[ViewVC] Annotation of: cvs/AnyEvent-MP/Changes

Revision history for AnyEvent::MP

TODO: testsuite
TODO: intro: maybe simple job pool example?
TODO: intro: mention watchdog...
TODO: maybe disbale warnings by default?
TODO: listener-scopes (10.0.0.1:4040@vpn) and connect-scopes ("vpn,public")

faq: can't se anything
faq: all is asynch
faq: how to interface to non-perl nodes?

TODO: update docs
TODO: switch to AnyEvent::Log
TODO: check gproto, nproto, on connect
TODO: maybe switch to md5+sha1+sha256 or so...
TODO: up_nodes for aemp-trace replace by rpc call?
TODO: listener-less nodes - not supported anymore
TODO: eg/*
TODO: timeout
TODO: porting-guide
TODO: global undocumented compat functions?
TODO: #TODO##d# markers
TODO: dataconn
TODO: static aemp run db_set config? metion in intro also (myservice)
2
        - INCOMPATIBLE CHANGE: the node protocol used by this version is not
          compatible to versions <2 - you have to upgrade all nodes.
        - INCOMPATIBLE CHANGE: many APIs have changed, see the section
          "PORTING FROM VERSION 1" in the AnyEvent::MP manpage for details.
        - AnyEvent::MP::Global is now optional - only seed nodes autoload it
          and create a fully-meshed network with each other, normal nodes only
          have to connect to seed nodes, other connections are on-demand.
        - new "norc" and "force" options for MP::configure to ignore
          or override the rc file.
        - move seed code to Kernel.
        - non-json receive framing was probably broken.
        - fixed small typo in MP::Transport.
        - fix (unused) provider-kv (version sometimes missing).
        - reduce the default export list of MP::Kernel.
        - reduced various random delays to zero, as they
          are hopefully no longer needed with the new global
          protocol.
        - implement a secure mode that can suppress code execution
          requests on a per-node/per-request basis.
        - do not use GMP for generating alphanumeric strings even when
          available, use a more tricky algorithm instead.
        - anonymous node names and remote port names have been shortened
          considerably.
        - $AnyEvent::MP::Kernel::SRCNODE contains the node ID of the origin
          node during message receives.
        - aemp shell now supports "package" selection and offers an
          $ECHO port you cna send messages to.
        - rely on perl rand() instead of using /dev/urandom when available, as
          hopefully it is random enough.
        - aemp shell no longer leaks one port per command.
        - nodenames can contain %-escapes such as %n or %u.
        - aemp now uses aemp/%n/%u as nodename.
        - known_nodes is gone, it has little value, use all_nodes as
          replacement.
        - lots of small change and improvements.
        - node_is_known has been removed.
        - TRACE now shows the portid on SND.

1.30 Thu Jun 30 11:30:39 CEST 2011
        - connection errors at the right time would kill node
          connections in a bad way (patch by Malcolm Studd).

1.29 Fri May  7 20:13:39 CEST 2010
        - codename "Sadrak".
        - fix error in callback at AnyEvent/MP/Global.pm line 339
          (found by Sadrak).
        - listener-less nodes had trouble sending keepalive
          messages on write timeouts (found by Sadrak).
        - the monitor guard could cause a memleak due
          to autovivification if a mon was cleared after
          the port was gone (analysed by Sadrak).
        - do not overwrite the config file if we couldn't read it
          for some reason (lesson demonstrated by Sadrak).

1.28 Thu Apr  1 21:23:54 CEST 2010
        - accepted connections didn't correctly set up the SRCNODE
          in some cases, leading to intra-node messages (such as monitoring)
          to fail silently (great testcase by Sadrak).

1.27 Sat Mar 20 21:11:16 CET 2010
        - avoid exceptions in the transport code if the connection
          fails during TLS negotiation.
        - delay new address broadcasts in seednodes, to reduce the
          likelyhood of nodes connecting at the same time, leading to
          message loss.
        - improve general message passing efficiency by 8%, and special
          case json framing for a 50% speed increase.
        - add hints how to interface to aemp nodes from other programming
          languages using the aemp protocol in AnyEvent::MP::Transport
          (it can really be quite simple).
        - handle unsupported remote framings more gracefully.

