Initial commit

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

6 files changed, 611 insertions, 0 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..45ec515
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+*.c	diff=cpp
+*.h	diff=cpp
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..35bb9cf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.swp
+*~
+
+wasmtime-wasi-http
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f433b1a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
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+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..fa8a566
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+CC      = gcc
+CFLAGS  = -Wall -Wextra -g -DWASM_MODULE="\"$(WASM_MODULE)\"" -I$(WASMTIME_C_API)/include -L$(WASMTIME_C_API)/lib
+LDFLAGS = -Wl,-rpath,$(WASMTIME_C_API)/lib
+
+all: wasmtime-wasi-http
+
+wasmtime-wasi-http: wasmtime-wasi-http.c
+	$(CC) $(CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $< -lwasmtime
+
+clean:
+	rm -f wasmtime-wasi-http
diff --git a/README b/README
new file mode 100644
index 0000000..822d1df
--- /dev/null
+++ b/README
@@ -0,0 +1,72 @@
+Project Blackbird
+=================
+
+Make Fermyon Spin WebAssembly Modules run on NGINX Unit.
+
+The repository will contain some exploratory tools.
+
+Quickstart
+==========
+
+Clone the spin repository
+
+$ git clone https://github.com/fermyon/spin.git
+
+Build the wasm module.
+
+$ cd spin/examples/wasi-http-rust
+$ cargo build --target wasm32-wasi
+
+Grab the Wasmtime C API
+
+$ wget -O- https://github.com/bytecodealliance/wasmtime/releases/download/v13.0.0/wasmtime-v13.0.0-x86_64-linux-c-api.tar.xz | tar -xvf -
+
+Clone this repository
+
+$ git clone git://git.digital-domain.net/project_blackbird.git
+
+Build it
+
+$ cd project_blackbird
+$ make WASMTIME_C_API=/path/to/wasmtime-c-api WASM_MODULE=/path/to/spin/examples/wasi-http-rust/target/wasm32-wasi/debug/wasi_http_rust.wasm
+
+Run it
+
+$ ./wasmtime-wasi-http
+Initializing...
+Loading binary...
+Compiling module...
+Setting function imports...
+    [poll2::poll-oneoff]
+    [streams2::read]
+    [streams2::blocking-read]
+    [streams2::subscribe-to-input-stream]
+    [streams2::write]
+    [streams2::blocking-write]
+    [streams2::subscribe-to-output-stream]
+    [default-outgoing-HTTP2::handle]
+    [types2::new-fields]
+    [types2::fields-entries]
+    [types2::finish-incoming-stream]
+    [types2::finish-outgoing-stream]
+    [types2::incoming-request-method]
+    [types2::incoming-request-path-with-query]
+    [types2::incoming-request-headers]
+    [types2::incoming-request-consume]
+    [types2::new-outgoing-request]
+    [types2::outgoing-request-write]
+    [types2::set-response-outparam]
+    [types2::incoming-response-status]
+    [types2::incoming-response-headers]
+    [types2::incoming-response-consume]
+    [types2::new-outgoing-response]
+    [types2::outgoing-response-write]
+    [types2::future-incoming-response-get]
+    [types2::listen-to-future-incoming-response]
+Initialising WASI...
+Instantiating module...
+Getting function exports...
+    [HTTP#handle]
+    [cabi_realloc]
+Shutting down...
+Done.
