| 1 | /*- |
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| 2 | * Copyright (c) 2006 Verdens Gang AS |
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| 3 | * Copyright (c) 2006-2010 Redpill Linpro AS |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Author: Poul-Henning Kamp <phk@phk.freebsd.dk> |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | * |
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| 29 | */ |
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| 30 | |
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| 31 | #include "config.h" |
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| 32 | |
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| 33 | #include "svnid.h" |
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| 34 | SVNID("$Id$") |
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| 35 | |
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| 36 | #include <stdio.h> |
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| 37 | #include <errno.h> |
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| 38 | #include <poll.h> |
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| 39 | #include <string.h> |
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| 40 | #include <stdlib.h> |
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| 41 | #include <unistd.h> |
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| 42 | |
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| 43 | #include <sys/uio.h> |
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| 44 | #include <sys/types.h> |
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| 45 | #include <sys/socket.h> |
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| 46 | |
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| 47 | #include "cli.h" |
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| 48 | #include "cli_priv.h" |
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| 49 | #include "shmlog.h" |
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| 50 | #include "cache.h" |
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| 51 | #include "cache_waiter.h" |
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| 52 | |
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| 53 | static struct waiter * const vca_waiters[] = { |
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| 54 | #if defined(HAVE_KQUEUE) |
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| 55 | &waiter_kqueue, |
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| 56 | #endif |
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| 57 | #if defined(HAVE_EPOLL_CTL) |
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| 58 | &waiter_epoll, |
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| 59 | #endif |
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| 60 | #if defined(HAVE_PORT_CREATE) |
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| 61 | &waiter_ports, |
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| 62 | #endif |
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| 63 | &waiter_poll, |
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| 64 | NULL, |
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| 65 | }; |
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| 66 | |
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| 67 | static struct waiter const *vca_act; |
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| 68 | |
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| 69 | pthread_t VCA_thread; |
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| 70 | static struct timeval tv_sndtimeo; |
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| 71 | static struct timeval tv_rcvtimeo; |
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| 72 | |
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| 73 | /*-------------------------------------------------------------------- |
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| 74 | * Report waiter name to panics |
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| 75 | */ |
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| 76 | |
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| 77 | const char * |
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| 78 | VCA_waiter_name(void) |
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| 79 | { |
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| 80 | |
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| 81 | if (vca_act != NULL) |
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| 82 | return (vca_act->name); |
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| 83 | else |
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| 84 | return ("no_waiter"); |
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| 85 | } |
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| 86 | |
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| 87 | |
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| 88 | /*-------------------------------------------------------------------- |
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| 89 | * We want to get out of any kind of touble-hit TCP connections as fast |
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| 90 | * as absolutely possible, so we set them LINGER enabled with zero timeout, |
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| 91 | * so that even if there are outstanding write data on the socket, a close(2) |
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| 92 | * will return immediately. |
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| 93 | */ |
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| 94 | static const struct linger linger = { |
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| 95 | .l_onoff = 1, |
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| 96 | }; |
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| 97 | |
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| 98 | static unsigned char need_sndtimeo, need_rcvtimeo, need_linger, need_test; |
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| 99 | |
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| 100 | int vca_pipes[2] = { -1, -1 }; |
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| 101 | |
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| 102 | static void |
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| 103 | sock_test(int fd) |
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| 104 | { |
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| 105 | struct linger lin; |
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| 106 | struct timeval tv; |
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| 107 | socklen_t l; |
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| 108 | |
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| 109 | l = sizeof lin; |
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| 110 | AZ(getsockopt(fd, SOL_SOCKET, SO_LINGER, &lin, &l)); |
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| 111 | assert(l == sizeof lin); |
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| 112 | if (memcmp(&lin, &linger, l)) |
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| 113 | need_linger = 1; |
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| 114 | |
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| 115 | #ifdef SO_SNDTIMEO_WORKS |
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| 116 | l = sizeof tv; |
