X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/2ab1b540a710fd454f33e9ba22db601e67f3d217..e19efd044f4aa88af59f35f43c9b1118df36efc0:/services/ws/event_source.go

diff --git a/services/ws/event_source.go b/services/ws/event_source.go
index fe1876cc27..cfb828b2a5 100644
--- a/services/ws/event_source.go
+++ b/services/ws/event_source.go
@@ -1,3 +1,7 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
@@ -29,8 +33,9 @@ func (c pgConfig) ConnectionString() string {
 }
 
 type pgEventSource struct {
-	DataSource string
-	QueueSize  int
+	DataSource   string
+	MaxOpenConns int
+	QueueSize    int
 
 	db         *sql.DB
 	pqListener *pq.Listener
@@ -115,6 +120,10 @@ func (ps *pgEventSource) Run() {
 		logger(nil).WithError(err).Error("sql.Open failed")
 		return
 	}
+	if ps.MaxOpenConns <= 0 {
+		logger(nil).Warn("no database connection limit configured -- consider setting PostgresPool>0 in arvados-ws configuration file")
+	}
+	db.SetMaxOpenConns(ps.MaxOpenConns)
 	if err = db.Ping(); err != nil {
 		logger(nil).WithError(err).Error("db.Ping failed")
 		return
@@ -234,9 +243,17 @@ func (ps *pgEventSource) NewSink() eventSink {
 }
 
 func (ps *pgEventSource) DB() *sql.DB {
+	ps.WaitReady()
 	return ps.db
 }
 
+func (ps *pgEventSource) DBHealth() error {
+	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Second))
+	defer cancel()
+	var i int
+	return ps.db.QueryRowContext(ctx, "SELECT 1").Scan(&i)
+}
+
 func (ps *pgEventSource) DebugStatus() interface{} {
 	ps.mtx.Lock()
 	defer ps.mtx.Unlock()
@@ -252,6 +269,7 @@ func (ps *pgEventSource) DebugStatus() interface{} {
 		"QueueDelay":   stats.Duration(ps.lastQDelay),
 		"Sinks":        len(ps.sinks),
 		"SinksBlocked": blocked,
+		"DBStats":      ps.db.Stats(),
 	}
 }