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Turn hydra-notify into a daemon

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It now receives notifications about started/finished builds/steps via
PostgreSQL. This gets rid of the (substantial) overhead of starting
hydra-notify for every event. It also allows other programs (even on
other machines) to listen to Hydra notifications.
This commit is contained in:
Eelco Dolstra
2019-08-09 19:11:38 +02:00
parent f13a2cb6dc
commit 2946899504
5 changed files with 105 additions and 174 deletions
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30
src/hydra-queue-runner/builder.cc
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@ -99,6 +99,8 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
unsigned int maxSilentTime, buildTimeout;
unsigned int repeats = step->isDeterministic ? 1 : 0;
auto conn(dbPool.get());
{
std::set<Build::ptr> dependents;
std::set<Step::ptr> steps;
@ -122,8 +124,10 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
for (auto build2 : dependents) {
if (build2->drvPath == step->drvPath) {
build = build2;
enqueueNotificationItem({NotificationItem::Type::BuildStarted, build->id});
build = build2;
pqxx::work txn(*conn);
notifyBuildStarted(txn, build->id);
txn.commit();
}
{
auto i = jobsetRepeats.find(std::make_pair(build2->projectName, build2->jobsetName));
@ -144,8 +148,6 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
bool quit = buildId == buildOne && step->drvPath == buildDrvPath;
auto conn(dbPool.get());
RemoteResult result;
BuildOutput res;
unsigned int stepNr = 0;
@ -170,11 +172,6 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
} catch (...) {
ignoreException();
}
/* Asynchronously run plugins. FIXME: if we're killed,
plugin actions might not be run. Need to ensure
at-least-once semantics. */
enqueueNotificationItem({NotificationItem::Type::StepFinished, buildId, {}, stepNr, result.logFile});
}
});
@ -342,8 +339,12 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
/* Send notification about the builds that have this step as
the top-level. */
for (auto id : buildIDs)
enqueueNotificationItem({NotificationItem::Type::BuildFinished, id});
{
pqxx::work txn(*conn);
for (auto id : buildIDs)
notifyBuildFinished(txn, id, {});
txn.commit();
}
/* Wake up any dependent steps that have no other
dependencies. */
@ -462,11 +463,10 @@ State::StepResult State::doBuildStep(nix::ref<Store> destStore,
/* Send notification about this build and its dependents. */
{
auto notificationSenderQueue_(notificationSenderQueue.lock());
notificationSenderQueue_->push(NotificationItem{NotificationItem::Type::BuildFinished, buildId, dependentIDs});
pqxx::work txn(*conn);
notifyBuildFinished(txn, buildId, dependentIDs);
txn.commit();
}
notificationSenderWakeup.notify_one();
}
// FIXME: keep stats about aborted steps?

