chore: import upstream snapshot with attribution

cmd/micro/cli/util/util.go

@@ -0,0 +1,72 @@
+// Package cliutil contains methods used across all cli commands
+// @todo: get rid of os.Exits and use errors instread
+package util
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"github.com/urfave/cli/v2"
+	merrors "go-micro.dev/v6/errors"
+)
+
+type Exec func(*cli.Context, []string) ([]byte, error)
+
+func Print(e Exec) func(*cli.Context) error {
+	return func(c *cli.Context) error {
+		rsp, err := e(c, c.Args().Slice())
+		if err != nil {
+			return CliError(err)
+		}
+		if len(rsp) > 0 {
+			fmt.Printf("%s\n", string(rsp))
+		}
+		return nil
+	}
+}
+
+// CliError returns a user friendly message from error. If we can't determine a good one returns an error with code 128
+func CliError(err error) cli.ExitCoder {
+	if err == nil {
+		return nil
+	}
+	// if it's already a cli.ExitCoder we use this
+	cerr, ok := err.(cli.ExitCoder)
+	if ok {
+		return cerr
+	}
+
+	// grpc errors
+	if mname := regexp.MustCompile(`malformed method name: \\?"(\w+)\\?"`).FindStringSubmatch(err.Error()); len(mname) > 0 {
+		return cli.Exit(fmt.Sprintf(`Method name "%s" invalid format. Expecting service.endpoint`, mname[1]), 3)
+	}
+	if service := regexp.MustCompile(`service ([\w\.]+): route not found`).FindStringSubmatch(err.Error()); len(service) > 0 {
+		return cli.Exit(fmt.Sprintf(`Service "%s" not found`, service[1]), 4)
+	}
+	if service := regexp.MustCompile(`unknown service ([\w\.]+)`).FindStringSubmatch(err.Error()); len(service) > 0 {
+		if strings.Contains(service[0], ".") {
+			return cli.Exit(fmt.Sprintf(`Service method "%s" not found`, service[1]), 5)
+		}
+		return cli.Exit(fmt.Sprintf(`Service "%s" not found`, service[1]), 5)
+	}
+	if address := regexp.MustCompile(`Error while dialing dial tcp.*?([\w]+\.[\w:\.]+): `).FindStringSubmatch(err.Error()); len(address) > 0 {
+		return cli.Exit(fmt.Sprintf(`Failed to connect to micro server at %s`, address[1]), 4)
+	}
+
+	merr, ok := err.(*merrors.Error)
+	if !ok {
+		return cli.Exit(err, 128)
+	}
+
+	switch merr.Code {
+	case 408:
+		return cli.Exit("Request timed out", 1)
+	case 401:
+		// TODO check if not signed in, prompt to sign in
+		return cli.Exit("Not authorized to perform this request", 2)
+	}
+
+	// fallback to using the detail from the merr
+	return cli.Exit(merr.Detail, 127)
+}