internal/pkg/commands/command.go - voltctl - Gitiles

 /*
  * Copyright 2019-present Ciena Corporation
  *
  * 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 commands

 import (
 	"context"
 	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
 	"reflect"
 	"regexp"
 	"strconv"
 	"strings"
 	"time"

 	"github.com/golang/protobuf/jsonpb"
 	"github.com/golang/protobuf/proto"
 	configv1 "github.com/opencord/voltctl/internal/pkg/apis/config/v1"
 	configv2 "github.com/opencord/voltctl/internal/pkg/apis/config/v2"
 	configv3 "github.com/opencord/voltctl/internal/pkg/apis/config/v3"
 	"github.com/opencord/voltctl/pkg/filter"
 	"github.com/opencord/voltctl/pkg/format"
 	"github.com/opencord/voltctl/pkg/order"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	yaml "gopkg.in/yaml.v2"
 )

 type OutputType uint8

 const (
 	OUTPUT_TABLE OutputType = iota
 	OUTPUT_JSON
 	OUTPUT_YAML

 	supportedKvStoreType = "etcd"
 )

 var (
 	ParamNames = map[string]map[string]string{
 		"v1": {
 			"ID": "voltha.ID",
 		},
 		"v2": {
 			"ID": "common.ID",
 		},
 		"v3": {
 			"ID":             "common.ID",
 			"port":           "voltha.Port",
 			"ValueSpecifier": "common.ValueSpecifier",
 		},
 	}

 	CharReplacer = strings.NewReplacer("\\t", "\t", "\\n", "\n")

 	GlobalConfig = configv3.NewDefaultConfig()

 	GlobalCommandOptions = make(map[string]map[string]string)

 	GlobalOptions struct {
 		Config  string `short:"c" long:"config" env:"VOLTCONFIG" value-name:"FILE" default:"" description:"Location of client config file"`
 		Stack   string `short:"v" long:"stack" env:"STACK" value-name:"STACK" default:"" description:"Name of stack to use in multistack deployment"`
 		Server  string `short:"s" long:"server" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of VOLTHA"`
 		Kafka   string `short:"k" long:"kafka" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of Kafka"`
 		KvStore string `short:"e" long:"kvstore" env:"KVSTORE" value-name:"SERVER:PORT" description:"IP/Host and port of KV store (etcd)"`

 		// nolint: staticcheck
 		Debug              bool   `short:"d" long:"debug" description:"Enable debug mode"`
 		Timeout            string `short:"t" long:"timeout" description:"API call timeout duration" value-name:"DURATION" default:""`
 		UseTLS             bool   `long:"tls" description:"Use TLS"`
 		CACert             string `long:"tlscacert" value-name:"CA_CERT_FILE" description:"Trust certs signed only by this CA"`
 		Cert               string `long:"tlscert" value-name:"CERT_FILE" description:"Path to TLS vertificate file"`
 		Key                string `long:"tlskey" value-name:"KEY_FILE" description:"Path to TLS key file"`
 		Verify             bool   `long:"tlsverify" description:"Use TLS and verify the remote"`
 		K8sConfig          string `short:"8" long:"k8sconfig" env:"KUBECONFIG" value-name:"FILE" default:"" description:"Location of Kubernetes config file"`
 		KvStoreTimeout     string `long:"kvstoretimeout" env:"KVSTORE_TIMEOUT" value-name:"DURATION" default:"" description:"timeout for calls to KV store"`
 		CommandOptions     string `short:"o" long:"command-options" env:"VOLTCTL_COMMAND_OPTIONS" value-name:"FILE" default:"" description:"Location of command options default configuration file"`
 		MaxCallRecvMsgSize string `short:"m" long:"maxcallrecvmsgsize" description:"Max GRPC Client request size limit in bytes (eg: 4MB)" value-name:"SIZE" default:"4M"`
 	}