104
src/hydra-queue-runner/hydra-queue-runner.cc
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@ -299,6 +299,9 @@ void State::finishBuildStep(pqxx::work & txn, const RemoteResult & result,
(result.timesBuilt, result.timesBuilt > 0)
(result.isNonDeterministic, result.timesBuilt > 1)
.exec();
assert(result.logFile.find('\'') == std::string::npos);
txn.exec(fmt("notify step_finished, '%d %d %s'", buildId, stepNr,
result.logFile.empty() ? "-" : result.logFile));
}
@ -450,74 +453,20 @@ bool State::checkCachedFailure(Step::ptr step, Connection & conn)
}
void State::notificationSender()
void State::notifyBuildStarted(pqxx::work & txn, BuildID buildId)
{
while (true) {
try {
txn.exec(fmt("notify build_started, '%s'", buildId));
}
NotificationItem item;
{
auto notificationSenderQueue_(notificationSenderQueue.lock());
while (notificationSenderQueue_->empty())
notificationSenderQueue_.wait(notificationSenderWakeup);
item = notificationSenderQueue_->front();
notificationSenderQueue_->pop();
}
MaintainCount<counter> mc(nrNotificationsInProgress);
printMsg(lvlChatty, format("sending notification about build %1%") % item.id);
auto now1 = std::chrono::steady_clock::now();
Pid pid = startProcess([&]() {
Strings argv;
switch (item.type) {
case NotificationItem::Type::BuildStarted:
argv = {"hydra-notify", "build-started", std::to_string(item.id)};
for (auto id : item.dependentIds)
argv.push_back(std::to_string(id));
break;
case NotificationItem::Type::BuildFinished:
argv = {"hydra-notify", "build-finished", std::to_string(item.id)};
for (auto id : item.dependentIds)
argv.push_back(std::to_string(id));
break;
case NotificationItem::Type::StepFinished:
argv = {"hydra-notify", "step-finished", std::to_string(item.id), std::to_string(item.stepNr), item.logPath};
break;
};
printMsg(lvlChatty, "Executing hydra-notify " + concatStringsSep(" ", argv));
execvp("hydra-notify", (char * *) stringsToCharPtrs(argv).data()); // FIXME: remove cast
throw SysError("cannot start hydra-notify");
});
int res = pid.wait();
if (!statusOk(res))
throw Error("notification about build %d failed: %s", item.id, statusToString(res));
auto now2 = std::chrono::steady_clock::now();
if (item.type == NotificationItem::Type::BuildFinished) {
auto conn(dbPool.get());
pqxx::work txn(*conn);
txn.parameterized
("update Builds set notificationPendingSince = null where id = $1")
(item.id)
.exec();
txn.commit();
}
nrNotificationTimeMs += std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
nrNotificationsDone++;
} catch (std::exception & e) {
nrNotificationsFailed++;
printMsg(lvlError, format("notification sender: %1%") % e.what());
sleep(5);
}
}
void State::notifyBuildFinished(pqxx::work & txn, BuildID buildId,
const std::vector<BuildID> & dependentIds)
{
auto payload = fmt("%d ", buildId);
for (auto & d : dependentIds)
payload += fmt("%d ", d);
// FIXME: apparently parameterized() doesn't support NOTIFY.
txn.exec(fmt("notify build_finished, '%s'", payload));
}
@ -589,13 +538,6 @@ void State::dumpStatus(Connection & conn, bool log)
root.attr("nrDbConnections", dbPool.count());
root.attr("nrActiveDbUpdates", nrActiveDbUpdates);
root.attr("memoryTokensInUse", memoryTokens.currentUse());
root.attr("nrNotificationsDone", nrNotificationsDone);
root.attr("nrNotificationsFailed", nrNotificationsFailed);
root.attr("nrNotificationsInProgress", nrNotificationsInProgress);
root.attr("nrNotificationsPending", notificationSenderQueue.lock()->size());
root.attr("nrNotificationTimeMs", nrNotificationTimeMs);
uint64_t nrNotificationsTotal = nrNotificationsDone + nrNotificationsFailed;
root.attr("nrNotificationTimeAvgMs", nrNotificationsTotal == 0 ? 0.0 : (float) nrNotificationTimeMs / nrNotificationsTotal);
{
auto nested = root.object("machines");
@ -843,24 +785,6 @@ void State::run(BuildID buildOne)
std::thread(&State::dispatcher, this).detach();
/* Idem for notification sending. */
auto maxConcurrentNotifications = config->getIntOption("max-concurrent-notifications", 2);
for (uint64_t i = 0; i < maxConcurrentNotifications; ++i)
std::thread(&State::notificationSender, this).detach();
/* Enqueue notification items for builds that were finished
previously, but for which we didn't manage to send
notifications. */
{
auto conn(dbPool.get());
pqxx::work txn(*conn);
auto res = txn.parameterized("select id from Builds where notificationPendingSince > 0").exec();
for (auto const & row : res) {
auto id = row["id"].as<BuildID>();
enqueueNotificationItem({NotificationItem::Type::BuildFinished, id});
}
}
/* Periodically clean up orphaned busy steps in the database. */
std::thread([&]() {
while (true) {

6
src/hydra-queue-runner/queue-monitor.cc
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@ -193,13 +193,12 @@ bool State::getQueuedBuilds(Connection & conn,
(build->id)
((int) (ex.step->drvPath == build->drvPath ? bsFailed : bsDepFailed))
(time(0)).exec();
notifyBuildFinished(txn, build->id, {});
txn.commit();
build->finishedInDB = true;
nrBuildsDone++;
}
enqueueNotificationItem({NotificationItem::Type::BuildFinished, build->id});
return;
}
@ -230,13 +229,12 @@ bool State::getQueuedBuilds(Connection & conn,
time_t now = time(0);
printMsg(lvlInfo, format("marking build %1% as succeeded (cached)") % build->id);
markSucceededBuild(txn, build, res, true, now, now);
notifyBuildFinished(txn, build->id, {});
txn.commit();
}
build->finishedInDB = true;
enqueueNotificationItem({NotificationItem::Type::BuildFinished, build->id});
return;
}

40
src/hydra-queue-runner/state.hh
View File

@ -347,39 +347,6 @@ private:
counter bytesSent{0};
counter bytesReceived{0};
counter nrActiveDbUpdates{0};
counter nrNotificationsDone{0};
counter nrNotificationsFailed{0};
counter nrNotificationsInProgress{0};
counter nrNotificationTimeMs{0};
/* Notification sender work queue. FIXME: if hydra-queue-runner is
killed before it has finished sending notifications about a
build, then the notifications may be lost. It would be better
to mark builds with pending notification in the database. */
struct NotificationItem
{
enum class Type : char {
BuildStarted,
BuildFinished,
StepFinished,
};
Type type;
BuildID id;
std::vector<BuildID> dependentIds;
unsigned int stepNr;
nix::Path logPath;
};
nix::Sync<std::queue<NotificationItem>> notificationSenderQueue;
std::condition_variable notificationSenderWakeup;
void enqueueNotificationItem(const NotificationItem && item)
{
{
auto notificationSenderQueue_(notificationSenderQueue.lock());
notificationSenderQueue_->emplace(item);
}
notificationSenderWakeup.notify_one();
}
/* Specific build to do for --build-one (testing only). */
BuildID buildOne;
@ -540,9 +507,10 @@ private:
bool checkCachedFailure(Step::ptr step, Connection & conn);
/* Thread that asynchronously invokes hydra-notify to send build
notifications. */
void notificationSender();
void notifyBuildStarted(pqxx::work & txn, BuildID buildId);
void notifyBuildFinished(pqxx::work & txn, BuildID buildId,
const std::vector<BuildID> & dependentIds);
/* Acquire the global queue runner lock, or null if somebody else
has it. */