Cursed Inscriptions [1/n]

src/index/entry.rs

@@ -22,15 +22,16 @@ impl Entry for BlockHash {
   }
 }
 
+#[derive(Debug)]
 pub(crate) struct InscriptionEntry {
   pub(crate) fee: u64,
   pub(crate) height: u64,
-  pub(crate) number: u64,
+  pub(crate) number: i64,
   pub(crate) sat: Option<Sat>,
   pub(crate) timestamp: u32,
 }
 
-pub(crate) type InscriptionEntryValue = (u64, u64, u64, u64, u32);
+pub(crate) type InscriptionEntryValue = (u64, u64, i64, u64, u32);
 
 impl Entry for InscriptionEntry {
   type Value = InscriptionEntryValue;

src/index/updater/inscription_updater.rs

@@ -1,14 +1,22 @@
-use super::*;
+use {super::*, std::collections::BTreeSet};
 
+#[derive(Debug, Clone)]
 pub(super) struct Flotsam {
   inscription_id: InscriptionId,
   offset: u64,
   origin: Origin,
 }
 
+#[derive(Debug, Clone)]
 enum Origin {
-  New { fee: u64 },
-  Old { old_satpoint: SatPoint },
+  New {
+    fee: u64,
+    cursed: bool,
+    unbound: bool,
+  },
+  Old {
+    old_satpoint: SatPoint,
+  },
 }
 
 pub(super) struct InscriptionUpdater<'a, 'db, 'tx> {
@@ -18,8 +26,9 @@ pub(super) struct InscriptionUpdater<'a, 'db, 'tx> {
   value_receiver: &'a mut Receiver<u64>,
   id_to_entry: &'a mut Table<'db, 'tx, &'static InscriptionIdValue, InscriptionEntryValue>,
   pub(super) lost_sats: u64,
-  next_number: u64,
-  number_to_id: &'a mut Table<'db, 'tx, u64, &'static InscriptionIdValue>,
+  next_cursed_number: i64,
+  next_number: i64,
+  number_to_id: &'a mut Table<'db, 'tx, i64, &'static InscriptionIdValue>,
   outpoint_to_value: &'a mut Table<'db, 'tx, &'static OutPointValue, u64>,
   reward: u64,
   sat_to_inscription_id: &'a mut Table<'db, 'tx, u64, &'static InscriptionIdValue>,
@@ -36,14 +45,20 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
     value_receiver: &'a mut Receiver<u64>,
     id_to_entry: &'a mut Table<'db, 'tx, &'static InscriptionIdValue, InscriptionEntryValue>,
     lost_sats: u64,
-    number_to_id: &'a mut Table<'db, 'tx, u64, &'static InscriptionIdValue>,
+    number_to_id: &'a mut Table<'db, 'tx, i64, &'static InscriptionIdValue>,
     outpoint_to_value: &'a mut Table<'db, 'tx, &'static OutPointValue, u64>,
     sat_to_inscription_id: &'a mut Table<'db, 'tx, u64, &'static InscriptionIdValue>,
     satpoint_to_id: &'a mut Table<'db, 'tx, &'static SatPointValue, &'static InscriptionIdValue>,
     timestamp: u32,
     unbound_inscriptions: u64,
     value_cache: &'a mut HashMap<OutPoint, u64>,
   ) -> Result<Self> {
+    let next_cursed_number = number_to_id
+      .iter()?
+      .map(|(number, _id)| number.value() - 1)
+      .next()
+      .unwrap_or(-1);
+
     let next_number = number_to_id
       .iter()?
       .rev()
@@ -58,6 +73,7 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
       value_receiver,
       id_to_entry,
       lost_sats,
+      next_cursed_number,
       next_number,
       number_to_id,
       outpoint_to_value,
@@ -76,66 +92,117 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
     txid: Txid,
     input_sat_ranges: Option<&VecDeque<(u64, u64)>>,
   ) -> Result {
-    let mut inscriptions = Vec::new();
-
+    let mut new_inscriptions = Inscription::from_transaction(tx).into_iter().peekable();
+    let mut floating_inscriptions = Vec::new();
+    let mut inscribed_offsets = BTreeSet::new();
     let mut input_value = 0;
-    for tx_in in &tx.input {
+    let mut id_counter = 0;
+
+    for (input_index, tx_in) in tx.input.iter().enumerate() {
+      // skip subsidy since no inscriptions possible
       if tx_in.previous_output.is_null() {
         input_value += Height(self.height).subsidy();
-      } else {
-        for (old_satpoint, inscription_id) in
-          Index::inscriptions_on_output(self.satpoint_to_id, tx_in.previous_output)?
-        {
-          inscriptions.push(Flotsam {
-            offset: input_value + old_satpoint.offset,
-            inscription_id,
-            origin: Origin::Old { old_satpoint },
-          });
-        }
+        continue;
+      }
 
