instance.c

   1 #include "procd.h"
   2 #include "service.h"
   3 #include "instance.h"
   4
   5 enum {
   6         INSTANCE_ATTR_COMMAND,
   7         INSTANCE_ATTR_ENV,
   8         INSTANCE_ATTR_DATA,
   9         __INSTANCE_ATTR_MAX
  10 };
  11
  12 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  13         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  14         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  15         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  16 };
  17
  18 void
  19 instance_start(struct service_instance *in)
  20 {
  21         in->restart = false;
  22 }
  23
  24 static void
  25 instance_timeout(struct uloop_timeout *t)
  26 {
  27         struct service_instance *in;
  28
  29         in = container_of(t, struct service_instance, timeout);
  30         kill(in->proc.pid, SIGKILL);
  31         uloop_process_delete(&in->proc);
  32         in->proc.cb(&in->proc, -1);
  33 }
  34
  35 static void
  36 instance_exit(struct uloop_process *p, int ret)
  37 {
  38         struct service_instance *in;
  39
  40         in = container_of(p, struct service_instance, proc);
  41         uloop_timeout_cancel(&in->timeout);
  42         if (in->restart)
  43                 instance_start(in);
  44 }
  45
  46 void
  47 instance_stop(struct service_instance *in, bool restart)
  48 {
  49         if (!in->proc.pending)
  50                 return;
  51
  52         kill(in->proc.pid, SIGTERM);
  53 }
  54
  55 static bool
  56 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
  57 {
  58         if (!in->valid)
  59                 return true;
  60
  61         if (!blob_attr_equal(in->command, in_new->command))
  62                 return true;
  63
  64         if (!blobmsg_list_equal(&in->env, &in_new->env))
  65                 return true;
  66
  67         if (!blobmsg_list_equal(&in->data, &in_new->data))
  68                 return true;
  69
  70         return false;
  71 }
  72
  73 static bool
  74 instance_config_parse(struct service_instance *in)
  75 {
  76         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
  77         struct blob_attr *cur;
  78
  79         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
  80                 blobmsg_data(in->config), blobmsg_data_len(in->config));
  81         if (!tb[INSTANCE_ATTR_COMMAND])
  82                 return false;
  83
  84         if ((cur = tb[INSTANCE_ATTR_ENV]))
  85                 blobmsg_list_fill(&in->env, blobmsg_data(cur), blobmsg_data_len(cur));
  86
  87         if ((cur = tb[INSTANCE_ATTR_DATA]))
  88                 blobmsg_list_fill(&in->data, blobmsg_data(cur), blobmsg_data_len(cur));
  89
  90         return true;
  91 }
  92
  93 static void
  94 instance_config_cleanup(struct service_instance *in)
  95 {
  96         blobmsg_list_free(&in->env);
  97         blobmsg_list_free(&in->data);
  98 }
  99
 100 static void
 101 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 102 {
 103         instance_config_cleanup(in);
 104         blobmsg_list_move(&in->env, &in_src->env);
 105         blobmsg_list_move(&in->data, &in_src->data);
 106         in->command = in_src->command;
 107 }
 108
 109 bool
 110 instance_update(struct service_instance *in, struct service_instance *in_new)
 111 {
 112         bool changed = instance_config_changed(in, in_new);
 113
 114         in->config = in_new->config;
 115         if (!changed)
 116                 return false;
 117
 118         instance_stop(in, true);
 119         instance_config_move(in, in_new);
 120         return true;
 121 }
 122
 123 void
 124 instance_free(struct service_instance *in)
 125 {
 126         uloop_process_delete(&in->proc);
 127         uloop_timeout_cancel(&in->timeout);
 128         instance_config_cleanup(in);
 129         free(in);
 130 }
 131
 132 void
 133 instance_init(struct service_instance *in, struct blob_attr *config)
 134 {
 135         in->config = config;
 136         in->timeout.cb = instance_timeout;
 137         in->proc.cb = instance_exit;
 138
 139         blobmsg_list_simple_init(&in->env);
 140         blobmsg_list_simple_init(&in->data);
 141         in->valid = instance_config_parse(in);
 142 }
 143
 144