How to use Error method of logger Package

Best Gauge code snippet using logger.Error

server.go

Source:server.go Github

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...13 "github.com/friendsofgo/errors"14 "github.com/volatiletech/abcweb/v5/abcconfig"15 "go.uber.org/zap"16)17// ServerErrLogger allows us to use the zap.Logger as our http.Server ErrorLog18type ServerErrLogger struct {19 log *zap.Logger20}21// Implement Write to log server errors using the zap logger22func (s ServerErrLogger) Write(b []byte) (int, error) {23 s.log.Debug(string(b))24 return 0, nil25}26// StartServer starts the web server on the specified port, and can be27// gracefully shut down by sending an os.Interrupt signal to the server.28// This is a blocking call.29func StartServer(cfg abcconfig.ServerConfig, router http.Handler, logger *zap.Logger, kill chan struct{}) error {30 errs := make(chan error)31 // These start in goroutines and converge when we kill them32 primary := mainServer(cfg, router, logger, errs)33 var secondary *http.Server34 if len(cfg.TLSBind) != 0 && len(cfg.Bind) != 0 {35 secondary = redirectServer(cfg, logger, errs)36 }37 quit := make(chan os.Signal)38 signal.Notify(quit, os.Interrupt, os.Kill)39 select {40 case <-kill:41 logger.Info("internal shutdown initiated")42 case sig := <-quit:43 logger.Info("signal received, shutting down", zap.String("signal", sig.String()))44 case err := <-errs:45 logger.Error("error from server, shutting down", zap.Error(err))46 }47 if err := primary.Shutdown(context.Background()); err != nil {48 logger.Error("error shutting down http(s) server", zap.Error(err))49 }50 if secondary != nil {51 if err := secondary.Shutdown(context.Background()); err != nil {52 logger.Error("error shutting down redirector server", zap.Error(err))53 }54 }55 logger.Info("http(s) server shut down complete")56 return nil57}58func mainServer(cfg abcconfig.ServerConfig, router http.Handler, logger *zap.Logger, errs chan<- error) *http.Server {59 server := basicServer(cfg, logger)60 server.Handler = router61 useTLS := len(cfg.TLSBind) != 062 if !useTLS {63 server.Addr = cfg.Bind64 logger.Info("starting http listener", zap.String("bind", cfg.Bind))65 go func() {66 if err := server.ListenAndServe(); err != nil {67 errs <- errors.Wrap(err, "http listener died")68 }69 }()70 return server71 }72 server.Addr = cfg.TLSBind73 server.TLSConfig = &tls.Config{74 // Causes servers to use Go's default ciphersuite preferences,75 // which are tuned to avoid attacks. Does nothing on clients.76 PreferServerCipherSuites: true,77 // Only use curves which have assembly implementations78 CurvePreferences: []tls.CurveID{tls.CurveP256, tls.X25519},79 }80 logger.Info("starting https listener", zap.String("bind", cfg.TLSBind))81 go func() {82 if err := server.ListenAndServeTLS(cfg.TLSCertFile, cfg.TLSKeyFile); err != nil {83 errs <- errors.Wrap(err, "https listener died")84 }85 }()86 return server87}88func redirectServer(cfg abcconfig.ServerConfig, logger *zap.Logger, errs chan<- error) *http.Server {89 _, httpsPort, err := net.SplitHostPort(cfg.TLSBind)90 if err != nil {91 errs <- errors.Wrap(err, "http listener died")92 return nil93 }94 server := basicServer(cfg, logger)95 server.Addr = cfg.Bind96 server.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {97 var err error98 httpHost := r.Host99 // Remove port if it exists so we can replace it with https port100 if strings.ContainsRune(r.Host, ':') {101 httpHost, _, err = net.SplitHostPort(r.Host)102 if err != nil {103 logger.Error("failed to get http host from request", zap.String("host", r.Host), zap.Error(err))104 w.WriteHeader(http.StatusBadRequest)105 io.WriteString(w, "invalid host header")106 return107 }108 }109 var url string110 if httpsPort != "443" {111 url = fmt.Sprintf("https://%s:%s%s", httpHost, httpsPort, r.RequestURI)112 } else {113 url = fmt.Sprintf("https://%s%s", httpHost, r.RequestURI)114 }115 logger.Info("redirect", zap.String("remote", r.RemoteAddr), zap.String("host", r.Host), zap.String("path", r.URL.String()), zap.String("redirecturl", url))116 http.Redirect(w, r, url, http.StatusMovedPermanently)117 })118 logger.Info("starting http listener", zap.String("bind", cfg.Bind))119 go func() {120 if err := server.ListenAndServe(); err != nil {121 errs <- errors.Wrap(err, "http listener died")122 }123 }()124 return server125}126func basicServer(cfg abcconfig.ServerConfig, logger *zap.Logger) *http.Server {127 server := &http.Server{128 ReadTimeout: cfg.ReadTimeout,129 WriteTimeout: cfg.WriteTimeout,130 IdleTimeout: cfg.IdleTimeout,131 ErrorLog: log.New(ServerErrLogger{log: logger}, "", 0),132 }133 return server134}...

