libs/log: remove Must constructor (#8120)

* libs/log: remove Must constructor

* Update test/e2e/node/main.go

Co-authored-by: M. J. Fromberger <michael.j.fromberger@gmail.com>

* use stdlog

Co-authored-by: M. J. Fromberger <michael.j.fromberger@gmail.com>

test/e2e/app/app.go

@@ -90,8 +90,13 @@ func NewApplication(cfg *Config) (*Application, error) {
 	if err != nil {
 		return nil, err
 	}
+	logger, err := log.NewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
+	if err != nil {
+		return nil, err
+	}
+
 	return &Application{
-		logger:    log.MustNewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo),
+		logger:    logger,
 		state:     state,
 		snapshots: snapshots,
 		cfg:       cfg,

test/e2e/generator/main.go

@@ -2,7 +2,9 @@
 package main
 
 import (
+	"context"
 	"fmt"
+	stdlog "log"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -17,21 +19,35 @@ const (
 	randomSeed int64 = 4827085738
 )
 
-var logger = log.MustNewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
-
 func main() {
-	NewCLI().Run()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	cli, err := NewCLI()
+	if err != nil {
+		stdlog.Fatal(err)
+	}
+
+	cli.Run(ctx)
 }
 
 // CLI is the Cobra-based command-line interface.
 type CLI struct {
-	root *cobra.Command
-	opts Options
+	root   *cobra.Command
+	opts   Options
+	logger log.Logger
 }
 
 // NewCLI sets up the CLI.
-func NewCLI() *CLI {
-	cli := &CLI{}
+func NewCLI() (*CLI, error) {
+	logger, err := log.NewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	cli := &CLI{
+		logger: logger,
+	}
 	cli.root = &cobra.Command{
 		Use:           "generator",
 		Short:         "End-to-end testnet generator",
@@ -51,7 +67,7 @@ func NewCLI() *CLI {
 	cli.root.PersistentFlags().IntVarP(&cli.opts.MaxNetworkSize, "max-size", "", 0,
 		"Maxmum network size (nodes), 0 is unlimited")
 
-	return cli
+	return cli, nil
 }
 
 // generate generates manifests in a directory.
@@ -90,9 +106,9 @@ func (cli *CLI) generate() error {
 }
 
 // Run runs the CLI.
-func (cli *CLI) Run() {
-	if err := cli.root.Execute(); err != nil {
-		logger.Error(err.Error())
+func (cli *CLI) Run(ctx context.Context) {
+	if err := cli.root.ExecuteContext(ctx); err != nil {
+		cli.logger.Error(err.Error())
 		os.Exit(1)
 	}
 }

test/e2e/node/main.go

@@ -34,8 +34,6 @@ import (
 	e2e "github.com/tendermint/tendermint/test/e2e/pkg"
 )
 
-var logger = log.MustNewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
-
 // main is the binary entrypoint.
 func main() {
 	ctx, cancel := context.WithCancel(context.Background())
@@ -51,7 +49,6 @@ func main() {
 	}
 
 	if err := run(ctx, configFile); err != nil {
-		logger.Error(err.Error())
 		os.Exit(1)
 	}
 }
@@ -63,9 +60,20 @@ func run(ctx context.Context, configFile string) error {
 		return err
 	}
 
+	logger, err := log.NewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
+	if err != nil {
+		// have print here because we can't log (yet), use the logger
+		// everywhere else.
+		fmt.Fprintln(os.Stderr, "ERROR:", err)
+		return err
+	}
+
 	// Start remote signer (must start before node if running builtin).
 	if cfg.PrivValServer != "" {
-		if err = startSigner(ctx, cfg); err != nil {
+		if err = startSigner(ctx, logger, cfg); err != nil {
+			logger.Error("starting signer",
+				"server", cfg.PrivValServer,
+				"err", err)
 			return err
 		}
 		if cfg.Protocol == "builtin" {
@@ -76,11 +84,11 @@ func run(ctx context.Context, configFile string) error {
 	// Start app server.
 	switch cfg.Protocol {
 	case "socket", "grpc":
-		err = startApp(ctx, cfg)
+		err = startApp(ctx, logger, cfg)
 	case "builtin":
 		switch cfg.Mode {
 		case string(e2e.ModeLight):
-			err = startLightNode(ctx, cfg)
+			err = startLightNode(ctx, logger, cfg)
 		case string(e2e.ModeSeed):
 			err = startSeedNode(ctx)
 		default:
@@ -90,6 +98,10 @@ func run(ctx context.Context, configFile string) error {
 		err = fmt.Errorf("invalid protocol %q", cfg.Protocol)
 	}
 	if err != nil {
+		logger.Error("starting node",
+			"protocol", cfg.Protocol,
+			"mode", cfg.Mode,
+			"err", err)
 		return err
 	}
 
@@ -100,7 +112,7 @@ func run(ctx context.Context, configFile string) error {
 }
 
 // startApp starts the application server, listening for connections from Tendermint.
-func startApp(ctx context.Context, cfg *Config) error {
+func startApp(ctx context.Context, logger log.Logger, cfg *Config) error {
 	app, err := app.NewApplication(cfg.App())
 	if err != nil {
 		return err
@@ -160,7 +172,7 @@ func startSeedNode(ctx context.Context) error {
 	return n.Start(ctx)
 }
 
-func startLightNode(ctx context.Context, cfg *Config) error {
+func startLightNode(ctx context.Context, logger log.Logger, cfg *Config) error {
 	tmcfg, nodeLogger, err := setupNode()
 	if err != nil {
 		return err
@@ -218,7 +230,7 @@ func startLightNode(ctx context.Context, cfg *Config) error {
 }
 
 // startSigner starts a signer server connecting to the given endpoint.
-func startSigner(ctx context.Context, cfg *Config) error {
+func startSigner(ctx context.Context, logger log.Logger, cfg *Config) error {
 	filePV, err := privval.LoadFilePV(cfg.PrivValKey, cfg.PrivValState)
 	if err != nil {
 		return err