How to use parseArgs method of log Package

Best K6 code snippet using log.parseArgs

command_test.go

Source:command_test.go Github

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...7)8func TestParseArgs(t *testing.T) {9 globalArgs, remainingArgs, err := command.ParseArgs([]string{"test-command", "1", "2", "3"})10 if err != nil {11 log.Fatalln("unexpected error from parseArgs:", err)12 }13 if globalArgs.Command != "test-command" {14 log.Fatalln("expecting test-command command, got:", globalArgs.Command)15 }16 if !reflect.DeepEqual(remainingArgs, []string{"1", "2", "3"}) {17 log.Fatalln("unexpected remaining args:", remainingArgs)18 }19}20func TestParseArgsEmpty(t *testing.T) {21 globalArgs, remainingArgs, err := command.ParseArgs([]string{})22 if err != nil {23 log.Fatalln("unexpected error from parseArgs:", err)24 }25 if globalArgs.Command != "" {26 log.Fatalln("expecting empty test-command command, got:", globalArgs.Command)27 }28 if !reflect.DeepEqual(remainingArgs, []string{}) {29 log.Fatalln("expected empty remaining args, got:", remainingArgs)30 }31}32func TestParseArgsCommandOnly(t *testing.T) {33 globalArgs, remainingArgs, err := command.ParseArgs([]string{"test-command"})34 if err != nil {35 log.Fatalln("unexpected error from parseArgs:", err)36 }37 if globalArgs.Quiet {38 log.Fatalln("expected quiet to default to false")39 }40 if globalArgs.Command != "test-command" {41 log.Fatalln("expecting empty test-command command, got:", globalArgs.Command)42 }43 if !reflect.DeepEqual(remainingArgs, []string{}) {44 log.Fatalln("expected empty remaining args, got:", remainingArgs)45 }46}47func TestParseArgsQuietShort(t *testing.T) {48 globalArgs, remainingArgs, err := command.ParseArgs([]string{"-q", "test-command", "1", "2"})49 if err != nil {50 log.Fatalln("unexpected error from parseArgs:", err)51 }52 if globalArgs.Command != "test-command" {53 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)54 }55 if !globalArgs.Quiet {56 log.Fatalln("expecting quiet to be true")57 }58 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {59 log.Fatalln("unexpected remaining args after component arg, got:", remainingArgs)60 }61}62func TestParseArgsQuietLong(t *testing.T) {63 globalArgs, remainingArgs, err := command.ParseArgs([]string{"--quiet", "test-command", "1", "2"})64 if err != nil {65 log.Fatalln("unexpected error from parseArgs:", err)66 }67 if globalArgs.Command != "test-command" {68 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)69 }70 if !globalArgs.Quiet {71 log.Fatalln("expecting quiet to be true")72 }73 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {74 log.Fatalln("unexpected remaining args after component arg, got:", remainingArgs)75 }76}77func TestParseArgsComponentShort(t *testing.T) {78 globalArgs, remainingArgs, err := command.ParseArgs([]string{"-c", "test-component", "test-command", "1", "2"})79 if err != nil {80 log.Fatalln("unexpected error from parseArgs:", err)81 }82 if globalArgs.Command != "test-command" {83 log.Fatalln("expecting test-command command after short component, got:", globalArgs.Command)84 }85 if globalArgs.Component != "test-component" {86 log.Fatalln("expecting test-component from short arg, got:", globalArgs.Command)87 }88 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {89 log.Fatalln("unexpected