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There is no need to contact the server and track requests unless being
asked to do so by the user. It's going to be faster and more efficient
to not track anything when being told tracking doesn't matter.
Whenever the max connections is set to infinity, the connections
counting key is not created, or is deleted if it existed already.
When using a numeric value, the connection count is created or
maintained if it existed already.
Moreover, trying to reduce a listener's counter while the max connection
number is set to `infinity` will return 0 and avoid all counting
operations as they are meaningless.
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It is non_neg_integer() | infinity. Introduce the type
`ranch:max_conns/0` for easier manipulation.
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Distinguish the errors from transport_accept and ssl_accept
in ranch_ssl. {error, closed} for the first one means the listening
socket got closed; for the second one it means the connection
socket was.
Ignore all errors except when the listening socket got closed,
where we want to crash to allow opening the socket again.
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Ranch now accepts connection asynchronously through a separate
process. The accept process is linked to the acceptor, calls
accept and does nothing else but send the socket back to the
acceptor. This allows us to receive messages in the acceptor
to handle upgrades instead of polling. This will also allow us
later to make acceptors system processes.
Remove support for connection pools in favor of a simpler
max_connections setting. Connections can be removed from the
count, allowing us to have as many long-lived connections as
we want while still limiting the number of short-lived ones.
Add max_connections, max_connections with long-lived connections,
and upgrade tests.
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This way, if a crash happens in one of them after a protocol options
upgrade has occured, the restarted acceptor will get the upgraded
options as expected, and not the initial ones.
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Also use one export per line to improve future diffs.
Bump the version to 0.2.1 to reflect this change.
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Modules were renamed. The 'cowboy_' prefix became 'ranch_'.
At the same time, ranch_ssl_transport became ranch_ssl,
and ranch_tcp_transport became ranch_tcp, because appending
'_transport' felt a bit redundant considering SSL and TCP
clearly are transports.
One test has been added to make sure everything is working.
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