34 lines
1.4 KiB
Go
34 lines
1.4 KiB
Go
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// Package level implements leveled logging on top of Go kit's log package. To
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// use the level package, create a logger as per normal in your func main, and
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// wrap it with level.NewFilter.
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//
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// var logger log.Logger
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// logger = log.NewLogfmtLogger(os.Stderr)
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// logger = level.NewFilter(logger, level.AllowInfo()) // <--
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// logger = log.With(logger, "ts", log.DefaultTimestampUTC)
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//
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// It's also possible to configure log level from a string. For instance from
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// a flag, environment variable or configuration file.
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//
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// fs := flag.NewFlagSet("myprogram")
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// lvl := fs.String("log", "info", "debug, info, warn, error")
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//
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// var logger log.Logger
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// logger = log.NewLogfmtLogger(os.Stderr)
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// logger = level.NewFilter(logger, level.Allow(level.ParseDefault(*lvl, level.InfoValue()))) // <--
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// logger = log.With(logger, "ts", log.DefaultTimestampUTC)
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//
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// Then, at the callsites, use one of the level.Debug, Info, Warn, or Error
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// helper methods to emit leveled log events.
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//
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// logger.Log("foo", "bar") // as normal, no level
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// level.Debug(logger).Log("request_id", reqID, "trace_data", trace.Get())
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// if value > 100 {
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// level.Error(logger).Log("value", value)
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// }
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//
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// NewFilter allows precise control over what happens when a log event is
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// emitted without a level key, or if a squelched level is used. Check the
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// Option functions for details.
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package level
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