Modpol/storage-local.lua

-- ===================================================================
-- /storage-local.lua
-- Persistent storage in /data using Serpent Serializer
-- Unix systems only

-- ===================================================================
-- Set directories and filenames

modpol.datadir     = modpol.topdir  .. "/data"
modpol.file_ledger = modpol.datadir .. "/ledger.dat"
modpol.file_orgs   = modpol.datadir .. "/orgs.dat"

os.execute ("mkdir -p " .. modpol.datadir)

ocutil.setlogdir  (modpol.datadir)
ocutil.setlogname ("modpol.log")

-- ===================================================================
-- Set up the Serpent Serializer functions.

modpol.serpent = {}
dofile (modpol.topdir .. "/serpent/serpent.lua")

-- ===================================================================
-- This function stores "ledger" data to disk.

local store_ledger = function()
    local ok =  ocutil.file_write (modpol.file_ledger,
modpol.serpent.dump (modpol.ledger))

    if    ok ~= true then
        ocutil.fatal_error ("store_data: ledger")
    end

    local nn  = ocutil.table_length (modpol.ledger)
    local str = "entries"
    if nn == 1 then str = "entry" end
    ocutil.log (nn .. " global ledger entries stored to disk")
end

-- ===================================================================
-- This function stores "orgs" data to disk.

local store_orgs = function()
    local ok =  ocutil.file_write (modpol.file_orgs,
modpol.serpent.dump (modpol.orgs))

    if    ok ~= true then
        ocutil.fatal_error ("store_data: orgs")
    end

    local nn  = ocutil.table_length (modpol.orgs)
    local str = "entries"
    if nn == 1 then str = "entry" end
    ocutil.log (nn .. " orgs stored to disk")
end

-- ===================================================================
-- This function stores data to disk.

modpol.store_data = function()
    store_ledger()
    store_orgs()
end

-- ===================================================================
-- This function loads "ledger" data from disk.

local load_ledger = function()
    local obj =  ocutil.file_read (modpol.file_ledger )
    if    obj ~= nil then
        local func, err = load (obj)
        if err then
            ocutil.fatal_error ("load_data: ledger"   )
        end
        modpol.ledger = func()

        local nn  = ocutil.table_length (modpol.ledger)
        local str = "entries"
        if nn == 1 then str = "entry" end
        ocutil.log (nn .. " global ledger entries loaded from disk")
    else
        ocutil.log ("No stored global ledger data found")
    end
end

-- ===================================================================
-- This function loads "orgs" data from disk.

local load_orgs   = function()
    local obj =  ocutil.file_read (modpol.file_orgs )
    if    obj ~= nil then
        local func, err = load (obj)
        if err then
            ocutil.fatal_error ("load_data: orgs"   )
        end
        modpol.orgs = func()

        local nn  = ocutil.table_length (modpol.orgs)
        local str = "entries"
        if nn == 1 then str = "entry" end
        ocutil.log (nn .. " orgs loaded from disk")
    else
        ocutil.log ("No stored orgs data found")
    end
end

-- ===================================================================
-- This function loads stored data from disk.

modpol.load_storage = function()
    load_ledger()
    load_orgs()
end

-- ===================================================================
-- End of file.