1.26 Wed Dec 30 16:48:37 CET 2009
        - INCOMPATIBLE CHANGE: the high-level node protocol changed,
          all nodes need to upgrade.
        - remote kil's did not work (reported by Eugene Grigoriev).
        - documented monitor_timeout, connect_interval, auth_offer,
          auth_accept, framing_format, autocork and nodelay options
          and make them configurable via bin/aemp.
        - some doc updates.
        - remote kil's were not synchronous to message sends which affected
          nobody, as remote kils were broken.
        - remote mon/unmonitor requests were not synchronous to message
          sends either sometimes, although it likely didnt matter.

1.24 Wed Dec  9 14:59:52 CET 2009
        - codename "the foul egg".
        - increased "unmonitored local port died" message level to 2, so
          it is displayed by default now.
        - generate random seed at configure time, not module loading time,
          so fork&configure works as expected.
        - decreased "seed"-related message priority in Global from 0 (d'oh)
          to 9, as they are not signifcant.
        - new experimental module AnyEvent::MP::DataConn to establish
          additional data connections between nodes.
        - bin/aemp now loads AnyEvent::Watchdog::Util before trying
          to call restart.
        - bin/aemp setcert didn't properly handle the filename argument.
        - removed empty and unused timeout= parameter from protocol greeting.

1.23 Fri Nov  6 18:46:26 CET 2009
        - listener-less nodes were misinformed by their masters about
          the location of new nodes, and therefore didn't connect
          properly in all cases.
        - messages send during node-up processing could sometimes get lost,
          which would hamper global's ability to mesh the network.
        - fixed AnyEvent::MP::Global::grp_reg to return a guard also
          in scalar context.
        - fixed AnyEvent::MP::Kernel::mon_nodes to return a guard also
          in scalar context.
        - try to improve error reporting when automatically loading
          a function - being unable to load a module will now
          stop the process and report the error.

1.22 Sat Oct 17 03:41:47 CEST 2009
        - fix two rcv-bugs: after adding a tagged rcv, the default
          callback would not be used or changed anymore (reported
          by Felix Antonius Wilhelm Ostmann, with apologies for
          taking so long to releae the fix).
        - added Coro::MP introduction to AnyEvent::MP::Intro.
        - add peval function.

1.21 Mon Oct  5 21:58:36 CEST 2009
        - always delay kil messages.
        - remote monitor requests were never cleaned up (found by
          Sadrak and analysed by elmex).
        - move $VERSION to AnyEvent::MP and AnyEvent::MP only.

1.2  Thu Oct  1 22:59:35 CEST 2009
        - fix a rather big bug where message processing could be
          inhibited completely.
        - grp_mon could not return a guard due to a typo.
        - implement primitive aemp shell.
        - do not use bound address as listen length (reported by
          Felix Antonius Wilhelm Ostman).
        - no longer export an undefined "reg" function from AE::MP.
        - the mon_guard return value no longer keeps an additional
          reference to the passed refs.

1.1  Fri Sep 11 04:34:03 CEST 2009
        - bumped the transport protocol to version 1 - sorry, but there
          were too many bugfixes/changes.
        - new function AnyEvent::MP::cal for simple rpc.
        - renamed AnyEvent::MP::Global functions to grp_reg|get|mon.
        - implemented monitoring for Global groups.
        - removed all userspace time-outs from the transport, instead
          rely on tcp retransmit timeouts and tcp keepalive.
        - spawn now delays spawns on the local node artificially, so
          it can return before invoking the init function.
        - break endless recursion between ping-pong ports on the local
          node after ~50 iterations.
        - support JSON-encoded aemp arguments.
        - added aemp restart.
        - support for starting init functions with parameters added.
        - data_format, auth_offer and auth_accept are now configurable, albeit
          not documented.
        - new service: AnyEvent::MP::LogCatcher.
        - rely on perl srand'ing better than we could.
        - try to backport to 5.8.2, unfortunately, recursive dependencies
          rely on Module::Build, which fails at 5.8.7, so YMMV.
        - use a vastly different reseeding strategy.
        - use seed nodes to notify nodes about new nodes.
        - in the case where a ndoe learns new addresses after it tried
          connecting, prefer the new addrseses over the old ones.

1.0  Wed Sep  2 20:40:43 CEST 2009
        - randomise more connection times, but reduce delay to 0.2s (seeds)
          and 0.05s (normal connects).
        - upgrade to and require AnyEvent::Watchdog 1.0.

