Sending blockchain actions

This functionality needs a host private key to be set in the W3bstream configuration​
An applet can send any blockchain action using the ws_send_tx function provided by W3nstream.
Send a transfer
The example below shows how to send a native token transfer from the W3bstream host account:
Rust
#[link(wasm_import_module = "env")] 
extern "C" { 
    fn ws_send_tx(ptr: *const u8, size: i32) -> i32;
}
​
#[no_mangle]
pub extern "C" fn start(event_id: i32) -> i32 {
 
  let tx = #r"{
              to: "0x46fF054D4275A4aB9d42179C3bcA59f938e658C8",
              value: "110",
              data: "",
            }"#,
    
    match unsafe { ws_send_tx(tx.as_ptr(), tx.len() as _) } {
        0 => Ok(()),
        _ => bail!("Error while sending the transaction"),
    }
}
Execute a contract function
It's also possible to use ws_send_tx to execute a smart contract function by encoding the call inside the transaction payload. The example below shows  an example:
#[link(wasm_import_module = "env")] 
extern "C" { 
    fn ws_send_tx(ptr: *const u8, size: i32) -> i32;
}
​
#[no_mangle]
pub extern "C" fn start(event_id: i32) -> i32 {
  let tx = 
    r#"{
       // The recipient is supposed to be a smart contract address
       "to": "0xb73eE6EB5b1984c78CCcC49eA7Ad773E71d74F51",
	"value": "0",
	// The payload encodes a smart contract function call
	"data": "40c10f190000000000000000000000000x4c123380CA640a146D803f844E0D9c90b52C5C970000000000000000000000000000000000000000000000000de0b6b3a7640000"
    }"#;
  
    unsafe { ws_send_tx(tx.as_ptr(), tx.len() as _) };
​
    return 0;
}

Last modified 4mo ago