Willy Tarreau | 67b5a16 | 2019-08-11 16:38:56 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Event sink management |
| 3 | * |
| 4 | * Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation, version 2.1 |
| 9 | * exclusively. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <sys/uio.h> |
| 22 | #include <common/compat.h> |
| 23 | #include <common/config.h> |
| 24 | #include <common/ist.h> |
| 25 | #include <common/mini-clist.h> |
| 26 | #include <proto/log.h> |
| 27 | #include <proto/sink.h> |
| 28 | |
| 29 | struct list sink_list = LIST_HEAD_INIT(sink_list); |
| 30 | |
| 31 | struct sink *sink_find(const char *name) |
| 32 | { |
| 33 | struct sink *sink; |
| 34 | |
| 35 | list_for_each_entry(sink, &sink_list, sink_list) |
| 36 | if (strcmp(sink->name, name) == 0) |
| 37 | return sink; |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | /* creates a new sink and adds it to the list, it's still generic and not fully |
| 42 | * initialized. Returns NULL on allocation failure. If another one already |
| 43 | * exists with the same name, it will be returned. The caller can detect it as |
| 44 | * a newly created one has type SINK_TYPE_NEW. |
| 45 | */ |
| 46 | static __maybe_unused struct sink *__sink_new(const char *name, const char *desc, enum sink_fmt fmt) |
| 47 | { |
| 48 | struct sink *sink; |
| 49 | |
| 50 | sink = sink_find(name); |
| 51 | if (sink) |
| 52 | goto end; |
| 53 | |
| 54 | sink = malloc(sizeof(*sink)); |
| 55 | if (!sink) |
| 56 | goto end; |
| 57 | |
| 58 | sink->name = name; |
| 59 | sink->desc = desc; |
| 60 | sink->fmt = fmt; |
| 61 | sink->type = SINK_TYPE_NEW; |
| 62 | /* set defaults for syslog ones */ |
| 63 | sink->syslog_facility = 0; |
| 64 | sink->syslog_minlvl = 0; |
| 65 | sink->maxlen = MAX_SYSLOG_LEN; |
| 66 | /* address will be filled by the caller if needed */ |
| 67 | sink->ctx.dropped = 0; |
| 68 | HA_RWLOCK_INIT(&sink->ctx.lock); |
| 69 | LIST_ADDQ(&sink_list, &sink->sink_list); |
| 70 | end: |
| 71 | return sink; |
| 72 | } |
| 73 | |
| 74 | /* tries to send <nmsg> message parts (up to 8, ignored above) from message |
| 75 | * array <msg> to sink <sink>. Formating according to the sink's preference is |
| 76 | * done here. Lost messages are accounted for in the sink's counter. |
| 77 | */ |
| 78 | void sink_write(struct sink *sink, const struct ist msg[], size_t nmsg) |
| 79 | { |
| 80 | struct iovec iovec[10]; |
| 81 | char short_hdr[4]; |
| 82 | size_t maxlen = sink->maxlen ? sink->maxlen : ~0; |
| 83 | size_t sent = 0; |
| 84 | int vec = 0; |
| 85 | |
| 86 | /* keep one char for a possible trailing '\n' in any case */ |
| 87 | maxlen--; |
| 88 | |
| 89 | if (sink->fmt == SINK_FMT_SHORT) { |
| 90 | short_hdr[0] = '<'; |
| 91 | short_hdr[1] = '0' + sink->syslog_minlvl; |
| 92 | short_hdr[2] = '>'; |
| 93 | |
| 94 | iovec[vec].iov_base = short_hdr; |
| 95 | iovec[vec].iov_len = MIN(maxlen, 3); |
| 96 | maxlen -= iovec[vec].iov_len; |
| 97 | vec++; |
| 98 | } |
| 99 | |
| 100 | /* copy the remaining entries from the original message. Skip empty fields and |
| 101 | * truncate the whole message to maxlen. |
| 102 | */ |
| 103 | while (nmsg && vec < (sizeof(iovec) / sizeof(iovec[0]) - 1)) { |
| 104 | iovec[vec].iov_base = msg->ptr; |
| 105 | iovec[vec].iov_len = MIN(maxlen, msg->len); |
| 106 | maxlen -= iovec[vec].iov_len; |
| 107 | if (iovec[vec].iov_len) |
| 108 | vec++; |
| 109 | msg++; nmsg--; |
| 110 | } |
| 111 | |
| 112 | /* now deal with the various sink types here */ |
| 113 | |
| 114 | /* account for errors now */ |
| 115 | if (sent <= 0) |
| 116 | HA_ATOMIC_ADD(&sink->ctx.dropped, 1); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Local variables: |
| 121 | * c-indent-level: 8 |
| 122 | * c-basic-offset: 8 |
| 123 | * End: |
| 124 | */ |