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feat: Hook up mpt_issuance_id host function

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This commit is contained in:
TimothyBanks
2026-08-10 21:04:38 -04:00
parent 50623665c7
commit c1008c473c
11 changed files with 167 additions and 1 deletions
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12
crates/xrpl-host-functions/src/lib.rs
View File

@@ -316,6 +316,18 @@ host_functions! {
out: &mut [u8],
) -> HostResult<usize>;
/// The 32-byte keylet of an `MPTokenIssuance`, computed from the 20-byte issuer
/// account and its sequence number. `seq` is the guest's `u32` carried as its
/// `i32` bit pattern. Reads the account region and writes the keylet.
#[gas = 350]
#[wasm_name = "mpt_issuance_id"]
fn mptoken_issuance_keylet(
&self,
issuer: &[u8],
seq: i32,
out: &mut [u8],
) -> HostResult<usize>;
/// The XRPL `sha512Half` of `data`: the first [`HASH_LEN`] bytes of its SHA-512.
#[gas = 2000]
#[wasm_name = "sha512_half"]

23
crates/xrpl-host-functions/tests/generated_abi.rs
View File

@@ -283,6 +283,19 @@ impl HostFunctions for FakeHost {
put(out, &[account1[0]; HASH_LEN])
}
/// The issuer-and-sequence shape, for an `MPTokenIssuance`.
fn mptoken_issuance_keylet(
&self,
issuer: &[u8],
_seq: i32,
out: &mut [u8],
) -> HostResult<usize> {
if issuer.is_empty() {
return Err(HostError::InvalidAccount);
}
put(out, &[issuer[0]; HASH_LEN])
}
fn sha512_half(&self, data: &[u8], out: &mut [u8]) -> HostResult<usize> {
let mut digest = [0; HASH_LEN];
digest[0] = data.len() as u8;
@@ -435,6 +448,15 @@ fn the_trait_is_implementable() {
host.trust_line_keylet(&[7; 20], &[7; 20], &[1; 20], &mut out),
Err(HostError::InvalidParams)
);
assert_eq!(
host.mptoken_issuance_keylet(&[7; 20], 5, &mut out),
Ok(HASH_LEN)
);
assert_eq!(out[0], 7);
assert_eq!(
host.mptoken_issuance_keylet(&[], 5, &mut out),
Err(HostError::InvalidAccount)
);
assert_eq!(host.sha512_half(b"abc", &mut out), Ok(HASH_LEN));
assert_eq!(out[0], 3);
assert_eq!(host.trace("hello", b"xy", true), Ok(()));
@@ -530,6 +552,7 @@ fn the_spec_table_matches_the_declarations() {
("did_id", 350),
("escrow_id", 350),
("trustline_id", 400),
("mpt_issuance_id", 350),
("sha512_half", 2000),
("trace", 500),
("trace_num", 500),

18
crates/xrpl-wasm-vm-ffi/src/lib.rs
View File

@@ -318,6 +318,15 @@ mod ffi {
out: &mut [u8],
) -> i32;
#[namespace = "xrpl"]
#[cxx_name = "mptokenIssuanceKeylet"]
fn mptoken_issuance_keylet(
self: &HostContext,
issuer: &[u8],
seq: i32,
out: &mut [u8],
) -> i32;
#[namespace = "xrpl"]
#[cxx_name = "sha512Half"]
fn sha512_half(self: &HostContext, data: &[u8], out: &mut [u8]) -> i32;
@@ -529,6 +538,15 @@ impl HostFunctions for CxxHost<'_> {
)
}
fn mptoken_issuance_keylet(
&self,
issuer: &[u8],
seq: i32,
out: &mut [u8],
) -> HostResult<usize> {
bytes_written(self.ctx.mptoken_issuance_keylet(issuer, seq, out))
}
fn sha512_half(&self, data: &[u8], out: &mut [u8]) -> HostResult<usize> {
bytes_written(self.ctx.sha512_half(data, out))
}

8
crates/xrpl-wasm-vm/src/abi.rs
View File

@@ -314,6 +314,14 @@ mod tests {
) -> HostResult<usize> {
unreachable!("no unit test in this module calls the host")
}
fn mptoken_issuance_keylet(
&self,
_issuer: &[u8],
_seq: i32,
_out: &mut [u8],
) -> HostResult<usize> {
unreachable!("no unit test in this module calls the host")
}
fn sha512_half(&self, _data: &[u8], _out: &mut [u8]) -> HostResult<usize> {
unreachable!("no unit test in this module calls the host")
}

