{"header":{"message":"Making `pijul lock` robust to kill signals","description":null,"timestamp":"2021-01-16T19:53:08.970305407Z","authors":[{"full_name":"Pierre-Étienne Meunier","name":"pmeunier"}]},"hash":"SN7AGY6SLIWVKLBHQQ2MZ7VYY4BBFKROC5F3M6FVVFIGT25QNX7AC","authors":[],"deps":{"hashes":[["SN7AGY6SLIWVKLBHQQ2MZ7VYY4BBFKROC5F3M6FVVFIGT25QNX7AC","Making `pijul lock` robust to kill signals"],["AA",null],["MBUNDZ3OES7FXMIYBICHRKXWEII5FZO3LFPSP5EDWQUG7KGP2NPQC","Lock: using tokio processes rather than std ones"],["OUWD436ATBTZJR53B6XDSI5SXRRNZV7YGRUEA5ACHZC2RUDP7G5QC","Version bump"],["CCLLB7OIFNFYJZTG3UCI7536TOCWSCSXR67VELSB466R24WLJSDAC","Upgrading to Sanakirja 0.15 + version bump"],["SXEYMYF7P4RZMZ46WPL4IZUTSQ2ATBWYZX7QNVMS3SGOYXYOHAGQC","Fixing the bad changes in history (unfortunately, by rebooting)."],["JACZWIJ6UEL5HWZRNOOXTFXUEG67XJDPC5D72LYUPCVVJ6WB7JQAC","Version bump"],["YX3VCEOM36NOK6757SD4SZX4FHB7FBAVRKFJH2QFPCYILC4SBRNAC","Version 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URLs"],["2K7JLB4Z7BS5VFNWD4DO3MKYU7VNPA5MTVHVSDI3FQZ5ICM6XM6QC","No pager on Windows"]],"deps":["MBUNDZ3OES7FXMIYBICHRKXWEII5FZO3LFPSP5EDWQUG7KGP2NPQC"],"known":["SXEYMYF7P4RZMZ46WPL4IZUTSQ2ATBWYZX7QNVMS3SGOYXYOHAGQC","3S4DR77ZU3XFGGDE6XSCUK6TN76IXNOQIKQSLDBM7KUHNILWHS3QC","OUWD436ATBTZJR53B6XDSI5SXRRNZV7YGRUEA5ACHZC2RUDP7G5QC","NX5I5H53IWX76GA3MTXTWZXU2HKUDL4ENED7LTGHMPWLHSAHYEAQC","B5Z4IMEUYAEJPOU5EIAXI7VYZVUM6CWKV7CTSOXK3F4GXTNNMMAAC","WI5BS6BSRA7T3BCDF6EGB2JZHTZRX4SLT5EG4D67PVRBTZH5YIXAC","OCBM7IFE7CL3PM5KPYTRTKTHYKC76NTFK5C4VA4JFAKQUA6GC7FAC","5BRU2RRWOQBMS2V3RQM7PRFR5UILYZ73GISHAKJA6KIZGC5M2MFAC","SAGSYAPXQ2T6GC3B3TNRPNFTZMS7UMME6YQGSF5MOIM66S5NKB2QC","WIORLB47KYY5ZDKSAQEQ5NV2J3F3RIO5FVGD6LGF73FD5LWJLUAAC","BT2ZHPY4LTECZDNPNLX5IUAEA6CYB4RRBGVBXUNK3ARHMWQK7KHAC","G6YZ7U65AW42M4RSWPXOCJH62XZ5OKVGOQ2UEB6SBNKNJEWYBAEQC","JACZWIJ6UEL5HWZRNOOXTFXUEG67XJDPC5D72LYUPCVVJ6WB7JQAC","XAY4DYRRPDEQY7XUWJ3OWSXPCEPZ6VFQ6273JPLE3FEGJQAGV6YQC","ZTVNGFNTYSZKPNWG7PGXTWVXKUM4KL2NKEUSMCUQYLCE4CYA6RVQC","YX3VCEOM36NOK6757SD4SZX4FHB7FBAVRKFJH2QFPCYILC4SBRNAC","5YDI33C4QRHATA6H3HHMBYFOBLAMXLLHWSDGJAH57DR6AMWO7AAQC","6DOXSHWGKJIMIPFCNLASGKBAJCJMJULW5HFRZAZ67EYSMXXGJ3KAC","CCLLB7OIFNFYJZTG3UCI7536TOCWSCSXR67VELSB466R24WLJSDAC","TPEH2XNBS5RO4IEVKENVF6P65AH7IX64KK2JAYMSJT3J5GXO67EAC","ZQXP3HNAQ3LKXJVLEO63OEGZIEVNHUQUW3NT7JLCB25OCAZ5ZVIQC","JRENVH5DF2F4SOV7UNJENFA7VDI3H63XK76R3LFZK6QCW7JIBLSQC","VYHHOEYHO67JNJEODX5L3CQFIV3DAXZBBIQUOMCWJDYF3VWICDNQC","JL4WKA5PBKXRNAMETYO4I52QKASQ3COYHH2JKGA7W5YLIRZZH53AC","W5NU4F6JQ52TZPV3ATPQ5NYWWIFODMR6RFV47JHGOGU47GSJVMRQC","64M73LNCB2V57AWAAKHK2NNERXANMV5V3XI3TFC4XR7FLJNCDCRQC","FI3WFMTSNVFWOQWSIWD64UCPRIS6MW4GOADOC6RXPHBSGZBYL5PAC"]},"hunks":[{"Replacement":{"inode":{"change":3,"pos":1956},"path":"pijul/src/repository/unix_lock.rs","line":31,"ins":{"up_context":[{"change":3,"pos":462}],"down_context":[{"change":3,"pos":491}],"flag":"BLOCK","start":0,"end":129,"inode":{"change":3,"pos":1956}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":462},"to":{"change":2,"start":162,"end":203},"introduced_by":2}],"inode":{"change":3,"pos":1956}},"ins_contents":[{"Add":" if