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, false);
  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
 107         if (tb[SERVICE_SET_TRIGGER] && blobmsg_data_len(tb[SERVICE_SET_TRIGGER])) {
 108                 s->trigger = tb[SERVICE_SET_TRIGGER];
 109                 trigger_add(s->trigger, s);
 110         }
 111
 112         if (tb[SERVICE_SET_INSTANCES]) {
 113                 if (!add)
 114                         vlist_update(&s->instances);
 115                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_INSTANCES], rem) {
 116                         service_instance_add(s, cur);
 117                 }
 118                 if (!add)
 119                         vlist_flush(&s->instances);
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void
 126 service_delete(struct service *s)
 127 {
 128         vlist_flush_all(&s->instances);
 129         avl_delete(&services, &s->avl);
 130         trigger_del(s);
 131         free(s->config);
 132         free(s);
 133 }
 134
 135 enum {
 136         SERVICE_ATTR_NAME,
 137         __SERVICE_ATTR_MAX,
 138 };
 139
 140 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 141         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 142 };
 143
 144 enum {
 145         SERVICE_DEL_ATTR_NAME,
 146         SERVICE_DEL_ATTR_INSTANCE,
 147         __SERVICE_DEL_ATTR_MAX,
 148 };
 149
 150 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_ATTR_MAX] = {
 151         [SERVICE_DEL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 152         [SERVICE_DEL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 153 };
 154
 155 enum {
 156         SERVICE_LIST_ATTR_VERBOSE,
 157         __SERVICE_LIST_ATTR_MAX,
 158 };
 159
 160 static const struct blobmsg_policy service_list_attrs[__SERVICE_LIST_ATTR_MAX] = {
 161         [SERVICE_LIST_ATTR_VERBOSE] = { "verbose", BLOBMSG_TYPE_BOOL },
 162 };
 163
 164 enum {
 165         EVENT_TYPE,
 166         EVENT_DATA,
 167         __EVENT_MAX
 168 };
 169
 170 static const struct blobmsg_policy event_policy[__EVENT_MAX] = {
 171         [EVENT_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 172         [EVENT_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 173 };
 174
 175 static int
 176 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 177                    struct ubus_request_data *req, const char *method,
 178                    struct blob_attr *msg)
 179 {
 180         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 181         struct service *s = NULL;
 182         const char *name;
 183         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 184         bool add = !strcmp(method, "add");
 185
 186         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 187         cur = tb[SERVICE_ATTR_NAME];
 188         if (!cur)
 189                 goto free;
 190
 191         name = blobmsg_data(cur);
 192
 193         s = avl_find_element(&services, name, s, avl);
 194         if (s) {
 195                 DEBUG(1, "Update service %s\n", name);
 196                 return service_update(s, msg, tb, add);
 197         }
 198
 199         DEBUG(1, "Create service %s\n", name);
 200         s = service_alloc(name);
 201         if (!s)
 202                 return UBUS_STATUS_UNKNOWN_ERROR;
 203
 204         ret = service_update(s, msg, tb, add);
 205         if (ret)
 206                 goto free;
 207
 208         avl_insert(&services, &s->avl);
 209
 210         return 0;
 211
 212 free:
 213         free(msg);
 214         return ret;
 215 }
 216
 217 static void
 218 service_dump(struct service *s, int verbose)
 219 {
 220         struct service_instance *in;
 221         void *c, *i;
 222
 223         if (avl_is_empty(&s->instances.avl))
 224                 return;
 225
 226         c = blobmsg_open_table(&b, s->name);
 227         if (verbose && s->trigger)
 228                 blobmsg_add_blob(&b, s->trigger);
 229         i = blobmsg_open_table(&b, "instances");
 230         vlist_for_each_element(&s->instances, in, node)
 231                 instance_dump(&b, in, verbose);
 232         blobmsg_close_table(&b, i);
 233         blobmsg_close_table(&b, c);
 234 }
 235
 236 static int
 237 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 238                     struct ubus_request_data *req, const char *method,
 239                     struct blob_attr *msg)
 240 {
 241         struct blob_attr *tb[__SERVICE_LIST_ATTR_MAX];
