miden_testing/tx_context/
mock_transaction_builder.rs

1// MOCK TRANSACTION BUILDER
2// ================================================================================================
3
4use alloc::collections::BTreeMap;
5use alloc::sync::Arc;
6use alloc::vec::Vec;
7
8use anyhow::Context;
9use miden_processor::advice::AdviceInputs;
10use miden_processor::{Felt, Word};
11use miden_protocol::EMPTY_WORD;
12use miden_protocol::account::auth::{PublicKeyCommitment, Signature};
13use miden_protocol::account::{Account, AccountId};
14use miden_protocol::assembly::DefaultSourceManager;
15use miden_protocol::assembly::debuginfo::SourceManagerSync;
16use miden_protocol::block::BlockNumber;
17use miden_protocol::block::account_tree::AccountWitness;
18use miden_protocol::note::{Note, NoteId, NoteScript, NoteScriptRoot};
19use miden_protocol::transaction::{RawOutputNote, TransactionArgs, TransactionScript};
20use miden_tx::TransactionMastStore;
21use miden_tx::auth::BasicAuthenticator;
22
23use super::TransactionContext;
24use crate::MockChain;
25use crate::mock_chain::TxContextInput;
26
27// MOCK TRANSACTION BUILDER
28// ================================================================================================
29
30/// A builder for a [`TransactionContext`] that is coupled to a concrete [`MockChain`].
31///
32/// It is the public entry point for executing a transaction against a chain and is created through
33/// [`MockChain::build_transaction`]. Contrary to [`MockChain::build_tx_context`], input notes are
34/// not passed up front but added explicitly through [`Self::authenticated_input_note`] and
35/// [`Self::unauthenticated_input_note`]. The transaction inputs are only resolved against the chain
36/// in [`Self::build`], once all input notes are known, by calling
37/// [`MockChain::get_transaction_inputs`].
38///
39/// # Examples
40///
41/// ```
42/// # use anyhow::Result;
43/// # use miden_protocol::{asset::FungibleAsset, note::NoteType};
44/// # use miden_testing::{Auth, MockChain};
45/// #
46/// # #[tokio::main(flavor = "current_thread")]
47/// # async fn main() -> Result<()> {
48/// let mut builder = MockChain::builder();
49/// let sender = builder.add_existing_mock_account(Auth::IncrNonce)?;
50/// let account = builder.add_existing_mock_account(Auth::IncrNonce)?;
51/// let note = builder.add_p2id_note(
52///     sender.id(),
53///     account.id(),
54///     &[FungibleAsset::mock(100)],
55///     NoteType::Public,
56/// )?;
57/// let chain = builder.build()?;
58///
59/// let executed = chain
60///     .build_transaction(account.id())
61///     .authenticated_input_note(note.id())
62///     .build()?
63///     .execute()
64///     .await?;
65///
66/// assert_eq!(executed.input_notes().num_notes(), 1);
67/// # Ok(())
68/// # }
69/// ```
70#[derive(Clone)]
71pub struct MockTransactionBuilder<'chain> {
72    chain: &'chain MockChain,
73    input: TxContextInput,
74    reference_block: Option<BlockNumber>,
75    authenticated_notes: Vec<NoteId>,
76    unauthenticated_notes: Vec<Note>,
77    authenticator: Option<BasicAuthenticator>,
78    advice_inputs: AdviceInputs,
79    foreign_account_inputs: BTreeMap<AccountId, (Account, AccountWitness)>,
80    expected_output_notes: Vec<Note>,
81    tx_script: Option<TransactionScript>,
82    tx_script_args: Word,
83    auth_args: Word,
84    note_args: BTreeMap<NoteId, Word>,
85    signatures: Vec<(PublicKeyCommitment, Word, Signature)>,
86    note_scripts: BTreeMap<NoteScriptRoot, NoteScript>,
87    source_manager: Option<Arc<dyn SourceManagerSync>>,
88    is_lazy_loading_enabled: bool,
89}
90
91impl<'chain> MockTransactionBuilder<'chain> {
92    /// Creates a new [`MockTransactionBuilder`] against the provided chain.
93    ///
94    /// Use [`MockChain::build_transaction`] instead of calling this directly.
95    pub(crate) fn new(chain: &'chain MockChain, input: impl Into<TxContextInput>) -> Self {
96        let input = input.into();
97        // Resolve the chain's authenticator for the account up front. The chain is borrowed
98        // immutably for the builder's lifetime, so this default cannot change before `build`; an
99        // explicit `authenticator` call may still override it.
