package zerolog_test import ( "errors" stdlog "log" "os" "time" "github.com/rs/zerolog" ) func ExampleNew() { log := zerolog.New(os.Stdout) log.Info().Msg("hello world") // Output: {"level":"info","message":"hello world"} } func ExampleLogger_With() { log := zerolog.New(os.Stdout). With(). Str("foo", "bar"). Logger() log.Info().Msg("hello world") // Output: {"level":"info","foo":"bar","message":"hello world"} } func ExampleLogger_Level() { log := zerolog.New(os.Stdout).Level(zerolog.WarnLevel) log.Info().Msg("filtered out message") log.Error().Msg("kept message") // Output: {"level":"error","message":"kept message"} } func ExampleLogger_Sample() { log := zerolog.New(os.Stdout).Sample(&zerolog.BasicSampler{N: 2}) log.Info().Msg("message 1") log.Info().Msg("message 2") log.Info().Msg("message 3") log.Info().Msg("message 4") // Output: {"level":"info","message":"message 2"} // {"level":"info","message":"message 4"} } type LevelNameHook struct{} func (h LevelNameHook) Run(e *zerolog.Event, l zerolog.Level, msg string) { if l != zerolog.NoLevel { e.Str("level_name", l.String()) } else { e.Str("level_name", "NoLevel") } } type MessageHook string func (h MessageHook) Run(e *zerolog.Event, l zerolog.Level, msg string) { e.Str("the_message", msg) } func ExampleLogger_Hook() { var levelNameHook LevelNameHook var messageHook MessageHook = "The message" log := zerolog.New(os.Stdout).Hook(levelNameHook).Hook(messageHook) log.Info().Msg("hello world") // Output: {"level":"info","level_name":"info","the_message":"hello world","message":"hello world"} } func ExampleLogger_Print() { log := zerolog.New(os.Stdout) log.Print("hello world") // Output: {"level":"debug","message":"hello world"} } func ExampleLogger_Printf() { log := zerolog.New(os.Stdout) log.Printf("hello %s", "world") // Output: {"level":"debug","message":"hello world"} } func ExampleLogger_Debug() { log := zerolog.New(os.Stdout) log.Debug(). Str("foo", "bar"). Int("n", 123). Msg("hello world") // Output: {"level":"debug","foo":"bar","n":123,"message":"hello world"} } func ExampleLogger_Info() { log := zerolog.New(os.Stdout) log.Info(). Str("foo", "bar"). Int("n", 123). Msg("hello world") // Output: {"level":"info","foo":"bar","n":123,"message":"hello world"} } func ExampleLogger_Warn() { log := zerolog.New(os.Stdout) log.Warn(). Str("foo", "bar"). Msg("a warning message") // Output: {"level":"warn","foo":"bar","message":"a warning message"} } func ExampleLogger_Error() { log := zerolog.New(os.Stdout) log.Error(). Err(errors.New("some error")). Msg("error doing something") // Output: {"level":"error","error":"some error","message":"error doing something"} } func ExampleLogger_WithLevel() { log := zerolog.New(os.Stdout) log.WithLevel(zerolog.InfoLevel). Msg("hello world") // Output: {"level":"info","message":"hello world"} } func ExampleLogger_Write() { log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Logger() stdlog.SetFlags(0) stdlog.SetOutput(log) stdlog.Print("hello world") // Output: {"foo":"bar","message":"hello world"} } func ExampleLogger_Log() { log := zerolog.New(os.Stdout) log.Log(). Str("foo", "bar"). Str("bar", "baz"). Msg("") // Output: {"foo":"bar","bar":"baz"} } func ExampleEvent_Dict() { log := zerolog.New(os.Stdout) log.Log(). Str("foo", "bar"). Dict("dict", zerolog.Dict(). Str("bar", "baz"). Int("n", 1), ). Msg("hello world") // Output: {"foo":"bar","dict":{"bar":"baz","n":1},"message":"hello world"} } type User struct { Name string Age int Created time.Time } func (u User) MarshalZerologObject(e *zerolog.Event) { e.Str("name", u.Name). Int("age", u.Age). Time("created", u.Created) } type Users []User func (uu Users) MarshalZerologArray(a *zerolog.Array) { for _, u := range uu { a.Object(u) } } func ExampleEvent_Array() { log := zerolog.New(os.Stdout) log.Log(). Str("foo", "bar"). Array("array", zerolog.Arr(). Str("baz"). Int(1), ). Msg("hello world") // Output: {"foo":"bar","array":["baz",1],"message":"hello world"} } func ExampleEvent_Array_object() { log := zerolog.New(os.Stdout) // Users implements zerolog.LogArrayMarshaler u := Users{ User{"John", 35, time.Time{}}, User{"Bob", 55, time.Time{}}, } log.Log(). Str("foo", "bar"). Array("users", u). Msg("hello world") // Output: {"foo":"bar","users":[{"name":"John","age":35,"created":"0001-01-01T00:00:00Z"},{"name":"Bob","age":55,"created":"0001-01-01T00:00:00Z"}],"message":"hello world"} } func ExampleEvent_Object() { log := zerolog.New(os.Stdout) // User implements zerolog.LogObjectMarshaler u := User{"John", 35, time.Time{}} log.Log(). Str("foo", "bar"). Object("user", u). Msg("hello world") // Output: {"foo":"bar","user":{"name":"John","age":35,"created":"0001-01-01T00:00:00Z"},"message":"hello world"} } func ExampleEvent_Interface() { log := zerolog.New(os.Stdout) obj := struct { Name string `json:"name"` }{ Name: "john", } log.Log(). Str("foo", "bar"). Interface("obj", obj). Msg("hello world") // Output: {"foo":"bar","obj":{"name":"john"},"message":"hello world"} } func ExampleEvent_Dur() { d := time.Duration(10 * time.Second) log := zerolog.New(os.Stdout) log.Log(). Str("foo", "bar"). Dur("dur", d). Msg("hello world") // Output: {"foo":"bar","dur":10000,"message":"hello world"} } func ExampleEvent_Durs() { d := []time.Duration{ time.Duration(10 * time.Second), time.Duration(20 * time.Second), } log := zerolog.New(os.Stdout) log.Log(). Str("foo", "bar"). Durs("durs", d). Msg("hello world") // Output: {"foo":"bar","durs":[10000,20000],"message":"hello world"} } func ExampleContext_Dict() { log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Dict("dict", zerolog.Dict(). Str("bar", "baz"). Int("n", 1), ).Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","dict":{"bar":"baz","n":1},"message":"hello world"} } func ExampleContext_Array() { log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Array("array", zerolog.Arr(). Str("baz"). Int(1), ).Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","array":["baz",1],"message":"hello world"} } func ExampleContext_Array_object() { // Users implements zerolog.LogArrayMarshaler u := Users{ User{"John", 35, time.Time{}}, User{"Bob", 55, time.Time{}}, } log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Array("users", u). Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","users":[{"name":"John","age":35,"created":"0001-01-01T00:00:00Z"},{"name":"Bob","age":55,"created":"0001-01-01T00:00:00Z"}],"message":"hello world"} } func ExampleContext_Object() { // User implements zerolog.LogObjectMarshaler u := User{"John", 35, time.Time{}} log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Object("user", u). Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","user":{"name":"John","age":35,"created":"0001-01-01T00:00:00Z"},"message":"hello world"} } func ExampleContext_Interface() { obj := struct { Name string `json:"name"` }{ Name: "john", } log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Interface("obj", obj). Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","obj":{"name":"john"},"message":"hello world"} } func ExampleContext_Dur() { d := time.Duration(10 * time.Second) log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Dur("dur", d). Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","dur":10000,"message":"hello world"} } func ExampleContext_Durs() { d := []time.Duration{ time.Duration(10 * time.Second), time.Duration(20 * time.Second), } log := zerolog.New(os.Stdout).With(). Str("foo", "bar"). Durs("durs", d). Logger() log.Log().Msg("hello world") // Output: {"foo":"bar","durs":[10000,20000],"message":"hello world"} }