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| 117 | AZ(getsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, &l)); |
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| 118 | assert(l == sizeof tv); |
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| 119 | if (memcmp(&tv, &tv_sndtimeo, l)) |
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| 120 | need_sndtimeo = 1; |
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| 121 | #else |
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| 122 | (void)tv; |
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| 123 | (void)tv_sndtimeo; |
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| 124 | (void)need_sndtimeo; |
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| 125 | #endif |
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| 126 | |
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| 127 | #ifdef SO_RCVTIMEO_WORKS |
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| 128 | l = sizeof tv; |
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| 129 | AZ(getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, &l)); |
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| 130 | assert(l == sizeof tv); |
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| 131 | if (memcmp(&tv, &tv_rcvtimeo, l)) |
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| 132 | need_rcvtimeo = 1; |
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| 133 | #else |
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| 134 | (void)tv; |
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| 135 | (void)tv_rcvtimeo; |
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| 136 | (void)need_rcvtimeo; |
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| 137 | #endif |
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| 138 | |
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| 139 | need_test = 0; |
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| 140 | } |
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| 141 | |
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| 142 | /*-------------------------------------------------------------------- |
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| 143 | * Called once the workerthread gets hold of the session, to do setup |
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| 144 | * setup overhead, we don't want to bother the acceptor thread with. |
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| 145 | */ |
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| 146 | |
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| 147 | void |
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| 148 | VCA_Prep(struct sess *sp) |
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| 149 | { |
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| 150 | char addr[TCP_ADDRBUFSIZE]; |
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| 151 | char port[TCP_PORTBUFSIZE]; |
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| 152 | |
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| 153 | TCP_name(sp->sockaddr, sp->sockaddrlen, |
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| 154 | addr, sizeof addr, port, sizeof port); |
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| 155 | sp->addr = WS_Dup(sp->ws, addr); |
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| 156 | sp->port = WS_Dup(sp->ws, port); |
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| 157 | if (params->log_local_addr) { |
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| 158 | AZ(getsockname(sp->fd, sp->mysockaddr, &sp->mysockaddrlen)); |
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| 159 | TCP_name(sp->mysockaddr, sp->mysockaddrlen, |
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| 160 | addr, sizeof addr, port, sizeof port); |
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| 161 | VSL(SLT_SessionOpen, sp->fd, "%s %s %s %s", |
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| 162 | sp->addr, sp->port, addr, port); |
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| 163 | } else { |
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| 164 | VSL(SLT_SessionOpen, sp->fd, "%s %s %s", |
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| 165 | sp->addr, sp->port, sp->mylsock->name); |
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| 166 | } |
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| 167 | sp->acct.first = sp->t_open; |
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| 168 | if (need_test) |
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| 169 | sock_test(sp->fd); |
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| 170 | if (need_linger) |
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| 171 | AZ(setsockopt(sp->fd, SOL_SOCKET, SO_LINGER, |
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| 172 | &linger, sizeof linger)); |
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| 173 | #ifdef SO_SNDTIMEO_WORKS |
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| 174 | if (need_sndtimeo) |
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| 175 | AZ(setsockopt(sp->fd, SOL_SOCKET, SO_SNDTIMEO, |
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| 176 | &tv_sndtimeo, sizeof tv_sndtimeo)); |
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| 177 | #endif |
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| 178 | #ifdef SO_RCVTIMEO_WORKS |
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| 179 | if (need_rcvtimeo) |
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| 180 | AZ(setsockopt(sp->fd, SOL_SOCKET, SO_RCVTIMEO, |
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| 181 | &tv_rcvtimeo, sizeof tv_rcvtimeo)); |
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| 182 | #endif |
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| 183 | } |
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| 184 | |
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| 185 | /*--------------------------------------------------------------------*/ |
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| 186 | |
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| 187 | static void * |
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| 188 | vca_acct(void *arg) |
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| 189 | { |
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| 190 | struct sess *sp; |
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| 191 | socklen_t l; |
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| 192 | struct sockaddr_storage addr_s; |
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| 193 | struct sockaddr *addr; |
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| 194 | int i; |
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| 195 | struct pollfd *pfd; |
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| 196 | struct listen_sock *ls; |
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| 197 | unsigned u; |
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| 198 | double t0, now, pace; |
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| 199 | |
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| 200 | THR_SetName("cache-acceptor"); |
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| 201 | (void)arg; |
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| 202 | |
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| 203 | /* Set up the poll argument */ |
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| 204 | pfd = calloc(sizeof *pfd, heritage.nsocks); |
