libubus.h

   1 #include <libubox/avl.h>
   2 #include <libubox/list.h>
   3 #include <libubox/blobmsg.h>
   4 #include <libubox/uloop.h>
   5 #include <stdint.h>
   6 #include "ubusmsg.h"
   7 #include "ubus_common.h"
   8
   9 struct ubus_msg_src;
  10 struct ubus_object;
  11 struct ubus_request;
  12 struct ubus_request_data;
  13
  14 typedef int (*ubus_handler_t)(struct ubus_object *obj,
  15                               struct ubus_request_data *req,
  16                               const char *method, struct blob_attr *msg);
  17 typedef void (*ubus_data_handler_t)(struct ubus_request *req,
  18                                     int type, struct blob_attr *msg);
  19 typedef void (*ubus_complete_handler_t)(struct ubus_request *req, int ret);
  20
  21
  22 #define UBUS_SIGNATURE(_type, _name)    { .type = _type, .name = _name }
  23
  24 #define UBUS_METHOD_START(_name)                UBUS_SIGNATURE(UBUS_SIGNATURE_METHOD, _name)
  25 #define UBUS_METHOD_END()                       UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  26
  27 #define UBUS_FIELD(_type, _name)                UBUS_SIGNATURE(BLOBMSG_TYPE_ ## _type, _name)
  28
  29 #define UBUS_ARRAY(_name)                       UBUS_FIELD(ARRAY, _name)
  30 #define UBUS_ARRAY_END()                        UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  31
  32 #define UBUS_TABLE_START(_name)                 UBUS_FIELD(TABLE, _name)
  33 #define UBUS_TABLE_END()                        UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  34
  35 #define UBUS_OBJECT_TYPE(_name, _signature)             \
  36         {                                               \
  37                 .name = _name,                          \
  38                 .id = 0,                                \
  39                 .n_signature = ARRAY_SIZE(_signature),  \
  40                 .signature = _signature                 \
  41         }
  42
  43 struct ubus_signature {
  44         enum blobmsg_type type;
  45         const char *name;
  46 };
  47
  48 struct ubus_object_type {
  49         const char *name;
  50         uint32_t id;
  51         int n_signature;
  52         const struct ubus_signature *signature;
  53 };
  54
  55 struct ubus_method {
  56         const char *name;
  57         ubus_handler_t handler;
  58 };
  59
  60 struct ubus_object {
  61         struct avl_node avl;
  62
  63         const char *name;
  64         uint32_t id;
  65
  66         const char *path;
  67         struct ubus_object_type *type;
  68
  69         const struct ubus_method *methods;
  70         int n_methods;
  71 };
  72
  73 struct ubus_context {
  74         struct list_head requests;
  75         struct avl_tree objects;
  76
  77         struct uloop_fd sock;
  78
  79         uint32_t local_id;
  80         uint32_t request_seq;
  81
  82         struct {
  83                 struct ubus_msghdr hdr;
  84                 char data[UBUS_MAX_MSGLEN - sizeof(struct ubus_msghdr)];
  85         } msgbuf;
  86 };
  87
  88 struct ubus_request_data {
  89         uint32_t object;
  90         uint32_t peer;
  91         uint32_t seq;
  92 };
  93
  94 struct ubus_request {
  95         struct list_head list;
  96
  97         struct list_head pending;
  98         bool status_msg;
  99         int status_code;
 100         bool blocked;
 101         bool cancelled;
 102
 103         uint32_t peer;
 104         uint32_t seq;
 105
 106         ubus_data_handler_t data_cb;
 107         ubus_complete_handler_t complete_cb;
 108
 109         struct ubus_context *ctx;
 110         void *priv;
 111 };
 112
 113 #define BLOBMSG_END_TABLE       BLOBMSG_TYPE_UNSPEC
 114
 115 struct ubus_context *ubus_connect(const char *path);
 116 void ubus_free(struct ubus_context *ctx);
 117
 118 const char *ubus_strerror(int error);
 119
 120 /* ----------- helpers for message handling ----------- */
 121
 122 struct blob_attr **ubus_parse_msg(struct blob_attr *msg);
 123
 124 /* ----------- raw request handling ----------- */
 125
 126 /* start a raw request */
 127 int ubus_start_request(struct ubus_context *ctx, struct ubus_request *req,
 128                        struct blob_attr *msg, int cmd, uint32_t peer);
 129
 130 /* wait for a request to complete and return its status */
 131 int ubus_complete_request(struct ubus_context *ctx, struct ubus_request *req);
 132
 133 /* complete a request asynchronously */
 134 void ubus_complete_request_async(struct ubus_context *ctx,
 135                                  struct ubus_request *req);
 136
 137 /* abort an asynchronous request */
 138 void ubus_abort_request(struct ubus_context *ctx, struct ubus_request *req);
 139
 140 /* ----------- rpc ----------- */
 141
 142 /* invoke a method on a specific object */
 143 int ubus_invoke(struct ubus_context *ctx, uint32_t obj, const char *method,
 144                 struct blob_attr *msg, ubus_data_handler_t cb, void *priv);
 145
 146 /* asynchronous version of ubus_invoke() */
 147 void ubus_invoke_async(struct ubus_context *ctx, uint32_t obj, const char *method,
 148                        struct blob_attr *msg, struct ubus_request *req);
 149
 150 /* make an object visible to remote connections */
 151 int ubus_publish(struct ubus_context *ctx, struct ubus_object *obj);
 152
 153