-        input_value += if let Some(value) = self.value_cache.remove(&tx_in.previous_output) {
-          value
-        } else if let Some(value) = self
-          .outpoint_to_value
-          .remove(&tx_in.previous_output.store())?
-        {
-          value.value()
-        } else {
-          self.value_receiver.blocking_recv().ok_or_else(|| {
-            anyhow!(
-              "failed to get transaction for {}",
-              tx_in.previous_output.txid
-            )
-          })?
-        }
+      // find existing inscriptions on input aka transfers of inscriptions
+      for (old_satpoint, inscription_id) in
+        Index::inscriptions_on_output(self.satpoint_to_id, tx_in.previous_output)?
+      {
+        let offset = input_value + old_satpoint.offset;
+        floating_inscriptions.push(Flotsam {
+          offset,
+          inscription_id,
+          origin: Origin::Old { old_satpoint },
+        });
+
+        inscribed_offsets.insert(offset);
       }
-    }
 
-    if inscriptions.iter().all(|flotsam| flotsam.offset != 0)
-      && Inscription::from_transaction(tx).is_some()
-    {
-      let flotsam = Flotsam {
-        inscription_id: txid.into(),
-        offset: 0,
-        origin: Origin::New {
-          fee: input_value - tx.output.iter().map(|txout| txout.value).sum::<u64>(),
-        },
+      let offset = input_value;
+
+      // multi-level cache for UTXO set to get to the input amount
+      input_value += if let Some(value) = self.value_cache.remove(&tx_in.previous_output) {
+        value
+      } else if let Some(value) = self
+        .outpoint_to_value
+        .remove(&tx_in.previous_output.store())?
+      {
+        value.value()
+      } else {
+        self.value_receiver.blocking_recv().ok_or_else(|| {
+          anyhow!(
+            "failed to get transaction for {}",
+            tx_in.previous_output.txid
+          )
+        })?
       };
 
