/// =-=-=-=-=-=-=-
/// @brief get the next resource shared pointer given this resources name
/// as well as the file object
irods::error get_next_child_for_open_or_write(
const std::string& _name,
irods::file_object_ptr& _file_obj,
irods::resource_child_map& _cmap,
irods::resource_ptr& _resc ) {
// =-=-=-=-=-=-=-
// set up iteration over physical objects
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
irods::hierarchy_parser parser;
parser.set_string( itr->resc_hier() );
// =-=-=-=-=-=-=-
// find this resource in the hier
if ( !parser.resc_in_hier( _name ) ) {
continue;
}
// =-=-=-=-=-=-=-
// if we have a hit, get the resc ptr to the next resc
return get_next_child_in_hier(
_name,
itr->resc_hier(),
_cmap,
_resc );
} // for itr
std::string msg( "no replica found in resc [" );
msg += _name + "]";
return ERROR(
REPLICA_NOT_IN_RESC,
msg );
} // get_next_child_for_open_or_write
/// =-=-=-=-=-=-=-
/// @brief function to handle resolving the hier given votes of the
/// root resources for an open operation
static
error resolve_hier_for_open_or_write_without_keyword(
rsComm_t* _comm,
irods::file_object_ptr _file_obj,
const std::string& _oper,
std::string& _out_hier ) {
// =-=-=-=-=-=-=-
// build a list of root hiers for all
// the repls we have in the list
std::map< std::string, float > root_map;
// =-=-=-=-=-=-=-
// grid throught the list, get the root of the hiers and
// place it into the map
std::vector< physical_object > repls = _file_obj->replicas();
for ( size_t i = 0; i < repls.size(); ++i ) {
// =-=-=-=-=-=-=-
// extract the root resource from the hierarchy
hierarchy_parser parser;
parser.set_string( repls[ i ].resc_hier() );
std::string root_resc;
parser.first_resc( root_resc );
root_map[ root_resc ] = 0.0;
} // for i
// =-=-=-=-=-=-=-
// grind through the map and get a vote for each root
// cache that and keep track of the max
std::string max_hier;
float max_vote = -1.0;
std::map< std::string, float >::iterator itr = root_map.begin();
for ( ; itr != root_map.end(); ++itr ) {
// =-=-=-=-=-=-=-
// request the vote
float vote = 0.0;
std::string voted_hier;
irods::error ret = request_vote_for_file_object(
_comm,
_oper.c_str(),
itr->first,
_file_obj,
voted_hier,
vote );
if ( ret.ok() ) {
// =-=-=-=-=-=-=-
// assign the vote to the root
itr->second = vote;
// =-=-=-=-=-=-=-
// keep track of max vote, hier and resc name
if ( vote > max_vote ) {
max_vote = vote;
max_hier = voted_hier;
}
}
} // for itr
// =-=-=-=-=-=-=-
// if we have a max vote of 0.0 then
// this is an error
double diff = ( max_vote - 0.00000001 );
if ( diff <= 0.0 ) {
return ERROR(
HIERARCHY_ERROR,
"no valid resource found for data object" );
}
// =-=-=-=-=-=-=-
// set out variables
_out_hier = max_hier;
return SUCCESS();
} // resolve_hier_for_open_or_write_without_keyword
/// =-=-=-=-=-=-=-
/// @brief function to handle resolving the hier given the fco and
/// resource keyword for create or open depending on the keyword
static
error resolve_hier_for_create_or_open(
rsComm_t* _comm,
irods::file_object_ptr _file_obj,
const char* _key_word,
dataObjInp_t* _data_obj_inp,
std::string& _out_hier ) {
// =-=-=-=-=-=-=-
// regardless we need to resolve the appropriate resource
// to do the voting so search the repls for the proper resc
std::vector< physical_object > repls = _file_obj->replicas();
bool kw_match_found = false;
if ( _key_word ) {
// =-=-=-=-=-=-=-
// we have a kw present, compare against all the repls for a match
for ( size_t i = 0; i < repls.size(); ++i ) {
// =-=-=-=-=-=-=-
// extract the root resource from the hierarchy
std::string root_resc;
hierarchy_parser parser;
parser.set_string( repls[ i ].resc_hier() );
parser.first_resc( root_resc );
// =-=-=-=-=-=-=-
// if we have a match then set open & break, otherwise continue
if ( root_resc == _key_word ) {
_file_obj->resc_hier( repls[ i ].resc_hier() );
kw_match_found = true;
break;
}
} // for i
// =-=-=-=-=-=-=-
// if a match is found, resolve it and get the hier string
if ( kw_match_found ) {
float vote = 0.0;
error ret = request_vote_for_file_object(
_comm,
WRITE_OPERATION,
_key_word,
_file_obj,
_out_hier,
vote );
if ( 0.0 == vote ) {
if ( ret.code() == 0 ) {
ret.code( -1 );
}
ret.status( false );
}
return PASS( ret );
} // if kw_match_found
// =-=-=-=-=-=-=-
// NOTE:: if a kw match is not found is this an
// error or is falling through acceptable
}
// =-=-=-=-=-=-=-
// either no kw match or no kw, so pick one...
return resolve_hier_for_create(
_comm,
_file_obj,
_key_word,
_data_obj_inp,
_out_hier );
} // resolve_hier_for_create_or_open
// =-=-=-=-=-=-=-
// 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