/
stacktrace.go
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/
stacktrace.go
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// Copyright 2023 Cisco Systems, Inc. and its affiliates
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package log
import "runtime"
type Stacktracer func() (frames []*runtime.Frame, fallback interface{})
// RuntimeStacktracer find stacktrace frames with runtime package
// skip: skip certain number of stacks from the top, including the call to the Stacktracer itself
// depth: max number of stack frames to extract
func RuntimeStacktracer(skip int, depth int) Stacktracer {
return func() (frames []*runtime.Frame, fallback interface{}) {
rpc := make([]uintptr, depth)
count := runtime.Callers(skip, rpc)
rawFrames := runtime.CallersFrames(rpc)
frames = make([]*runtime.Frame, count)
for i := 0; i < count; i++ {
frame, more := rawFrames.Next()
frames[i] = &frame
if !more {
break
}
}
return frames, nil
}
}
// RuntimeCaller equivalent to RuntimeStacktracer(skip, 1)
func RuntimeCaller(skip int) Stacktracer {
return RuntimeStacktracer(skip, 1)
}