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#include <lighttpd/angel_base.h>
static void sigint_cb(liEventBase *watcher, int events) {
liServer *srv = LI_CONTAINER_OF(li_event_get_loop_(watcher), liServer, loop);
UNUSED(events);
li_server_stop(srv);
}
static void sigpipe_cb(liEventBase *watcher, int events) {
/* ignore */
UNUSED(watcher); UNUSED(events);
}
liServer* li_server_new(const gchar *module_dir, gboolean module_resident) {
liServer *srv = g_slice_new0(liServer);
li_event_loop_init(&srv->loop, ev_default_loop(0));
li_event_signal_init(&srv->loop, &srv->sig_w_INT, sigint_cb, SIGINT);
li_event_signal_init(&srv->loop, &srv->sig_w_TERM, sigint_cb, SIGTERM);
li_event_signal_init(&srv->loop, &srv->sig_w_PIPE, sigpipe_cb, SIGPIPE);
li_log_init(srv);
li_plugins_init(srv, module_dir, module_resident);
return srv;
}
void li_server_free(liServer* srv) {
li_plugins_clear(srv);
li_log_clean(srv);
li_event_clear(&srv->sig_w_INT);
li_event_clear(&srv->sig_w_TERM);
li_event_clear(&srv->sig_w_PIPE);
li_event_loop_clear(&srv->loop);
ev_default_destroy();
g_slice_free(liServer, srv);
}
void li_server_stop(liServer *srv) {
li_event_stop(&srv->sig_w_INT);
li_event_stop(&srv->sig_w_TERM);
li_plugins_config_load(srv, NULL);
li_event_loop_end(&srv->loop);
}
static void instance_angel_call_cb(liAngelConnection *acon,
const gchar *mod, gsize mod_len, const gchar *action, gsize action_len,
gint32 id,
GString *data) {
liInstance *i = (liInstance*) acon->data;
liServer *srv = i->srv;
liPlugins *ps = &srv->plugins;
liPlugin *p;
liPluginHandleCallCB cb;
UNUSED(mod_len);
UNUSED(action_len);
p = g_hash_table_lookup(ps->ht_plugins, mod);
if (!p) {
GString *errstr = g_string_sized_new(0);
GError *err = NULL;
g_string_printf(errstr, "Plugin '%s' not available in lighttpd-angel", mod);
if (!li_angel_send_result(acon, id, errstr, NULL, NULL, &err)) {
ERROR(srv, "Couldn't send result: %s", err->message);
g_error_free(err);
}
return;
}
cb = (liPluginHandleCallCB)(intptr_t) g_hash_table_lookup(p->angel_callbacks, action);
if (!cb) {
GString *errstr = g_string_sized_new(0);
GError *err = NULL;
g_string_printf(errstr, "Action '%s' not available in plugin '%s' of lighttpd-angel", action, mod);
if (!li_angel_send_result(acon, id, errstr, NULL, NULL, &err)) {
ERROR(srv, "Couldn't send result: %s", err->message);
g_error_free(err);
}
return;
}
cb(srv, p, i, id, data);
}
static void instance_angel_close_cb(liAngelConnection *acon, GError *err) {
liInstance *i = (liInstance*) acon->data;
liServer *srv = i->srv;
gboolean hide_error = FALSE;
if (err) {
if (LI_INSTANCE_FINISHED == i->s_dest &&
LI_ANGEL_CONNECTION_RESET == err->code &&
LI_ANGEL_CONNECTION_ERROR == err->domain) hide_error = TRUE;
}
if (!hide_error)
ERROR(srv, "angel connection closed: %s", err ? err->message : g_strerror(errno));
if (err) g_error_free(err);
i->acon = NULL;
li_angel_connection_free(acon);
}
static void instance_child_cb(liEventBase *watcher, int events) {
liInstance *i = LI_CONTAINER_OF(li_event_child_from(watcher), liInstance, child_watcher);
