golioth_rpc

Typedefs
typedef enum golioth_rpc_status(*	golioth_rpc_cb_fn) (zcbor_state_t *request_params_array, zcbor_state_t *response_detail_map, void *callback_arg)

Enumerations
enum	golioth_rpc_status {   GOLIOTH_RPC_OK = 0 , GOLIOTH_RPC_CANCELED = 1 , GOLIOTH_RPC_UNKNOWN = 2 , GOLIOTH_RPC_INVALID_ARGUMENT = 3 ,   GOLIOTH_RPC_DEADLINE_EXCEEDED = 4 , GOLIOTH_RPC_NOT_FOUND = 5 , GOLIOTH_RPC_ALREADYEXISTS = 6 , GOLIOTH_RPC_PERMISSION_DENIED = 7 ,   GOLIOTH_RPC_RESOURCE_EXHAUSTED = 8 , GOLIOTH_RPC_FAILED_PRECONDITION = 9 , GOLIOTH_RPC_ABORTED = 10 , GOLIOTH_RPC_OUT_OF_RANGE = 11 ,   GOLIOTH_RPC_UNIMPLEMENTED = 12 , GOLIOTH_RPC_INTERNAL = 13 , GOLIOTH_RPC_UNAVAILABLE = 14 , GOLIOTH_RPC_DATA_LOSS = 15 ,   GOLIOTH_RPC_UNAUTHENTICATED = 16 }
	Enumeration of RPC status codes, sent in the RPC response. More...

Functions
struct golioth_rpc *	golioth_rpc_init (struct golioth_client *client)
enum golioth_status	golioth_rpc_register (struct golioth_rpc *grpc, const char *method, golioth_rpc_cb_fn callback, void *callback_arg)

Detailed Description

Functions for interacting with the Golioth Remote Procedure Call service

Typedef Documentation

golioth_rpc_cb_fn

typedef enum golioth_rpc_status(* golioth_rpc_cb_fn) (zcbor_state_t *request_params_array, zcbor_state_t *response_detail_map, void *callback_arg)

Callback function type for remote procedure call

Example of a callback function that implements the "multiply" method, which takes two float parameters, and multiplies them:

static enum golioth_rpc_status on_multiply(zcbor_state_t *request_params_array,
                                        zcbor_state_t *response_detail_map,
                                        void *callback_arg)
{
     double a, b;
     double value;
     bool ok;
 
     ok = zcbor_float_decode(request_params_array, &a) &&
          zcbor_float_decode(request_params_array, &b);
     if (!ok) {
           GLTH_LOGE(TAG, "Failed to decode array items");
           return GOLIOTH_RPC_INVALID_ARGUMENT;
     }
 
     value = a * b;
 
     ok = zcbor_tstr_put_lit(response_detail_map, "value") &&
          zcbor_float64_put(response_detail_map, value);
     if (!ok) {
           GLTH_LOGE(TAG, "Failed to encode value");
           return GOLIOTH_RPC_RESOURCE_EXHAUSTED;
     }
 
     return GOLIOTH_RPC_OK;
}

Parameters

request_params_array	zcbor decode state, inside of the RPC request params array
response_detail_map	zcbor encode state, inside of the RPC response detail map
callback_arg	callback_arg, unchanged from callback_arg of golioth_rpc_register

Return values

GOLIOTH_RPC_OK	method was called successfully
GOLIOTH_RPC_INVALID_ARGUMENT	params were invalid

Returns

otherwise - method failure

Definition at line 1 of file rpc.h.

Enumeration Type Documentation

golioth_rpc_status

enum golioth_rpc_status

Enumeration of RPC status codes, sent in the RPC response.

Enumerator
GOLIOTH_RPC_OK
GOLIOTH_RPC_CANCELED
GOLIOTH_RPC_UNKNOWN
GOLIOTH_RPC_INVALID_ARGUMENT
GOLIOTH_RPC_DEADLINE_EXCEEDED
GOLIOTH_RPC_NOT_FOUND
GOLIOTH_RPC_ALREADYEXISTS
GOLIOTH_RPC_PERMISSION_DENIED
GOLIOTH_RPC_RESOURCE_EXHAUSTED
GOLIOTH_RPC_FAILED_PRECONDITION
GOLIOTH_RPC_ABORTED
GOLIOTH_RPC_OUT_OF_RANGE
GOLIOTH_RPC_UNIMPLEMENTED
GOLIOTH_RPC_INTERNAL
GOLIOTH_RPC_UNAVAILABLE
GOLIOTH_RPC_DATA_LOSS
GOLIOTH_RPC_UNAUTHENTICATED

Definition at line 20 of file rpc.h.

Function Documentation

golioth_rpc_init()

struct golioth_rpc * golioth_rpc_init

(

struct golioth_client *

client

)

Initialize the RPC service

Parameters

client

Golioth client handle

Returns

pointer to golioth rpc struct

NULL - Error initializing RPC service

golioth_rpc_register()

enum golioth_status golioth_rpc_register	(	struct golioth_rpc *	grpc,
		const char *	method,
		golioth_rpc_cb_fn	callback,
		void *	callback_arg )

Register an RPC method

Parameters

grpc	Golioth RPC service handle
method	The name of the method to register
callback	The callback to be invoked, when an RPC request with matching method name is received by the client.
callback_arg	User data forwarded to callback when invoked. Optional, can be NULL.

Returns

GOLIOTH_OK - RPC method successfully registered

otherwise - Error registering RPC method