1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69

use super::ArwenBigUint;
use crate::ArwenApiImpl;
use elrond_wasm::api::CallValueApi;
use elrond_wasm::types::{BoxedBytes, EsdtTokenType, TokenIdentifier};

const MAX_POSSIBLE_TOKEN_IDENTIFIER_LENGTH: usize = 32;

extern "C" {
	fn checkNoPayment();

	fn bigIntNew(value: i64) -> i32;

	fn bigIntGetCallValue(dest: i32);
	fn bigIntGetESDTCallValue(dest: i32);
	fn getESDTTokenName(resultOffset: *const u8) -> i32;
	fn getESDTTokenNonce() -> u64;
	fn getESDTTokenType() -> i32;

	/// TODO: decide if it is worth using or not
	#[allow(dead_code)]
	fn getCallValueTokenName(callValueOffset: *const u8, resultOffset: *const u8) -> i32;
}

impl CallValueApi for ArwenApiImpl {
	type AmountType = ArwenBigUint;

	#[inline]
	fn check_not_payable(&self) {
		unsafe {
			checkNoPayment();
		}
	}

	fn egld_value(&self) -> ArwenBigUint {
		unsafe {
			let result = bigIntNew(0);
			bigIntGetCallValue(result);
			ArwenBigUint { handle: result }
		}
	}

	fn esdt_value(&self) -> ArwenBigUint {
		unsafe {
			let result = bigIntNew(0);
			bigIntGetESDTCallValue(result);
			ArwenBigUint { handle: result }
		}
	}

	fn token(&self) -> TokenIdentifier {
		unsafe {
			let mut name_buffer = [0u8; MAX_POSSIBLE_TOKEN_IDENTIFIER_LENGTH];
			let name_len = getESDTTokenName(name_buffer.as_mut_ptr());
			if name_len == 0 {
				TokenIdentifier::egld()
			} else {
				BoxedBytes::from(&name_buffer[..name_len as usize]).into()
			}
		}
	}

	fn esdt_token_nonce(&self) -> u64 {
		unsafe { getESDTTokenNonce() }
	}

	fn esdt_token_type(&self) -> EsdtTokenType {
		unsafe { (getESDTTokenType() as u8).into() }
	}
}