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|
use anyhow::{bail, Context, Result};
use clap::{value_parser, ArgAction, Parser};
use futures::{stream, FutureExt, StreamExt};
use lambo::config::Config;
use sqlx::sqlite::SqlitePoolOptions;
use std::{fs, path::PathBuf};
use stderrlog::StdErrLog;
#[derive(Debug, Parser)]
struct Args {
/// The path to the lambo configuration file.
config_path: PathBuf,
/// The path to the CSV file, as exported from Canvas's gradebook.
csv_path: PathBuf,
/// Decreases the log level.
#[clap(
short,
long,
conflicts_with("verbose"),
action = ArgAction::Count,
value_parser = value_parser!(u8).range(..=2)
)]
quiet: u8,
/// Increases the log level.
#[clap(
short,
long,
conflicts_with("quiet"),
action = ArgAction::Count,
value_parser = value_parser!(u8).range(..=3)
)]
verbose: u8,
}
#[tokio::main]
async fn main() -> Result<()> {
// Parse the arguments.
let args = Args::parse();
// Set up logging.
{
let mut logger = StdErrLog::new();
match args.quiet {
0 => logger.verbosity(1 + args.verbose as usize),
1 => logger.verbosity(0),
2 => logger.quiet(true),
// UNREACHABLE: A maximum of two occurrences of quiet are allowed.
_ => unreachable!(),
};
// UNWRAP: No other logger should be set up.
logger.show_module_names(true).init().unwrap()
}
// Parse the config file.
let config = Config::read_from_file(&args.config_path)?;
// Connect to the database.
let db = SqlitePoolOptions::new()
.connect(&config.database_url)
.await
.with_context(|| format!("failed to connect to database at {:?}", config.database_url))?;
// Run any necessary migrations.
sqlx::migrate!().run(&db).await.with_context(|| {
format!(
"failed to run migrations on database at {:?}",
config.database_url
)
})?;
// Read the CSV file.
let csv_string = fs::read_to_string(&args.csv_path)
.with_context(|| format!("failed to read {:?}", args.csv_path))?;
// Skip the first two lines; Canvas puts two lines of headers in...
let (i, _) = csv_string
.match_indices('\n')
.nth(1)
.context("invalid CSV file (not enough lines)")?;
let csv_string = &csv_string[i..];
// Parse the CSV file.
let mut csv = csv::ReaderBuilder::new()
.has_headers(false)
.from_reader(csv_string.as_bytes())
.records()
.collect::<Result<Vec<_>, _>>()
.with_context(|| format!("failed to parse {:?}", args.csv_path))?;
// Remove the test student.
csv.retain(|record| &record[0] != "Student, Test");
// Collect all the X.500s, checking that they were of the right form.
let x500s = csv
.into_iter()
.map(|record| {
let email = &record[3];
if let Some(x500) = email.strip_suffix("@umn.edu") {
Ok(x500.to_lowercase())
} else {
bail!("not a valid UMN email: {:?}", email)
}
})
.collect::<Result<Vec<_>>>()?;
// Insert them all in the database.
//
// Looks like sqlx doesn't actually have bulk insert? WTF?
//
// https://github.com/launchbadge/sqlx/issues/294
let db = &db;
let errors = stream::iter(x500s)
.map(|x500| async move {
sqlx::query!(
"INSERT OR IGNORE INTO student_x500s (x500) VALUES (?)",
x500
)
.execute(db)
.await
.context("failed to insert X.500s")
})
.filter_map(|future| future.map(|r| r.err()))
.collect::<Vec<_>>()
.await;
if !errors.is_empty() {
log::error!("encountered {} errors:", errors.len());
for error in errors {
log::error!("{:?}", error);
}
bail!("failed to insert X.500s")
}
// Count the number of X.500s.
let x500_count = sqlx::query!("SELECT COUNT(x500) as count from student_x500s")
.fetch_one(db)
.await
.context("failed to get a count of X.500s")?;
log::info!("We now have {} student X.500s", x500_count.count);
Ok(())
}
|
