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This allows graceful draining of connections, updating transport
options on a running listener without having to drop connections
and other similar scenarios.
Note that when updating transport options the listener must be
suspended which means that new connections will be rejected until
the listener is resumed.
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Windows apparently does not have privileged ports, anyone
can open sockets on ports < 1024.
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The NumAcceptors argument has been moved to transport option
num_acceptor, which defaults to 10. The functions now take
one less argument. The old functions are still here, though
deprecated.
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Amended with small whitespace changes and removing an unused clause.
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Otherwise gen_tcp doesn't have enough time to connect.
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Provides detailed information about Ranch listeners
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Simplify some return values, improve error messages for
eaddrinuse and no_cert.
Amended to add tests and simpler code. Also hides the
contents of cert and key transport options, if any.
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Cert/certfile is no longer required if SNI options are provided.
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They are now properly documented and the listener name is
automatically specified thanks to a new ct_helper function.
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Merging because I have to do other work but this is still a
nice enough improvement.
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Order of options in listen is undocumented but significant. Now user option will
replace default value if user set it.
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Implements the `shutdown` option as documented previously.
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Doing this in the connection process allows us to free acceptors
to start accepting more connections quicker, especially under load.
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Adds offset based sendfile to transports. Same behaviour as
file:sendfile/4,/5 except socket and file arguments are reversed and
either a raw file or a filename can be used.
sendfile/2,/4,/5 now compulsory callbacks in ranch_transport.
ranch_tcp:sendfile/2 now defaults to a chunk_size of 8191 - the default
for ranch_ssl:sendfile/2. The same default is used for both
ranch_tcp:sendfile/4,5 and ranch_ssl:sendfile/4,5.
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The Erlang SSL library allows keys, certs and cacerts to be passed either as DER encoded binaries or in PEM encoded files. This patch allows ranch_ssl to be configured in either manner.
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A ranch_conns_sup could be (re)started and call
ranch_server:set_connections_sup/2 before ranch_server has handled the
predecessor's exit. This would cause the ranch_server to crash because
ets:insert_new/2 would return false.
This change allows ranch_server to handle this case by crashing the
calling process instead of itself.
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When ranch_server crashes it will now remonitor previously registered
ranch_conns_sup processes so they can be removed from the registry when
they die.
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This is a regression test to prevent a previous bug.
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We just don't need this process anymore. Less, simpler code!
API changes:
* Protocols start_link first argument is now Ref instead of ListenerPid
* ranch:accept_ack/1 argument is now Ref instead of ListenerPid
* ranch_listener:remove_connection/1 becomes ranch:remove_connection/1
and its argument is now Ref instead of ListenerPid
Ref is the name of the listener given as first argument to start_listener/6.
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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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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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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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