From 7a7cb8d64e4f5cb2865e381bd4bad21d96f8c50c Mon Sep 17 00:00:00 2001
From: Joerg Lehmann <joerg.lehmann@nbit.ch>
Date: Wed, 20 Jul 2022 18:14:51 +0200
Subject: [PATCH] module support, make container ready

---
 go.mod         |  5 +++++
 go.sum         | 12 ++++++++++++
 persistence.go | 11 ++++++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 go.mod
 create mode 100644 go.sum

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..ff8e457
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module nbit.ch/mini-beieli-lorahandler/v2
+
+go 1.17
+
+require github.com/gomodule/redigo v1.8.9
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..6c8a5ca
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gomodule/redigo v1.8.9 h1:Sl3u+2BI/kk+VEatbj0scLdrFhjPmbxOc1myhDP41ws=
+github.com/gomodule/redigo v1.8.9/go.mod h1:7ArFNvsTjH8GMMzB4uy1snslv2BwmginuMs06a1uzZE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/persistence.go b/persistence.go
index a36ec08..45e5143 100644
--- a/persistence.go
+++ b/persistence.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"github.com/gomodule/redigo/redis"
+	"os"
 	"strconv"
 	"time"
 )
@@ -12,6 +13,14 @@ var globalPool *redis.Pool
 const lastvaluesPrefix string = "lastvalues:"
 const devPrefix string = "dev:"
 
+func getenv(key, fallback string) string {
+	value := os.Getenv(key)
+	if len(value) == 0 {
+		return fallback
+	}
+	return value
+}
+
 type CalSettings struct {
 	w1_0 int32
 	w2_0 int32
@@ -28,7 +37,7 @@ func newPool() *redis.Pool {
 		// Dial is an application supplied function for creating and
 		// configuring a connection.
 		Dial: func() (redis.Conn, error) {
-			c, err := redis.Dial("tcp", ":6379")
+			c, err := redis.Dial("tcp", getenv("REDIS_CONNECTION_STRING", ":6379"))
 			if err != nil {
 				panic(err.Error())
 			}