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main.go
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main.go
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// Copyright 2019 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/google/uuid"
"github.com/layer5io/meshery-istio/build"
"github.com/layer5io/meshery-istio/istio"
"github.com/layer5io/meshkit/logger"
"github.com/sirupsen/logrus"
// "github.com/layer5io/meshkit/tracing"
"github.com/layer5io/meshery-adapter-library/adapter"
"github.com/layer5io/meshery-adapter-library/api/grpc"
"github.com/layer5io/meshery-istio/internal/config"
"github.com/layer5io/meshery-istio/istio/oam"
configprovider "github.com/layer5io/meshkit/config/provider"
"github.com/layer5io/meshkit/utils/events"
)
var (
serviceName = "istio-adapter"
version = "edge"
gitsha = "none"
instanceID = uuid.NewString()
)
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 adaptor
func main() {
// Initialize Logger instance
logLevel := logrus.InfoLevel
if isDebug() {
logLevel = logrus.DebugLevel
}
log, err := logger.New(serviceName, logger.Options{
Format: logger.SyslogLogFormat,
LogLevel: int(logLevel),
})
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)
// }
ev := events.NewEventStreamer()
// Initialize Handler intance
handler := istio.New(cfg, log, kubeconfigHandler, ev)
handler = adapter.AddLogger(log, handler)
service.Handler = handler
service.EventStreamer = ev
service.StartedAt = time.Now()
service.Version = version
service.GitSHA = gitsha
go registerCapabilities(service.Port, log) //Registering static capabilities
go registerCapabilitiesDynamically(service.Port, log) //Registering latest capabilities periodically
// Server Initialization
log.Info("Adaptor Listening at port: ", service.Port)
err = grpc.Start(service)
if err != nil {
log.Error(err)
os.Exit(1)
}
}
func isDebug() bool {
return os.Getenv("DEBUG") == "true"
}
func mesheryServerAddress() string {
meshReg := os.Getenv("MESHERY_SERVER")
if meshReg != "" {
if strings.HasPrefix(meshReg, "http") {
return meshReg
}
return "http://" + meshReg
}
return "http://localhost:9081"
}
func serviceAddress() string {
svcAddr := os.Getenv("SERVICE_ADDR")
if svcAddr != "" {
return svcAddr
}
return "localhost"
}
func registerCapabilities(port string, log logger.Handler) {
err := oam.RegisterMeshModelComponents(instanceID, mesheryServerAddress(), serviceAddress(), port)
if err != nil {
log.Error(err)
}
log.Info("Successfully registered static components with Meshery Server.")
}
func registerCapabilitiesDynamically(port string, log logger.Handler) {
registerWorkloads(port, log)
//Start the ticker
const reRegisterAfter = 24
ticker := time.NewTicker(reRegisterAfter * time.Hour)
for {
<-ticker.C
registerWorkloads(port, log)
}
}
func registerWorkloads(port string, log logger.Handler) {
log.Info("Registering latest components with Meshery Server")
//First we create and store any new components if available
version := build.LatestVersion
url := build.DefaultGenerationURL
gm := build.DefaultGenerationMethod
// Prechecking to skip comp gen
if os.Getenv("FORCE_DYNAMIC_REG") != "true" && oam.AvailableVersions[version] {
log.Info("Components available statically for version ", version, ". Skipping dynamic component registeration")
return
}
//If a URL is passed from env variable, it will be used for component generation with default method being "using manifests"
// In case a helm chart URL is passed, COMP_GEN_METHOD env variable should be set to Helm otherwise the component generation fails
if os.Getenv("COMP_GEN_URL") != "" && (os.Getenv("COMP_GEN_METHOD") == "Helm" || os.Getenv("COMP_GEN_METHOD") == "Manifest") {
url = os.Getenv("COMP_GEN_URL")
gm = os.Getenv("COMP_GEN_METHOD")
log.Info("Registering workload components from url ", url, " using ", gm, " method...")
}
log.Info("Registering latest workload components for version ", version)
err := adapter.CreateComponents(adapter.StaticCompConfig{
URL: url,
Method: gm,
MeshModelPath: build.MeshModelPath,
MeshModelConfig: build.MeshModelConfig,
DirName: version,
Config: build.NewConfig(version),
})
if err != nil {
log.Info("Failed to generate components for version " + version)
log.Error(err)
return
}
// err := adapter.CreateComponents(adapter.StaticCompConfig{
// URL: url,
// Method: gm,
// MeshModelPath: build.MeshModelPath,
// MeshModelConfig: build.MeshModelConfig,
// DirName: version,
// Config: build.NewConfig(version),
// })
//The below log is checked in the workflows. If you change this log, reflect that change in the workflow where components are generated
log.Info("Component creation completed for version ", version)
//Now we will register in case
log.Info("Registering workloads with Meshery Server for version ", version)
if err := oam.RegisterMeshModelComponents(instanceID, mesheryServerAddress(), serviceAddress(), port); err != nil {
log.Error(err)
return
}
log.Info("Latest workload components successfully registered for version ", version)
}