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/* wydawca - automatic release submission daemon
Copyright (C) 2007-2012 Sergey Poznyakoff
Wydawca is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Wydawca is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with wydawca. If not, see <http://www.gnu.org/licenses/>. */
#include "wydawca.h"
#include <ltdl.h>
static struct grecs_symtab *modtab;
struct grecs_list *module_load_path, *module_prepend_load_path;
static void
modfree(void *p)
{
struct module *mod = p;
free(mod->locus.beg.file);
free(mod->locus.end.file);
free(mod->path);
free(mod->name);
free(mod);
}
static struct module *
modinstall(const char *name, const char *path, grecs_locus_t *loc)
{
struct module key;
struct module *ent;
int install = 1;
if (!modtab) {
modtab = grecs_symtab_create(sizeof(struct module),
NULL,
NULL,
NULL,
NULL,
modfree);
if (!modtab)
grecs_alloc_die();
}
key.name = (char*) name;
ent = grecs_symtab_lookup_or_install(modtab, &key, &install);
if (!ent)
grecs_alloc_die();
if (install == 0) {
grecs_error(loc, 0, _("module %s already declared"), name);
grecs_error(&ent->locus, 0, _("previously declared here"));
return NULL;
}
ent->path = grecs_strdup(path);
ent->locus.beg.file = grecs_strdup(loc->beg.file);
ent->locus.beg.line = loc->beg.line;
ent->locus.beg.col = loc->beg.col;
ent->locus.end.file = grecs_strdup(loc->end.file);
ent->locus.end.line = loc->end.line;
ent->locus.end.col = loc->end.col;
return ent;
}
static struct module *
modlookup(const char *name)
{
struct module key;
if (!modtab)
return NULL;
key.name = (char*) name;
return grecs_symtab_lookup_or_install(modtab, &key, NULL);
}
int
cb_module(enum grecs_callback_command cmd, grecs_node_t *node,
void *varptr, void *cb_data)
{
grecs_value_t *name;
grecs_value_t *path;
grecs_locus_t *locus = &node->locus;
grecs_value_t *value = node->v.value;
if (cmd != grecs_callback_set_value) {
grecs_error(locus, 0, _("Unexpected block statement"));
return 1;
}
if (!(name = get_arg(value, 0, GRECS_TYPE_STRING)))
return 1;
if (!(path = get_arg(value, 1, GRECS_TYPE_STRING)))
return 1;
modinstall(name->v.string, path->v.string, locus);
return 0;
};
static void *
resolve_sym(struct module *mod, const char *name)
{
void *sym = lt_dlsym(mod->handle, name);
if (!sym) {
grecs_error(&mod->locus, 0,
_("module \"%s\" does not define symbol \"%s\""),
mod->name, name);
}
return sym;
}
static int
modload(void *sym, void *data)
{
struct module *mod = sym;
lt_dlhandle handle = NULL;
lt_dladvise advise = data;
if (mod->handle) {
grecs_error(&mod->locus, 0, _("already loaded"));
return 0;
}
handle = lt_dlopenadvise(mod->path, advise);
if (!handle) {
grecs_error(&mod->locus, 0,
_("cannot load module %s: %s"), mod->path,
lt_dlerror());
return 1;
}
mod->handle = handle;
mod->config = resolve_sym(mod, "config");
mod->notify = resolve_sym(mod, "notify");
return 0;
}
static int
spoolmodcfg(struct spool *spool, void *unused)
{
struct notification *np;
for (np = spool->notification; np; np = np->next) {
if (np->modname) {
struct module *mod = modlookup(np->modname);
if (!mod) {
logmsg(LOG_ERR, "spool %s: no such module: %s",
spool->tag, np->modname);
return 1;
}
if (mod->config) {
np->modcfg = mod->config(np->modnode);
if (!np->modcfg) {
logmsg(LOG_ERR,
"spool %s: failed to configure "
"module \"%s\"",
spool->tag, np->modname);
return 1;
}
}
}
}
return 0;
}
void
modules_load()
{
lt_dladvise advise = NULL;
struct grecs_list_entry *ep;
if (lt_dlinit()) {
logmsg(LOG_ERR, _("failed to initialize libtool"));
return;
}
/* Prepare load path */
if (module_prepend_load_path)
for (ep = module_prepend_load_path->head; ep; ep = ep->next)
lt_dladdsearchdir(ep->data);
lt_dladdsearchdir(WYDAWCA_MODDIR);
if (module_load_path)
for (ep = module_load_path->head; ep; ep = ep->next)
lt_dladdsearchdir(ep->data);
if (lt_dladvise_init(&advise))
logmsg(LOG_ERR, "lt_dladvise_init: %s", lt_dlerror());
else {
if (lt_dladvise_ext(&advise))
logmsg(LOG_ERR, "lt_dladvise_ext: %s", lt_dlerror());
if (lt_dladvise_global(&advise))
logmsg(LOG_ERR, "lt_dladvise_global: %s",
lt_dlerror());
}
if (grecs_symtab_enumerate(modtab, modload, NULL)) {
logmsg(LOG_CRIT, _("some modules failed to load, exiting"));
exit(EX_UNAVAILABLE);
}
lt_dladvise_destroy(&advise);
if (for_each_spool(spoolmodcfg, NULL)) {
logmsg(LOG_CRIT,
_("some modules failed to configure, exiting"));
exit(EX_UNAVAILABLE);
}
}
static char *
getfn(void *trp, const char *fmt)
{
return triplet_expand_param(fmt, trp);
}
void
module_notify(const char *name, void *modcfg,
enum notification_event ev, struct file_triplet *trp)
{
struct module *mod = modlookup(name);
if (!mod) {
logmsg(LOG_ERR, "no such module: %s", name);
return;
}
if (mod->notify)
mod->notify(modcfg, ev, getfn, trp);
}
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