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#include <unistd.h>
#include "procd.h"
#include "service.h"
#include "instance.h"
enum {
INSTANCE_ATTR_COMMAND,
INSTANCE_ATTR_ENV,
INSTANCE_ATTR_DATA,
__INSTANCE_ATTR_MAX
};
static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
[INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
[INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
[INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
};
static void
instance_run(struct service_instance *in)
{
struct blobmsg_list_node *var;
struct blob_attr *cur;
char **argv;
int argc = 1; /* NULL terminated */
int rem;
blobmsg_for_each_attr(cur, in->command, rem)
argc++;
blobmsg_list_for_each(&in->env, var)
setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
argv = alloca(sizeof(char *) * argc);
argc = 0;
blobmsg_for_each_attr(cur, in->command, rem)
argv[argc++] = blobmsg_data(cur);
argv[argc] = NULL;
execvp(argv[0], argv);
exit(127);
}
void
instance_start(struct service_instance *in)
{
int pid;
if (in->proc.pending)
return;
in->restart = false;
if (!in->valid)
return;
pid = fork();
if (pid < 0)
return;
if (!pid) {
instance_run(in);
return;
}
DPRINTF("Started instance %s::%s\n", in->srv->name, in->name);
in->proc.pid = pid;
uloop_process_add(&in->proc);
}
static void
instance_timeout(struct uloop_timeout *t)
{
struct service_instance *in;
in = container_of(t, struct service_instance, timeout);
kill(in->proc.pid, SIGKILL);
uloop_process_delete(&in->proc);
in->proc.cb(&in->proc, -1);
}
static void
instance_exit(struct uloop_process *p, int ret)
{
struct service_instance *in;
in = container_of(p, struct service_instance, proc);
DPRINTF("Instance %s::%s exit with error code %d\n", in->srv->name, in->name, ret);
uloop_timeout_cancel(&in->timeout);
if (in->restart)
instance_start(in);
}
void
instance_stop(struct service_instance *in, bool restart)
{
if (!in->proc.pending)
return;
kill(in->proc.pid, SIGTERM);
}
static bool
instance_config_changed(struct service_instance *in, struct service_instance *in_new)
{
if (!in->valid)
return true;
if (!blob_attr_equal(in->command, in_new->command))
return true;
if (!blobmsg_list_equal(&in->env, &in_new->env))
return true;
if (!blobmsg_list_equal(&in->data, &in_new->data))
return true;
return false;
}
static bool
instance_config_parse(struct service_instance *in)
{
struct blob_attr *tb[__INSTANCE_ATTR_MAX];
struct blob_attr *cur, *cur2;
int argc = 0;
int rem;
blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
blobmsg_data(in->config), blobmsg_data_len(in->config));
cur = tb[INSTANCE_ATTR_COMMAND];
if (!cur)
return false;
if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
return false;
blobmsg_for_each_attr(cur2, cur, rem) {
argc++;
break;
}
if (!argc)
return false;
in->command = cur;
if ((cur = tb[INSTANCE_ATTR_ENV])) {
if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
return false;
blobmsg_list_fill(&in->env, blobmsg_data(cur), blobmsg_data_len(cur), false);
}
if ((cur = tb[INSTANCE_ATTR_DATA])) {
if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
return false;
blobmsg_list_fill(&in->data, blobmsg_data(cur), blobmsg_data_len(cur), false);
}
return true;
}
static void
instance_config_cleanup(struct service_instance *in)
{
blobmsg_list_free(&in->env);
blobmsg_list_free(&in->data);
}
static void
instance_config_move(struct service_instance *in, struct service_instance *in_src)
{
instance_config_cleanup(in);
blobmsg_list_move(&in->env, &in_src->env);
blobmsg_list_move(&in->data, &in_src->data);
in->command = in_src->command;
in->name = in_src->name;
}
bool
instance_update(struct service_instance *in, struct service_instance *in_new)
{
bool changed = instance_config_changed(in, in_new);
in->config = in_new->config;
if (!changed)
return false;
in->restart = true;
instance_stop(in, true);
instance_config_move(in, in_new);
return true;
}
void
instance_free(struct service_instance *in)
{
uloop_process_delete(&in->proc);
uloop_timeout_cancel(&in->timeout);
instance_config_cleanup(in);
free(in);
}
void
instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
{
in->srv = s;
in->name = blobmsg_name(config);
in->config = config;
in->timeout.cb = instance_timeout;
in->proc.cb = instance_exit;
blobmsg_list_simple_init(&in->env);
blobmsg_list_simple_init(&in->data);
in->valid = instance_config_parse(in);
}
void instance_dump(struct blob_buf *b, struct service_instance *in)
{
void *i;
i = blobmsg_open_table(b, in->name);
blobmsg_add_u8(b, "running", in->proc.pending);
if (in->proc.pending)
blobmsg_add_u32(b, "pid", in->proc.pid);
blobmsg_add_blob(b, in->command);
blobmsg_close_table(b, i);
}
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