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config.go
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config.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2020 Datadog, Inc.
package app
import (
"bytes"
"encoding/json"
"fmt"
"html"
"net/http"
"github.com/DataDog/datadog-agent/cmd/agent/app/settings"
"github.com/DataDog/datadog-agent/cmd/agent/common"
"github.com/DataDog/datadog-agent/pkg/api/util"
"github.com/DataDog/datadog-agent/pkg/config"
"github.com/fatih/color"
"github.com/spf13/cobra"
)
func init() {
AgentCmd.AddCommand(configCommand)
configCommand.AddCommand(listRuntimeCommand)
configCommand.AddCommand(setCommand)
configCommand.AddCommand(getCommand)
}
var (
configCommand = &cobra.Command{
Use: "config",
Short: "Print the runtime configuration of a running agent",
Long: ``,
RunE: showRuntimeConfiguration,
}
listRuntimeCommand = &cobra.Command{
Use: "list-runtime",
Short: "List settings that can be changed at runtime",
Long: ``,
RunE: listRuntimeConfigurableValue,
}
setCommand = &cobra.Command{
Use: "set [setting] [value]",
Short: "Set, for the current runtime, the value of a given configuration setting",
Long: ``,
RunE: setConfigValue,
}
getCommand = &cobra.Command{
Use: "get [setting]",
Short: "Get, for the current runtime, the value of a given configuration setting",
Long: ``,
RunE: getConfigValue,
}
agentConfigURLPath = "/agent/config"
listRuntimeURLPath = agentConfigURLPath + "/list-runtime"
)
func setupConfig() error {
if flagNoColor {
color.NoColor = true
}
err := common.SetupConfigWithoutSecrets(confFilePath, "")
if err != nil {
return fmt.Errorf("unable to set up global agent configuration: %v", err)
}
err = config.SetupLogger(loggerName, config.GetEnv("DD_LOG_LEVEL", "off"), "", "", false, true, false)
if err != nil {
fmt.Printf("Cannot setup logger, exiting: %v\n", err)
return err
}
return util.SetAuthToken()
}
func showRuntimeConfiguration(cmd *cobra.Command, args []string) error {
err := setupConfig()
if err != nil {
return err
}
runtimeConfig, err := requestConfig()
if err != nil {
return err
}
fmt.Println(runtimeConfig)
return nil
}
func requestConfig() (string, error) {
c := util.GetClient(false)
ipcAddress, err := config.GetIPCAddress()
if err != nil {
return "", err
}
apiConfigURL := fmt.Sprintf("https://%v:%v"+agentConfigURLPath, ipcAddress, config.Datadog.GetInt("cmd_port"))
r, err := util.DoGet(c, apiConfigURL)
if err != nil {
var errMap = make(map[string]string)
json.Unmarshal(r, &errMap) //nolint:errcheck
// If the error has been marshalled into a json object, check it and return it properly
if e, found := errMap["error"]; found {
return "", fmt.Errorf(e)
}
return "", fmt.Errorf("Could not reach agent: %v \nMake sure the agent is running before requesting the runtime configuration and contact support if you continue having issues", err)
}
return string(r), nil
}
func listRuntimeConfigurableValue(cmd *cobra.Command, args []string) error {
err := setupConfig()
if err != nil {
return err
}
c := util.GetClient(false)
settings, err := getRuntimeSettingsList(c)
if err != nil {
return err
}
fmt.Println("=== Settings that can be changed at runtime ===")
for setting, details := range settings {
if !details.Hidden {
fmt.Printf("%-30s %s\n", setting, details.Description)
}
}
return nil
}
func setConfigValue(cmd *cobra.Command, args []string) error {
if len(args) != 2 {
return fmt.Errorf("Exactly two parameters are required: the setting name and its value")
}
err := setupConfig()
if err != nil {
return err
}
c := util.GetClient(false)
settings, err := getRuntimeSettingsList(c)
if err != nil {
return err
}
ipcAddress, err := config.GetIPCAddress()
if err != nil {
return err
}
url := fmt.Sprintf("https://%v:%v"+agentConfigURLPath+"/%v", ipcAddress, config.Datadog.GetInt("cmd_port"), args[0])
body := fmt.Sprintf("value=%s", html.EscapeString(args[1]))
r, err := util.DoPost(c, url, "application/x-www-form-urlencoded", bytes.NewBuffer([]byte(body)))
if err != nil {
var errMap = make(map[string]string)
json.Unmarshal(r, &errMap) //nolint:errcheck
// If the error has been marshalled into a json object, check it and return it properly
if e, found := errMap["error"]; found {
return fmt.Errorf(e)
}
return err
}
if setting, ok := settings[args[0]]; ok && setting.Hidden {
fmt.Printf("IMPORTANT: you have modified a hidden option, this may incur in billing or other unexpected side-effects.\n")
}
fmt.Printf("Configuration setting %s is now set to: %s\n", args[0], args[1])
return nil
}
func getConfigValue(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
return fmt.Errorf("A single setting name must be specified")
}
err := setupConfig()
if err != nil {
return err
}
c := util.GetClient(false)
ipcAddress, err := config.GetIPCAddress()
if err != nil {
return err
}
url := fmt.Sprintf("https://%v:%v"+agentConfigURLPath+"/%v", ipcAddress, config.Datadog.GetInt("cmd_port"), args[0])
r, err := util.DoGet(c, url)
if err != nil {
var errMap = make(map[string]string)
json.Unmarshal(r, &errMap) //nolint:errcheck
// If the error has been marshalled into a json object, check it and return it properly
if e, found := errMap["error"]; found {
return fmt.Errorf(e)
}
return err
}
var setting = make(map[string]interface{})
err = json.Unmarshal(r, &setting)
if err != nil {
return err
}
if value, found := setting["value"]; found {
fmt.Printf("%s is set to: %v\n", args[0], value)
return nil
}
return fmt.Errorf("unable to get value for this setting: %v", args[0])
}
func getRuntimeSettingsList(c *http.Client) (map[string]settings.RuntimeSettingResponse, error) {
ipcAddress, err := config.GetIPCAddress()
if err != nil {
return nil, err
}
url := fmt.Sprintf("https://%v:%v"+listRuntimeURLPath, ipcAddress, config.Datadog.GetInt("cmd_port"))
r, err := util.DoGet(c, url)
if err != nil {
var errMap = make(map[string]string)
json.Unmarshal(r, &errMap) //nolint:errcheck
// If the error has been marshalled into a json object, check it and return it properly
if e, found := errMap["error"]; found {
return nil, fmt.Errorf(e)
}
return nil, err
}
var settings = make(map[string]settings.RuntimeSettingResponse)
err = json.Unmarshal(r, &settings)
if err != nil {
return nil, err
}
return settings, nil
}