LCOV - code coverage report
Current view: top level - safekeeper/tests/walproposer_sim - simulation_logs.rs (source / functions) Coverage Total Hit
Test: 5713ff31fc16472ab3f92425989ca6addc3dcf9c.info Lines: 94.1 % 101 95
Test Date: 2025-07-30 16:18:19 Functions: 33.3 % 18 6

            Line data    Source code
       1              : use desim::proto::SimEvent;
       2              : use tracing::debug;
       3              : 
       4              : #[derive(Debug, Clone, PartialEq, Eq)]
       5              : enum NodeKind {
       6              :     Unknown,
       7              :     Safekeeper,
       8              :     WalProposer,
       9              : }
      10              : 
      11              : impl Default for NodeKind {
      12        10621 :     fn default() -> Self {
      13        10621 :         Self::Unknown
      14        10621 :     }
      15              : }
      16              : 
      17              : /// Simulation state of walproposer/safekeeper, derived from the simulation logs.
      18              : #[derive(Clone, Debug, Default)]
      19              : struct NodeInfo {
      20              :     kind: NodeKind,
      21              : 
      22              :     // walproposer
      23              :     is_sync: bool,
      24              :     term: u64,
      25              :     epoch_lsn: u64,
      26              : 
      27              :     // safekeeper
      28              :     commit_lsn: u64,
      29              :     flush_lsn: u64,
      30              : }
      31              : 
      32              : impl NodeInfo {
      33        18918 :     fn init_kind(&mut self, kind: NodeKind) {
      34        18918 :         if self.kind == NodeKind::Unknown {
      35        10621 :             self.kind = kind;
      36        10621 :         } else {
      37         8297 :             assert!(self.kind == kind);
      38              :         }
      39        18918 :     }
      40              : 
      41        18918 :     fn started(&mut self, data: &str) {
      42        18918 :         let mut parts = data.split(';');
      43        18918 :         assert!(parts.next().unwrap() == "started");
      44        18918 :         match parts.next().unwrap() {
      45        18918 :             "safekeeper" => {
      46         9800 :                 self.init_kind(NodeKind::Safekeeper);
      47         9800 :             }
      48         9118 :             "walproposer" => {
      49         9118 :                 self.init_kind(NodeKind::WalProposer);
      50         9118 :                 let is_sync: u8 = parts.next().unwrap().parse().unwrap();
      51         9118 :                 self.is_sync = is_sync != 0;
      52         9118 :             }
      53            0 :             _ => unreachable!(),
      54              :         }
      55        18918 :     }
      56              : }
      57              : 
      58              : /// Global state of the simulation, derived from the simulation logs.
      59              : #[derive(Debug, Default)]
      60              : struct GlobalState {
      61              :     nodes: Vec<NodeInfo>,
      62              :     commit_lsn: u64,
      63              :     write_lsn: u64,
      64              :     max_write_lsn: u64,
      65              : 
      66              :     written_wal: u64,
      67              :     written_records: u64,
      68              : }
      69              : 
      70              : impl GlobalState {
      71          501 :     fn new() -> Self {
      72          501 :         Default::default()
      73          501 :     }
      74              : 
      75        35580 :     fn get(&mut self, id: u32) -> &mut NodeInfo {
      76        35580 :         let id = id as usize;
      77        35580 :         if id >= self.nodes.len() {
      78        10621 :             self.nodes.resize(id + 1, NodeInfo::default());
      79        24959 :         }
      80        35580 :         &mut self.nodes[id]
      81        35580 :     }
      82              : }
      83              : 
      84              : /// Try to find inconsistencies in the simulation log.