remaining args after short component arg, got:", remainingArgs)90 }91}92func TestParseArgsComponentLong(t *testing.T) {93 globalArgs, remainingArgs, err := command.ParseArgs([]string{"--component", "test-component", "test-command", "1", "2"})94 if err != nil {95 log.Fatalln("unexpected error from parseArgs:", err)96 }97 if globalArgs.Command != "test-command" {98 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)99 }100 if globalArgs.Component != "test-component" {101 log.Fatalln("expecting test-component from short arg, got:", globalArgs.Component)102 }103 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {104 log.Fatalln("unexpected remaining args after component arg, got:", remainingArgs)105 }106}107func TestParseArgsComponentLongWithEquals(t *testing.T) {108 globalArgs, remainingArgs, err := command.ParseArgs([]string{"--component=test-component", "test-command", "1", "2"})109 if err != nil {110 log.Fatalln("unexpected error from parseArgs:", err)111 }112 if globalArgs.Command != "test-command" {113 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)114 }115 if globalArgs.Component != "test-component" {116 log.Fatalln("expecting test-component from short arg, got:", globalArgs.Component)117 }118 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {119 log.Fatalln("unexpected remaining args after component arg, got:", remainingArgs)120 }121}122func TestParseArgsCommitLong(t *testing.T) {123 globalArgs, remainingArgs, err := command.ParseArgs([]string{"--commit", "test-commit", "test-command", "1", "2"})124 if err != nil {125 log.Fatalln("unexpected error from parseArgs:", err)126 }127 if globalArgs.Command != "test-command" {128 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)129 }130 if globalArgs.Commit != "test-commit" {131 log.Fatalln("expecting test-commit from short arg, got:", globalArgs.Commit)132 }133 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {134 log.Fatalln("unexpected remaining args after commit arg, got:", remainingArgs)135 }136}137func TestParseArgsCommitLongWithPrefix(t *testing.T) {138 globalArgs, remainingArgs, err := command.ParseArgs([]string{"--commit=test-commit", "test-command", "1", "2"})139 if err != nil {140 log.Fatalln("unexpected error from parseArgs:", err)141 }142 if globalArgs.Command != "test-command" {143 log.Fatalln("expecting test-command command after long component, got:", globalArgs.Command)144 }145 if globalArgs.Commit != "test-commit" {146 log.Fatalln("expecting test-commit from short arg, got:", globalArgs.Commit)147 }148 if !reflect.DeepEqual(remainingArgs, []string{"1", "2"}) {149 log.Fatalln("unexpected remaining args after commit arg, got:", remainingArgs)150 }151}152func TestParseArgsVersion(t *testing.T) {153 globalArgs, _, err := command.ParseArgs([]string{"--version"})154 if err != nil {155 log.Fatalln("unexpected error from parseArgs:", err)156 }157 if globalArgs.Command != "version" {158 log.Fatalln("expected command to be version, got:", globalArgs.Command)159 }160}161func TestGetComponentFromGit(t *testing.T) {162 component, err := command.GetComponentFromGit()163 if err != nil {164 log.Fatalln("error getting component name from git:", err)165 }166 if component != "cdflow2" {167 log.Fatalln("expected cdflow2 component from git, got:", component)168 }169}...

