src/lib-storage/mailbox-guid-cache.c

/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "ioloop.h"
#include "hash.h"
#include "mail-storage.h"
#include "mailbox-list-private.h"
#include "mailbox-guid-cache.h"

struct mailbox_guid_cache_rec {
    guid_128_t guid;
    const char *vname;
};

int mailbox_guid_cache_find(struct mailbox_list *list,
                const guid_128_t guid, const char **vname_r)
{
    const struct mailbox_guid_cache_rec *rec;
    const uint8_t *guid_p = guid;

    if (!hash_table_is_created(list->guid_cache) ||
        list->guid_cache_invalidated) {
        mailbox_guid_cache_refresh(list);
        rec = hash_table_lookup(list->guid_cache, guid_p);
    } else {
        rec = hash_table_lookup(list->guid_cache, guid_p);
        if (rec == NULL && list->guid_cache_updated) {
            mailbox_guid_cache_refresh(list);
            rec = hash_table_lookup(list->guid_cache, guid_p);
        }
    }
    if (rec == NULL) {
        *vname_r = NULL;
        return list->guid_cache_errors ? -1 : 0;
    }
    *vname_r = rec->vname;
    return 0;
}

void mailbox_guid_cache_refresh(struct mailbox_list *list)
{
    struct mailbox_list_iterate_context *ctx;
    const struct mailbox_info *info;
    struct mailbox *box;
    struct mailbox_metadata metadata;
    struct mailbox_guid_cache_rec *rec;
    uint8_t *guid_p;

    if (!hash_table_is_created(list->guid_cache)) {
        list->guid_cache_pool =
            pool_alloconly_create("guid cache", 1024*16);
        hash_table_create(&list->guid_cache, list->guid_cache_pool, 0,
                  guid_128_hash, guid_128_cmp);
    } else {
        hash_table_clear(list->guid_cache, TRUE);
        p_clear(list->guid_cache_pool);
    }
    list->guid_cache_invalidated = FALSE;
    list->guid_cache_updated = FALSE;
    list->guid_cache_errors = FALSE;

    ctx = mailbox_list_iter_init(list, "*",
                     MAILBOX_LIST_ITER_SKIP_ALIASES |
                     MAILBOX_LIST_ITER_NO_AUTO_BOXES);
    while ((info = mailbox_list_iter_next(ctx)) != NULL) {
        if ((info->flags &
             (MAILBOX_NOSELECT | MAILBOX_NONEXISTENT)) != 0)
            continue;

        box = mailbox_alloc(list, info->vname, 0);
        if (mailbox_get_metadata(box, MAILBOX_METADATA_GUID,
                     &metadata) < 0) {
            i_error("Couldn't get mailbox %s GUID: %s",
                info->vname, mailbox_get_last_internal_error(box, NULL));
            list->guid_cache_errors = TRUE;
        } else if ((rec = hash_table_lookup(list->guid_cache,
                (const uint8_t *)metadata.guid)) != NULL) {
            i_warning("Mailbox %s has duplicate GUID with %s: %s",
                  info->vname, rec->vname,
                  guid_128_to_string(metadata.guid));
        } else {
            rec = p_new(list->guid_cache_pool,
                    struct mailbox_guid_cache_rec, 1);
            memcpy(rec->guid, metadata.guid, sizeof(rec->guid));
            rec->vname = p_strdup(list->guid_cache_pool, info->vname);
            guid_p = rec->guid;
            hash_table_insert(list->guid_cache, guid_p, rec);
        }
        mailbox_free(&box);
    }
    if (mailbox_list_iter_deinit(&ctx) < 0)
        list->guid_cache_errors = TRUE;
}