feat: implement circuit for no results in chunck

verifiable-db/src/results_tree/extraction/mod.rs

@@ -4,6 +4,7 @@ use public_inputs::PublicInputs;
 pub(crate) mod child_included_single_path_node;
 pub(crate) mod full_node;
 pub(crate) mod no_child_included_single_path_node;
+pub(crate) mod no_results_in_chunk;
 pub(crate) mod partial_node;
 pub(crate) mod public_inputs;
 pub(crate) mod record;

verifiable-db/src/results_tree/extraction/no_results_in_chunk.rs

@@ -0,0 +1,191 @@
+use crate::results_tree::extraction::PublicInputs;
+use alloy::primitives::U256;
+use mp2_common::{
+    public_inputs::PublicInputCommon,
+    serialization::{deserialize, serialize},
+    types::CBuilder,
+    u256::CircuitBuilderU256,
+    utils::{greater_than, ToTargets},
+    D, F,
+};
+use plonky2::{
+    hash::hash_types::{HashOut, HashOutTarget},
+    iop::{
+        target::Target,
+        witness::{PartialWitness, WitnessWrite},
+    },
+    plonk::proof::ProofWithPublicInputsTarget,
+};
+use plonky2_ecgfp5::gadgets::curve::CircuitBuilderEcGFp5;
+use recursion_framework::circuit_builder::CircuitLogicWires;
+use serde::{Deserialize, Serialize};
+use std::iter;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct NoResultsInChunkWires {
+    num_records: Target,
+    #[serde(serialize_with = "serialize", deserialize_with = "deserialize")]
+    results_tree_hash: HashOutTarget,
+    offset_range_min: Target,
+    offset_range_max: Target,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct NoResultsInChunkCircuit {
+    /// Number of records in the results tree
+    pub(crate) num_records: F,
+    /// Hash of the results tree
+    pub(crate) results_tree_hash: HashOut<F>,
+    /// Minimum offset range bound
+    pub(crate) offset_range_min: F,
+    /// Maximum offset range bound
+    pub(crate) offset_range_max: F,
+}
+
+impl NoResultsInChunkCircuit {
+    pub fn build(b: &mut CBuilder) -> NoResultsInChunkWires {
+        let zero_u256 = b.zero_u256();
+        let curve_zero = b.curve_zero();
+        let one = b.one();
+        let ttrue = b._true();
+
+        let num_records = b.add_virtual_target();
+        let results_tree_hash = b.add_virtual_hash();
+        let [offset_range_min, offset_range_max] = b.add_virtual_target_arr();
+
+        // Ensure that the query is asking to retrieve results with an offset
+        // being greater than the overall number of results
+        let is_greater = greater_than(b, offset_range_min, num_records, 32);
+        b.connect(is_greater.target, ttrue.target);
+
+        // Register the public inputs.
+        PublicInputs::new(
+            &results_tree_hash.to_targets(),
+            &zero_u256.to_targets(),
+            &zero_u256.to_targets(),
+            &zero_u256.to_targets(),
+            &[one; 2],
+            &[one],
+            &[num_records],
+            &[offset_range_min],
+            &[offset_range_max],
+            &curve_zero.to_targets(),
+        )
+        .register(b);
+
+        NoResultsInChunkWires {
+            num_records,
+            results_tree_hash,
+            offset_range_min,
+            offset_range_max,
+        }
+    }
+
+    fn assign(&self, pw: &mut PartialWitness<F>, wires: &NoResultsInChunkWires) {
+        pw.set_target(wires.num_records, self.num_records);
+        pw.set_hash_target(wires.results_tree_hash, self.results_tree_hash);
+        pw.set_target(wires.offset_range_min, self.offset_range_min);
+        pw.set_target(wires.offset_range_max, self.offset_range_max);
+    }
+}
+
+/// Verified proof number = 0
+pub(crate) const NUM_VERIFIED_PROOFS: usize = 0;
+
+impl CircuitLogicWires<F, D, NUM_VERIFIED_PROOFS> for NoResultsInChunkWires {
+    type CircuitBuilderParams = ();
+    type Inputs = NoResultsInChunkCircuit;
+
+    const NUM_PUBLIC_INPUTS: usize = PublicInputs::<F>::total_len();
+
+    fn circuit_logic(
+        builder: &mut CBuilder,
+        _verified_proofs: [&ProofWithPublicInputsTarget<D>; NUM_VERIFIED_PROOFS],
+        _builder_parameters: Self::CircuitBuilderParams,
+    ) -> Self {
+        Self::Inputs::build(builder)
+    }
+
+    fn assign_input(&self, inputs: Self::Inputs, pw: &mut PartialWitness<F>) -> anyhow::Result<()> {
+        inputs.assign(pw, self);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use mp2_common::C;
+    use mp2_test::{
+        circuit::{run_circuit, UserCircuit},
+        utils::gen_random_field_hash,
+    };
+    use plonky2::field::types::Field;
+    use plonky2_ecgfp5::curve::curve::WeierstrassPoint;
+    use rand::{thread_rng, Rng};
+
+    impl UserCircuit<F, D> for NoResultsInChunkCircuit {
+        type Wires = NoResultsInChunkWires;
+
+        fn build(b: &mut CBuilder) -> Self::Wires {
+            NoResultsInChunkCircuit::build(b)
+        }
+
+        fn prove(&self, pw: &mut PartialWitness<F>, wires: &Self::Wires) {
+            self.assign(pw, wires);
+        }
+    }
+
+    #[test]
+    fn test_no_results_in_chunk_circuit() {
+        // Construct the witness.
+        let mut rng = thread_rng();
+        let num_records = F::from_canonical_u32(rng.gen());
+        let results_tree_hash = gen_random_field_hash();
+        let offset_range_min = num_records + F::ONE;
+        let offset_range_max = offset_range_min + F::from_canonical_u32(rng.gen());
+
+        // Construct the circuit.
+        let test_circuit = NoResultsInChunkCircuit {
+            num_records,
+            results_tree_hash,
+            offset_range_min,
+            offset_range_max,
+        };
+
+        // Proof for the test circuit.
+        let proof = run_circuit::<F, D, C, _>(test_circuit);
+        let pi = PublicInputs::from_slice(&proof.public_inputs);
+
+        // Check the public inputs.
+        // Tree hash
+        assert_eq!(pi.tree_hash(), results_tree_hash);
+
+        // Min value
+        assert_eq!(pi.min_value(), U256::ZERO);
+
+        // Max value
+        assert_eq!(pi.max_value(), U256::ZERO);
+
+        // Primary index value
+        assert_eq!(pi.primary_index_value(), U256::ZERO);
+
+        // Index ids
+        assert_eq!(pi.index_ids(), [F::ONE; 2]);
+
+        // Min counter
+        assert_eq!(pi.min_counter(), F::ONE);
+
+        // Max counter
+        assert_eq!(pi.max_counter(), num_records);
+
+        // Offset range min
+        assert_eq!(pi.offset_range_min(), offset_range_min);
+
+        // Offset range max
+        assert_eq!(pi.offset_range_max(), offset_range_max);
+
+        // Accumulator
+        assert_eq!(pi.accumulator(), WeierstrassPoint::NEUTRAL);
+    }
+}