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run.go
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run.go
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package worker
import (
"errors"
"fmt"
"github.com/cirruslabs/cirrus-cli/internal/worker"
"github.com/dustin/go-humanize"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"gopkg.in/natefinch/lumberjack.v2"
"io"
"os"
"strings"
)
var ErrRun = errors.New("run failed")
var (
configPath string
name string
token string
labels map[string]string
// RPC-related variables.
rpcEndpointAddress string
// Logging-related variables.
logLevel string
logFile string
logRotateSize string
logMaxRotations uint
)
func loggingLevelsExplainer() string {
var levels []string
for _, level := range logrus.AllLevels {
levels = append(levels, `"`+level.String()+`"`)
}
if len(levels) == 0 {
panic("logging library reports no logging levels to use, this shouldn't normally happen; " +
"please submit an issue to https://github.com/cirruslabs/cirrus-cli/issues/new")
}
if len(levels) == 1 {
return fmt.Sprintf("for example %s", levels[0])
}
return fmt.Sprintf("either %s or %s", strings.Join(levels[:len(levels)-1], ", "), levels[len(levels)-1])
}
func run(cmd *cobra.Command, args []string) error {
if configPath != "" {
viper.SetConfigType("yaml")
viper.SetConfigFile(configPath)
if err := viper.ReadInConfig(); err != nil {
return err
}
}
opts := []worker.Option{
worker.WithName(viper.GetString("name")),
worker.WithRegistrationToken(viper.GetString("token")),
worker.WithLabels(viper.GetStringMapString("labels")),
}
// Configure RPC server (used for testing)
if rpcEndpointAddress != "" {
opts = append(opts, worker.WithRPCEndpoint(rpcEndpointAddress))
}
// Configure logging
logger := logrus.New()
level, err := logrus.ParseLevel(viper.GetString("log.level"))
if err != nil {
return err
}
logger.SetLevel(level)
var output io.Writer
if viper.IsSet("log.file") {
logRotateSizeBytes := uint64(0)
if viper.IsSet("log.rotate-size") {
logRotateSizeBytes, err = humanize.ParseBytes(viper.GetString("log.rotate-size"))
if err != nil {
return fmt.Errorf("failed to parse log size for rotation: %w", err)
}
}
output = &lumberjack.Logger{
Filename: viper.GetString("log.file"),
MaxSize: int(logRotateSizeBytes / humanize.MByte),
MaxBackups: int(viper.GetUint("log.max-rotations")),
}
} else {
output = cmd.ErrOrStderr()
}
logger.SetOutput(output)
opts = append(opts, worker.WithLogger(logger))
// Instantiate worker
worker, err := worker.New(opts...)
if err != nil {
return err
}
if err := worker.Run(cmd.Context()); err != nil {
return fmt.Errorf("%w: %v", ErrRun, err)
}
return nil
}
func NewRunCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "run",
Short: "Run persistent worker",
RunE: run,
}
cmd.PersistentFlags().StringVarP(&configPath, "file", "f", "", "configuration file path (e.g. /etc/cirrus/worker.yml)")
// Default worker name to host name
defaultName, _ := os.Hostname()
// Make the default name pretty by removing common suffixes
defaultName = strings.TrimSuffix(defaultName, ".lan")
defaultName = strings.TrimSuffix(defaultName, ".local")
cmd.PersistentFlags().StringVar(&name, "name", defaultName, "worker name to use when registering in the pool")
_ = viper.BindPFlag("name", cmd.PersistentFlags().Lookup("name"))
cmd.PersistentFlags().StringVar(&token, "token", "", "pool registration token")
_ = viper.BindPFlag("token", cmd.PersistentFlags().Lookup("token"))
cmd.PersistentFlags().StringToStringVar(&labels, "labels", map[string]string{},
"additional labels to use (e.g. --labels distro=debian)")
_ = viper.BindPFlag("labels", cmd.PersistentFlags().Lookup("labels"))
// RPC-related variables
cmd.PersistentFlags().StringVar(&rpcEndpointAddress, "rpc-endpoint", worker.DefaultRPCEndpoint, "RPC endpoint address")
_ = viper.BindPFlag("rpc.endpoint", cmd.PersistentFlags().Lookup("rpc-endpoint"))
_ = cmd.PersistentFlags().MarkHidden("rpc-endpoint")
// Logging-related variables
cmd.PersistentFlags().StringVar(&logLevel, "log-level", logrus.InfoLevel.String(),
fmt.Sprintf("logging level to use, %s", loggingLevelsExplainer()))
_ = viper.BindPFlag("log.level", cmd.PersistentFlags().Lookup("log-level"))
_ = cmd.PersistentFlags().MarkHidden("log-level")
cmd.PersistentFlags().StringVar(&logFile, "log-file", "", "log to the specified file instead of terminal")
_ = viper.BindPFlag("log.file", cmd.PersistentFlags().Lookup("log-file"))
_ = cmd.PersistentFlags().MarkHidden("log-file")
cmd.PersistentFlags().StringVar(&logRotateSize, "log-rotate-size", "",
"rotate the log file if it reaches the specified size, e.g. \"640 KB\" or \"100 MiB\"")
_ = viper.BindPFlag("log.rotate-size", cmd.PersistentFlags().Lookup("log-rotate-size"))
_ = cmd.PersistentFlags().MarkHidden("log-rotate-size")
cmd.PersistentFlags().UintVar(&logMaxRotations, "log-max-rotations", 0,
"how many already rotated log files to keep")
_ = viper.BindPFlag("log.max-rotations", cmd.PersistentFlags().Lookup("log-max-rotations"))
_ = cmd.PersistentFlags().MarkHidden("log-max-rotations")
return cmd
}