lnav/src/log_vtab_impl.hh

/**
 * Copyright (c) 2007-2012, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __vtab_impl_hh
#define __vtab_impl_hh

#include <sqlite3.h>

#include <map>
#include <string>
#include <vector>

#include "listview_curses.hh"
#include "logfile_sub_source.hh"

enum {
    VT_COL_LINE_NUMBER,
    VT_COL_LOG_TIME,
    VT_COL_IDLE_MSECS,
    VT_COL_LEVEL,
    VT_COL_MAX
};

class logfile_sub_source;

struct log_cursor {
    vis_line_t lc_curr_line;
    int        lc_sub_index;
};

class log_vtab_impl {
public:
    struct vtab_column {
        vtab_column(const char *name, int type, const char *collator = NULL)
            : vc_name(name), vc_type(type), vc_collator(collator) { };

        const char *vc_name;
        int         vc_type;
        const char *vc_collator;
    };

    log_vtab_impl(const std::string name)
        : vi_name(name) {};
    virtual ~log_vtab_impl() { };

    const std::string &get_name(void) const
    {
        return this->vi_name;
    };

    virtual bool next(log_cursor &lc, logfile_sub_source &lss)
    {
        lc.lc_curr_line = lc.lc_curr_line + vis_line_t(1);
        lc.lc_sub_index = 0;

        if (lc.lc_curr_line == (int)lss.text_line_count()) {
            return true;
        }

        content_line_t    cl(lss.at(lc.lc_curr_line));
        logfile *         lf      = lss.find(cl);
        logfile::iterator lf_iter = lf->begin() + cl;

        if (lf_iter->get_level() & logline::LEVEL_CONTINUED) {
            return false;
        }

        log_format *format = lf->get_format();
        if (format != NULL && format->get_name() == this->vi_name) {
            return true;
        }

        return false;
    };

    virtual void get_columns(std::vector<vtab_column> &cols) { };

    virtual void get_foreign_keys(std::vector<std::string> &keys_inout)
    {
        keys_inout.push_back("log_line");
    };

    virtual void extract(logfile *lf,
                         const std::string &line,
                         std::vector<logline_value> &values)
    {
        log_format *   format = lf->get_format();
        string_attrs_t sa;

        format->annotate(line, sa, values);
    };

    int vi_column_count;
private:
    const std::string vi_name;
};

typedef int (*sql_progress_callback_t)(const log_cursor &lc);

class log_vtab_manager {
public:
    typedef std::map<std::string, log_vtab_impl *>::const_iterator iterator;

    log_vtab_manager(sqlite3 *db,
                     logfile_sub_source &lss,
                     sql_progress_callback_t);

    logfile_sub_source *get_source() { return &this->vm_source; };

    std::string register_vtab(log_vtab_impl *vi);
    std::string unregister_vtab(std::string name);

    log_vtab_impl *lookup_impl(std::string name)
    {
        return this->vm_impls[name];
    };

    iterator begin() const
    {
        return this->vm_impls.begin();
    };

    iterator end() const
    {
        return this->vm_impls.end();
    };

private:
    sqlite3 *           vm_db;
    logfile_sub_source &vm_source;
    std::map<std::string, log_vtab_impl *> vm_impls;
};
#endif