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_MAX
  87 };
  88
  89 static const struct blobmsg_policy service_set_attrs[__SERVICE_SET_MAX] = {
  90         [SERVICE_SET_NAME] = { "name", BLOBMSG_TYPE_STRING },
  91         [SERVICE_SET_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
  92         [SERVICE_SET_INSTANCES] = { "instances", BLOBMSG_TYPE_TABLE },
  93 };
  94
  95
  96 static int
  97 service_update(struct service *s, struct blob_attr *config, struct blob_attr **tb, bool add)
  98 {
  99         struct blob_attr *cur;
 100         int rem;
 101
 102         if (tb[SERVICE_SET_INSTANCES]) {
 103                 if (!add)
 104                         vlist_update(&s->instances);
 105                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_INSTANCES], rem) {
 106                         service_instance_add(s, cur);
 107                 }
 108                 if (!add)
 109                         vlist_flush(&s->instances);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static void
 116 service_delete(struct service *s)
 117 {
 118         vlist_flush_all(&s->instances);
 119         avl_delete(&services, &s->avl);
 120         free(s->config);
 121         free(s);
 122 }
 123
 124 enum {
 125         SERVICE_ATTR_NAME,
 126         __SERVICE_ATTR_MAX,
 127 };
 128
 129 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 130         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 131 };
 132
 133 enum {
 134         SERVICE_DEL_ATTR_NAME,
 135         SERVICE_DEL_ATTR_INSTANCE,
 136         __SERVICE_DEL_ATTR_MAX,
 137 };
 138
 139 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_ATTR_MAX] = {
 140         [SERVICE_DEL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 141         [SERVICE_DEL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 142 };
 143
 144
 145 static int
 146 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 147                    struct ubus_request_data *req, const char *method,
 148                    struct blob_attr *msg)
 149 {
 150         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 151         struct service *s = NULL;
 152         const char *name;
 153         int ret = UBUS_STATUS_INVALID_ARGUMENT;
 154         bool add = !strcmp(method, "add");
 155
 156         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 157         cur = tb[SERVICE_ATTR_NAME];
 158         if (!cur)
 159                 goto free;
 160
 161         name = blobmsg_data(cur);
 162
 163         s = avl_find_element(&services, name, s, avl);
 164         if (s) {
 165                 DEBUG(1, "Update service %s\n", name);
 166                 return service_update(s, msg, tb, add);
 167         }
 168
 169         DEBUG(1, "Create service %s\n", name);
 170         s = service_alloc(name);
 171         if (!s)
 172                 return UBUS_STATUS_UNKNOWN_ERROR;
 173
 174         ret = service_update(s, msg, tb, add);
 175         if (ret)
 176                 goto free;
 177
 178         avl_insert(&services, &s->avl);
 179
 180         return 0;
 181
 182 free:
 183         free(msg);
 184         return ret;
 185 }
 186
 187 static void
 188 service_dump(struct service *s)
 189 {
 190         struct service_instance *in;
 191         void *c, *i;
 192
 193         c = blobmsg_open_table(&b, s->name);
 194         i = blobmsg_open_table(&b, "instances");
 195         vlist_for_each_element(&s->instances, in, node)
 196                 instance_dump(&b, in);
 197         blobmsg_close_table(&b, i);
 198         blobmsg_close_table(&b, c);
 199 }
 200
 201 static int
 202 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 203                     struct ubus_request_data *req, const char *method,
 204                     struct blob_attr *msg)
 205 {
 206         struct service *s;
 207
 208         blob_buf_init(&b, 0);
 209         avl_for_each_element(&services, s, avl)
 210                 service_dump(s);
 211
 212         ubus_send_reply(ctx, req, b.head);
 213
 214         return 0;
 215 }
 216
 217 static int
 218 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 219                     struct ubus_request_data *req, const char *method,
 220                     struct blob_attr *msg)
 221 {
 222         struct blob_attr *tb[__SERVICE_DEL_ATTR_MAX], *cur;
 223         struct service *s, *tmp;
 224         struct service_instance *in;
 225
 226         blobmsg_parse(service_del_attrs, __SERVICE_DEL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 227
 228         cur = tb[SERVICE_DEL_ATTR_NAME];
 229         if (!cur) {
 230                 avl_for_each_element_safe(&services, s, avl, tmp)
 231                         service_delete(s);
 232                 return 0;
 233         }
 234
 235         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 236         if (!s)
 237                 return UBUS_STATUS_NOT_FOUND;
 238
 239         cur = tb[SERVICE_DEL_ATTR_INSTANCE];
 240         if (!cur) {
 241                 service_delete(s);
 242                 return 0;
 243         }
 244
 245         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 246         if (!in) {
 247                 ERROR("instance %s not found\n", (char *) blobmsg_data(cur));
 248                 return UBUS_STATUS_NOT_FOUND;
 249         }
 250
 251         vlist_delete(&s->instances, &in->node);
 252
 253         return 0;
 254 }
 255
 256 static int
 257 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 258                       struct ubus_request_data *req, const char *method,
 259                       struct blob_attr *msg)
 260 {
 261         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 262         struct service *s;
 263
 264         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 265
 266         cur = tb[SERVICE_ATTR_NAME];
 267         if (!cur)
 268                 return UBUS_STATUS_INVALID_ARGUMENT;
 269
 270         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 271         if (!s)
 272                 return UBUS_STATUS_NOT_FOUND;
 273
 274         if (!strcmp(method, "update_start"))
 275                 vlist_update(&s->instances);
 276         else
 277                 vlist_flush(&s->instances);
 278
 279         return 0;
 280 }
 281
 282 static struct ubus_method main_object_methods[] = {
 283         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 284         UBUS_METHOD("add", service_handle_set, service_set_attrs),
 285         UBUS_METHOD("list", service_handle_list, service_attrs),
 286         UBUS_METHOD("delete", service_handle_delete, service_del_attrs),
 287         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 288         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 289 };
 290
 291 static struct ubus_object_type main_object_type =
 292         UBUS_OBJECT_TYPE("service", main_object_methods);
 293
 294 static struct ubus_object main_object = {
 295         .name = "service",
 296         .type = &main_object_type,
 297         .methods = main_object_methods,
 298         .n_methods = ARRAY_SIZE(main_object_methods),
 299 };
 300
 301 void ubus_init_service(struct ubus_context *ctx)
 302 {
 303         avl_init(&services, avl_strcmp, false, NULL);
 304         ubus_add_object(ctx, &main_object);
 305 }