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All of it can be found in the manual, which defines what the
code must do, and is always up to date unlike the code comments.
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Becoming closer to a standard supervisor everyday.
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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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Inspired by what supervisor does.
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Adds a transport connect method that takes a timeout, with implementations for both ssl and tcp connections.
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The implementation of elliptic-curve ciphers that has been introduced in
R16B01 is still incomplete (and broken). This makes our previous
workaround (see c0c09a1311) work for R16B02 as well.
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Exiting with reason `shutdown` or `{shutdown, term()}` is not an error.
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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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Unfortunately the implementation of elliptic-curve ciphers that has
been introduced in R16B01 is incomplete. Depending on the particular
client, this can cause the TLS handshake to break during key agreement.
As it turns out that most popular browsers (e.g. Firefox, Chromium,
and Safari) are affected by this bug, we provide this workaround.
This workaround makes sure that only cipher suite implementations that
are not known to be broken are supported by default.
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It can be called from other nodes too.
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Not everything stored in the process dictionary is a pid,
because we use proc_lib. Thanks to the cool spanish girl
at the EUC 2013 for highlighting this issue, and sorry
I forgot your name.
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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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This should be an acceptable temporary solution to the ssl_accept
problem. We no longer have to worry about acceptors being dead
because ssl_accept never returned.
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This should avoid using all CPU because we keep trying to accept.
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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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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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