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config.go

Source:config.go Github

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1package psdock2import (3 "errors"4 "flag"5 "github.com/BurntSushi/toml"6 "os"7 "os/user"8)9//command is the name of the command to be executed by psdock10//Config contains the result of command-line-Config parsing.11//args are the Config passed to this command12//stdout is the redirection path for the stdout/stderr of the launched process13//logRotation is the lifetime (in seconds) of a single log file14//logPrefix is the prefix for logging the output of the launched process15//bindPort is the port watched for binding by psdock16//webHook is the hook triggered by psdock in case of special events17//user is the UID of the user launching the process18type Config struct {19 Command string20 Stdout string21 LogRotation string22 LogPrefix string23 LogColor string24 EnvVars string25 BindPort int26 WebHook string27 Stdin string28 UserName string29 Gateway string30}31//ParseArgs parses command-line Config and returns them in an Config struct32func ParseArgs() (*Config, error) {33 parsedConfig := Config{}34 var tomlConfigFilename string35 flag.StringVar(&parsedConfig.Command, "command", "", "command to be executed by psdock")36 flag.StringVar(&parsedConfig.Stdout, "stdout", "os.Stdout", "redirection path for the stdout/stderr of the launched process")37 flag.StringVar(&parsedConfig.LogRotation, "log-rotation", "daily", "lifetime of a single log file.")38 flag.StringVar(&parsedConfig.LogPrefix, "log-prefix", "", "prefix for logging the output of the launched process")39 flag.StringVar(&parsedConfig.LogColor, "log-prefix-color", "black", "color for logging the output of the launched process")40 flag.StringVar(&parsedConfig.EnvVars, "env-vars", "", "Config passed to the launched command")41 flag.IntVar(&parsedConfig.BindPort, "bind-port", 0, "port to be watched for binding by psdock (0 means no port is monitored)")42 flag.StringVar(&parsedConfig.WebHook, "web-hook", "", "hook triggered by psdock in case of special events")43 flag.StringVar(&parsedConfig.Stdin, "stdin", "os.Stdin", "url used to read stdin")44 flag.StringVar(&tomlConfigFilename, "c", "", "filename of the toml file used to read the config")45 flag.StringVar(&parsedConfig.Gateway, "gateway", "", "gateway used to access the network : applicable only if psdock is used as /sbin/init")46 //Retrieve the name of the current user. Will be used as a default value for user-name47 user, err := user.Current()48 if err != nil {49 return nil, errors.New("Error in ParseArgs():Failed to retrieve the informations about the current user!\n" + err.Error())50 }51 flag.StringVar(&parsedConfig.UserName, "user-name", user.Username, "name of the user launching the process")52 flag.Parse()53 if tomlConfigFilename != "" {54 if len(os.Args) != 3 {55 flag.PrintDefaults()56 return nil, errors.New("Error in ParseArgs():If a toml config file is given, you can't specify other arguments!")57 }58 err := parseTOML(&parsedConfig, tomlConfigFilename)59 if err != nil {60 return nil, errors.New("Error in ParseArgs():Can't parse TOML file:" + err.Error())61 }62 }63 //We haven't specified a file with the -c command. Let's still try to open PSDOCK_CFG_FILEPATH64 if len(os.Args) == 1 {65 if _, err = os.Stat(PSDOCK_CFG_FILEPATH); err == nil {66 err = parseTOML(&parsedConfig, PSDOCK_CFG_FILEPATH)67 if err != nil {68 return nil, errors.New("Error in ParseArgs():Can't parse TOML file:" + err.Error())69 }70 }71 }72 //The user has to specify a process to run73 if parsedConfig.Command == "" {74 flag.PrintDefaults()75 return nil, errors.New("Error in ParseArgs():You must specify a process to run")76 }77 if parsedConfig.LogRotation != "minutely" && parsedConfig.LogRotation != "hourly" &&78 parsedConfig.LogRotation != "daily" && parsedConfig.LogRotation != "weekly" {79 flag.PrintDefaults()80 return nil, errors.New("Error in ParseArgs():log-rotation has to be minutely, hourly, daily or weekly !")81 }82 if parsedConfig.LogColor != "black" && parsedConfig.LogColor != "white" &&83 parsedConfig.LogColor != "red" && parsedConfig.LogColor != "green" &&84 parsedConfig.LogColor != "blue" && parsedConfig.LogColor != "yellow" &&85 parsedConfig.LogColor != "magenta" && parsedConfig.LogColor != "cyan" {86 flag.PrintDefaults()87 return nil, errors.New("Error in ParseArgs():log-prefix-color has to be black, white, red, green, blue, yellow, cyan or magenta !")88 }89 if parsedConfig.BindPort > 0 && parsedConfig.WebHook == "" {90 flag.PrintDefaults()91 return nil, errors.New("Error in ParseArgs():If you specify a port, you have to specify a http hook !")92 }93 if parsedConfig.BindPort < 0 {94 flag.PrintDefaults()95 return nil, errors.New("Error in ParseArgs():bind-port can't be negative!")96 }97 return &parsedConfig, nil98}99//parseTOML parses a toml file and fills conf100func parseTOML(conf *Config, filename string) error {101 if _, err := toml.DecodeFile(filename, conf); err != nil {102 return err103 }104 return nil105}...

