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_SET_NAME,
  66         SERVICE_SET_SCRIPT,
  67         SERVICE_SET_INSTANCES,
  68         __SERVICE_SET_MAX
  69 };
  70
  71 static const struct blobmsg_policy service_set_attrs[__SERVICE_SET_MAX] = {
  72         [SERVICE_SET_NAME] = { "name", BLOBMSG_TYPE_STRING },
  73         [SERVICE_SET_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
  74         [SERVICE_SET_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_SET_NAME]);
  88         s->config = config;
  89
  90         if (tb[SERVICE_SET_INSTANCES]) {
  91                 vlist_update(&s->instances);
  92                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_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 enum {
 113         SERVICE_ATTR_NAME,
 114         __SERVICE_ATTR_MAX,
 115 };
 116
 117 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 118         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 119 };
 120
 121
 122 static int
 123 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 124                    struct ubus_request_data *req, const char *method,
 125                    struct blob_attr *msg)
 126 {
 127         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 128         struct service *s = NULL;
 129         const char *name;
 130         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 131
 132         msg = blob_memdup(msg);
 133         if (!msg)
 134                 return UBUS_STATUS_UNKNOWN_ERROR;
 135
 136         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 137         cur = tb[SERVICE_ATTR_NAME];
 138         if (!cur)
 139                 goto free;
 140
 141         name = blobmsg_data(cur);
 142
 143         s = avl_find_element(&services, name, s, avl);
 144         if (s) {
 145                 DPRINTF("Update service %s\n", name);
 146                 return service_update(s, msg, tb);
 147         }
 148
 149         DPRINTF("Create service %s\n", name);
 150         s = service_alloc(name);
 151         if (!s)
 152                 return UBUS_STATUS_UNKNOWN_ERROR;
 153
 154         ret = service_update(s, msg, tb);
 155         if (ret)
 156                 goto free;
 157
 158         avl_insert(&services, &s->avl);
 159
 160         return 0;
 161
 162 free:
 163         free(msg);
 164         return ret;
 165 }
 166
 167 static void
 168 service_dump(struct service *s)
 169 {
 170         struct service_instance *in;
 171         void *c, *i;
 172
 173         c = blobmsg_open_table(&b, s->name);
 174         i = blobmsg_open_table(&b, "instances");
 175         vlist_for_each_element(&s->instances, in, node)
 176                 instance_dump(&b, in);
 177         blobmsg_close_table(&b, i);
 178         blobmsg_close_table(&b, c);
 179 }
 180
 181 static int
 182 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 183                     struct ubus_request_data *req, const char *method,
 184                     struct blob_attr *msg)
 185 {
 186         struct service *s;
 187
 188         blob_buf_init(&b, 0);
 189         avl_for_each_element(&services, s, avl)
 190                 service_dump(s);
 191
 192         ubus_send_reply(ctx, req, b.head);
 193
 194         return 0;
 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_ATTR_MAX], *cur;
 203         struct service *s, *tmp;
 204
 205         blobmsg_parse(service_attrs, __SERVICE_ATTR_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 int
 223 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 224                       struct ubus_request_data *req, const char *method,
 225                       struct blob_attr *msg)
 226 {
 227         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 228         struct service *s;
 229
 230         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 231
 232         cur = tb[SERVICE_ATTR_NAME];
 233         if (!cur)
 234                 return UBUS_STATUS_INVALID_ARGUMENT;
 235
 236         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 237         if (!s)
 238                 return UBUS_STATUS_NOT_FOUND;
 239
 240         if (!strcmp(method, "update_start"))
 241                 vlist_update(&s->instances);
 242         else
 243                 vlist_flush(&s->instances);
 244
 245         return 0;
 246 }
 247
 248 static struct ubus_method main_object_methods[] = {
 249         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 250         UBUS_METHOD("list", service_handle_list, service_attrs),
 251         UBUS_METHOD("delete", service_handle_delete, service_attrs),
 252         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 253         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 254 };
 255
 256 static struct ubus_object_type main_object_type =
 257         UBUS_OBJECT_TYPE("service", main_object_methods);
 258
 259 static struct ubus_object main_object = {
 260         .name = "service",
 261         .type = &main_object_type,
 262         .methods = main_object_methods,
 263         .n_methods = ARRAY_SIZE(main_object_methods),
 264 };
 265
 266 void procd_init_service(struct ubus_context *ctx)
 267 {
 268         avl_init(&services, avl_strcmp, false, NULL);
 269         ubus_add_object(ctx, &main_object);
 270 }