let Err(e) = s.read_exact(&mut [0u8]).await {"},{"Add":" process.wait().await?;"},{"Add":" return Err(e);"},{"Add":" }"}],"del_contents":[{"Del":" s.read_exact(&mut [0u8]).await?;\n"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":1,"atom":{"NewVertex":{"up_context":[{"change":3,"pos":7180}],"down_context":[{"change":3,"pos":7245}],"flag":"BLOCK","start":130,"end":190,"inode":{"change":3,"pos":7180}}},"contents":[{"Add":"use clap::Clap;"},{"Add":"use fs2::FileExt;"},{"Add":"use std::fs::OpenOptions;"}]}},{"Replacement":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":8,"ins":{"up_context":[{"change":3,"pos":7365}],"down_context":[{"change":3,"pos":7415}],"flag":"BLOCK","start":191,"end":230,"inode":{"change":3,"pos":7180}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":7365},"to":{"change":3,"start":7365,"end":7415},"introduced_by":3}],"inode":{"change":3,"pos":7180}},"ins_contents":[{"Add":"use tokio::sync::{mpsc, watch, Mutex};"}],"del_contents":[{"Del":"use tokio::sync::{watch, Mutex};\n\nuse clap::Clap;\n"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":23,"atom":{"NewVertex":{"up_context":[{"change":3,"pos":877}],"down_context":[{"change":3,"pos":7905}],"flag":"BLOCK","start":231,"end":546,"inode":{"change":3,"pos":7180}}},"contents":[{"Add":" }"},{"Add":" self.run_socket().await"},{"Add":" }"},{"Add":""},{"Add":" async fn run_socket(self) -> Result<(), anyhow::Error> {"},{"Add":" let lock = self.path.with_extension(\"lock\");"},{"Add":" let file = OpenOptions::new().write(true).create(true).open(&lock)?;"},{"Add":" if file.try_lock_exclusive().is_err() {"},{"Add":" return Ok(());"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":33,"atom":{"NewVertex":{"up_context":[{"change":3,"pos":7915}],"down_context":[{"change":3,"pos":878}],"flag":"BLOCK","start":547,"end":603,"inode":{"change":3,"pos":7180}}},"contents":[{"Add":" std::fs::remove_file(&self.path).unwrap_or(());"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":41,"atom":{"EdgeMap":{"edges":[{"previous":"","flag":"DELETED","from":{"change":3,"pos":1066},"to":{"change":3,"start":7999,"end":8149},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":7999},"to":{"change":3,"start":7999,"end":8149},"introduced_by":3}],"inode":{"change":3,"pos":7180}}},"contents":[{"Del":" let n_clients = Arc::new(Mutex::new(0usize));\n let file = Arc::new(self.path.clone());\n\n let muttxn = Arc::new(Mutex::new(()));\n"}]}},{"Replacement":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":42,"ins":{"up_context":[{"change":3,"pos":8210}],"down_context":[{"change":3,"pos":8419}],"flag":"BLOCK","start":604,"end":1059,"inode":{"change":3,"pos":7180}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":8210},"to":{"change":3,"start":8210,"end":8358},"introduced_by":3}],"inode":{"change":3,"pos":7180}},"ins_contents":[{"Add":" let (done_tx, mut done_rx) = mpsc::channel(1);"},{"Add":" let file = Arc::new(self.path);"},{"Add":" let locks = Locks {"},{"Add":" n_clients: Arc::new(Mutex::new(0usize)),"},{"Add":" muttxn: Arc::new(Mutex::new(())),"},{"Add":" tx: Arc::new(tx),"},{"Add":" active_at_last_commit,"},{"Add":" file: file.clone(),"},{"Add":" clock: Arc::new(Mutex::new(0usize)),"},{"Add":" txn_counter: Arc::new(Mutex::new(0usize)),"},{"Add":" done_tx,"},{"Add":" };"}],"del_contents":[{"Del":" let tx = std::sync::Arc::new(tx);\n let clock = Arc::new(Mutex::new(0usize));\n let txn_counter = Arc::new(Mutex::new(0usize));\n"}]}},{"Replacement":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":55,"ins":{"up_context":[{"change":3,"pos":8434}],"down_context":[{"change":3,"pos":13718}],"flag":"BLOCK","start":1060,"end":1468,"inode":{"change":3,"pos":7180}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":8434},"to":{"change":3,"start":8434,"end":8479},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":8768},"to":{"change":3,"start":8768,"end":8885},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":9272},"to":{"change":3,"start":9272,"end":9496},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":9565},"to":{"change":3,"start":9565,"end":9720},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":9765},"to":{"change":3,"start":9765,"end":11259},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":11340},"to":{"change":3,"start":11340,"end":12167},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":12167},"to":{"change":3,"start":1067,"end":1137},"introduced_by":3},{"previous":"","flag":"DELETED","from":{"change":3,"pos":1137},"to":{"change":3,"start":12248,"end":12456},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":12248},"to":{"change":3,"start":12248,"end":12456},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":12879},"to":{"change":3,"start":12879,"end":13197},"introduced_by":3},{"previous":"","flag":"DELETED","from":{"change":3,"pos":349},"to":{"change":3,"start":13531,"end":13718},"introduced_by":3},{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":13531},"to":{"change":3,"start":13531,"end":13718},"introduced_by":3}],"inode":{"change":3,"pos":7180}},"ins_contents":[{"Add":" tokio::select! {"},{"Add":" x = tokio::time::timeout(std::time::Duration::from_secs(1), listener.accept()) => {"},{"Add":" if let Ok(Ok((stream, _))) = x {"},{"Add":" accept(stream, locks.clone()).await"},{"Add":" } else {"},{"Add":" break"},{"Add":" }"},{"Add":" },"},{"Add":" _ = done_rx.recv() => {"},{"Add":" break"}],"del_contents":[{"Del":" let x = listener.accept().await;\n"},{"Del":" match x {\n Ok((mut stream, _addr)) => {\n *n_clients.lock().await += 1;\n"},{"Del":" let file = file.clone();\n let muttxn = muttxn.clone();\n let mut active_at_last_commit = active_at_last_commit.clone();\n let clock = clock.clone();\n"},{"Del":" let txn_counter = txn_counter.clone();\n let n_clients = n_clients.clone();\n let tx = tx.clone();\n"},{"Del":" tokio::spawn(async move {\n let mut t = [0u8];\n while let Ok(n) = stream.read(&mut t).await {\n if n == 0 {\n break;\n }\n if t[0] == 1 {\n // muttxn\n let lock = if let Ok(guard) = muttxn.try_lock() {\n guard\n } else {\n stream.write_all(&[LOCKED]).await.unwrap_or(());\n muttxn.lock().await\n };\n while *active_at_last_commit.borrow() > 0 {\n stream.write_all(&[LOCKED]).await.unwrap_or(());\n active_at_last_commit.changed().await.unwrap();\n }\n stream.write_all(&[ACK]).await.unwrap_or(());\n if let Ok(n) = stream.read(&mut t).await {\n if n == 0 {\n break;\n }\n if t[0] == COMMIT {\n // commit\n let mut clock = clock.lock().await;\n *clock += 1;\n"},{"Del":" let counter = *txn_counter.lock().await;\n tx.send(counter).unwrap();\n }\n }\n std::mem::drop(lock);\n } else {\n // txn\n *txn_counter.lock().await += 1;\n let start_date = *clock.lock().await;\n stream.write_all(&[ACK]).await.unwrap_or(());\n let n = stream.read(&mut t).await.unwrap_or(0);\n if n == 0 {\n break;\n }\n *txn_counter.lock().await -= 1;\n"},{"Del":" if start_date < *clock.lock().await {\n"},{"Del":" let last = *active_at_last_commit.borrow();\n tx.send(last - 1).unwrap();\n }\n }\n"},{"Del":" }\n if *n_clients.lock().await == 1 {\n tokio::time::sleep(std::time::Duration::from_secs(1)).await;\n if *n_clients.lock().await == 1 {\n std::fs::remove_file(file.as_ref()).unwrap_or(());\n"},{"Del":" std::process::exit(0)\n }\n }\n *n_clients.lock().await -= 1\n });\n"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":66,"atom":{"EdgeMap":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":13736},"to":{"change":3,"start":13736,"end":13769},"introduced_by":3}],"inode":{"change":3,"pos":7180}}},"contents":[{"Del":" Err(_) => break,\n"}]}},{"Replacement":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":69,"ins":{"up_context":[{"change":3,"pos":13852}],"down_context":[{"change":3,"pos":14072}],"flag":"BLOCK","start":1469,"end":1484,"inode":{"change":3,"pos":7180}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":14042},"to":{"change":3,"start":14042,"end":14072},"introduced_by":3}],"inode":{"change":3,"pos":7180}},"ins_contents":[{"Add":" Ok(())"}],"del_contents":[{"Del":" std::process::exit(0)\n"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":71,"atom":{"NewVertex":{"up_context":[{"change":3,"pos":14078}],"down_context":[{"change":3,"pos":14078}],"flag":"BLOCK","start":1485,"end":1789,"inode":{"change":3,"pos":7180}}},"contents":[{"Add":"}"},{"Add":""},{"Add":"#[derive(Clone)]"},{"Add":"struct Locks {"},{"Add":" n_clients: Arc>,"},{"Add":" file: Arc,"},{"Add":" muttxn: Arc>,"},{"Add":" clock: Arc>,"},{"Add":" txn_counter: Arc>,"},{"Add":" active_at_last_commit: watch::Receiver,"},{"Add":" tx: Arc>,"},{"Add":" done_tx: mpsc::Sender<()>,"}]}},{"Edit":{"inode":{"change":3,"pos":7180},"path":"pijul/src/commands/lock.rs","line":84,"atom":{"NewVertex":{"up_context":[{"change":3,"pos":14080}],"down_context":[],"flag":"BLOCK","start":1790,"end":4166,"inode":{"change":3,"pos":7180}}},"contents":[{"Add":""},{"Add":"async fn accept(mut stream: tokio::net::UnixStream, mut locks: