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main.go
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main.go
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//
// Copyright (c) 2015 The heketi Authors
//
// 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 (
"encoding/json"
"flag"
"fmt"
"github.com/codegangsta/negroni"
"github.com/gorilla/mux"
"github.com/heketi/heketi/apps"
"github.com/heketi/heketi/apps/glusterfs"
"github.com/heketi/heketi/middleware"
"net/http"
"os"
"os/signal"
"syscall"
)
type Config struct {
Port string `json:"port"`
AuthEnabled bool `json:"use_auth"`
JwtConfig middleware.JwtAuthConfig `json:"jwt"`
}
var (
HEKETI_VERSION = "(dev)"
configfile string
showVersion bool
)
func init() {
flag.StringVar(&configfile, "config", "", "Configuration file")
flag.BoolVar(&showVersion, "version", false, "Show version")
}
func printVersion() {
fmt.Printf("Heketi %v\n", HEKETI_VERSION)
}
func setWithEnvVariables(options *Config) {
// Check for user key
env := os.Getenv("HEKETI_USER_KEY")
if "" != env {
options.AuthEnabled = true
options.JwtConfig.User.PrivateKey = env
}
// Check for user key
env = os.Getenv("HEKETI_ADMIN_KEY")
if "" != env {
options.AuthEnabled = true
options.JwtConfig.Admin.PrivateKey = env
}
// Check for user key
env = os.Getenv("HEKETI_HTTP_PORT")
if "" != env {
options.Port = env
}
}
func main() {
flag.Parse()
printVersion()
// Quit here if all we needed to do was show version
if showVersion {
return
}
// Check configuration file was given
if configfile == "" {
fmt.Fprintln(os.Stderr, "Please provide configuration file")
os.Exit(1)
}
// Read configuration
fp, err := os.Open(configfile)
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: Unable to open config file %v: %v\n",
configfile,
err.Error())
os.Exit(1)
}
defer fp.Close()
configParser := json.NewDecoder(fp)
var options Config
if err = configParser.Decode(&options); err != nil {
fmt.Fprintf(os.Stderr, "ERROR: Unable to parse %v: %v\n",
configfile,
err.Error())
os.Exit(1)
}
// Substitue values using any set environment variables
setWithEnvVariables(&options)
// Go to the beginning of the file when we pass it
// to the application
fp.Seek(0, os.SEEK_SET)
// Setup a new GlusterFS application
var app apps.Application
glusterfsApp := glusterfs.NewApp(fp)
if glusterfsApp == nil {
fmt.Fprintln(os.Stderr, "ERROR: Unable to start application")
os.Exit(1)
}
app = glusterfsApp
// Create a router and do not allow any routes
// unless defined.
router := mux.NewRouter().StrictSlash(true)
err = app.SetRoutes(router)
if err != nil {
fmt.Fprintln(os.Stderr, "ERROR: Unable to create http server endpoints")
os.Exit(1)
}
// Use negroni to add middleware. Here we add two
// middlewares: Recovery and Logger, which come with
// Negroni
n := negroni.New(negroni.NewRecovery(), negroni.NewLogger())
// Load authorization JWT middleware
if options.AuthEnabled {
jwtauth := middleware.NewJwtAuth(&options.JwtConfig)
if jwtauth == nil {
fmt.Fprintln(os.Stderr, "ERROR: Missing JWT information in config file")
os.Exit(1)
}
// Add Token parser
n.Use(jwtauth)
// Add application middleware check
n.UseFunc(app.Auth)
fmt.Println("Authorization loaded")
}
// Setup routes
n.UseHandler(router)
// Shutdown on CTRL-C signal
// For a better cleanup, we should shutdown the server and
signalch := make(chan os.Signal, 1)
signal.Notify(signalch, os.Interrupt, os.Kill, syscall.SIGINT, syscall.SIGTERM)
// Create a channel to know if the server was unable to start
done := make(chan bool)
go func() {
// Start the server.
fmt.Printf("Listening on port %v\n", options.Port)
err = http.ListenAndServe(":"+options.Port, n)
if err != nil {
fmt.Printf("ERROR: HTTP Server error: %v\n", err)
}
done <- true
}()
// Block here for signals and errors from the HTTP server
select {
case <-signalch:
case <-done:
}
fmt.Printf("Shutting down...\n")
// Shutdown the application
// :TODO: Need to shutdown the server
app.Close()
}