src/imap/cmd-copy.c

	cmd-copy.c revision 62f49ddfc6fddae2c512961e17d8c7b963108bb4
/* Copyright (c) 2002-2010 Dovecot authors, see the included COPYING file */

#include "imap-common.h"
#include "str.h"
#include "ostream.h"
#include "imap-resp-code.h"
#include "imap-util.h"
#include "imap-commands.h"
#include "imap-search-args.h"

#include <time.h>

#define COPY_CHECK_INTERVAL 100

static void client_send_sendalive_if_needed(struct client *client)
{
    time_t now, last_io;

    if (o_stream_get_buffer_used_size(client->output) != 0)
        return;

    now = time(NULL);
    last_io = I_MAX(client->last_input, client->last_output);
    if (now - last_io > MAIL_STORAGE_STAYALIVE_SECS) {
        o_stream_send_str(client->output, "* OK Hang in there..\r\n");
        o_stream_flush(client->output);
        client->last_output = now;
    }
}

static int fetch_and_copy(struct client *client,
              struct mailbox_transaction_context *t,
              struct mail_search_args *search_args,
              const char **src_uidset_r,
              unsigned int *copy_count_r)
{
    struct mail_search_context *search_ctx;
        struct mailbox_transaction_context *src_trans;
    struct mail_save_context *save_ctx;
    struct mail *mail;
    unsigned int copy_count = 0;
    struct msgset_generator_context srcset_ctx;
    string_t *src_uidset;
    int ret;

    src_uidset = t_str_new(256);
    msgset_generator_init(&srcset_ctx, src_uidset);

    src_trans = mailbox_transaction_begin(client->mailbox, 0);
    search_ctx = mailbox_search_init(src_trans, search_args, NULL);

    mail = mail_alloc(src_trans, 0, NULL);
    ret = 1;
    while (mailbox_search_next(search_ctx, mail) && ret > 0) {
        if (mail->expunged) {
            ret = 0;
            break;
        }

        if ((++copy_count % COPY_CHECK_INTERVAL) == 0)
            client_send_sendalive_if_needed(client);

        save_ctx = mailbox_save_alloc(t);
        mailbox_save_copy_flags(save_ctx, mail);

        if (mailbox_copy(&save_ctx, mail) < 0)
            ret = mail->expunged ? 0 : -1;

        msgset_generator_next(&srcset_ctx, mail->uid);
    }
    mail_free(&mail);
    msgset_generator_finish(&srcset_ctx);

    if (mailbox_search_deinit(&search_ctx) < 0)
        ret = -1;

    if (mailbox_transaction_commit(&src_trans) < 0)
        ret = -1;

    *src_uidset_r = str_c(src_uidset);
    *copy_count_r = copy_count;
    return ret;
}

bool cmd_copy(struct client_command_context *cmd)
{
    struct client *client = cmd->client;
    struct mail_storage *dest_storage;
    struct mailbox *destbox;
    struct mailbox_transaction_context *t;
        struct mail_search_args *search_args;
    const char *messageset, *mailbox, *src_uidset;
    enum mailbox_sync_flags sync_flags = 0;
    enum imap_sync_flags imap_flags = 0;
    struct mail_transaction_commit_changes changes;
    unsigned int copy_count;
    string_t *msg;
    int ret;

    /* <message set> <mailbox> */
    if (!client_read_string_args(cmd, 2, &messageset, &mailbox))
        return FALSE;

    if (!client_verify_open_mailbox(cmd))
        return TRUE;

    ret = imap_search_get_seqset(cmd, messageset, cmd->uid, &search_args);
    if (ret <= 0)
        return ret < 0;

    if (client_open_save_dest_box(cmd, mailbox, &destbox) < 0)
        return TRUE;

    t = mailbox_transaction_begin(destbox,
                      MAILBOX_TRANSACTION_FLAG_EXTERNAL |
                      MAILBOX_TRANSACTION_FLAG_ASSIGN_UIDS);
    ret = fetch_and_copy(client, t, search_args, &src_uidset, &copy_count);
    mail_search_args_unref(&search_args);

    msg = t_str_new(256);
    if (ret <= 0)
        mailbox_transaction_rollback(&t);
    else if (mailbox_transaction_commit_get_changes(&t, &changes) < 0)
        ret = -1;
    else if (copy_count == 0) {
        str_append(msg, "OK No messages copied.");
        pool_unref(&changes.pool);
    } else if (seq_range_count(&changes.saved_uids) == 0) {
        /* not supported by backend (virtual) */
        str_append(msg, "OK Copy completed.");
        pool_unref(&changes.pool);
    } else {
        i_assert(copy_count == seq_range_count(&changes.saved_uids));

        str_printfa(msg, "OK [COPYUID %u %s ", changes.uid_validity,
                src_uidset);
        imap_write_seq_range(msg, &changes.saved_uids);
        str_append(msg, "] Copy completed.");
        pool_unref(&changes.pool);
    }

    dest_storage = mailbox_get_storage(destbox);
    if (destbox != client->mailbox) {
        sync_flags |= MAILBOX_SYNC_FLAG_FAST;
        imap_flags |= IMAP_SYNC_FLAG_SAFE;
        mailbox_free(&destbox);
    }

    if (ret > 0)
        return cmd_sync(cmd, sync_flags, imap_flags, str_c(msg));
    else if (ret == 0) {
        /* some messages were expunged, sync them */
        return cmd_sync(cmd, 0, 0,
            "NO ["IMAP_RESP_CODE_EXPUNGEISSUED"] "
            "Some of the requested messages no longer exist.");
    } else {
        client_send_storage_error(cmd, dest_storage);
        return TRUE;
    }
}