-      if input_value == 0 {
-        self.update_inscription_location(
-          input_sat_ranges,
-          flotsam,
-          SatPoint {
-            outpoint: unbound_outpoint(),
-            offset: self.unbound_inscriptions,
+      // go through all inscriptions in this input
+      while let Some(inscription) = new_inscriptions.peek() {
+        if inscription.tx_in_index != u32::try_from(input_index).unwrap() {
+          break;
+        }
+
+        // In this first part of the cursed inscriptions implementation we ignore reinscriptions.
+        // This will change once we implement reinscriptions.
+        let unbound =
+          inscribed_offsets.contains(&offset) || inscription.tx_in_offset != 0 || input_value == 0;
+
+        let cursed = inscribed_offsets.contains(&offset)
+          || inscription.tx_in_index != 0
+          || inscription.tx_in_offset != 0;
+
+        let inscription_id = InscriptionId {
+          txid,
+          index: id_counter,
+        };
+
+        floating_inscriptions.push(Flotsam {
+          inscription_id,
+          offset,
+          origin: Origin::New {
+            fee: 0,
+            cursed,
+            unbound,
           },
-        )?;
-        self.unbound_inscriptions += 1;
-      } else {
-        inscriptions.push(flotsam);
+        });
+
+        new_inscriptions.next();
+        id_counter += 1;
       }
-    };
+    }
+
+    // still have to normalize over inscription size
+    let total_output_value = tx.output.iter().map(|txout| txout.value).sum::<u64>();
+    let mut floating_inscriptions = floating_inscriptions
+      .into_iter()
+      .map(|flotsam| {
+        if let Flotsam {
+          inscription_id,
+          offset,
+          origin:
+            Origin::New {
+              fee: _,
+              cursed,
+              unbound,
+            },
+        } = flotsam
+        {
+          Flotsam {
+            inscription_id,
+            offset,
+            origin: Origin::New {
+              fee: (input_value - total_output_value) / u64::from(id_counter),
+              cursed,
+              unbound,
+            },
+          }
+        } else {
+          flotsam
+        }
+      })
+      .collect::<Vec<Flotsam>>();
 
     let is_coinbase = tx
       .input
@@ -144,11 +211,11 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
       .unwrap_or_default();
 
     if is_coinbase {
-      inscriptions.append(&mut self.flotsam);
+      floating_inscriptions.append(&mut self.flotsam);
     }
 
-    inscriptions.sort_by_key(|flotsam| flotsam.offset);
-    let mut inscriptions = inscriptions.into_iter().peekable();
+    floating_inscriptions.sort_by_key(|flotsam| flotsam.offset);
+    let mut inscriptions = floating_inscriptions.into_iter().peekable();
 
     let mut output_value = 0;
     for (vout, tx_out) in tx.output.iter().enumerate() {
@@ -212,15 +279,30 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
     new_satpoint: SatPoint,
   ) -> Result {
     let inscription_id = flotsam.inscription_id.store();
-
-    match flotsam.origin {
+    let unbound = match flotsam.origin {
       Origin::Old { old_satpoint } => {
         self.satpoint_to_id.remove(&old_satpoint.store())?;
+
+        false
       }
-      Origin::New { fee } => {
-        self
-          .number_to_id
-          .insert(&self.next_number, &inscription_id)?;
+      Origin::New {
+        fee,
+        cursed,
+        unbound,
+      } => {
+        let number = if cursed {
+          let next_cursed_number = self.next_cursed_number;
+          self.next_cursed_number -= 1;
+
+          next_cursed_number
+        } else {
+          let next_number = self.next_number;
+          self.next_number += 1;
+
+          next_number
+        };
+
+        self.number_to_id.insert(number, &inscription_id)?;
 
         let mut sat = None;
         if let Some(input_sat_ranges) = input_sat_ranges {
@@ -242,21 +324,30 @@ impl<'a, 'db, 'tx> InscriptionUpdater<'a, 'db, 'tx> {
           &InscriptionEntry {
             fee,
             height: self.height,
-            number: self.next_number,
+            number,
             sat,
             timestamp: self.timestamp,
           }
           .store(),
         )?;
 
-        self.next_number += 1;
+        unbound
       }
-    }
+    };
 
-    let new_satpoint = new_satpoint.store();
+    let satpoint = if unbound {
+      let new_unbound_satpoint = SatPoint {
+        outpoint: unbound_outpoint(),
+        offset: self.unbound_inscriptions,
+      };
+      self.unbound_inscriptions += 1;
+      new_unbound_satpoint.store()
+    } else {
+      new_satpoint.store()
+    };
 
-    self.satpoint_to_id.insert(&new_satpoint, &inscription_id)?;
-    self.id_to_satpoint.insert(&inscription_id, &new_satpoint)?;
+    self.satpoint_to_id.insert(&satpoint, &inscription_id)?;
+    self.id_to_satpoint.insert(&inscription_id, &satpoint)?;
 
     Ok(())
   }