0.95 Mon Aug 31 22:03:55 CEST 2009
        - tutorial finally covers all the basics, maybe not optimally, but it
          is covered.
        - rename initialise_node to configure and accepts key => value
          pairs for configuration.
        - give aemp a full manpage.
        - bin/aemp now expects comma-separated lists and supports multiple
          subcommands.
        - new aemp eval subcommand.
        - new aemp parent subcommand.
        - nodes get freed when no longer needed.
        - support "*" hostname to specify all local interface addresses
          (without localhost etc.).
        - support "*" port to specify a dynamically-assigned port (which
          is the default now).
        - fix per-transport memory leak.

0.9  Sat Aug 29 18:47:45 CEST 2009
        - tutorial was updated to reflect the current API, but
          does not touch monitoring yet.
        - got rid of noderefs and slave nodes entirely, introduce
          free-text node identifiers and anonymous nodes.
        - document security issues with tls_anon method and introduce
          optional tls_md6_64_256 method.

0.8  Wed Aug 19 07:54:50 CEST 2009
        - added AnyEvent::MP::Global service.
        - support "package::" names as service names.
        - many, many, many bugfixes and tweaks.

0.7  Sat Aug 15 01:18:51 CEST 2009
        - sorry, another major API simplification.
        - greatly improved aemp configuration abilities.
        - introduced profile management.
        - updated exmaples in eg/.
        - added Kernel::snd_to_func.

0.6  Thu Aug 13 03:15:05 CEST 2009
        - do away with .aemp-secret and use .perl-anyevent-mp as json config
          file.
        - introduce bin/aemp to configure nodes.
        - too many changes to describe.

0.4  Sun Aug  9 18:05:49 CEST 2009
        - API should now be really stable :)
        - distinguish between resolved and unresolved noderefs.
        - certificates in .aemp-secret are now supported.
        - change port creation semantics.
        - replace become_xxx by initialise_node.
        - implement AE::MP::spawn.
        - implement transport timeouts, monitoring, reconnecting.
        - simplify and partially document the transport protocol.

