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Adding low-level way to make XCC #2199

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Adding low-level way to make XCC #2199

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02b8e09
added low-level way to make xcc
garikbesson Aug 7, 2024
66fa47b
Merge branch 'master' into xcc-level-updates
garikbesson Aug 7, 2024
f62f267
Merge branch 'master' into xcc-level-updates
gagdiez Sep 19, 2024
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59 changes: 48 additions & 11 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 @@ -39,11 +39,17 @@ 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" />
url="https://github.com/near-examples/cross-contract-calls/blob/high-low-level-examples/contract-simple-rs/src/lib.rs"
start="1" end="29" />
<Github fname="external_contract.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/high-low-level-examples/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/high-low-level-examples/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/high-low-level-examples/contract-simple-rs/src/low_level.rs"
start="7" end="39" />

</Language>

Expand All @@ -64,11 +70,17 @@ 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" />
url="https://github.com/near-examples/cross-contract-calls/blob/high-low-level-examples/contract-simple-rs/src/lib.rs"
start="1" end="29" />
<Github fname="external_contract.rs"
url="https://github.com/near-examples/cross-contract-calls/blob/high-low-level-examples/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/high-low-level-examples/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/high-low-level-examples/contract-simple-rs/src/low_level.rs"
start="41" end="74" />

</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
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