main.go

// Copyright 2021 Layer5.io
//
// 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 (
	"fmt"
	"os"
	"path"
	"strings"
	"time"

	"github.com/layer5io/meshery-nsm/nsm"
	"github.com/layer5io/meshkit/logger"
	"github.com/layer5io/meshkit/utils/events"

	// "github.com/layer5io/meshkit/tracing"
	"github.com/layer5io/meshery-adapter-library/adapter"
	"github.com/layer5io/meshery-adapter-library/api/grpc"
	configprovider "github.com/layer5io/meshery-adapter-library/config/provider"
	"github.com/layer5io/meshery-nsm/internal/config"
)

var (
	serviceName = "nsm-adapter"
	version     = "edge"
	gitsha      = "none"
)

func init() {
	// Create the config path if it doesn't exists as the entire adapter
	// expects that directory to exists, which may or may not be true
	if err := os.MkdirAll(path.Join(config.RootPath(), "bin"), 0750); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

// main is the entrypoint of the adapter
func main() {
	// Initialize Logger instance
	log, err := logger.New(serviceName, logger.Options{
		Format:     logger.SyslogLogFormat,
		DebugLevel: isDebugLog(),
	})
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	err = os.Setenv("KUBECONFIG", path.Join(
		config.KubeConfig[configprovider.FilePath],
		fmt.Sprintf("%s.%s", config.KubeConfig[configprovider.FileName], config.KubeConfig[configprovider.FileType])),
	)

	if err != nil {
		// Fail silently
		log.Warn(err)
	}

	// Initialize application specific configs and dependencies
	// App and request config
	cfg, err := config.New(configprovider.ViperKey)
	if err != nil {
		log.Error(err)
		os.Exit(1)
	}

	service := &grpc.Service{}
	err = cfg.GetObject(adapter.ServerKey, service)
	if err != nil {
		log.Error(err)
		os.Exit(1)
	}

	kubeconfigHandler, err := config.NewKubeconfigBuilder(configprovider.ViperKey)
	if err != nil {
		log.Error(err)
		os.Exit(1)
	}

	// // Initialize Tracing instance
	// tracer, err := tracing.New(service.Name, service.TraceURL)
	// if err != nil {
	//      log.Err("Tracing Init Failed", err.Error())
	//      os.Exit(1)
	// }

	// Initialize Handler intance
	e := events.NewEventStreamer()
	handler := nsm.New(cfg, log, kubeconfigHandler, e)
	handler = adapter.AddLogger(log, handler)
	service.EventStreamer = e
	service.Handler = handler
	service.StartedAt = time.Now()
	service.Version = version
	service.GitSHA = gitsha

	// Server Initialization
	log.Info("Adaptor Listening at port: ", service.Port)
	err = grpc.Start(service, nil)
	if err != nil {
		log.Error(err)
		os.Exit(1)
	}
}

// isDebugLog returns true when DEBUG=true env var
func isDebugLog() bool {
	return strings.ToLower(os.Getenv("DEBUG")) == "true"
}