0.1  Tue Aug  4 23:07:11 CEST 2009
        - AnyEvent::MP API should be mostly stable by now.

0.02 Sun Aug  2 17:46:43 CEST 2009
        - design has stabilised a bit, sitll unusable.

0.01 Sat Aug  1 11:43:31 CEST 2009
        - dummy upload to reserve namespace on CPAN.

0.0  Thu Jul 30 06:10:15 CEST 2009
        - original version, an AnyEvent::AIO clone.
Revision:	1.136
Committed:	Wed Mar 21 15:22:16 2012 UTC (12 years, 1 month ago) by root
Branch:	MAIN
Changes since 1.135:	+4 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	Revision history for AnyEvent::MP
2
3	root	1.92	TODO: testsuite
4			TODO: intro: maybe simple job pool example?
5			TODO: intro: mention watchdog...
6	root	1.114	TODO: maybe disbale warnings by default?
7	root	1.121	TODO: listener-scopes (10.0.0.1:4040@vpn) and connect-scopes ("vpn,public")
8	root	1.92
9	root	1.100	faq: can't se anything
10			faq: all is asynch
11			faq: how to interface to non-perl nodes?
12
13	root	1.121	TODO: update docs
14			TODO: switch to AnyEvent::Log
15	root	1.128	TODO: check gproto, nproto, on connect
16	root	1.121	TODO: maybe switch to md5+sha1+sha256 or so...
17	root	1.122	TODO: up_nodes for aemp-trace replace by rpc call?
18	root	1.129	TODO: listener-less nodes - not supported anymore
19	root	1.130	TODO: eg/*
20	root	1.131	TODO: timeout
21			TODO: porting-guide
22			TODO: global undocumented compat functions?
23	root	1.132	TODO: #TODO##d# markers
24	root	1.134	TODO: dataconn
25	root	1.135	TODO: static aemp run db_set config? metion in intro also (myservice)
26	root	1.118	2
27			- INCOMPATIBLE CHANGE: the node protocol used by this version is not
28	root	1.121	compatible to versions <2 - you have to upgrade all nodes.
29	root	1.124	- INCOMPATIBLE CHANGE: many APIs have changed, see the section
30			"PORTING FROM VERSION 1" in the AnyEvent::MP manpage for details.
31	root	1.121	- AnyEvent::MP::Global is now optional - only seed nodes autoload it
32			and create a fully-meshed network with each other, normal nodes only
33			have to connect to seed nodes, other connections are on-demand.
34	root	1.118	- new "norc" and "force" options for MP::configure to ignore
35			or override the rc file.
36	root	1.116	- move seed code to Kernel.
37	root	1.136	- non-json receive framing was probably broken.
38	root	1.118	- fixed small typo in MP::Transport.
39			- fix (unused) provider-kv (version sometimes missing).
40			- reduce the default export list of MP::Kernel.
41	root	1.120	- reduced various random delays to zero, as they
42			are hopefully no longer needed with the new global
43			protocol.
44	root	1.136	- implement a secure mode that can suppress code execution
45	root	1.126	requests on a per-node/per-request basis.
46	root	1.122	- do not use GMP for generating alphanumeric strings even when
47			available, use a more tricky algorithm instead.
48	root	1.121	- anonymous node names and remote port names have been shortened
49			considerably.
50	root	1.136	- $AnyEvent::MP::Kernel::SRCNODE contains the node ID of the origin
51			node during message receives.
52	root	1.122	- aemp shell now supports "package" selection and offers an
53			$ECHO port you cna send messages to.
54			- rely on perl rand() instead of using /dev/urandom when available, as
55			hopefully it is random enough.
56	root	1.123	- aemp shell no longer leaks one port per command.
57	root	1.125	- nodenames can contain %-escapes such as %n or %u.
58			- aemp now uses aemp/%n/%u as nodename.
59	root	1.124	- known_nodes is gone, it has little value, use all_nodes as
60			replacement.
61	root	1.125	- lots of small change and improvements.
62	root	1.134	- node_is_known has been removed.
63	root	1.129	- TRACE now shows the portid on SND.
64	elmex	1.115
65	root	1.114	1.30 Thu Jun 30 11:30:39 CEST 2011
66			- connection errors at the right time would kill node
67			connections in a bad way (patch by Malcolm Studd).
68	root	1.107
69	root	1.113	1.29 Fri May 7 20:13:39 CEST 2010
70			- codename "Sadrak".
71	root	1.111	- fix error in callback at AnyEvent/MP/Global.pm line 339
72			(found by Sadrak).
73	root	1.108	- listener-less nodes had trouble sending keepalive
74	root	1.109	messages on write timeouts (found by Sadrak).
75			- the monitor guard could cause a memleak due
76			to autovivification if a mon was cleared after
77			the port was gone (analysed by Sadrak).
78	root	1.112	- do not overwrite the config file if we couldn't read it
79			for some reason (lesson demonstrated by Sadrak).
80	root	1.108
81	root	1.106	1.28 Thu Apr 1 21:23:54 CEST 2010
