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cosmopolitan/examples/greenbean.c

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Add high performance threaded webserver example
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/sigbits.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timeval.h"
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#include "libc/dce.h"
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#include "libc/fmt/itoa.h"
#include "libc/intrin/kprintf.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
#include "libc/mem/mem.h"
#include "libc/sock/goodsocket.internal.h"
#include "libc/sock/sock.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/af.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/consts/clone.h"
#include "libc/sysv/consts/ipproto.h"
#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/rlimit.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/consts/so.h"
#include "libc/sysv/consts/sock.h"
#include "libc/sysv/consts/sol.h"
#include "libc/sysv/consts/tcp.h"
#include "libc/time/struct/tm.h"
#include "libc/time/time.h"
#include "net/http/http.h"
#include "net/http/url.h"
/**
* @fileoverview greenbean lightweighht threaded web server
*
* $ make -j8 o//tool/net/greenbean.com
* $ o//tool/net/greenbean.com &
* $ printf 'GET /\n\n' | nc 127.0.0.1 8080
* HTTP/1.1 200 OK
* Server: greenbean/1.o
* Referrer-Policy: origin
* Cache-Control: private; max-age=0
* Content-Type: text/html; charset=utf-8
* Date: Sat, 14 May 2022 14:13:07 GMT
* Content-Length: 118
*
* <!doctype html>
* <title>hello world</title>
* <h1>hello world</h1>
* <p>this is a fun webpage
* <p>hosted by greenbean
*
* Like redbean, greenbean has superior performance too, with an
* advantage on benchmarks biased towards high connection counts
*
* $ sudo wrk -c 300 -t 32 --latency http://127.0.0.1:8080/
* Running 10s test @ http://127.0.0.1:8080/
* 32 threads and 300 connections
* Thread Stats Avg Stdev Max +/- Stdev
* Latency 36.21us 133.39us 8.10ms 98.52%
* Req/Sec 73.24k 28.92k 131.06k 47.49%
* Latency Distribution
* 50% 22.00us
* 75% 29.00us
* 90% 40.00us
* 99% 333.00us
* 4356560 requests in 4.62s, 1.29GB read
* Requests/sec: 942663.73
* Transfer/sec: 284.98MB
*
*/
#define THREADS 32
#define HEARTBEAT 500
#define KEEPALIVE 5000
#define LOGGING 0
#define STANDARD_RESPONSE_HEADERS \
"Server: greenbean/1.o\r\n" \
"Referrer-Policy: origin\r\n" \
"Cache-Control: private; max-age=0\r\n"
int workers;
int barrier;
int closingtime;
int Worker(void *id) {
int server, itsover, ready, yes = 1;
// announce to the main process this has spawned
kprintf(" #%.2ld", (intptr_t)id);
__atomic_add_fetch(&workers, 1, __ATOMIC_SEQ_CST);
// wait for all threads to spawn before we proceed
for (;;) {
__atomic_load(&barrier, &ready, __ATOMIC_SEQ_CST);
if (ready) break;
__builtin_ia32_pause();
}
// load balance incoming connections for port 8080 across all threads
// hangup on any browser clients that lag for more than a few seconds
struct timeval timeo = {KEEPALIVE / 1000, KEEPALIVE % 1000};
struct sockaddr_in addr = {.sin_family = AF_INET, .sin_port = htons(8080)};
CHECK_NE(-1, (server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)));
setsockopt(server, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));
setsockopt(server, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
setsockopt(server, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes));
setsockopt(server, SOL_TCP, TCP_FASTOPEN, &yes, sizeof(yes));
setsockopt(server, SOL_TCP, TCP_QUICKACK, &yes, sizeof(yes));
CHECK_EQ(0, bind(server, &addr, sizeof(addr)));
CHECK_EQ(0, listen(server, 10));
// connection loop
for (;;) {
struct tm tm;
int64_t unixts;
struct Url url;
ssize_t got, sent;
struct timespec ts;
struct HttpMessage msg;
uint32_t clientaddrsize;
struct sockaddr_in clientaddr;
char inbuf[1500], outbuf[512], *p, *q;
int clientip, client, inmsglen, outmsglen;
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__atomic_load(&closingtime, &itsover, __ATOMIC_SEQ_CST);
if (itsover) break;
if (!IsLinux() &&
poll(&(struct pollfd){server, POLLIN}, 1, HEARTBEAT) < 1) {
continue;
}
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// wait for client connection
clientaddrsize = sizeof(clientaddr);
client = accept(server, &clientaddr, &clientaddrsize);
// accept() can raise a very diverse number of errors but none of
