Reclaim space from buffer after every request (#592)

* Reclaim space from buffer after every request

* Dont delete data actually

* Memory optimization

* Ok

* make memory configurable

* Fix tests

* fix test

* update total

* Reclaim buffer space once per request

* Fix tests

* fix reload test

* Fix test

* Postgres 18 broke something

* run on forks

Author: levkk

.github/workflows/ci.yml

@@ -1,6 +1,8 @@
 name: ci
 on:
   push:
+  pull_request:
+    types: [opened, synchronize, reopened]
 
 jobs:
   fmt:
@@ -89,6 +91,7 @@ jobs:
           fail_ci_if_error: true
   integration:
     runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 30
     env:
       LLVM_PROFILE_FILE: ${{ github.workspace }}/target/llvm-cov-target/profiles/pgdog-%p-%m.profraw
     steps:

Cargo.lock

@@ -1,14 +1,14 @@
 services:
   primary:
-    image: postgres:18
+    image: postgres:17
     environment:
       POSTGRES_PASSWORD: postgres
     volumes:
       - ./docker/primary.sh:/docker-entrypoint-initdb.d/setup.sh
     ports:
       - 45000:5432
   replica_1:
-    image: postgres:18
+    image: postgres:17
     environment:
       POSTGRES_PASSWORD: postgres
     volumes:
@@ -20,7 +20,7 @@ services:
     ports:
       - 45001:5432
   replica_2:
-    image: postgres:18
+    image: postgres:17
     environment:
       POSTGRES_PASSWORD: postgres
     volumes:

integration/load_balancer/docker-compose.yml

@@ -21,6 +21,10 @@ healthcheck_port = 8080
 tls_certificate = "integration/tls/cert.pem"
 tls_private_key = "integration/tls/key.pem"
 
+[memory]
+net_buffer = 8096
+message_buffer = 8096
+
 [rewrite]
 enabled = false
 shard_key = "ignore"

integration/pgdog.toml

@@ -28,4 +28,6 @@ async fn test_tls_enforced() {
 
     opts_tls.connect().await.unwrap();
     assert!(opts_notls.connect().await.is_err());
+    // Reset settings.
+    admin.execute("RELOAD").await.unwrap();
 }