 	Debug = log.New(os.Stdout, "DEBUG: ", 0)
 	Info  = log.New(os.Stdout, "INFO: ", 0)
 	Warn  = log.New(os.Stderr, "WARN: ", 0)
 	Error = log.New(os.Stderr, "ERROR: ", 0)
 )

 type OutputOptions struct {
 	Format string `long:"format" value-name:"FORMAT" default:"" description:"Format to use to output structured data"`
 	Quiet  bool   `short:"q" long:"quiet" description:"Output only the IDs of the objects"`
 	// nolint: staticcheck
 	OutputAs  string `short:"o" long:"outputas" default:"table" choice:"table" choice:"json" choice:"yaml" description:"Type of output to generate"`
 	NameLimit int    `short:"l" long:"namelimit" default:"-1" value-name:"LIMIT" description:"Limit the depth (length) in the table column name"`
 }

 type FlowIdOptions struct {
 	HexId bool `short:"x" long:"hex-id" description:"Output Ids in hex format"`
 }

 type ListOutputOptions struct {
 	OutputOptions
 	Filter  string `short:"f" long:"filter" default:"" value-name:"FILTER" description:"Only display results that match filter"`
 	OrderBy string `short:"r" long:"orderby" default:"" value-name:"ORDER" description:"Specify the sort order of the results"`
 }

 type OutputOptionsJson struct {
 	Format string `long:"format" value-name:"FORMAT" default:"" description:"Format to use to output structured data"`
 	Quiet  bool   `short:"q" long:"quiet" description:"Output only the IDs of the objects"`
 	// nolint: staticcheck
 	OutputAs  string `short:"o" long:"outputas" default:"json" choice:"table" choice:"json" choice:"yaml" description:"Type of output to generate"`
 	NameLimit int    `short:"l" long:"namelimit" default:"-1" value-name:"LIMIT" description:"Limit the depth (length) in the table column name"`
 }

 type ListOutputOptionsJson struct {
 	OutputOptionsJson
 	Filter  string `short:"f" long:"filter" default:"" value-name:"FILTER" description:"Only display results that match filter"`
 	OrderBy string `short:"r" long:"orderby" default:"" value-name:"ORDER" description:"Specify the sort order of the results"`
 }

 func toOutputType(in string) OutputType {
 	switch in {
 	case "table":
 		fallthrough
 	default:
 		return OUTPUT_TABLE
 	case "json":
 		return OUTPUT_JSON
 	case "yaml":
 		return OUTPUT_YAML
 	}
 }

 type CommandResult struct {
 	Format    format.Format
 	Filter    string
 	OrderBy   string
 	OutputAs  OutputType
 	NameLimit int
 	Data      interface{}
 }

 func GetCommandOptionWithDefault(name, option, defaultValue string) string {
 	if cmd, ok := GlobalCommandOptions[name]; ok {
 		if val, ok := cmd[option]; ok {
 			return CharReplacer.Replace(val)
 		}
 	}
 	return defaultValue
 }

 var sizeParser = regexp.MustCompile(`^([0-9]+)([PETGMK]?)I?B?$`)

 func parseSize(size string) (uint64, error) {

 	parts := sizeParser.FindAllStringSubmatch(strings.ToUpper(size), -1)
 	if len(parts) == 0 {
 		return 0, fmt.Errorf("size: invalid size '%s'", size)
 	}
 	value, err := strconv.ParseUint(parts[0][1], 10, 64)
 	if err != nil {
 		return 0, fmt.Errorf("size: invalid size '%s'", size)
 	}
 	switch parts[0][2] {
 	case "E":
 		value = value * 1024 * 1024 * 1024 * 1024 * 1024 * 1024
 	case "P":
 		value = value * 1024 * 1024 * 1024 * 1024 * 1024
 	case "T":
 		value = value * 1024 * 1024 * 1024 * 1024
 	case "G":
 		value = value * 1024 * 1024 * 1024
 	case "M":
 		value = value * 1024 * 1024
 	case "K":
 		value = value * 1024
 	default:
 	}
 	return value, nil
 }

 func ProcessGlobalOptions() {
 	ReadConfig()

 	// If a stack is selected via command line set it
 	if GlobalOptions.Stack != "" {
 		if GlobalConfig.StackByName(GlobalOptions.Stack) == nil {
 			Error.Fatalf("stack specified, '%s', not found in configuration",
 				GlobalOptions.Stack)
 		}
 		GlobalConfig.CurrentStack = GlobalOptions.Stack
 	}

