Allow interactive px cli usage to prompt and save preferred cloud in pixie config file (#1964)

Summary: Allow interactive px cli usage to prompt and save preferred
cloud in pixie config file

This is a continuation of the plan I outlined in #1960 now that cloud
addr is required for the `px` cli.

Relevant Issues: N/A

Type of change: /kind feature

Test Plan: Verified the following scenarios. I will make sure to update
the PX cli release checklist accordingly if/when approved
<details><summary>Default cloud selection testing</summary>

- [x] Running `px` command that requires cloud prompts for selection and
whether to store it
```
$ ./px auth login
Pixie CLI
✔ withpixie.ai:443
✔ No                         <------ Cloud selection was opted out of
Starting browser... (if browser-based login fails, try running `px auth login --manual` for headless login)
Fetching refresh token ...
Failed to perform browser based auth. Will try manual auth error=browser failed to open

Please Visit:
         https://work.withpixie.ai:443/login?local_mode=true

Copy and paste token here: ^C
```
- [x] Cli commands following storing preferred cloud use the preferred
value
```
$ ./px auth login
Pixie CLI
✔ withpixie.ai:443
✔ Yes                              <------ Cloud selection was opted into saving
Starting browser... (if browser-based login fails, try running `px auth login --manual` for headless login)
Fetching refresh token ...
Failed to perform browser based auth. Will try manual auth error=browser failed to open

Please Visit:
         https://work.withpixie.ai:443/login?local_mode=true

Copy and paste token here: ^C
$ ./px auth login
Pixie CLI
Starting browser... (if browser-based login fails, try running `px auth login --manual` for headless login)
Fetching refresh token ...
Failed to perform browser based auth. Will try manual auth error=browser failed to open

Please Visit:
         https://work.withpixie.ai:443/login?local_mode=true

Copy and paste token here: ^C

$ cat ~/.pixie/config.json
{"uniqueClientID":"XXX","cloudAddr":"withpixie.ai:443"}
```
- [x] Using `--cloud_addr` overrides the value set in config file

```
$ cat ~/.pixie/config.json
{"uniqueClientID":"XXX","cloudAddr":"boguscloud.com"}
$ ./px --cloud_addr=withpixie.ai auth login
Pixie CLI
Starting browser... (if browser-based login fails, try running `px auth login --manual` for headless login)
Fetching refresh token ...
Failed to perform browser based auth. Will try manual auth error=browser failed to open

Please Visit:
         https://work.withpixie.ai:443/login?local_mode=true

Copy and paste token here:
```

- [x] Running non-interactively uses cloud stored in config file
- [x] Running non-interactively without preferred cloud or
`--cloud_addr` results in error
</details>

<details><summary>`px config` command testing</summary>

- [x] `px config list` prints out cloud addr
```
$ ./px config list
Pixie CLI
CloudAddr: boguscloud.com
```

- [x] `px config set` validates arguments
```
$ ./px config set --key NonExistant --value tesitng
Pixie CLI
FATA[0000]src/pixie_cli/pkg/cmd/config.go:80 px.dev/pixie/src/pixie_cli/pkg/cmd.glob..func16() Key 'NonExistant' is not settable. Must be one of [CloudAddr]

$ ./px config set --key CloudAddr --value withpixie.ai:443 --value testing
Pixie CLI
FATA[0000]src/pixie_cli/pkg/cmd/config.go:74 px.dev/pixie/src/pixie_cli/pkg/cmd.glob..func16() the number of --key and --value flags must match
```

- [x] `px config set` updates config file
```
$ ./px config set --key CloudAddr --value withpixie.ai:443
Pixie CLI

$ ./px config list
Pixie CLI
CloudAddr: withpixie.ai:443
```

