migrate to a real connection pool for the sqlite connections

Author: syphar

Cargo.lock

@@ -39,6 +39,7 @@ semver = { version = "1.0.4", features = ["serde"] }
 slug = "0.1.1"
 r2d2 = "0.8"
 r2d2_postgres = "0.18"
+r2d2_sqlite = "0.21.0"
 url = { version = "2.1.1", features = ["serde"] }
 docsrs-metadata = { path = "crates/metadata" }
 anyhow = { version = "1.0.42", features = ["backtrace"]}
@@ -70,7 +71,7 @@ serde_cbor = "0.11.1"
 getrandom = "0.2.1"
 itertools = { version = "0.10.5", optional = true}
 rusqlite = { version = "0.28.0", features = ["bundled"] }
-lru = "0.9.0"
+moka = { version ="0.10.0", default-features = false, features = ["sync"]}
 
 # Async
 tokio = { version = "1.0", features = ["rt-multi-thread", "signal", "macros"] }

Cargo.toml

@@ -14,6 +14,9 @@ pub struct Config {
     pub(crate) max_pool_size: u32,
     pub(crate) min_pool_idle: u32,
 
+    // local pool for sqlite connections
+    pub(crate) max_sqlite_pool_size: u64,
+
     // Storage params
     pub(crate) storage_backend: StorageKind,
 
@@ -136,6 +139,7 @@ impl Config {
 
             database_url: require_env("DOCSRS_DATABASE_URL")?,
             max_pool_size: env("DOCSRS_MAX_POOL_SIZE", 90)?,
+            max_sqlite_pool_size: env("DOCSRS_MAX_SQLITE_POOL_SIZE", 500)?,
             min_pool_idle: env("DOCSRS_MIN_POOL_IDLE", 10)?,
 
             storage_backend: env("DOCSRS_STORAGE_BACKEND", StorageKind::Database)?,