liInstanceState news;
int status = li_event_child_status(&i->child_watcher);
UNUSED(events);
if (i->s_dest == LI_INSTANCE_FINISHED) {
if (WIFEXITED(status)) {
if (0 != WEXITSTATUS(status)) {
ERROR(i->srv, "child %i died with exit status %i", i->proc->child_pid, WEXITSTATUS(status));
} /* exit status 0 is ok, no message */
} else if (WIFSIGNALED(status)) {
ERROR(i->srv, "child %i died: killed by '%s' (%i)", i->proc->child_pid, g_strsignal(WTERMSIG(status)), WTERMSIG(status));
} else {
ERROR(i->srv, "child %i died with unexpected stat_val %i", i->proc->child_pid, status);
}
news = LI_INSTANCE_FINISHED;
} else {
if (WIFEXITED(status)) {
ERROR(i->srv, "child %i died with exit status %i", i->proc->child_pid, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
ERROR(i->srv, "child %i died: killed by %s", i->proc->child_pid, g_strsignal(WTERMSIG(status)));
} else {
ERROR(i->srv, "child %i died with unexpected stat_val %i", i->proc->child_pid, status);
}
if (i->s_cur == LI_INSTANCE_DOWN) {
ERROR(i->srv, "spawning child %i failed, not restarting", i->proc->child_pid);
news = i->s_dest = LI_INSTANCE_FINISHED; /* TODO: retry spawn later? */
} else {
news = LI_INSTANCE_DOWN;
}
}
li_proc_free(i->proc);
i->proc = NULL;
li_angel_connection_free(i->acon);
i->acon = NULL;
li_event_clear(&i->child_watcher);
li_instance_state_reached(i, news);
li_instance_release(i);
}
static void instance_spawn_setup(gpointer ctx) {
int *confd = ctx;
if (confd[1] != 0) {
dup2(confd[1], 0);
close(confd[1]);
}
dup2(STDERR_FILENO, STDOUT_FILENO);
}
static void instance_spawn(liInstance *i) {
int confd[2];
if (-1 == socketpair(AF_UNIX, SOCK_STREAM, 0, confd)) {
ERROR(i->srv, "socketpair error, cannot spawn instance: %s", g_strerror(errno));
return;
}
li_fd_init(confd[0]);
li_fd_no_block(confd[1]);
i->acon = li_angel_connection_new(&i->srv->loop, confd[0], i, instance_angel_call_cb, instance_angel_close_cb);
i->proc = li_proc_new(i->srv, i->ic->cmd, i->ic->env, i->ic->uid, i->ic->gid,
i->ic->username != NULL ? i->ic->username->str : NULL, i->ic->rlim_core, i->ic->rlim_nofile, instance_spawn_setup, confd);
if (!i->proc) return;
close(confd[1]);
li_event_clear(&i->child_watcher);
li_event_child_init(&i->srv->loop, &i->child_watcher, instance_child_cb, i->proc->child_pid);
i->s_cur = LI_INSTANCE_DOWN;
li_instance_acquire(i);
DEBUG(i->srv, "Instance (%i) spawned: %s", i->proc->child_pid, i->ic->cmd[0]);
}
liInstance* li_server_new_instance(liServer *srv, liInstanceConf *ic) {
liInstance *i;
i = g_slice_new0(liInstance);
i->refcount = 1;
i->srv = srv;
li_instance_conf_acquire(ic);
i->ic = ic;
i->s_cur = i->s_dest = LI_INSTANCE_DOWN;
i->resources = g_ptr_array_new();
return i;
}
gboolean li_instance_replace(liInstance *oldi, liInstance *newi) {
if (oldi->replace_by || newi->replace) return FALSE;
oldi->replace_by = newi;
newi->replace = oldi;
li_instance_acquire(oldi);
li_instance_acquire(newi);
li_instance_set_state(newi, LI_INSTANCE_WARMUP);
