[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10,"_11":12},"actionData","errors","root",{"_179":-5,"_182":183,"_184":185},"routes/shell",{"_41":42,"_178":-5,"_179":-5,"_180":181},"routes/repo",{"_34":-7,"_35":36,"_37":38,"_39":40,"_41":42,"_43":32,"_44":32,"_45":32,"_46":32,"_47":32,"_48":32,"_49":50,"_51":50,"_52":32,"_53":-7,"_54":-7,"_55":56,"_57":58,"_59":60,"_61":-5,"_62":63,"_64":65,"_66":67,"_68":69},"routes/repo.blob",{"_13":14,"_15":16,"_17":18,"_19":20,"_21":22,"_23":24,"_25":-5,"_26":27,"_28":29,"_29":30,"_31":32,"_33":14},"ref","main","path","crates/ltx/src/compactor.rs","oid","76d6b401996362d8209b7a9219323998aa75fb36","size",7139,"commit","90b43017241f81189453d326d05948f388b34652","mounts",[],"source","plain",{"_13":14,"_15":16},"kind","text","//! A streaming port of `superfly/ltx` v0.5.2 `Compactor`.\n//!\n//! The compactor keeps one decompressed page per input. It does not build a\n//! database-sized page map. Inputs must be ordered by transaction range.\n\nuse crate::codec::{Decoder, Encoder};\nuse crate::error::{Error, Result};\nuse crate::ltx::{Header, PageHeader, Trailer, VERSION};\nuse crate::TXID;\nuse std::io::{Read, Write};\nuse std::sync::atomic::{AtomicU32, Ordering};\n\n/// The current progress of a compaction.\n#[derive(Debug, Clone, Copy, PartialEq)]\npub struct CompactorStatus {\n /// The last page number processed by the merge.\n pub page_number: u32,\n /// The final input's commit page count.\n pub total: u32,\n}\n\nimpl CompactorStatus {\n pub fn is_zero(self) -> bool {\n self.page_number == 0 && self.total == 0\n }\n\n pub fn fraction(self) -> f64 {\n if self.total == 0 {\n 0.0\n } else {\n f64::from(self.page_number) / f64::from(self.total)\n }\n }\n}\n\n/// Merges ordered LTX inputs into one byte-compatible LTX output.\npub struct Compactor {\n encoder: Encoder,\n inputs: Vec>,\n page_number: AtomicU32,\n total: AtomicU32,\n\n /// Flags to set on the compacted LTX header.\n pub header_flags: u32,\n /// Allows gaps in the ordered input transaction ranges.\n pub allow_non_contiguous_txids: bool,\n}\n\nimpl Compactor {\n pub fn new(writer: W, readers: Vec) -> Self {\n Self {\n encoder: Encoder::new_block(writer),\n inputs: readers\n .into_iter()\n .map(|reader| CompactorInput {\n decoder: Decoder::new(reader),\n page: None,\n data: Vec::new(),\n })\n .collect(),\n page_number: AtomicU32::new(0),\n total: AtomicU32::new(0),\n header_flags: 0,\n allow_non_contiguous_txids: false,\n }\n }\n\n pub fn header(&self) -> Header {\n self.encoder.header\n }\n\n pub fn trailer(&self) -> Trailer {\n self.encoder.trailer\n }\n\n pub fn status(&self) -> CompactorStatus {\n CompactorStatus {\n page_number: self.page_number.load(Ordering::Relaxed),\n total: self.total.load(Ordering::Relaxed),\n }\n }\n\n pub fn writer(&self) -> &W {\n &self.encoder.writer\n }\n\n pub fn writer_mut(&mut self) -> &mut W {\n &mut self.encoder.writer\n }\n\n pub fn into_writer(self) -> W {\n self.encoder.writer\n }\n\n pub fn compact(&mut self) -> Result<()> {\n self.compact_inner(None)\n }\n\n /// A drained source can include transactions already in the destination.