feat(extension) Replace rust-cpython with pyo3

Cargo.toml

@@ -14,8 +14,9 @@ name = "wasmer"
 crate-type = ["cdylib"]
 
 [dependencies]
-cpython = { version = "0.2", features = ["extension-module"] }
-wasmer-runtime = { git = "https://github.com/wasmerio/wasmer", branch = "master" }
+wasmer-runtime = "0.3.0"
+wasmer-runtime-core = "0.3.0"
+pyo3 = { version = "0.6.0", features = ["extension-module"] }
 
 [package.metadata.pyo3-pack]
 classifier = [

README.md

@@ -60,7 +60,7 @@ from wasmer import Instance, Value
 
 wasm_bytes = open('simple.wasm', 'rb').read()
 instance = Instance(wasm_bytes)
-result = instance.call('sum', [Value.i32(5), Value.i32(37)])
+result = instance.exports.sum(5, 37)
 
 print(result) # 42!
 ```
@@ -88,11 +88,18 @@ wasm_bytes = open('my_program.wasm', 'rb').read()
 instance = Instance(wasm_bytes)
 
 # Call a function on it.
-result = instance.call('sum', [Value.i32(1), Value.i32(2)])
+result = instance.exports.sum(1, 2)
 
 print(result) # 3
 ```
 
+All exported functions are accessible on the `exports` getter.
+Arguments of these functions are automatically casted to WebAssembly
+values. If one wants to explicitely pass a value of a particular type,
+it is possible to use the `Value` class,
+e.g. `instance.exports.sum(Value.i32(1), Value.i32(2))`. Note that for
+most usecases, this is not necessary.
+
 ### The `Value` class
 
 Builds WebAssembly values with the correct types:
@@ -141,7 +148,8 @@ All these classes share the same implementation. Taking the example of
 
 ```python
 class Uint8MemoryView:
-    BYTES_PER_ELEMENT = 1
+    @property
+    def bytes_per_element()
 
     def __len__()
     def __getitem__(index)
@@ -160,7 +168,7 @@ wasm_bytes = open('my_program.wasm', 'rb').read()
 instance = Instance(wasm_bytes)
 
 # Call a function that returns a pointer to a string for instance.
-pointer = instance.call('return_string')
+pointer = instance.exports.return_string()
 
 # Get the memory view, with the offset set to `pointer` (default is 0).
 memory = instance.uint8_memory_view(pointer)

examples/memory.py

@@ -5,7 +5,7 @@
 
 wasm_bytes = open(__dir__ + '/memory.wasm', 'rb').read()
 instance = Instance(wasm_bytes)
-pointer = instance.call('return_hello')
+pointer = instance.exports.return_hello()
 
 memory = instance.uint8_memory_view(pointer)
 nth = 0;

examples/simple.py

@@ -1,10 +1,11 @@
-from wasmer import Instance, Value
+from wasmer import Instance, Value, Uint8MemoryView
 import os
 
 __dir__ = os.path.dirname(os.path.realpath(__file__))
 
 wasm_bytes = open(__dir__ + '/simple.wasm', 'rb').read()
 instance = Instance(wasm_bytes)
-result = instance.call('sum', [Value.i32(5), Value.i32(37)])
+
+result = instance.exports.sum(1, 2)
 
 print(result) # 42!

justfile

@@ -1,9 +1,9 @@
 # Install the environment to develop the extension.
 prelude:
-        pip3 install pyo3-pack
-        cargo install pyo3-pack
         pip3 install virtualenv
         virtualenv -p $(which python3) .env
+        source .env/bin/activate
+        pip3 install pyo3-pack pytest pytest-benchmark
 
 # Setup the environment to develop the extension.
 wakeup:
@@ -17,19 +17,19 @@ sleep:
 rust:
         export PYTHON_SYS_EXECUTABLE=$(which python3)
         cargo check
-        pyo3-pack develop --release --strip
+        pyo3-pack develop --binding_crate pyo3 --release --strip
 
 # Run Python.
 python-run file='':
-        .env/bin/python {{file}}
+        @python {{file}}
 
 # Run the tests.
 test:
-        @.env/bin/python tests/init.py
+        @py.test tests
 
 # Inspect the `python-ext-wasm` extension.
 inspect:
-	.env/bin/python -c "help('wasmer')"
+	@python -c "help('wasmer')"
 
 # Local Variables:
 # mode: makefile

rust-toolchain

@@ -0,0 +1 @@
+nightly