142 lines
3.6 KiB
Go
142 lines
3.6 KiB
Go
package log_test
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import (
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"errors"
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"flag"
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"os"
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"time"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/log"
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)
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// setup would normally be an init() function, however, there seems
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// to be something awry with the testing framework when we set the
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// global Logger from an init()
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func setup() {
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// UNIX Time is faster and smaller than most timestamps
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// If you set zerolog.TimeFieldFormat to an empty string,
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// logs will write with UNIX time
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zerolog.TimeFieldFormat = ""
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// In order to always output a static time to stdout for these
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// examples to pass, we need to override zerolog.TimestampFunc
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// and log.Logger globals -- you would not normally need to do this
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zerolog.TimestampFunc = func() time.Time {
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return time.Date(2008, 1, 8, 17, 5, 05, 0, time.UTC)
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}
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log.Logger = zerolog.New(os.Stdout).With().Timestamp().Logger()
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}
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// Simple logging example using the Print function in the log package
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// Note that both Print and Printf are at the debug log level by default
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func ExamplePrint() {
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setup()
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log.Print("hello world")
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// Output: {"level":"debug","time":1199811905,"message":"hello world"}
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}
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// Simple logging example using the Printf function in the log package
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func ExamplePrintf() {
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setup()
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log.Printf("hello %s", "world")
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// Output: {"level":"debug","time":1199811905,"message":"hello world"}
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}
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// Example of a log with no particular "level"
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func ExampleLog() {
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setup()
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log.Log().Msg("hello world")
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// Output: {"time":1199811905,"message":"hello world"}
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}
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// Example of a log at a particular "level" (in this case, "debug")
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func ExampleDebug() {
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setup()
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log.Debug().Msg("hello world")
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// Output: {"level":"debug","time":1199811905,"message":"hello world"}
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}
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// Example of a log at a particular "level" (in this case, "info")
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func ExampleInfo() {
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setup()
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log.Info().Msg("hello world")
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// Output: {"level":"info","time":1199811905,"message":"hello world"}
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}
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// Example of a log at a particular "level" (in this case, "warn")
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func ExampleWarn() {
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setup()
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log.Warn().Msg("hello world")
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// Output: {"level":"warn","time":1199811905,"message":"hello world"}
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}
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// Example of a log at a particular "level" (in this case, "error")
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func ExampleError() {
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setup()
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log.Error().Msg("hello world")
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// Output: {"level":"error","time":1199811905,"message":"hello world"}
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}
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// Example of a log at a particular "level" (in this case, "fatal")
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func ExampleFatal() {
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setup()
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err := errors.New("A repo man spends his life getting into tense situations")
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service := "myservice"
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log.Fatal().
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Err(err).
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Str("service", service).
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Msgf("Cannot start %s", service)
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// Outputs: {"level":"fatal","time":1199811905,"error":"A repo man spends his life getting into tense situations","service":"myservice","message":"Cannot start myservice"}
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}
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// TODO: Panic
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// This example uses command-line flags to demonstrate various outputs
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// depending on the chosen log level.
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func Example() {
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setup()
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debug := flag.Bool("debug", false, "sets log level to debug")
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flag.Parse()
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// Default level for this example is info, unless debug flag is present
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zerolog.SetGlobalLevel(zerolog.InfoLevel)
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if *debug {
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zerolog.SetGlobalLevel(zerolog.DebugLevel)
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}
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log.Debug().Msg("This message appears only when log level set to Debug")
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log.Info().Msg("This message appears when log level set to Debug or Info")
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if e := log.Debug(); e.Enabled() {
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// Compute log output only if enabled.
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value := "bar"
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e.Str("foo", value).Msg("some debug message")
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}
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// Output: {"level":"info","time":1199811905,"message":"This message appears when log level set to Debug or Info"}
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}
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// TODO: Output
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// TODO: With
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// TODO: Level
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// TODO: Sample
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// TODO: Hook
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// TODO: WithLevel
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// TODO: Ctx
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