src/journal-remote/journal-remote-write.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Zbigniew Jędrzejewski-Szmek
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "journal-remote-write.h"
  23
  24 int iovw_put(struct iovec_wrapper *iovw, void* data, size_t len) {
  25         if (!GREEDY_REALLOC(iovw->iovec, iovw->size_bytes, iovw->count + 1))
  26                 return log_oom();
  27
  28         iovw->iovec[iovw->count++] = (struct iovec) {data, len};
  29         return 0;
  30 }
  31
  32 void iovw_free_contents(struct iovec_wrapper *iovw) {
  33         for (size_t j = 0; j < iovw->count; j++)
  34                 free(iovw->iovec[j].iov_base);
  35         free(iovw->iovec);
  36         iovw->iovec = NULL;
  37         iovw->size_bytes = iovw->count = 0;
  38 }
  39
  40 size_t iovw_size(struct iovec_wrapper *iovw) {
  41         size_t n = 0, i;
  42
  43         for(i = 0; i < iovw->count; i++)
  44                 n += iovw->iovec[i].iov_len;
  45
  46         return n;
  47 }
  48
  49 /**********************************************************************
  50  **********************************************************************
  51  **********************************************************************/
  52
  53 static int do_rotate(JournalFile **f, bool compress, bool seal) {
  54         int r = journal_file_rotate(f, compress, seal);
  55         if (r < 0) {
  56                 if (*f)
  57                         log_error("Failed to rotate %s: %s", (*f)->path,
  58                                   strerror(-r));
  59                 else
  60                         log_error("Failed to create rotated journal: %s",
  61                                   strerror(-r));
  62         }
  63
  64         return r;
  65 }
  66
  67 int writer_init(Writer *s) {
  68         assert(s);
  69
  70         s->journal = NULL;
  71
  72         memset(&s->metrics, 0xFF, sizeof(s->metrics));
  73
  74         s->mmap = mmap_cache_new();
  75         if (!s->mmap)
  76                 return log_oom();
  77
  78         s->seqnum = 0;
  79
  80         return 0;
  81 }
  82
  83 int writer_close(Writer *s) {
  84         if (s->journal)
  85                 journal_file_close(s->journal);
  86         if (s->mmap)
  87                 mmap_cache_unref(s->mmap);
  88         return 0;
  89 }
  90
  91 int writer_write(Writer *s,
  92                  struct iovec_wrapper *iovw,
  93                  dual_timestamp *ts,
  94                  bool compress,
  95                  bool seal) {
  96         int r;
  97
  98         assert(s);
  99         assert(iovw);
 100         assert(iovw->count > 0);
 101
 102         if (journal_file_rotate_suggested(s->journal, 0)) {
 103                 log_info("%s: Journal header limits reached or header out-of-date, rotating",
 104                          s->journal->path);
 105                 r = do_rotate(&s->journal, compress, seal);
 106                 if (r < 0)
 107                         return r;
 108         }
 109
 110         r = journal_file_append_entry(s->journal, ts, iovw->iovec, iovw->count,
 111                                       &s->seqnum, NULL, NULL);
 112         if (r >= 0)
 113                 return 1;
 114
 115         log_info("%s: Write failed, rotating", s->journal->path);
 116         r = do_rotate(&s->journal, compress, seal);
 117         if (r < 0)
 118                 return r;
 119
 120         log_debug("Retrying write.");
 121         r = journal_file_append_entry(s->journal, ts, iovw->iovec, iovw->count,
 122                                       &s->seqnum, NULL, NULL);
 123         return r < 0 ? r : 1;
 124 }