Method append_entries

nodedb-raft/src/log.rs:103–122

Append new entries from a leader's AppendEntries RPC. Handles conflict detection per Raft paper §5.3: - If an existing entry conflicts with a new one (same index, different terms), delete the existing entry and all that follow it. - Append any new entries not already in the log.

(&mut self, _prev_index: u64, entries: &[LogEntry])

    ///   terms), delete the existing entry and all that follow it.
    /// - Append any new entries not already in the log.
    pub fn append_entries(&mut self, _prev_index: u64, entries: &[LogEntry]) -> Result<()> {
        for entry in entries {
            if let Some(existing) = self.entry_at(entry.index) {
                if existing.term != entry.term {
                    // Conflict: truncate from this index onward.
                    self.truncate_from(entry.index);
                    self.entries.push(entry.clone());
                }
                // Same term = already present, skip.
            } else {
                self.entries.push(entry.clone());
            }
        }

        // Persist.
        if !entries.is_empty() {
            self.storage.append(entries)?;
        }
        Ok(())
    }

    /// Append a single entry proposed by the leader.
    pub fn append(&mut self, entry: LogEntry) -> Result<()> {