From b64903895bed4d530edf038d0ff9cb658f74db89 Mon Sep 17 00:00:00 2001
From: Andrew Whitehead <cywolf@gmail.com>
Date: Sat, 18 Mar 2023 10:49:00 -0700
Subject: [PATCH] use thread::available_parallelism instead of num_cpus crate

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>
---
 askar-storage/Cargo.toml                      |  3 +--
 askar-storage/src/backend/sqlite/provision.rs | 20 ++++++++++++-------
 askar-storage/tests/migration.rs              |  4 +++-
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/askar-storage/Cargo.toml b/askar-storage/Cargo.toml
index c29ede95..439efc80 100644
--- a/askar-storage/Cargo.toml
+++ b/askar-storage/Cargo.toml
@@ -22,7 +22,7 @@ all_backends = ["any", "postgres", "sqlite"]
 any = []
 migration = ["rmp-serde", "sqlx/macros"]
 postgres = ["sqlx", "sqlx/postgres", "sqlx/tls"]
-sqlite = ["num_cpus", "sqlx", "sqlx/sqlite"]
+sqlite = ["sqlx", "sqlx/sqlite"]
 pg_test = ["postgres"]
 
 [dev-dependencies]
@@ -41,7 +41,6 @@ hex = "0.4"
 hmac = "0.12"
 itertools = "0.10"
 log = { version = "0.4", optional = true }
-num_cpus = { version = "1.0", optional = true }
 once_cell = "1.5"
 percent-encoding = "2.0"
 rmp-serde = { version= "1.1", optional = true }
diff --git a/askar-storage/src/backend/sqlite/provision.rs b/askar-storage/src/backend/sqlite/provision.rs
index a0d9768a..de105e70 100644
--- a/askar-storage/src/backend/sqlite/provision.rs
+++ b/askar-storage/src/backend/sqlite/provision.rs
@@ -1,5 +1,6 @@
 use std::{
-    borrow::Cow, fs::remove_file, io::ErrorKind as IoErrorKind, str::FromStr, time::Duration,
+    borrow::Cow, fs::remove_file, io::ErrorKind as IoErrorKind, str::FromStr,
+    thread::available_parallelism, time::Duration,
 };
 
 use sqlx::{
@@ -22,9 +23,9 @@ use crate::{
     protect::{KeyCache, PassKey, StoreKeyMethod, StoreKeyReference},
 };
 
-const DEFAULT_MIN_CONNECTIONS: u32 = 1;
-const DEFAULT_LOWER_MAX_CONNECTIONS: u32 = 2;
-const DEFAULT_UPPER_MAX_CONNECTIONS: u32 = 8;
+const DEFAULT_MIN_CONNECTIONS: usize = 1;
+const DEFAULT_LOWER_MAX_CONNECTIONS: usize = 2;
+const DEFAULT_UPPER_MAX_CONNECTIONS: usize = 8;
 const DEFAULT_BUSY_TIMEOUT: Duration = Duration::from_secs(5);
 const DEFAULT_JOURNAL_MODE: SqliteJournalMode = SqliteJournalMode::Wal;
 const DEFAULT_LOCKING_MODE: SqliteLockingMode = SqliteLockingMode::Normal;
@@ -69,16 +70,21 @@ impl SqliteStoreOptions {
                 .parse()
                 .map_err(err_map!(Input, "Error parsing 'max_connections' parameter"))?
         } else {
-            (num_cpus::get() as u32)
+            available_parallelism()
+                .map_err(err_map!(
+                    Unexpected,
+                    "Error determining available parallelism"
+                ))?
+                .get()
                 .max(DEFAULT_LOWER_MAX_CONNECTIONS)
-                .min(DEFAULT_UPPER_MAX_CONNECTIONS)
+                .min(DEFAULT_UPPER_MAX_CONNECTIONS) as u32
         };
         let min_connections = if let Some(min_conn) = opts.query.remove("min_connections") {
             min_conn
                 .parse()
                 .map_err(err_map!(Input, "Error parsing 'min_connections' parameter"))?
         } else {
-            DEFAULT_MIN_CONNECTIONS
+            DEFAULT_MIN_CONNECTIONS as u32
         };
         let journal_mode = if let Some(mode) = opts.query.remove("journal_mode") {
             SqliteJournalMode::from_str(&mode)
diff --git a/askar-storage/tests/migration.rs b/askar-storage/tests/migration.rs
index 32df1411..102ee761 100644
--- a/askar-storage/tests/migration.rs
+++ b/askar-storage/tests/migration.rs
@@ -1,3 +1,5 @@
+#![cfg(all(feature = "sqlite", feature = "migration"))]
+
 use std::path::PathBuf;
 
 use askar_storage::future::block_on;
@@ -29,7 +31,7 @@ fn prepare_db() {
 }
 
 #[test]
-fn test_migration() {
+fn test_sqlite_migration() {
     prepare_db();
 
     let res = block_on(async {