Use Extism PDK for Python to send HTTP(s) requests from inside WASM

Instructions for this devcontainer

Tested with Extism Python PDK commit 967e40d9, Extism CLI v1.5.4.

Preparation

1. Open this repo in devcontainer, e.g. using Github Codespaces. Type or copy/paste following commands to devcontainer's terminal.

2. Install extism-python-pdk and its dependencies like Binaryen's wasm-merge and wasm-opt by invoking the official installation script:

curl -sSL -O https://github.com/extism/python-pdk/raw/967e40d9355707b509a78090b150079ed08878bd/install.sh
sh install.sh

Building

1. Compile the example by using just-installed extism-py binary:

extism-py httpget.py -o HTTPRequestingPlugin.wasm

Test with Extism CLI

For testing purposes, you can invoke functions from Extism plugins with Extism CLI.

1. Install Extism CLI from Github releases:

wget https://github.com/extism/cli/releases/download/v1.5.4/extism-v1.5.4-linux-amd64.tar.gz -O /tmp/extism.tar.gz
tar -xzf /tmp/extism.tar.gz -C /tmp ; mv /tmp/extism .

And now you have extism binary in current folder.

2. Run httpget function from extism plugin with CLI, allowing outbound connections to all hosts:

./extism call HTTPRequestingPlugin.wasm httpget --allow-host '*' --wasi

Finish

Perform your own experiments if desired.

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