100        let authenticator = chain.account_authenticator(input.id());
101
102        Self {
103            chain,
104            input,
105            reference_block: None,
106            authenticated_notes: Vec::new(),
107            unauthenticated_notes: Vec::new(),
108            authenticator,
109            advice_inputs: AdviceInputs::default(),
110            foreign_account_inputs: BTreeMap::new(),
111            expected_output_notes: Vec::new(),
112            tx_script: None,
113            tx_script_args: EMPTY_WORD,
114            auth_args: EMPTY_WORD,
115            note_args: BTreeMap::new(),
116            signatures: Vec::new(),
117            note_scripts: BTreeMap::new(),
118            source_manager: None,
119            is_lazy_loading_enabled: true,
120        }
121    }
122
123    /// Adds an authenticated input note that the transaction consumes.
124    ///
125    /// The note must already be committed to the chain so that its inclusion proof can be resolved
126    /// in [`Self::build`].
127    pub fn authenticated_input_note(mut self, note_id: NoteId) -> Self {
128        self.authenticated_notes.push(note_id);
129        self
130    }
131
132    /// Adds multiple authenticated input notes that the transaction consumes.
133    ///
134    /// This is the iterator equivalent of [`Self::authenticated_input_note`].
135    pub fn authenticated_input_notes(mut self, note_ids: impl IntoIterator<Item = NoteId>) -> Self {
136        self.authenticated_notes.extend(note_ids);
137        self
138    }
139
140    /// Adds an unauthenticated input note that the transaction consumes.
141    ///
142    /// Contrary to [`Self::authenticated_input_note`], the note does not need to be committed to
143    /// the chain.
144    pub fn unauthenticated_input_note(mut self, note: Note) -> Self {
145        self.unauthenticated_notes.push(note);
146        self
147    }
148
149    /// Adds multiple unauthenticated input notes that the transaction consumes.
150    ///
151    /// This is the iterator equivalent of [`Self::unauthenticated_input_note`].
152    pub fn unauthenticated_input_notes(mut self, notes: impl IntoIterator<Item = Note>) -> Self {
153        self.unauthenticated_notes.extend(notes);
154        self
155    }
156
157    /// Sets the block the transaction executes against.
158    ///
159    /// By default the transaction is built against the chain's latest block. Use this to execute
160    /// against an earlier block instead, e.g. to test block-height-dependent script logic such as
161    /// timelocks or note expiration. All input notes must have been created at or before this
162    /// block.
163    pub fn reference_block(mut self, reference_block: impl Into<BlockNumber>) -> Self {
164        self.reference_block = Some(reference_block.into());
165        self
166    }
167
168    /// Set the authenticator for the transaction (if needed).
169    pub fn authenticator(mut self, authenticator: Option<BasicAuthenticator>) -> Self {
170        self.authenticator = authenticator;
171        self
172    }
173
174    /// Extends the advice inputs with the provided [`AdviceInputs`] instance.
175    pub fn extend_advice_inputs(mut self, advice_inputs: AdviceInputs) -> Self {
176        self.advice_inputs.extend(advice_inputs);
177        self
178    }
179
180    /// Inserts a single key-value pair into the advice inputs map.
181    ///
182    /// To add multiple entries, call this repeatedly or use [`Self::extend_advice_inputs`].
183    pub fn extend_advice_map(mut self, key: Word, value: Vec<Felt>) -> Self {
184        self.advice_inputs.map.insert(key, value);
185        self
186    }
187
188    /// Sets foreign account inputs that are used by the transaction.
189    pub fn foreign_accounts(
190        mut self,
191        inputs: impl IntoIterator<Item = (Account, AccountWitness)>,
192    ) -> Self {
193        self.foreign_account_inputs.extend(
194            inputs.into_iter().map(|(account, witness)| (account.id(), (account, witness))),
195        );
196        self
197    }
198
199    /// Sets the desired transaction script.
200    pub fn tx_script(mut self, tx_script: TransactionScript) -> Self {
201        self.tx_script = Some(tx_script);
202        self
203    }
204
205    /// Sets the transaction script arguments.
206    pub fn tx_script_args(mut self, tx_script_args: Word) -> Self {
207        self.tx_script_args = tx_script_args;
208        self
209    }
210
211    /// Sets the desired auth arguments.
212    pub fn auth_args(mut self, auth_args: Word) -> Self {
213        self.auth_args = auth_args;
214        self
215    }
216
217    /// Extends the note arguments map with the provided one.
218    pub fn extend_note_args(mut self, note_args: BTreeMap<NoteId, Word>) -> Self {
219        self.note_args.extend(note_args);
220        self
221    }
222
223    /// Adds a single expected output note.
224    ///
225    /// A [`RawOutputNote::Partial`] note is ignored, since it does not carry the recipient details
226    /// required to reconstruct the note.
