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Adding low-level way to make XCC #2365

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Dec 11, 2024
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Adding low-level way to make XCC #2365

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added low-level way to make xcc (#2364)
garikbesson Dec 11, 2024
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garikbesson Dec 11, 2024
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65 changes: 51 additions & 14 deletions docs/2.build/2.smart-contracts/anatomy/crosscontract.md
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Original file line number Diff line number Diff line change
Expand Up @@ -40,10 +40,16 @@ While making your contract, it is likely that you will want to query information
<Language value="rust" language="rust">
<Github fname="lib.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/lib.rs"
start="22" end="51" />
<Github fname="external.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/external.rs"
start="2" end="12" />
start="1" end="29" />
<Github fname="external_contract.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/external_contract.rs"
start="1" end="8" />
<Github fname="high_level.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/high_level.rs"
start="8" end="37" />
<Github fname="low_level.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/low_level.rs"
start="7" end="39" />

</Language>

Expand All @@ -65,10 +71,16 @@ Calling another contract passing information is also a common scenario. Below yo
<Language value="rust" language="rust">
<Github fname="lib.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/lib.rs"
start="53" end="80" />
<Github fname="external.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/external.rs"
start="2" end="12" />
start="1" end="29" />
<Github fname="external_contract.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/external_contract.rs"
start="1" end="8" />
<Github fname="high_level.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/high_level.rs"
start="39" end="66" />
<Github fname="low_level.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/low_level.rs"
start="41" end="72" />

</Language>

Expand Down Expand Up @@ -117,7 +129,7 @@ To create a cross-contract call with a callback, create two promises and use the
</TabItem>
<TabItem value="rs" label="🦀 Rust">

There is a helper macro that allows you to make cross-contract calls with the syntax `#[ext_contract(...)]`. It takes a Rust Trait and converts it to a module with static methods. Each of these static methods takes positional arguments defined by the Trait, then the `receiver_id`, the attached deposit and the amount of gas and returns a new `Promise`.
There is a helper macro that allows you to make cross-contract calls with the syntax `#[ext_contract(...)]`. It takes a Rust Trait and converts it to a module with static methods. Each of these static methods takes positional arguments defined by the Trait, then the `receiver_id`, the attached deposit and the amount of gas and returns a new `Promise`. *That's the high-level way to make cross-contract calls.*

```rust
#[ext_contract(external_trait)]
Expand All @@ -139,6 +151,31 @@ To create a cross-contract call with a callback, create two promises and use the

```

<hr class="subsection" />

There is another way to achieve the same result. You can create a new `Promise` without using a helper macro. *It's the low-level way to make cross-contract calls.*

```rust
let arguments = json!({ "foo": "bar" })
.to_string()
.into_bytes();

let promise = Promise::new("external_address").function_call(
"function_name".to_owned(),
arguments,
DEPOSIT,
GAS
);

promise.then(
// Create a promise to callback query_greeting_callback
Self::ext(env::current_account_id())
.with_static_gas(GAS)
.callback_name(),
);

```

<details>
<summary> Gas </summary>

Expand Down Expand Up @@ -179,9 +216,9 @@ In the callback function you will have access to the result, which will contain

<Language value="rust" language="rust">

<Github fname="lib.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/lib.rs"
start="37" end="51" />
<Github fname="high_level.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-simple-rs/src/high_level.rs"
start="23" end="37" />

</Language>

Expand Down Expand Up @@ -247,14 +284,14 @@ An important property of batch calls is that they **act as a unit**: they execut

<Github fname="batch_actions" language="js"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-advanced-ts/src/internal/batch_actions.ts"
start="7" end="17" />
start="5" end="17" />

</TabItem>
<TabItem value="rs" label="🦀 Rust">

<Github fname="lib.ts" language="rust"
url="https://github.com/near-examples/cross-contract-calls/blob/main/contract-advanced-rs/src/batch_actions.rs"
start="14" end="19" />
start="8" end="20" />

</TabItem>
</Tabs>
Expand Down
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