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/avl-cmp.h>
  16 #include "procd.h"
  17 #include "service.h"
  18 #include "instance.h"
  19
  20 struct avl_tree services;
  21 static struct blob_buf b;
  22
  23 static void
  24 service_instance_add(struct service *s, struct blob_attr *attr)
  25 {
  26         struct service_instance *in;
  27
  28         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
  29                 return;
  30
  31         in = calloc(1, sizeof(*in));
  32         if (!in)
  33                 return;
  34
  35         instance_init(in, s, attr);
  36         vlist_add(&s->instances, &in->node, (void *) in->name);
  37 }
  38
  39 static void
  40 service_instance_update(struct vlist_tree *tree, struct vlist_node *node_new,
  41                         struct vlist_node *node_old)
  42 {
  43         struct service_instance *in_o = NULL, *in_n = NULL;
  44
  45         if (node_old)
  46                 in_o = container_of(node_old, struct service_instance, node);
  47
  48         if (node_new)
  49                 in_n = container_of(node_new, struct service_instance, node);
  50
  51         if (in_o && in_n) {
  52                 DEBUG(1, "Update instance %s::%s\n", in_o->srv->name, in_o->name);
  53                 instance_update(in_o, in_n);
  54                 instance_free(in_n);
  55         } else if (in_o) {
  56                 DEBUG(1, "Free instance %s::%s\n", in_o->srv->name, in_o->name);
  57                 instance_stop(in_o, false);
  58                 instance_free(in_o);
  59         } else if (in_n) {
  60                 DEBUG(1, "Create instance %s::%s\n", in_n->srv->name, in_n->name);
  61                 instance_start(in_n);
  62         }
  63 }
  64
  65 static struct service *
  66 service_alloc(const char *name)
  67 {
  68         struct service *s;
  69         char *new_name;
  70
  71         s = calloc_a(sizeof(*s), &new_name, strlen(name) + 1);
  72         strcpy(new_name, name);
  73
  74         vlist_init(&s->instances, avl_strcmp, service_instance_update);
  75         s->instances.keep_old = true;
  76         s->name = new_name;
  77         s->avl.key = s->name;
  78
  79         return s;
  80 }
  81
  82 enum {
  83         SERVICE_SET_NAME,
  84         SERVICE_SET_SCRIPT,
  85         SERVICE_SET_INSTANCES,
  86         SERVICE_SET_TRIGGER,
  87         __SERVICE_SET_MAX
  88 };
  89
  90 static const struct blobmsg_policy service_set_attrs[__SERVICE_SET_MAX] = {
  91         [SERVICE_SET_NAME] = { "name", BLOBMSG_TYPE_STRING },
  92         [SERVICE_SET_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
  93         [SERVICE_SET_INSTANCES] = { "instances", BLOBMSG_TYPE_TABLE },
  94         [SERVICE_SET_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  95 };
  96
  97 static int
  98 service_update(struct service *s, struct blob_attr *config, struct blob_attr **tb, bool add)
  99 {
 100         struct blob_attr *cur;
 101         int rem;
 102
 103         s->trigger = tb[SERVICE_SET_TRIGGER];
 104
 105         if (tb[SERVICE_SET_INSTANCES]) {
 106                 if (!add)
 107                         vlist_update(&s->instances);
 108                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_INSTANCES], rem) {
 109                         service_instance_add(s, cur);
 110                 }
 111                 if (!add)
 112                         vlist_flush(&s->instances);
 113         }
 114
 115         return 0;
 116 }
 117
 118 static void
 119 service_delete(struct service *s)
 120 {
 121         vlist_flush_all(&s->instances);
 122         avl_delete(&services, &s->avl);
 123         free(s->config);
 124         free(s);
 125 }
 126
 127 enum {
 128         SERVICE_ATTR_NAME,
 129         __SERVICE_ATTR_MAX,
 130 };
 131
 132 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 133         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 134 };
 135
 136 enum {
 137         SERVICE_DEL_ATTR_NAME,
 138         SERVICE_DEL_ATTR_INSTANCE,
 139         __SERVICE_DEL_ATTR_MAX,
 140 };
 141
 142 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_ATTR_MAX] = {
 143         [SERVICE_DEL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 144         [SERVICE_DEL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 145 };
 146
 147 enum {
 148         SERVICE_LIST_ATTR_VERBOSE,
 149         __SERVICE_LIST_ATTR_MAX,
 150 };
 151
 152 static const struct blobmsg_policy service_list_attrs[__SERVICE_LIST_ATTR_MAX] = {
 153         [SERVICE_LIST_ATTR_VERBOSE] = { "verbose", BLOBMSG_TYPE_INT32 },
 154 };
 155
 156 enum {
 157         EVENT_TYPE,
 158         EVENT_DATA,
 159         __EVENT_MAX
 160 };
 161
 162 static const struct blobmsg_policy event_policy[__EVENT_MAX] = {
 163         [EVENT_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 164         [EVENT_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 165 };
 166
 167 static int
 168 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 169                    struct ubus_request_data *req, const char *method,
 170                    struct blob_attr *msg)
 171 {
 172         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 173         struct service *s = NULL;
 174         const char *name;
 175         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 176         bool add = !strcmp(method, "add");
 177
 178         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 179         cur = tb[SERVICE_ATTR_NAME];
 180         if (!cur)
 181                 goto free;
 182
 183         name = blobmsg_data(cur);
 184
 185         s = avl_find_element(&services, name, s, avl);
 186         if (s) {
 187                 DEBUG(1, "Update service %s\n", name);
 188                 return service_update(s, msg, tb, add);