Locks) {"},{"Add":" *locks.n_clients.lock().await += 1;"},{"Add":" tokio::spawn(async move {"},{"Add":" let mut t = [0u8];"},{"Add":" while let Ok(n) = stream.read(&mut t).await {"},{"Add":" if n == 0 {"},{"Add":" break;"},{"Add":" }"},{"Add":" if t[0] == 1 {"},{"Add":" // muttxn"},{"Add":" let lock = if let Ok(guard) = locks.muttxn.try_lock() {"},{"Add":" guard"},{"Add":" } else {"},{"Add":" stream.write_all(&[LOCKED]).await.unwrap_or(());"},{"Add":" locks.muttxn.lock().await"},{"Add":" };"},{"Add":" while *locks.active_at_last_commit.borrow() > 0 {"},{"Add":" stream.write_all(&[LOCKED]).await.unwrap_or(());"},{"Add":" locks.active_at_last_commit.changed().await.unwrap();"},{"Add":" }"},{"Add":" stream.write_all(&[ACK]).await.unwrap_or(());"},{"Add":" if let Ok(n) = stream.read(&mut t).await {"},{"Add":" if n == 0 {"},{"Add":" break;"},{"Add":" }"},{"Add":" if t[0] == COMMIT {"},{"Add":" // commit"},{"Add":" let mut clock = locks.clock.lock().await;"},{"Add":" *clock += 1;"},{"Add":" let counter = *locks.txn_counter.lock().await;"},{"Add":" locks.tx.send(counter).unwrap();"},{"Add":" }"},{"Add":" }"},{"Add":" std::mem::drop(lock)"},{"Add":" } else {"},{"Add":" // txn"},{"Add":" *locks.txn_counter.lock().await += 1;"},{"Add":" let start_date = *locks.clock.lock().await;"},{"Add":" stream.write_all(&[ACK]).await.unwrap_or(());"},{"Add":" let n = stream.read(&mut t).await.unwrap_or(0);"},{"Add":" if n == 0 {"},{"Add":" break;"},{"Add":" }"},{"Add":" *locks.txn_counter.lock().await -= 1;"},{"Add":" if start_date < *locks.clock.lock().await {"},{"Add":" let last = *locks.active_at_last_commit.borrow();"},{"Add":" locks.tx.send(last - 1).unwrap();"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":" if *locks.n_clients.lock().await == 1 {"},{"Add":" tokio::time::sleep(std::time::Duration::from_secs(1)).await;"},{"Add":" if *locks.n_clients.lock().await == 1 {"},{"Add":" locks.done_tx.send(()).await.unwrap();"},{"Add":" return;"},{"Add":" }"},{"Add":" }"},{"Add":" *locks.n_clients.lock().await -= 1"},{"Add":" });"},{"Add":"}"}]}},{"Replacement":{"inode":{"change":3,"pos":196374},"path":"pijul/Cargo.toml","line":4,"ins":{"up_context":[{"change":3,"pos":196462}],"down_context":[{"change":3,"pos":196488}],"flag":"BLOCK","start":4167,"end":4194,"inode":{"change":3,"pos":196374}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":196462},"to":{"change":3,"start":16737,"end":16764},"introduced_by":3}],"inode":{"change":3,"pos":196374}},"ins_contents":[{"Add":"version = \"1.0.0-alpha.35\""}],"del_contents":[{"Del":"version = \"1.0.0-alpha.33\"\n"}]}},{"Edit":{"inode":{"change":3,"pos":196374},"path":"pijul/Cargo.toml","line":87,"atom":{"NewVertex":{"up_context":[{"change":31,"pos":2300}],"down_context":[{"change":32,"pos":309}],"flag":"BLOCK","start":4195,"end":4207,"inode":{"change":3,"pos":196374}}},"contents":[{"Add":"fs2 = \"0.4\""}]}}],"owner":"irevoire","repo":"pijul","token":"LlEtDOFMNyGrFonb1c72epJ7kcRh2wmnX1BMV1RtTQg=","login":null}

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