aboutsummaryrefslogtreecommitdiffstats
path: root/rust/src/bin/fatcat-export.rs
blob: 9dd5138ea4beda7e77d6fb704f1c59a8e20928a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
//! JSON Export Helper

#[macro_use]
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 log;
extern crate crossbeam_channel;
extern crate env_logger;
extern crate num_cpus;
extern crate serde_json;
extern crate uuid;

use clap::{App, Arg};
use dotenv::dotenv;
use std::env;

use diesel::prelude::*;
use diesel::r2d2::ConnectionManager;
use fatcat::api_entity_crud::*;
use fatcat::api_helpers::*;
use fatcat::errors::*;
use fatcat::ConnectionPool;
use fatcat_api_spec::models::*;
use std::str::FromStr;
use uuid::Uuid;

use error_chain::ChainedError;
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;

arg_enum!{
    #[derive(PartialEq, Debug, Clone, Copy)]
    pub enum ExportEntityType {
        Creator,
        Container,
        File,
        Release,
        Work
    }
}

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)
}

macro_rules! generic_loop_work {
    ($fn_name:ident, $entity_model:ident) => {
        fn $fn_name(row_receiver: channel::Receiver<IdentRow>, output_sender: channel::Sender<String>, db_conn: &DbConn, expand: Option<ExpandFlags>) {
            let result: Result<()> = (|| {
                for row in row_receiver {
                    let mut entity = $entity_model::db_get_rev(db_conn, row.rev_id.expect("valid, non-deleted row"), HideFlags::none())
                        .chain_err(|| "reading entity from database")?;
                    //let mut entity = ReleaseEntity::db_get_rev(db_conn, row.rev_id.expect("valid, non-deleted row"))?;
                    entity.state = Some("active".to_string()); // XXX
                    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")?;
                    }
                    output_sender.send(serde_json::to_string(&entity)?);
                }
                Ok(())
            })();
            if let Err(ref e) = result {
                error!("{}", e.display_chain())
            }
            result.unwrap()
        }
    }
}

generic_loop_work!(loop_work_container, ContainerEntity);
generic_loop_work!(loop_work_creator, CreatorEntity);
generic_loop_work!(loop_work_file, FileEntity);
generic_loop_work!(loop_work_release, ReleaseEntity);
generic_loop_work!(loop_work_work, WorkEntity);

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: &str) -> 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: match fields[1].as_ref() {
            "" => None,
            val => Some(Uuid::from_str(&val)?),
        },
        redirect_id: match fields[2].as_ref() {
            "" => None,
            val => Some(FatCatId::from_uuid(&Uuid::from_str(&val)?)),
        },
    })
}

#[test]
fn test_parse_line() {
    assert!(
        parse_line("00000000-0000-0000-3333-000000000001\t00000000-0000-0000-3333-fff000000001\t")
            .is_ok()
    );
    assert!(
        parse_line("00000-0000-0000-3333-000000000001\t00000000-0000-0000-3333-fff000000001\t")
            .is_err()
    );
    assert!(
        parse_line("00000-0000-0000-3333-000000000001\t00000000-0000-0000-3333-fff000000001")
            .is_err()
    );
    assert!(parse_line("00000000-0000-0000-3333-000000000002\t00000000-0000-0000-3333-fff000000001\t00000000-0000-0000-3333-000000000001").is_ok());
}

// 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 do_export(
    num_workers: usize,
    expand: Option<ExpandFlags>,
    entity_type: ExportEntityType,
    redirects: bool,
) -> Result<()> {
    let db_pool = 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::Container => thread::spawn(move || {
                loop_work_container(row_receiver, output_sender, &db_conn, expand)
            }),
            ExportEntityType::Creator => thread::spawn(move || {
                loop_work_creator(row_receiver, output_sender, &db_conn, expand)
            }),
            ExportEntityType::File => {
                thread::spawn(move || loop_work_file(row_receiver, output_sender, &db_conn, expand))
            }
            ExportEntityType::Release => thread::spawn(move || {
                loop_work_release(row_receiver, output_sender, &db_conn, expand)
            }),
            ExportEntityType::Work => {
                thread::spawn(move || loop_work_work(row_receiver, output_sender, &db_conn, expand))
            }
        };
    }
    drop(output_sender);
    // Start printer thread
    thread::spawn(move || loop_printer(output_receiver, done_sender).expect("printing to stdout"));

    let mut count = 0;
    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) => (),
            _ => row_sender.send(row),
        }
        count += 1;
        if count % 1000 == 0 {
            info!("processed {} lines...", count);
        }
    }
    drop(row_sender);
    done_receiver.recv();
    info!(
        "Done reading ({} lines), waiting for workers to exit...",
        count
    );
    Ok(())
}

fn run() -> 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))
        .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), \
            and outputs JSON (one entity per line). Database connection info read from environment \
            (DATABASE_URL, same as fatcatd).")
        .get_matches();

    let num_workers: usize = match m.value_of("workers") {
        Some(_) => value_t_or_exit!(m.value_of("workers"), usize),
        None => std::cmp::min(1, num_cpus::get() / 2) as usize,
    };
    let expand = match m.value_of("expand") {
        Some(s) => Some(ExpandFlags::from_str(&s)?),
        None => None,
    };
    let log_level = if m.is_present("quiet") {
        "warn"
    } else {
        "info"
    };
    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"),
    )
}

quick_main!(run);