cmd/cli: add internal logging

So in case of no logging enabled, useful data could be sent to ControlD
server for further troubleshooting.

cmd/cli/commands.go

@@ -0,0 +1,88 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+)
+
+func initLogCmd() {
+	logSendCmd := &cobra.Command{
+		Use:   "send",
+		Short: "Send runtime debug logs to ControlD",
+		Args:  cobra.NoArgs,
+		Run: func(cmd *cobra.Command, args []string) {
+			dir, err := socketDir()
+			if err != nil {
+				mainLog.Load().Fatal().Err(err).Msg("failed to find ctrld home dir")
+			}
+			cc := newControlClient(filepath.Join(dir, ctrldControlUnixSock))
+			resp, err := cc.post(sendLogsPath, nil)
+			if err != nil {
+				mainLog.Load().Fatal().Err(err).Msg("failed to send logs")
+			}
+			defer resp.Body.Close()
+			switch resp.StatusCode {
+			case http.StatusOK:
+				mainLog.Load().Notice().Msg("runtime logs sent successfully")
+			case http.StatusServiceUnavailable:
+				mainLog.Load().Warn().Msg("runtime logs could only be sent once per minute")
+			default:
+				buf, err := io.ReadAll(resp.Body)
+				if err != nil {
+					mainLog.Load().Fatal().Err(err).Msg("failed to read response body")
+				}
+				mainLog.Load().Error().Msg("failed to send logs")
+				mainLog.Load().Error().Msg(string(buf))
+			}
+		},
+	}
+	logViewCmd := &cobra.Command{
+		Use:   "view",
+		Short: "View current runtime debug logs",
+		Args:  cobra.NoArgs,
+		Run: func(cmd *cobra.Command, args []string) {
+			dir, err := socketDir()
+			if err != nil {
+				mainLog.Load().Fatal().Err(err).Msg("failed to find ctrld home dir")
+			}
+			cc := newControlClient(filepath.Join(dir, ctrldControlUnixSock))
+			resp, err := cc.post(viewLogsPath, nil)
+			if err != nil {
+				mainLog.Load().Fatal().Err(err).Msg("failed to get logs")
+			}
+			defer resp.Body.Close()
+
+			switch resp.StatusCode {
+			case http.StatusMovedPermanently:
+				mainLog.Load().Warn().Msg("runtime debugs log is not enabled")
+				mainLog.Load().Warn().Msg(`ctrld may be run without "--cd" flag or logging is already enabled`)
+				return
+			case http.StatusBadRequest:
+				mainLog.Load().Warn().Msg("runtime debugs log is not available")
+				return
+			case http.StatusOK:
+			}
+			var logs logViewResponse
+			if err := json.NewDecoder(resp.Body).Decode(&logs); err != nil {
+				mainLog.Load().Fatal().Err(err).Msg("failed to decode view logs result")
+			}
+			fmt.Println(logs.Data)
+		},
+	}
+	logCmd := &cobra.Command{
+		Use:   "log",
+		Short: "Manage runtime debug logs",
+		Args:  cobra.OnlyValidArgs,
+		ValidArgs: []string{
+			logSendCmd.Use,
+		},
+	}
+	logCmd.AddCommand(logSendCmd)
+	logCmd.AddCommand(logViewCmd)
+	rootCmd.AddCommand(logCmd)
+}