 	ApplyOptionOverrides(GlobalConfig.Current())

 	// If a k8s cert/key were not specified, then attempt to read it from
 	// any $HOME/.kube/config if it exists
 	if len(GlobalOptions.K8sConfig) == 0 {
 		home, err := os.UserHomeDir()
 		if err != nil {
 			Warn.Printf("Unable to discover the user's home directory: %s", err)
 			home = "~"
 		}
 		GlobalOptions.K8sConfig = filepath.Join(home, ".kube", "config")
 	}

 	if len(GlobalOptions.CommandOptions) == 0 {
 		home, err := os.UserHomeDir()
 		if err != nil {
 			Warn.Printf("Unable to discover the user's home directory: %s", err)
 			home = "~"
 		}
 		GlobalOptions.CommandOptions = filepath.Join(home, ".volt", "command_options")
 	}

 	if info, err := os.Stat(GlobalOptions.CommandOptions); err == nil && !info.IsDir() {
 		optionsFile, err := ioutil.ReadFile(GlobalOptions.CommandOptions)
 		if err != nil {
 			Error.Fatalf("Unable to read command options configuration file '%s' : %s",
 				GlobalOptions.CommandOptions, err.Error())
 		}
 		if err = yaml.Unmarshal(optionsFile, &GlobalCommandOptions); err != nil {
 			Error.Fatalf("Unable to parse the command line options configuration file '%s': %s",
 				GlobalOptions.CommandOptions, err.Error())
 		}
 	}
 }

 func ApplyOptionOverrides(stack *configv3.StackConfigSpec) {

 	if stack == nil {
 		// nothing to do
 		return
 	}
 	// Override from command line
 	if GlobalOptions.Server != "" {
 		stack.Server = GlobalOptions.Server
 	}

 	if GlobalOptions.UseTLS {
 		stack.Tls.UseTls = true
 	}

 	if GlobalOptions.Verify {
 		stack.Tls.Verify = true
 	}

 	if GlobalOptions.Kafka != "" {
 		stack.Kafka = GlobalOptions.Kafka
 	}

 	if GlobalOptions.KvStore != "" {
 		stack.KvStore = GlobalOptions.KvStore
 	}

 	if GlobalOptions.KvStoreTimeout != "" {
 		timeout, err := time.ParseDuration(GlobalOptions.KvStoreTimeout)
 		if err != nil {
 			Error.Fatalf("Unable to parse specified KV strore timeout duration '%s': %s",
 				GlobalOptions.KvStoreTimeout, err.Error())
 		}
 		stack.KvStoreConfig.Timeout = timeout
 	}

 	if GlobalOptions.Timeout != "" {
 		timeout, err := time.ParseDuration(GlobalOptions.Timeout)
 		if err != nil {
 			Error.Fatalf("Unable to parse specified timeout duration '%s': %s",
 				GlobalOptions.Timeout, err.Error())
 		}
 		stack.Grpc.Timeout = timeout
 	}

 	if GlobalOptions.MaxCallRecvMsgSize != "" {
 		stack.Grpc.MaxCallRecvMsgSize = GlobalOptions.MaxCallRecvMsgSize
 	}
 }

 func ReadConfig() {
 	if len(GlobalOptions.Config) == 0 {
 		home, err := os.UserHomeDir()
 		if err != nil {
 			Warn.Printf("Unable to discover the user's home directory: %s", err)
 			home = "~"
 		}
 		GlobalOptions.Config = filepath.Join(home, ".volt", "config")
 	}

 	if info, err := os.Stat(GlobalOptions.Config); err == nil && !info.IsDir() {
 		configFile, err := ioutil.ReadFile(GlobalOptions.Config)
 		if err != nil {
 			Error.Fatalf("Unable to read the configuration file '%s': %s",
 				GlobalOptions.Config, err.Error())
 		}
 		// First try the latest version of the config api then work
 		// backwards
 		if err = yaml.Unmarshal(configFile, &GlobalConfig); err != nil {
 			GlobalConfigV2 := configv2.NewDefaultConfig()
 			if err = yaml.Unmarshal(configFile, &GlobalConfigV2); err != nil {
 				GlobalConfigV1 := configv1.NewDefaultConfig()
 				if err = yaml.Unmarshal(configFile, &GlobalConfigV1); err != nil {
 					Error.Fatalf("Unable to parse the configuration file '%s': %s",
 						GlobalOptions.Config, err.Error())
 				}
 				GlobalConfig = configv3.FromConfigV1(GlobalConfigV1)
 			} else {
 				GlobalConfig = configv3.FromConfigV2(GlobalConfigV2)
 			}
 		}
 	}

