1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent::SNMP - adaptor to integrate Net::SNMP into Anyevent. |
3 | AnyEvent::SNMP - adaptor to integrate Net::SNMP into AnyEvent. |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use AnyEvent::SNMP; |
7 | use AnyEvent::SNMP; |
8 | use Net::SNMP; |
8 | use Net::SNMP; |
… | |
… | |
23 | my @result = $cv->wait; |
23 | my @result = $cv->wait; |
24 | |
24 | |
25 | =head1 DESCRIPTION |
25 | =head1 DESCRIPTION |
26 | |
26 | |
27 | This module implements an alternative "event dispatcher" for Net::SNMP, |
27 | This module implements an alternative "event dispatcher" for Net::SNMP, |
28 | using AnyEvent as a backend. |
28 | using AnyEvent as a backend. This integrates Net::SNMP into AnyEvent. That |
29 | |
29 | means you can make non-blocking Net::SNMP calls and as long as other |
30 | This integrates Net::SNMP into AnyEvent: You can make non-blocking |
30 | parts of your program also use AnyEvent (or some event loop supported by |
31 | Net::SNMP calls and as long as other parts of your program also use |
31 | AnyEvent), they will run in parallel. |
32 | AnyEvent (or some event loop supported by AnyEvent), they will run in |
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33 | parallel. |
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34 | |
32 | |
35 | Also, the Net::SNMP scheduler is very inefficient with respect to both CPU |
33 | Also, the Net::SNMP scheduler is very inefficient with respect to both CPU |
36 | and memory usage. Most AnyEvent backends (including the pure-perl backend) |
34 | and memory usage. Most AnyEvent backends (including the pure-perl backend) |
37 | fare much better than the Net::SNMP dispatcher. |
35 | fare much better than the Net::SNMP dispatcher. |
38 | |
36 | |
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37 | Another major added feature of this module over Net::SNMP is automatic |
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38 | rate-adjustments: Net::SNMP is so slow that firing a few thousand |
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39 | requests can cause many timeouts simply because Net::SNMP cannot process |
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40 | the replies in time. This module automatically adapts the send rate to |
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41 | avoid false timeouts caused by slow reply processing. |
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42 | |
39 | A potential disadvantage is that replacing the dispatcher is not at all |
43 | A potential disadvantage of this module is that replacing the dispatcher |
40 | a documented thing to do, so future changes in Net::SNP might break this |
44 | is not at all a documented thing to do, so future changes in Net::SNMP |
41 | module (or the many similar ones). |
45 | might break this module (or the many similar ones). |
42 | |
46 | |
43 | This module does not export anything and does not require you to do |
47 | This module does not export anything and does not require you to do |
44 | anything special apart from loading it I<before doing any non-blocking |
48 | anything special apart from loading it I<before doing any non-blocking |
45 | requests with Net::SNMP>. It is recommended but not required to load this |
49 | requests with Net::SNMP>. It is recommended but not required to load this |
46 | module before C<Net::SNMP>. |
50 | module before C<Net::SNMP>. |
47 | |
51 | |
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52 | =head1 GLOBAL VARIABLES |
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53 | |
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54 | =over 4 |
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55 | |
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56 | =item $AnyEvent::SNMP::MAX_OUTSTANDING (default: C<50>, dynamic) |
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57 | |
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58 | =item AnyEvent::SNMP::set_max_outstanding $new_value |
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59 | |
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60 | Use this package variable to restrict the number of outstanding SNMP |
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61 | requests at any point in time. |
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62 | |
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63 | Net::SNMP is very fast at creating and sending SNMP requests, but much |
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64 | slower at parsing (big, bulk) responses. This makes it easy to request a |
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65 | lot of data that can take many seconds to parse. |
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66 | |
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67 | In the best case, this can lead to unnecessary delays (and even time-outs, |
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68 | as the data has been received but not yet processed) and in the worst |
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69 | case, this can lead to packet loss, when the receive queue overflows and |
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70 | the kernel can no longer accept new packets. |
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71 | |
