From 04b00e0933c8623c89d99bf291303b24512cacd8 Mon Sep 17 00:00:00 2001
From: Corey Hulen <corey@hulen.com>
Date: Tue, 4 Jul 2017 00:01:23 -0700
Subject: Adding back ping retry (#6810)

---
 store/sql_supplier.go | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

(limited to 'store')

diff --git a/store/sql_supplier.go b/store/sql_supplier.go
index c062d0ff0..6f51cbd09 100644
--- a/store/sql_supplier.go
+++ b/store/sql_supplier.go
@@ -4,6 +4,7 @@
 package store
 
 import (
+	"context"
 	dbsql "database/sql"
 	"encoding/json"
 	"errors"
@@ -24,6 +25,8 @@ const (
 	INDEX_TYPE_FULL_TEXT = "full_text"
 	INDEX_TYPE_DEFAULT   = "default"
 	MAX_DB_CONN_LIFETIME = 60
+	DB_PING_ATTEMPTS     = 18
+	DB_PING_TIMEOUT_SECS = 10
 )
 
 const (
@@ -162,12 +165,23 @@ func setupConnection(con_type string, driver string, dataSource string, maxIdle
 		os.Exit(EXIT_DB_OPEN)
 	}
 
-	l4g.Info(utils.T("store.sql.pinging.info"), con_type)
-	err = db.Ping()
-	if err != nil {
-		l4g.Critical(utils.T("store.sql.ping.critical"), err)
-		time.Sleep(time.Second)
-		os.Exit(EXIT_PING)
+	for i := 0; i < DB_PING_ATTEMPTS; i++ {
+		l4g.Info("Pinging SQL %v database", con_type)
+		ctx, cancel := context.WithTimeout(context.Background(), DB_PING_TIMEOUT_SECS*time.Second)
+		defer cancel()
+		err = db.PingContext(ctx)
+		if err == nil {
+			break
+		} else {
+			if i == DB_PING_ATTEMPTS-1 {
+				l4g.Critical("Failed to ping DB, server will exit err=%v", err)
+				time.Sleep(time.Second)
+				os.Exit(EXIT_PING)
+			} else {
+				l4g.Error("Failed to ping DB retrying in %v seconds err=%v", DB_PING_TIMEOUT_SECS, err)
+				time.Sleep(DB_PING_TIMEOUT_SECS * time.Second)
+			}
+		}
 	}
 
 	db.SetMaxIdleConns(maxIdle)
-- 
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