</details>

Changelog Message: Update `px` cli to store preferred cloud in pixie
config file

Signed-off-by: Dom Del Nano <ddelnano@gmail.com>

Author: ddelnano

go.mod

@@ -45,6 +45,7 @@ require (
 	github.com/mattn/go-isatty v0.0.17
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/mikefarah/yq/v4 v4.30.8
+	github.com/mitchellh/mapstructure v1.5.0
 	github.com/nats-io/nats-server/v2 v2.10.4
 	github.com/nats-io/nats.go v1.31.0
 	github.com/olekukonko/tablewriter v0.0.5
@@ -214,7 +215,6 @@ require (
 	github.com/mitchellh/copystructure v1.0.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.0 // indirect
 	github.com/moby/spdystream v0.2.0 // indirect
 	github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae // indirect

src/pixie_cli/pkg/cmd/BUILD.bazel

@@ -23,6 +23,7 @@ go_library(
         "auth.go",
         "bindata.gen.go",
         "collect_logs.go",
+        "config.go",
         "create_bundle.go",
         "create_cloud_certs.go",
         "debug.go",
@@ -73,6 +74,7 @@ go_library(
         "@com_github_lestrrat_go_jwx//jwt",
         "@com_github_manifoldco_promptui//:promptui",
         "@com_github_mattn_go_isatty//:go-isatty",
+        "@com_github_mitchellh_mapstructure//:mapstructure",
         "@com_github_segmentio_analytics_go_v3//:analytics-go",
         "@com_github_sirupsen_logrus//:logrus",
         "@com_github_spf13_cobra//:cobra",

src/pixie_cli/pkg/cmd/config.go

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2018- The Pixie Authors.
+ *
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/mitchellh/mapstructure"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"golang.org/x/exp/slices"
+
+	"px.dev/pixie/src/pixie_cli/pkg/pxconfig"
+)
+
+func init() {
+	ConfigCmd.AddCommand(ConfigListCmd)
+	ConfigCmd.AddCommand(ConfigSetCmd)
+
+	ConfigSetCmd.Flags().StringArray("key", []string{}, "Key to set")
+	ConfigSetCmd.Flags().StringArray("value", []string{}, "Value to set")
+}
+
+var settableConfigKeys = pxconfig.GetSettableConfigKeys()
+
+var ConfigSetCmd = &cobra.Command{
+	Use:   "set",
+	Short: "Set configuration options",
+	Run: func(cmd *cobra.Command, args []string) {
+		keys, _ := cmd.Flags().GetStringArray("key")
+		values, _ := cmd.Flags().GetStringArray("value")
+
+		input := map[string]interface{}{}
+		for i := 0; i < len(keys); i++ {
+			key := keys[i]
+			value := values[i]
+			input[key] = value
+		}
+
+		cfg := pxconfig.Cfg()
+		err := mapstructure.Decode(input, cfg)
+
+		if err != nil {
+			log.Fatalf("Failed to set config: %v", err)
+		}
+
+		err = pxconfig.UpdateConfig(cfg)
+		if err != nil {
+			log.Fatalf("Failed to update config: %v", err)
+		}
+	},
+	PreRun: func(cmd *cobra.Command, args []string) {
+		keys, _ := cmd.Flags().GetStringArray("key")
+		values, _ := cmd.Flags().GetStringArray("value")
+
+		if len(keys) != len(values) {
+			log.Fatal("the number of --key and --value flags must match")
+			os.Exit(1)
+		}
+
+		for _, key := range keys {
+			if !slices.Contains(settableConfigKeys, key) {
+				log.Fatalf("Key '%s' is not settable. Must be one of %v", key, settableConfigKeys)
+			}
+		}
+	},
+}
+
+// ConfigListCmd is the "config list" command.
+var ConfigListCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List configuration options",
+	Run: func(cmd *cobra.Command, args []string) {
+		cfg := pxconfig.Cfg().ConfigInfoSettable
+
+		var configuration map[string]interface{}
+		err := mapstructure.Decode(cfg, &configuration)
+		if err != nil {
+			log.Fatalf("Failed to decode config: %v", err)
+		}
+		for key, value := range configuration {
+			fmt.Printf("%s: %v\n", key, value)
+		}
+	},
+}
+
+// ConfigCmd is the "config" command.
+var ConfigCmd = &cobra.Command{
+	Use:   "config",
+	Short: "Get information about the pixie config file",
+}

src/pixie_cli/pkg/cmd/root.go

@@ -72,6 +72,7 @@ func init() {
 	viper.BindPFlag("direct_vizier_key", RootCmd.PersistentFlags().Lookup("direct_vizier_key"))
 