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72 | To avoid this, you can (and should) limit the number of outstanding |
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73 | requests to a number low enough so that parsing time doesn't introduce |
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74 | noticeable delays. |
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75 | |
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76 | Unfortunately, this number depends not only on processing speed and load |
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77 | of the machine running Net::SNMP, but also on the network latency and the |
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78 | speed of your SNMP agents. |
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79 | |
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80 | AnyEvent::SNMP tries to dynamically adjust this number upwards and |
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81 | downwards. |
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82 | |
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83 | Increasing C<$MAX_OUTSTANDING> will not automatically use the |
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84 | extra request slots. To increase C<$MAX_OUTSTANDING> and make |
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85 | C<AnyEvent::SNMP> make use of the extra parallelity, call |
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86 | C<AnyEvent::SNMP::set_max_outstanding> with the new value, e.g.: |
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87 | |
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88 | AnyEvent::SNMP::set_max_outstanding 500; |
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89 | |
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90 | Although due to the dynamic adjustment, this might have little lasting |
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91 | effect. |
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92 | |
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93 | Note that you can use L<Net::SNMP::XS> to speed up parsing of responses |
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94 | considerably. |
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95 | |
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96 | =item $AnyEvent::SNMP::MIN_RECVQUEUE (default: C<8>) |
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97 | |
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98 | =item $AnyEvent::SNMP::MAX_RECVQUEUE (default: C<64>) |
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99 | |
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100 | These values specify the minimum and maximum receive queue length (in |
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101 | units of one response packet). |
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102 | |
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103 | When AnyEvent::SNMP handles $MAX_RECVQUEUE or more packets per iteration |
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104 | it will reduce $MAX_OUTSTANDING. If it handles less than $MIN_RECVQUEUE, |
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105 | it increases $MAX_OUTSTANDING. |
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106 | |
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107 | This has the result of adjusting the number of outstanding requests so that |
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108 | the recv queue is between the minimum and maximum, usually. |
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109 | |
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110 | This algorithm works reasonably well as long as the responses, response |
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111 | latencies and processing times are the same per packet on average. |
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112 | |
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113 | =back |
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114 | |
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115 | =head1 COMPATIBILITY |
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116 | |
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117 | This module may be used as a drop in replacement for the |
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118 | Net::SNMP::Dispatcher in existing programs. You can still call |
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119 | C<snmp_dispatcher> to start the event-loop, but then you loose the benefit |
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120 | of mixing Net::SNMP events with other events. |
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121 | |
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122 | use AnyEvent::SNMP; |
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123 | use Net::SNMP; |
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124 | |
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125 | # just use Net::SNMP as before |
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126 | |
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127 | # ... start non-blocking snmp request(s)... |
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128 | Net::SNMP->session ( |
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129 | -hostname => "127.0.0.1", |
