-- load_cfg.lua - internal file

local log = require('log')
local json = require('json')
local private = require('box.internal')
local urilib = require('uri')
local math = require('math')
local fiber = require('fiber')

-- Function decorator that is used to prevent box.cfg() from
-- being called concurrently by different fibers.
local lock = fiber.channel(1)
local function locked(f)
    return function(...)
        lock:put(true)
        local status, err = pcall(f, ...)
        lock:get()
        if not status then
            error(err)
        end
    end
end

--
-- When feedback is disabled, every single mentioning of it should
-- be eliminated. Even box.cfg{} should not accept any
-- 'feedback_*' parameters as valid. This is why they are set to
-- nil, when the daemon does not exist.
--
local function ifdef_feedback(value)
    return private.feedback_daemon ~= nil and value or nil
end

local ifdef_feedback_set_params =
    private.feedback_daemon ~= nil and
    private.feedback_daemon.set_feedback_params or nil

-- all available options
local default_cfg = {
    listen              = nil,
    memtx_memory        = 256 * 1024 *1024,
    strip_core          = true,
    memtx_min_tuple_size = 16,
    memtx_max_tuple_size = 1024 * 1024,
    slab_alloc_granularity = 8,
    slab_alloc_factor   = 1.05,
    iproto_threads      = 1,
    work_dir            = nil,
    memtx_dir           = ".",
    wal_dir             = ".",

    vinyl_dir           = '.',
    vinyl_memory        = 128 * 1024 * 1024,
    vinyl_cache         = 128 * 1024 * 1024,
    vinyl_max_tuple_size = 1024 * 1024,
    vinyl_read_threads  = 1,
    vinyl_write_threads = 4,
    vinyl_timeout       = 60,
    vinyl_run_count_per_level = 2,
    vinyl_run_size_ratio      = 3.5,
    vinyl_range_size          = nil, -- set automatically
    vinyl_page_size           = 8 * 1024,
    vinyl_bloom_fpr           = 0.05,

    -- logging options are covered by
    -- a separate log module; they are
    -- 'log_' prefixed

    io_collect_interval = nil,
    readahead           = 16320,
    snap_io_rate_limit  = nil, -- no limit
    too_long_threshold  = 0.5,
    wal_mode            = "write",
    wal_max_size        = 256 * 1024 * 1024,
    wal_dir_rescan_delay= 2,
    wal_queue_max_size  = 16 * 1024 * 1024,
    wal_cleanup_delay   = 4 * 3600,
    force_recovery      = false,
    replication         = nil,
    instance_uuid       = nil,
    replicaset_uuid     = nil,
    custom_proc_title   = nil,
    pid_file            = nil,
    background          = false,
    username            = nil,
    coredump            = false,
    read_only           = false,
    hot_standby         = false,
    memtx_use_mvcc_engine = false,
    checkpoint_interval = 3600,
    checkpoint_wal_threshold = 1e18,
    checkpoint_count    = 2,
    worker_pool_threads = 4,
    election_mode       = 'off',
    election_timeout    = 5,
    replication_timeout = 1,
    replication_sync_lag = 10,
    replication_sync_timeout = 300,
    replication_synchro_quorum = 1,
    replication_synchro_timeout = 5,
    replication_connect_timeout = 30,
    replication_connect_quorum = nil, -- connect all
    replication_skip_conflict = false,
    replication_anon      = false,
    feedback_enabled      = true,
    feedback_crashinfo    = true,
    feedback_host         = "https://feedback.tarantool.io",
    feedback_interval     = 3600,
    net_msg_max           = 768,
    sql_cache_size        = 5 * 1024 * 1024,
}

-- cfg variables which are covered by modules
local module_cfg = {
    -- logging
    log                 = log.box_api,
    log_nonblock        = log.box_api,
    log_level           = log.box_api,
    log_format          = log.box_api,
}

