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45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
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package logrus
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// The Formatter interface is used to implement a custom Formatter. It takes an
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// `Entry`. It exposes all the fields, including the default ones:
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//
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// * `entry.Data["msg"]`. The message passed from Info, Warn, Error ..
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// * `entry.Data["time"]`. The timestamp.
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// * `entry.Data["level"]. The level the entry was logged at.
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//
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// Any additional fields added with `WithField` or `WithFields` are also in
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// `entry.Data`. Format is expected to return an array of bytes which are then
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// logged to `logger.Out`.
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type Formatter interface {
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Format(*Entry) ([]byte, error)
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}
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// This is to not silently overwrite `time`, `msg` and `level` fields when
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// dumping it. If this code wasn't there doing:
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//
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// logrus.WithField("level", 1).Info("hello")
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//
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// Would just silently drop the user provided level. Instead with this code
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// it'll logged as:
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//
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// {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."}
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//
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// It's not exported because it's still using Data in an opinionated way. It's to
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// avoid code duplication between the two default formatters.
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func prefixFieldClashes(data Fields) {
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_, ok := data["time"]
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if ok {
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data["fields.time"] = data["time"]
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}
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_, ok = data["msg"]
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if ok {
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data["fields.msg"] = data["msg"]
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}
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_, ok = data["level"]
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if ok {
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data["fields.level"] = data["level"]
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}
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}
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