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130 | -community => "public", |
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131 | -nonblocking => 1, |
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132 | )->get_request (-callback => sub { ... }); |
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133 | |
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134 | snmp_dispatcher; |
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135 | |
48 | =cut |
136 | =cut |
49 | |
137 | |
50 | package AnyEvent::SNMP; |
138 | package AnyEvent::SNMP; |
51 | |
139 | |
52 | no warnings; |
140 | use common::sense; |
53 | use strict qw(subs vars); |
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54 | |
141 | |
55 | # it is possible to do this without loading |
142 | # it is possible to do this without loading |
56 | # Net::SNMP::Dispatcher, but much more awkward. |
143 | # Net::SNMP::Dispatcher, but much more awkward. |
57 | use Net::SNMP::Dispatcher; |
144 | use Net::SNMP::Dispatcher; |
58 | |
145 | |
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146 | # we could inherit fro Net:SNMP::Dispatcher, but since this is undocumented, |
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147 | # I'd rather see it die (and reported) than silenty and subtly fail. |
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148 | *msg_handle_alloc = \&Net::SNMP::Dispatcher::msg_handle_alloc; |
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149 | |
59 | sub Net::SNMP::Dispatcher::instance { |
150 | sub Net::SNMP::Dispatcher::instance { |
60 | AnyEvent::SNMP:: |
151 | AnyEvent::SNMP:: |
61 | } |
152 | } |
62 | |
153 | |
63 | use Net::SNMP (); |
154 | use Net::SNMP (); |
64 | use AnyEvent (); |
155 | use AnyEvent (); |
65 | |
156 | |
66 | our $VERSION = '0.1'; |
157 | our $VERSION = '6.02'; |
67 | |
158 | |
68 | $Net::SNMP::DISPATCHER = instance Net::SNMP::Dispatcher; |
159 | $Net::SNMP::DISPATCHER = instance Net::SNMP::Dispatcher; |
69 | |
160 | |
70 | our $MESSAGE_PROCESSING = $Net::SNMP::Dispatcher::MESSAGE_PROCESSING; |
161 | our $MESSAGE_PROCESSING = $Net::SNMP::Dispatcher::MESSAGE_PROCESSING; |
71 | |
162 | |
72 | # avoid the method call |
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73 | my $timer = sub { shift->timer (@_) }; |
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74 | AnyEvent::post_detect { $timer = AnyEvent->can ("timer") }; |
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75 | |
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76 | our $BUSY; |
163 | our $BUSY; |
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164 | our $DONE; # finished all jobs |
77 | our %TRANSPORT; # address => [count, watcher] |
165 | our @TRANSPORT; # fileno => [count, watcher] |
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166 | our @QUEUE; |
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167 | our $MAX_OUTSTANDING = 50; |
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168 | our $MIN_RECVQUEUE = 8; |
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169 | our $MAX_RECVQUEUE = 64; |
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170 | |
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171 | sub kick_job; |
78 | |
172 | |
79 | sub _send_pdu { |
173 | sub _send_pdu { |
80 | my ($pdu, $retries) = @_; |
174 | my ($pdu, $retries) = @_; |
81 | |
175 | |
82 | # mostly copied from Net::SNMP::Dispatch |
176 | # mostly copied from Net::SNMP::Dispatch |
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85 | # create the new outgoing message. |
179 | # create the new outgoing message. |
86 | my $msg = $MESSAGE_PROCESSING->prepare_outgoing_msg ($pdu); |
180 | my $msg = $MESSAGE_PROCESSING->prepare_outgoing_msg ($pdu); |
87 | |
181 | |
88 | if (!defined $msg) { |
182 | if (!defined $msg) { |
89 | --$BUSY; |
183 | --$BUSY; |
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184 | kick_job; |
90 | # Inform the command generator about the Message Processing error. |
185 | # Inform the command generator about the Message Processing error. |
91 | $pdu->status_information ($MESSAGE_PROCESSING->error); |
186 | $pdu->status_information ($MESSAGE_PROCESSING->error); |
92 | return; |
187 | return; |
93 | } |
188 | } |
94 | |
189 | |
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97 | $MESSAGE_PROCESSING->msg_handle_delete ($pdu->msg_id) |
192 | $MESSAGE_PROCESSING->msg_handle_delete ($pdu->msg_id) |
98 | if $pdu->expect_response; |
193 | if $pdu->expect_response; |
99 | |
194 | |
100 | # A crude attempt to recover from temporary failures. |
195 | # A crude attempt to recover from temporary failures. |
101 | if ($retries-- > 0 && ($!{EAGAIN} || $!{EWOULDBLOCK} || $!{ENOSPC})) { |
196 | if ($retries-- > 0 && ($!{EAGAIN} || $!{EWOULDBLOCK} || $!{ENOSPC})) { |
102 | my $retry_w; $retry_w = AnyEvent->$timer (after => $pdu->timeout, cb => sub { |
197 | my $retry_w; $retry_w = AE::timer $pdu->timeout, 0, sub { |
103 | undef $retry_w; |
198 | undef $retry_w; |
104 | _send_pdu ($pdu, $retries); |
199 | _send_pdu ($pdu, $retries); |
105 | }); |
200 | }; |
106 | } else { |
201 | } else { |
107 | --$BUSY; |
202 | --$BUSY; |
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203 | kick_job; |
108 | } |
204 | } |
109 | |
205 | |
110 | # Inform the command generator about the send() error. |
206 | # Inform the command generator about the send() error. |
111 | $pdu->status_information ($msg->error); |