19
crates/xrpl-wasm-vm/src/register.rs
View File

@@ -523,6 +523,25 @@ pub(crate) fn register_host_functions(
})
},
),
HostFunctionSpec::MptokenIssuanceKeylet => linker.func_wrap(
HOST_MODULE,
op.wasm_name(),
|mut caller: Caller<'_, VmState<'_>>,
acc_ptr: i32,
acc_len: i32,
seq: i32,
out_ptr: i32,
out_len: i32|
-> Result<i32, wasmi::Error> {
charged(&mut caller, HostFunctionSpec::MptokenIssuanceKeylet, |c| {
let out = Region::new(out_ptr, out_len);
let issuer = Region::new(acc_ptr, acc_len);
write_buffered(c, out, |host, data, buf| {
host.mptoken_issuance_keylet(issuer.read(data)?, seq, buf)
})
})
},
),
HostFunctionSpec::Sha512Half => linker.func_wrap(
HOST_MODULE,
op.wasm_name(),

5
crates/xrpl-wasm-vm/tests/budgets.rs
View File

@@ -189,6 +189,11 @@ fn call_for(op: HostFunctionSpec) -> Call {
"(call $trustline_id (i32.const 0) (i32.const 20) (i32.const 20) (i32.const 20) (i32.const 40) (i32.const 20) (i32.const 60) (i32.const 32))",
8,
),
HostFunctionSpec::MptokenIssuanceKeylet => (
import::MPT_ISSUANCE_ID,
"(call $mpt_issuance_id (i32.const 0) (i32.const 20) (i32.const 5) (i32.const 32) (i32.const 32))",
5,
),
HostFunctionSpec::Sha512Half => (
import::SHA512_HALF,
"(call $sha512_half (i32.const 0) (i32.const 4) (i32.const 0) (i32.const 32))",

18
crates/xrpl-wasm-vm/tests/host_calls.rs
View File

@@ -571,6 +571,24 @@ fn trustline_id_reads_two_accounts_and_a_currency() {
);
}
/// The issuer-and-sequence keylet shape (like escrow), with its own answer set.
#[test]
fn mpt_issuance_id_reads_the_issuer_and_seq() {
let issuer = vec![0u8; 20];
let host = FakeHost::new().answering_mpt_issuance_keylet(
issuer.clone(),
5,
support::Answer::filler(32),
);
let wat = module(
&[import::MPT_ISSUANCE_ID, ONE_PAGE],
"(call $mpt_issuance_id (i32.const 0) (i32.const 20) (i32.const 5) (i32.const 64) (i32.const 64))",
);
assert_eq!(status(&wat, &host), 32, "the 32-byte keylet length");
assert_eq!(*host.mpt_issuance_keylets_asked.borrow(), vec![(issuer, 5)]);
}
/// A leading scalar parameter reaches the host as declared.
#[test]
fn home_le_field_passes_the_field_selector_through() {

3
crates/xrpl-wasm-vm/tests/preflight.rs
View File

@@ -98,7 +98,7 @@ fn a_disabled_feature_does_not_pass() {
/// Every host function the ABI declares, spelled as a guest imports it. The count
/// is asserted against the ABI so a function added to it cannot be left out here.
const ALL_IMPORTS: [&str; 31] = [
const ALL_IMPORTS: [&str; 32] = [
import::LDGR_INDEX,
import::PARENT_LDGR_TIME,
import::PARENT_LDGR_HASH,
@@ -127,6 +127,7 @@ const ALL_IMPORTS: [&str; 31] = [
import::DID_ID,
import::ESCROW_ID,
import::TRUSTLINE_ID,
import::MPT_ISSUANCE_ID,
import::SHA512_HALF,
import::TRACE,
import::TRACE_NUM,

