support returning strings for cross-client compatibility

Author: shikokuchuo

R/ncurl.R

@@ -271,46 +271,3 @@ as.promise.ncurlAio <- function(x) {
 #' @exportS3Method promises::is.promising
 #'
 is.promising.ncurlAio <- function(x) TRUE
-
-#' Start REST Server
-#'
-#' Creates an instance of an HTTP REST server which evaluates R expressions sent
-#'     to it [EXPERIMENTAL]. As arbitrary R expressions are evaluated, this
-#'     should only be deployed on the local machine (using the 127.0.0.1
-#'     loopback address) in a trusted environment.
-#'
-#' @param url full http address including hostname, port and path at which to
-#'     host the server.
-#'
-#' @details Query the API with an HTTP client using the \sQuote{POST} method,
-#'     with the request data being the R expression as a text string. The
-#'     received response body will consist of the serialized evaluation result.
-#'     Unserialize to return an R object.
-#'
-#'     Use only in a new session. Use \sQuote{ctrl + \\} to forcibly quit
-#'     when finished as the function blocks with no means of interruption.
-#'
-#'     Currently still experimental as the server lacks error handling. Sending
-#'     an invalid R expression will cause the server to exit.
-#'
-#' @return This function never returns.
-#'
-#' @examples
-#' if (interactive()) {
-#'
-#' # run in a new session:
-#' # nanonext::server()
-#'
-#' res <- ncurl("http://127.0.0.1:5555/api/rest",
-#'              convert = FALSE,
-#'              method = "POST",
-#'              data = "Sys.time()")
-#'
-#' if (!is_error_value(res$data)) unserialize(res$data)
-#'
-#' }
-#'
-#' @export
-#'
-server <- function(url = "http://127.0.0.1:5555/api/rest")
-  .Call(rnng_rest_server, url)

R/server.R

@@ -0,0 +1,71 @@
+# Copyright (C) 2022-2024 Hibiki AI Limited <[email protected]>
+#
+# This file is part of nanonext.
+#
+# nanonext is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+#
+# nanonext is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# nanonext. If not, see <https://www.gnu.org/licenses/>.
+
+# nanonext - server - HTTP REST Server -----------------------------------------
+
+#' Start REST Server
+#'
+#' Creates an instance of an HTTP REST server which evaluates R expressions sent
+#'     to it [EXPERIMENTAL]. As arbitrary R expressions are evaluated, this
+#'     should only be deployed on the local machine (using the 127.0.0.1
+#'     loopback address) in a trusted environment.
+#'
+#' @param url full http address including hostname, port and path at which to
+#'     host the server.
+#'
+#' @details Query the API with an HTTP client using the \sQuote{POST} method,
+#'     with the request data being the R expression as a text string. The
+#'     received response body will consist of the evaluation result as a text
+#'     string (if of the appropriate type), or otherwise a serialized R object,
+#'     which should be passed to \code{\link{unserialize}}.
+#'
+#'     Use only in a new session. Use \sQuote{ctrl + \\} to forcibly quit
+#'     when finished as the function blocks with no means of interruption.
+#'
+#'     Currently still experimental as the server lacks error handling. Sending
+#'     an invalid R expression will cause the server to quit.
+#'
+#' @return This function never returns.
+#'
+#' @examples
+#' if (interactive()) {
+#'
+#' # run server in a new session:
+#' # Rscript -e 'nanonext::server()'
+#'
+#' # query using curl:
+#' # curl -X POST http://127.0.0.1:5555/api/rest -d 'format(Sys.time())'
+#'
+#' ncurl(
+#'   "http://127.0.0.1:5555/api/rest",
+#'   method = "POST",
+#'   data = "format(Sys.time())"
+#' )
+#'
+#' res <- ncurl(
+#'   "http://127.0.0.1:5555/api/rest",
+#'   convert = FALSE,
+#'   method = "POST",
+#'   data = "data.frame(random = nanonext::random(3))"
+#' )
+#' if (!is_error_value(res$data)) unserialize(res$data)
+#'
+#' }
+#'
+#' @export
+#'
+server <- function(url = "http://127.0.0.1:5555/api/rest")
+  .Call(rnng_rest_server, url)

man/server.Rd

@@ -253,7 +253,13 @@ void inproc_server(const char* url) {
     const char *body = nng_msg_body(msg);
     nano_buf buf;
     SEXP res = R_ParseEvalString(body, R_GlobalEnv);
-    nano_serialize(&buf, res, R_NilValue);
+    if (TYPEOF(res) == STRSXP) {
+      const char *string = NANO_STRING(res);
+      buf.buf = (unsigned char *) string;
+      buf.cur = strlen(string);
+    } else {
+      nano_serialize(&buf, res, R_NilValue);
+    }
     nng_msg_clear(msg);
     nng_msg_append(msg, buf.buf, buf.cur);
     if ((xc = nng_sendmsg(s, msg, 0)))