan->ops[i]);
pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
unlink(pathsrc);
g_free(pathsrc);
if (op->filedst) {
pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
unlink(pathdst);
g_free(pathdst);
}
}
qemu_file_monitor_free(mon);
g_list_foreach(data.records,
(GFunc)qemu_file_monitor_test_record_free, NULL);
g_list_free(data.records);
qemu_mutex_destroy(&data.lock);
if (dir) {
rmdir(dir);
}
g_free(dir);
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();
}
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