-- types of available options
-- could be comma separated lua types or 'any' if any type is allowed
local template_cfg = {
    listen              = 'string, number',
    memtx_memory        = 'number',
    strip_core          = 'boolean',
    memtx_min_tuple_size  = 'number',
    memtx_max_tuple_size  = 'number',
    slab_alloc_granularity = 'number',
    slab_alloc_factor   = 'number',
    iproto_threads      = 'number',
    work_dir            = 'string',
    memtx_dir            = 'string',
    wal_dir             = 'string',
    vinyl_dir           = 'string',
    vinyl_memory        = 'number',
    vinyl_cache               = 'number',
    vinyl_max_tuple_size      = 'number',
    vinyl_read_threads        = 'number',
    vinyl_write_threads       = 'number',
    vinyl_timeout             = 'number',
    vinyl_run_count_per_level = 'number',
    vinyl_run_size_ratio      = 'number',
    vinyl_range_size          = 'number',
    vinyl_page_size           = 'number',
    vinyl_bloom_fpr           = 'number',

    log                 = 'module',
    log_nonblock        = 'module',
    log_level           = 'module',
    log_format          = 'module',

    io_collect_interval = 'number',
    readahead           = 'number',
    snap_io_rate_limit  = 'number',
    too_long_threshold  = 'number',
    wal_mode            = 'string',
    wal_max_size        = 'number',
    wal_dir_rescan_delay= 'number',
    wal_cleanup_delay   = 'number',
    force_recovery      = 'boolean',
    replication         = 'string, number, table',
    instance_uuid       = 'string',
    replicaset_uuid     = 'string',
    custom_proc_title   = 'string',
    pid_file            = 'string',
    background          = 'boolean',
    username            = 'string',
    coredump            = 'boolean',
    checkpoint_interval = 'number',
    checkpoint_wal_threshold = 'number',
    wal_queue_max_size  = 'number',
    checkpoint_count    = 'number',
    read_only           = 'boolean',
    hot_standby         = 'boolean',
    memtx_use_mvcc_engine = 'boolean',
    worker_pool_threads = 'number',
    election_mode       = 'string',
    election_timeout    = 'number',
    replication_timeout = 'number',
    replication_sync_lag = 'number',
    replication_sync_timeout = 'number',
    replication_synchro_quorum = 'string, number',
    replication_synchro_timeout = 'number',
    replication_connect_timeout = 'number',
    replication_connect_quorum = 'number',
    replication_skip_conflict = 'boolean',
    replication_anon      = 'boolean',
    feedback_enabled      = ifdef_feedback('boolean'),
    feedback_crashinfo    = ifdef_feedback('boolean'),
    feedback_host         = ifdef_feedback('string'),
    feedback_interval     = ifdef_feedback('number'),
    net_msg_max           = 'number',
    sql_cache_size        = 'number',
}

local function normalize_uri(port)
    if port == nil or type(port) == 'table' then
        return port
    end
    return tostring(port);
end

local function normalize_uri_list(port_list)
    local result = {}
    if type(port_list) == 'table' then
        for _, port in ipairs(port_list) do
            table.insert(result, normalize_uri(port))
        end
    else
        table.insert(result, normalize_uri(port_list))
    end
    return result
end

-- options that require special handling
local modify_cfg = {
    listen             = normalize_uri,
    replication        = normalize_uri_list,
}

local function purge_password_from_uri(uri)
    local parsed = urilib.parse(uri)
    if parsed ~= nil and parsed.password ~= nil then
        return urilib.format(parsed, false)
    end
    return uri
end

local function purge_password_from_uris(uri)
    if uri == nil then
        return nil
    end
    if type(uri) == 'table' then
        local new_table = {}
        for k, v in pairs(uri) do
            new_table[k] = purge_password_from_uri(v)
        end
        return new_table
    end
    return purge_password_from_uri(uri)
end

-- options that require modification for logging
local log_cfg_option = {
    replication = purge_password_from_uris,
}


local function check_instance_uuid()
    if box.cfg.instance_uuid ~= box.info.uuid then
        box.error(box.error.RELOAD_CFG, 'instance_uuid')
    end
end

local function check_replicaset_uuid()
    if box.cfg.replicaset_uuid ~= box.info.cluster.uuid then
        box.error(box.error.RELOAD_CFG, 'replicaset_uuid')
    end
end

