-
Notifications
You must be signed in to change notification settings - Fork 10
/
voter.erl
404 lines (343 loc) · 19.6 KB
/
voter.erl
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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
%%%-------------------------------------------------------------------------%%%
%%% File : examples/voter.erl %%%
%%% Version : 0.3/beta %%%
%%% Description : Erlang VoltDB driver VoltDB staple 'Voter' example %%%
%%% Copyright : VoltDB, LLC - http://www.voltdb.com %%%
%%% Production : Eonblast Corporation - http://www.eonblast.com %%%
%%% Author : H. Diedrich <hd2012@eonblast.com> %%%
%%% License : MIT %%%
%%% Created : 30 Jan 2013 %%%
%%% Changed : 02 Feb 2013 %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% This driver is being contributed to VoltDB by Eonblast Corporation. %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% Erlvolt 0.3/beta - Erlang VoltDB client API. %%%
%%% %%%
%%% This file is part of VoltDB. %%%
%%% Copyright (C) 2008-2013 VoltDB, LLC http://www.voltdb.com %%%
%%% Author H. Diedrich <hd2012@eonblast.com> http://www.eonblast.com %%%
%%% %%%
%%% Permission is hereby granted, free of charge, to any person obtaining %%%
%%% a copy of this software and associated documentation files (the %%%
%%% "Software"), to deal in the Software without restriction, including %%%
%%% without limitation the rights to use, copy, modify, merge, publish, %%%
%%% distribute, sublicense, and/or sell copies of the Software, and to %%%
%%% permit persons to whom the Software is furnished to do so, subject to %%%
%%% the following conditions: %%%
%%% %%%
%%% The above copyright notice and this permission notice shall be %%%
%%% included in all copies or substantial portions of the Software. %%%
%%% %%%
%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, %%%
%%% EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF %%%
%%% MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. %%%
%%% IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR %%%
%%% OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, %%%
%%% ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR %%%
%%% OTHER DEALINGS IN THE SOFTWARE. %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% USAGE %%%
%%% %%%
%%% You can run this sample using the 'Voter' tutorial-server discussed %%%
%%% that is present in every VoltDB distribution. For an explanation of %%%
%%% the 'TV voter' scenario, see comments below. %%%
%%% %%%
%%% To try it, start that server from your voltdb installation with: %%%
%%% %%%
%%% $ cd voltdb/examples/voter %%%
%%% $ ./run.sh %%%
%%% %%%
%%% Then, in a different terminal, from the driver root: %%%
%%% %%%
%%% $ make voter %%%
%%% or %%%
%%% $ make %%%
%%% $ cd examples %%%
%%% $ erlc -I ../include -o ../ebin +debug_info voter.erl %%%
%%% $ erl -pa ../ebin -s voter run -s init stop -noshell %%%
%%% %%%
%%% You will see this response, listing parameters and voting results: %%%
%%% %%%
%%% Voter Sample %%%
%%% ---------------------------------------------------------------- %%%
%%% Hosts: localhost:21212 %%%
%%% username: "user" %%%
%%% password: "password" %%%
%%% database: "database" %%%
%%% queue_size: 100000 %%%
%%% slots: 100 %%%
%%% nagle: true %%%
%%% send_buffer: 10000 %%%
%%% receive_buffer: 100000 %%%
%%% send_timeout: 10000 %%%
%%% %%%
%%% calls ... %%%
%%% cool down ... %%%
%%% done ... %%%
%%% ---------------------------------------------------------------- %%%
%%% votes: 10000 (6 contestants) %%%
%%% .......Jessie Eichman: 1692 %%%
%%% .......Jessie Alloway: 1678 %%%
%%% ........Alana Bregman: 1673 %%%
%%% ........Edwina Burnam: 1671 %%%
%%% .........Kelly Clauss: 1645 %%%
%%% ......Tabatha Gehling: 1641 %%%
