path: root/camel/camel-disco-diary.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-disco-diary.c: class for a disconnected operation log */

/* 
 * Authors: Dan Winship <danw@ximian.com>
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "camel-disco-diary.h"
#include "camel-disco-folder.h"
#include "camel-disco-store.h"
#include "camel-exception.h"
#include "camel-file-utils.h"
#include "camel-folder.h"
#include "camel-operation.h"
#include "camel-session.h"
#include "camel-store.h"

#include <errno.h>


static void
camel_disco_diary_class_init (CamelDiscoDiaryClass *camel_disco_diary_class)
{
    /* virtual method definition */
}

static void
camel_disco_diary_init (CamelDiscoDiary *diary)
{
    diary->folders = g_hash_table_new (g_str_hash, g_str_equal);
    diary->uidmap = g_hash_table_new (g_str_hash, g_str_equal);
}

static void
unref_folder (gpointer key, gpointer value, gpointer data)
{
    camel_object_unref (value);
}

static void
free_uid (gpointer key, gpointer value, gpointer data)
{
    g_free (key);
    g_free (value);
}

static void
camel_disco_diary_finalize (CamelDiscoDiary *diary)
{
    if (diary->file)
        fclose (diary->file);
    if (diary->folders) {
        g_hash_table_foreach (diary->folders, unref_folder, NULL);
        g_hash_table_destroy (diary->folders);
    }
    if (diary->uidmap) {
        g_hash_table_foreach (diary->uidmap, free_uid, NULL);
        g_hash_table_destroy (diary->uidmap);
    }
}

CamelType
camel_disco_diary_get_type (void)
{
    static CamelType camel_disco_diary_type = CAMEL_INVALID_TYPE;

    if (camel_disco_diary_type == CAMEL_INVALID_TYPE) {
        camel_disco_diary_type = camel_type_register (
            CAMEL_OBJECT_TYPE, "CamelDiscoDiary",
            sizeof (CamelDiscoDiary),
            sizeof (CamelDiscoDiaryClass),
            (CamelObjectClassInitFunc) camel_disco_diary_class_init,
            NULL,
            (CamelObjectInitFunc) camel_disco_diary_init,
            (CamelObjectFinalizeFunc) camel_disco_diary_finalize);
    }

    return camel_disco_diary_type;
}


static int
diary_encode_uids (CamelDiscoDiary *diary, GPtrArray *uids)
{
    int i, status;

    status = camel_file_util_encode_uint32 (diary->file, uids->len);
    for (i = 0; status != -1 && i < uids->len; i++)
        status = camel_file_util_encode_string (diary->file, uids->pdata[i]);
    return status;
}

void
camel_disco_diary_log (CamelDiscoDiary *diary, CamelDiscoDiaryAction action,
               ...)
{
    va_list ap;
    int status;

    /* You may already be a loser. */
    if (!diary->file)
        return;

    status = camel_file_util_encode_uint32 (diary->file, action);
    if (status == -1)
        goto lose;

    va_start (ap, action);
    switch (action) {
    case CAMEL_DISCO_DIARY_FOLDER_EXPUNGE:
    {
        CamelFolder *folder = va_arg (ap, CamelFolder *);
        GPtrArray *uids = va_arg (ap, GPtrArray *);

        status = camel_file_util_encode_string (diary->file, folder->full_name);
        if (status != -1)
            status = diary_encode_uids (diary, uids);
        break;
    }

    case CAMEL_DISCO_DIARY_FOLDER_APPEND:
    {
        CamelFolder *folder = va_arg (ap, CamelFolder *);
        char *uid = va_arg (ap, char *);

        status = camel_file_util_encode_string (diary->file, folder->full_name);
        if (status != -1)
            status = camel_file_util_encode_string (diary->file, uid);
        break;
    }

    case CAMEL_DISCO_DIARY_FOLDER_MOVE:
    case CAMEL_DISCO_DIARY_FOLDER_COPY:
    {
        CamelFolder *source = va_arg (ap, CamelFolder *);
        CamelFolder *destination = va_arg (ap, CamelFolder *);
        GPtrArray *uids = va_arg (ap, GPtrArray *);

        status = camel_file_util_encode_string (diary->file, source->full_name);
        if (status == -1)
            break;
        status = camel_file_util_encode_string (diary->file, destination->full_name);
        if (status == -1)
            break;
        status = diary_encode_uids (diary, uids);
        break;
    }

    default:
        g_assert_not_reached ();
        break;
    }

    va_end (ap);

 lose:
    if (status == -1) {
        char *msg;

        msg = g_strdup_printf (_("Could not write log entry: %s\n"
                     "Further operations on this server "
                     "will not be replayed when you\n"
                     "reconnect to the network."),
                       g_strerror (errno));
        camel_session_alert_user (camel_service_get_session (CAMEL_SERVICE (diary->store)),
                      CAMEL_SESSION_ALERT_ERROR,
                      msg, FALSE);
        g_free (msg);

        fclose (diary->file);
        diary->file = NULL;
    }
}

static void
free_uids (GPtrArray *array)
{
    while (array->len--)
        g_free (array->pdata[array->len]);
    g_ptr_array_free (array, TRUE);
}

static GPtrArray *
diary_decode_uids (CamelDiscoDiary *diary)
{
    GPtrArray *uids;
    char *uid;
    guint32 i;

    if (camel_file_util_decode_uint32 (diary->file, &i) == -1)
        return NULL;
    uids = g_ptr_array_new ();
    while (i--) {
        if (camel_file_util_decode_string (diary->file, &uid) == -1) {
            free_uids (uids);
            return NULL;
        }
        g_ptr_array_add (uids, uid);
    }