-- dynamically settable options
--
-- Note: An option should be in <dynamic_cfg_skip_at_load> table
-- or should be verified in box_check_config(). Otherwise
-- load_cfg() may report an error, but box will be configured in
-- fact.
local dynamic_cfg = {
    listen                  = private.cfg_set_listen,
    replication             = private.cfg_set_replication,
    log_level               = log.box_api.cfg_set_log_level,
    log_format              = log.box_api.cfg_set_log_format,
    io_collect_interval     = private.cfg_set_io_collect_interval,
    readahead               = private.cfg_set_readahead,
    too_long_threshold      = private.cfg_set_too_long_threshold,
    snap_io_rate_limit      = private.cfg_set_snap_io_rate_limit,
    read_only               = private.cfg_set_read_only,
    memtx_memory            = private.cfg_set_memtx_memory,
    memtx_max_tuple_size    = private.cfg_set_memtx_max_tuple_size,
    vinyl_memory            = private.cfg_set_vinyl_memory,
    vinyl_max_tuple_size    = private.cfg_set_vinyl_max_tuple_size,
    vinyl_cache             = private.cfg_set_vinyl_cache,
    vinyl_timeout           = private.cfg_set_vinyl_timeout,
    checkpoint_count        = private.cfg_set_checkpoint_count,
    checkpoint_interval     = private.cfg_set_checkpoint_interval,
    checkpoint_wal_threshold = private.cfg_set_checkpoint_wal_threshold,
    wal_queue_max_size      = private.cfg_set_wal_queue_max_size,
    worker_pool_threads     = private.cfg_set_worker_pool_threads,
    feedback_enabled        = ifdef_feedback_set_params,
    feedback_crashinfo      = ifdef_feedback_set_params,
    feedback_host           = ifdef_feedback_set_params,
    feedback_interval       = ifdef_feedback_set_params,
    -- do nothing, affects new replicas, which query this value on start
    wal_dir_rescan_delay    = function() end,
    wal_cleanup_delay       = private.cfg_set_wal_cleanup_delay,
    custom_proc_title       = function()
        require('title').update(box.cfg.custom_proc_title)
    end,
    force_recovery          = function() end,
    election_mode           = private.cfg_set_election_mode,
    election_timeout        = private.cfg_set_election_timeout,
    replication_timeout     = private.cfg_set_replication_timeout,
    replication_connect_timeout = private.cfg_set_replication_connect_timeout,
    replication_connect_quorum = private.cfg_set_replication_connect_quorum,
    replication_sync_lag    = private.cfg_set_replication_sync_lag,
    replication_sync_timeout = private.cfg_set_replication_sync_timeout,
    replication_synchro_quorum = private.cfg_set_replication_synchro_quorum,
    replication_synchro_timeout = private.cfg_set_replication_synchro_timeout,
    replication_skip_conflict = private.cfg_set_replication_skip_conflict,
    replication_anon        = private.cfg_set_replication_anon,
    instance_uuid           = check_instance_uuid,
    replicaset_uuid         = check_replicaset_uuid,
    net_msg_max             = private.cfg_set_net_msg_max,
    sql_cache_size          = private.cfg_set_sql_cache_size,
}

ifdef_feedback = nil -- luacheck: ignore
ifdef_feedback_set_params = nil -- luacheck: ignore

--
-- For some options it is important in which order they are set.
-- For example, setting 'replication', including self, before
-- 'listen' makes no sense:
--
--     box.cfg{replication = {'localhost:3301'}, listen = 3301}
--
-- Replication won't be able to connect to a not being listened
-- port. In the table below for each option can be set a number.
-- An option is set before all other options having a bigger
-- number. Options without a number are installed after others in
-- an undefined order. The table works for reconfiguration only.
-- Order of first configuration is hardcoded in C and can't be
-- changed.
--
local dynamic_cfg_order = {
    listen                  = 100,
    -- Order of replication_* options does not matter. The only
    -- rule - apply before replication itself.
    replication_timeout     = 150,
    replication_sync_lag    = 150,
    replication_sync_timeout    = 150,
    replication_synchro_quorum  = 150,
    replication_synchro_timeout = 150,
    replication_connect_timeout = 150,
    replication_connect_quorum  = 150,
    replication             = 200,
    -- Anon is set after `replication` as a temporary workaround
    -- for the problem, that `replication` and `replication_anon`
    -- depend on each other. If anon would be configured before
    -- `replication`, it could lead to a bug, when anon is changed
    -- from true to false together with `replication`, and it
    -- would try to deanon the old `replication` before applying
    -- the new one. This should be fixed when box.cfg is able to
    -- apply some parameters together and atomically.
    replication_anon        = 250,
    -- Cleanup delay should be ignored if replication_anon is set.
    wal_cleanup_delay       = 260,
    election_mode           = 300,
    election_timeout        = 320,
}

local function sort_cfg_cb(l, r)
    l = dynamic_cfg_order[l] or math.huge
    r = dynamic_cfg_order[r] or math.huge
    return l < r
end

