Initial commitv0.1.0

libunit-wasm and example C and Rust WebAssembly modules for NGINX Unit.

Co-developed-by: Timo Stark <t.stark@nginx.com>
Co-developed-by: Liam Crilly <liam@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/examples/c/luw-echo-request.c b/examples/c/luw-echo-request.c
new file mode 100644
index 0000000..5655c65
--- /dev/null
+++ b/examples/c/luw-echo-request.c
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+/*
+ * examples/c/luw-echo-request.c - Example of writing a WASM module for use
+ *				   with Unit using libunit-wasm
+ *
+ * Copyright (C) Andrew Clayton
+ * Copyright (C) F5, Inc.
+ */
+
+#define _XOPEN_SOURCE	500
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "unit/unit-wasm.h"
+
+static u8 *request_buf;
+
+__luw_export_name("luw_module_end_handler")
+void luw_module_end_handler(void)
+{
+	free(request_buf);
+}
+
+__luw_export_name("luw_module_init_handler")
+void luw_module_init_handler(void)
+{
+	request_buf = malloc(luw_mem_get_init_size());
+}
+
+static bool hdr_iter_func(luw_ctx_t *ctx, const char *name, const char *value,
+			  void *user_data __luw_unused)
+{
+	luw_mem_writep(ctx, "%s = %s\n", name, value);
+
+	return true;
+}
+
+__luw_export_name("luw_request_handler")
+int luw_request_handler(u8 *addr)
+{
+	luw_ctx_t ctx;
+	char clen[32];
+	const char *method;
+
+	luw_init_ctx(&ctx, addr, 4096 /* Response offset */);
+	/* Take a copy of the request and use that */
+	luw_set_req_buf(&ctx, &request_buf, LUW_SRB_NONE);
+
+#define BUF_ADD(fmt, member) \
+	luw_mem_writep(&ctx, fmt, luw_get_http_##member(&ctx));
+
+	luw_mem_writep(&ctx,
+		       " *** Welcome to WebAssembly on Unit! "
+		       "[libunit-wasm (%d.%d.%d/%#0.8x)] ***\n\n",
+		       LUW_VERSION_MAJOR, LUW_VERSION_MINOR, LUW_VERSION_PATCH,
+		       LUW_VERSION_NUMBER);
+
+	luw_mem_writep(&ctx, "[Request Info]\n");
+	BUF_ADD("REQUEST_PATH = %s\n", path);
+	BUF_ADD("METHOD       = %s\n", method);
+	BUF_ADD("VERSION      = %s\n", version);
+	BUF_ADD("QUERY        = %s\n", query);
+	BUF_ADD("REMOTE       = %s\n", remote);
+	BUF_ADD("LOCAL_ADDR   = %s\n", local_addr);
+	BUF_ADD("LOCAL_PORT   = %s\n", local_port);
+	BUF_ADD("SERVER_NAME  = %s\n", server_name);
+
+	luw_mem_writep(&ctx, "\n[Request Headers]\n");
+
+	luw_http_hdr_iter(&ctx, hdr_iter_func, NULL);
+
+	method = luw_get_http_method(&ctx);
+	if (memcmp(method, "POST", strlen(method)) == 0 ||
+	    memcmp(method, "PUT", strlen(method)) == 0) {
+		luw_mem_writep(&ctx, "\n[%s data]\n", method);
+		luw_mem_writep_data(&ctx, luw_get_http_content(&ctx),
+				    luw_get_http_content_len(&ctx));
+		luw_mem_writep(&ctx, "\n");
+	}
+
+	luw_http_init_headers(&ctx, 2, 0);
+
+	snprintf(clen, sizeof(clen), "%lu", luw_get_response_data_size(&ctx));
+	luw_http_add_header(&ctx, 0, "Content-Type", "text/plain");
+	luw_http_add_header(&ctx, 1, "Content-Length", clen);
+
+	luw_http_send_headers(&ctx);
+
+	luw_http_send_response(&ctx);
+	/* Tell Unit no more data to send */
+	luw_http_response_end();
+
+	return 0;
+}