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modules/client/sync: Fix/improve longpoll behavior as a fallback.

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This commit is contained in:
Jason Volk 2019-07-09 19:21:00 -07:00
parent 62ede2f954
commit 975e3d8700
1 changed files with 35 additions and 16 deletions
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51
modules/client/sync.cc
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@ -298,6 +298,12 @@ ircd::m::sync::handle_get(client &client,
range.second - range.first <= size_t(linear_delta_max)
};
// Logical convenience boolean
const bool should_polylog
{
!should_longpoll && !should_linear
};
// Determine if an empty sync response should be returned to the user.
// This is done by actually performing the sync operation based on the
// mode decided. The return value from the operation will be false if
@ -305,16 +311,19 @@ ircd::m::sync::handle_get(client &client,
// finally send an empty response.
const bool complete
{
should_longpoll?
longpoll_handle(data):
should_linear?
linear_handle(data):
polylog_handle(data)
should_polylog?
polylog_handle(data):
false
};
if(complete)
return response;
if(longpoll_handle(data))
return response;
const auto &next_batch
{
polylog_only?
@ -576,11 +585,12 @@ try
log::debug
{
log, "request %s linear last:%lu %s@%lu",
log, "request %s linear last:%lu %s@%lu events:%zu",
loghead(data),
last,
completed? "complete "_sv : string_view{},
next
next,
vector.size(),
};
return last;
@ -752,7 +762,19 @@ ircd::m::sync::longpoll_handle(data &data)
try
{
int ret;
for(ret = -1; ret == -1; ret = longpoll::poll(data));
while((ret = longpoll::poll(data)) == -1)
{
// When the client explicitly gives a next_batch token we have to
// adhere to it and return an empty response before going past their
// desired upper-bound for this /sync.
if(data.args->next_batch_token)
if(data.range.first >= data.range.second || data.range.second >= vm::sequence::retired)
return false;
++data.range.second;
assert(data.range.first <= data.range.second);
}
return ret;
}
catch(const std::system_error &e)
@ -803,9 +825,14 @@ catch(const std::exception &e)
int
ircd::m::sync::longpoll::poll(data &data)
{
const auto ready{[&data]
{
assert(data.range.second <= m::vm::sequence::retired + 1);
return data.range.second <= m::vm::sequence::retired;
}};
assert(data.args);
if(!dock.wait_until(data.args->timesout))
if(!dock.wait_until(data.args->timesout, ready))
return false;
// Check if client went away while we were sleeping,
@ -824,14 +851,6 @@ ircd::m::sync::longpoll::poll(data &data)
if(polled(data, *data.args))
return true;
// When the client explicitly gives a next_batch token we have to
// adhere to it and return an empty response before going past.
if(data.args->next_batch_token && m::vm::sequence::retired >= data.range.second)
return false;
if(data.range.second <= m::vm::sequence::retired)
++data.range.second;
return -1;
}
@ -892,7 +911,7 @@ ircd::m::sync::longpoll::polled(data &data,
{
data.event_idx?
std::min(data.event_idx + 1, vm::sequence::retired + 1):
data.range.first
std::min(data.range.second + 1, vm::sequence::retired + 1)
};
json::stack::member