/* -*- sql -*-

   postgres specific registered procedures for the Bytes File System storage,

   require the plpythonu language installed

*/

CREATE OR REPLACE FUNCTION _fsopen(bytea) RETURNS bytea AS $$

    fpath = args[0]

    if fpath:

        try:

	    data = file(fpath, 'rb').read()

	    #/* XXX due to plpython bug we have to replace some characters... */

            return data.replace("\\", r"\134").replace("\000", r"\000").replace("'", r"\047") #'

        except Exception, ex:

	    plpy.warning('failed to get content for %s: %s', fpath, ex)

     return None

$$ LANGUAGE plpythonu

/* WITH(ISCACHABLE) XXX does postgres handle caching of large data nicely */

;;

/* fspath(eid, entity type, attribute) */

CREATE OR REPLACE FUNCTION fspath(bigint, text, text) RETURNS bytea AS $$

    pkey = 'plan%s%s' % (args[1], args[2])

    try:

        plan = SD[pkey]

    except KeyError:

        #/* then prepare and cache plan to get versioned file information from a

        # version content eid */

        plan = plpy.prepare(

            'SELECT X.cw_%s FROM cw_%s as X WHERE X.cw_eid=$1' % (args[2], args[1]),

            ['bigint'])

        SD[pkey] = plan

    return plpy.execute(plan, [args[0]])[0]

$$ LANGUAGE plpythonu

/* WITH(ISCACHABLE) XXX does postgres handle caching of large data nicely */

;;