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parseargs.go

Source:parseargs.go Github

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1package services2import (3 "errors"4 "fmt"5 "io/ioutil"6 "log"7 "os"8 "regexp"9 "strconv"10 "strings"11 "time"12)13var timePattern = regexp.MustCompile(`^(\d+)(ms|[smh])?$`)14var patternHeader = regexp.MustCompile(`^([a-zA-Z0-9\-_]+?)\s*?\:\s*?([a-zA-Z].+)$`)15type ParseArgs struct {16}17func (parser ParseArgs) GetTimeDuration(rawElapsed string) (time.Duration, error) {18 matches := timePattern.FindAllSubmatch([]byte(rawElapsed), 1)19 var duration time.Duration20 var err error21 if len(matches) <= 0 {22 return time.Duration(0), errors.New("ERROR: input a valid format [digit+(ms|s|m|h)?]")23 }24 matchTime := matches[0]25 rawConstant := matchTime[1]26 rawUnit := matchTime[2]27 constant, _ := strconv.Atoi(string(rawConstant))28 switch string(rawUnit) {29 case "h":30 duration = time.Duration(constant) * time.Hour31 case "m":32 duration = time.Duration(constant) * time.Minute33 case "s":34 duration = time.Duration(constant) * time.Second35 case "", "ms":36 duration = time.Duration(constant) * time.Millisecond37 default:38 err = errors.New("ERROR: unit time not recognized you should use (ms|s|m|h)")39 }40 return duration, err41}42func (parser ParseArgs) ParsePayload(input string) ([]byte, error) {43 if input == "" {44 return nil, nil45 }46 var isFile bool47 if input[0:1] == "@" {48 isFile = true49 }50 if isFile {51 filePath := input[1:]52 return os.ReadFile(filePath)53 }54 return []byte(input), nil55}56func (parser ParseArgs) GetMehod(inputMethod string) (string, error) {57 if inputMethod == "" {58 return "", errors.New("ERROR: request method can not be empty")59 }60 input := strings.ToUpper(inputMethod)61 switch input {62 case "GET", "HEAD", "POST", "PUT", "DELETE", "CONNECT", "OPTIONS", "TRACE", "PATCH":63 return input, nil64 default:65 return input, fmt.Errorf("ERROR: unrecognized request method [%s]", inputMethod)66 }67}68func (parser ParseArgs) GetHeaders(inputHeaders ...string) (map[string]string, error) {69 headers := make(map[string]string)70 for _, inputHeader := range inputHeaders {71 if inputHeader == "" {72 continue73 }74 if patternHeader.Match([]byte(inputHeader)) {75 matches := patternHeader.FindAllSubmatch([]byte(inputHeader), 1)76 headers[string(matches[0][1])] = string(matches[0][2])77 } else {78 return headers, fmt.Errorf("ERROR: format header malformed \"Header: Value\", [%s]", inputHeader)79 }80 }81 return headers, nil82}83func (parser ParseArgs) GetHttpResponseLogger(logOutput string, concurrency int) (*log.Logger, error) {84 if (concurrency > 0 && logOutput == "") || logOutput == "/dev/null" {85 logDefault := log.New(os.Stderr, "", log.LstdFlags)86 logDefault.SetOutput(ioutil.Discard)87 return logDefault, nil88 }89 if logOutput == "" || logOutput == "std" {90 logDefault := log.New(os.Stderr, "", log.LstdFlags)91 return logDefault, nil92 }93 file, err := os.OpenFile(logOutput, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)94 if err != nil {95 return nil, err96 }97 logger := log.New(file, "", log.Ldate|log.Ltime)98 return logger, nil99}...

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parseArgs

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1import (2func main() {3 log.SetFlags(0)4 log.SetPrefix("TRACE: ")5 log.Println("I have something standard to say")6 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)7 log.Println("I have something else to say")8}9import (10func main() {11 f, err := os.OpenFile("logfile.txt", os.O_WRONLY|os.O_CREATE, 0644)12 if err != nil {13 fmt.Println(err)14 }15 defer f.Close()16 log.SetOutput(f)17 log.Println("Hello, playground")18}19import (20func main() {21 _, err := os.Open("filename.ext")22 if err != nil {23 log.Fatal(err)24 }25}26import (27func main() {28 _, err := os.Open("filename.ext")29 if err != nil {30 log.Panic(err)31 }32}33import (34func main() {35 f, err := os.OpenFile("logfile.txt", os.O_WRONLY|os.O_CREATE, 0644)36 if err != nil {37 fmt.Println(err)38 }39 defer f.Close()40 log.SetOutput(f)