local dynamic_cfg_skip_at_load = {
    listen                  = true,
    memtx_memory            = true,
    memtx_max_tuple_size    = true,
    vinyl_memory            = true,
    vinyl_max_tuple_size    = true,
    vinyl_cache             = true,
    vinyl_timeout           = true,
    too_long_threshold      = true,
    election_mode           = true,
    election_timeout        = true,
    replication             = true,
    replication_timeout     = true,
    replication_connect_timeout = true,
    replication_connect_quorum = true,
    replication_sync_lag    = true,
    replication_sync_timeout = true,
    replication_synchro_quorum = true,
    replication_synchro_timeout = true,
    replication_skip_conflict = true,
    replication_anon        = true,
    wal_dir_rescan_delay    = true,
    custom_proc_title       = true,
    force_recovery          = true,
    instance_uuid           = true,
    replicaset_uuid         = true,
    net_msg_max             = true,
    readahead               = true,
}

local function convert_gb(size)
    return math.floor(size * 1024 * 1024 * 1024)
end

-- Old to new config translation tables. In case a translation is
-- not 1-to-1, then a function can be used. It takes 2 parameters:
-- value of the old option, value of the new if present. It
-- returns two values - value to replace the old option and to
-- replace the new one.
local translate_cfg = {
    snapshot_count = {'checkpoint_count'},
    snapshot_period = {'checkpoint_interval'},
    slab_alloc_arena = {'memtx_memory', function(old)
        return nil, convert_gb(old)
    end},
    slab_alloc_minimal = {'memtx_min_tuple_size'},
    slab_alloc_maximal = {'memtx_max_tuple_size'},
    snap_dir = {'memtx_dir'},
    logger = {'log'},
    logger_nonblock = {'log_nonblock'},
    panic_on_snap_error = {'force_recovery', function(old)
        return nil, not old end
    },
    panic_on_wal_error = {'force_recovery', function(old)
        return nil, not old end
    },
    replication_source = {'replication'},
    rows_per_wal = {'wal_max_size', function(old, new)
        return old, new
    end},
}

-- Upgrade old config
local function upgrade_cfg(cfg, translate_cfg)
    if cfg == nil then
        return {}
    end
    local result_cfg = {}
    for k, v in pairs(cfg) do
        local translation = translate_cfg[k]
        if translation ~= nil then
            local new_key = translation[1]
            local transform = translation[2]
            log.warn('Deprecated option %s, please use %s instead', k, new_key)
            local new_val_orig = cfg[new_key]
            local old_val, new_val
            if transform == nil then
                new_val = v
            else
                old_val, new_val = transform(v, new_val_orig)
            end
            if new_val_orig ~= nil and
               new_val_orig ~= new_val then
                box.error(box.error.CFG, k,
                          'can not override a value for a deprecated option')
            end
            result_cfg[k] = old_val
            result_cfg[new_key] = new_val
        else
            result_cfg[k] = v
        end
    end
    return result_cfg
end

local function prepare_cfg(cfg, default_cfg, template_cfg,
                           module_cfg, modify_cfg, prefix)
    if cfg == nil then
        return {}
    end
    if type(cfg) ~= 'table' then
        error("Error: cfg should be a table")
    end
    -- just pass {.. dont_check = true, ..} to disable check below
    if cfg.dont_check then
        return
    end
    local readable_prefix = ''
    if prefix ~= nil and prefix ~= '' then
        readable_prefix = prefix .. '.'
    end
    local new_cfg = {}
    local module_cfg_backup = {}
    for k,v in pairs(cfg) do
        local readable_name = readable_prefix .. k;
        if template_cfg[k] == nil then
            box.error(box.error.CFG, readable_name , "unexpected option")
        elseif v == "" or v == nil then
            -- "" and NULL = ffi.cast('void *', 0) set option to default value
            v = default_cfg[k]
        elseif template_cfg[k] == 'any' then -- luacheck: ignore
            -- any type is ok
        elseif type(template_cfg[k]) == 'table' then
            if type(v) ~= 'table' then
                box.error(box.error.CFG, readable_name, "should be a table")
            end
            v = prepare_cfg(v, default_cfg[k], template_cfg[k],
                            module_cfg[k], modify_cfg[k], readable_name)
        elseif template_cfg[k] == 'module' then
            local old_value = module_cfg[k].cfg_get(k, v)
            module_cfg_backup[k] = old_value or box.NULL