 189         }
 190
 191         DEBUG(1, "Create service %s\n", name);
 192         s = service_alloc(name);
 193         if (!s)
 194                 return UBUS_STATUS_UNKNOWN_ERROR;
 195
 196         ret = service_update(s, msg, tb, add);
 197         if (ret)
 198                 goto free;
 199
 200         avl_insert(&services, &s->avl);
 201
 202         return 0;
 203
 204 free:
 205         free(msg);
 206         return ret;
 207 }
 208
 209 static void
 210 service_dump(struct service *s, int verbose)
 211 {
 212         struct service_instance *in;
 213         void *c, *i;
 214
 215         if (avl_is_empty(&s->instances.avl))
 216                 return;
 217
 218         c = blobmsg_open_table(&b, s->name);
 219         i = blobmsg_open_table(&b, "instances");
 220         if (verbose && s->trigger)
 221                 blobmsg_add_blob(&b, s->trigger);
 222         vlist_for_each_element(&s->instances, in, node)
 223                 instance_dump(&b, in, verbose);
 224         blobmsg_close_table(&b, i);
 225         blobmsg_close_table(&b, c);
 226 }
 227
 228 static int
 229 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 230                     struct ubus_request_data *req, const char *method,
 231                     struct blob_attr *msg)
 232 {
 233         struct blob_attr *tb[__SERVICE_LIST_ATTR_MAX];
 234         struct service *s;
 235         int verbose = 0;
 236
 237         blobmsg_parse(service_list_attrs, __SERVICE_LIST_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 238
 239         if (tb[SERVICE_LIST_ATTR_VERBOSE] && blobmsg_get_u32(tb[SERVICE_LIST_ATTR_VERBOSE]))
 240                 verbose = 1;
 241
 242         blob_buf_init(&b, 0);
 243         avl_for_each_element(&services, s, avl)
 244                 service_dump(s, verbose);
 245
 246         ubus_send_reply(ctx, req, b.head);
 247
 248         return 0;
 249 }
 250
 251 static int
 252 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 253                     struct ubus_request_data *req, const char *method,
 254                     struct blob_attr *msg)
 255 {
 256         struct blob_attr *tb[__SERVICE_DEL_ATTR_MAX], *cur;
 257         struct service *s;
 258         struct service_instance *in;
 259
 260         blobmsg_parse(service_del_attrs, __SERVICE_DEL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 261
 262         cur = tb[SERVICE_DEL_ATTR_NAME];
 263         if (!cur)
 264                 return UBUS_STATUS_NOT_FOUND;
 265
 266         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 267         if (!s)
 268                 return UBUS_STATUS_NOT_FOUND;
 269
 270         cur = tb[SERVICE_DEL_ATTR_INSTANCE];
 271         if (!cur) {
 272                 service_delete(s);
 273                 return 0;
 274         }
 275
 276         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 277         if (!in) {
 278                 ERROR("instance %s not found\n", (char *) blobmsg_data(cur));
 279                 return UBUS_STATUS_NOT_FOUND;
 280         }
 281
 282         vlist_delete(&s->instances, &in->node);
 283
 284         return 0;
 285 }
 286
 287 static int
 288 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 289                       struct ubus_request_data *req, const char *method,
 290                       struct blob_attr *msg)
 291 {
 292         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 293         struct service *s;
 294
 295         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 296
 297         cur = tb[SERVICE_ATTR_NAME];
 298         if (!cur)
 299                 return UBUS_STATUS_INVALID_ARGUMENT;
 300
 301         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 302         if (!s)
 303                 return UBUS_STATUS_NOT_FOUND;
 304
 305         if (!strcmp(method, "update_start"))
 306                 vlist_update(&s->instances);
 307         else
 308                 vlist_flush(&s->instances);
 309
 310         return 0;
 311 }
 312
 313 static int
 314 service_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 315                         struct ubus_request_data *req, const char *method,
 316                         struct blob_attr *msg)
 317 {
 318         struct blob_attr *tb[__EVENT_MAX];
 319
 320         if (!msg)
 321                 return UBUS_STATUS_INVALID_ARGUMENT;
 322
 323         blobmsg_parse(event_policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 324         if (!tb[EVENT_TYPE] || !tb[EVENT_DATA])
 325                 return UBUS_STATUS_INVALID_ARGUMENT;
 326
 327         trigger_event(blobmsg_get_string(tb[EVENT_TYPE]), tb[EVENT_DATA]);
 328
 329         return 0;
 330 }
 331
 332 static struct ubus_method main_object_methods[] = {
 333         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 334         UBUS_METHOD("add", service_handle_set, service_set_attrs),
 335         UBUS_METHOD("list", service_handle_list, service_attrs),
 336         UBUS_METHOD("delete", service_handle_delete, service_del_attrs),
 337         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 338         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 339         UBUS_METHOD("event", service_handle_event, event_policy),
 340 };
 341
 342 static struct ubus_object_type main_object_type =
 343         UBUS_OBJECT_TYPE("service", main_object_methods);
 344
 345 static struct ubus_object main_object = {
 346         .name = "service",
 347         .type = &main_object_type,
 348         .methods = main_object_methods,
 349         .n_methods = ARRAY_SIZE(main_object_methods),
 350 };
 351
 352 void ubus_init_service(struct ubus_context *ctx)
 353 {
 354         avl_init(&services, avl_strcmp, false, NULL);
 355         ubus_add_object(ctx, &main_object);
 356 }