227    pub fn expected_output_note(mut self, output_note: RawOutputNote) -> Self {
228        if let RawOutputNote::Full(note) = output_note {
229            self.expected_output_notes.push(note);
230        }
231        self
232    }
233
234    /// Extends the expected output notes.
235    ///
236    /// This is the iterator equivalent of [`Self::expected_output_note`].
237    pub fn expected_output_notes(mut self, output_notes: Vec<RawOutputNote>) -> Self {
238        let output_notes = output_notes.into_iter().filter_map(|note| match note {
239            RawOutputNote::Full(note) => Some(note),
240            RawOutputNote::Partial(_) => None,
241        });
242        self.expected_output_notes.extend(output_notes);
243        self
244    }
245
246    /// Adds a new signature for the message and the public key.
247    pub fn add_signature(
248        mut self,
249        pub_key: PublicKeyCommitment,
250        message: Word,
251        signature: Signature,
252    ) -> Self {
253        self.signatures.push((pub_key, message, signature));
254        self
255    }
256
257    /// Adds a note script to the context for testing.
258    pub fn add_note_script(mut self, script: NoteScript) -> Self {
259        self.note_scripts.insert(script.root(), script);
260        self
261    }
262
263    /// Sets the [`SourceManagerSync`] on the [`TransactionContext`] that will be built.
264    ///
265    /// This source manager should contain the sources of all involved scripts and account code in
266    /// order to provide better error messages if an error occurs.
267    pub fn with_source_manager(mut self, source_manager: Arc<dyn SourceManagerSync>) -> Self {
268        self.source_manager = Some(source_manager);
269        self
270    }
271
272    /// Disables lazy loading.
273    ///
274    /// Only affects [`TransactionContext::execute_code`] and causes the host to _not_ handle lazy
275    /// loading events.
276    pub fn disable_lazy_loading(mut self) -> Self {
277        self.is_lazy_loading_enabled = false;
278        self
279    }
280
281    /// Builds the [`TransactionContext`].
282    ///
283    /// The configured account and input notes are resolved into [`TransactionInputs`] against the
284    /// [`Self::reference_block`] (defaulting to the chain's latest block) through
285    /// [`MockChain::get_transaction_inputs`], and the remaining configuration is assembled into the
286    /// [`TransactionContext`].
287    ///
288    /// [`TransactionInputs`]: miden_protocol::transaction::TransactionInputs
289    pub fn build(self) -> anyhow::Result<TransactionContext> {
290        let account = self.chain.resolve_tx_account(self.input)?;
291
292        let mut tx_inputs = match self.reference_block {
293            Some(reference_block) => {
294                let latest_block = self.chain.latest_block_header().block_num();
295                anyhow::ensure!(
296                    reference_block <= latest_block,
297                    "reference block {reference_block} is out of range (latest {latest_block})",
298                );
299
300                self.chain.get_transaction_inputs_at(
301                    reference_block,
302                    &account,
303                    &self.authenticated_notes,
304                    &self.unauthenticated_notes,
305                )
306            },
307            None => self.chain.get_transaction_inputs(
308                &account,
309                &self.authenticated_notes,
310                &self.unauthenticated_notes,
311            ),
312        }
313        .context("failed to resolve transaction inputs from mock chain")?;
314
315        let mut tx_args = TransactionArgs::default().with_note_args(self.note_args);
316        if let Some(tx_script) = self.tx_script {
317            tx_args = tx_args.with_tx_script_and_args(tx_script, self.tx_script_args);
318        }
319        tx_args = tx_args.with_auth_args(self.auth_args);
320        tx_args.extend_advice_inputs(self.advice_inputs);
321        tx_args.extend_output_note_recipients(&self.expected_output_notes);
322        for (public_key_commitment, message, signature) in self.signatures {
323            tx_args.add_signature(public_key_commitment, message, signature);
324        }
325        tx_inputs.set_tx_args(tx_args);
326
327        let mast_store = TransactionMastStore::new();
328        mast_store.load_account_code(tx_inputs.account().code());
329        for (account, _) in self.foreign_account_inputs.values() {
330            mast_store.insert(account.code().mast());
331        }
332
333        let source_manager =
334            self.source_manager.unwrap_or_else(|| Arc::new(DefaultSourceManager::default()));
335
336        Ok(TransactionContext {
337            account,
338            expected_output_notes: self.expected_output_notes,
339            foreign_account_inputs: self.foreign_account_inputs,
340            tx_inputs,
341            mast_store,
342            authenticator: self.authenticator,
343            source_manager,
344            note_scripts: self.note_scripts,
345            is_lazy_loading_enabled: self.is_lazy_loading_enabled,
346        })
347    }
348}
miden_testing/tx_context/mock_transaction_builder.rs

miden_testing/tx_context/
mock_transaction_builder.rs