return TRUE;
}
static void li_instance_unset_replace(liInstance *oldi, liInstance *newi) {
g_assert(newi == oldi->replace_by); oldi->replace_by = NULL;
g_assert(oldi == newi->replace); newi->replace = NULL;
li_angel_plugin_replaced_instance(oldi->srv, oldi, newi);
li_instance_release(oldi);
li_instance_release(newi);
}
void li_instance_set_state(liInstance *i, liInstanceState s) {
if (i->s_dest == s) return;
switch (s) {
case LI_INSTANCE_DOWN:
case LI_INSTANCE_SUSPENDING:
ERROR(i->srv, "Invalid destination state %i", s);
return; /* cannot set this */
case LI_INSTANCE_WARMUP:
case LI_INSTANCE_SUSPENDED:
case LI_INSTANCE_RUNNING:
case LI_INSTANCE_FINISHED:
break;
}
i->s_dest = s;
if (!i->proc && LI_INSTANCE_FINISHED != s) {
instance_spawn(i);
} else {
GError *error = NULL;
switch (s) {
case LI_INSTANCE_DOWN:
case LI_INSTANCE_SUSPENDING:
break; /* cannot be set */
case LI_INSTANCE_WARMUP:
li_angel_send_simple_call(i->acon, CONST_STR_LEN("core"), CONST_STR_LEN("warmup"), NULL, &error);
break;
case LI_INSTANCE_SUSPENDED:
li_angel_send_simple_call(i->acon, CONST_STR_LEN("core"), CONST_STR_LEN("suspend"), NULL, &error);
break;
case LI_INSTANCE_RUNNING:
li_angel_send_simple_call(i->acon, CONST_STR_LEN("core"), CONST_STR_LEN("run"), NULL, &error);
break;
case LI_INSTANCE_FINISHED:
if (i->proc) {
kill(i->proc->child_pid, SIGTERM);
} else {
li_instance_state_reached(i, LI_INSTANCE_FINISHED);
}
break;
}
if (error) {
GERROR(i->srv, error, "set state %i failed, killing instance:", s);
g_error_free(error);
if (i->proc) {
kill(i->proc->child_pid, SIGTERM);
} else {
li_instance_state_reached(i, LI_INSTANCE_FINISHED);
}
}
}
}
void li_instance_state_reached(liInstance *i, liInstanceState s) {
GError *error = NULL;
i->s_cur = s;
switch (s) {
case LI_INSTANCE_DOWN:
/* last child died */
if (i->s_dest == LI_INSTANCE_FINISHED) {
i->s_cur = LI_INSTANCE_FINISHED;
} else if (!i->srv->one_shot) {
instance_spawn(i);
}
break;
case LI_INSTANCE_SUSPENDED:
if (i->replace_by && i->replace_by->s_dest == LI_INSTANCE_WARMUP) {
li_instance_set_state(i->replace_by, LI_INSTANCE_RUNNING);
}
switch (i->s_dest) {
case LI_INSTANCE_DOWN:
break; /* impossible */
case LI_INSTANCE_SUSPENDED:
break;
case LI_INSTANCE_WARMUP:
/* make sure we move to SILENT after we spawned the instance */
li_angel_send_simple_call(i->acon, CONST_STR_LEN("core"), CONST_STR_LEN("warmup"), NULL, &error);
break;
case LI_INSTANCE_RUNNING:
/* make sure we move to RUNNING after we spawned the instance */
li_angel_send_simple_call(i->acon, CONST_STR_LEN("core"), CONST_STR_LEN("run"), NULL, &error);
break;
case LI_INSTANCE_SUSPENDING:
case LI_INSTANCE_FINISHED:
break; /* nothing to do, instance should already know what to do */
}
break;
case LI_INSTANCE_WARMUP:
if (i->replace) {
/* stop old instance */
li_instance_set_state(i->replace, LI_INSTANCE_FINISHED);
}
break;
case LI_INSTANCE_RUNNING:
/* nothing to do, instance should already know what to do */
break;
case LI_INSTANCE_SUSPENDING:
/* nothing to do, instance should already know what to do */