    return uids;
}

static CamelFolder *
diary_decode_folder (CamelDiscoDiary *diary)
{
    CamelFolder *folder;
    char *name;

    if (camel_file_util_decode_string (diary->file, &name) == -1)
        return NULL;
    folder = g_hash_table_lookup (diary->folders, name);
    if (!folder) {
        CamelException ex;
        char *msg;

        camel_exception_init (&ex);
        folder = camel_store_get_folder (CAMEL_STORE (diary->store),
                         name, 0, &ex);
        if (folder)
            g_hash_table_insert (diary->folders, name, folder);
        else {
            msg = g_strdup_printf (_("Could not open `%s':\n%s\nChanges made to this folder will not be resynchronized."),
                           name, camel_exception_get_description (&ex));
            camel_exception_clear (&ex);
            camel_session_alert_user (camel_service_get_session (CAMEL_SERVICE (diary->store)),
                          CAMEL_SESSION_ALERT_WARNING,
                          msg, FALSE);
            g_free (msg);
            g_free (name);
        }
    } else
        g_free (name);
    return folder;
}

static void
close_folder (gpointer name, gpointer folder, gpointer data)
{
    g_free (name);
    camel_folder_sync (folder, FALSE, NULL);
    camel_object_unref (folder);
}

void
camel_disco_diary_replay (CamelDiscoDiary *diary, CamelException *ex)
{
    guint32 action;
    off_t size;
    double pc;

    fseek (diary->file, 0, SEEK_END);
    size = ftell (diary->file);
    g_return_if_fail (size != 0);
    rewind (diary->file);

    camel_operation_start (NULL, _("Resynchronizing with server"));
    while (!camel_exception_is_set (ex)) {
        pc = ftell (diary->file) / size;
        camel_operation_progress (NULL, pc * 100);

        if (camel_file_util_decode_uint32 (diary->file, &action) == -1)
            break;
        if (action == CAMEL_DISCO_DIARY_END)
            break;

        switch (action) {
        case CAMEL_DISCO_DIARY_FOLDER_EXPUNGE:
        {
            CamelFolder *folder;
            GPtrArray *uids;

            folder = diary_decode_folder (diary);
            uids = diary_decode_uids (diary);
            if (!uids)
                goto lose;

            if (folder)
                camel_disco_folder_expunge_uids (folder, uids, ex);
            free_uids (uids);
            break;
        }

        case CAMEL_DISCO_DIARY_FOLDER_APPEND:
        {
            CamelFolder *folder;
            char *uid;
            CamelMimeMessage *message;
            CamelMessageInfo *info;

            folder = diary_decode_folder (diary);
            if (camel_file_util_decode_string (diary->file, &uid) == -1)
                goto lose;

            if (!folder) {
                g_free (uid);
                continue;
            }

            message = camel_folder_get_message (folder, uid, NULL);
            if (!message) {
                /* The message was appended and then deleted. */
                g_free (uid);
                continue;
            }
            info = camel_folder_get_message_info (folder, uid);

            camel_folder_append_message (folder, message, info, ex);
            g_free (uid);
            camel_folder_free_message_info (folder, info);

            break;
        }

        case CAMEL_DISCO_DIARY_FOLDER_COPY:
        case CAMEL_DISCO_DIARY_FOLDER_MOVE:
        {
            CamelFolder *source, *destination;
            GPtrArray *uids;

            source = diary_decode_folder (diary);
            destination = diary_decode_folder (diary);
            uids = diary_decode_uids (diary);
            if (!uids)
                goto lose;

            if (!source || !destination) {
                free_uids (uids);
                continue;
            }

            if (action == CAMEL_DISCO_DIARY_FOLDER_COPY)
                camel_folder_copy_messages_to (source, uids, destination, ex);
            else
                camel_folder_move_messages_to (source, uids, destination, ex);
            free_uids (uids);
            break;
        }

        }
    }

 lose:
    camel_operation_end (NULL);

    /* Close folders */
    g_hash_table_foreach (diary->folders, close_folder, diary);
    g_hash_table_destroy (diary->folders);
    diary->folders = NULL;

    /* Truncate the log */
    ftruncate (fileno (diary->file), 0);
}

CamelDiscoDiary *
camel_disco_diary_new (CamelDiscoStore *store, const char *filename, CamelException *ex)
{
    CamelDiscoDiary *diary;

    g_return_val_if_fail (CAMEL_IS_DISCO_STORE (store), NULL);
    g_return_val_if_fail (filename != NULL, NULL);

    diary = CAMEL_DISCO_DIARY (camel_object_new (CAMEL_DISCO_DIARY_TYPE));
    diary->store = store;

    diary->file = fopen (filename, "a+");
    if (!diary->file) {
        camel_object_unref (CAMEL_OBJECT (diary));
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      "Could not open journal file: %s",
                      g_strerror (errno));
        return NULL;
    }

    return diary;
}

gboolean
camel_disco_diary_empty  (CamelDiscoDiary *diary)
{
    return ftell (diary->file) == 0;
}

void
camel_disco_diary_uidmap_add (CamelDiscoDiary *diary, const char *old_uid,
                  const char *new_uid)
{
    g_hash_table_insert (diary->uidmap, g_strdup (old_uid),
                 g_strdup (new_uid));
}

const char *
camel_disco_diary_uidmap_lookup (CamelDiscoDiary *diary, const char *uid)
{
    return g_hash_table_lookup (diary->uidmap, uid);
}