108 lines
4.5 KiB
C
108 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/calls/calls.h"
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#include "libc/macros.h"
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#include "libc/math.h"
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#include "libc/sock/sock.h"
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#include "libc/sysv/consts/poll.h"
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#include "libc/sysv/consts/shut.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/time.h"
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#include "net/http/http.h"
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static pureconst long AsMilliseconds(long double ts) {
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return ts * 1e3 + .5;
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}
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/**
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* Negotiates HTTP request.
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*
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* This function blocks until a response header is consumed. We assume
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* the response header is smaller than *inout_respsize. We're agnostic
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* to the various different i/o paradigms. Goal is really good latency.
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*
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* @param singleshot should be true w/ connection: close
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* @return 0 on success, or -1 w/ errno
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*/
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int NegotiateHttpRequest(int sock, const char *req, uint32_t *inout_reqsize,
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char *resp, uint32_t *inout_respsize,
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uint32_t *out_resphdrsize, bool singleshot,
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long double timeout) {
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ssize_t rc;
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struct pollfd fd;
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const char *body;
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long double start, now, deadline;
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uint32_t transmitted, received, exchanged, remaining;
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fd.fd = sock;
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received = 0;
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transmitted = 0;
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fd.events = POLLOUT | POLLIN;
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deadline = (start = now = nowl()) + timeout;
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do {
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if ((rc = poll(&fd, 1, MAX(0, AsMilliseconds(deadline - now)))) == 1) {
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if (fd.revents & POLLHUP) {
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econnreset();
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break;
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}
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if (fd.revents & (POLLIN | POLLERR)) {
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remaining = *inout_respsize - received - 1;
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if ((rc = recv(fd.fd, resp + received, remaining, 0)) != -1) {
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exchanged = rc;
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body = memmem(resp + (received >= 4 ? received - 4 : 0), exchanged,
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"\r\n\r\n", 4);
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received += exchanged;
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if (body) {
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resp[received] = '\0';
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*inout_respsize = received;
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*inout_reqsize = transmitted;
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*out_resphdrsize = body - resp;
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return 0;
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}
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if (exchanged == remaining) {
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emsgsize();
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break;
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}
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} else {
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break;
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}
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}
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if (fd.revents & POLLOUT) {
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remaining = *inout_reqsize - transmitted;
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if ((rc = send(fd.fd, req + transmitted, remaining, 0)) != -1) {
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exchanged = rc;
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transmitted += exchanged;
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if (exchanged == remaining) {
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if (singleshot) shutdown(fd.fd, SHUT_WR);
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fd.events &= ~POLLOUT;
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}
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} else {
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break;
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}
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}
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} else {
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if (!rc) etimedout();
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break;
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}
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} while ((now = nowl()) < deadline);
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close(fd.fd);
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return -1;
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}
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