82	root	1.111	- accepted connections didn't correctly set up the SRCNODE
83	root	1.106	in some cases, leading to intra-node messages (such as monitoring)
84			to fail silently (great testcase by Sadrak).
85
86	root	1.105	1.27 Sat Mar 20 21:11:16 CET 2010
87	root	1.101	- avoid exceptions in the transport code if the connection
88			fails during TLS negotiation.
89	root	1.102	- delay new address broadcasts in seednodes, to reduce the
90	root	1.103	likelyhood of nodes connecting at the same time, leading to
91	root	1.102	message loss.
92	root	1.104	- improve general message passing efficiency by 8%, and special
93			case json framing for a 50% speed increase.
94	root	1.99	- add hints how to interface to aemp nodes from other programming
95			languages using the aemp protocol in AnyEvent::MP::Transport
96			(it can really be quite simple).
97	root	1.100	- handle unsupported remote framings more gracefully.
98	root	1.99
99	root	1.98	1.26 Wed Dec 30 16:48:37 CET 2009
100	root	1.94	- INCOMPATIBLE CHANGE: the high-level node protocol changed,
101			all nodes need to upgrade.
102	root	1.93	- remote kil's did not work (reported by Eugene Grigoriev).
103	root	1.94	- documented monitor_timeout, connect_interval, auth_offer,
104			auth_accept, framing_format, autocork and nodelay options
105			and make them configurable via bin/aemp.
106	root	1.96	- some doc updates.
107			- remote kil's were not synchronous to message sends which affected
108			nobody, as remote kils were broken.
109	root	1.97	- remote mon/unmonitor requests were not synchronous to message
110			sends either sometimes, although it likely didnt matter.
111	root	1.92
112	root	1.91	1.24 Wed Dec 9 14:59:52 CET 2009
113	root	1.87	- codename "the foul egg".
114			- increased "unmonitored local port died" message level to 2, so
115			it is displayed by default now.
116	root	1.89	- generate random seed at configure time, not module loading time,
117			so fork&configure works as expected.
118	root	1.88	- decreased "seed"-related message priority in Global from 0 (d'oh)
119			to 9, as they are not signifcant.
120	root	1.85	- new experimental module AnyEvent::MP::DataConn to establish
121			additional data connections between nodes.
122	root	1.84	- bin/aemp now loads AnyEvent::Watchdog::Util before trying
123			to call restart.
124	elmex	1.86	- bin/aemp setcert didn't properly handle the filename argument.
125	root	1.90	- removed empty and unused timeout= parameter from protocol greeting.
126	root	1.44
127	root	1.82	1.23 Fri Nov 6 18:46:26 CET 2009
128	root	1.80	- listener-less nodes were misinformed by their masters about
129			the location of new nodes, and therefore didn't connect
130			properly in all cases.
131	root	1.81	- messages send during node-up processing could sometimes get lost,
132			which would hamper global's ability to mesh the network.
133			- fixed AnyEvent::MP::Global::grp_reg to return a guard also
134			in scalar context.
135			- fixed AnyEvent::MP::Kernel::mon_nodes to return a guard also
136			in scalar context.
137	root	1.79	- try to improve error reporting when automatically loading
138			a function - being unable to load a module will now
139			stop the process and report the error.
140	elmex	1.78
141	root	1.77	1.22 Sat Oct 17 03:41:47 CEST 2009
142			- fix two rcv-bugs: after adding a tagged rcv, the default
143			callback would not be used or changed anymore (reported
144			by Felix Antonius Wilhelm Ostmann, with apologies for
145			taking so long to releae the fix).
146	root	1.76	- added Coro::MP introduction to AnyEvent::MP::Intro.
147	root	1.75	- add peval function.
148
149	root	1.74	1.21 Mon Oct 5 21:58:36 CEST 2009
150	root	1.72	- always delay kil messages.
151	root	1.74	- remote monitor requests were never cleaned up (found by
152			Sadrak and analysed by elmex).
153			- move $VERSION to AnyEvent::MP and AnyEvent::MP only.
154	root	1.72
155	root	1.71	1.2 Thu Oct 1 22:59:35 CEST 2009
156	root	1.70	- fix a rather big bug where message processing could be
157			inhibited completely.
158	root	1.65	- grp_mon could not return a guard due to a typo.
159	root	1.66	- implement primitive aemp shell.
160	root	1.67	- do not use bound address as listen length (reported by
161			Felix Antonius Wilhelm Ostman).
162	root	1.68	- no longer export an undefined "reg" function from AE::MP.
163	root	1.69	- the mon_guard return value no longer keeps an additional
164			reference to the passed refs.
165	root	1.65
166	root	1.64	1.1 Fri Sep 11 04:34:03 CEST 2009
167	root	1.63	- bumped the transport protocol to version 1 - sorry, but there
