1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
ranch
=====
The `ranch` module provides functions for starting and
manipulating Ranch listeners.
Types
-----
### max_conns() = non_neg_integer() | infinity
> Maximum number of connections allowed on this listener.
>
> This is a soft limit. The actual number of connections
> might be slightly above the limit due to concurrency
> when accepting new connections. Some connections may
> also be removed from this count explicitly by the user
> code.
### ref() = any()
> Unique name used to refer to a listener.
Exports
-------
### accept_ack(Ref) -> ok
> Types:
> * Ref = ref()
>
> Acknowledge that the connection is accepted.
>
> This function MUST be used by a connection process to inform
> Ranch that it initialized properly and let it perform any
> additional operations before the socket can be safely used.
### child_spec(Ref, NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
-> supervisor:child_spec()
> Types:
> * Ref = ref()
> * NbAcceptors = non_neg_integer()
> * Transport = module()
> * TransOpts = any()
> * Protocol = module()
> * ProtoOpts = any()
>
> Return child specifications for a new listener.
>
> This function can be used to embed a listener directly
> in an application instead of letting Ranch handle it.
### get_max_connections(Ref) -> MaxConns
> Types:
> * Ref = ref()
> * MaxConns = max_conns()
>
> Return the max number of connections allowed for the given listener.
### get_port(Ref) -> Port
> Types:
> * Ref = ref()
> * Port = inet:port_number()
>
> Return the port for the given listener.
### get_protocol_options(Ref) -> ProtoOpts
> Types:
> * Ref = ref()
> * ProtoOpts = any()
>
> Return the protocol options set for the given listener.
### remove_connection(Ref) -> ok
> Types:
> * Ref = ref()
>
> Do not count this connection when limiting the number of connections.
>
> You can use this function for long-running connection processes
> which spend most of their time idling rather than consuming
> resources. This allows Ranch to accept a lot more connections
> without sacrificing the latency of the system.
>
> This function may only be called from a connection process.
### set_max_connections(Ref, MaxConns) -> ok
> Types:
> * Ref = ref()
> * MaxConns = max_conns()
>
> Set the max number of connections for the given listener.
>
> The change will be applied immediately. If the new value is
> smaller than the previous one, Ranch will not kill the extra
> connections, but will wait for them to terminate properly.
### set_protocol_options(Ref, ProtoOpts) -> ok
> Types:
> * Ref = ref()
> * ProtoOpts = any()
>
> Set the protocol options for the given listener.
>
> The change will be applied immediately for all new connections.
> Old connections will not receive the new options.
### start_listener(Ref, NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
-> {ok, pid()} | {error, badarg}
> Types:
> * Ref = ref()
> * NbAcceptors = non_neg_integer()
> * Transport = module()
> * TransOpts = any()
> * Protocol = module()
> * ProtoOpts = any()
>
> Start listening for connections using the given transport
> and protocol. Returns the pid for this listener's supervisor.
>
> There are five additional transport options that apply
> regardless of transport. They allow configuring how the
> connections are supervised, rate limited and allow using
> an already open listening socket.
>
> The `ack_timeout` option defines how long post-accept socket
> initialization should take at a maximum. It defaults to `5000`.
>
> The `connection_type` option defines the type of process
> that will handle the connection. It can be either `worker`
> or `supervisor`. It defaults to `worker`.
>
> The `max_connections` option determines how many active
> connections are allowed before Ranch starts throttling
> the accept rate. This is a soft limit. It defaults to `1024`.
> Using the value `infinity` will disable this functionality
> entirely.
>
> The `shutdown` option determines the policy used with
> regards to connection processes when shutting down the listener.
> It can be either a positive integer indicating the max number
> of ms the supervisor will wait before forcibly killing the
> children, or the atom `brutal_kill`. It defaults to `5000`.
>
> The `socket` option allow passing an already open listening
> socket. In this case, Ranch will not call `Transport:listen/1`
> and so none of the transport specific options apply.
### stop_listener(Ref) -> ok | {error, not_found}
> Types:
> * Ref = ref()
>
> Stop the given listener.
>
> The listener is stopped gracefully, first by closing the
> listening port, then by stopping the connection processes.
> These processes are stopped according to the `shutdown`
> transport option, which may be set to brutally kill all
> connection processes or give them some time to stop properly.
>
> This function does not return until the listener is
> completely stopped.
|