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| 205 | AN(pfd); |
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| 206 | i = 0; |
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| 207 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 208 | if (ls->sock < 0) |
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| 209 | continue; |
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| 210 | AZ(listen(ls->sock, params->listen_depth)); |
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| 211 | AZ(setsockopt(ls->sock, SOL_SOCKET, SO_LINGER, |
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| 212 | &linger, sizeof linger)); |
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| 213 | pfd[i].events = POLLIN; |
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| 214 | pfd[i++].fd = ls->sock; |
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| 215 | } |
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| 216 | |
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| 217 | need_test = 1; |
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| 218 | pace = 0; |
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| 219 | t0 = TIM_real(); |
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| 220 | while (1) { |
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| 221 | #ifdef SO_SNDTIMEO_WORKS |
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| 222 | if (params->send_timeout != tv_sndtimeo.tv_sec) { |
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| 223 | need_test = 1; |
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| 224 | tv_sndtimeo.tv_sec = params->send_timeout; |
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| 225 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 226 | if (ls->sock < 0) |
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| 227 | continue; |
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| 228 | AZ(setsockopt(ls->sock, SOL_SOCKET, |
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| 229 | SO_SNDTIMEO, |
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| 230 | &tv_sndtimeo, sizeof tv_sndtimeo)); |
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| 231 | } |
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| 232 | } |
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| 233 | #endif |
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| 234 | #ifdef SO_RCVTIMEO_WORKS |
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| 235 | if (params->sess_timeout != tv_rcvtimeo.tv_sec) { |
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| 236 | need_test = 1; |
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| 237 | tv_rcvtimeo.tv_sec = params->sess_timeout; |
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| 238 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 239 | if (ls->sock < 0) |
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| 240 | continue; |
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| 241 | AZ(setsockopt(ls->sock, SOL_SOCKET, |
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| 242 | SO_RCVTIMEO, |
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| 243 | &tv_rcvtimeo, sizeof tv_rcvtimeo)); |
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| 244 | } |
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| 245 | } |
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| 246 | #endif |
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| 247 | /* Bound the pacing delay by parameter */ |
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| 248 | if (pace > params->acceptor_sleep_max) |
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| 249 | pace = params->acceptor_sleep_max; |
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| 250 | if (pace < params->acceptor_sleep_incr) |
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| 251 | pace = 0.0; |
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| 252 | if (pace > 0.0) |
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| 253 | TIM_sleep(pace); |
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| 254 | i = poll(pfd, heritage.nsocks, 1000); |
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| 255 | now = TIM_real(); |
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| 256 | VSL_stats->uptime = (uint64_t)(now - t0); |
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| 257 | u = 0; |
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| 258 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 259 | if (ls->sock < 0) |
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| 260 | continue; |
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| 261 | if (pfd[u++].revents == 0) |
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| 262 | continue; |
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| 263 | VSL_stats->client_conn++; |
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| 264 | l = sizeof addr_s; |
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| 265 | addr = (void*)&addr_s; |
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| 266 | i = accept(ls->sock, addr, &l); |
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| 267 | if (i < 0) { |
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| 268 | VSL_stats->accept_fail++; |
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| 269 | switch (errno) { |
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| 270 | case EAGAIN: |
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| 271 | case ECONNABORTED: |
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| 272 | break; |
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| 273 | case EMFILE: |
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| 274 | VSL(SLT_Debug, ls->sock, |
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| 275 | "Too many open files " |
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| 276 | "when accept(2)ing. Sleeping."); |
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| 277 | pace += params->acceptor_sleep_incr; |
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| 278 | break; |
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| 279 | default: |
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| 280 | VSL(SLT_Debug, ls->sock, |
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| 281 | "Accept failed: %s", |
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| 282 | strerror(errno)); |
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| 283 | pace += params->acceptor_sleep_incr; |
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| 284 | break; |
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| 285 | } |
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| 286 | continue; |
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| 287 | } |
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| 288 | sp = SES_New(); |
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| 289 | if (sp == NULL) { |
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| 290 | AZ(close(i)); |
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| 291 | VSL_stats->client_drop++; |
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| 292 | pace += params->acceptor_sleep_incr; |
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| 293 | continue; |
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| 294 | } |
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| 295 | sp->fd = i; |
