slim down module size by excluding unecessary files

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Author: dicej

Makefile

@@ -1,8 +1,8 @@
 .PHONY: build
-build: target/config.txt
+build: target/config.txt target/lib
 	PYO3_CONFIG_FILE=$$(pwd)/target/config.txt cargo build --release --target=wasm32-wasi
 	wasi-vfs/target/release/wasi-vfs pack target/wasm32-wasi/release/python_wasi.wasm \
-		--mapdir lib::$$(pwd)/cpython/builddir/wasi/install/lib \
+		--mapdir lib::$$(pwd)/target/lib \
 		-o target/wasm32-wasi/release/python-wasi-vfs.wasm
 	PYTHONPATH=/py wizer target/wasm32-wasi/release/python-wasi-vfs.wasm \
 		--inherit-env true --wasm-bulk-memory true --allow-wasi --dir py \
@@ -12,3 +12,7 @@ target/config.txt:
 	mkdir -p target
 	cp config.txt target
 	echo "lib_dir=$$(pwd)/cpython/builddir/wasi" >> $@
+
+target/lib:
+	mkdir -p $@
+	rsync -a --exclude='*.a' --exclude='*.pyc' --exclude='*.whl' cpython/builddir/wasi/install/lib/python3.11 $@

README.md

@@ -9,6 +9,7 @@ This is an experiment to build a Spin Python SDK using CPython, wasi-vfs, and Py
 - [wasi-sdk](https://github.com/WebAssembly/wasi-sdk) v16 or later
 - [Wizer](https://github.com/bytecodealliance/wizer) v1.6.0 or later
 - [Spin](https://github.com/fermyon/spin)
+- [rsync](https://rsync.samba.org/) -- used at build time for copying files around; we could replace this with something more portable, if desired
 
 ## Building and Running
 

src/lib.rs

@@ -18,6 +18,7 @@ struct HttpRequest<'a> {
     method: &'a str,
     uri: &'a str,
     headers: Vec<(&'a str, &'a str)>,
+    // todo: this should be a byte slice, but make sure it gets converted to/from Python correctly
     body: Option<&'a str>,
 }
 
@@ -36,6 +37,7 @@ impl IntoPy<PyObject> for HttpRequest<'_> {
 struct HttpResponse {
     status: u16,
     headers: Vec<(String, String)>,
+    // todo: this should be a byte slice, but make sure it gets converted to/from Python correctly
     body: Option<String>,
 }