/
main.go
237 lines (203 loc) · 6.31 KB
/
main.go
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
package main
import (
"context"
"fmt"
"github.com/orb-community/orb/agent/backend/otel"
"os"
"os/signal"
"strings"
"syscall"
"github.com/orb-community/orb/agent"
"github.com/orb-community/orb/agent/backend/diode"
"github.com/orb-community/orb/agent/backend/pktvisor"
"github.com/orb-community/orb/agent/config"
"github.com/orb-community/orb/buildinfo"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
const (
defaultConfig = "/opt/orb/agent.yaml"
)
var (
cfgFiles []string
Debug bool
)
func init() {
pktvisor.Register()
otel.Register()
diode.Register()
}
func Version(_ *cobra.Command, _ []string) {
fmt.Printf("orb-agent %s\n", buildinfo.GetVersion())
os.Exit(0)
}
func Run(_ *cobra.Command, _ []string) {
initConfig()
// configuration
var configData config.Config
err := viper.Unmarshal(&configData)
if err != nil {
cobra.CheckErr(fmt.Errorf("agent start up error (configData): %w", err))
os.Exit(1)
}
// logger
var logger *zap.Logger
atomicLevel := zap.NewAtomicLevel()
if Debug {
atomicLevel.SetLevel(zap.DebugLevel)
} else {
atomicLevel.SetLevel(zap.InfoLevel)
}
encoderCfg := zap.NewProductionEncoderConfig()
encoderCfg.EncodeTime = zapcore.ISO8601TimeEncoder
core := zapcore.NewCore(
zapcore.NewJSONEncoder(encoderCfg),
os.Stdout,
atomicLevel,
)
logger = zap.New(core, zap.AddCaller())
defer func(logger *zap.Logger) {
_ = logger.Sync()
}(logger)
// include pktvisor backend by default if binary is at default location
_, err = os.Stat(pktvisor.DefaultBinary)
logger.Info("backends loaded", zap.Any("backends", configData.OrbAgent.Backends))
if err == nil && configData.OrbAgent.Backends == nil {
logger.Info("no backends loaded, adding pktvisor as default")
configData.OrbAgent.Backends = make(map[string]map[string]string)
configData.OrbAgent.Backends["pktvisor"] = make(map[string]string)
configData.OrbAgent.Backends["pktvisor"]["binary"] = pktvisor.DefaultBinary
configData.OrbAgent.Backends["pktvisor"]["api_host"] = "localhost"
if _, ok := configData.OrbAgent.Backends["pktvisor"]["api_port"]; !ok {
configData.OrbAgent.Backends["pktvisor"]["api_port"] = "10853"
}
if len(cfgFiles) > 0 {
configData.OrbAgent.Backends["pktvisor"]["config_file"] = cfgFiles[0]
}
}
// new agent
a, err := agent.New(logger, configData)
if err != nil {
logger.Error("agent start up error", zap.Error(err))
os.Exit(1)
}
// handle signals
done := make(chan bool, 1)
rootCtx, cancelFunc := context.WithCancel(context.WithValue(context.Background(), "routine", "mainRoutine"))
go func() {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM, syscall.SIGKILL)
select {
case <-sigs:
logger.Warn("stop signal received stopping agent")
a.Stop(rootCtx)
cancelFunc()
case <-rootCtx.Done():
logger.Warn("mainRoutine context cancelled")
done <- true
return
}
}()
// start agent
err = a.Start(rootCtx, cancelFunc)
if err != nil {
logger.Error("agent startup error", zap.Error(err))
os.Exit(1)
}
<-done
}
func mergeOrError(path string) {
v := viper.New()
if len(path) > 0 {
v.SetConfigFile(path)
v.SetConfigType("yaml")
}
v.AutomaticEnv()
replacer := strings.NewReplacer(".", "_")
v.SetEnvKeyReplacer(replacer)
// note: viper seems to require a default (or a BindEnv) to be overridden by environment variables
v.SetDefault("orb.cloud.api.address", "https://orb.live")
v.SetDefault("orb.cloud.api.token", "")
v.SetDefault("orb.cloud.config.agent_name", "")
v.SetDefault("orb.cloud.config.auto_provision", true)
v.SetDefault("orb.cloud.mqtt.address", "tls://agents.orb.live:8883")
v.SetDefault("orb.cloud.mqtt.id", "")
v.SetDefault("orb.cloud.mqtt.key", "")
v.SetDefault("orb.cloud.mqtt.channel_id", "")
v.SetDefault("orb.db.file", "./orb-agent.db")
v.SetDefault("orb.tls.verify", true)
v.SetDefault("orb.otel.enable", true)
v.SetDefault("orb.otel.host", "localhost")
v.SetDefault("orb.otel.port", 0)
v.SetDefault("orb.debug.enable", Debug)
if len(path) > 0 {
cobra.CheckErr(v.ReadInConfig())
}
var fZero float64
// check that version of config files are all matched up
if versionNumber1 := viper.GetFloat64("version"); versionNumber1 != fZero {
versionNumber2 := v.GetFloat64("version")
if versionNumber2 == fZero {
cobra.CheckErr("Failed to parse config version in: " + path)
}
if versionNumber2 != versionNumber1 {
cobra.CheckErr("Config file version mismatch in: " + path)
}
}
// load backend static functions for setting up default values
backendVarsFunction := make(map[string]func(*viper.Viper))
backendVarsFunction["pktvisor"] = pktvisor.RegisterBackendSpecificVariables
backendVarsFunction["otel"] = otel.RegisterBackendSpecificVariables
// check if backends are configured
// if not then add pktvisor as default
if len(path) > 0 && len(v.GetStringMap("orb.backends")) == 0 {
pktvisor.RegisterBackendSpecificVariables(v)
} else {
for backendName := range v.GetStringMap("orb.backends") {
if backend := v.GetStringMap("orb.backends." + backendName); backend != nil {
backendVarsFunction[backendName](v)
}
}
}
cobra.CheckErr(viper.MergeConfigMap(v.AllSettings()))
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
// set defaults first
mergeOrError("")
if len(cfgFiles) == 0 {
if _, err := os.Stat(defaultConfig); !os.IsNotExist(err) {
mergeOrError(defaultConfig)
}
} else {
for _, conf := range cfgFiles {
mergeOrError(conf)
}
}
}
func main() {
rootCmd := &cobra.Command{
Use: "orb-agent",
}
versionCmd := &cobra.Command{
Use: "version",
Short: "Show agent version",
Run: Version,
}
runCmd := &cobra.Command{
Use: "run",
Short: "Run orb-agent and connect to Orb control plane",
Long: `Run orb-agent and connect to Orb control plane`,
Run: Run,
}
runCmd.Flags().StringSliceVarP(&cfgFiles, "config", "c", []string{}, "Path to config files (may be specified multiple times)")
runCmd.PersistentFlags().BoolVarP(&Debug, "debug", "d", false, "Enable verbose (debug level) output")
rootCmd.AddCommand(runCmd)
rootCmd.AddCommand(versionCmd)
_ = rootCmd.Execute()
}