%%% ---------------------------------------------------------------- %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% For a barebones 'hello world' see examples/hello.erl. %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% See README.md or .html for instructions, examples/ for more examples. %%%
%%% See doc/BENCHMARKS.md or .html for a description of driver benchmarks. %%%
%%% %%%
%%% For getting started with VoltDB,see: voltdb/doc/GettingStarted.pdf or %%%
%%% online: http://voltdb.com/downloads/documentation/GettingStarted.pdf. %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
%%% %%%
%%% VOTER - DESCRIPTION %%%
%%% %%%
%%% The Voter example application simulates a phone based election process. %%%
%%% Voters (based on phone numbers generated randomly by the client %%%
%%% application) are allowed a limited number of votes. %%%
%%% %%%
%%% The main goal of the voter application is to demonstrate the %%%
%%% performance possibilities of VoltDB: %%%
%%% %%%
%%% - Stored procedures are invoked asynchronously. - The client %%%
%%% can record and report thoughput and latency, when compiled with %%%
%%% the driver-built in profiler (`make clean profile`). %%%
%%% %%%
%%% Usually you will run this sample on a single node. However, it can %%%
%%% easily be reconfigured to run any combination of clients and servers. %%%
%%% The servers support multiple clients at one time - Single node or %%%
%%% multi-node clusters are supported %%%
%%% %%%
%%% To test the server with a different configuration, simply edit %%%
%%% run.sh, listing one server node as the lead node when building the %%%
%%% catalog and using a comma-separated list of the server addresses as %%%
%%% an argument to the client. See the comments in the build script for %%%
%%% details. %%%
%%% %%%
%%% The client starts "fire-hosing" the VoltDB server using pre-set %%%
%%% parameters. You can experiment with different loads to better %%%
%%% understand the best tuning to get the most out of your specific %%%
%%% VoltDB deployment. %%%
%%% %%%
%%% Rate-limiting your clients (or adding cluster nodes) is essential to %%%
%%% preventing "fire-hosing" your server (cluster) and will ensure you %%%
%%% get proper application responsiveness (latency) while maximizing %%%
%%% througput (TPS) for your hardware configuration. %%%
%%% %%%
%%% The "Voter" application is specifically designed for benchmarking to %%%
%%% give you a good feel for the type of performance VoltDB is capable %%%
%%% of on your hardware. %%%
%%% %%%
%%% For more on benchmarking and tips on application tuning, visit the %%%
%%% VoltDB blog: http://voltdb.com/search/node/benchmark and %%%
%%% - http://voltdb.com/search/node/tuning %%%
%%% %%%
%%%-------------------------------------------------------------------------%%%
-module(voter).
-export([run/0, run/1,
prep_voter/1, vote/1, voter_return_text/1]).
-include("erlvolt.hrl").
%% Voter return values
-define(VOTE_SUCCESSFUL, 0).
-define(ERR_INVALID_CONTESTANT, 1).
-define(ERR_VOTER_OVER_VOTE_LIMIT, 2).
-define(SEP, "-----------------------------------------------------------------------~n").
%%%----------------------------------------------------------------------------
%%% Voter Sample Start Function
%%%----------------------------------------------------------------------------
%% @spec run() -> any().
run() ->
run(['10000']).
%% @spec run([ACallCount]) -> ok.
%% ACallCount = atom()
run([ACallCount]) ->
%% Cast from command line atoms and verify
io:format("~n~nVoter Sample~n"),
io:format(?SEP),
crypto:start(),
application:start(erlvolt),
CallCount = list_to_integer(atom_to_list(ACallCount)),
Hosts = [{"localhost", 21212}],
%% Note: these are pretty much the default values, shown
%% here explicitly to give an idea of the set of options.