 }

 func NewConnection() (*grpc.ClientConn, error) {
 	ProcessGlobalOptions()

 	// convert grpc.msgSize into bytes
 	n, err := parseSize(GlobalConfig.Current().Grpc.MaxCallRecvMsgSize)
 	if err != nil {
 		Error.Fatalf("Cannot convert msgSize %s to bytes", GlobalConfig.Current().Grpc.MaxCallRecvMsgSize)
 	}

 	var opts []grpc.DialOption

 	opts = append(opts,
 		grpc.WithDisableRetry(),
 		grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(int(n))))

 	if GlobalConfig.Current().Tls.UseTls {
 		creds := credentials.NewTLS(&tls.Config{
 			InsecureSkipVerify: !GlobalConfig.Current().Tls.Verify})
 		opts = append(opts, grpc.WithTransportCredentials(creds))
 	} else {
 		opts = append(opts, grpc.WithInsecure())
 	}
 	ctx, cancel := context.WithTimeout(context.TODO(),
 		GlobalConfig.Current().Grpc.ConnectTimeout)
 	defer cancel()
 	return grpc.DialContext(ctx, GlobalConfig.Current().Server, opts...)
 }

 func ConvertJsonProtobufArray(data_in interface{}) (string, error) {
 	result := ""

 	slice := reflect.ValueOf(data_in)
 	if slice.Kind() != reflect.Slice {
 		return "", errors.New("Not a slice")
 	}

 	result = result + "["

 	marshaler := jsonpb.Marshaler{EmitDefaults: true}
 	for i := 0; i < slice.Len(); i++ {
 		item := slice.Index(i).Interface()
 		protoMessage, okay := item.(proto.Message)
 		if !okay {
 			return "", errors.New("Failed to convert item to a proto.Message")
 		}
 		asJson, err := marshaler.MarshalToString(protoMessage)
 		if err != nil {
 			return "", fmt.Errorf("Failed to marshal the json: %s", err)
 		}

 		result = result + asJson

 		if i < slice.Len()-1 {
 			result = result + ","
 		}
 	}

 	result = result + "]"

 	return result, nil
 }

 func GenerateOutput(result *CommandResult) {
 	if result != nil && result.Data != nil {
 		data := result.Data
 		if result.Filter != "" {
 			f, err := filter.Parse(result.Filter)
 			if err != nil {
 				Error.Fatalf("Unable to parse specified output filter '%s': %s", result.Filter, err.Error())
 			}
 			data, err = f.Process(data)
 			if err != nil {
 				Error.Fatalf("Unexpected error while filtering command results: %s", err.Error())
 			}
 		}
 		if result.OrderBy != "" {
 			s, err := order.Parse(result.OrderBy)
 			if err != nil {
 				Error.Fatalf("Unable to parse specified sort specification '%s': %s", result.OrderBy, err.Error())
 			}
 			data, err = s.Process(data)
 			if err != nil {
 				Error.Fatalf("Unexpected error while sorting command result: %s", err.Error())
 			}
 		}
 		if result.OutputAs == OUTPUT_TABLE {
 			tableFormat := format.Format(result.Format)
 			if err := tableFormat.Execute(os.Stdout, true, result.NameLimit, data); err != nil {
 				Error.Fatalf("Unexpected error while attempting to format results as table : %s", err.Error())
 			}
 		} else if result.OutputAs == OUTPUT_JSON {
 			// first try to convert it as an array of protobufs
 			asJson, err := ConvertJsonProtobufArray(data)
 			if err != nil {
 				// if that fails, then just do a standard json conversion
 				asJsonB, err := json.Marshal(&data)
 				if err != nil {
 					Error.Fatalf("Unexpected error while processing command results to JSON: %s", err.Error())
 				}
 				asJson = string(asJsonB)
 			}
 			fmt.Printf("%s", asJson)
 		} else if result.OutputAs == OUTPUT_YAML {
 			asYaml, err := yaml.Marshal(&data)
 			if err != nil {
 				Error.Fatalf("Unexpected error while processing command results to YAML: %s", err.Error())
 			}
 			fmt.Printf("%s", asYaml)
 		}
 	}
 }
	/*
	* Copyright 2019-present Ciena Corporation
	*
	* 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 commands