\n /// Repeating its pages is safe, but repeating its transaction range would\n /// break destination continuity. Validate every source key before changing\n /// the output range; a rebased checksum cannot be inferred from the input.\n pub(crate) fn compact_from(&mut self, min: TXID, ranges: &[(TXID, TXID)]) -> Result<()> {\n self.compact_inner(Some((min, ranges)))\n }\n\n fn compact_inner(&mut self, range: Option<(TXID, &[(TXID, TXID)])>) -> Result<()> {\n if self.inputs.is_empty() {\n return Err(Error::LTXCorrupted);\n }\n\n for input in &mut self.inputs {\n input.decoder.decode_header()?;\n }\n\n if let Some((min, ranges)) = range {\n let first = self.inputs[0].decoder.header;\n if ranges.len() != self.inputs.len()\n || min < first.min_txid\n || min > first.max_txid\n || (min != first.min_txid\n && self.header_flags & crate::ltx::HEADER_FLAG_NO_CHECKSUM == 0)\n || self.inputs.iter().zip(ranges).any(|(input, expected)| {\n let header = input.decoder.header;\n (header.min_txid, header.max_txid) != *expected\n })\n {\n return Err(Error::LTXCorrupted);\n }\n }\n\n for index in 1..self.inputs.len() {\n let previous = self.inputs[index - 1].decoder.header;\n let current = self.inputs[index].decoder.header;\n if previous.page_size != current.page_size {\n return Err(Error::LTXCorrupted);\n }\n if !self.allow_non_contiguous_txids\n && !is_contiguous(previous.max_txid, current.min_txid, current.max_txid)\n {\n return Err(Error::LTXCorrupted);\n }\n }\n\n let first = self.inputs[0].decoder.header;\n let last = self.inputs[self.inputs.len() - 1].decoder.header;\n self.encoder.encode_header(Header {\n version: VERSION,\n flags: self.header_flags,\n page_size: first.page_size,\n commit: last.commit,\n min_txid: range.map_or(first.min_txid, |(min, _)| min),\n max_txid: last.max_txid,\n timestamp: last.timestamp,\n pre_apply_checksum: first.pre_apply_checksum,\n ..Header::default()\n })?;\n self.total.store(last.commit, Ordering::Relaxed);\n\n for input in &mut self.inputs {\n input.data.resize(first.page_size as usize, 0);\n }\n\n loop {\n let Some(page_number) = self.fill_page_buffers()? else {\n break;\n };\n self.write_page_buffer(page_number)?;\n self.page_number.store(page_number, Ordering::Relaxed);\n }\n\n for input in &mut self.inputs {\n input.decoder.close()?;\n }\n\n let post_apply_checksum = self.inputs[self.inputs.len() - 1]\n .decoder\n .trailer\n .post_apply_checksum;\n self.encoder.close(post_apply_checksum)\n }\n\n fn fill_page_buffers(&mut self) -> Result> {\n let mut minimum = None;\n for input in &mut self.inputs {\n if input.page.is_none() {\n input.page = input.decoder.decode_page(&mut input.data)?;\n }\n if let Some(page) = input.page {\n minimum = Some(minimum.map_or(page.pgno, |value: u32| value.min(page.pgno)));\n }\n }\n Ok(minimum)\n }\n\n fn write_page_buffer(&mut self, page_number: u32) -> Result<()> {\n let commit = self.encoder.header.commit;\n let mut written = false;\n for input in self.inputs.iter_mut().rev() {\n let Some(page) = input.page else {\n continue;\n };\n if page.pgno != page_number {\n continue;\n }\n input.page = None;\n if written || page_number > commit {\n continue;\n }\n written = true;\n self.encoder.encode_page(page, &input.data)?;\n }\n Ok(())\n }\n}\n\nfn is_contiguous(previous_max: TXID, min: TXID, max: TXID) -> bool {\n min.0 <= previous_max.0.wrapping_add(1) && max > previous_max\n}\n\nstruct CompactorInput {\n decoder: Decoder,\n page: Option,\n data: Vec,\n}\n","editable",false,"branch","documentNavigation","repo","denoland/celld","repoId","a23b8a10-92cf-4dc4-a7ab-a04e58298dde","ownerId","org:42048915","site","nexthub","private","admin","settings","maintainer","triage","starred","stars",1,"watchers","watching","pinned","notify","views",[134,135,136,137,138,139,140,141,142,143,144,145,146],"navigation",{"_55":56,"_91":92,"_93":94,"_95":96,"_97":98,"_99":100,"_101":102},"sources",[],"viewer","meta",{"_83":84,"_85":86,"_87":88,"_43":32,"_89":14,"_90":32,"_49":50,"_51":50},"branches",[14],"tags",[70,71,72,73,74,75,76,77,78,79,80,81,82],"cloneUrl","https://git.nexthub.sh/denoland/celld.git","v0.0.1","v0.0.2","v0.1.0","v0.2.0","v0.2.1","v0.3.0","v0.4.0","v0.4.1","v0.5.0","v0.5.1","v0.6.0","v0.6.1","v0.6.2","description","self-hosted, distributed Durable Objects","owner","denoland","section","","head","empty","pins",[116,117,118],"documents",{"_111":112,"_113":114},"code",{"_108":109,"_110":104},"automations",{"_106":50,"_107":-5},"delivery",{"_103":104,"_105":-5},"tag","7gTA52Z9a1vO6FP6eCQPix9zO4O","releases",0,"applications","workflows","deployments","commits",13,"changes","counts",{"_115":114},"total",38,"issue",{"_119":110,"_121":132,"_15":110,"_123":133,"_53":125,"_126":32,"_127":125,"_128":104},{"_119":129,"_121":130,"_15":129,"_123":131,"_53":125,"_126":32,"_127":125,"_128":104},{"_119":120,"_121":122,"_15":120,"_123":124,"_53":125,"_126":32,"_127":125,"_128":114},"id","issues","name","Issues","filters",{},true,"saved","pinnable","count","tasks","Tasks",{},"Changes",{},{"_119":110,"_121":132,"_15":110,"_123":177,"_53":125,"_126":32,"_127":125},{"_119":129,"_121":130,"_15":129,"_123":176,"_53":125,"_126":32,"_127":125},{"_119":120,"_121":122,"_15":120,"_123":175,"_53":125,"_126":32,"_127":125},{"_119":172,"_121":173,"_15":172,"_123":174,"_53":32,"_126":32,"_127":125},{"_119":169,"_121":170,"_15":169,"_123":171,"_53":32,"_126":32,"_127":125},{"_119":106,"_121":167,"_15":97,"_123":168,"_53":32,"_126":32,"_127":125},{"_119":107,"_121":164,"_15":165,"_123":166,"_53":32,"_126":32,"_127":125},{"_119":103,"_121":162,"_15":103,"_123":163,"_53":32,"_126":32,"_127":125},{"_119":158,"_121":159,"_15":160,"_123":161,"_53":32,"_126":32,"_127":125},{"_119":93,"_121":156,"_15":93,"_123":157,"_53":32,"_126":32,"_127":32},{"_119":153,"_121":154,"_15":153,"_123":155,"_53":32,"_126":32,"_127":32},{"_119":150,"_121":151,"_15":150,"_123":152,"_53":32,"_126":32,"_127":32},{"_119":147,"_121":148,"_15":147,"_123":149,"_53":32,"_126":32,"_127":32},"decisions","Decisions",{},"changelog","Changelog",{},"roadmap","Roadmap",{},"Documents",{},"activity","Activity","insights",{},"Releases",{},"Deployments","automations/deployments",{},"Workflows",{},"discussions","Discussions",{},"goals","Goals",{},{},{},{},"groups","user","agents",[],"now",1794435698850,"sidebar","expanded"]