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stacktracer.go
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stacktracer.go
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// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package log
import (
"context"
"github.com/google/gapid/core/context/keys"
)
// Stacktracer is the interface that controls when a stacktrace is taken.
type Stacktracer interface {
ShouldStacktrace(m *Message) bool
}
type stacktracerKeyTy string
const stacktracerKey stacktracerKeyTy = "log.tagStacktracer"
// PutStacktracer returns a new context with the Stacktracer assigned to w.
func PutStacktracer(ctx context.Context, s Stacktracer) context.Context {
return keys.WithValue(ctx, stacktracerKey, s)
}
// GetStacktracer returns the Stacktracer assigned to ctx.
func GetStacktracer(ctx context.Context) Stacktracer {
out, _ := ctx.Value(stacktracerKey).(Stacktracer)
return out
}
// SeverityStacktracer implements the Stacktracer interface which adds a
// stacktrace to messages equal to or more than the severity level.
type SeverityStacktracer Severity
// ShouldStacktrace returns true if the message of severity s should include a
// stacktrace.
func (s SeverityStacktracer) ShouldStacktrace(m *Message) bool { return Severity(s) >= m.Severity }