	import (
	"context"
	"crypto/tls"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"reflect"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/golang/protobuf/jsonpb"
	"github.com/golang/protobuf/proto"
	configv1 "github.com/opencord/voltctl/internal/pkg/apis/config/v1"
	configv2 "github.com/opencord/voltctl/internal/pkg/apis/config/v2"
	configv3 "github.com/opencord/voltctl/internal/pkg/apis/config/v3"
	"github.com/opencord/voltctl/pkg/filter"
	"github.com/opencord/voltctl/pkg/format"
	"github.com/opencord/voltctl/pkg/order"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	yaml "gopkg.in/yaml.v2"
	)

	type OutputType uint8

	const (
	OUTPUT_TABLE OutputType = iota
	OUTPUT_JSON
	OUTPUT_YAML

	supportedKvStoreType = "etcd"
	)

	var (
	ParamNames = map[string]map[string]string{
	"v1": {
	"ID": "voltha.ID",
	},
	"v2": {
	"ID": "common.ID",
	},
	"v3": {
	"ID": "common.ID",
	"port": "voltha.Port",
	"ValueSpecifier": "common.ValueSpecifier",
	},
	}

	CharReplacer = strings.NewReplacer("\\t", "\t", "\\n", "\n")

	GlobalConfig = configv3.NewDefaultConfig()

	GlobalCommandOptions = make(map[string]map[string]string)

	GlobalOptions struct {
	Config string `short:"c" long:"config" env:"VOLTCONFIG" value-name:"FILE" default:"" description:"Location of client config file"`
	Stack string `short:"v" long:"stack" env:"STACK" value-name:"STACK" default:"" description:"Name of stack to use in multistack deployment"`
	Server string `short:"s" long:"server" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of VOLTHA"`
	Kafka string `short:"k" long:"kafka" default:"" value-name:"SERVER:PORT" description:"IP/Host and port of Kafka"`
	KvStore string `short:"e" long:"kvstore" env:"KVSTORE" value-name:"SERVER:PORT" description:"IP/Host and port of KV store (etcd)"`

	// nolint: staticcheck
	Debug bool `short:"d" long:"debug" description:"Enable debug mode"`
	Timeout string `short:"t" long:"timeout" description:"API call timeout duration" value-name:"DURATION" default:""`
	UseTLS bool `long:"tls" description:"Use TLS"`
	CACert string `long:"tlscacert" value-name:"CA_CERT_FILE" description:"Trust certs signed only by this CA"`
	Cert string `long:"tlscert" value-name:"CERT_FILE" description:"Path to TLS vertificate file"`
	Key string `long:"tlskey" value-name:"KEY_FILE" description:"Path to TLS key file"`
	Verify bool `long:"tlsverify" description:"Use TLS and verify the remote"`
	K8sConfig string `short:"8" long:"k8sconfig" env:"KUBECONFIG" value-name:"FILE" default:"" description:"Location of Kubernetes config file"`
	KvStoreTimeout string `long:"kvstoretimeout" env:"KVSTORE_TIMEOUT" value-name:"DURATION" default:"" description:"timeout for calls to KV store"`
	CommandOptions string `short:"o" long:"command-options" env:"VOLTCTL_COMMAND_OPTIONS" value-name:"FILE" default:"" description:"Location of command options default configuration file"`
	MaxCallRecvMsgSize string `short:"m" long:"maxcallrecvmsgsize" description:"Max GRPC Client request size limit in bytes (eg: 4MB)" value-name:"SIZE" default:"4M"`
	}