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1import (2func main() {3 log.Println("Println")4 log.Printf("Printf %s", "Printf")5 log.Fatalln("Fatalln")6 log.Fatalf("Fatalf %s", "Fatalf")7 log.Panicln("Panicln")8 log.Panicf("Panicf %s", "Panicf")9 fmt.Println("Hello, playground")10}11import (12func main() {13 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)14 log.Println("Println")15 log.Printf("Printf %s", "Printf")16 log.Fatalln("Fatalln")17 log.Fatalf("Fatalf %s", "Fatalf")18 log.Panicln("Panicln")19 log.Panicf("Panicf %s", "Panicf")20 fmt.Println("Hello, playground")21}22import (23func main() {24 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)25 log.Println("Println")26 log.Printf("Printf %s", "Printf")27 log.Fatalln("Fatalln")28 log.Fatalf("Fatalf %s", "Fatalf")29 log.Panicln("Panicln")30 log.Panicf("Panicf %s", "Panicf")31 fmt.Println("Hello, playground")32}33import (34func main() {35 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)36 log.SetPrefix("MyLog: ")37 log.Println("Println")38 log.Printf("Printf %s", "Printf")39 log.Fatalln("Fatalln")40 log.Fatalf("Fatalf %s", "Fatalf")41 log.Panicln("Panicln")42 log.Panicf("Panicf %s", "Panicf")43 fmt.Println("Hello, playground")44}

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parseArgs

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1import (2func main() {3 log.SetFlags(0)4 log.SetPrefix("logger: ")5 log.SetOutput(os.Stdout)6 log.Print("this is a log message")7}8How to use Fatalf() method of log class9Syntax: log.Fatalf(format, args...)10import (11func main() {12 log.SetFlags(0)13 log.SetPrefix("logger: ")14 log.SetOutput(os.Stdout)15 log.Fatalf("this is a log message")16}17How to use Fatalln() method of log class18Syntax: log.Fatalln(args...)19import (20func main() {21 log.SetFlags(0)22 log.SetPrefix("logger: ")23 log.SetOutput(os.Stdout)24 log.Fatalln("this is a log message")25}26How to use Flags() method of log class27Syntax: log.Flags() int28import (29func main() {30 log.SetFlags(0)31 log.SetPrefix("logger: ")32 log.SetOutput(os.Stdout)33 fmt.Println(log.Flags())34}35How to use Output() method of log

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parseArgs

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1import (2func main() {3 log.SetPrefix("TRACE: ")4 log.SetFlags(log.Ldate | log.Ltime)5 f, err := os.Create("log.txt")6 if err != nil {7 log.Fatal(err)8 }9 log.SetOutput(f)10 log.Println("message")11 log.Fatalln("fatal message")12 log.Panicln("panic message")13}14log.Panicln(0xc000092058, 0x1, 0x1)15main.main()16GoLang | os.Exit() function17GoLang | os.Setenv() function18GoLang | os.Getenv() function19GoLang | os.LookupEnv() function20GoLang | os.Hostname() function21GoLang | os.TempDir() function22GoLang | os.Getwd() function23GoLang | os.Chdir() function24GoLang | os.Chmod() function25GoLang | os.Chown() function26GoLang | os.Chroot() function27GoLang | os.Create() function28GoLang | os.Open() function29GoLang | os.OpenFile() function30GoLang | os.ReadDir() function31GoLang | os.Readlink() function32GoLang | os.Remove() function33GoLang | os.RemoveAll() function34GoLang | os.Rename() function

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parseArgs

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1import (2func main() {3 log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)4 log.Println("message")5 log.SetOutput(os.Stdout)6 log.Println("message")7 log.SetPrefix("prefix")8 log.Println("message")9 log.SetOutput(os.Stderr)10 log.Println("message")11 log.SetPrefix("")12 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Llongfile)13 log.Println("message")14 log.SetOutput(os.Stdout)15 log.Println("message")16 log.SetPrefix("prefix")17 log.Println("message")18 log.SetOutput(os.Stderr)19 log.Println("message")20 log.SetPrefix("")21 log.SetFlags(log.Ldate | log.Ltime)22 log.Println("message")23 log.SetOutput(os.Stdout)24 log.Println("message")25 log.SetPrefix("prefix")26 log.Println("message")27 log.SetOutput(os.Stderr)28 log.Println("message")29 log.SetPrefix("")30 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)31 log.Println("message")32 log.SetOutput(os.Stdout)33 log.Println("message")34 log.SetPrefix("prefix")35 log.Println("message")36 log.SetOutput(os.Stderr)37 log.Println("message")38 log.SetPrefix("")39 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Lshortfile)40 log.Println("message")41 log.SetOutput(os.Stdout)42 log.Println("message")43 log.SetPrefix("prefix")44 log.Println("message")45 log.SetOutput(os.Stderr)46 log.Println("message")47 log.SetPrefix("")48 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Llongfile | log.LUTC)49 log.Println("message")50 log.SetOutput(os.Stdout)51 log.Println("message")52 log.SetPrefix("prefix")53 log.Println("message")54 log.SetOutput(os.Stderr)55 log.Println("message")56 log.SetPrefix("")57 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Lshortfile | log.LUTC)58 log.Println("message")59 log.SetOutput(os.Stdout)60 log.Println("message")61 log.SetPrefix("prefix")62 log.Println("message")63 log.SetOutput(os.Stderr)64 log.Println("message")65 log.SetPrefix("")66 log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Llongfile | log.LUTC)67 log.Println("message")68 log.SetOutput(os.Stdout)69 log.Println("message")70 log.SetPrefix("prefix")71 log.Println("

