From 24b8417ee7837134391b3373cf32bdb96409e1f2 Mon Sep 17 00:00:00 2001
From: Arlo Siemsen <arsiem@microsoft.com>
Date: Mon, 22 Aug 2022 13:12:36 -0500
Subject: [PATCH] Add tool to import from git index into the database

---
 src/admin/git_import.rs | 110 ++++++++++++++++++++++++++++++++++++++++
 src/admin/mod.rs        |   1 +
 src/bin/crates-admin.rs |   4 +-
 3 files changed, 114 insertions(+), 1 deletion(-)
 create mode 100644 src/admin/git_import.rs

diff --git a/src/admin/git_import.rs b/src/admin/git_import.rs
new file mode 100644
index 00000000000..955bbd23438
--- /dev/null
+++ b/src/admin/git_import.rs
@@ -0,0 +1,110 @@
+use std::{
+    fs::File,
+    io::{BufRead, BufReader},
+    thread,
+    time::Duration,
+};
+
+use anyhow::Context;
+use cargo_registry_index::{Repository, RepositoryConfig};
+use diesel::prelude::*;
+use indicatif::{ProgressBar, ProgressIterator, ProgressStyle};
+
+use crate::{
+    admin::dialoguer,
+    db,
+    schema::{crates, dependencies, versions},
+};
+
+#[derive(clap::Parser, Debug, Copy, Clone)]
+#[clap(
+    name = "git-import",
+    about = "Import missing fields from git into the database"
+)]
+pub struct Opts {
+    /// Time in milliseconds to sleep between crate updates to reduce database load.
+    #[clap(long)]
+    delay: u64,
+}
+
+pub fn run(opts: Opts) -> anyhow::Result<()> {
+    let conn = db::oneoff_connection().unwrap();
+    println!("fetching git repo");
+    let config = RepositoryConfig::from_environment();
+    let repo = Repository::open(&config)?;
+    repo.reset_head()?;
+    println!("HEAD is at {}", repo.head_oid()?);
+    let files = repo.get_files_modified_since(None)?;
+    println!("found {} crates", files.len());
+    if !dialoguer::confirm("continue?") {
+        return Ok(());
+    }
+
+    let pb = ProgressBar::new(files.len() as u64);
+    pb.set_style(ProgressStyle::with_template("{bar:60} ({pos}/{len}, ETA {eta})").unwrap());
+
+    for file in files.iter().progress_with(pb) {
+        thread::sleep(Duration::from_millis(opts.delay));
+        let crate_name = file.file_name().unwrap().to_str().unwrap();
+        let path = repo.index_file(crate_name);
+        if !path.exists() {
+            continue;
+        }
+        let file = File::open(path)?;
+        let reader = BufReader::new(file);
+        for line in reader.lines() {
+            let krate: cargo_registry_index::Crate = serde_json::from_str(&line?)?;
+            conn.transaction(|| {
+                import_data(&conn, &krate)
+                    .with_context(|| format!("failed to update crate: {krate:?}"))
+            })?;
+        }
+    }
+
+    Ok(())
+}
+
+fn import_data(conn: &PgConnection, krate: &cargo_registry_index::Crate) -> QueryResult<()> {
+    let version_id: i32 = versions::table
+        .inner_join(crates::table)
+        .filter(crates::name.eq(&krate.name))
+        .filter(versions::num.eq(&krate.vers))
+        .select(versions::id)
+        .first(conn)?;
+
+    // Update the `checksum` and `links` fields.
+    diesel::update(versions::table)
+        .set((
+            versions::checksum.eq(&krate.cksum),
+            versions::links.eq(&krate.links),
+        ))
+        .filter(versions::id.eq(version_id))
+        .execute(conn)?;
+    // Update the `explicit_name` field for each dependency.
+    for dep in &krate.deps {
+        if let Some(package) = &dep.package {
+            // This is a little tricky because there can be two identical deps in the
+            // database. The only difference in git is the field we're trying to
+            // fill (explicit_name). Using `first` here & filtering out existing `explicit_name`
+            // entries ensure that we assign one explicit_name to each dep.
+            let id: i32 = dependencies::table
+                .inner_join(crates::table)
+                .filter(dependencies::explicit_name.is_null())
+                .filter(dependencies::version_id.eq(version_id))
+                .filter(dependencies::req.eq(&dep.req))
+                .filter(dependencies::features.eq(&dep.features))
+                .filter(dependencies::optional.eq(&dep.optional))
+                .filter(dependencies::default_features.eq(&dep.default_features))
+                .filter(dependencies::target.is_not_distinct_from(&dep.target))
+                .filter(dependencies::kind.eq(dep.kind.map(|k| k as i32).unwrap_or_default()))
+                .filter(crates::name.eq(package))
+                .select(dependencies::id)
+                .first(conn)?;
+            diesel::update(dependencies::table)
+                .set(dependencies::explicit_name.eq(&dep.name))
+                .filter(dependencies::id.eq(id))
+                .execute(conn)?;
+        }
+    }
+    Ok(())
+}
diff --git a/src/admin/mod.rs b/src/admin/mod.rs
index f321adf5e23..2ab1c1fd1b5 100644
--- a/src/admin/mod.rs
+++ b/src/admin/mod.rs
@@ -1,6 +1,7 @@
 pub mod delete_crate;
 pub mod delete_version;
 pub mod dialoguer;
+pub mod git_import;
 pub mod migrate;
 pub mod on_call;
 pub mod populate;
diff --git a/src/bin/crates-admin.rs b/src/bin/crates-admin.rs
index fea3e29f601..7d793a3e7e4 100644
--- a/src/bin/crates-admin.rs
+++ b/src/bin/crates-admin.rs
@@ -1,7 +1,7 @@
 #![warn(clippy::all, rust_2018_idioms)]
 
 use cargo_registry::admin::{
-    delete_crate, delete_version, migrate, populate, render_readmes, test_pagerduty,
+    delete_crate, delete_version, git_import, migrate, populate, render_readmes, test_pagerduty,
     transfer_crates, upload_index, verify_token, yank_version,
 };
 
@@ -24,6 +24,7 @@ enum SubCommand {
     Migrate(migrate::Opts),
     UploadIndex(upload_index::Opts),
     YankVersion(yank_version::Opts),
+    GitImport(git_import::Opts),
 }
 
 fn main() -> anyhow::Result<()> {
@@ -42,6 +43,7 @@ fn main() -> anyhow::Result<()> {
         SubCommand::Migrate(opts) => migrate::run(opts)?,
         SubCommand::UploadIndex(opts) => upload_index::run(opts)?,
         SubCommand::YankVersion(opts) => yank_version::run(opts),
+        SubCommand::GitImport(opts) => git_import::run(opts)?,
     }
 
     Ok(())