Fork Sync: Update from parent repository (#3)

* improvement: use appropriate paths for systemd example

* improvement: add a configurable postgres write conn string

This adds a new configurable connection string for postgres writes.

* improvement: document pg connection_write config

* build: upgrade checkout action for github ci

* perf: use standard allocator, limit sqlite mmap to 4GB

This is an experimental change to see if we can reduce memory usage
with large SQLite databases.  If successful, we'll do this again and
further reduce the database mmap size.

This will cause greater use of the page cache, but that is more easily
reclaimed by the kernel, and should reduce memory pressure, as well as
making it clearer how much memory the application is actually using
for connections, subscriptions, etc.

* docs: reformatting

* docs: allow host header prefix matching, required for Damus compatibility

* perf: disable sqlite mmap to reduce memory pressure

* perf: switch to jemalloc allocator

* docs: helpful ubuntu packages for building

* perf: reduce SQLite connection count and idle lifetime

On lightly loaded relays, we free up memory faster by letting idle
connections be reclaimed in 10 seconds instead of the default 10
minutes.  This also sets the minimum to zero connections, instead of
always trying to hold one open.

---------

Co-authored-by: Petr Kracik <petrkr@petrkr.net>
Co-authored-by: Kieran <kieran@harkin.me>
Co-authored-by: Greg Heartsfield <scsibug@imap.cc>

README.md

@@ -93,6 +93,11 @@ https://hub.docker.com/r/scsibug/nostr-rs-relay
 
 Building `nostr-rs-relay` requires an installation of Cargo & Rust: https://www.rust-lang.org/tools/install
 
+The following OS packages will be helpful; on Debian/Ubuntu:
+```console
+$ sudo apt-get install build-essentials cmake protobuf-compiler pkg-config libssl-dev
+```
+
 Clone this repository, and then build a release version of the relay:
 
 ```console

config.toml

@@ -42,7 +42,7 @@ description = "A newly created nostr-rs-relay.\n\nCustomize this with your own i
 # Database connection pool settings for subscribers:
 
 # Minimum number of SQLite reader connections
-#min_conn = 4
+#min_conn = 0
 
 # Maximum number of SQLite reader connections.  Recommend setting this
 # to approx the number of cores.

docs/reverse-proxy.md

@@ -29,7 +29,7 @@ frontend fe_prod
     bind    :80
     http-request set-header X-Forwarded-Proto https if { ssl_fc }
     redirect scheme https code 301 if !{ ssl_fc }
-    acl host_relay hdr(host) -i relay.example.com
+    acl host_relay hdr(host) -i -m beg relay.example.com
     use_backend relay if host_relay
     # HSTS (1 year)
     http-response set-header Strict-Transport-Security max-age=31536000

src/main.rs

@@ -8,7 +8,6 @@ use std::sync::mpsc as syncmpsc;
 use std::sync::mpsc::{Receiver as MpscReceiver, Sender as MpscSender};
 use std::thread;
 use tracing::info;
-
 #[cfg(not(target_env = "msvc"))]
 use tikv_jemallocator::Jemalloc;
 

src/repo/sqlite.rs

@@ -62,7 +62,7 @@ impl SqliteRepo {
             "writer",
             settings,
             OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE,
-            1,
+            0,
             2,
             false,
         );
@@ -70,7 +70,7 @@ impl SqliteRepo {
             "maintenance",
             settings,
             OpenFlags::SQLITE_OPEN_READ_WRITE | OpenFlags::SQLITE_OPEN_CREATE,
-            1,
+            0,
             2,
             true,
         );
@@ -1199,6 +1199,7 @@ pub fn build_pool(
         .test_on_check_out(true) // no noticeable performance hit
         .min_idle(Some(min_size))
         .max_size(max_size)
+        .idle_timeout(Some(Duration::from_secs(10)))
         .max_lifetime(Some(Duration::from_secs(30)))
         .build(manager)
         .unwrap();

src/repo/sqlite_migration.rs

@@ -19,7 +19,7 @@ PRAGMA foreign_keys = ON;
 PRAGMA journal_size_limit = 32768;
 PRAGMA temp_store = 2; -- use memory, not temp files
 PRAGMA main.cache_size = 20000; -- 80MB max cache size per conn
-pragma mmap_size = 17179869184; -- cap mmap at 16GB
+pragma mmap_size = 0; -- disable mmap (default)
 "##;
 
 /// Latest database version