/**
* Allocate a new service for the gateway to support
*
*
* @param servname The service name
* @param router Name of the router module this service uses
*
* @return The newly created service or NULL if an error occured
*/
SERVICE *
service_alloc(char *servname, char *router)
{
SERVICE *service;
if ((service = (SERVICE *)malloc(sizeof(SERVICE))) == NULL)
return NULL;
if ((service->router = load_module(router, MODULE_ROUTER)) == NULL)
{
char* home = get_maxscale_home();
char* ldpath = getenv("LD_LIBRARY_PATH");
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Unable to load %s module \"%s\".\n\t\t\t"
" Ensure that lib%s.so exists in one of the "
"following directories :\n\t\t\t "
"- %s/modules\n\t\t\t - %s",
MODULE_ROUTER,
router,
router,
home,
ldpath)));
free(service);
return NULL;
}
service->name = strdup(servname);
service->routerModule = strdup(router);
service->version_string = NULL;
memset(&service->stats, 0, sizeof(SERVICE_STATS));
service->ports = NULL;
service->stats.started = time(0);
service->state = SERVICE_STATE_ALLOC;
service->credentials.name = NULL;
service->credentials.authdata = NULL;
service->enable_root = 0;
service->routerOptions = NULL;
service->databases = NULL;
service->svc_config_param = NULL;
service->svc_config_version = 0;
service->filters = NULL;
service->n_filters = 0;
service->weightby = 0;
spinlock_init(&service->spin);
spinlock_init(&service->users_table_spin);
memset(&service->rate_limit, 0, sizeof(SERVICE_REFRESH_RATE));
spinlock_acquire(&service_spin);
service->next = allServices;
allServices = service;
spinlock_release(&service_spin);
return service;
}
/**
* Allocate a new service for the gateway to support
*
*
* @param servname The service name
* @param router Name of the router module this service uses
*
* @return The newly created service or NULL if an error occurred
*/
SERVICE *
service_alloc(const char *servname, const char *router)
{
SERVICE *service;
if ((service = (SERVICE *)calloc(1, sizeof(SERVICE))) == NULL)
return NULL;
if ((service->router = load_module(router, MODULE_ROUTER)) == NULL)
{
char* home = get_maxscale_home();
char* ldpath = getenv("LD_LIBRARY_PATH");
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Unable to load %s module \"%s\".\n\t\t\t"
" Ensure that lib%s.so exists in one of the "
"following directories :\n\t\t\t "
"- %s/modules\n\t\t\t - %s",
MODULE_ROUTER,
router,
router,
home,
ldpath)));
free(service);
return NULL;
}
service->name = strdup(servname);
service->routerModule = strdup(router);
service->users_from_all = false;
service->resources = NULL;
if (service->name == NULL || service->routerModule == NULL)
{
if (service->name)
free(service->name);
free(service);
return NULL;
}
service->stats.started = time(0);
service->state = SERVICE_STATE_ALLOC;
spinlock_init(&service->spin);
spinlock_init(&service->users_table_spin);
spinlock_acquire(&service_spin);
service->next = allServices;
allServices = service;
spinlock_release(&service_spin);
return service;
}
/**
* Load the dynamic library related to a gateway module. The routine
* will look for library files in the current directory,
* $MAXSCALE_HOME/modules and /usr/local/skysql/MaxScale/modules.
*
* @param module Name of the module to load
* @param type Type of module, used purely for registration
* @return The module specific entry point structure or NULL
*/
void *
load_module(const char *module, const char *type)
{
char *home, *version;
char fname[MAXPATHLEN];
void *dlhandle, *sym;
char *(*ver)();
void *(*ep)(), *modobj;
MODULES *mod;
MODULE_INFO *mod_info = NULL;
if ((mod = find_module(module)) == NULL)
{
/*<
* The module is not already loaded
*
* Search of the shared object.
*/
sprintf(fname, "./lib%s.so", module);
if (access(fname, F_OK) == -1)
{
home = get_maxscale_home ();
sprintf(fname, "%s/modules/lib%s.so", home, module);
if (access(fname, F_OK) == -1)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Unable to find library for "
"module: %s.",
module)));
return NULL;
}
}
if ((dlhandle = dlopen(fname, RTLD_NOW|RTLD_LOCAL)) == NULL)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Unable to load library for module: "
"%s\n\n\t\t %s."
"\n\n",
module,
dlerror())));
return NULL;
}
if ((sym = dlsym(dlhandle, "version")) == NULL)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Version interface not supported by "
"module: %s\n\t\t\t %s.",
module,
dlerror())));
dlclose(dlhandle);
return NULL;
}
ver = sym;
version = ver();
/*
* If the module has a ModuleInit function cal it now.
*/
if ((sym = dlsym(dlhandle, "ModuleInit")) != NULL)
{
void (*ModuleInit)() = sym;
ModuleInit();
}
if ((sym = dlsym(dlhandle, "info")) != NULL)
{
int fatal = 0;
mod_info = sym;
if (strcmp(type, MODULE_PROTOCOL) == 0
&& mod_info->modapi != MODULE_API_PROTOCOL)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Module '%s' does not implement "
"the protocol API.\n",
module)));
fatal = 1;
}
if (strcmp(type, MODULE_ROUTER) == 0
&& mod_info->modapi != MODULE_API_ROUTER)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Module '%s' does not implement "
"the router API.\n",
module)));
fatal = 1;
}
if (strcmp(type, MODULE_MONITOR) == 0
&& mod_info->modapi != MODULE_API_MONITOR)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Module '%s' does not implement "
"the monitor API.\n",
module)));
fatal = 1;
}
if (strcmp(type, MODULE_FILTER) == 0
&& mod_info->modapi != MODULE_API_FILTER)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Module '%s' does not implement "
"the filter API.\n",
module)));
fatal = 1;
}
if (fatal)
{
dlclose(dlhandle);
return NULL;
}
}
if ((sym = dlsym(dlhandle, "GetModuleObject")) == NULL)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Expected entry point interface missing "
"from module: %s\n\t\t\t %s.",
module,
dlerror())));
dlclose(dlhandle);
return NULL;
}
ep = sym;
modobj = ep();
LOGIF(LM, (skygw_log_write_flush(
LOGFILE_MESSAGE,
"Loaded module %s: %s from %s",
module,
version,
fname)));
register_module(module, type, dlhandle, version, modobj, mod_info);
}
else
{
/*
* The module is already loaded, get the entry points again and
* return a reference to the already loaded module.
*/
modobj = mod->modobj;
}
return modobj;
}