            local ok, msg = module_cfg[k].cfg_set(cfg, k, v)
            if not ok then
                -- restore back the old values for modules
                for module_k, module_v in pairs(module_cfg_backup) do
                    module_cfg[module_k].cfg_set(nil, module_k, module_v)
                end
                box.error(box.error.CFG, readable_name, msg)
            end
        elseif (string.find(template_cfg[k], ',') == nil) then
            -- one type
            if type(v) ~= template_cfg[k] then
                box.error(box.error.CFG, readable_name, "should be of type "..
                    template_cfg[k])
            end
        else
            local good_types = string.gsub(template_cfg[k], ' ', '');
            if (string.find(',' .. good_types .. ',', ',' .. type(v) .. ',') == nil) then
                box.error(box.error.CFG, readable_name, "should be one of types "..
                    template_cfg[k])
            end
        end
        if modify_cfg ~= nil and type(modify_cfg[k]) == 'function' then
            v = modify_cfg[k](v)
        end
        new_cfg[k] = v
    end
    return new_cfg
end

local function apply_default_cfg(cfg, default_cfg, module_cfg)
    for k,v in pairs(default_cfg) do
        if cfg[k] == nil then
            cfg[k] = v
        elseif type(v) == 'table' then
            apply_default_cfg(cfg[k], v)
        end
    end
    for k in pairs(module_cfg) do
        if cfg[k] == nil then
            cfg[k] = module_cfg[k].cfg_get(k)
        end
    end
end

-- Return true if two configurations are equivalent.
local function compare_cfg(cfg1, cfg2)
    if type(cfg1) ~= type(cfg2) then
        return false
    end
    if type(cfg1) ~= 'table' then
        return cfg1 == cfg2
    end
    if #cfg1 ~= #cfg2 then
        return false
    end
    for k, v in ipairs(cfg1) do
        if v ~= cfg2[k] then
            return false
        end
    end
    return true
end

local function reload_cfg(oldcfg, cfg)
    cfg = upgrade_cfg(cfg, translate_cfg)
    local newcfg = prepare_cfg(cfg, default_cfg, template_cfg,
                               module_cfg, modify_cfg)
    local ordered_cfg = {}
    -- iterate over original table because prepare_cfg() may store NILs
    for key, val in pairs(cfg) do
        if dynamic_cfg[key] == nil and oldcfg[key] ~= val then
            box.error(box.error.RELOAD_CFG, key);
        end
        table.insert(ordered_cfg, key)
    end
    table.sort(ordered_cfg, sort_cfg_cb)
    for _, key in pairs(ordered_cfg) do
        local val = newcfg[key]
        local oldval = oldcfg[key]
        if not compare_cfg(val, oldval) then
            rawset(oldcfg, key, val)
            if not pcall(dynamic_cfg[key]) then
                rawset(oldcfg, key, oldval) -- revert the old value
                return box.error() -- re-throw
            end
            if log_cfg_option[key] ~= nil then
                val = log_cfg_option[key](val)
            end
            log.info("set '%s' configuration option to %s", key,
                json.encode(val))
        end
    end
    if type(box.on_reload_configuration) == 'function' then
        box.on_reload_configuration()
    end
end

local box_cfg_guard_whitelist = {
    error = true;
    internal = true;
    index = true;
    lib = true;
    session = true;
    tuple = true;
    runtime = true;
    ctl = true,
    NULL = true;
};

-- List of box members that requires full box loading.
local box_restore_after_full_load_list = {
    execute = true,
}

local box = require('box')
-- Move all box members except the whitelisted to box_configured
local box_configured = {}
for k, v in pairs(box) do
    box_configured[k] = v
    if not box_cfg_guard_whitelist[k] then
        box[k] = nil
    end
end

setmetatable(box, {
    __index = function(table, index) -- luacheck: no unused args
        error(debug.traceback("Please call box.cfg{} first"))
        error("Please call box.cfg{} first")
     end
})

-- A trigger on initial box.cfg{} call. Used to perform some checks and
-- send feedback report once instance is fully configured.
local function on_initial_config()
    -- Check if schema version matches Tarantool version and print
    -- warning if it's not (in case user forgot to call
    -- box.schema.upgrade()).
    local needs, schema_version_str = private.schema_needs_upgrade()
    if needs then
        local msg = string.format(
            'Your schema version is %s while Tarantool %s requires a more'..
            ' recent schema version. Please, consider using box.'..
            'schema.upgrade().', schema_version_str, box.info.version)
        log.warn(msg)
    end