diff --git a/wasmtime-wasi-http.c b/wasmtime-wasi-http.c
new file mode 100644
index 0000000..8b8ddff
--- /dev/null
+++ b/wasmtime-wasi-http.c
@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) Andrew Clayton
+ * Copyright (C) F5, Inc.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <wasm.h>
+#include <wasi.h>
+#include <wasmtime.h>
+
+static void exit_with_error(const char *message, wasmtime_error_t *error,
+			    wasm_trap_t *trap)
+{
+	wasm_byte_vec_t error_message;
+
+	fprintf(stderr, "error: %s\n", message);
+	if (error != NULL) {
+		wasmtime_error_message(error, &error_message);
+		wasmtime_error_delete(error);
+	} else {
+		wasm_trap_message(trap, &error_message);
+		wasm_trap_delete(trap);
+	}
+	fprintf(stderr, "%.*s\n", (int) error_message.size, error_message.data);
+	wasm_byte_vec_delete(&error_message);
+
+	exit(EXIT_FAILURE);
+}
+
+static wasm_trap_t *dummy_func(void *env, wasmtime_caller_t *caller,
+			       const wasmtime_val_t *args, size_t nargs,
+			       wasmtime_val_t *results, size_t nresults)
+{
+	(void)env;
+	(void)caller;
+	(void)args;
+	(void)nargs;
+	(void)results;
+	(void)nresults;
+
+	return NULL;
+}
+
+static wasm_functype_t *create_wasm_func(const wasm_valkind_t *pk,
+					 size_t nr_params,
+					 const wasm_valkind_t *rk,
+					 size_t nr_results)
+{
+	wasm_valtype_t *pt[14];
+	wasm_valtype_t *rt[1];
+	wasm_valtype_vec_t params;
+	wasm_valtype_vec_t results;
+
+	if (nr_params > 0) {
+		for (size_t i = 0; i < nr_params; i++)
+			pt[i] = wasm_valtype_new(pk[i]);
+		wasm_valtype_vec_new(&params, nr_params, pt);
+	} else {
+		wasm_valtype_vec_new_empty(&params);
+	}
+
+	if (nr_results > 0) {
+		for (size_t i = 0; i < nr_results; i++)
+			rt[i] = wasm_valtype_new(rk[i]);
+		wasm_valtype_vec_new(&results, nr_results, rt);
+	} else {
+		wasm_valtype_vec_new_empty(&results);
+	}
+
+	return wasm_functype_new(&params, &results);
+}
+
+static inline size_t rg(const char *s)
+{
+	return strlen(s);
+}
+
+/*
+ * Argument counting macros gleamed from
+ * https://gist.github.com/christophercrouzet/db9bbb07d427381253a91210e7ddc68d
+ */
+#define ARG( \
+	_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, ...) \
+	_14
+#define COUNT_ARGS(...) \
+	ARG(__VA_ARGS__, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,)
+
+#define SET_VALS(type, ...) \
+	.type	   = { __VA_ARGS__ }, \
+	.nr_##type = COUNT_ARGS(__VA_ARGS__)
+
+#define SET_FUNC(function, function_name, module) \
+	.func_name    = function_name, \
+	.func_namelen = strlen(function_name), \
+	.mod_name     = module, \
+	.mod_namelen  = strlen(module), \
+	.func	      = dummy_func
+
+static void set_function_imports(wasmtime_linker_t *linker)
+{
+	static const struct {
+		const char                *func_name;
+		int			  func_namelen;
+		const char		  *mod_name;
+		int			  mod_namelen;
+
+		wasmtime_func_callback_t  func;
+
+		wasm_valkind_t            params[14];
+		size_t			  nr_params;
+		wasm_valkind_t            results[1];
+		size_t			  nr_results;
+	} import_functions[] = {
+		{
+			SET_FUNC(poll_oneoff, "poll-oneoff", "poll2"),
+			SET_VALS(params, WASM_I32, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(read, "read", "streams2"),
+			SET_VALS(params, WASM_I32, WASM_I64, WASM_I32),
+		}, {
+			SET_FUNC(blocking_read, "blocking-read", "streams2"),
+			SET_VALS(params, WASM_I32, WASM_I64, WASM_I32),
+		}, {
+			SET_FUNC(subscribe_to_input_stream,
+				"subscribe-to-input-stream", "streams2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(write, "write", "streams2"),
+			SET_VALS(params,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(blocking_write, "blocking-write", "streams2"),
+			SET_VALS(params,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(subscribe_to_output_stream,
+				"subscribe-to-output-stream", "streams2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(handle, "handle", "default-outgoing-HTTP2"),
+			SET_VALS(params,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(new_fields, "new-fields", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(fields_entries, "fields-entries", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(finish_incoming_stream,
+				"finish-incoming-stream", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(finish_outgoing_stream,
+				"finish-outgoing-stream", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(incoming_request_method,
+				"incoming-request-method", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(incoming_request_path_with_query,
+				"incoming-request-path-with-query", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(incoming_request_headers,