	Debug = log.New(os.Stdout, "DEBUG: ", 0)
	Info = log.New(os.Stdout, "INFO: ", 0)
	Warn = log.New(os.Stderr, "WARN: ", 0)
	Error = log.New(os.Stderr, "ERROR: ", 0)
	)

	type OutputOptions struct {
	Format string `long:"format" value-name:"FORMAT" default:"" description:"Format to use to output structured data"`
	Quiet bool `short:"q" long:"quiet" description:"Output only the IDs of the objects"`
	// nolint: staticcheck
	OutputAs string `short:"o" long:"outputas" default:"table" choice:"table" choice:"json" choice:"yaml" description:"Type of output to generate"`
	NameLimit int `short:"l" long:"namelimit" default:"-1" value-name:"LIMIT" description:"Limit the depth (length) in the table column name"`
	}

	type FlowIdOptions struct {
	HexId bool `short:"x" long:"hex-id" description:"Output Ids in hex format"`
	}

	type ListOutputOptions struct {
	OutputOptions
	Filter string `short:"f" long:"filter" default:"" value-name:"FILTER" description:"Only display results that match filter"`
	OrderBy string `short:"r" long:"orderby" default:"" value-name:"ORDER" description:"Specify the sort order of the results"`
	}

	type OutputOptionsJson struct {
	Format string `long:"format" value-name:"FORMAT" default:"" description:"Format to use to output structured data"`
	Quiet bool `short:"q" long:"quiet" description:"Output only the IDs of the objects"`
	// nolint: staticcheck
	OutputAs string `short:"o" long:"outputas" default:"json" choice:"table" choice:"json" choice:"yaml" description:"Type of output to generate"`
	NameLimit int `short:"l" long:"namelimit" default:"-1" value-name:"LIMIT" description:"Limit the depth (length) in the table column name"`
	}

	type ListOutputOptionsJson struct {
	OutputOptionsJson
	Filter string `short:"f" long:"filter" default:"" value-name:"FILTER" description:"Only display results that match filter"`
	OrderBy string `short:"r" long:"orderby" default:"" value-name:"ORDER" description:"Specify the sort order of the results"`
	}

	func toOutputType(in string) OutputType {
	switch in {
	case "table":
	fallthrough
	default:
	return OUTPUT_TABLE
	case "json":
	return OUTPUT_JSON
	case "yaml":
	return OUTPUT_YAML
	}
	}

	type CommandResult struct {
	Format format.Format
	Filter string
	OrderBy string
	OutputAs OutputType
	NameLimit int
	Data interface{}
	}

	func GetCommandOptionWithDefault(name, option, defaultValue string) string {
	if cmd, ok := GlobalCommandOptions[name]; ok {
	if val, ok := cmd[option]; ok {
	return CharReplacer.Replace(val)
	}
	}
	return defaultValue
	}

	var sizeParser = regexp.MustCompile(`^([0-9]+)([PETGMK]?)I?B?$`)

	func parseSize(size string) (uint64, error) {

	parts := sizeParser.FindAllStringSubmatch(strings.ToUpper(size), -1)
	if len(parts) == 0 {
	return 0, fmt.Errorf("size: invalid size '%s'", size)
	}
	value, err := strconv.ParseUint(parts[0][1], 10, 64)
	if err != nil {
	return 0, fmt.Errorf("size: invalid size '%s'", size)
	}
	switch parts[0][2] {
	case "E":
	value = value * 1024 * 1024 * 1024 * 1024 * 1024 * 1024
	case "P":
	value = value * 1024 * 1024 * 1024 * 1024 * 1024
	case "T":
	value = value * 1024 * 1024 * 1024 * 1024
	case "G":
	value = value * 1024 * 1024 * 1024
	case "M":
	value = value * 1024 * 1024
	case "K":
	value = value * 1024
	default:
	}
	return value, nil
	}

	func ProcessGlobalOptions() {
	ReadConfig()

	// If a stack is selected via command line set it
	if GlobalOptions.Stack != "" {
	if GlobalConfig.StackByName(GlobalOptions.Stack) == nil {
	Error.Fatalf("stack specified, '%s', not found in configuration",
	GlobalOptions.Stack)
	}
	GlobalConfig.CurrentStack = GlobalOptions.Stack
	}