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tm_logger.go

Source:tm_logger.go Github

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...43// Info logs a message at level Info.44func (l *tmLogger) Info(msg string, keyvals ...interface{}) {45 lWithLevel := kitlevel.Info(l.srcLogger)46 if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {47 errLogger := kitlevel.Error(l.srcLogger)48 kitlog.With(errLogger, msgKey, msg).Log("err", err)49 }50}51// Debug logs a message at level Debug.52func (l *tmLogger) Debug(msg string, keyvals ...interface{}) {53 lWithLevel := kitlevel.Debug(l.srcLogger)54 if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {55 errLogger := kitlevel.Error(l.srcLogger)56 kitlog.With(errLogger, msgKey, msg).Log("err", err)57 }58}59// Error logs a message at level Error.60func (l *tmLogger) Error(msg string, keyvals ...interface{}) {61 lWithLevel := kitlevel.Error(l.srcLogger)62 lWithMsg := kitlog.With(lWithLevel, msgKey, msg)63 if err := lWithMsg.Log(keyvals...); err != nil {64 lWithMsg.Log("err", err)65 }66}67// With returns a new contextual logger with keyvals prepended to those passed68// to calls to Info, Debug or Error.69func (l *tmLogger) With(keyvals ...interface{}) Logger {70 return &tmLogger{kitlog.With(l.srcLogger, keyvals...)}71}...

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tracing_logger.go

Source:tracing_logger.go Github

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...3 "fmt"4 "github.com/pkg/errors"5)6// NewTracingLogger enables tracing by wrapping all errors (if they7// implement stackTracer interface) in tracedError.8//9// All errors returned by https://github.com/pkg/errors implement stackTracer10// interface.11//12// For debugging purposes only as it doubles the amount of allocations.13func NewTracingLogger(next Logger) Logger {14 return &tracingLogger{15 next: next,16 }17}18type stackTracer interface {19 error20 StackTrace() errors.StackTrace21}22type tracingLogger struct {23 next Logger24}25func (l *tracingLogger) Info(msg string, keyvals ...interface{}) {26 l.next.Info(msg, formatErrors(keyvals)...)27}28func (l *tracingLogger) Debug(msg string, keyvals ...interface{}) {29 l.next.Debug(msg, formatErrors(keyvals)...)30}31func (l *tracingLogger) Error(msg string, keyvals ...interface{}) {32 l.next.Error(msg, formatErrors(keyvals)...)33}34func (l *tracingLogger) With(keyvals ...interface{}) Logger {35 return &tracingLogger{next: l.next.With(formatErrors(keyvals)...)}36}37func formatErrors(keyvals []interface{}) []interface{} {38 newKeyvals := make([]interface{}, len(keyvals))39 copy(newKeyvals, keyvals)40 for i := 0; i < len(newKeyvals)-1; i += 2 {41 if err, ok := newKeyvals[i+1].(stackTracer); ok {42 newKeyvals[i+1] = tracedError{err}43 }44 }45 return newKeyvals46}47// tracedError wraps a stackTracer and just makes the Error() result48// always return a full stack trace.49type tracedError struct {50 wrapped stackTracer51}52var _ stackTracer = tracedError{}53func (t tracedError) StackTrace() errors.StackTrace {54 return t.wrapped.StackTrace()55}56func (t tracedError) Cause() error {57 return t.wrapped58}59func (t tracedError) Error() string {60 return fmt.Sprintf("%+v", t.wrapped)61}...

