group-by-work mode for fatcat-export

1 files changed, 157 insertions, 15 deletions

diff --git a/rust/src/bin/fatcat-export.rs b/rust/src/bin/fatcat-export.rs
index f52c7d17..3cc0c7a8 100644
--- a/rust/src/bin/fatcat-export.rs
+++ b/rust/src/bin/fatcat-export.rs
@@ -36,7 +36,8 @@ arg_enum! {
         Fileset,
         Webcapture,
         Release,
-        Work
+        Work,
+        ReleaseByWork,
     }
 }
 
@@ -44,6 +45,7 @@ struct IdentRow {
     ident_id: FatcatId,
     rev_id: Option<Uuid>,
     redirect_id: Option<FatcatId>,
+    group_id: Option<FatcatId>,
 }
 
 macro_rules! generic_loop_work {
@@ -87,6 +89,39 @@ generic_loop_work!(loop_work_webcapture, WebcaptureEntity);
 generic_loop_work!(loop_work_release, ReleaseEntity);
 generic_loop_work!(loop_work_work, WorkEntity);
 
+fn loop_work_release_by_work(
+    row_receiver: channel::Receiver<Vec<IdentRow>>,
+    output_sender: channel::Sender<Vec<String>>,
+    db_conn: &DbConn,
+    expand: Option<ExpandFlags>,
+) {
+    let result: Result<()> = (|| {
+        for row_batch in row_receiver {
+            let mut resp_batch: Vec<String> = vec![];
+            for row in row_batch {
+                let mut entity = ReleaseEntity::db_get_rev(
+                    db_conn,
+                    row.rev_id.expect("valid, non-deleted row"),
+                    HideFlags::none(),
+                )?; // .chain_err(|| "reading entity from database")?;
+                entity.state = Some("active".to_string()); // only active lines were passed
+                entity.ident = Some(row.ident_id.to_string());
+                if let Some(expand) = expand {
+                    entity.db_expand(db_conn, expand)?
+                    // chain_err(|| "expanding sub-entities from database")?;
+                }
+                resp_batch.push(serde_json::to_string(&entity)?);
+            }
+            output_sender.send(resp_batch);
+        }
+        Ok(())
+    })();
+    if let Err(ref e) = result {
+        error!("{}", e); // e.display_chain())
+    }
+    result.unwrap()
+}
+
 fn loop_printer(
     output_receiver: channel::Receiver<String>,
     done_sender: channel::Sender<()>,
@@ -104,11 +139,37 @@ fn loop_printer(
     Ok(())
 }
 
+fn loop_batch_printer(
+    output_receiver: channel::Receiver<Vec<String>>,
+    done_sender: channel::Sender<()>,
+) -> Result<()> {
+    let output = std::io::stdout();
+    // TODO: should log?
+    // let mut buf_output = BufWriter::new(output.lock());
+    let mut buf_output = BufWriter::new(output);
+    for batch in output_receiver {
+        for line in batch {
+            buf_output.write_all(&line.into_bytes())?;
+            buf_output.write_all(b"\n")?;
+            buf_output.flush()?;
+        }
+    }
+    drop(done_sender);
+    Ok(())
+}
+
 fn parse_line(s: &str) -> Result<IdentRow> {
     let fields: Vec<String> = s.split('\t').map(|v| v.to_string()).collect();
-    if fields.len() != 3 {
+    let group_id: Option<FatcatId> = if fields.len() == 4 {
+        match fields[3].as_ref() {
+            "" => None,
+            val => Some(FatcatId::from_uuid(&Uuid::from_str(&val)?)),
+        }
+    } else if fields.len() == 3 {
+        None
+    } else {
         bail!("Invalid input line");
-    }
+    };
     Ok(IdentRow {
         ident_id: FatcatId::from_uuid(&Uuid::from_str(&fields[0])?),
         rev_id: match fields[1].as_ref() {
@@ -119,6 +180,7 @@ fn parse_line(s: &str) -> Result<IdentRow> {
             "" => None,
             val => Some(FatcatId::from_uuid(&Uuid::from_str(&val)?)),
         },
+        group_id,
     })
 }
 
@@ -137,6 +199,9 @@ fn test_parse_line() {
             .is_err()
     );
     assert!(parse_line("00000000-0000-0000-3333-000000000002\t00000000-0000-0000-3333-fff000000001\t00000000-0000-0000-3333-000000000001").is_ok());
+    assert!(parse_line("00000000-0000-0000-3333-000000000002\t00000000-0000-0000-3333-fff000000001\t00000000-0000-0000-3333-000000000001\t").is_ok());
+    assert!(parse_line("00000000-0000-0000-3333-000000000002\t00000000-0000-0000-3333-fff000000001\t00000000-0000-0000-3333-000000000001\t\t").is_err());
+    assert!(parse_line("00000000-0000-0000-3333-000000000002\t00000000-0000-0000-3333-fff000000001\t00000000-0000-0000-3333-000000000001\t00000000-0000-0000-3333-000000000002").is_ok());
 }
 
