service.c

   1 #include <libubox/avl-cmp.h>
   2 #include "procd.h"
   3 #include "service.h"
   4 #include "instance.h"
   5
   6 struct avl_tree services;
   7 static struct blob_buf b;
   8
   9 static void
  10 service_instance_add(struct service *s, struct blob_attr *attr)
  11 {
  12         struct service_instance *in;
  13         const char *name = blobmsg_name(attr);
  14
  15         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
  16                 return;
  17
  18         in = calloc(1, sizeof(*in));
  19         if (!in)
  20                 return;
  21
  22         instance_init(in, s, attr);
  23         vlist_add(&s->instances, &in->node, (void *) name);
  24 }
  25
  26 static void
  27 service_instance_update(struct vlist_tree *tree, struct vlist_node *node_new,
  28                         struct vlist_node *node_old)
  29 {
  30         struct service_instance *in_o = NULL, *in_n = NULL;
  31
  32         if (node_old)
  33                 in_o = container_of(node_old, struct service_instance, node);
  34
  35         if (node_new)
  36                 in_n = container_of(node_new, struct service_instance, node);
  37
  38         if (in_o && in_n) {
  39                 DPRINTF("Update instance %s::%s\n", in_o->srv->name, in_o->name);
  40                 instance_update(in_o, in_n);
  41                 instance_free(in_n);
  42         } else if (in_o) {
  43                 DPRINTF("Free instance %s::%s\n", in_o->srv->name, in_o->name);
  44                 instance_stop(in_o, false);
  45                 instance_free(in_o);
  46         } else if (in_n) {
  47                 DPRINTF("Create instance %s::%s\n", in_n->srv->name, in_n->name);
  48                 instance_start(in_n);
  49         }
  50 }
  51
  52 static struct service *
  53 service_alloc(const char *name)
  54 {
  55         struct service *s;
  56
  57         s = calloc(1, sizeof(*s));
  58         vlist_init(&s->instances, avl_strcmp, service_instance_update);
  59         s->instances.keep_old = true;
  60
  61         return s;
  62 }
  63
  64 enum {
  65         SERVICE_ATTR_NAME,
  66         SERVICE_ATTR_SCRIPT,
  67         SERVICE_ATTR_INSTANCES,
  68         __SERVICE_ATTR_MAX
  69 };
  70
  71 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
  72         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  73         [SERVICE_ATTR_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
  74         [SERVICE_ATTR_INSTANCES] = { "instances", BLOBMSG_TYPE_TABLE },
  75 };
  76
  77
  78 static int
  79 service_update(struct service *s, struct blob_attr *config, struct blob_attr **tb)
  80 {
  81         struct blob_attr *old_config = s->config;
  82         struct blob_attr *cur;
  83         int rem;
  84
  85         /* only the pointer changes, the content stays the same,
  86          * no avl update necessary */
  87         s->name = s->avl.key = blobmsg_data(tb[SERVICE_ATTR_NAME]);
  88         s->config = config;
  89
  90         if (tb[SERVICE_ATTR_INSTANCES]) {
  91                 vlist_update(&s->instances);
  92                 blobmsg_for_each_attr(cur, tb[SERVICE_ATTR_INSTANCES], rem) {
  93                         service_instance_add(s, cur);
  94                 }
  95                 vlist_flush(&s->instances);
  96         }
  97
  98         free(old_config);
  99
 100         return 0;
 101 }
 102
 103 static void
 104 service_delete(struct service *s)
 105 {
 106         vlist_flush_all(&s->instances);
 107         avl_delete(&services, &s->avl);
 108         free(s->config);
 109         free(s);
 110 }
 111
 112 static int
 113 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 114                    struct ubus_request_data *req, const char *method,
 115                    struct blob_attr *msg)
 116 {
 117         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 118         struct service *s = NULL;
 119         const char *name;
 120         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 121
 122         msg = blob_memdup(msg);
 123         if (!msg)
 124                 return UBUS_STATUS_UNKNOWN_ERROR;
 125
 126         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 127         cur = tb[SERVICE_ATTR_NAME];
 128         if (!cur)
 129                 goto free;
 130
 131         name = blobmsg_data(cur);
 132
 133         s = avl_find_element(&services, name, s, avl);
 134         if (s) {
 135                 DPRINTF("Update service %s\n", name);
 136                 return service_update(s, msg, tb);
 137         }
 138
 139         DPRINTF("Create service %s\n", name);
 140         s = service_alloc(name);
 141         if (!s)
 142                 return UBUS_STATUS_UNKNOWN_ERROR;
 143
 144         ret = service_update(s, msg, tb);
 145         if (ret)
 146                 goto free;
 147
 148         avl_insert(&services, &s->avl);
 149
 150         return 0;
 151
 152 free:
 153         free(msg);
 154         return ret;
 155 }
 156
 157 static void
 158 service_dump(struct service *s)
 159 {
 160         struct service_instance *in;
 161         void *c, *i;
 162
 163         c = blobmsg_open_table(&b, s->name);
 164         i = blobmsg_open_table(&b, "instances");
 165         vlist_for_each_element(&s->instances, in, node)
 166                 instance_dump(&b, in);
 167         blobmsg_close_table(&b, i);
 168         blobmsg_close_table(&b, c);
 169 }
 170
 171 static int
 172 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 173                     struct ubus_request_data *req, const char *method,
 174                     struct blob_attr *msg)
 175 {
 176         struct service *s;
 177
 178         blob_buf_init(&b, 0);
 179         avl_for_each_element(&services, s, avl)
 180                 service_dump(s);
 181
 182         ubus_send_reply(ctx, req, b.head);
 183
 184         return 0;
 185 }
 186
 187 enum {
 188         SERVICE_DEL_NAME,
 189         __SERVICE_DEL_MAX,
 190 };
 191
 192 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_MAX] = {
 193         [SERVICE_DEL_NAME] = { "name", BLOBMSG_TYPE_STRING },
 194 };
 195
 196
 197 static int
 198 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 199                     struct ubus_request_data *req, const char *method,
 200                     struct blob_attr *msg)
 201 {
 202         struct blob_attr *tb[__SERVICE_DEL_MAX], *cur;
 203         struct service *s, *tmp;
 204
 205         blobmsg_parse(service_del_attrs, __SERVICE_DEL_MAX, tb, blob_data(msg), blob_len(msg));
 206
 207         cur = tb[SERVICE_ATTR_NAME];
 208         if (!cur) {
 209                 avl_for_each_element_safe(&services, s, avl, tmp)
 210                         service_delete(s);
 211                 return 0;
 212         }
 213
 214         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 215         if (!s)
 216                 return UBUS_STATUS_NOT_FOUND;
 217
 218         service_delete(s);
 219         return 0;
 220 }
 221
 222 static struct ubus_method main_object_methods[] = {
 223         { .name = "list", .handler = service_handle_list },
 224         { .name = "set", .handler = service_handle_set },
 225         { .name = "delete", .handler = service_handle_delete },
 226 };
 227
 228 static struct ubus_object_type main_object_type =
 229         UBUS_OBJECT_TYPE("service", main_object_methods);
 230
 231 static struct ubus_object main_object = {
 232         .name = "service",
 233         .type = &main_object_type,
 234         .methods = main_object_methods,
 235         .n_methods = ARRAY_SIZE(main_object_methods),
 236 };
 237
 238 void procd_init_service(struct ubus_context *ctx)
 239 {
 240         avl_init(&services, avl_strcmp, false, NULL);
 241         ubus_add_object(ctx, &main_object);
 242 }