Docker working again, config working again

Author: pauljamescleary

Dockerfile

@@ -24,6 +24,7 @@ FROM alpine
 # Copy our static executable.
 RUN apk update && apk add --no-cache  vips-dev
 COPY --from=builder /go/bin/app /go/bin/app
+COPY --from=builder /src/app/cmd/config.yaml /go/bin
 
 # Run the hello binary.
-ENTRYPOINT ["/go/bin/app"]
+ENTRYPOINT ["/go/bin/app", "-configpath=/go/bin/config.yaml"]

Taskfile.yaml

@@ -7,6 +7,7 @@ tasks:
   build:
     cmds:
       - mkdir -p out/bin
+      - cp cmd/config.yaml out/bin
       - go build -mod vendor -o out/bin/gomin cmd/main.go
 
   clean:
@@ -44,7 +45,7 @@ tasks:
   server.run:
     deps: [db.migrate,build]
     cmds:
-      - ./out/bin/gomin
+      - ./out/bin/gomin -configpath "{{ .TASKFILE_DIR }}/out/bin/config.yaml"
     env:
       APP_DB_URL: "postgres://test:test@localhost:5435/gomin"
       APP_PORT: 1323

cmd/config.yaml

@@ -0,0 +1,2 @@
+PORT: 1323
+DB_URL: postgres://test:test@localhost:5435/gomin

cmd/config.yml

@@ -26,5 +26,7 @@ services:
       - '1323:1323'
     restart: always
     environment:
+      # Must be prefixed with APP_
+      # See pkg/common/config/config.go and viper for more details
       - APP_DB_URL=postgres://test:test@gomin_db:5432/gomin
       - APP_PORT=1323

docker-compose.yaml

@@ -1,26 +1,47 @@
 package config
 
 import (
+	"flag"
+	"os"
+
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 )
 
 type Config struct {
-	Port  string `mapstructure:"PORT"`
+	Port  int    `mapstructure:"PORT"`
 	DbUrl string `mapstructure:"DB_URL"`
 }
 
 func LoadConfig() (c Config, err error) {
-	viper.SetConfigType("env")
+	// Assumes a configpath Flag passed into our application
+	configPath := flag.String("configpath", "", "Config Path")
+	flag.Parse()
+	if configPath == nil || len(*configPath) == 0 {
+		log.Fatal().Msgf("Unable to load config path. Empty Path specified. ")
+	}
+	if _, err := os.Stat(*configPath); os.IsNotExist(err) {
+		// path/to/whatever does not exist
+		log.Fatal().Msgf("Unable to load config path. Path not found. ")
+	}
+
+	// Actually load in the config file from the path provided
+	viper.SetConfigFile(*configPath)
+	viper.SetConfigType("yaml")
+
+	// Enable overriding with environment variables, useful for docker
 	viper.SetEnvPrefix("APP")
 	viper.AutomaticEnv()
 
 	err = viper.ReadInConfig()
-
 	if err != nil {
 		return
 	}
 
+	// Unmarshal the config into the Config struct above
 	err = viper.Unmarshal(&c)
-
+	if err != nil {
+		log.Fatal().Msgf("unable to decode into struct, %v", err)
+	}
 	return
 }