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1import (2func main() {3 log.SetFlags(0)4 log.SetPrefix("TRACE: ")5 log.Println("message")6 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)7 log.Println("message")8 log.SetOutput(os.Stdout)9 log.Println("message")10 log.SetOutput(os.Stderr)11 log.Println("message")12 log.SetOutput(os.Stderr)13 log.SetFlags(log.LstdFlags | log.Lshortfile)14 log.Println("message")15 log.SetFlags(0)16 log.SetPrefix("TRACE: ")17 log.SetOutput(os.Stdout)18 log.Println("message")19 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)20 log.SetPrefix("TRACE: ")21 log.SetOutput(os.Stdout)22 log.Println("message")23 log.SetFlags(0)24 log.SetPrefix("TRACE: ")25 log.SetOutput(os.Stdout)26 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)27 log.Println("message")28 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)29 log.SetPrefix("TRACE: ")30 log.SetOutput(os.Stdout)31 log.SetFlags(0)32 log.Println("message")33 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)34 log.SetPrefix("TRACE: ")35 log.SetOutput(os.Stdout)36 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Llongfile)37 log.Println("message")38}39Recommended Posts: Golang | log.Fatal() Method40Golang | log.Panic() Method41Golang | log.Panicf() Method42Golang | log.Panicln() Method

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1import (2func main() {3 log.SetFlags(0)4 log.SetPrefix("ERROR: ")5 log.SetOutput(os.Stdout)6 log.Println("This is a log message")7}8GoLang SetFlags() Method9const (10import (11func main() {12 log.SetFlags(log.Ldate | log.Lshortfile)13 log.Println("This is a log message")14}15GoLang SetOutput() Method16import (17func main() {18 log.SetOutput(os.Stdout)19 log.Println("This is a log message")20}21GoLang SetPrefix() Method22SetPrefix() method of log

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1import (2func main() {3 log.ParseArgs()4 log.Println("Hello, playground")5 fmt.Println("Hello, playground")6}

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1log := log.New(os.Stdout, "", 0)2log.ParseArgs(args)3log.Info("Hello, world")4log := log.New(os.Stdout, "", 0)5log.ParseArgs(args)6log.Info("Hello, world")7log := log.New(os.Stdout, "", 0)8log.ParseArgs(args)9log.Info("Hello, world")10log := log.New(os.Stdout, "", 0)11log.ParseArgs(args)12log.Info("Hello, world")13log := log.New(os.Stdout, "", 0)14log.ParseArgs(args)15log.Info("Hello, world")16log := log.New(os.Stdout, "", 0)17log.ParseArgs(args)18log.Info("Hello, world")19log := log.New(os.Stdout, "", 0)20log.ParseArgs(args)21log.Info("Hello, world")22log := log.New(os.Stdout, "", 0)23log.ParseArgs(args)24log.Info("Hello, world")25log := log.New(os.Stdout, "", 0)26log.ParseArgs(args)27log.Info("Hello, world")28log := log.New(os.Stdout, "", 0)29log.ParseArgs(args)30log.Info("Hello, world")31log := log.New(os.Stdout, "", 0)32log.ParseArgs(args)33log.Info("Hello, world")34log := log.New(os.Stdout, "", 0)35log.ParseArgs(args)36log.Info("Hello, world")37log := log.New(os.Stdout

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1import (2func main() {3 log.Println("This is a log message")4 fmt.Println("This is a log message")5}6The log.Writer() function is used to get the output destination for the logger. This function is used

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