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Error

Using AI Code Generation

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1import (2func main() {3 f, err := os.Create("error.log")4 if err != nil {5 log.Fatal(err)6 }7 log.SetOutput(f)8 log.SetFlags(log.LstdFlags | log.Lshortfile)9 log.Println("This is a normal message")10 log.Fatalln("This is a fatal message")11 log.Panicln("This is a panic message")12}13import (14func main() {15 f, err := os.Create("fatal.log")16 if err != nil {17 log.Fatal(err)18 }19 log.SetOutput(f)20 log.SetFlags(log.LstdFlags | log.Lshortfile)21 log.Println("This is a normal message")22 log.Fatalln("This is a fatal message")23 log.Panicln("This is a panic message")24}25import (26func main() {27 f, err := os.Create("panic.log")28 if err != nil {29 log.Fatal(err)30 }31 log.SetOutput(f)32 log.SetFlags(log.LstdFlags | log.Lshortfile)33 log.Println("This is a normal message")34 log.Fatalln("This is a fatal message")35 log.Panicln("This is a panic message")36}

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Error

Using AI Code Generation

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1import (2func main() {3 logFile, err := os.OpenFile("logFile.txt", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)4 if err != nil {5 log.Fatalln("failed to open error log file:", err)6 }7 defer logFile.Close()8 logger := log.New(logFile, "logger: ", log.Lshortfile)9 logger.Println("This is a regular message.")10 logger.Fatalln("This is a fatal error.")11}

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Error

Using AI Code Generation

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1log.Error("Error message")2log.Info("Info message")3log.Debug("Debug message")4log.Warn("Warn message")5log.Fatal("Fatal message")6log.Panic("Panic message")7log.Print("Print message")8log.Panic(0xc42000c0b0, 0x1, 0x1)9main.main()10runtime.goexit()

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Error

Using AI Code Generation

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1import (2func main() {3 f, err := os.Create("test.log")4 if err != nil {5 log.Fatal(err)6 }7 defer f.Close()8 logger := log.New(f, "logger: ", log.Lshortfile)9 logger.Print("This is a regular message.")10 logger.Error("This is an error message.")11}12import (13func main() {14 f, err := os.Create("test.log")15 if err != nil {16 log.Fatal(err)17 }18 defer f.Close()19 logger := log.New(f, "logger: ", log.Lshortfile)20 logger.Print("This is a regular message.")21 logger.Fatal("This is an error message.")22}23import (24func main() {25 f, err := os.Create("test.log")26 if err != nil {27 log.Fatal(err)28 }29 defer f.Close()30 logger := log.New(f, "logger: ", log.Lshortfile)31 logger.Print("This is a regular message.")32 logger.Panic("This is an error message.")33}

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Error

Using AI Code Generation

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1import (2func main() {3 file, err := os.Open("test.txt")4 if err != nil {5 log.Fatal("Error in opening file", err)6 }7 defer file.Close()8}9import (10func main() {11 file, err := os.Open("test.txt")12 if err != nil {13 log.Fatalf("Error in opening file %s", err)14 }15 defer file.Close()16}17import (18func main() {19 file, err := os.Open("test.txt")20 if err != nil {21 log.Fatalln("Error in opening file", err)22 }23 defer file.Close()24}25import (26func main() {27 file, err := os.Open("test.txt")28 if err != nil {29 log.Fatal("Error in opening file", err)30 }31 defer file.Close()32}33import (34func main() {35 file, err := os.Open("test.txt")36 if err != nil {37 log.Fatalf("Error in opening file %s", err)38 }39 defer file.Close()40}

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