 // Use num_cpus/2, or CLI arg for worker count
@@ -192,6 +257,7 @@ pub fn do_export(
             ExportEntityType::Work => {
                 thread::spawn(move || loop_work_work(row_receiver, output_sender, &db_conn, expand))
             }
+            ExportEntityType::ReleaseByWork => unimplemented!(),
         };
     }
     drop(output_sender);
@@ -221,22 +287,97 @@ pub fn do_export(
     Ok(())
 }
 
+pub fn do_export_batch(
+    num_workers: usize,
+    expand: Option<ExpandFlags>,
+    entity_type: ExportEntityType,
+    redirects: bool,
+) -> Result<()> {
+    let db_pool = server::database_worker_pool()?;
+    let buf_input = BufReader::new(std::io::stdin());
+    let (row_sender, row_receiver) = channel::bounded(CHANNEL_BUFFER_LEN);
+    let (output_sender, output_receiver) = channel::bounded(CHANNEL_BUFFER_LEN);
+    let (done_sender, done_receiver) = channel::bounded(0);
+
+    info!("Starting an export of {} entities", entity_type);
+
+    // Start row worker threads
+    assert!(num_workers > 0);
+    for _ in 0..num_workers {
+        let db_conn = db_pool.get().expect("database pool");
+        let row_receiver = row_receiver.clone();
+        let output_sender = output_sender.clone();
+        match entity_type {
+            ExportEntityType::ReleaseByWork => thread::spawn(move || {
+                loop_work_release_by_work(row_receiver, output_sender, &db_conn, expand)
+            }),
+            _ => unimplemented!(),
+        };
+    }
+    drop(output_sender);
+    // Start printer thread
+    thread::spawn(move || {
+        loop_batch_printer(output_receiver, done_sender).expect("printing to stdout")
+    });
+
+    let mut count = 0;
+    let mut last_group_id: Option<FatcatId> = None;
+    let mut batch = vec![];
+    for line in buf_input.lines() {
+        let line = line?;
+        let row = parse_line(&line)?;
+        match (row.rev_id, row.redirect_id, redirects) {
+            (None, _, _) => (),
+            (Some(_), Some(_), false) => (),
+            _ => {
+                if row.group_id == None || row.group_id != last_group_id {
+                    if batch.len() > 0 {
+                        row_sender.send(batch);
+                        batch = vec![];
+                    }
+                }
+                last_group_id = row.group_id;
+                batch.push(row);
+            }
+        }
+        count += 1;
+        if count % 1000 == 0 {
+            info!("processed {} lines...", count);
+        }
+    }
+    if batch.len() > 0 {
+        row_sender.send(batch);
+    }
+    drop(row_sender);
+    done_receiver.recv();
+    info!(
+        "Done reading ({} lines), waiting for workers to exit...",
+        count
+    );
+    Ok(())
+}
+
 fn main() -> Result<()> {
     let m = App::new("fatcat-export")
         .version(env!("CARGO_PKG_VERSION"))
         .author("Bryan Newbold <bnewbold@archive.org>")
         .about("Fast exports of database entities from an id list")
-        .arg(Arg::from_usage("<entity_type> 'what entity type the idents correspond to'")
-            .possible_values(&ExportEntityType::variants())
-            .case_insensitive(true))
+        .arg(
+            Arg::from_usage("<entity_type> 'what entity type the idents correspond to'")
+                .possible_values(&ExportEntityType::variants())
+                .case_insensitive(true),
+        )
         .args_from_usage(
             "-j --workers=[workers] 'number of threads (database connections) to use'
              -q --quiet 'less status output to stderr'
              --include-redirects 'include redirected idents (normally skipped)'
-             --expand=[expand] 'sub-entities to include in dump'")
-        .after_help("Reads a ident table TSV dump from stdin (aka, ident_id, rev_id, redirect_id), \
+             --expand=[expand] 'sub-entities to include in dump'",
+        )
+        .after_help(
+            "Reads a ident table TSV dump from stdin (aka, ident_id, rev_id, redirect_id), \
             and outputs JSON (one entity per line). Database connection info read from environment \
-            (DATABASE_URL, same as fatcatd).")
+            (DATABASE_URL, same as fatcatd).",
+        )
         .get_matches();
 
     let num_workers: usize = match m.value_of("workers") {
@@ -255,10 +396,11 @@ fn main() -> Result<()> {
     let env = env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, log_level);
     env_logger::Builder::from_env(env).init();
 
-    do_export(
-        num_workers,
-        expand,
-        value_t_or_exit!(m.value_of("entity_type"), ExportEntityType),
-        m.is_present("include_redirects"),
-    )
+    let entity_type = value_t_or_exit!(m.value_of("entity_type"), ExportEntityType);
+    let include_redirects = m.is_present("include_redirects");
+    if entity_type == ExportEntityType::ReleaseByWork {
+        do_export_batch(num_workers, expand, entity_type, include_redirects)
+    } else {
+        do_export(num_workers, expand, entity_type, include_redirects)
+    }
 }