 	RootCmd.AddCommand(VersionCmd)
+	RootCmd.AddCommand(ConfigCmd)
 	RootCmd.AddCommand(AuthCmd)
 	RootCmd.AddCommand(CollectLogsCmd)
 	RootCmd.AddCommand(CreateCloudCertsCmd)
@@ -201,6 +202,8 @@ var RootCmd = &cobra.Command{
 // Name a variable to store a slice of commands that don't require cloudAddr
 var cmdsCloudAddrNotReqd = []*cobra.Command{
 	CollectLogsCmd,
+	ConfigListCmd,
+	ConfigSetCmd,
 	VersionCmd,
 }
 
@@ -212,6 +215,12 @@ func getCloudAddrIfRequired(cmd *cobra.Command) string {
 	}
 
 	cloudAddr := viper.GetString("cloud_addr")
+	cfg := pxconfig.Cfg()
+	defaultCloudAddr = cfg.CloudAddr
+	if cloudAddr == "" && defaultCloudAddr != "" {
+		cloudAddr = defaultCloudAddr
+		viper.Set("cloud_addr", cloudAddr)
+	}
 	if cloudAddr == "" {
 		if !isatty.IsTerminal(os.Stdin.Fd()) {
 			utils.Errorf("No cloud address provided during run within non-interactive shell. Please set the cloud address using the `--cloud_addr` flag or `PX_CLOUD_ADDR` environment variable.")
@@ -229,6 +238,26 @@ func getCloudAddrIfRequired(cmd *cobra.Command) string {
 
 			cloudAddr = selectedCloud
 			viper.Set("cloud_addr", cloudAddr)
+
+			defaultCloudPrompt := promptui.Select{
+				Label: "Set as default cloud address?",
+				Items: []string{"Yes", "No"},
+			}
+			_, storeDefault, err := defaultCloudPrompt.Run()
+			if err != nil {
+				utils.WithError(err).Fatal("Failed to select default cloud address")
+				os.Exit(1)
+			}
+
+			if storeDefault == "Yes" {
+				cfg.CloudAddr = cloudAddr
+				err := pxconfig.UpdateConfig(cfg)
+
+				if err != nil {
+					utils.WithError(err).Fatal("Failed to update config file with default cloud address")
+					os.Exit(1)
+				}
+			}
 		}
 	}
 	return cloudAddr

src/pixie_cli/pkg/pxconfig/config.go

@@ -21,6 +21,7 @@ package pxconfig
 import (
 	"encoding/json"
 	"os"
+	"reflect"
 	"sync"
 
 	"github.com/gofrs/uuid"
@@ -31,14 +32,41 @@ import (
 // ConfigInfo store the config about the CLI.
 type ConfigInfo struct {
 	// UniqueClientID is the ID assigned to this user on first startup when auth information is not know. This can be later associated with the UserID.
-	UniqueClientID string `json:"uniqueClientID"`
+	UniqueClientID     string `json:"uniqueClientID"`
+	ConfigInfoSettable `mapstructure:",squash"`
+}
+
+type ConfigInfoSettable struct {
+	CloudAddr string `json:"cloudAddr,omitempty"`
 }
 
 var (
 	config *ConfigInfo
 	once   sync.Once
 )
 
+func GetSettableConfigKeys() []string {
+	val := reflect.ValueOf(ConfigInfoSettable{})
+	keys := []string{}
+	for i := 0; i < val.NumField(); i++ {
+		keys = append(keys, val.Type().Field(i).Name)
+	}
+	return keys
+}
+
+func UpdateConfig(cfg *ConfigInfo) error {
+	configPath, err := utils.EnsureDefaultConfigFilePath()
+	if err != nil {
+		utils.WithError(err).Fatal("Failed to load/create config file path")
+	}
+	f, err := os.OpenFile(configPath, os.O_RDWR|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return json.NewEncoder(f).Encode(cfg)
+}
+
 func writeDefaultConfig(path string) (*ConfigInfo, error) {
 	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0600)
 	if err != nil {