src/imap/cmd-search.c

	cmd-search.c revision d85347c2dae4bf38d14fc0ec1ed26c051bcffaa1
/* Copyright (C) 2002 Timo Sirainen */

#include "common.h"
#include "ostream.h"
#include "str.h"
#include "commands.h"
#include "imap-search.h"

#define OUTBUF_SIZE 65536

struct imap_search_context {
        struct mailbox_transaction_context *trans;
        struct mail_search_context *search_ctx;
    struct mail *mail;

    struct timeout *to;
    string_t *output_buf;

    unsigned int output_sent:1;
};

static struct imap_search_context *
imap_search_init(struct client_command_context *cmd, const char *charset,
         struct mail_search_arg *sargs)
{
    struct imap_search_context *ctx;

    ctx = p_new(cmd->pool, struct imap_search_context, 1);
    ctx->trans = mailbox_transaction_begin(cmd->client->mailbox, 0);
    ctx->search_ctx = mailbox_search_init(ctx->trans, charset, sargs, NULL);
    ctx->mail = mail_alloc(ctx->trans, 0, NULL);

    ctx->output_buf = str_new(default_pool, OUTBUF_SIZE);
    str_append(ctx->output_buf, "* SEARCH");
    return ctx;
}

static int imap_search_deinit(struct client_command_context *cmd,
                  struct imap_search_context *ctx)
{
    int ret;

    mail_free(&ctx->mail);
    ret = mailbox_search_deinit(&ctx->search_ctx);

    if (mailbox_transaction_commit(&ctx->trans, 0) < 0)
        ret = -1;

    if (ctx->output_sent || (ret == 0 && !cmd->cancel)) {
        str_append(ctx->output_buf, "\r\n");
        o_stream_send(cmd->client->output,
                  str_data(ctx->output_buf),
                  str_len(ctx->output_buf));
    }
    if (ctx->to != NULL)
        timeout_remove(&ctx->to);
    str_free(&ctx->output_buf);

    cmd->context = NULL;
    return ret;
}

static bool cmd_search_more(struct client_command_context *cmd)
{
    struct imap_search_context *ctx = cmd->context;
    bool tryagain;
    int ret;

    if (cmd->cancel) {
        (void)imap_search_deinit(cmd, ctx);
        return TRUE;
    }

    while ((ret = mailbox_search_next_nonblock(ctx->search_ctx, ctx->mail,
                           &tryagain)) > 0) {
        if (str_len(ctx->output_buf) >= OUTBUF_SIZE - MAX_INT_STRLEN) {
            /* flush. this also causes us to lock the output. */
            cmd->client->output_lock = cmd;
            o_stream_send(cmd->client->output,
                      str_data(ctx->output_buf),
                      str_len(ctx->output_buf));
            str_truncate(ctx->output_buf, 0);
            ctx->output_sent = TRUE;
        }

        str_printfa(ctx->output_buf, " %u",
                cmd->uid ? ctx->mail->uid : ctx->mail->seq);
    }
    if (tryagain)
        return FALSE;

    if (imap_search_deinit(cmd, ctx) < 0)
        ret = -1;

    if (ret < 0) {
        client_send_storage_error(cmd,
            mailbox_get_storage(cmd->client->mailbox));
        return TRUE;
    } else {
        return cmd_sync(cmd, MAILBOX_SYNC_FLAG_FAST |
                (cmd->uid ? 0 : MAILBOX_SYNC_FLAG_NO_EXPUNGES),
                0, "OK Search completed.");
    }
}

static void cmd_search_more_callback(struct client_command_context *cmd)
{
    struct client *client = cmd->client;
    bool finished;

    o_stream_cork(client->output);
    finished = cmd_search_more(cmd);
    o_stream_uncork(client->output);

    if (finished) {
        client_command_free(cmd);
        client_continue_pending_input(client);
    } else {
        if (cmd->output_pending)
            o_stream_set_flush_pending(client->output, TRUE);
    }
}

bool cmd_search(struct client_command_context *cmd)
{
    struct imap_search_context *ctx;
    struct mail_search_arg *sargs;
    const struct imap_arg *args;
    int args_count;
    const char *error, *charset;

    args_count = imap_parser_read_args(cmd->parser, 0, 0, &args);
    if (args_count < 1) {
        if (args_count == -2)
            return FALSE;

        client_send_command_error(cmd, args_count < 0 ? NULL :
                      "Missing SEARCH arguments.");
        return TRUE;
    }
    cmd->client->input_lock = NULL;

    if (!client_verify_open_mailbox(cmd))
        return TRUE;

    if (args->type == IMAP_ARG_ATOM &&
        strcasecmp(IMAP_ARG_STR_NONULL(args), "CHARSET") == 0) {
        /* CHARSET specified */
        args++;
        if (args->type != IMAP_ARG_ATOM &&
            args->type != IMAP_ARG_STRING) {
            client_send_command_error(cmd,
                          "Invalid charset argument.");
            return TRUE;
        }

        charset = IMAP_ARG_STR(args);
        args++;
    } else {
        charset = "UTF-8";
    }

    sargs = imap_search_args_build(cmd->pool, cmd->client->mailbox,
                       args, &error);
    if (sargs == NULL) {
        /* error in search arguments */
        client_send_tagline(cmd, t_strconcat("BAD ", error, NULL));
        return TRUE;
    }

    ctx = imap_search_init(cmd, charset, sargs);
    cmd->func = cmd_search_more;
    cmd->context = ctx;

    if (cmd_search_more(cmd))
        return TRUE;

    /* we could have moved onto syncing by now */
    if (cmd->func == cmd_search_more)
        ctx->to = timeout_add(0, cmd_search_more_callback, cmd);
    return FALSE;
}