break;
case LI_INSTANCE_FINISHED:
if (i->replace) {
ERROR(i->srv, "%s", "Replacing instance failed, continue old instance");
li_instance_set_state(i->replace, LI_INSTANCE_RUNNING);
li_instance_unset_replace(i->replace, i);
} else if (i->s_dest == LI_INSTANCE_FINISHED) {
if (i->replace_by) {
INFO(i->srv, "%s", "Instance replaced");
if (i->replace_by->s_dest == LI_INSTANCE_WARMUP) {
li_instance_set_state(i->replace_by, LI_INSTANCE_RUNNING);
}
li_instance_unset_replace(i, i->replace_by);
}
}
break;
}
if (error) {
GERROR(i->srv, error, "reaching state %i failed, killing instance:", s);
g_error_free(error);
if (i->proc) {
kill(i->proc->child_pid, SIGTERM);
} else {
li_instance_state_reached(i, LI_INSTANCE_FINISHED);
}
} else {
li_angel_plugin_instance_reached_state(i->srv, i, s);
}
}
void li_instance_release(liInstance *i) {
liServer *srv;
liInstance *t;
guint j;
if (!i) return;
srv = i->srv;
g_assert(g_atomic_int_get(&i->refcount) > 0);
if (!g_atomic_int_dec_and_test(&i->refcount)) return;
g_assert(!i->proc);
DEBUG(srv, "%s", "instance released");
li_instance_conf_release(i->ic);
i->ic = NULL;
t = i->replace; i->replace = NULL;
li_instance_release(t);
t = i->replace_by; i->replace_by = NULL;
li_instance_release(t);
for (j = 0; j < i->resources->len; j++) {
liInstanceResource *res = g_ptr_array_index(i->resources, j);
res->ndx = -1;
res->free_cb(srv, i, res->plugin, res);
}
g_ptr_array_free(i->resources, TRUE);
g_slice_free(liInstance, i);
}
void li_instance_acquire(liInstance *i) {
assert(g_atomic_int_get(&i->refcount) > 0);
g_atomic_int_inc(&i->refcount);
}
liInstanceConf* li_instance_conf_new(gchar **cmd, gchar **env, GString *username, uid_t uid, gid_t gid, gint64 rlim_core, gint64 rlim_nofile) {
liInstanceConf *ic = g_slice_new0(liInstanceConf);
ic->refcount = 1;
ic->cmd = cmd;
ic->env = env;
if (username) {
ic->username = g_string_new_len(GSTR_LEN(username));
}
ic->uid = uid;
ic->gid = gid;
ic->rlim_core = rlim_core;
ic->rlim_nofile = rlim_nofile;
return ic;
}
void li_instance_conf_release(liInstanceConf *ic) {
if (!ic) return;
assert(g_atomic_int_get(&ic->refcount) > 0);
if (!g_atomic_int_dec_and_test(&ic->refcount)) return;
if (ic->username) g_string_free(ic->username, TRUE);
g_strfreev(ic->cmd);
g_strfreev(ic->env);
g_slice_free(liInstanceConf, ic);
}
void li_instance_conf_acquire(liInstanceConf *ic) {
assert(g_atomic_int_get(&ic->refcount) > 0);
g_atomic_int_inc(&ic->refcount);
}
void li_instance_add_resource(liInstance *i, liInstanceResource *res, liInstanceResourceFreeCB free_cb, liPlugin *p, gpointer data) {
res->free_cb = free_cb;
res->data = data;
res->plugin = p;
res->ndx = i->resources->len;
g_ptr_array_add(i->resources, res);
}
void li_instance_rem_resource(liInstance *i, liInstanceResource *res) {
liInstanceResource *res2;
g_assert(res == g_ptr_array_index(i->resources, res->ndx));
g_ptr_array_remove_index_fast(i->resources, res->ndx);
res2 = g_ptr_array_index(i->resources, res->ndx);
res2->ndx = res->ndx;
}