Technical Explanation

7. Technical Explanation#

7.1. What is WebAssembly?#

WebAssembly (WASM) is a binary instruction format based on a stack-based virtual machine, designed as a portable target for high-level languages such as C, C++, and Rust. It enables deployment in both client-side and server-side applications. For more details, refer to the official WebAssembly documentation <https://webassembly.org/docs/>.

7.2. Creating Custom WASM Files#

  1. Write Code: Develop backend task logic in your preferred programming language.

  2. Compile to WASM: Compile your code into a WASM file. Examples for Python and C:

    • Python: Use py2wasm to compile Python code into WASM.

    • C: Use Emscripten to compile C code into WASM.

  3. Upload to MailTrigger: Upload the compiled WASM file to the MailTrigger system and set the execution interval (in seconds).

7.3. Sample Program#

Below is a simple example program demonstrating how to make http requests in Python and compile it into WebAssembly format:

# example.py

import json

# Get the current task information from the workspace's input.json
with open("./input.json", "r", encoding="utf8") as f:
    input = json.loads(f.read())
    mailboxId = input["mailboxId"]
    taskId = input["taskId"]

# Write the parameters for executing the request
with open("/requests/get.txt", "w", encoding="utf8") as f:
    config = json.dumps(
        {
            "url": "https://jsonplaceholder.typicode.com/posts/1"
        }
    )
    f.write(config)

# Actually execute the request and get the response
with open("/requests/response.txt", "r", encoding="utf8") as f:
    response = f.read()

After compiling the above program into WebAssembly format, it can be uploaded and used within the MailTrigger system.

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