src/imap/imap-sync.c

	imap-sync.c revision 88286b0527bcc0711e312e9db65ca121a45213e3
/* Copyright (C) 2002-2004 Timo Sirainen */

#include "common.h"
#include "str.h"
#include "mail-storage.h"
#include "imap-util.h"
#include "imap-sync.h"
#include "commands.h"

struct cmd_sync_context {
    const char *tagline;
    struct imap_sync_context *sync_ctx;
};

struct imap_sync_context {
    struct client *client;
    struct mailbox *box;

    struct mailbox_transaction_context *t;
    struct mailbox_sync_context *sync_ctx;
    struct mail *mail;

    struct mailbox_sync_rec sync_rec;
    uint32_t seq;

    unsigned int messages_count;

    int failed;
};

struct imap_sync_context *
imap_sync_init(struct client *client, struct mailbox *box,
           enum mailbox_sync_flags flags)
{
    struct imap_sync_context *ctx;
    struct mailbox_status status;

    i_assert(client->mailbox == box);

    ctx = i_new(struct imap_sync_context, 1);
    ctx->client = client;
    ctx->box = box;

    ctx->sync_ctx = mailbox_sync_init(box, flags);
    ctx->t = mailbox_transaction_begin(box, 0);
    ctx->mail = mail_alloc(ctx->t, MAIL_FETCH_FLAGS, 0);
    ctx->messages_count = client->messages_count;

    /* if keyword list changed, send the new list before flag changes */
    if (mailbox_get_status(ctx->box, STATUS_KEYWORDS, &status) == 0) {
        if (client_save_keywords(&client->keywords, status.keywords))
            client_send_mailbox_flags(client, box, status.keywords);
    }

    return ctx;
}

int imap_sync_deinit(struct imap_sync_context *ctx)
{
    struct mailbox_status status;

    mail_free(ctx->mail);

    if (mailbox_sync_deinit(ctx->sync_ctx, &status) < 0 || ctx->failed) {
        mailbox_transaction_rollback(ctx->t);
        i_free(ctx);
        return -1;
    }

    mailbox_transaction_commit(ctx->t, 0);

    t_push();

    ctx->client->messages_count = status.messages;
    if (status.messages != ctx->messages_count) {
        client_send_line(ctx->client,
            t_strdup_printf("* %u EXISTS", status.messages));
    }
    if (status.recent != ctx->client->recent_count) {
                ctx->client->recent_count = status.recent;
        client_send_line(ctx->client,
            t_strdup_printf("* %u RECENT", status.recent));
    }

    t_pop();
    i_free(ctx);
    return 0;
}

int imap_sync_more(struct imap_sync_context *ctx)
{
    enum mail_flags flags;
    const char *const *keywords;
    string_t *str;
    int ret = 1;

    t_push();
    str = t_str_new(256);

    for (;;) {
        if (ctx->seq == 0) {
            /* get next one */
            ret = mailbox_sync_next(ctx->sync_ctx,
                        &ctx->sync_rec);
            if (ret <= 0) {
                if (ret == 0) {
                    /* all finished ok */
                    ret = 1;
                }
                break;
            }
        }

        switch (ctx->sync_rec.type) {
        case MAILBOX_SYNC_TYPE_FLAGS:
        case MAILBOX_SYNC_TYPE_KEYWORDS:
            if (ctx->seq == 0)
                ctx->seq = ctx->sync_rec.seq1;

            ret = 1;
            for (; ctx->seq <= ctx->sync_rec.seq2; ctx->seq++) {
                if (ret <= 0)
                    break;

                if (mail_set_seq(ctx->mail, ctx->seq) < 0) {
                    t_pop();
                    return -1;
                }

                flags = mail_get_flags(ctx->mail);
                keywords = mail_get_keywords(ctx->mail);

                str_truncate(str, 0);
                str_printfa(str, "* %u FETCH (FLAGS (",
                        ctx->seq);
                imap_write_flags(str, flags, keywords);
                str_append(str, "))");

                ret = client_send_line(ctx->client, str_c(str));
            }
            break;
        case MAILBOX_SYNC_TYPE_EXPUNGE:
            if (ctx->seq == 0) {
                ctx->seq = ctx->sync_rec.seq2;
                ctx->messages_count -=
                    ctx->sync_rec.seq2 -
                    ctx->sync_rec.seq1 + 1;
            }
            ret = 1;
            for (; ctx->seq >= ctx->sync_rec.seq1; ctx->seq--) {
                if (ret <= 0)
                    break;

                str_truncate(str, 0);
                str_printfa(str, "* %u EXPUNGE", ctx->seq);
                ret = client_send_line(ctx->client, str_c(str));
            }
            break;
        }
        if (ret <= 0) {
            /* failure / buffer full */
            break;
        }

        ctx->seq = 0;
    }
    t_pop();
    return ret;
}

int imap_sync_nonselected(struct mailbox *box, enum mailbox_sync_flags flags)
{
    struct mailbox_sync_context *ctx;
        struct mailbox_sync_rec sync_rec;
    struct mailbox_status status;

    ctx = mailbox_sync_init(box, flags);
    while (mailbox_sync_next(ctx, &sync_rec) > 0)
        ;
    return mailbox_sync_deinit(ctx, &status);
}

static int cmd_sync_continue(struct client_command_context *cmd)
{
    struct cmd_sync_context *ctx = cmd->context;
    int ret;

    if ((ret = imap_sync_more(ctx->sync_ctx)) == 0)
        return FALSE;

    if (ret < 0)
        ctx->sync_ctx->failed = TRUE;

    if (imap_sync_deinit(ctx->sync_ctx) < 0) {
        client_send_untagged_storage_error(cmd->client,
            mailbox_get_storage(cmd->client->mailbox));
    }

    client_send_tagline(cmd, ctx->tagline);
    return TRUE;
}

int cmd_sync(struct client_command_context *cmd, enum mailbox_sync_flags flags,
         const char *tagline)
{
        struct cmd_sync_context *ctx;

    if (cmd->client->mailbox == NULL) {
        client_send_tagline(cmd, tagline);
        return TRUE;
    }

    if ((client_workarounds & WORKAROUND_DELAY_NEWMAIL) != 0 &&
        (flags & MAILBOX_SYNC_FLAG_FAST) != 0) {
        /* expunges might break just as badly as new mail
           notifications. besides, currently indexing code doesn't
           handle expunges + no-newmail so this is required, unless
           we did this only for no-expunges case.. */
        flags |= MAILBOX_SYNC_FLAG_NO_NEWMAIL |
            MAILBOX_SYNC_FLAG_NO_EXPUNGES;
    }

    ctx = p_new(cmd->pool, struct cmd_sync_context, 1);
    ctx->tagline = p_strdup(cmd->pool, tagline);
    ctx->sync_ctx = imap_sync_init(cmd->client, cmd->client->mailbox,
                       flags);

    cmd->func = cmd_sync_continue;
    cmd->context = ctx;
    cmd->client->command_pending = TRUE;
    return cmd_sync_continue(cmd);
}