This example uses command-line flags to demonstrate various outputs depending on the chosen log level.
()
| 133 | // This example uses command-line flags to demonstrate various outputs |
| 134 | // depending on the chosen log level. |
| 135 | func Example() { |
| 136 | setup() |
| 137 | debug := flag.Bool("debug", false, "sets log level to debug") |
| 138 | |
| 139 | flag.Parse() |
| 140 | |
| 141 | // Default level for this example is info, unless debug flag is present |
| 142 | zerolog.SetGlobalLevel(zerolog.InfoLevel) |
| 143 | if *debug { |
| 144 | zerolog.SetGlobalLevel(zerolog.DebugLevel) |
| 145 | } |
| 146 | |
| 147 | log.Debug().Msg("This message appears only when log level set to Debug") |
| 148 | log.Info().Msg("This message appears when log level set to Debug or Info") |
| 149 | |
| 150 | if e := log.Debug(); e.Enabled() { |
| 151 | // Compute log output only if enabled. |
| 152 | value := "bar" |
| 153 | e.Str("foo", value).Msg("some debug message") |
| 154 | } |
| 155 | |
| 156 | // Output: {"level":"info","time":1199811905,"message":"This message appears when log level set to Debug or Info"} |
| 157 | } |
| 158 | |
| 159 | // Example of using the Output function in the log package to change the output destination |
| 160 | func ExampleOutput() { |