1Mail::SpamAssassin::AsyUnsceLrooCpo(n3t)ributed Perl DocMuamieln:t:aStpiaomnAssassin::AsyncLoop(3)
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6 Mail::SpamAssassin::AsyncLoop - scanner asynchronous event loop
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9 An asynchronous event loop used for long-running operations, performed
10 "in the background" during the Mail::SpamAssassin::check() scan
11 operation, such as DNS blocklist lookups.
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14 $ent = $async->start_lookup($ent, $master_deadline)
15 Register the start of a long-running asynchronous lookup operation.
16 $ent is a hash reference containing the following items:
17 key (required)
19 A key string, unique to this lookup. This is what is reported
20 in debug messages, used as the key for "get_lookup()", etc.
21 id (required)
23 An ID string, also unique to this lookup. Typically, this is
24 the DNS packet ID as returned by DnsResolver's "bgsend" method.
25 Sadly, the Net::DNS architecture forces us to keep a separate
26 ID string for this task instead of reusing "key" -- if you are
27 not using DNS lookups through DnsResolver, it should be OK to
28 just reuse "key".
29 type (required)
31 A string, typically one word, used to describe the type of
32 lookup in log messages, such as "DNSBL", "MX", "TXT".
33 zone (optional)
35 A zone specification (typically a DNS zone name - e.g. host,
36 domain, or RBL) which may be used as a key to look up per-zone
37 settings. No semantics on this parameter is imposed by this
38 module. Currently used to fetch by-zone timeouts.
39 timeout_initial (optional)
41 An initial value of elapsed time for which we are willing to
42 wait for a response (time in seconds, floating point value is
43 allowed). When elapsed time since a query started exceeds the
44 timeout value and there are no other queries to wait for, the
45 query is aborted. The actual timeout value ranges from
46 timeout_initial and gradually approaches timeout_min (see next
47 parameter) as the number of already completed queries
48 approaches the number of all queries started.
49 If a caller does not explicitly provide this parameter or its
51 value is undefined, a default initial timeout value is settable
52 by a configuration variable rbl_timeout.
53 If a value of the timeout_initial parameter is below
55 timeout_min, the initial timeout is set to timeout_min.
56 timeout_min (optional)
58 A lower bound (in seconds) to which the actual timeout
59 approaches as the number of queries completed approaches the
60 number of all queries started. Defaults to 0.2 *
61 timeout_initial.
62 $ent is returned by this method, with its contents augmented by
64 additional information.
65 $ent = $async->bgsend_and_start_lookup($domain, $type, $class, $ent,
67 $cb, %options)
68 A common idiom: calls "bgsend", followed by a call to
69 "start_lookup", returning the argument $ent object as modified by
70 "start_lookup" and filled-in with a query ID.
71 $ent = $async->get_lookup($key)
73 Retrieve the pending-lookup object for the given key $key.
74 If the lookup is complete, this will return "undef".
76 Note that a lookup is still considered "pending" until
78 "complete_lookups()" is called, even if it has been reported as
79 complete via "set_response_packet()".
80 $async->log_lookups_timing()
82 Log sorted timing for all completed lookups.
83 $alldone = $async->complete_lookups()
85 Perform a poll of the pending lookups, to see if any are completed.
86 Callbacks on completed queries will be called from
87 poll_responses().
88 If there are no lookups remaining, or if too much time has elapsed
90 since any results were returned, 1 is returned, otherwise 0.
91 $async->abort_remaining_lookups()
93 Abort any remaining lookups.
94 $async->set_response_packet($id, $pkt, $key, $timestamp)
96 Register a "response packet" for a given query. $id is the ID for
97 the query, and must match the "id" supplied in "start_lookup()".
98 $pkt is the packet object for the response. A parameter $key
99 identifies an entry in a hash %{$self->{pending_lookups}} where the
100 object which spawned this query can be found, and through which
101 futher information about the query is accessible.
102 $pkt may be undef, indicating that no response packet is available,
104 but a query has completed (e.g. was aborted or dismissed) and is no
105 longer "pending".
106 The DNS resolver's response packet $pkt will be made available to a
108 callback subroutine through its argument as well as in
109 "$ent-<gt"{response_packet}>.
110 $async->report_id_complete($id,$key,$key,$timestamp)
112 Legacy. Equivalent to
113 $self->set_response_packet($id,undef,$key,$timestamp), i.e.
114 providing undef as a response packet. Register that a query has
115 completed and is no longer "pending". $id is the ID for the query,
116 and must match the "id" supplied in "start_lookup()".
117 One or the other of "set_response_packet()" or
119 "report_id_complete()" should be called, but not both.
120 $time = $async->last_poll_responses_time()
122 Get the time of the last call to "poll_responses()" (which is
123 called from "complete_lookups()". If "poll_responses()" was never
124 called or "abort_remaining_lookups()" has been called
125 "last_poll_responses_time()" will return undef.
126perl v5.26.3 2018-09-14 Mail::SpamAssassin::AsyncLoop(3)