+				"incoming-request-headers", "types2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(incoming_request_consume,
+				"incoming-request-consume", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(new_outgoing_request, "new-outgoing-request",
+				"types2"),
+			SET_VALS(params,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32,
+				 WASM_I32, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(outgoing_request_write,
+				"outgoing-request-write", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(set_response_outparam,
+				 "set-response-outparam", "types2"),
+			SET_VALS(params,
+				 WASM_I32, WASM_I32, WASM_I32, WASM_I32,
+				 WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(incoming_response_status,
+				"incoming-response-status", "types2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(incoming_response_headers,
+				"incoming-response-headers", "types2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(incoming_response_consume,
+				"incoming-response-consume", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(new_outgoing_response,
+				"new-outgoing-response", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		}, {
+			SET_FUNC(outgoing_response_write,
+				"outgoing-response-write", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(future_incoming_response-get,
+				"future-incoming-response-get", "types2"),
+			SET_VALS(params, WASM_I32, WASM_I32),
+		}, {
+			SET_FUNC(listen_to_fauture_incoming_response,
+				"listen-to-future-incoming-response",
+				"types2"),
+			SET_VALS(params, WASM_I32),
+			SET_VALS(results, WASM_I32),
+		},
+
+		{ }
+	}, *imf;
+
+	for (imf = import_functions; imf->func_name != NULL; imf++) {
+		wasm_functype_t  *func_ty;
+
+		printf("    [%s::%s]\n", imf->mod_name, imf->func_name);
+
+		func_ty = create_wasm_func(imf->params, imf->nr_params,
+					   imf->results, imf->nr_results);
+		wasmtime_linker_define_func(linker,
+					    imf->mod_name, imf->mod_namelen,
+					    imf->func_name, imf->func_namelen,
+					    func_ty,  imf->func, NULL, NULL);
+		wasm_functype_delete(func_ty);
+	}
+}
+
+int main(void)
+{
+	wasm_engine_t *engine;
+	wasmtime_store_t *store;
+	wasmtime_context_t *context;
+	wasmtime_module_t *module = NULL;
+	wasmtime_linker_t *linker;
+	wasmtime_error_t *error;
+	wasm_byte_vec_t wasm;
+	wasmtime_extern_t item;
+	wasi_config_t *wasi_config;
+	FILE *file;
+	size_t file_size;
+	bool ok;
+
+	printf("Initializing...\n");
+	engine = wasm_engine_new();
+	store = wasmtime_store_new(engine, NULL, NULL);
+	context = wasmtime_store_context(store);
+
+	linker = wasmtime_linker_new(engine);
+	error = wasmtime_linker_define_wasi(linker);
+	if (error != NULL)
+		exit_with_error("failed to link wasi", error, NULL);
+
+	printf("Loading binary...\n");
+	file = fopen(WASM_MODULE, "r");
+	if (!file) {
+		printf("> Error loading file!\n");
+		exit(EXIT_FAILURE);
+	}
+	fseek(file, 0L, SEEK_END);
+	file_size = ftell(file);
+	wasm_byte_vec_new_uninitialized(&wasm, file_size);
+	fseek(file, 0L, SEEK_SET);
+	if (fread(wasm.data, file_size, 1, file) != 1) {
+		printf("> Error loading module!\n");
+		exit(EXIT_FAILURE);
+	}
+	fclose(file);
+
+	printf("Compiling module...\n");
+	error = wasmtime_module_new(engine, (uint8_t*)wasm.data, wasm.size,
+				    &module);
+	if (!module)
+		exit_with_error("failed to compile module", error, NULL);
+	wasm_byte_vec_delete(&wasm);
+
+	printf("Setting function imports...\n");
+	set_function_imports(linker);
+
+	printf("Initialising WASI...\n");
+	wasi_config = wasi_config_new();
+	wasi_config_inherit_env(wasi_config);
+	wasi_config_inherit_stdin(wasi_config);
+	wasi_config_inherit_stdout(wasi_config);
+	wasi_config_inherit_stderr(wasi_config);
+	error = wasmtime_context_set_wasi(context, wasi_config);
+	if (error)
+		exit_with_error("failed to initialise WASI", error, NULL);
+
+	printf("Instantiating module...\n");
+	error = wasmtime_linker_module(linker, context, "", 0, module);
+	if (error != NULL)
+		exit_with_error("failed to instantiate module", error, NULL);
+
+	printf("Getting function exports...\n");
+	ok = wasmtime_linker_get(linker, context, "", 0, "HTTP#handle", 11,
+				 &item);
+	if (!ok) {
+		printf("> Error getting function export [HTTP#handle]\n");
+		exit(EXIT_FAILURE);
+	}
+	printf("    [HTTP#handle]\n");
+
+	ok = wasmtime_linker_get(linker, context, "", 0, "cabi_realloc", 12,
+				 &item);
+	if (!ok) {
+		printf("> Error getting function export [cabi_realloc]\n");
+		exit(EXIT_FAILURE);
+	}
+	printf("    [cabi_realloc]\n");
+
+	printf("Shutting down...\n");
+	wasmtime_module_delete(module);
+	wasmtime_store_delete(store);
+	wasm_engine_delete(engine);
+
+	printf("Done.\n");
+
+	exit(EXIT_SUCCESS);;
+}