2 files changed, 162 insertions, 1 deletions
diff --git a/rust/src/bin/fatcat-export.rs b/rust/src/bin/fatcat-export.rs
new file mode 100644
index 00000000..d7371c87
--- /dev/null
+++ b/rust/src/bin/fatcat-export.rs
@@ -0,0 +1,161 @@
+//! JSON Export Helper
+
+extern crate clap;
+extern crate diesel;
+extern crate dotenv;
+#[macro_use]
+extern crate error_chain;
+extern crate fatcat;
+extern crate fatcat_api_spec;
+#[macro_use]
+extern crate slog;
+extern crate slog_async;
+extern crate slog_term;
+extern crate uuid;
+extern crate crossbeam_channel;
+extern crate serde_json;
+
+use clap::{App, Arg};
+use slog::{Drain, Logger};
+use dotenv::dotenv;
+use std::env;
+
+use diesel::prelude::*;
+use diesel::r2d2::ConnectionManager;
+use fatcat_api_spec::models::*;
+use std::str::FromStr;
+use uuid::Uuid;
+use fatcat::ConnectionPool;
+use fatcat::api_helpers::*;
+use fatcat::api_entity_crud::*;
+use fatcat::errors::*;
+
+use std::thread;
+//use std::io::{Stdout,StdoutLock};
+use crossbeam_channel as channel;
+//use num_cpus; TODO:
+use std::io::prelude::*;
+use std::io::{BufReader, BufWriter};
+
+const CHANNEL_BUFFER_LEN: usize = 200;
+
+struct IdentRow {
+    ident_id: FatCatId,
+    rev_id: Option<Uuid>,
+    redirect_id: Option<FatCatId>,
+}
+
+/// Instantiate a new API server with a pooled database connection
+pub fn database_worker_pool() -> Result<ConnectionPool> {
+    dotenv().ok();
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    let manager = ConnectionManager::<PgConnection>::new(database_url);
+    let pool = diesel::r2d2::Pool::builder()
+        .build(manager)
+        .expect("Failed to create database pool.");
+    Ok(pool)
+}
+
+fn loop_work(row_receiver: channel::Receiver<IdentRow>, output_sender: channel::Sender<String>, db_conn: &DbConn, expand: Option<ExpandFlags>) -> Result<()> {
+    for row in row_receiver {
+        // TODO: based on types
+        let mut entity = ReleaseEntity::db_get_rev(db_conn, row.rev_id.expect("valid, non-deleted row"))?;
+        entity.state = Some("active".to_string()); // TODO
+        entity.ident = Some(row.ident_id.to_string());
+        if let Some(expand) = expand {
+            entity.db_expand(db_conn, expand)?;
+        }
+        output_sender.send(serde_json::to_string(&entity)?);
+    }
+    Ok(())
+}
+
+fn loop_printer(output_receiver: channel::Receiver<String>, done_sender: channel::Sender<()>) -> Result<()> {
+    let output = std::io::stdout();
+    // XXX should log...
+    // let mut buf_output = BufWriter::new(output.lock());
+    let mut buf_output = BufWriter::new(output);
+    for line in output_receiver {
+        buf_output.write_all(&line.into_bytes())?;
+        buf_output.write(b"\n")?;
+        buf_output.flush()?;
+    }
+    drop(done_sender);
+    Ok(())
+}
+
+fn parse_line(s: String) -> Result<IdentRow> {
+    let fields: Vec<String> = s.split("\t").map(|v| v.to_string()).collect();
+    if fields.len() != 3 {
+        bail!("Invalid input line");
+    }
+    Ok(IdentRow {
+        ident_id: FatCatId::from_uuid(&Uuid::from_str(&fields[0])?),
+        rev_id: Some(Uuid::from_str(&fields[1])?),
+        redirect_id: None,
+    })
+}
+
+#[test]
+fn test_parse_line() {
+    assert!(false)
+}
+
+// Use num_cpus/2, or CLI arg for worker count
+//
+// 1. open buffered reader, buffered writer, and database pool. create channels
+// 2. spawn workers:
+//      - get a database connection from database pool
+//      - iterate over row channel, pushing Strings to output channel
+//      - exit when end of rows
+// 3. spawn output printer
+// 4. read rows, pushing to row channel
+//      => every N lines, log to stderr
+// 5. wait for all channels to finish, and quit
+pub fn run() -> Result<()> {
+
+    let db_pool = database_worker_pool()?;
+    let buf_input = BufReader::new(std::io::stdin());
+    let worker_count = 4;
+    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);
+
+    // Start row worker threads
+    for _ in 0..worker_count {
+        let db_conn = db_pool.get().expect("database pool");
+        let row_receiver = row_receiver.clone();
+        let output_sender = output_sender.clone();
+        thread::spawn(move || loop_work(row_receiver, output_sender, &db_conn, None));
+    }
+    drop(output_sender);
+    // Start printer thread
+    thread::spawn(move || loop_printer(output_receiver, done_sender));
+
+    for line in buf_input.lines() {
+        let line = line?;
+        let row = parse_line(line)?;
+        row_sender.send(row);
+    }
+    drop(row_sender);
+    done_receiver.recv();
+    Ok(())
+}
+
+fn main() {
+    /*
+    let matches = App::new("server")
+        .arg(
+            Arg::with_name("https")
+                .long("https")
+                .help("Whether to use HTTPS or not"),
+        )
+        .get_matches();
+
+    let decorator = slog_term::TermDecorator::new().build();
+    let drain = slog_term::CompactFormat::new(decorator).build().fuse();
+    let drain = slog_async::Async::new(drain).build().fuse();
+    let logger = Logger::root(drain, o!());
+    */
+    run().expect("success")
+}
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 381c67ea..d3ef4a9c 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -29,7 +29,7 @@ pub mod api_wrappers;
 pub mod database_models;
 pub mod database_schema;
 
-mod errors {
+pub mod errors {
     // Create the Error, ErrorKind, ResultExt, and Result types
     error_chain! {
         foreign_links { Fmt(::std::fmt::Error);