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| 296 | sp->id = i; |
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| 297 | sp->t_open = now; |
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| 298 | sp->t_end = now; |
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| 299 | sp->mylsock = ls; |
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| 300 | assert(l < sp->sockaddrlen); |
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| 301 | memcpy(sp->sockaddr, addr, l); |
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| 302 | sp->sockaddrlen = l; |
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| 303 | |
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| 304 | sp->step = STP_FIRST; |
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| 305 | if (WRK_QueueSession(sp)) { |
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| 306 | VSL_stats->client_drop++; |
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| 307 | pace += params->acceptor_sleep_incr; |
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| 308 | } else { |
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| 309 | pace *= params->acceptor_sleep_decay; |
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| 310 | } |
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| 311 | } |
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| 312 | } |
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| 313 | NEEDLESS_RETURN(NULL); |
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| 314 | } |
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| 315 | |
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| 316 | /*--------------------------------------------------------------------*/ |
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| 317 | |
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| 318 | void |
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| 319 | vca_handover(struct sess *sp, int status) |
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| 320 | { |
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| 321 | |
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| 322 | switch (status) { |
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| 323 | case -2: |
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| 324 | vca_close_session(sp, "blast"); |
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| 325 | SES_Delete(sp); |
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| 326 | break; |
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| 327 | case -1: |
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| 328 | vca_close_session(sp, "no request"); |
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| 329 | SES_Delete(sp); |
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| 330 | break; |
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| 331 | case 1: |
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| 332 | sp->step = STP_START; |
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| 333 | if (WRK_QueueSession(sp)) |
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| 334 | VSL_stats->client_drop_late++; |
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| 335 | break; |
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| 336 | default: |
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| 337 | INCOMPL(); |
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| 338 | } |
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| 339 | } |
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| 340 | |
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| 341 | /*--------------------------------------------------------------------*/ |
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| 342 | |
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| 343 | void |
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| 344 | vca_close_session(struct sess *sp, const char *why) |
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| 345 | { |
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| 346 | int i; |
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| 347 | |
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| 348 | VSL(SLT_SessionClose, sp->id, "%s", why); |
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| 349 | if (sp->fd >= 0) { |
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| 350 | i = close(sp->fd); |
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| 351 | assert(i == 0 || errno != EBADF); /* XXX EINVAL seen */ |
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| 352 | } |
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| 353 | sp->fd = -1; |
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| 354 | } |
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| 355 | |
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| 356 | void |
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| 357 | vca_return_session(struct sess *sp) |
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| 358 | { |
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| 359 | |
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| 360 | CHECK_OBJ_NOTNULL(sp, SESS_MAGIC); |
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| 361 | AZ(sp->obj); |
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| 362 | AZ(sp->vcl); |
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| 363 | assert(sp->fd >= 0); |
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| 364 | /* |
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| 365 | * Set nonblocking in the worker-thread, before passing to the |
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| 366 | * acceptor thread, to reduce syscall density of the latter. |
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| 367 | */ |
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| 368 | TCP_nonblocking(sp->fd); |
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| 369 | if (vca_act->pass == NULL) |
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| 370 | assert(sizeof sp == write(vca_pipes[1], &sp, sizeof sp)); |
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| 371 | else |
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| 372 | vca_act->pass(sp); |
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| 373 | } |
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| 374 | |
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| 375 | /*--------------------------------------------------------------------*/ |
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| 376 | |
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| 377 | static void |
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| 378 | ccf_start(struct cli *cli, const char * const *av, void *priv) |
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| 379 | { |
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| 380 | |
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| 381 | (void)cli; |
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| 382 | (void)av; |
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| 383 | (void)priv; |
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| 384 | |
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| 385 | if (vca_act == NULL) |
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| 386 | vca_act = vca_waiters[0]; |
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| 387 | |
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| 388 | AN(vca_act); |
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| 389 | AN(vca_act->name); |
