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MINOR: debug: add CLI command "debug dev write" to write an arbitrary size

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This command is used to produce an arbitrary amount of data on the
output. It can be used to test the CLI's state machine as well as
the internal parts related to applets an I/O. A typical test consists
in asking for all sizes from 0 to 16384:

  $ (echo "prompt;expert-mode on";for i in {0..16384}; do
     echo "debug dev write $i"; done) | socat - /tmp/sock1 | wc -c
  134258738

A better test would consist in first waiting for the response before
sending a new request.

This command is not restricted to the admin since it's harmless.
This commit is contained in:
Willy Tarreau 2020-03-05 17:16:24 +01:00
parent d04a2a6654
commit 6cbe62b858
1 changed files with 24 additions and 0 deletions
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24
src/debug.c
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@ -497,6 +497,29 @@ static int debug_parse_cli_tkill(char **args, char *payload, struct appctx *appc
return 1;
}
/* parse a "debug dev write" command. It always returns 1. */
static int debug_parse_cli_write(char **args, char *payload, struct appctx *appctx, void *private)
{
unsigned long len;
if (!*args[3])
return cli_err(appctx, "Missing output size.\n");
len = strtoul(args[3], NULL, 0);
if (len >= trash.size)
return cli_err(appctx, "Output too large, must be <tune.bufsize.\n");
_HA_ATOMIC_ADD(&debug_commands_issued, 1);
chunk_reset(&trash);
trash.data = len;
memset(trash.area, '.', trash.data);
trash.area[trash.data] = 0;
for (len = 64; len < trash.data; len += 64)
trash.area[len] = '\n';
return cli_msg(appctx, LOG_INFO, trash.area);
}
/* parse a "debug dev stream" command */
/*
* debug dev stream [strm=<ptr>] [strm.f[{+-=}<flags>]] [txn.f[{+-=}<flags>]] \
@ -795,6 +818,7 @@ static struct cli_kw_list cli_kws = {{ },{
{{ "debug", "dev", "panic", NULL }, "debug dev panic : immediately trigger a panic", debug_parse_cli_panic, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "stream",NULL }, "debug dev stream ... : show/manipulate stream flags", debug_parse_cli_stream,NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "tkill", NULL }, "debug dev tkill [thr] [sig] : send signal to thread", debug_parse_cli_tkill, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "debug", "dev", "write", NULL }, "debug dev write [size] : write that many bytes", debug_parse_cli_write, NULL, NULL, NULL, ACCESS_EXPERT },
{{ "show", "threads", NULL, NULL }, "show threads : show some threads debugging information", NULL, cli_io_handler_show_threads, NULL },
{{},}
}};