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_context;
  10 struct ubus_msg_src;
  11 struct ubus_object;
  12 struct ubus_request;
  13 struct ubus_request_data;
  14 struct ubus_object_data;
  15
  16 typedef void (*ubus_lookup_handler_t)(struct ubus_context *ctx,
  17                                       struct ubus_object_data *obj,
  18                                       void *priv);
  19 typedef int (*ubus_handler_t)(struct ubus_context *ctx, struct ubus_object *obj,
  20                               struct ubus_request_data *req,
  21                               const char *method, struct blob_attr *msg);
  22 typedef void (*ubus_data_handler_t)(struct ubus_request *req,
  23                                     int type, struct blob_attr *msg);
  24 typedef void (*ubus_complete_handler_t)(struct ubus_request *req, int ret);
  25
  26
  27 #define UBUS_SIGNATURE(_type, _name)    { .type = _type, .name = _name }
  28
  29 #define UBUS_METHOD_START(_name)                UBUS_SIGNATURE(UBUS_SIGNATURE_METHOD, _name)
  30 #define UBUS_METHOD_END()                       UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  31
  32 #define UBUS_FIELD(_type, _name)                UBUS_SIGNATURE(BLOBMSG_TYPE_ ## _type, _name)
  33
  34 #define UBUS_ARRAY(_name)                       UBUS_FIELD(ARRAY, _name)
  35 #define UBUS_ARRAY_END()                        UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  36
  37 #define UBUS_TABLE_START(_name)                 UBUS_FIELD(TABLE, _name)
  38 #define UBUS_TABLE_END()                        UBUS_SIGNATURE(UBUS_SIGNATURE_END, NULL)
  39
  40 #define UBUS_OBJECT_TYPE(_name, _signature)             \
  41         {                                               \
  42                 .name = _name,                          \
  43                 .id = 0,                                \
  44                 .n_signature = ARRAY_SIZE(_signature),  \
  45                 .signature = _signature                 \
  46         }
  47
  48 struct ubus_signature {
  49         enum blobmsg_type type;
  50         const char *name;
  51 };
  52
  53 struct ubus_object_type {
  54         const char *name;
  55         uint32_t id;
  56         int n_signature;
  57         const struct ubus_signature *signature;
  58 };
  59
  60 struct ubus_method {
  61         const char *name;
  62         ubus_handler_t handler;
  63 };
  64
  65 struct ubus_object {
  66         struct avl_node avl;
  67
  68         const char *name;
  69         uint32_t id;
  70
  71         const char *path;
  72         struct ubus_object_type *type;
  73
  74         const struct ubus_method *methods;
  75         int n_methods;
  76 };
  77
  78 struct ubus_context {
  79         struct list_head requests;
  80         struct avl_tree objects;
  81
  82         struct uloop_fd sock;
  83
  84         uint32_t local_id;
  85         uint32_t request_seq;
  86
  87         void (*connection_lost)(struct ubus_context *ctx);
  88
  89         struct {
  90                 struct ubus_msghdr hdr;
  91                 char data[UBUS_MAX_MSGLEN - sizeof(struct ubus_msghdr)];
  92         } msgbuf;
  93 };
  94
  95 struct ubus_object_data {
  96         uint32_t id;
  97         uint32_t type_id;
  98         const char *path;
  99         struct blob_attr *signature;
 100 };
 101
 102 struct ubus_request_data {
 103         uint32_t object;
 104         uint32_t peer;
 105         uint32_t seq;
 106 };
 107
 108 struct ubus_request {
 109         struct list_head list;
 110
 111         struct list_head pending;
 112         bool status_msg;
 113         int status_code;
 114         bool blocked;
 115         bool cancelled;
 116
 117         uint32_t peer;
 118         uint32_t seq;
 119
 120         ubus_data_handler_t raw_data_cb;
 121         ubus_data_handler_t data_cb;
 122         ubus_complete_handler_t complete_cb;
 123
 124         struct ubus_context *ctx;
 125         void *priv;
 126 };
 127
 128
 129 struct ubus_context *ubus_connect(const char *path);
 130 void ubus_free(struct ubus_context *ctx);
 131
 132 const char *ubus_strerror(int error);
 133
 134 static inline void ubus_add_uloop(struct ubus_context *ctx)
 135 {
 136         uloop_fd_add(&ctx->sock, ULOOP_EDGE_TRIGGER | ULOOP_BLOCKING | ULOOP_READ);
 137 }
 138
 139 /* ----------- raw request handling ----------- */
 140
 141 /* wait for a request to complete and return its status */
 142 int ubus_complete_request(struct ubus_context *ctx, struct ubus_request *req);
 143
 144 /* complete a request asynchronously */
 145 void ubus_complete_request_async(struct ubus_context *ctx,
 146                                  struct ubus_request *req);
 147
 148 /* abort an asynchronous request */
 149 void ubus_abort_request(struct ubus_context *ctx, struct ubus_request *req);
 150
 151 /* ----------- objects ----------- */
 152
 153 int ubus_lookup(struct ubus_context *ctx, const char *path,
 154                 ubus_lookup_handler_t cb, void *priv);
 155
 156 int ubus_lookup_id(struct ubus_context *ctx, const char *path, uint32_t *id);
 157
 158 /* ----------- rpc ----------- */
 159
 160 /* invoke a method on a specific object */
 161 int ubus_invoke(struct ubus_context *ctx, uint32_t obj, const char *method,
 162                 struct blob_attr *msg, ubus_data_handler_t cb, void *priv);
 163
 164 /* asynchronous version of ubus_invoke() */
 165 void ubus_invoke_async(struct ubus_context *ctx, uint32_t obj, const char *method,
 166                        struct blob_attr *msg, struct ubus_request *req);
 167
 168 /* make an object visible to remote connections */
 169 int ubus_publish(struct ubus_context *ctx, struct ubus_object *obj);
 170
 171 /* send a reply to an incoming object method call */
 172 int ubus_send_reply(struct ubus_context *ctx, struct ubus_request_data *req,
 173                     struct blob_attr *msg);
 174
 175 /* ----------- events ----------- */
 176 int ubus_register_event_handler(struct ubus_context *ctx, struct ubus_object *obj,
 177                                 const char *pattern);