168			were too many bugfixes/changes.
169			- new function AnyEvent::MP::cal for simple rpc.
170	root	1.49	- renamed AnyEvent::MP::Global functions to grp_reg\|get\|mon.
171	root	1.63	- implemented monitoring for Global groups.
172	root	1.50	- removed all userspace time-outs from the transport, instead
173			rely on tcp retransmit timeouts and tcp keepalive.
174	root	1.48	- spawn now delays spawns on the local node artificially, so
175			it can return before invoking the init function.
176	root	1.55	- break endless recursion between ping-pong ports on the local
177			node after ~50 iterations.
178	root	1.47	- support JSON-encoded aemp arguments.
179	root	1.51	- added aemp restart.
180	root	1.52	- support for starting init functions with parameters added.
181	root	1.53	- data_format, auth_offer and auth_accept are now configurable, albeit
182			not documented.
183	root	1.54	- new service: AnyEvent::MP::LogCatcher.
184	root	1.58	- rely on perl srand'ing better than we could.
185			- try to backport to 5.8.2, unfortunately, recursive dependencies
186			rely on Module::Build, which fails at 5.8.7, so YMMV.
187			- use a vastly different reseeding strategy.
188	root	1.61	- use seed nodes to notify nodes about new nodes.
189	root	1.63	- in the case where a ndoe learns new addresses after it tried
190			connecting, prefer the new addrseses over the old ones.
191	root	1.46
192	root	1.45	1.0 Wed Sep 2 20:40:43 CEST 2009
193	root	1.44	- randomise more connection times, but reduce delay to 0.2s (seeds)
194			and 0.05s (normal connects).
195	root	1.45	- upgrade to and require AnyEvent::Watchdog 1.0.
196	root	1.36
197	root	1.42	0.95 Mon Aug 31 22:03:55 CEST 2009
198	root	1.43	- tutorial finally covers all the basics, maybe not optimally, but it
199			is covered.
200	root	1.38	- rename initialise_node to configure and accepts key => value
201			pairs for configuration.
202	root	1.33	- give aemp a full manpage.
203	root	1.30	- bin/aemp now expects comma-separated lists and supports multiple
204			subcommands.
205	root	1.31	- new aemp eval subcommand.
206	root	1.34	- new aemp parent subcommand.
207	root	1.31	- nodes get freed when no longer needed.
208	root	1.35	- support "*" hostname to specify all local interface addresses
209			(without localhost etc.).
210	root	1.38	- support "*" port to specify a dynamically-assigned port (which
211			is the default now).
212	root	1.32	- fix per-transport memory leak.
213	root	1.30
214	root	1.29	0.9 Sat Aug 29 18:47:45 CEST 2009
215			- tutorial was updated to reflect the current API, but
216	root	1.43	does not touch monitoring yet.
217	root	1.24	- got rid of noderefs and slave nodes entirely, introduce
218	root	1.25	free-text node identifiers and anonymous nodes.
219	root	1.26	- document security issues with tls_anon method and introduce
220			optional tls_md6_64_256 method.
221	root	1.23
222			0.8 Wed Aug 19 07:54:50 CEST 2009
223	root	1.22	- added AnyEvent::MP::Global service.
224	root	1.20	- support "package::" names as service names.
225	root	1.21	- many, many, many bugfixes and tweaks.
226	root	1.20
227	root	1.19	0.7 Sat Aug 15 01:18:51 CEST 2009
228			- sorry, another major API simplification.
229	root	1.17	- greatly improved aemp configuration abilities.
230			- introduced profile management.
231	root	1.18	- updated exmaples in eg/.
232			- added Kernel::snd_to_func.
233	root	1.16
234	root	1.14	0.6 Thu Aug 13 03:15:05 CEST 2009
235			- do away with .aemp-secret and use .perl-anyevent-mp as json config
236	root	1.13	file.
237	root	1.14	- introduce bin/aemp to configure nodes.
238	root	1.15	- too many changes to describe.
239	root	1.13
240	root	1.12	0.4 Sun Aug 9 18:05:49 CEST 2009
241	root	1.11	- API should now be really stable :)
242	root	1.8	- distinguish between resolved and unresolved noderefs.
243	root	1.6	- certificates in .aemp-secret are now supported.
244	root	1.9	- change port creation semantics.
245			- replace become_xxx by initialise_node.
246	root	1.10	- implement AE::MP::spawn.
247	root	1.11	- implement transport timeouts, monitoring, reconnecting.
248			- simplify and partially document the transport protocol.
249	root	1.6
250	root	1.5	0.1 Tue Aug 4 23:07:11 CEST 2009
251	root	1.6	- AnyEvent::MP API should be mostly stable by now.
252	root	1.5
253	root	1.3	0.02 Sun Aug 2 17:46:43 CEST 2009
254			- design has stabilised a bit, sitll unusable.
255
256	root	1.2	0.01 Sat Aug 1 11:43:31 CEST 2009
257			- dummy upload to reserve namespace on CPAN.
258
259	root	1.1	0.0 Thu Jul 30 06:10:15 CEST 2009
260			- original version, an AnyEvent::AIO clone.