server: snapshot

2026-07-30 04:08:11 -07:00 · 2025-12-15 16:32:45 +01:00
parent 882a3525af
commit 825a4a77c0
100 changed files with 2677 additions and 3438 deletions
@@ -0,0 +1,63 @@
+use brk_computer::Computer;
+use brk_types::{DifficultyAdjustmentEntry, DifficultyEpoch, Height};
+use vecdb::{GenericStoredVec, IterableVec, VecIndex};
+
+/// Iterate over difficulty epochs within a height range.
+pub fn iter_difficulty_epochs(
+    computer: &Computer,
+    start_height: usize,
+    end_height: usize,
+) -> Vec<DifficultyAdjustmentEntry> {
+    let start_epoch = computer
+        .indexes
+        .height_to_difficultyepoch
+        .read_once(Height::from(start_height))
+        .unwrap_or_default();
+    let end_epoch = computer
+        .indexes
+        .height_to_difficultyepoch
+        .read_once(Height::from(end_height))
+        .unwrap_or_default();
+
+    let mut epoch_to_height_iter = computer.indexes.difficultyepoch_to_first_height.iter();
+    let mut epoch_to_timestamp_iter = computer.chain.difficultyepoch_to_timestamp.iter();
+    let mut epoch_to_difficulty_iter = computer
+        .chain
+        .indexes_to_difficulty
+        .difficultyepoch
+        .unwrap_last()
+        .iter();
+
+    let mut results = Vec::with_capacity(end_epoch.to_usize() - start_epoch.to_usize() + 1);
+    let mut prev_difficulty: Option<f64> = None;
+
+    for epoch_usize in start_epoch.to_usize()..=end_epoch.to_usize() {
+        let epoch = DifficultyEpoch::from(epoch_usize);
+        let epoch_height = epoch_to_height_iter.get(epoch).unwrap_or_default();
+
+        // Skip epochs before our start height but track difficulty
+        if epoch_height.to_usize() < start_height {
+            prev_difficulty = epoch_to_difficulty_iter.get(epoch).map(|d| *d);
+            continue;
+        }
+
+        let epoch_timestamp = epoch_to_timestamp_iter.get(epoch).unwrap_or_default();
+        let epoch_difficulty = *epoch_to_difficulty_iter.get(epoch).unwrap_or_default();
+
+        let change_percent = match prev_difficulty {
+            Some(prev) if prev > 0.0 => ((epoch_difficulty / prev) - 1.0) * 100.0,
+            _ => 0.0,
+        };
+
+        results.push(DifficultyAdjustmentEntry {
+            timestamp: epoch_timestamp,
+            height: epoch_height,
+            difficulty: epoch_difficulty,
+            change_percent,
+        });
+
+        prev_difficulty = Some(epoch_difficulty);
+    }
+
+    results
+}