// =-=-=-=-=-=-=-
// redirect_get - code to determine redirection for get operation
irods::error univ_mss_file_redirect_open(
irods::plugin_property_map& _prop_map,
irods::file_object_ptr _file_obj,
const std::string& _resc_name,
const std::string& _curr_host,
float& _out_vote ) {
// =-=-=-=-=-=-=-
// determine if the resource is down
int resc_status = 0;
irods::error get_ret = _prop_map.get< int >( irods::RESOURCE_STATUS, resc_status );
if ( !get_ret.ok() ) {
return PASSMSG( "univ_mss_file_redirect_open - failed to get 'status' property", get_ret );
}
// =-=-=-=-=-=-=-
// if the status is down, vote no.
if ( INT_RESC_STATUS_DOWN == resc_status ) {
_out_vote = 0.0;
return SUCCESS();
}
// =-=-=-=-=-=-=-
// get the resource host for comparison to curr host
std::string host_name;
get_ret = _prop_map.get< std::string >( irods::RESOURCE_LOCATION, host_name );
if ( !get_ret.ok() ) {
return PASSMSG( "univ_mss_file_redirect_open - failed to get 'location' property", get_ret );
}
// =-=-=-=-=-=-=-
// set a flag to test if were at the curr host, if so we vote higher
bool curr_host = ( _curr_host == host_name );
// =-=-=-=-=-=-=-
// make some flags to clairify decision making
bool need_repl = ( _file_obj->repl_requested() > -1 );
// =-=-=-=-=-=-=-
// set up variables for iteration
irods::error final_ret = SUCCESS();
std::vector< irods::physical_object > objs = _file_obj->replicas();
std::vector< irods::physical_object >::iterator itr = objs.begin();
// =-=-=-=-=-=-=-
// initially set vote to 0.0
_out_vote = 0.0;
// =-=-=-=-=-=-=-
// check to see if the replica is in this resource, if one is requested
for ( ; itr != objs.end(); ++itr ) {
// =-=-=-=-=-=-=-
// run the hier string through the parser and get the last
// entry.
std::string last_resc;
irods::hierarchy_parser parser;
parser.set_string( itr->resc_hier() );
parser.last_resc( last_resc );
// =-=-=-=-=-=-=-
// more flags to simplify decision making
bool repl_us = ( _file_obj->repl_requested() == itr->repl_num() );
bool resc_us = ( _resc_name == last_resc );
// =-=-=-=-=-=-=-
// success - correct resource and dont need a specific
// replication, or the repl nums match
if ( resc_us ) {
if ( !need_repl || ( need_repl && repl_us ) ) {
if ( curr_host ) {
_out_vote = 1.0;
}
else {
_out_vote = 0.5;
}
break;
}
} // if resc_us
} // for itr
return SUCCESS();
} // redirect_get
// =-=-=-=-=-=-=-
// redirect_open - code to determine redirection for open operation
irods::error impostor_resource_redirect_open(
irods::plugin_property_map& _prop_map,
irods::file_object_ptr _file_obj,
const std::string& _resc_name,
const std::string& _curr_host,
float& _out_vote ) {
irods::error result = SUCCESS();
// =-=-=-=-=-=-=-
// initially set a good default
_out_vote = 0.0;
// =-=-=-=-=-=-=-
// determine if the resource is down
int resc_status = 0;
irods::error get_ret = _prop_map.get< int >( irods::RESOURCE_STATUS, resc_status );
if ( ( result = ASSERT_PASS( get_ret, "Failed to get \"status\" property." ) ).ok() ) {
// =-=-=-=-=-=-=-
// if the status is down, vote no.
if ( INT_RESC_STATUS_DOWN != resc_status ) {
// =-=-=-=-=-=-=-
// get the resource host for comparison to curr host
std::string host_name;
get_ret = _prop_map.get< std::string >( irods::RESOURCE_LOCATION, host_name );
if ( ( result = ASSERT_PASS( get_ret, "Failed to get \"location\" property." ) ).ok() ) {
// =-=-=-=-=-=-=-
// set a flag to test if were at the curr host, if so we vote higher
bool curr_host = ( _curr_host == host_name );
// =-=-=-=-=-=-=-
// make some flags to clarify decision making
bool need_repl = ( _file_obj->repl_requested() > -1 );
// =-=-=-=-=-=-=-
// set up variables for iteration
irods::error final_ret = SUCCESS();
std::vector< irods::physical_object > objs = _file_obj->replicas();
std::vector< irods::physical_object >::iterator itr = objs.begin();
// =-=-=-=-=-=-=-
// check to see if the replica is in this resource, if one is requested
for ( ; itr != objs.end(); ++itr ) {
// =-=-=-=-=-=-=-
// run the hier string through the parser and get the last
// entry.
std::string last_resc;
irods::hierarchy_parser parser;
parser.set_string( itr->resc_hier() );
parser.last_resc( last_resc );
// =-=-=-=-=-=-=-
// more flags to simplify decision making
bool repl_us = ( _file_obj->repl_requested() == itr->repl_num() );
bool resc_us = ( _resc_name == last_resc );
bool is_dirty = ( itr->is_dirty() != 1 );
// =-=-=-=-=-=-=-
// success - correct resource and don't need a specific
// replication, or the repl nums match
if ( resc_us ) {
// =-=-=-=-=-=-=-
// if a specific replica is requested then we
// ignore all other criteria
if ( need_repl ) {
if ( repl_us ) {
_out_vote = 1.0;
}
else {
// =-=-=-=-=-=-=-
// repl requested and we are not it, vote
// very low
_out_vote = 0.25;
}
}
else {
// =-=-=-=-=-=-=-
// if no repl is requested consider dirty flag
if ( is_dirty ) {
// =-=-=-=-=-=-=-
// repl is dirty, vote very low
_out_vote = 0.25;
}
else {
// =-=-=-=-=-=-=-
// if our repl is not dirty then a local copy
// wins, otherwise vote middle of the road
if ( curr_host ) {
_out_vote = 1.0;
}
else {
_out_vote = 0.5;
}
}
}
rodsLog(
LOG_DEBUG,
"open :: resc name [%s] curr host [%s] resc host [%s] vote [%f]",
_resc_name.c_str(),
_curr_host.c_str(),
host_name.c_str(),
_out_vote );
break;
} // if resc_us
} // for itr
}
}
else {
result.code( SYS_RESC_IS_DOWN );
result = PASS( result );
}
}
return result;
} // impostor_resource_redirect_open