Opts = [{username, "user"},
{password, "password"},
{database, "database"},
{queue_size, 100000},
{slots, 100},
{nagle, true},
{send_buffer, 10000},
{receive_buffer, 100000},
{send_timeout, 10000}],
POpts = [ io_lib:format("~14.s: ~p~n", [Key, Value]) || {Key, Value} <- Opts ],
io:format(" Hosts: ~s~n", [[D++":"++integer_to_list(P)++" "||{D,P}<-Hosts]]),
io:format("~s~n", [POpts]),
try
%%%
%%% Connect to the database
%%%
erlvolt:add_pool(mypool, Hosts, Opts),
%%%
%%% Load sample data into the database
%%%
prep_voter(mypool),
%%%
%%% Measure
%%%
io:format("calls ... ~n"),
[ spawn(?MODULE, vote, [mypool]) || _ <- lists:seq(1,CallCount) ],
%%%
%%% Wait for last responses
%%%
io:format("cool down ... ~n"),
erlvolt:drain_pool(mypool),
io:format("done ... ~n"),
%%%
%%% Show results
%%%
C = query_contestants(mypool),
V = query_votes(mypool),
io:format(?SEP),
io:format("votes: ~p (~p contestants)~n", [V, C]),
Result = erlvolt:call_procedure(mypool, "Results", []),
dump(Result),
io:format(?SEP),
?ERLVOLT_PROFILER_COUNT_SUCCESS(),
%%%
%%% Shut Down
%%%
erlvolt:close_pool(mypool)
catch
throw:{ connection_failed, _}=_Why ->
io:format("~n------------------------------------------------------------------------------------~n"),
io:format("Failed to open server connection.~nIs the VoltDB server running and accessible?"),
io:format("~n------------------------------------------------------------------------------------~n");
What:Why ->
io:format("~n ~w ~w ~n ~p", [What, Why, erlang:get_stacktrace()]),
exit({What, Why})
end.
%% @spec prep_voter(mypool) -> ok
prep_voter(mypool) ->
%% Seed pseduo random generator
{A1,A2,A3} = now(),
random:seed(A1, A2, A3),
%% Initialize the database
Result = erlvolt:call_procedure(mypool, "Initialize", [6,voter_candidates()]),
try
{result, {voltresponse, {0,<<0,0,_,0,0,0,0,0>>,1,<<>>,128,<<>>,<<>>,_}, [{volttable,[<<>>],[6],[{voltrow,[6]}]}]}} = Result
catch
error:{badmatch,_} ->
case erlvolt:get_statusstring(Result) of
<<"Procedure Initialize was not found">> ->
io:format("### Calling stored procedure 'Initialize' failed. Right database running? ###~n"),
exit(cant_initialize);
Status ->
io:format("### Calling stored procedure 'Initialize' failed: ~p~n",[Status])
end
end,
?ERLVOLT_PROFILER_COUNT_SUCCESS(0),
ok.
%% Names of candidates.
%% @spec voter_candidates() -> string()
voter_candidates() ->
"Edwina Burnam,Tabatha Gehling,Kelly Clauss," ++
"Jessie Alloway,Alana Bregman,Jessie Eichman,Allie Rogalski,Nita Coster," ++
"Kurt Walser,Ericka Dieter,Loraine NygrenTania Mattioli".
%% Get a pseudo random candidate number
%% @spec voter_get_candidate() -> 1..6
voter_get_candidate() ->
{A1,A2,A3} = now(),
random:seed(A1, A2, A3),
random:uniform(6).
%% List of Area Codes.
%% @spec voter_area_codes() -> list()
voter_area_codes() ->
[907, 205, 256, 334, 251, 870, 501, 479, 480, 602, 623, 928,
520, 341, 764, 628, 831, 925, 909, 562, 661, 510, 650, 949, 760, 415, 951, 209,
669, 408, 559, 626, 442, 530, 916, 627, 714, 707, 310, 323, 213, 424, 747, 818,
858, 935, 619, 805, 369, 720, 303, 970, 719, 860, 203, 959, 475, 202, 302, 689,
407, 239, 850, 727, 321, 754, 954, 927, 352, 863, 386, 904, 561, 772, 786, 305,
941, 813, 478, 770, 470, 404, 762, 706, 678, 912, 229, 808, 515, 319, 563, 641,
712, 208, 217, 872, 312, 773, 464, 708, 224, 847, 779, 815, 618, 309, 331, 630,
317, 765, 574, 260, 219, 812, 913, 785, 316, 620, 606, 859, 502, 270, 504, 985,
225, 318, 337, 774, 508, 339, 781, 857, 617, 978, 351, 413, 443, 410, 301, 240,
207, 517, 810, 278, 679, 313, 586, 947, 248, 734, 269, 989, 906, 616, 231, 612,
320, 651, 763, 952, 218, 507, 636, 660, 975, 816, 573, 314, 557, 417, 769, 601,
662, 228, 406, 336, 252, 984, 919, 980, 910, 828, 704, 701, 402, 308, 603, 908,
848, 732, 551, 201, 862, 973, 609, 856, 575, 957, 505, 775, 702, 315, 518, 646,
347, 212, 718, 516, 917, 845, 631, 716, 585, 607, 914, 216, 330, 234, 567, 419,
440, 380, 740, 614, 283, 513, 937, 918, 580, 405, 503, 541, 971, 814, 717, 570,
878, 835, 484, 610, 267, 215, 724, 412, 401, 843, 864, 803, 605, 423, 865, 931,
615, 901, 731, 254, 325, 713, 940, 817, 430, 903, 806, 737, 512, 361, 210, 979,
936, 409, 972, 469, 214, 682, 832, 281, 830, 956, 432, 915, 435, 801, 385, 434,
804, 757, 703, 571, 276, 236, 540, 802, 509, 360, 564, 206, 425, 253, 715, 920,
262, 414, 608, 304, 307].