	ApplyOptionOverrides(GlobalConfig.Current())

	// If a k8s cert/key were not specified, then attempt to read it from
	// any $HOME/.kube/config if it exists
	if len(GlobalOptions.K8sConfig) == 0 {
	home, err := os.UserHomeDir()
	if err != nil {
	Warn.Printf("Unable to discover the user's home directory: %s", err)
	home = "~"
	}
	GlobalOptions.K8sConfig = filepath.Join(home, ".kube", "config")
	}

	if len(GlobalOptions.CommandOptions) == 0 {
	home, err := os.UserHomeDir()
	if err != nil {
	Warn.Printf("Unable to discover the user's home directory: %s", err)
	home = "~"
	}
	GlobalOptions.CommandOptions = filepath.Join(home, ".volt", "command_options")
	}

	if info, err := os.Stat(GlobalOptions.CommandOptions); err == nil && !info.IsDir() {
	optionsFile, err := ioutil.ReadFile(GlobalOptions.CommandOptions)
	if err != nil {
	Error.Fatalf("Unable to read command options configuration file '%s' : %s",
	GlobalOptions.CommandOptions, err.Error())
	}
	if err = yaml.Unmarshal(optionsFile, &GlobalCommandOptions); err != nil {
	Error.Fatalf("Unable to parse the command line options configuration file '%s': %s",
	GlobalOptions.CommandOptions, err.Error())
	}
	}
	}

	func ApplyOptionOverrides(stack *configv3.StackConfigSpec) {

	if stack == nil {
	// nothing to do
	return
	}
	// Override from command line
	if GlobalOptions.Server != "" {
	stack.Server = GlobalOptions.Server
	}

	if GlobalOptions.UseTLS {
	stack.Tls.UseTls = true
	}

	if GlobalOptions.Verify {
	stack.Tls.Verify = true
	}

	if GlobalOptions.Kafka != "" {
	stack.Kafka = GlobalOptions.Kafka
	}

	if GlobalOptions.KvStore != "" {
	stack.KvStore = GlobalOptions.KvStore
	}

	if GlobalOptions.KvStoreTimeout != "" {
	timeout, err := time.ParseDuration(GlobalOptions.KvStoreTimeout)
	if err != nil {
	Error.Fatalf("Unable to parse specified KV strore timeout duration '%s': %s",
	GlobalOptions.KvStoreTimeout, err.Error())
	}
	stack.KvStoreConfig.Timeout = timeout
	}

	if GlobalOptions.Timeout != "" {
	timeout, err := time.ParseDuration(GlobalOptions.Timeout)
	if err != nil {
	Error.Fatalf("Unable to parse specified timeout duration '%s': %s",
	GlobalOptions.Timeout, err.Error())
	}
	stack.Grpc.Timeout = timeout
	}

	if GlobalOptions.MaxCallRecvMsgSize != "" {
	stack.Grpc.MaxCallRecvMsgSize = GlobalOptions.MaxCallRecvMsgSize
	}
	}

	func ReadConfig() {
	if len(GlobalOptions.Config) == 0 {
	home, err := os.UserHomeDir()
	if err != nil {
	Warn.Printf("Unable to discover the user's home directory: %s", err)
	home = "~"
	}
	GlobalOptions.Config = filepath.Join(home, ".volt", "config")
	}

	if info, err := os.Stat(GlobalOptions.Config); err == nil && !info.IsDir() {
	configFile, err := ioutil.ReadFile(GlobalOptions.Config)
	if err != nil {
	Error.Fatalf("Unable to read the configuration file '%s': %s",
	GlobalOptions.Config, err.Error())
	}
	// First try the latest version of the config api then work
	// backwards
	if err = yaml.Unmarshal(configFile, &GlobalConfig); err != nil {
	GlobalConfigV2 := configv2.NewDefaultConfig()
	if err = yaml.Unmarshal(configFile, &GlobalConfigV2); err != nil {
	GlobalConfigV1 := configv1.NewDefaultConfig()
	if err = yaml.Unmarshal(configFile, &GlobalConfigV1); err != nil {
	Error.Fatalf("Unable to parse the configuration file '%s': %s",
	GlobalOptions.Config, err.Error())
	}
	GlobalConfig = configv3.FromConfigV1(GlobalConfigV1)
	} else {
	GlobalConfig = configv3.FromConfigV2(GlobalConfigV2)
	}
	}
	}

