service.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <libubox/blobmsg_json.h>
  16 #include <libubox/avl-cmp.h>
  17 #include "procd.h"
  18 #include "service.h"
  19 #include "instance.h"
  20
  21 struct avl_tree services;
  22 static struct blob_buf b;
  23
  24 static void
  25 service_instance_add(struct service *s, struct blob_attr *attr)
  26 {
  27         struct service_instance *in;
  28
  29         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
  30                 return;
  31
  32         in = calloc(1, sizeof(*in));
  33         if (!in)
  34                 return;
  35
  36         instance_init(in, s, attr);
  37         vlist_add(&s->instances, &in->node, (void *) in->name);
  38 }
  39
  40 static void
  41 service_instance_update(struct vlist_tree *tree, struct vlist_node *node_new,
  42                         struct vlist_node *node_old)
  43 {
  44         struct service_instance *in_o = NULL, *in_n = NULL;
  45
  46         if (node_old)
  47                 in_o = container_of(node_old, struct service_instance, node);
  48
  49         if (node_new)
  50                 in_n = container_of(node_new, struct service_instance, node);
  51
  52         if (in_o && in_n) {
  53                 DEBUG(1, "Update instance %s::%s\n", in_o->srv->name, in_o->name);
  54                 instance_update(in_o, in_n);
  55                 instance_free(in_n);
  56         } else if (in_o) {
  57                 DEBUG(1, "Free instance %s::%s\n", in_o->srv->name, in_o->name);
  58                 instance_stop(in_o);
  59                 instance_free(in_o);
  60         } else if (in_n) {
  61                 DEBUG(1, "Create instance %s::%s\n", in_n->srv->name, in_n->name);
  62                 instance_start(in_n);
  63         }
  64 }
  65
  66 static struct service *
  67 service_alloc(const char *name)
  68 {
  69         struct service *s;
  70         char *new_name;
  71
  72         s = calloc_a(sizeof(*s), &new_name, strlen(name) + 1);
  73         strcpy(new_name, name);
  74
  75         vlist_init(&s->instances, avl_strcmp, service_instance_update);
  76         s->instances.keep_old = true;
  77         s->name = new_name;
  78         s->avl.key = s->name;
  79
  80         return s;
  81 }
  82
  83 enum {
  84         SERVICE_SET_NAME,
  85         SERVICE_SET_SCRIPT,
  86         SERVICE_SET_INSTANCES,
  87         SERVICE_SET_TRIGGER,
  88         __SERVICE_SET_MAX
  89 };
  90
  91 static const struct blobmsg_policy service_set_attrs[__SERVICE_SET_MAX] = {
  92         [SERVICE_SET_NAME] = { "name", BLOBMSG_TYPE_STRING },
  93         [SERVICE_SET_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
  94         [SERVICE_SET_INSTANCES] = { "instances", BLOBMSG_TYPE_TABLE },
  95         [SERVICE_SET_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  96 };
  97
  98 static int
  99 service_update(struct service *s, struct blob_attr *config, struct blob_attr **tb, bool add)
 100 {
 101         struct blob_attr *cur;
 102         int rem;
 103
 104         if (s->trigger) {
 105                 trigger_del(s);
 106                 free(s->trigger);
 107                 s->trigger = NULL;
 108         }
 109
 110         if (tb[SERVICE_SET_TRIGGER] && blobmsg_data_len(tb[SERVICE_SET_TRIGGER])) {
 111                 s->trigger = malloc(blob_pad_len(tb[SERVICE_SET_TRIGGER]));
 112                 if (!s->trigger)
 113                         return -1;
 114                 memcpy(s->trigger, tb[SERVICE_SET_TRIGGER], blob_pad_len(tb[SERVICE_SET_TRIGGER]));
 115                 trigger_add(s->trigger, s);
 116         }
 117
 118         if (tb[SERVICE_SET_INSTANCES]) {
 119                 if (!add)
 120                         vlist_update(&s->instances);
 121                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_INSTANCES], rem) {
 122                         service_instance_add(s, cur);
 123                 }
 124                 if (!add)
 125                         vlist_flush(&s->instances);
 126         }
 127
 128         return 0;
 129 }
 130
 131 static void
