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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package severity
import (
"context"
"fmt"
"golang.org/x/exp/event"
)
// Level represents a severity level of an event.
// The basic severity levels are designed to match the levels used in open telemetry.
// Smaller numerical values correspond to less severe events (such as debug events),
// larger numerical values correspond to more severe events (such as errors and critical events).
//
// The following table defines the meaning severity levels:
// 1-4 TRACE A fine-grained debugging event. Typically disabled in default configurations.
// 5-8 DEBUG A debugging event.
// 9-12 INFO An informational event. Indicates that an event happened.
// 13-16 WARN A warning event. Not an error but is likely more important than an informational event.
// 17-20 ERROR An error event. Something went wrong.
// 21-24 FATAL A fatal error such as application or system crash.
//
// See https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#severity-fields
// for more details
type Level uint64
const (
Trace = Level(1)
Debug = Level(5)
Info = Level(9)
Warning = Level(13)
Error = Level(17)
Fatal = Level(21)
Max = Level(24)
)
const Key = "level"
// Of creates a label for the level.
func (l Level) Label() event.Label {
return event.Value(Key, l)
}
// From can be used to get a value from a Label.
func From(t event.Label) Level {
return t.Interface().(Level)
}
func (l Level) Log(ctx context.Context, msg string, labels ...event.Label) {
ev := event.New(ctx, event.LogKind)
if ev != nil {
ev.Labels = append(ev.Labels, l.Label())
ev.Labels = append(ev.Labels, labels...)
ev.Labels = append(ev.Labels, event.String("msg", msg))
ev.Deliver()
}
}
func (l Level) Logf(ctx context.Context, msg string, args ...interface{}) {
ev := event.New(ctx, event.LogKind)
if ev != nil {
ev.Labels = append(ev.Labels, l.Label())
ev.Labels = append(ev.Labels, event.String("msg", fmt.Sprintf(msg, args...)))
ev.Deliver()
}
}
func (l Level) Class() Level {
switch {
case l > Max:
return Max
case l > Fatal:
return Fatal
case l > Error:
return Error
case l > Warning:
return Warning
case l > Debug:
return Debug
case l > Info:
return Info
case l > Trace:
return Trace
default:
return 0
}
}
func (l Level) String() string {
switch l {
case 0:
return "invalid"
case Trace:
return "trace"
case Trace + 1:
return "trace2"
case Trace + 2:
return "trace3"
case Trace + 3:
return "trace4"
case Debug:
return "debug"
case Debug + 1:
return "debug2"
case Debug + 2:
return "debug3"
case Debug + 3:
return "debug4"
case Info:
return "info"
case Info + 1:
return "info2"
case Info + 2:
return "info3"
case Info + 3:
return "info4"
case Warning:
return "warning"
case Warning + 1:
return "warning2"
case Warning + 2:
return "warning3"
case Warning + 3:
return "warning4"
case Error:
return "error"
case Error + 1:
return "error2"
case Error + 2:
return "error3"
case Error + 3:
return "error4"
case Fatal:
return "fatal"
case Fatal + 1:
return "fatal2"
case Fatal + 2:
return "fatal3"
case Fatal + 3:
return "fatal4"
default:
return "invalid"
}
}
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