scripts: increase relay pool and queue size

scripts/relay/.env.example

@@ -12,3 +12,7 @@ CHAT_REF=88df79d1e26921c7d1835fc8484fade596356fb6
 
 # GHC runtime options, without the +RTS/-RTS markers.
 #RELAY_RTS_OPTS="-N -F1.2 -A16m -I0.01 -Iw15"
+
+# Database connection pool and internal queue size.
+#RELAY_POOL_SIZE=4
+#RELAY_QUEUE_SIZE=65536

scripts/relay/docker-compose.yaml

@@ -14,7 +14,10 @@ services:
     environment:
       RELAY_NAME: ${RELAY_NAME}
       RELAY_WEB_DOMAIN: ${RELAY_WEB_DOMAIN}
-      RELAY_RTS_OPTS: ${RELAY_RTS_OPTS:-}    # empty: entrypoint default
+      # Empty values fall back to the entrypoint defaults.
+      RELAY_RTS_OPTS: ${RELAY_RTS_OPTS:-}
+      RELAY_POOL_SIZE: ${RELAY_POOL_SIZE:-}
+      RELAY_QUEUE_SIZE: ${RELAY_QUEUE_SIZE:-}
       # Password is passed as PGPASSWORD to keep it out of argv.
       DB_CONN: postgresql://${POSTGRES_USER}@db:5432/${POSTGRES_DB}
       PGPASSWORD: ${POSTGRES_PASSWORD}

scripts/relay/entrypoint.py

@@ -14,6 +14,8 @@ WEB_ROOT = "/var/www/relay-web-channels"
 ADDR_FILE = "/out/relay-address.txt"
 CAPTURE_TIMEOUT = 180  # seconds
 DEFAULT_RTS_OPTS = "-N -F1.2 -A16m -I0.01 -Iw15"
+DEFAULT_POOL_SIZE = "4"  # the binary defaults to a single connection
+DEFAULT_QUEUE_SIZE = "65536"
 
 
 def require(name):
@@ -88,6 +90,8 @@ def main():
         "--relay-web-interval", "30",
         "-d", conn,
         "--create-schema",
+        "--pool-size", os.environ.get("RELAY_POOL_SIZE") or DEFAULT_POOL_SIZE,
+        "--queue-size", os.environ.get("RELAY_QUEUE_SIZE") or DEFAULT_QUEUE_SIZE,
     ] + rts_args()
     os.execvp(relay[0], relay)