Function promise_then

pub fn promise_then(
    promise_idx: PromiseIndex,
    account_id: AccountId,
    function_name: &str,
    arguments: &[u8],
    amount: NearToken,
    gas: Gas,
) -> PromiseIndex

Attaches the callback (which is a near_primitives::action::FunctionCallAction) that is executed after promise pointed by promise_idx is complete.

Examples

use near_sdk::env::{promise_create, promise_then};
use near_sdk::serde_json;
use near_sdk::{AccountId, NearToken, Gas};
use std::str::FromStr;

let promise = promise_create(
    "counter.near".parse().unwrap(),
    "increment",
    serde_json::json!({
        "value": 5        
    }).to_string().into_bytes().as_slice(),
    NearToken::from_yoctonear(0),
    Gas::from_tgas(30)
);

let chained_promise = promise_then(
    promise,
    "greetings.near".parse().unwrap(),
    "set_greeting",
    serde_json::json!({
        "text": "Hello World"
    }).to_string().into_bytes().as_slice(),
    NearToken::from_yoctonear(4000000000000),
    Gas::from_tgas(30)
);

More low-level info here: near_vm_runner::logic::VMLogic::promise_then Example usages of this low-level api are https://github.com/near/near-sdk-rs/tree/master/examples/factory-contract/low-level/src/lib.rs and https://github.com/near/near-sdk-rs/blob/master/examples/cross-contract-calls/low-level/src/lib.rs