prosody
aac4c6147647
util/async.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody

Annotate

util/async.lua @ 5792:aac4c6147647

util.async: waiter: Remove restriction about wait() being called before done()
author Matthew Wild <mwild1@gmail.com>
date Mon, 12 Aug 2013 12:08:51 +0100
parent 5791:2c98061b6b1e
child 5793:e8c79796ead9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
1 local log = require "util.logger".init("util.async");
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
2
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
3 local function runner_continue(thread)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
4 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
5 if coroutine.status(thread) ~= "suspended" then -- This should suffice
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
6 return false;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
7 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
8 local ok, state, runner = coroutine.resume(thread);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
9 if not ok then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
10 local level = 0;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
11 while debug.getinfo(thread, level, "") do level = level + 1; end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
12 ok, runner = debug.getlocal(thread, level-1, 1);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
13 local error_handler = runner.watchers.error;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
14 if error_handler then error_handler(runner, debug.traceback(thread, state)); end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
15 elseif state == "ready" then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
16 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
17 -- We also have to :run(), because the queue might have further items that will not be
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
18 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
19 runner.state = "ready";
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
20 runner:run();
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
21 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
22 return true;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
23 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
24
5790
959163e4d631 util.async: Make functions local
Matthew Wild <mwild1@gmail.com>
parents: 5788
diff changeset
25 local function waiter(num)
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
26 local thread = coroutine.running();
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
27 if not thread then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
28 error("Not running in an async context, see http://prosody.im/doc/developers/async");
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
29 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
30 num = num or 1;
5792
aac4c6147647 util.async: waiter: Remove restriction about wait() being called before done()
Matthew Wild <mwild1@gmail.com>
parents: 5791
diff changeset
31 local waiting;
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
32 return function ()
5792
aac4c6147647 util.async: waiter: Remove restriction about wait() being called before done()
Matthew Wild <mwild1@gmail.com>
parents: 5791
diff changeset
33 if num == 0 then return; end -- already done
aac4c6147647 util.async: waiter: Remove restriction about wait() being called before done()
Matthew Wild <mwild1@gmail.com>
parents: 5791
diff changeset
34 waiting = true;
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
35 coroutine.yield("wait");
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
36 end, function ()
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
37 num = num - 1;
5792
aac4c6147647 util.async: waiter: Remove restriction about wait() being called before done()
Matthew Wild <mwild1@gmail.com>
parents: 5791
diff changeset
38 if num == 0 and waiting then
aac4c6147647 util.async: waiter: Remove restriction about wait() being called before done()
Matthew Wild <mwild1@gmail.com>
parents: 5791
diff changeset
39 runner_continue(thread);
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
40 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
41 end;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
42 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
43
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
44 local runner_mt = {};
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
45 runner_mt.__index = runner_mt;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
46
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
47 local function runner_create_thread(func, self)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
48 local thread = coroutine.create(function (self)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
49 while true do
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
50 func(coroutine.yield("ready", self));
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
51 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
52 end);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
53 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
54 return thread;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
55 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
56
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
57 local empty_watchers = {};
5790
959163e4d631 util.async: Make functions local
Matthew Wild <mwild1@gmail.com>
parents: 5788
diff changeset
58 local function runner(func, watchers, data)
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
59 return setmetatable({ func = func, thread = false, state = "ready", notified_state = "ready",
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
60 queue = {}, watchers = watchers or empty_watchers, data = data }
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
61 , runner_mt);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
62 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
63
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
64 function runner_mt:run(input)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
65 if input ~= nil then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
66 table.insert(self.queue, input);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
67 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
68 if self.state ~= "ready" then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
69 return true, self.state, #self.queue;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
70 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
71
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
72 local q, thread = self.queue, self.thread;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
73 if not thread or coroutine.status(thread) == "dead" then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
74 thread = runner_create_thread(self.func, self);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
75 self.thread = thread;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
76 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
77
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
78 local n, state, err = #q, self.state, nil;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
79 self.state = "running";
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
80 while n > 0 and state == "ready" do
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
81 local consumed;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
82 for i = 1,n do
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
83 local input = q[i];
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
84 local ok, new_state = coroutine.resume(thread, input);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
85 if not ok then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
86 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
87 self.thread = nil;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
88 break;
5791
2c98061b6b1e util.async: runner: Fix check for new state to recognise transition to 'waiting'
Matthew Wild <mwild1@gmail.com>
parents: 5790
diff changeset
89 elseif new_state == "wait" then
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
90 consumed, state = i, "waiting";
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
91 break;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
92 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
93 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
94 if not consumed then consumed = n; end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
95 if q[n+1] ~= nil then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
96 n = #q;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
97 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
98 for i = 1, n do
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
99 q[i] = q[consumed+i];
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
100 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
101 n = #q;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
102 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
103 self.state = state;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
104 if state ~= self.notified_state then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
105 self.notified_state = state;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
106 local handler = self.watchers[state];
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
107 if handler then handler(self, err); end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
108 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
109 return true, state, n;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
110 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
111
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
112 function runner_mt:enqueue(input)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
113 table.insert(self.queue, input);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
114 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
115
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
116 return { waiter = waiter, runner = runner };