%% Get pseudo randomly one of the area codes
%% @spec voter_get_phone() -> 2050000000..9079999999.
voter_get_phone() ->
lists:nth(random:uniform(305), voter_area_codes()) * 10000000 + random:uniform(9999999).
%% @spec call_voter(Link) -> ok.
%% Link = mypool::any() | {_ConnList::list(), _Round:integer()}
vote(Link) ->
Candidate = voter_get_candidate(),
Phone = voter_get_phone(),
Result = (catch erlvolt:call_procedure(Link, "Vote", [Phone, Candidate, 1000000000])),
case Result of
%% empty result (not expected)
{result, { voltresponse, _Response, []}} = Result ->
?ERLVOLT_PROFILER_COUNT_FAILURE(),
io:format("RECEIVED EMPTY RESPONSE"),
io:format("Voter client received unexpected result: ~p~n", [Result]),
exit(voter_unexpected_empty_response);
%% good result
{result, { voltresponse, _, [ _Table | _ ] }} = _Result ->
% ...
_Time = erlvolt_wire:roundtrip(_Result),
?ERLVOLT_PROFILER_COUNT_SUCCESS(_Time);
%% drop for full queue
queue_full ->
io:format("DROPPING FOR FULL QUEUE");
%% drop for dull queue
queue_timeout ->
io:format("DROPPING FOR QUEUE WAIT TIMEOUT");
%% unexpected other result
Other ->
?ERLVOLT_PROFILER_COUNT_FAILURE(),
io:format("RECEIVED UNEXPECTED RESPONSE"),
io:format("Voter client received unexpected result: ~p.", [Other]),
exit(voter_bad_result)
end.
voter_return_text(?VOTE_SUCCESSFUL) -> "vote successful";
voter_return_text(?ERR_INVALID_CONTESTANT) -> "invalid contestant";
voter_return_text(?ERR_VOTER_OVER_VOTE_LIMIT) -> "voter over vote limit".
query_contestants(mypool) ->
Result = erlvolt:call_procedure(mypool, "@AdHoc", ["select COUNT(*) as C from contestants"]),
{result, { voltresponse, _, [ Table | _ ] }} = Result,
Row = erlvolt:get_row(Table, 1),
Count = erlvolt:get_integer(Row, Table, "C"),
?ERLVOLT_PROFILER_COUNT_SUCCESS(),
Count.
query_votes(mypool) ->
Result = erlvolt:call_procedure(mypool, "@AdHoc", ["select COUNT(*) as C from votes"]),
{result, { voltresponse, _, [ Table | _ ] }} = Result,
Row = erlvolt:get_row(Table, 1),
Count = erlvolt:get_integer(Row, Table, "C"),
?ERLVOLT_PROFILER_COUNT_SUCCESS(),
Count.
dump( {result, {voltresponse,_,Tables}}) ->
[ dump(T) || T <- Tables ];
dump({ volttable, _, _, Rows }) ->
[ io:format("~21...s: ~7w~n",[Name, Votes]) || {voltrow, [Name, _, Votes]} <- Rows ].