 242         struct service *s;
 243         int verbose = 0;
 244
 245         blobmsg_parse(service_list_attrs, __SERVICE_LIST_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 246
 247         if (tb[SERVICE_LIST_ATTR_VERBOSE] && blobmsg_get_bool(tb[SERVICE_LIST_ATTR_VERBOSE]))
 248                 verbose = 1;
 249
 250         blob_buf_init(&b, 0);
 251         avl_for_each_element(&services, s, avl)
 252                 service_dump(s, verbose);
 253
 254         ubus_send_reply(ctx, req, b.head);
 255
 256         return 0;
 257 }
 258
 259 static int
 260 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 261                     struct ubus_request_data *req, const char *method,
 262                     struct blob_attr *msg)
 263 {
 264         struct blob_attr *tb[__SERVICE_DEL_ATTR_MAX], *cur;
 265         struct service *s;
 266         struct service_instance *in;
 267
 268         blobmsg_parse(service_del_attrs, __SERVICE_DEL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 269
 270         cur = tb[SERVICE_DEL_ATTR_NAME];
 271         if (!cur)
 272                 return UBUS_STATUS_NOT_FOUND;
 273
 274         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 275         if (!s)
 276                 return UBUS_STATUS_NOT_FOUND;
 277
 278         cur = tb[SERVICE_DEL_ATTR_INSTANCE];
 279         if (!cur) {
 280                 service_delete(s);
 281                 return 0;
 282         }
 283
 284         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 285         if (!in) {
 286                 ERROR("instance %s not found\n", (char *) blobmsg_data(cur));
 287                 return UBUS_STATUS_NOT_FOUND;
 288         }
 289
 290         vlist_delete(&s->instances, &in->node);
 291
 292         return 0;
 293 }
 294
 295 static int
 296 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 297                       struct ubus_request_data *req, const char *method,
 298                       struct blob_attr *msg)
 299 {
 300         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 301         struct service *s;
 302
 303         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 304
 305         cur = tb[SERVICE_ATTR_NAME];
 306         if (!cur)
 307                 return UBUS_STATUS_INVALID_ARGUMENT;
 308
 309         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 310         if (!s)
 311                 return UBUS_STATUS_NOT_FOUND;
 312
 313         if (!strcmp(method, "update_start"))
 314                 vlist_update(&s->instances);
 315         else
 316                 vlist_flush(&s->instances);
 317
 318         return 0;
 319 }
 320
 321 static int
 322 service_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 323                         struct ubus_request_data *req, const char *method,
 324                         struct blob_attr *msg)
 325 {
 326         struct blob_attr *tb[__EVENT_MAX];
 327
 328         if (!msg)
 329                 return UBUS_STATUS_INVALID_ARGUMENT;
 330
 331         blobmsg_parse(event_policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 332         if (!tb[EVENT_TYPE] || !tb[EVENT_DATA])
 333                 return UBUS_STATUS_INVALID_ARGUMENT;
 334
 335         trigger_event(blobmsg_get_string(tb[EVENT_TYPE]), tb[EVENT_DATA]);
 336
 337         return 0;
 338 }
 339
 340 static struct ubus_method main_object_methods[] = {
 341         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 342         UBUS_METHOD("add", service_handle_set, service_set_attrs),
 343         UBUS_METHOD("list", service_handle_list, service_attrs),
 344         UBUS_METHOD("delete", service_handle_delete, service_del_attrs),
 345         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 346         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 347         UBUS_METHOD("event", service_handle_event, event_policy),
 348 };
 349
 350 static struct ubus_object_type main_object_type =
 351         UBUS_OBJECT_TYPE("service", main_object_methods);
 352
 353 static struct ubus_object main_object = {
 354         .name = "service",
 355         .type = &main_object_type,
 356         .methods = main_object_methods,
 357         .n_methods = ARRAY_SIZE(main_object_methods),
 358 };
 359
 360 void ubus_init_service(struct ubus_context *ctx)
 361 {
 362         avl_init(&services, avl_strcmp, false, NULL);
 363         ubus_add_object(ctx, &main_object);
 364 }