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#include "coordinator.h"
#include "pthread.h"
#include "nanomsg/nn.h"
#include "nanomsg/survey.h"
#include "json-c/json.h"
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#define WIN32_MEAN_AND_LEAN
#include <Winsock2.h>
#else
#include <unistd.h>
#endif
#include "system.h"
static pthread_t coordinator_thread;
static int coordinator_sock;
static int coordinator_must_terminate = 0;
int nof_workers = 0;
worker_t worker[MAX_WORKERS];
static char *create_discover_answer( )
{
json_object *obj = json_object_new_object( );
json_object *op = json_object_new_string( "register" );
json_object_object_add( obj, "op", op );
/* we are a coordinator */
json_object *role = json_object_new_string( "coordinator" );
json_object_object_add( obj, "role", role );
/* return hostname for unique identification (maybe better
* or additionally the MAC of the first interface or hostid?)
*/
char hostname[100];
gethostname( hostname, sizeof( hostname ) );
json_object *host = json_object_new_string( hostname );
json_object_object_add( obj, "host", host );
/* number of CPUs, important so we don't overload the
* server (TODO: should maybe be configurable how many
* CPUs we want to use in absolute, percentage use or
* leave free
*/
unsigned int nofCpus = system_available_cpus( );
json_object *cpus = json_object_new_int( nofCpus );
json_object_object_add( obj, "cpus", cpus );
/* Operating system running on the coordinator, this is
* important so we know what we can run on the system
* directly
*/
char os_name[100];
system_os( os_name, sizeof( os_name ) );
json_object *os = json_object_new_string( os_name );
json_object_object_add( obj, "os", os );
/* system architecture, important whether we can run chrooted
* environments as workers directly without an virtualizer
*/
char machine_arch[100];
system_arch( machine_arch, sizeof( machine_arch ) );
json_object *arch = json_object_new_string( machine_arch );
json_object_object_add( obj, "arch", arch );
json_object *worker_array_obj = json_object_new_array( );
for( int i = 0; i < nof_workers; i++ ) {
worker_t *w = &worker[i];
json_object *worker_obj = json_object_new_object( );
json_object *name_obj = json_object_new_string( w->name );
json_object_object_add( worker_obj, "name", name_obj );
json_object *mode_obj = json_object_new_string( worker_exection_mode_str( w->mode ) );
json_object_object_add( worker_obj, "mode", mode_obj );
if( w->mode != WORKER_EXECUTION_DISABLED ) {
json_object *command_obj = json_object_new_string( w->command );
json_object_object_add( worker_obj, "command", command_obj );
}
json_object_array_add( worker_array_obj, worker_obj );
}
json_object_object_add( obj, "workers", worker_array_obj );
/* produce message as string, caller must free it */
const char *msg = json_object_to_json_string( obj );
char *res = strdup( msg );
json_object_put( obj );
return res;
}
static void *coordinator_func( void *thread_data )
{
char *control = (char *)thread_data;
coordinator_sock = nn_socket( AF_SP, NN_RESPONDENT );
(void)nn_connect( coordinator_sock, control );
printf( "coordinator connected to %s\n", control );
while( !coordinator_must_terminate ) {
printf( "coordinator idle: %d\n", coordinator_must_terminate );
char *answer = NULL;
int bytes = nn_recv( coordinator_sock, &answer, NN_MSG, 0 );
if( coordinator_must_terminate ) continue;
if( bytes >= 0 ) {
json_object *recv_obj = json_tokener_parse( answer );
const char *recv_obj_str = json_object_to_json_string( recv_obj );
printf( "coordinator received: %s\n", recv_obj_str );
json_object *op_obj;
json_object_object_get_ex( recv_obj, "op", &op_obj );
const char *op = json_object_get_string( op_obj );
if( strcmp( op, "discover" ) == 0 ) {
char *msg = create_discover_answer( );
size_t msg_size = strlen( msg ) + 1;
printf( "coordinator send: %s\n", msg );
bytes = nn_send( coordinator_sock, msg, msg_size, 0 );
if( bytes < 0 ) {
if( errno == ETERM ) {
coordinator_must_terminate = 1;
continue;
} else {
fprintf( stderr, "ERROR: nn_send returned %d: %s (%d)\n",
bytes, nn_strerror( errno ), errno );
}
}
if( bytes != msg_size ) {
fprintf( stderr, "ERROR: truncated message!" );
}
free( msg );
}
json_object_put( recv_obj );
nn_freemsg( answer );
}
if( bytes < 0 ) {
if( errno == EAGAIN || errno == EINTR ) {
continue;
} else if( errno == ETERM ) {
coordinator_must_terminate = 1;
continue;
} else {
fprintf( stderr, "ERROR: nn_recv returned %d: %s (%d)\n",
bytes, nn_strerror( errno ), errno );
}
}
}
(void)nn_shutdown( coordinator_sock, 0 );
puts( "coordinator disconnected" );
return NULL;
}
int coordinator_init( const char *control )
{
pthread_attr_t attr;
int res;
coordinator_must_terminate = 0;
nof_workers = 0;
res = pthread_attr_init( &attr );
if( res != 0 ) {
return 1;
}
res = pthread_create( &coordinator_thread, &attr, coordinator_func, (void *)control );
if( res != 0 ) {
return 1;
}
return 0;
}
void coordinator_terminate( )
{
coordinator_must_terminate = 1;
nn_term( );
}
static void free_workers( )
{
for( int i = 0; i < nof_workers; i++ ) {
worker_t *w = &worker[i];
free( w->name );
free( w->command );
}
}
int coordinator_free( )
{
void *result;
int res;
res = pthread_join( coordinator_thread, &result );
if( res != 0 ) {
return 1;
}
free_workers( );
return 0;
}
int coordinator_add_worker( const char *name, worker_execution_mode_t mode, const char *command )
{
if( nof_workers >= MAX_WORKERS ) {
fprintf( stderr, "Can't define more workers, limit reached!\n" );
return -1;
}
worker_t *w = &worker[nof_workers];
w->name = strdup( name );
w->mode = mode;
if( command != NULL ) {
w->command = strdup( command );
} else {
w->mode = WORKER_EXECUTION_DISABLED;
}
nof_workers++;
return 0;
}
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