From 4f76c630e9f448dcf8099e4bd68dacf0ef9e40e4 Mon Sep 17 00:00:00 2001
From: Roman Zeyde <me@romanzey.de>
Date: Mon, 27 Nov 2023 21:52:23 +0200
Subject: [PATCH] Use Option<> for 'db_log_dir' config

Following https://github.com/romanz/electrs/pull/959#discussion_r1405387423
---
 internal/config_specification.toml |  1 -
 src/config.rs                      |  2 +-
 src/db.rs                          | 25 +++++++++++++------------
 src/tracker.rs                     |  6 +++++-
 4 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/internal/config_specification.toml b/internal/config_specification.toml
index e539fdca7..75aad9bca 100644
--- a/internal/config_specification.toml
+++ b/internal/config_specification.toml
@@ -33,7 +33,6 @@ default = "\"./db\".into()"
 name = "db_log_dir"
 type = "std::path::PathBuf"
 doc = "Directory to store index database internal log (default: same as specified by `db_dir`)"
-default = "\"\".into()"
 
 [[param]]
 name = "daemon_dir"
diff --git a/src/config.rs b/src/config.rs
index d8d12a3ab..915ab9add 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -127,7 +127,7 @@ pub struct Config {
     // See below for the documentation of each field:
     pub network: Network,
     pub db_path: PathBuf,
-    pub db_log_dir: PathBuf,
+    pub db_log_dir: Option<PathBuf>,
     pub daemon_dir: PathBuf,
     pub daemon_auth: SensitiveAuth,
     pub daemon_rpc_addr: SocketAddr,
diff --git a/src/db.rs b/src/db.rs
index 5aa20026d..8d6c7583e 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -121,11 +121,13 @@ impl DBStore {
             .collect()
     }
 
-    fn open_internal(path: &Path, log_dir: &Path) -> Result<Self> {
+    fn open_internal(path: &Path, log_dir: Option<&Path>) -> Result<Self> {
         let mut db_opts = default_opts();
         db_opts.create_if_missing(true);
         db_opts.create_missing_column_families(true);
-        db_opts.set_db_log_dir(log_dir);
+        if let Some(d) = log_dir {
+            db_opts.set_db_log_dir(d);
+        }
 
         let db = rocksdb::DB::open_cf_descriptors(&db_opts, path, Self::create_cf_descriptors())
             .with_context(|| format!("failed to open DB: {}", path.display()))?;
@@ -153,7 +155,7 @@ impl DBStore {
     }
 
     /// Opens a new RocksDB at the specified location.
-    pub fn open(path: &Path, log_dir: &Path, auto_reindex: bool) -> Result<Self> {
+    pub fn open(path: &Path, log_dir: Option<&Path>, auto_reindex: bool) -> Result<Self> {
         let mut store = Self::open_internal(path, log_dir)?;
         let config = store.get_config();
         debug!("DB {:?}", config);
@@ -368,13 +370,13 @@ mod tests {
     fn test_reindex_new_format() {
         let dir = tempfile::tempdir().unwrap();
         {
-            let store = DBStore::open(dir.path(), dir.path(), false).unwrap();
+            let store = DBStore::open(dir.path(), None, false).unwrap();
             let mut config = store.get_config().unwrap();
             config.format += 1;
             store.set_config(config);
         };
         assert_eq!(
-            DBStore::open(dir.path(), dir.path(), false)
+            DBStore::open(dir.path(), None, false)
                 .err()
                 .unwrap()
                 .to_string(),
@@ -385,7 +387,7 @@ mod tests {
             )
         );
         {
-            let store = DBStore::open(dir.path(), dir.path(), true).unwrap();
+            let store = DBStore::open(dir.path(), None, true).unwrap();
             store.flush();
             let config = store.get_config().unwrap();
             assert_eq!(config.format, CURRENT_FORMAT);
@@ -403,14 +405,14 @@ mod tests {
             db.put(b"F", b"").unwrap(); // insert legacy DB compaction marker (in 'default' column family)
         };
         assert_eq!(
-            DBStore::open(dir.path(), dir.path(), false)
+            DBStore::open(dir.path(), None, false)
                 .err()
                 .unwrap()
                 .to_string(),
             format!("re-index required due to legacy format",)
         );
         {
-            let store = DBStore::open(dir.path(), dir.path(), true).unwrap();
+            let store = DBStore::open(dir.path(), None, true).unwrap();
             store.flush();
             let config = store.get_config().unwrap();
             assert_eq!(config.format, CURRENT_FORMAT);
@@ -420,7 +422,7 @@ mod tests {
     #[test]
     fn test_db_prefix_scan() {
         let dir = tempfile::tempdir().unwrap();
-        let store = DBStore::open(dir.path(), dir.path(), true).unwrap();
+        let store = DBStore::open(dir.path(), None, true).unwrap();
 
         let items: &[&[u8]] = &[
             b"ab",
@@ -452,8 +454,7 @@ mod tests {
     #[test]
     fn test_db_log_in_same_dir() {
         let dir1 = tempfile::tempdir().unwrap();
-        let empty = Path::new("");
-        let _store = DBStore::open(dir1.path(), &empty, true).unwrap();
+        let _store = DBStore::open(dir1.path(), None, true).unwrap();
 
         // LOG file is created in dir1
         let dir_files = list_log_files(dir1.path());
@@ -461,7 +462,7 @@ mod tests {
 
         let dir2 = tempfile::tempdir().unwrap();
         let dir3 = tempfile::tempdir().unwrap();
-        let _store = DBStore::open(dir2.path(), dir3.path(), true).unwrap();
+        let _store = DBStore::open(dir2.path(), Some(dir3.path()), true).unwrap();
 
         // *_LOG file is not created in dir2, but in dir3
         let dir_files = list_log_files(dir2.path());
diff --git a/src/tracker.rs b/src/tracker.rs
index 0abe7fc4e..9ed97f355 100644
--- a/src/tracker.rs
+++ b/src/tracker.rs
@@ -33,7 +33,11 @@ pub(crate) enum Error {
 
 impl Tracker {
     pub fn new(config: &Config, metrics: Metrics) -> Result<Self> {
-        let store = DBStore::open(&config.db_path, &config.db_log_dir, config.auto_reindex)?;
+        let store = DBStore::open(
+            &config.db_path,
+            config.db_log_dir.as_deref(),
+            config.auto_reindex,
+        )?;
         let chain = Chain::new(config.network);
         Ok(Self {
             index: Index::load(