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| 390 | |
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| 391 | if (vca_act->pass == NULL) |
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| 392 | AZ(pipe(vca_pipes)); |
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| 393 | vca_act->init(); |
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| 394 | AZ(pthread_create(&VCA_thread, NULL, vca_acct, NULL)); |
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| 395 | VSL(SLT_Debug, 0, "Acceptor is %s", vca_act->name); |
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| 396 | } |
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| 397 | |
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| 398 | /*--------------------------------------------------------------------*/ |
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| 399 | |
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| 400 | static void |
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| 401 | ccf_listen_address(struct cli *cli, const char * const *av, void *priv) |
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| 402 | { |
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| 403 | struct listen_sock *ls; |
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| 404 | char h[32], p[32]; |
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| 405 | |
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| 406 | (void)cli; |
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| 407 | (void)av; |
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| 408 | (void)priv; |
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| 409 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 410 | if (ls->sock < 0) |
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| 411 | continue; |
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| 412 | TCP_myname(ls->sock, h, sizeof h, p, sizeof p); |
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| 413 | cli_out(cli, "%s %s\n", h, p); |
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| 414 | } |
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| 415 | } |
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| 416 | |
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| 417 | /*--------------------------------------------------------------------*/ |
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| 418 | |
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| 419 | static struct cli_proto vca_cmds[] = { |
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| 420 | { CLI_SERVER_START, "i", ccf_start }, |
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| 421 | { "debug.listen_address", |
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| 422 | "debug.listen_address", |
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| 423 | "Report the actual listen address\n", 0, 0, |
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| 424 | "d", ccf_listen_address, NULL }, |
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| 425 | { NULL } |
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| 426 | }; |
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| 427 | |
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| 428 | void |
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| 429 | VCA_Init(void) |
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| 430 | { |
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| 431 | |
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| 432 | CLI_AddFuncs(vca_cmds); |
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| 433 | } |
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| 434 | |
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| 435 | void |
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| 436 | VCA_Shutdown(void) |
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| 437 | { |
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| 438 | struct listen_sock *ls; |
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| 439 | int i; |
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| 440 | |
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| 441 | VTAILQ_FOREACH(ls, &heritage.socks, list) { |
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| 442 | if (ls->sock < 0) |
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| 443 | continue; |
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| 444 | i = ls->sock; |
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| 445 | ls->sock = -1; |
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| 446 | (void)close(i); |
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| 447 | } |
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| 448 | } |
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| 449 | |
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| 450 | void |
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| 451 | VCA_tweak_waiter(struct cli *cli, const char *arg) |
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| 452 | { |
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| 453 | int i; |
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| 454 | |
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| 455 | ASSERT_MGT(); |
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| 456 | |
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| 457 | if (arg == NULL) { |
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| 458 | if (vca_act == NULL) |
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| 459 | cli_out(cli, "default"); |
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| 460 | else |
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| 461 | cli_out(cli, "%s", vca_act->name); |
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| 462 | |
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| 463 | cli_out(cli, " ("); |
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| 464 | for (i = 0; vca_waiters[i] != NULL; i++) |
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| 465 | cli_out(cli, "%s%s", i == 0 ? "" : ", ", |
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| 466 | vca_waiters[i]->name); |
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| 467 | cli_out(cli, ")"); |
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| 468 | return; |
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| 469 | } |
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| 470 | if (!strcmp(arg, "default")) { |
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| 471 | vca_act = NULL; |
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| 472 | return; |
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| 473 | } |
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| 474 | for (i = 0; vca_waiters[i]; i++) { |
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| 475 | if (!strcmp(arg, vca_waiters[i]->name)) { |
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| 476 | vca_act = vca_waiters[i]; |
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| 477 | return; |
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| 478 | } |
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| 479 | } |
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| 480 | cli_out(cli, "Unknown waiter"); |
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| 481 | cli_result(cli, CLIS_PARAM); |
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| 482 | } |
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