Add a wasi-http 0.2.0 large-upload component in C

This makes use of the 'reactor' adaptor for filesystem access via the
preopens method.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/c/wasi-http/0.2.0/large-upload/component.c b/c/wasi-http/0.2.0/large-upload/component.c
new file mode 100644
index 0000000..148100d
--- /dev/null
+++ b/c/wasi-http/0.2.0/large-upload/component.c
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+/*
+ * component.c - Example of writing a wasi-http Wasm component
+ *
+ * Copyright (C) Andrew Clayton
+ * Copyright (C) F5, Inc.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "proxy.h"
+
+#define ex(...) \
+        do { \
+                printf(__VA_ARGS__); \
+		return; \
+        } while (0)
+
+void exports_wasi_http_incoming_handler_handle(
+	exports_wasi_http_incoming_handler_own_incoming_request_t request,
+	exports_wasi_http_incoming_handler_own_response_outparam_t response_out)
+{
+	wasi_http_types_borrow_incoming_request_t b_req;
+	wasi_http_types_own_incoming_body_t r_body;
+	wasi_http_types_borrow_incoming_body_t b_r_body;
+	wasi_http_types_result_own_outgoing_response_error_code_t rerr = { };
+	wasi_http_types_own_fields_t hdrs;
+	wasi_http_types_borrow_fields_t b_hdrs;
+	wasi_http_types_own_fields_t fields;
+	wasi_http_types_own_input_stream_t in_stream;
+	wasi_io_streams_borrow_input_stream_t b_in_stream;
+	wasi_io_streams_stream_error_t in_stream_err;
+	proxy_list_u8_t data;
+	proxy_list_field_value_t f_clen;
+	unsigned long long total_bytes_wrote = 0;
+	unsigned long long content_len;
+	bool ok;
+	int fd;
+
+	fd = open("/var/tmp/wasm-wasi-component-upload.dat",
+		  O_CREAT|O_TRUNC|O_WRONLY, 0666);
+
+	b_req = wasi_http_types_borrow_incoming_request(request);
+
+	hdrs = wasi_http_types_method_incoming_request_headers(b_req);
+	b_hdrs = wasi_http_types_borrow_fields(hdrs);
+
+	wasi_http_types_method_fields_get(
+			b_hdrs,
+			&(proxy_string_t){ .ptr = (uint8_t *)"content-length",
+					   .len = strlen("content-length") },
+			&f_clen);
+
+	content_len = strtoull((const char *)f_clen.ptr[0].ptr, NULL, 10);
+
+	ok = wasi_http_types_method_incoming_request_consume(b_req, &r_body);
+        if (!ok)
+                ex("wasi_http_types_method_incoming_request_consume() failed\n");
+        b_r_body = wasi_http_types_borrow_incoming_body(r_body);
+        ok = wasi_http_types_method_incoming_body_stream(b_r_body, &in_stream);
+        if (!ok)
+                ex("wasi_http_types_method_incoming_body_stream() failed\n");
+	b_in_stream = wasi_io_streams_borrow_input_stream(in_stream);
+
+	do {
+		ok = wasi_io_streams_method_input_stream_blocking_read(
+							b_in_stream,
+							8 * 1024*1024,
+							&data,
+							&in_stream_err);
+		if (!ok)
+			break;
+
+		write(fd, data.ptr, data.len);
+		total_bytes_wrote += data.len;
+	} while (total_bytes_wrote < content_len);
+
+	fields = wasi_http_types_constructor_fields();
+	wasi_http_types_constructor_outgoing_response(fields);
+	wasi_http_types_static_response_outparam_set(response_out, &rerr);
+
+	close(fd);
+}