server.go

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"

	"github.com/mbrukman/notebook/web/server/api"
	"github.com/mbrukman/notebook/web/server/db"
)

var (
	cwd, _  = os.Getwd()
	webRoot = flag.String("web-root", cwd, "Root of the web file tree.")
	host    = flag.String("host", "127.0.0.1", "By default, the server is only accessible via localhost. "+
		"Set to 0.0.0.0 or empty string to open to all.")
	port = flag.String("port", getEnvWithDefault("PORT", "8080"), "Port to listen on; $PORT env var overrides default value.")
)

func getEnvWithDefault(varName, defaultValue string) string {
	if value := os.Getenv(varName); value != "" {
		return value
	}
	return defaultValue
}

func main() {
	flag.Parse()

	apiHandler := api.NewApiHandler(*webRoot, db.NewInMemoryDatabase())
	http.HandleFunc("/", apiHandler.DispatchHandler)

	hostPort := fmt.Sprintf("%s:%s", *host, *port)
	log.Printf("Listening on http://%s", hostPort)
	log.Fatal(http.ListenAndServe(hostPort, nil))
}