207 | $pdu->status_information ($msg->error); |
112 | return; |
208 | return; |
113 | } |
209 | } |
114 | |
210 | |
115 | # Schedule the timeout handler if the message expects a response. |
211 | # Schedule the timeout handler if the message expects a response. |
116 | if ($pdu->expect_response) { |
212 | if ($pdu->expect_response) { |
117 | my $transport = $msg->transport; |
213 | my $transport = $msg->transport; |
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214 | my $fileno = $transport->fileno; |
118 | |
215 | |
119 | # register the transport |
216 | # register the transport |
120 | unless ($TRANSPORT{$transport+0}[0]++) { |
217 | unless ($TRANSPORT[$fileno][0]++) { |
121 | $TRANSPORT{$transport+0}[1] = AnyEvent->io (fh => $transport->socket, poll => 'r', cb => sub { |
218 | $TRANSPORT[$fileno][1] = AE::io $transport->socket, 0, sub { |
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219 | for my $count (1..$MAX_RECVQUEUE) { # handle up to this many requests in one go |
122 | # Create a new Message object to receive the response |
220 | # Create a new Message object to receive the response |
123 | my ($msg, $error) = Net::SNMP::Message->new (-transport => $transport); |
221 | my ($msg, $error) = Net::SNMP::Message->new (-transport => $transport); |
124 | |
222 | |
125 | if (!defined $msg) { |
223 | if (!defined $msg) { |
126 | die sprintf 'Failed to create Message object [%s]', $error; |
224 | die sprintf 'Failed to create Message object [%s]', $error; |
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225 | } |
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226 | |
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227 | # Read the message from the Transport Layer |
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228 | if (!defined $msg->recv) { |
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229 | if ($transport->connectionless) { |
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230 | # if we handled very few replies and we have queued work, try |
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231 | # to increase the parallelity as we probably can handle more. |
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232 | if ($count < $MIN_RECVQUEUE && @QUEUE) { |
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233 | ++$MAX_OUTSTANDING; |
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234 | kick_job; |
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235 | } |
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236 | } else { |
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237 | # for some reason, connected-oriented transports seem to need this |
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238 | delete $TRANSPORT[$fileno] |
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239 | unless --$TRANSPORT[$fileno][0]; |
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240 | } |
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241 | |
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242 | $msg->error; |
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243 | return; |
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244 | } |
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245 | |
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246 | # For connection-oriented Transport Domains, it is possible to |
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247 | # "recv" an empty buffer if reassembly is required. |
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248 | if (!$msg->length) { |
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249 | return; |
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250 | } |
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251 | |
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252 | # Hand the message over to Message Processing. |
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253 | if (!defined $MESSAGE_PROCESSING->prepare_data_elements ($msg)) { |
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254 | $MESSAGE_PROCESSING->error; |
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255 | return; |
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256 | } |
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257 | |
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258 | # Set the error if applicable. |
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259 | $msg->error ($MESSAGE_PROCESSING->error) if $MESSAGE_PROCESSING->error; |
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260 | |
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261 | # Notify the command generator to process the response. |
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262 | # Net::SNMP calls process_response_pdu, which simply calls callback_execute, |
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263 | # but some errors cause $msg to be of type Net::SNMP::Message, not Net::SMMP::PDU, |
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264 | # so we call the underlying callback_execute method which exists on both and |
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265 | # seems to do the right thing. |
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266 | $msg->callback_execute; |
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267 | |
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268 | # Cancel the timeout. |