      85          501 : pub fn validate_events(events: Vec<SimEvent>) {
      86              :     const INITDB_LSN: u64 = 21623024;
      87              : 
      88          501 :     let hook = std::panic::take_hook();
      89          501 :     scopeguard::defer_on_success! {
      90              :         std::panic::set_hook(hook);
      91              :     };
      92              : 
      93          501 :     let mut state = GlobalState::new();
      94          501 :     state.max_write_lsn = INITDB_LSN;
      95              : 
      96        27750 :     for event in events {
      97        27249 :         debug!("{:?}", event);
      98              : 
      99        27249 :         let node = state.get(event.node);
     100        27249 :         if event.data.starts_with("started;") {
     101        18918 :             node.started(&event.data);
     102        18918 :             continue;
     103         8331 :         }
     104         8331 :         assert!(node.kind != NodeKind::Unknown);
     105              : 
     106              :         // drop reference to unlock state
     107         8331 :         let mut node = node.clone();
     108              : 
     109         8331 :         let mut parts = event.data.split(';');
     110         8331 :         match node.kind {
     111         7421 :             NodeKind::Safekeeper => match parts.next().unwrap() {
     112         7421 :                 "tli_loaded" => {
     113         7421 :                     let flush_lsn: u64 = parts.next().unwrap().parse().unwrap();
     114         7421 :                     let commit_lsn: u64 = parts.next().unwrap().parse().unwrap();
     115         7421 :                     node.flush_lsn = flush_lsn;
     116         7421 :                     node.commit_lsn = commit_lsn;
     117         7421 :                 }
     118            0 :                 _ => unreachable!(),
     119              :             },
     120              :             NodeKind::WalProposer => {
     121          910 :                 match parts.next().unwrap() {
     122          910 :                     "prop_elected" => {
     123          392 :                         let prop_lsn: u64 = parts.next().unwrap().parse().unwrap();
     124          392 :                         let prop_term: u64 = parts.next().unwrap().parse().unwrap();
     125          392 :                         let prev_lsn: u64 = parts.next().unwrap().parse().unwrap();
     126          392 :                         let prev_term: u64 = parts.next().unwrap().parse().unwrap();
     127              : 
     128          392 :                         assert!(prop_lsn >= prev_lsn);
     129          392 :                         assert!(prop_term >= prev_term);
     130              : 
     131          392 :                         assert!(prop_lsn >= state.commit_lsn);
     132              : 
     133          392 :                         if prop_lsn > state.write_lsn {
     134           40 :                             assert!(prop_lsn <= state.max_write_lsn);
     135           40 :                             debug!(
     136            0 :                                 "moving write_lsn up from {} to {}",
     137              :                                 state.write_lsn, prop_lsn
     138              :                             );
     139           40 :                             state.write_lsn = prop_lsn;
     140          352 :                         }
     141          392 :                         if prop_lsn < state.write_lsn {
     142           84 :                             debug!(
     143            0 :                                 "moving write_lsn down from {} to {}",
     144              :                                 state.write_lsn, prop_lsn
     145              :                             );
     146           84 :                             state.write_lsn = prop_lsn;
     147          308 :                         }
     148              : 
     149          392 :                         node.epoch_lsn = prop_lsn;
     150          392 :                         node.term = prop_term;
     151              :                     }
     152          518 :                     "write_wal" => {
     153          327 :                         assert!(!node.is_sync);
     154          327 :                         let start_lsn: u64 = parts.next().unwrap().parse().unwrap();
     155          327 :                         let end_lsn: u64 = parts.next().unwrap().parse().unwrap();
     156          327 :                         let cnt: u64 = parts.next().unwrap().parse().unwrap();
     157              : 
     158          327 :                         let size = end_lsn - start_lsn;
     159          327 :                         state.written_wal += size;
     160          327 :                         state.written_records += cnt;
     161              : 
     162              :                         // TODO: If we allow writing WAL before winning the election
     163              : 
     164          327 :                         assert!(start_lsn >= state.commit_lsn);
     165          327 :                         assert!(end_lsn >= start_lsn);
     166              :                         // assert!(start_lsn == state.write_lsn);
     167          327 :                         state.write_lsn = end_lsn;
     168              : 
     169          327 :                         if end_lsn > state.max_write_lsn {
     170          264 :                             state.max_write_lsn = end_lsn;
     171          264 :                         }
     172              :                     }
     173          191 :                     "commit_lsn" => {
     174          191 :                         let lsn: u64 = parts.next().unwrap().parse().unwrap();
     175          191 :                         assert!(lsn >= state.commit_lsn);
     176          191 :                         state.commit_lsn = lsn;
     177              :                     }
     178            0 :                     _ => unreachable!(),
     179              :                 }
     180              :             }
     181            0 :             _ => unreachable!(),
     182              :         }
     183              : 
     184              :         // update the node in the state struct
     185         8331 :         *state.get(event.node) = node;
     186              :     }
     187          501 : }
        

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