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Comments (2)

danielzhanghl avatar danielzhanghl commented on July 25, 2024

after some dig into the code, it seems the watch can not be cancelled, that is a bug.

from etcd-cpp-apiv3.

sighingnow avatar sighingnow commented on July 25, 2024

Hi @danielzhanghl,

You could find sync-watch examples in

etcd-cpp-apiv3/tst/EtcdSyncTest.cpp

Lines 111 to 179 in a00a06d

TEST_CASE("wait for a value change")
{
etcd::SyncClient etcd(etcd_uri);
etcd.set("/test/key1", "42");
std::thread watch_thrd([&]() {
etcd::Response res = etcd.watch("/test/key1");
REQUIRE("set" == res.action());
CHECK("43" == res.value().as_string());
});
sleep(1);
etcd.set("/test/key1", "43");
watch_thrd.join();
REQUIRE(0 == etcd.rmdir("/test", true).error_code());
}
TEST_CASE("wait for a directory change")
{
etcd::SyncClient etcd(etcd_uri);
std::thread watch_thrd1([&]() {
etcd::Response res = etcd.watch("/test", true);
CHECK("create" == res.action());
CHECK("44" == res.value().as_string());
});
sleep(1);
etcd.add("/test/key4", "44");
watch_thrd1.join();
std::thread watch_thrd2([&]() {
etcd::Response res2 = etcd.watch("/test", true);
CHECK("set" == res2.action());
CHECK("45" == res2.value().as_string());
});
sleep(1);
etcd.set("/test/key4", "45");
watch_thrd2.join();
REQUIRE(0 == etcd.rmdir("/test", true).error_code());
}
TEST_CASE("watch changes in the past")
{
etcd::SyncClient etcd(etcd_uri);
int index = etcd.set("/test/key1", "42").index();
etcd.set("/test/key1", "43");
etcd.set("/test/key1", "44");
etcd.set("/test/key1", "45");
etcd::Response res = etcd.watch("/test/key1", ++index);
CHECK("set" == res.action());
CHECK("43" == res.value().as_string());
res = etcd.watch("/test/key1", ++index);
CHECK("set" == res.action());
CHECK("44" == res.value().as_string());
res = etcd.watch("/test", ++index, true);
CHECK("set" == res.action());
CHECK("45" == res.value().as_string());
REQUIRE(0 == etcd.rmdir("/test", true).error_code());
}
.

from etcd-cpp-apiv3.

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