    -- Send feedback as soon as instance is configured.
    if private.feedback_daemon ~= nil then
        private.feedback_daemon.send()
    end
end

-- Whether box is loaded.
--
-- `false` when box is not configured or when the initialization
-- is in progress.
--
-- `true` when box is configured.
--
-- Use locked() wrapper to obtain reliable results.
local box_is_configured = false

local function load_cfg(cfg)
    -- A user may save box.cfg (this function) before box loading
    -- and call it afterwards. We should reconfigure box in the
    -- case.
    if box_is_configured then
        reload_cfg(box.cfg, cfg)
        return
    end

    cfg = upgrade_cfg(cfg, translate_cfg)
    cfg = prepare_cfg(cfg, default_cfg, template_cfg,
                      module_cfg, modify_cfg)
    apply_default_cfg(cfg, default_cfg, module_cfg);
    -- Save new box.cfg
    box.cfg = cfg
    if not pcall(private.cfg_check)  then
        box.cfg = locked(load_cfg) -- restore original box.cfg
        return box.error() -- re-throw exception from check_cfg()
    end

    -- NB: After this point the function should not raise an
    -- error.
    --
    -- This is important to have right <box_is_configured> (this
    -- file) and <is_box_configured> (box.cc) values.
    --
    -- It also would be counter-intuitive to receive an error from
    -- box.cfg({<...>}), but find that box is actually configured.

    -- Restore box members after initial configuration.
    for k, v in pairs(box_configured) do
        if not box_restore_after_full_load_list[k] then
            box[k] = v
        end
    end
    setmetatable(box, nil)
    box.cfg = setmetatable(cfg,
        {
            __newindex = function(table, index) -- luacheck: no unused args
                error('Attempt to modify a read-only table')
            end,
            __call = locked(reload_cfg),
        })

    -- This call either succeeds or calls panic() / exit().
    private.cfg_load()

    -- This block does not raise an error: all necessary checks
    -- already performed in private.cfg_check(). See <dynamic_cfg>
    -- comment.
    for key, fun in pairs(dynamic_cfg) do
        local val = cfg[key]
        if val ~= nil then
            if not dynamic_cfg_skip_at_load[key] then
                fun()
            end
            if not compare_cfg(val, default_cfg[key]) then
                if log_cfg_option[key] ~= nil then
                    val = log_cfg_option[key](val)
                end
                log.info("set '%s' configuration option to %s", key, json.encode(val))
            end
        end
    end

    if not box.cfg.read_only and not box.cfg.replication and
       not box.error.injection.get('ERRINJ_AUTO_UPGRADE') then
        box.schema.upgrade{auto = true}
    end

    -- Restore box members that requires full box loading.
    for k, v in pairs(box_configured) do
        if box_restore_after_full_load_list[k] then
            box[k] = v
        end
    end
    box_configured = nil

    box_is_configured = true

    on_initial_config()

end
box.cfg = locked(load_cfg)

--
-- This makes possible do box.execute without calling box.cfg
-- manually. The load_cfg() call overwrites box.execute, see
-- <box_configured> variable.
--
-- box.execute is <box_load_and_execute> when box is not loaded,
-- <lbox_execute> otherwise. <box_load_and_execute> loads box and
-- calls <lbox_execute>.
--
local box_load_and_execute
box_load_and_execute = function(...)
    -- Configure box if it is not configured, no-op otherwise (not
    -- a reconfiguration).
    --
    -- We should check whether box is configured, because a user
    -- may save <box_load_and_execute> function before box loading
    -- and call it afterwards.
    if not box_is_configured then
        locked(function()
            -- Re-check, because after releasing of the lock the
            -- box state may be changed. We should call load_cfg()
            -- only once.
            if not box_is_configured then
                load_cfg()
            end
        end)()
    end

    -- At this point box should be configured and box.execute()
    -- function should be replaced with lbox_execute().
    assert(type(box.cfg) ~= 'function')
    assert(box.execute ~= box_load_and_execute)

    return box.execute(...)
end
box.execute = box_load_and_execute

-- gh-810:
-- hack luajit default cpath
-- commented out because we fixed luajit to build properly, see
-- https://github.com/luajit/luajit/issues/76
-- local format = require('tarantool').build.mod_format
-- package.cpath = package.cpath:gsub(
--     '?.so', '?.' .. format
-- ):gsub('loadall.so', 'loadall.' .. format)