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269 | my $rtimeout_w = $msg->timeout_id; |
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270 | if ($$rtimeout_w) { |
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271 | undef $$rtimeout_w; |
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272 | |
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273 | --$BUSY; |
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274 | kick_job; |
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275 | |
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276 | unless (--$TRANSPORT[$fileno][0]) { |
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277 | delete $TRANSPORT[$fileno]; |
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278 | return; |
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279 | } |
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280 | } |
127 | } |
281 | } |
128 | |
282 | |
129 | # Read the message from the Transport Layer |
283 | # when we end up here, we successfully handled $MAX_RECVQUEUE |
130 | if (!defined $msg->recv) { |
284 | # replies in one iteration, so assume we are overloaded |
131 | # for some reason, connected-oriented transports seem to need this |
285 | # and reduce the amount of parallelity. |
132 | unless ($transport->connectionless) { |
286 | $MAX_OUTSTANDING = (int $MAX_OUTSTANDING * 0.95) || 1; |
133 | delete $TRANSPORT{$transport+0} |
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134 | unless --$TRANSPORT{$transport+0}[0]; |
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135 | } |
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136 | |
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137 | $msg->error; |
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138 | return; |
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139 | } |
287 | }; |
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288 | } |
140 | |
289 | |
141 | # For connection-oriented Transport Domains, it is possible to |
290 | $msg->timeout_id (\(my $rtimeout_w = |
142 | # "recv" an empty buffer if reassembly is required. |
291 | AE::timer $pdu->timeout, 0, sub { |
143 | if (!$msg->length) { |
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144 | return; |
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145 | } |
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146 | |
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147 | # Hand the message over to Message Processing. |
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148 | if (!defined $MESSAGE_PROCESSING->prepare_data_elements ($msg)) { |
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149 | $MESSAGE_PROCESSING->error; |
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150 | return; |
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151 | } |
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152 | |
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153 | # Set the error if applicable. |
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154 | $msg->error ($MESSAGE_PROCESSING->error) if $MESSAGE_PROCESSING->error; |
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155 | |
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156 | # Cancel the timeout. |
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157 | my $rtimeout_w = $msg->timeout_id; |
292 | my $rtimeout_w = $msg->timeout_id; |
158 | if ($$rtimeout_w) { |
293 | if ($$rtimeout_w) { |
159 | undef $$rtimeout_w; |
294 | undef $$rtimeout_w; |
160 | delete $TRANSPORT{$transport+0} |
295 | delete $TRANSPORT[$fileno] |
161 | unless --$TRANSPORT{$transport+0}[0]; |
296 | unless --$TRANSPORT[$fileno][0]; |
162 | |
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163 | --$BUSY; |
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164 | } |
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165 | |
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166 | # Notify the command generator to process the response. |
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167 | $msg->process_response_pdu; |
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168 | }); |
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169 | } |
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170 | |
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171 | #####d# timeout_id, wtf? |
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172 | $msg->timeout_id (\(my $rtimeout_w = |
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173 | AnyEvent->$timer (after => $pdu->timeout, cb => sub { |
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174 | my $rtimeout_w = $msg->timeout_id; |
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175 | if ($$rtimeout_w) { |
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176 | undef $$rtimeout_w; |
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177 | delete $TRANSPORT{$transport+0} |
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178 | unless --$TRANSPORT{$transport+0}[0]; |
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179 | } |
297 | } |
180 | |
298 | |
181 | if ($retries--) { |
299 | if ($retries--) { |
182 | _send_pdu ($pdu, $retries); |
300 | _send_pdu ($pdu, $retries); |
183 | } else { |
301 | } else { |
184 | --$BUSY; |
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185 | $MESSAGE_PROCESSING->msg_handle_delete ($pdu->msg_id); |
302 | $MESSAGE_PROCESSING->msg_handle_delete ($pdu->msg_id); |
