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This change was designed so that we don't have this supervisor
and ranch_listener performing the same job, namely monitoring
connection processes, the first through links and the second
through monitors.
This change also makes possible various optimizations:
* Acceptors don't need to know about options, maximum number
of connections, or anything else. They can just accept,
pass the socket to the supervisor, and when the supervisor
replies continue accepting connections.
* The supervisor holds most of the information that will be
passed to created processes. This reduces copying.
* The supervisor temporarily takes ownership of the socket,
then creates the connection process and gives it ownership,
streamlining the creation.
* The supervisor can hold acceptors in their receive loop if
max_connections is reached. When this number gets below the
limit it can then send a message to a sleeping acceptor to
make it resume its operations.
* Because we know that all connection process creations are made
from the local Erlang node, we can greatly reduce the number
operations to be made when calling the supervisor.
* Because all acceptors die if this supervisor dies, we can
remove even more operations from the calling code. We do not
need to monitor or wait for a timeout. This reduces the call
code to two statements: send and receive. (Thanks James Fish
for helping with that.)
* The supervisor only needs to keep track of a list of pids.
There is no children specification to be maintained, we do
not need to handle restart strategy (no process can be
restarted because the socket dies with it). We are using
the process dictionary for storing the pids as it proved
to be the simplest and fastest solution.
* The supervisor maintains a count of current connections,
but also of processes (including the ones that removed
themselves from the pool), making any query of these values
very fast.
The supervisor should still be compatible with OTP principles.
It responds to calls from the supervisor module as expected,
although some of them are disabled and an error will be returned,
for example supervisor:start_child/2. It is also started with
proc_lib and handles system messages. sys:get_status/1 can thus
be used as expected.
We can see a great increase in the number of requests/s, a great
improvement in the latency of requests, and we can simply accept
requests faster than before. It will probably have a bigger increase
under virtualized environments, although that's only a guess.
As a result of this, we don't write much anymore in the ranch_server
ets table, so the write_concurrency option was removed. Tests were
also slightly improved to prevent race conditions.
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For TLS Next Protocol Negotiation support.
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All is done in the Makefile, like with Cowboy.
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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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This patch lets the user set and use raw socket options as described in
inet:setopts/2 documentation.
The raw options can be useful to use TCP features that are platform-
specific and not supported in inet in general, such as TCP_DEFER_ACCEPT
or TCP_LINGER2 in linux stacks, for example.
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It is non_neg_integer() | infinity. Introduce the type
`ranch:max_conns/0` for easier manipulation.
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Concerning supervisor tests subtle issue. Before we just presumed that last
port in the global list of ports is the listening socket. From now we trace
the return value of the `ranch_tcp:listen` call.
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Tests were constantly failing without this patch. It seems ct
starts erlang code server in interactive mode, so application
module loading is defered.
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Two general issues were addressed. The first one is the issue with
statically defined pids passed into childspecs. This issue prevents
regular supervisor' children restarts in the case of someone's
failure.
The second one is the not quite appropriate restart strategy.
Changed to rest_for_one which in pair with previous fixes assures
that live connections will not die in the case of partial failure.
Among possible failures are listening socket shutdown or frequent
accept errors.
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Making people happy one IRC channel at a time.
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Uses file:sendfile/2 for TCP, a fallback function for SSL.
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Enabled by default.
A comprehensive explanation about TCP_NODELAY and the Nagle algorithm
can be found at http://www.stuartcheshire.org/papers/NagleDelayedAck/
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At the same time we make the 'port' option optional, defaulting to 0.
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