Use env for config instead of flags

.env

@@ -0,0 +1,2 @@
+DBPATH=/tmp/badger
+NATS=nats://localhost:4222

Dockerfile

@@ -3,7 +3,7 @@ FROM golang:1.11-rc-alpine as build
 RUN apk add --no-cache git=2.18.1-r0
 
 WORKDIR /src
-COPY go.mod go.sum *.go ./
+COPY go.mod go.sum .env *.go ./
 RUN go get -d -v ./...
 RUN CGO_ENABLED=0 go build -ldflags "-s -w"
 RUN mkdir -p /tmp/badger
@@ -12,5 +12,6 @@ FROM scratch
 
 COPY --from=build /src/store /store
 COPY --from=build /tmp/badger /tmp/badger
+COPY --from=build /src/.env /.env
 
 ENTRYPOINT ["/store"]

README.md

@@ -2,6 +2,15 @@
 
 Single Badger store to serve bite, transcription and any others. Is kinda bite-centric, so required values revolve around a Bite. Transacts through NATS.
 
+## Environment Variables
+
+Supply environment variables by either exporting them or editing ```.env```.
+
+| ENV | Description | Default |
+| ---- | ----------- | ------- |
+| DBPATH | Path to store badger files in. Please make sure it exists. | /tmp/badger |
+| NATS | Host and port of nats | nats://localhost:4222 |
+
 ## Key format
 
 Takes in three variables: ```type```, ```key``` and ```start```. Type is the type of data to be inserted, e.g. ```bite```, ```bite_user``` or ```transcription```. Key could be some secret passphrase declaring you the Raj of British India for all I know. Start is the Epoch timestamp of the start of the Bite.

go.mod

@@ -5,6 +5,7 @@ require (
 	github.com/dgraph-io/badger v1.5.4
 	github.com/dgryski/go-farm v0.0.0-20190104051053-3adb47b1fb0f // indirect
 	github.com/golang/protobuf v1.2.1-0.20190205222052-c823c79ea157
+	github.com/joho/godotenv v1.3.0
 	github.com/nats-io/gnatsd v1.4.1 // indirect
 	github.com/nats-io/go-nats v1.7.0
 	github.com/nats-io/nkeys v0.0.2 // indirect

go.sum

@@ -6,10 +6,10 @@ github.com/dgraph-io/badger v1.5.4 h1:gVTrpUTbbr/T24uvoCaqY2KSHfNLVGm0w+hbee2HMe
 github.com/dgraph-io/badger v1.5.4/go.mod h1:VZxzAIRPHRVNRKRo6AXrX9BJegn6il06VMTZVJYCIjQ=
 github.com/dgryski/go-farm v0.0.0-20190104051053-3adb47b1fb0f h1:dDxpBYafY/GYpcl+LS4Bn3ziLPuEdGRkRjYAbSlWxSA=
 github.com/dgryski/go-farm v0.0.0-20190104051053-3adb47b1fb0f/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.2.1-0.20190205222052-c823c79ea157 h1:SdQMHsZ18/XZCHuwt3IF+dvHgYTO2XMWZjv3XBKQqAI=
 github.com/golang/protobuf v1.2.1-0.20190205222052-c823c79ea157/go.mod h1:Qd/q+1AKNOZr9uGQzbzCmRO6sUih6GTPZv6a1/R87v0=
+github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
+github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
 github.com/nats-io/gnatsd v1.4.1 h1:RconcfDeWpKCD6QIIwiVFcvForlXpWeJP7i5/lDLy44=
 github.com/nats-io/gnatsd v1.4.1/go.mod h1:nqco77VO78hLCJpIcVfygDP2rPGfsEHkGTUk94uh5DQ=
 github.com/nats-io/go-nats v1.7.0 h1:oQOfHcLr8hb43QG8yeVyY2jtarIaTjOv41CGdF3tTvQ=

main.go

@@ -2,10 +2,11 @@ package main
 
 import (
   "encoding/json"
-  "flag"
   "log"
   "net/http"
+  "os"
 
+  "github.com/joho/godotenv"
   "github.com/dgraph-io/badger"
   "github.com/nats-io/go-nats"
   "github.com/golang/protobuf/proto"
@@ -18,17 +19,19 @@ var db *badger.DB
 var nc *nats.Conn
 
 func main() {
-  // Parse flags
-  flag.StringVar(&dbPath, "dbpath", "/tmp/badger", "path to store data")
-  flag.StringVar(&natsHost, "nats", "nats://localhost:4222", "host and port of NATS")
-	flag.Parse()
+  // Load .env
+  err := godotenv.Load()
+  if err != nil {
+    log.Fatal("Error loading .env file")
+  }
+  dbPath = os.Getenv("DBPATH")
+  natsHost = os.Getenv("NATS")
 
   // Open badger
 	log.Printf("starting badger at %s", dbPath)
 	opts := badger.DefaultOptions
 	opts.Dir = dbPath
 	opts.ValueDir = dbPath
-	var err error
 	db, err = badger.Open(opts)
 	if err != nil {
 		log.Fatal(err)