186 | $pdu->status_information ("No response from remote host '%s'", $pdu->hostname); |
303 | $pdu->status_information ("No response from remote host '%s'", $pdu->hostname); |
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304 | |
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305 | --$BUSY; |
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306 | kick_job; |
187 | } |
307 | } |
188 | }) |
308 | }) |
189 | )); |
309 | ); |
190 | } else { |
310 | } else { |
191 | --$BUSY; |
311 | --$BUSY; |
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312 | kick_job; |
192 | } |
313 | } |
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314 | } |
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315 | |
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316 | sub kick_job { |
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317 | while ($BUSY < $MAX_OUTSTANDING) { |
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318 | my $pdu = shift @QUEUE |
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319 | or last; |
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320 | |
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321 | ++$BUSY; |
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322 | _send_pdu $pdu, $pdu->retries; |
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323 | } |
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324 | |
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325 | $DONE and $DONE->() unless $BUSY; |
193 | } |
326 | } |
194 | |
327 | |
195 | sub send_pdu($$$) { |
328 | sub send_pdu($$$) { |
196 | my (undef, $pdu, $delay) = @_; |
329 | my (undef, $pdu, $delay) = @_; |
197 | |
330 | |
198 | ++$BUSY; |
331 | # $delay is not very sensibly implemented by AnyEvent::SNMP, |
199 | |
332 | # but apparently it is not a very sensible feature. |
200 | if ($delay > 0) { |
333 | if ($delay > 0) { |
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334 | ++$BUSY; |
201 | my $delay_w; $delay_w = AnyEvent->$timer (after => $delay, cb => sub { |
335 | my $delay_w; $delay_w = AE::timer $delay, 0, sub { |
202 | undef $delay_w; |
336 | undef $delay_w; |
203 | _send_pdu ($pdu, $pdu->retries); |
337 | push @QUEUE, $pdu; |
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338 | --$BUSY; |
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339 | kick_job; |
204 | }); |
340 | }; |
205 | return 1; |
341 | return 1; |
206 | } |
342 | } |
207 | |
343 | |
208 | _send_pdu $pdu, $pdu->retries; |
344 | push @QUEUE, $pdu; |
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345 | kick_job; |
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346 | |
209 | 1 |
347 | 1 |
210 | } |
348 | } |
211 | |
349 | |
212 | sub activate($) { |
350 | sub loop($) { |
213 | AnyEvent->one_event while $BUSY; |
351 | while ($BUSY) { |
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352 | $DONE = AE::cv; |
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353 | $DONE->recv; |
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354 | undef $DONE; |
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355 | } |
214 | } |
356 | } |
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357 | |
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358 | *activate = \&loop; # 5.x compatibility? |
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359 | *listen = \&loop; # 5.x compatibility? |
215 | |
360 | |
216 | sub one_event($) { |
361 | sub one_event($) { |
217 | die; |
362 | # should not ever be used |
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363 | AnyEvent->one_event; #d# todo |
218 | } |
364 | } |
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365 | |
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366 | sub set_max_outstanding($) { |
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367 | $MAX_OUTSTANDING = $_[0]; |
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368 | kick_job; |
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369 | } |
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370 | |
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371 | # not provided yet: |
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372 | # schedule # apparently only used by Net::SNMP::Dispatcher itself |
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373 | # register # apparently only used by Net::SNMP::Dispatcher itself |
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374 | # deregister # apparently only used by Net::SNMP::Dispatcher itself |
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375 | # cancel # apparently only used by Net::SNMP::Dispatcher itself |
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376 | # return_response_pdu # apparently not used at all? |
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377 | # error # only used by Net::SNMP::Dispatcher itself? |
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378 | # debug # only used by Net::SNMP::Dispatcher itself? |
219 | |
379 | |
220 | =head1 SEE ALSO |
380 | =head1 SEE ALSO |
221 | |
381 | |
222 | L<AnyEvent>, L<Net::SNMP>, L<Net::SNMP::EV>. |
382 | L<AnyEvent>, L<Net::SNMP>, L<Net::SNMP::XS>, L<Net::SNMP::EV>. |
223 | |
383 | |
224 | =head1 AUTHOR |
384 | =head1 AUTHOR |
225 | |
385 | |
226 | Marc Lehmann <schmorp@schmorp.de> |
386 | Marc Lehmann <schmorp@schmorp.de> |
227 | http://home.schmorp.de/ |
387 | http://home.schmorp.de/ |