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http: Abort with clear error instead of hanging forever

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Could happen when connection doesn't complete for some reason.

Output early warning to give clue about what's up.

Prior check+log message before even starting to wait was a bit too eager to hint at something being wrong.
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Hodlinator 2025-02-21 14:58:29 +01:00
parent 757de96db5
commit a00dfd2046
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1 changed files with 14 additions and 6 deletions
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20
src/httpserver.cpp
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@ -197,10 +197,10 @@ public:
return WITH_LOCK(m_mutex, return m_tracker.size());
}
//! Wait until there are no more connections with active requests in the tracker
void WaitUntilEmpty() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
void WaitUntilEmpty(std::chrono::seconds timeout) const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
WAIT_LOCK(m_mutex, lock);
m_cv.wait(lock, [this]() EXCLUSIVE_LOCKS_REQUIRED(m_mutex) { return m_tracker.empty(); });
m_cv.wait_for(lock, timeout, [this]() EXCLUSIVE_LOCKS_REQUIRED(m_mutex) { return m_tracker.empty(); });
}
};
//! Track active requests
@ -536,11 +536,19 @@ void StopHTTPServer()
evhttp_del_accept_socket(eventHTTP, socket);
}
boundSockets.clear();
{
if (const auto n_connections{g_requests.CountActiveConnections()}; n_connections != 0) {
LogDebug(BCLog::HTTP, "Waiting for %d connections to stop HTTP server\n", n_connections);
// Give clients time to close down TCP connections from their side before we
// free eventHTTP, this avoids issues like RemoteDisconnected exceptions in
// the test framework.
g_requests.WaitUntilEmpty(/*timeout=*/30s);
if (auto connections{g_requests.CountActiveConnections()}) {
LogWarning("%d remaining HTTP connection(s) after 30s timeout, waiting for longer.", connections);
g_requests.WaitUntilEmpty(/*timeout=*/10min);
if ((connections = g_requests.CountActiveConnections())) {
LogError("%d remaining HTTP connection(s) after long timeout. "
"Aborting to avoid potential use-after-frees from "
"connections still running after freeing eventHTTP.", connections);
std::abort();
}
g_requests.WaitUntilEmpty();
}
if (eventHTTP) {
// Schedule a callback to call evhttp_free in the event base thread, as