// them are really true showstoppers that would necessitate us to
// panic and abort the entire server, so we can just ignore these
if (client == -1) {
// we used SO_RCVTIMEO and SO_SNDTIMEO because those settings are
// inherited by the accepted sockets, but using them also has the
// side-effect that the listening socket fails with EAGAIN, every
// several seconds. we can use that to our advantage to check for
// the ctrl-c shutdown event; otherwise, we retry the accept call
continue;
}
// message loop
do {
// parse the incoming http message
InitHttpMessage(&msg, kHttpRequest);
// we're not terrible concerned when errors happen here
if ((got = read(client, inbuf, sizeof(inbuf))) <= 0) break;
// check that client message wasn't fragmented into more reads
if (!(inmsglen = ParseHttpMessage(&msg, inbuf, got))) break;
#if LOGGING
// log the incoming http message
clientip = ntohl(clientaddr.sin_addr.s_addr);
kprintf("#%.2ld get some %d.%d.%d.%d:%d %#.*s\n", (intptr_t)id,
(clientip & 0xff000000) >> 030, (clientip & 0x00ff0000) >> 020,
(clientip & 0x0000ff00) >> 010, (clientip & 0x000000ff) >> 000,
ntohs(clientaddr.sin_port), msg.uri.b - msg.uri.a,
inbuf + msg.uri.a);
#endif
// display hello world html page for http://127.0.0.1:8080/
if (msg.method == kHttpGet &&
(msg.uri.b - msg.uri.a == 1 && inbuf[msg.uri.a + 0] == '/')) {
q = "<!doctype html>\r\n"
"<title>hello world</title>\r\n"
"<h1>hello world</h1>\r\n"
"<p>this is a fun webpage\r\n"
"<p>hosted by greenbean\r\n";
p = stpcpy(outbuf, "HTTP/1.1 200 OK\r\n" STANDARD_RESPONSE_HEADERS
"Content-Type: text/html; charset=utf-8\r\n"
"Date: ");
clock_gettime(CLOCK_REALTIME, &ts), unixts = ts.tv_sec;
p = FormatHttpDateTime(p, gmtime_r(&unixts, &tm));
p = stpcpy(p, "\r\nContent-Length: ");
p = FormatInt32(p, strlen(q));
p = stpcpy(p, "\r\n\r\n");
p = stpcpy(p, q);
outmsglen = p - outbuf;
sent = write(client, outbuf, outmsglen);
} else {
// display 404 not found error page for every thing else
q = "<!doctype html>\r\n"
"<title>404 not found</title>\r\n"
"<h1>404 not found</h1>\r\n";
p = stpcpy(outbuf,
"HTTP/1.1 404 Not Found\r\n" STANDARD_RESPONSE_HEADERS
"Content-Type: text/html; charset=utf-8\r\n"
"Date: ");
clock_gettime(CLOCK_REALTIME, &ts), unixts = ts.tv_sec;
p = FormatHttpDateTime(p, gmtime_r(&unixts, &tm));
p = stpcpy(p, "\r\nContent-Length: ");
p = FormatInt32(p, strlen(q));
p = stpcpy(p, "\r\n\r\n");
p = stpcpy(p, q);
outmsglen = p - outbuf;
sent = write(client, outbuf, p - outbuf);
}
// if the client isn't pipelining and write() wrote the full
// amount, then since we sent the content length and checked
// that the client didn't attach a payload, we are so synced
// thus we can safely process more messages
} while (got == inmsglen && sent == outmsglen &&
!msg.headers[kHttpContentLength].a &&
!msg.headers[kHttpTransferEncoding].a &&
(msg.method == kHttpGet || msg.method == kHttpHead));
DestroyHttpMessage(&msg);
close(client);
}
// inform the parent that this clone has finished
close(server);
kprintf(" #%.2ld", (intptr_t)id);
__atomic_sub_fetch(&workers, 1, __ATOMIC_SEQ_CST);
return 0;
}
void OnCtrlC(int sig) {
closingtime = true;
}
int main(int argc, char *argv[]) {
int64_t loadtzdbearly;
int i, gotsome, haveleft, ready = 1;
ShowCrashReports();
kprintf("welcome to greenbean\n");
gmtime(&loadtzdbearly);
// spawn a bunch of threads
for (i = 0; i < THREADS; ++i) {
void *stack = mmap(0, 65536, PROT_READ | PROT_WRITE,
MAP_STACK | MAP_ANONYMOUS, -1, 0);
clone(Worker, stack, 65536,
CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,
(void *)(intptr_t)i, 0, 0, 0, 0);
}
// wait for all threads to spawn
for (;;) {
__atomic_load(&workers, &gotsome, __ATOMIC_SEQ_CST);
if (workers == THREADS) break;
__builtin_ia32_pause();
}
// all threads are spawned so unleash the barrier
kprintf("\ngreenbean is ready to go\n");
sigaction(SIGINT, &(struct sigaction){.sa_handler = OnCtrlC}, 0);
__atomic_store(&barrier, &ready, __ATOMIC_SEQ_CST);
// main process does nothing until it's closing time
for (;;) {
__atomic_load(&workers, &haveleft, __ATOMIC_SEQ_CST);
if (!haveleft) break;
__builtin_ia32_pause();
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usleep(HEARTBEAT * 1000);
if (closingtime) {
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kprintf("\rgreenbean is shutting down...\n");
}
}
kprintf("\n");
kprintf("thank you for flying greenbean\n");
}
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