cmd/clef: list accounts at startup (ethereum#26082)

Reports accounts known to Clef during startup, after master seed is provided by the user.

cmd/clef/main.go

@@ -707,6 +707,7 @@ func signer(c *cli.Context) error {
 	// it with the UI.
 	ui.RegisterUIServer(core.NewUIServerAPI(apiImpl))
 	api = apiImpl
+
 	// Audit logging
 	if logfile := c.String(auditLogFlag.Name); logfile != "" {
 		api, err = core.NewAuditLogger(logfile, api)
@@ -768,7 +769,6 @@ func signer(c *cli.Context) error {
 			log.Info("IPC endpoint closed", "url", ipcapiURL)
 		}()
 	}
-
 	if c.Bool(testFlag.Name) {
 		log.Info("Performing UI test")
 		go testExternalUI(apiImpl)
@@ -779,8 +779,7 @@ func signer(c *cli.Context) error {
 			"extapi_version": core.ExternalAPIVersion,
 			"extapi_http":    extapiURL,
 			"extapi_ipc":     ipcapiURL,
-		},
-	})
+		}})
 
 	abortChan := make(chan os.Signal, 1)
 	signal.Notify(abortChan, os.Interrupt)

signer/core/cliui.go

@@ -18,6 +18,7 @@ package core
 
 import (
 	"bufio"
+	"context"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -31,16 +32,17 @@ import (
 )
 
 type CommandlineUI struct {
-	in *bufio.Reader
-	mu sync.Mutex
+	in  *bufio.Reader
+	mu  sync.Mutex
+	api *UIServerAPI
 }
 
 func NewCommandlineUI() *CommandlineUI {
 	return &CommandlineUI{in: bufio.NewReader(os.Stdin)}
 }
 
 func (ui *CommandlineUI) RegisterUIServer(api *UIServerAPI) {
-	// noop
+	ui.api = api
 }
 
 // readString reads a single line from stdin, trimming if from spaces, enforcing
@@ -241,9 +243,28 @@ func (ui *CommandlineUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
 	}
 }
 
+func (ui *CommandlineUI) showAccounts() {
+	accounts, err := ui.api.ListAccounts(context.Background())
+	if err != nil {
+		log.Error("Error listing accounts", "err", err)
+		return
+	}
+	if len(accounts) == 0 {
+		fmt.Print("No accounts found\n")
+		return
+	}
+	var out = new(strings.Builder)
+	fmt.Fprint(out, "\n------- Available accounts -------\n")
+	for i, account := range accounts {
+		fmt.Fprintf(out, "%d. %s at %s\n", i, account.Address, account.URL)
+	}
+	fmt.Print(out.String())
+}
+
 func (ui *CommandlineUI) OnSignerStartup(info StartupInfo) {
-	fmt.Printf("------- Signer info -------\n")
+	fmt.Print("\n------- Signer info -------\n")
 	for k, v := range info.Info {
 		fmt.Printf("* %v : %v\n", k, v)
 	}
+	go ui.showAccounts()
 }