	}

	func NewConnection() (*grpc.ClientConn, error) {
	ProcessGlobalOptions()

	// convert grpc.msgSize into bytes
	n, err := parseSize(GlobalConfig.Current().Grpc.MaxCallRecvMsgSize)
	if err != nil {
	Error.Fatalf("Cannot convert msgSize %s to bytes", GlobalConfig.Current().Grpc.MaxCallRecvMsgSize)
	}

	var opts []grpc.DialOption

	opts = append(opts,
	grpc.WithDisableRetry(),
	grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(int(n))))

	if GlobalConfig.Current().Tls.UseTls {
	creds := credentials.NewTLS(&tls.Config{
	InsecureSkipVerify: !GlobalConfig.Current().Tls.Verify})
	opts = append(opts, grpc.WithTransportCredentials(creds))
	} else {
	opts = append(opts, grpc.WithInsecure())
	}
	ctx, cancel := context.WithTimeout(context.TODO(),
	GlobalConfig.Current().Grpc.ConnectTimeout)
	defer cancel()
	return grpc.DialContext(ctx, GlobalConfig.Current().Server, opts...)
	}

	func ConvertJsonProtobufArray(data_in interface{}) (string, error) {
	result := ""

	slice := reflect.ValueOf(data_in)
	if slice.Kind() != reflect.Slice {
	return "", errors.New("Not a slice")
	}

	result = result + "["

	marshaler := jsonpb.Marshaler{EmitDefaults: true}
	for i := 0; i < slice.Len(); i++ {
	item := slice.Index(i).Interface()
	protoMessage, okay := item.(proto.Message)
	if !okay {
	return "", errors.New("Failed to convert item to a proto.Message")
	}
	asJson, err := marshaler.MarshalToString(protoMessage)
	if err != nil {
	return "", fmt.Errorf("Failed to marshal the json: %s", err)
	}

	result = result + asJson

	if i < slice.Len()-1 {
	result = result + ","
	}
	}

	result = result + "]"

	return result, nil
	}

	func GenerateOutput(result *CommandResult) {
	if result != nil && result.Data != nil {
	data := result.Data
	if result.Filter != "" {
	f, err := filter.Parse(result.Filter)
	if err != nil {
	Error.Fatalf("Unable to parse specified output filter '%s': %s", result.Filter, err.Error())
	}
	data, err = f.Process(data)
	if err != nil {
	Error.Fatalf("Unexpected error while filtering command results: %s", err.Error())
	}
	}
	if result.OrderBy != "" {
	s, err := order.Parse(result.OrderBy)
	if err != nil {
	Error.Fatalf("Unable to parse specified sort specification '%s': %s", result.OrderBy, err.Error())
	}
	data, err = s.Process(data)
	if err != nil {
	Error.Fatalf("Unexpected error while sorting command result: %s", err.Error())
	}
	}
	if result.OutputAs == OUTPUT_TABLE {
	tableFormat := format.Format(result.Format)
	if err := tableFormat.Execute(os.Stdout, true, result.NameLimit, data); err != nil {
	Error.Fatalf("Unexpected error while attempting to format results as table : %s", err.Error())
	}
	} else if result.OutputAs == OUTPUT_JSON {
	// first try to convert it as an array of protobufs
	asJson, err := ConvertJsonProtobufArray(data)
	if err != nil {
	// if that fails, then just do a standard json conversion
	asJsonB, err := json.Marshal(&data)
	if err != nil {
	Error.Fatalf("Unexpected error while processing command results to JSON: %s", err.Error())
	}
	asJson = string(asJsonB)
	}
	fmt.Printf("%s", asJson)
	} else if result.OutputAs == OUTPUT_YAML {
	asYaml, err := yaml.Marshal(&data)
	if err != nil {
	Error.Fatalf("Unexpected error while processing command results to YAML: %s", err.Error())
	}
	fmt.Printf("%s", asYaml)
	}
	}
	}