34
crates/xrpl-wasm-vm/tests/support/mod.rs
View File

@@ -224,6 +224,11 @@ pub struct FakeHost {
pub trust_line_keylets: HashMap<(Vec<u8>, Vec<u8>, Vec<u8>), Answer>,
/// Every (account1, account2, currency) `trust_line_keylet` was asked for.
pub trust_line_keylets_asked: RefCell<Vec<(Vec<u8>, Vec<u8>, Vec<u8>)>>,
/// What `mptoken_issuance_keylet` answers, by (issuer bytes, seq). An unlisted key
/// answers `InvalidAccount`.
pub mpt_issuance_keylets: HashMap<(Vec<u8>, i32), Answer>,
/// Every (issuer, seq) `mptoken_issuance_keylet` was asked for.
pub mpt_issuance_keylets_asked: RefCell<Vec<(Vec<u8>, i32)>>,
/// What `sha512_half` answers, whatever it is given.
pub digest: Answer,
/// Every field selector `get_current_ledger_obj_field` was asked for.
@@ -296,6 +301,8 @@ impl Default for FakeHost {
escrow_keylets_asked: RefCell::new(Vec::new()),
trust_line_keylets: HashMap::new(),
trust_line_keylets_asked: RefCell::new(Vec::new()),
mpt_issuance_keylets: HashMap::new(),
mpt_issuance_keylets_asked: RefCell::new(Vec::new()),
digest: Answer::filler(32),
fields_asked: RefCell::new(Vec::new()),
digested: RefCell::new(Vec::new()),
@@ -499,6 +506,16 @@ impl FakeHost {
self
}
pub fn answering_mpt_issuance_keylet(
mut self,
issuer: Vec<u8>,
seq: i32,
answer: Answer,
) -> FakeHost {
self.mpt_issuance_keylets.insert((issuer, seq), answer);
self
}
pub fn answering_digest(mut self, answer: Answer) -> FakeHost {
self.digest = answer;
self
@@ -772,6 +789,22 @@ impl HostFunctions for FakeHost {
}
}
fn mptoken_issuance_keylet(
&self,
issuer: &[u8],
seq: i32,
out: &mut [u8],
) -> HostResult<usize> {
let key = (issuer.to_vec(), seq);
self.mpt_issuance_keylets_asked
.borrow_mut()
.push(key.clone());
match self.mpt_issuance_keylets.get(&key) {
Some(answer) => answer.fill(out),
None => Err(HostError::InvalidAccount),
}
}
fn sha512_half(&self, data: &[u8], out: &mut [u8]) -> HostResult<usize> {
self.digested.borrow_mut().push(data.to_vec());
self.digest.fill(out)
@@ -841,6 +874,7 @@ pub mod import {
r#"(import "host_lib" "did_id" (func $did_id (param i32 i32 i32 i32) (result i32)))"#;
pub const ESCROW_ID: &str = r#"(import "host_lib" "escrow_id" (func $escrow_id (param i32 i32 i32 i32 i32) (result i32)))"#;
pub const TRUSTLINE_ID: &str = r#"(import "host_lib" "trustline_id" (func $trustline_id (param i32 i32 i32 i32 i32 i32 i32 i32) (result i32)))"#;
pub const MPT_ISSUANCE_ID: &str = r#"(import "host_lib" "mpt_issuance_id" (func $mpt_issuance_id (param i32 i32 i32 i32 i32) (result i32)))"#;
pub const SHA512_HALF: &str = r#"(import "host_lib" "sha512_half" (func $sha512_half (param i32 i32 i32 i32) (result i32)))"#;
pub const TRACE: &str =
r#"(import "host_lib" "trace" (func $trace (param i32 i32 i32 i32 i32) (result i32)))"#;

8
include/xrpl/tx/wasm/HostContext.h
View File

@@ -186,6 +186,14 @@ public:
rust::Slice<std::uint8_t const> currency,
rust::Slice<std::uint8_t> out) const noexcept;
// The issuer id must be 20 bytes, else `InvalidParams`. `seq` carries the guest's
// u32 as its i32 bit pattern. Writes the 32-byte keylet.
[[nodiscard]] std::int32_t
mptokenIssuanceKeylet(
rust::Slice<std::uint8_t const> issuer,
std::int32_t seq,
rust::Slice<std::uint8_t> out) const noexcept;
[[nodiscard]] std::int32_t
sha512Half(rust::Slice<std::uint8_t const> data, rust::Slice<std::uint8_t> out) const noexcept;

20
src/libxrpl/tx/wasm/HostContext.cpp
View File

@@ -624,6 +624,26 @@ HostContext::trustLineKeylet(
});
}
std::int32_t
HostContext::mptokenIssuanceKeylet(
rust::Slice<std::uint8_t const> issuer,
std::int32_t seq,
rust::Slice<std::uint8_t> out) const noexcept
{
return guarded(hostFunctions_.getJournal(), kHostInternal, [&] {
if (issuer.size() != AccountID::size())
return hfErrorToInt(HostFunctionError::InvalidParams);
// The guest's u32 seq arrives as its i32 bit pattern; recover it.
auto const value = hostFunctions_.mptokenIssuanceKeylet(
AccountID::fromVoid(issuer.data()), static_cast<std::uint32_t>(seq));
if (!value)
return hfErrorToInt(value.error());
return answer(out, value->data(), value->size());
});
}
std::int32_t
HostContext::sha512Half(rust::Slice<std::uint8_t const> data, rust::Slice<std::uint8_t> out)
const noexcept