static int rpc_sum(char *buf, int len, struct ns_rpc_request *req) {
double sum = 0;
int i;
if (req->params[0].type != JSON_TYPE_ARRAY) {
return ns_rpc_create_std_error(buf, len, req,
JSON_RPC_INVALID_PARAMS_ERROR);
}
for (i = 0; i < req->params[0].num_desc; i++) {
if (req->params[i + 1].type != JSON_TYPE_NUMBER) {
return ns_rpc_create_std_error(buf, len, req,
JSON_RPC_INVALID_PARAMS_ERROR);
}
sum += strtod(req->params[i + 1].ptr, NULL);
}
return ns_rpc_create_reply(buf, len, req, "f", sum);
}
/*
* Dispatches a JSON-RPC request.
*
* Parses JSON-RPC request contained in `buf`, `len`. Then, dispatches the
*request
* to the correct handler method. Valid method names should be specified in NULL
* terminated array `methods`, and corresponding handlers in `handlers`.
* Result is put in `dst`, `dst_len`. Return: length of the result, which
* can be larger then `dst_len` that indicates an overflow.
*/
int ns_rpc_dispatch(const char *buf, int len, char *dst, int dst_len,
const char **methods, ns_rpc_handler_t *handlers) {
struct json_token tokens[200];
struct ns_rpc_request req;
int i, n;
memset(&req, 0, sizeof(req));
n = parse_json(buf, len, tokens, sizeof(tokens) / sizeof(tokens[0]));
if (n <= 0) {
int err_code = (n == JSON_STRING_INVALID) ? JSON_RPC_PARSE_ERROR
: JSON_RPC_SERVER_ERROR;
return ns_rpc_create_std_error(dst, dst_len, &req, err_code);
}
req.message = tokens;
req.id = find_json_token(tokens, "id");
req.method = find_json_token(tokens, "method");
req.params = find_json_token(tokens, "params");
if (req.id == NULL || req.method == NULL) {
return ns_rpc_create_std_error(dst, dst_len, &req,
JSON_RPC_INVALID_REQUEST_ERROR);
}
for (i = 0; methods[i] != NULL; i++) {
int mlen = strlen(methods[i]);
if (mlen == req.method->len &&
memcmp(methods[i], req.method->ptr, mlen) == 0)
break;
}
if (methods[i] == NULL) {
return ns_rpc_create_std_error(dst, dst_len, &req,
JSON_RPC_METHOD_NOT_FOUND_ERROR);
}
return handlers[i](dst, dst_len, &req);
}
