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README.md

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Build your own function to handle ChangeStream event.

Requirements

  • rust
  • wasm32-wasi target

Coding

write your code in the event_handler function in lib.rs.

/// implement by user
fn handle_event(event: ChangeStreamEvent<Document>) -> anyhow::Result<()> {
    println!("handle event: {:?}", event);
    if event.operation_type == OperationType::Delete {
        return Err(anyhow!("unsuppored op_type: Delete"));
    }
    Ok(())
}

Build

❯ cargo build --release --target wasm32-wasi -p example-wasm-rust-event-handler-lib
    Finished release [optimized] target(s) in 0.12s
❯ file ../../../target/wasm32-wasi/release/example_wasm_rust_event_handler_lib.wasm
../../../target/wasm32-wasi/release/example_wasm_rust_event_handler_lib.wasm: WebAssembly (wasm) binary module version 0x1 (MVP)

Once the .wasm file is built, you can deploy it to the trigger service