make deployment container-ready

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:alpine AS builder
+WORKDIR /build
+ADD go.mod .
+COPY . .
+RUN go build 
+FROM alpine
+WORKDIR /build
+COPY --from=builder /build/wo-bisch-web /build/wo-bisch-web
+COPY snippets snippets
+COPY templates templates
+COPY static static
+CMD ["./wo-bisch-web"]
+EXPOSE 4000

helper.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"os"
 )
 
 // Contains tells whether a contains x.
@@ -18,3 +19,11 @@ func Contains(a []string, x string) bool {
 	}
 	return false
 }
+
+func getenv(key, fallback string) string {
+    value := os.Getenv(key)
+    if len(value) == 0 {
+        return fallback
+    }
+    return value
+}

main.go

@@ -136,6 +136,6 @@ func main() {
 	http.HandleFunc("/stripewebhook", stripeWebhookHandler)
 
 	logit("Starting Web Application...")
-	http.ListenAndServe("127.0.0.1:4000", nil)
+	http.ListenAndServe(":4000", nil)
 	logit("Terminating Web Application...")
 }

metrics.go

@@ -112,7 +112,7 @@ func metricsHandler(response http.ResponseWriter, request *http.Request) {
 			mystart = start[0]
 		}
 
-		url := "http://localhost:8086/api/v2/query?org=wobischorg"
+		url := getenv("INFLUX_URL", "http://localhost:8086/api/v2/query?org=wobischorg")
 		data := []byte(fmt.Sprintf(`from(bucket:"wobischbucket") 
                                          |> range(start: %s, stop: %s) 
                                          |> filter(fn: (r) => r._measurement == "measurement") 

persistence.go

@@ -26,7 +26,7 @@ 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())
 			}