 132 service_delete(struct service *s)
 133 {
 134         vlist_flush_all(&s->instances);
 135         avl_delete(&services, &s->avl);
 136         trigger_del(s);
 137         s->trigger = NULL;
 138         free(s->trigger);
 139         free(s);
 140 }
 141
 142 enum {
 143         SERVICE_ATTR_NAME,
 144         __SERVICE_ATTR_MAX,
 145 };
 146
 147 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 148         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 149 };
 150
 151 enum {
 152         SERVICE_DEL_ATTR_NAME,
 153         SERVICE_DEL_ATTR_INSTANCE,
 154         __SERVICE_DEL_ATTR_MAX,
 155 };
 156
 157 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_ATTR_MAX] = {
 158         [SERVICE_DEL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 159         [SERVICE_DEL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 160 };
 161
 162 enum {
 163         SERVICE_LIST_ATTR_VERBOSE,
 164         __SERVICE_LIST_ATTR_MAX,
 165 };
 166
 167 static const struct blobmsg_policy service_list_attrs[__SERVICE_LIST_ATTR_MAX] = {
 168         [SERVICE_LIST_ATTR_VERBOSE] = { "verbose", BLOBMSG_TYPE_BOOL },
 169 };
 170
 171 enum {
 172         EVENT_TYPE,
 173         EVENT_DATA,
 174         __EVENT_MAX
 175 };
 176
 177 static const struct blobmsg_policy event_policy[__EVENT_MAX] = {
 178         [EVENT_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 179         [EVENT_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 180 };
 181
 182 static int
 183 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 184                    struct ubus_request_data *req, const char *method,
 185                    struct blob_attr *msg)
 186 {
 187         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 188         struct service *s = NULL;
 189         const char *name;
 190         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 191         bool add = !strcmp(method, "add");
 192
 193         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 194         cur = tb[SERVICE_ATTR_NAME];
 195         if (!cur)
 196                 goto free;
 197
 198         name = blobmsg_data(cur);
 199
 200         s = avl_find_element(&services, name, s, avl);
 201         if (s) {
 202                 DEBUG(1, "Update service %s\n", name);
 203                 return service_update(s, msg, tb, add);
 204         }
 205
 206         DEBUG(1, "Create service %s\n", name);
 207         s = service_alloc(name);
 208         if (!s)
 209                 return UBUS_STATUS_UNKNOWN_ERROR;
 210
 211         ret = service_update(s, msg, tb, add);
 212         if (ret)
 213                 goto free;
 214
 215         avl_insert(&services, &s->avl);
 216
 217         return 0;
 218
 219 free:
 220         free(msg);
 221         return ret;
 222 }
 223
 224 static void
 225 service_dump(struct service *s, int verbose)
 226 {
 227         struct service_instance *in;
 228         void *c, *i;
 229
 230         c = blobmsg_open_table(&b, s->name);
 231
 232         if (avl_is_empty(&s->instances.avl)) {
 233                 blobmsg_close_table(&b, c);
 234                 return;
 235         }
 236
 237         i = blobmsg_open_table(&b, "instances");
 238         vlist_for_each_element(&s->instances, in, node)
 239                 instance_dump(&b, in, verbose);
 240         blobmsg_close_table(&b, i);
 241         if (verbose && s->trigger)
 242                 blobmsg_add_blob(&b, s->trigger);
 243         blobmsg_close_table(&b, c);
 244 }
 245
 246 static int
 247 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 248                     struct ubus_request_data *req, const char *method,
 249                     struct blob_attr *msg)
 250 {
 251         struct blob_attr *tb[__SERVICE_LIST_ATTR_MAX];
 252         struct service *s;
 253         int verbose = 0;
 254
 255         blobmsg_parse(service_list_attrs, __SERVICE_LIST_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 256
 257         if (tb[SERVICE_LIST_ATTR_VERBOSE] && blobmsg_get_bool(tb[SERVICE_LIST_ATTR_VERBOSE]))
 258                 verbose = 1;
 259
