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Don't use JobQueue during shutdown (RIPD-1356):

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If the JobQueue is used during shutdown then those Jobs may access
Stoppables after they have already stopped.  This violates the
preconditions of Stoppables and may lead to undefined behavior.

The solution taken here is to reference count all Jobs in the
JobQueue.  At stop time all Jobs already in the JobQueue are
allowed to run to completion, but no further Jobs are allowed
into the JobQueue.

If a Job is rejected from the JobQueue (because we are stopping),
then JobQueue::addJob() returns false, so the caller can make any
necessary adjustments.
This commit is contained in:
Scott Schurr
2017-04-06 17:39:42 -07:00
committed by seelabs
parent fc89d2e014
commit efe3700f70
29 changed files with 652 additions and 189 deletions
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28
src/ripple/rpc/impl/ServerHandlerImp.cpp
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@@ -309,11 +309,20 @@ ServerHandlerImp::onRequest (Session& session)
return;
}
m_jobQueue.postCoro(jtCLIENT, "RPC-Client",
[this, detach = session.detach()](std::shared_ptr<JobQueue::Coro> c)
std::shared_ptr<Session> detachedSession = session.detach();
auto const postResult = m_jobQueue.postCoro(jtCLIENT, "RPC-Client",
[this, detachedSession](std::shared_ptr<JobQueue::Coro> coro)
{
processSession(detach, c);
processSession(detachedSession, coro);
});
if (postResult == nullptr)
{
// The coroutine was rejected, probably because we're shutting down.
HTTPReply(503, "Service Unavailable",
makeOutput(*detachedSession), app_.journal("RPC"));
detachedSession->close(true);
return;
}
}
void
@@ -350,12 +359,12 @@ ServerHandlerImp::onWSMessage(
JLOG(m_journal.trace())
<< "Websocket received '" << jv << "'";
m_jobQueue.postCoro(jtCLIENT, "WS-Client",
[this, session = std::move(session),
jv = std::move(jv)](auto const& c)
auto const postResult = m_jobQueue.postCoro(jtCLIENT, "WS-Client",
[this, session, jv = std::move(jv)]
(std::shared_ptr<JobQueue::Coro> const& coro)
{
auto const jr =
this->processSession(session, c, jv);
this->processSession(session, coro, jv);
auto const s = to_string(jr);
auto const n = s.length();
beast::multi_buffer sb(n);
@@ -365,6 +374,11 @@ ServerHandlerImp::onWSMessage(
StreambufWSMsg<decltype(sb)>>(std::move(sb)));
session->complete();
});
if (postResult == nullptr)
{
// The coroutine was rejected, probably because we're shutting down.
session->close();
}
}
void