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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
99 lines
4.2 KiB
C
99 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/atomic.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/limits.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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#include "net/http/http.h"
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#include "net/http/tokenbucket.h"
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#define TB_CIDR 22
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#define TB_BYTES (1u << TB_CIDR)
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#define TB_WORDS (TB_BYTES / 8)
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union TokenBucket {
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atomic_schar *b;
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atomic_uint_fast64_t *w;
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} tok;
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void SetUp(void) {
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ASSERT_NE(NULL, (tok.b = calloc(TB_BYTES, 1)));
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}
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void TearDown(void) {
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free(tok.b);
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}
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TEST(tokenbucket, test) {
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ASSERT_EQ(0, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ASSERT_EQ(0, AcquireToken(tok.b, 0x7f000002, TB_CIDR));
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ReplenishTokens(tok.w, TB_WORDS);
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ReplenishTokens(tok.w, TB_WORDS);
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ASSERT_EQ(2, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ASSERT_EQ(1, AcquireToken(tok.b, 0x7f000002, TB_CIDR));
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ASSERT_EQ(0, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ASSERT_EQ(0, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ASSERT_EQ(2, AcquireToken(tok.b, 0x08080808, TB_CIDR));
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ReplenishTokens(tok.w, TB_WORDS);
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ASSERT_EQ(1, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ReplenishTokens(tok.w, TB_WORDS);
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ASSERT_EQ(1, AcquireToken(tok.b, 0x7f000001, TB_CIDR));
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ASSERT_EQ(0, AcquireToken(tok.b, 0x7f000002, TB_CIDR));
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ASSERT_EQ(3, AcquireToken(tok.b, 0x08080808, TB_CIDR));
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for (int i = 0; i < 130; ++i) ReplenishTokens(tok.w, TB_WORDS);
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ASSERT_EQ(127, AcquireToken(tok.b, 0x08080808, TB_CIDR));
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}
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void NaiveReplenishTokens(atomic_schar *b, size_t n) {
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for (size_t i = 0; i < n; ++i) {
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int x = atomic_load_explicit(b + i, memory_order_relaxed);
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if (x == 127) continue;
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atomic_fetch_add_explicit(b + i, 1, memory_order_acq_rel);
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}
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}
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BENCH(tokenbucket, bench) {
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struct timespec t1, t2;
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clock_gettime(0, &t1);
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NaiveReplenishTokens(tok.b, TB_BYTES);
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clock_gettime(0, &t2);
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kprintf("NaiveReplenishTokens took %'ld us\n",
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timespec_tomicros(timespec_sub(t2, t1)));
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clock_gettime(0, &t1);
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ReplenishTokens(tok.w, TB_WORDS);
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clock_gettime(0, &t2);
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kprintf("ReplenishTokens empty took %'ld us\n",
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timespec_tomicros(timespec_sub(t2, t1)));
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memset(tok.b, 127, TB_BYTES);
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clock_gettime(0, &t1);
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ReplenishTokens(tok.w, TB_WORDS);
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clock_gettime(0, &t2);
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kprintf("ReplenishTokens full took %'ld us\n",
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timespec_tomicros(timespec_sub(t2, t1)));
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}
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