 260         blob_buf_init(&b, 0);
 261         avl_for_each_element(&services, s, avl)
 262                 service_dump(s, verbose);
 263
 264         ubus_send_reply(ctx, req, b.head);
 265
 266         return 0;
 267 }
 268
 269 static int
 270 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 271                     struct ubus_request_data *req, const char *method,
 272                     struct blob_attr *msg)
 273 {
 274         struct blob_attr *tb[__SERVICE_DEL_ATTR_MAX], *cur;
 275         struct service *s;
 276         struct service_instance *in;
 277
 278         blobmsg_parse(service_del_attrs, __SERVICE_DEL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 279
 280         cur = tb[SERVICE_DEL_ATTR_NAME];
 281         if (!cur)
 282                 return UBUS_STATUS_NOT_FOUND;
 283
 284         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 285         if (!s)
 286                 return UBUS_STATUS_NOT_FOUND;
 287
 288         cur = tb[SERVICE_DEL_ATTR_INSTANCE];
 289         if (!cur) {
 290                 service_delete(s);
 291                 return 0;
 292         }
 293
 294         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 295         if (!in) {
 296                 ERROR("instance %s not found\n", (char *) blobmsg_data(cur));
 297                 return UBUS_STATUS_NOT_FOUND;
 298         }
 299
 300         vlist_delete(&s->instances, &in->node);
 301
 302         return 0;
 303 }
 304
 305 static int
 306 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 307                       struct ubus_request_data *req, const char *method,
 308                       struct blob_attr *msg)
 309 {
 310         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 311         struct service *s;
 312
 313         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 314
 315         cur = tb[SERVICE_ATTR_NAME];
 316         if (!cur)
 317                 return UBUS_STATUS_INVALID_ARGUMENT;
 318
 319         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 320         if (!s)
 321                 return UBUS_STATUS_NOT_FOUND;
 322
 323         if (!strcmp(method, "update_start"))
 324                 vlist_update(&s->instances);
 325         else
 326                 vlist_flush(&s->instances);
 327
 328         return 0;
 329 }
 330
 331 static int
 332 service_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 333                         struct ubus_request_data *req, const char *method,
 334                         struct blob_attr *msg)
 335 {
 336         struct blob_attr *tb[__EVENT_MAX];
 337
 338         if (!msg)
 339                 return UBUS_STATUS_INVALID_ARGUMENT;
 340
 341         blobmsg_parse(event_policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 342         if (!tb[EVENT_TYPE] || !tb[EVENT_DATA])
 343                 return UBUS_STATUS_INVALID_ARGUMENT;
 344
 345         trigger_event(blobmsg_get_string(tb[EVENT_TYPE]), tb[EVENT_DATA]);
 346
 347         return 0;
 348 }
 349
 350 static struct ubus_method main_object_methods[] = {
 351         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 352         UBUS_METHOD("add", service_handle_set, service_set_attrs),
 353         UBUS_METHOD("list", service_handle_list, service_attrs),
 354         UBUS_METHOD("delete", service_handle_delete, service_del_attrs),
 355         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 356         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 357         UBUS_METHOD("event", service_handle_event, event_policy),
 358 };
 359
 360 static struct ubus_object_type main_object_type =
 361         UBUS_OBJECT_TYPE("service", main_object_methods);
 362
 363 static struct ubus_object main_object = {
 364         .name = "service",
 365         .type = &main_object_type,
 366         .methods = main_object_methods,
 367         .n_methods = ARRAY_SIZE(main_object_methods),
 368 };
 369
 370 void ubus_init_service(struct ubus_context *ctx)
 371 {
 372         avl_init(&services, avl_strcmp, false, NULL);
 373         ubus_add_object(ctx, &main_object);
 374 }